WO2021210404A1 - Electrical circuit of injection molding machine - Google Patents
Electrical circuit of injection molding machine Download PDFInfo
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- WO2021210404A1 WO2021210404A1 PCT/JP2021/013949 JP2021013949W WO2021210404A1 WO 2021210404 A1 WO2021210404 A1 WO 2021210404A1 JP 2021013949 W JP2021013949 W JP 2021013949W WO 2021210404 A1 WO2021210404 A1 WO 2021210404A1
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- circuit
- power supply
- voltage
- molding machine
- injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
Definitions
- the present invention relates to an electric circuit of an injection molding machine equipped with a motor.
- Patent Documents 1 to 4 disclose an electric circuit of an injection molding machine including a servomotor.
- the injection molding machine includes an electric circuit that drives and controls a servomotor.
- Patent Document 1 an energy holding circuit composed of a capacitor and a power failure detection circuit are provided, a power failure processing operation that protects the molding machine in the event of a power failure is performed, and an electric circuit of the injection molding machine that safely and normally terminates the operation of the molding machine. Is disclosed.
- Patent Document 2 discloses an electric circuit of an injection molding machine that saves energy and takes measures against a power failure by charging and discharging a smoothing capacitor of an inverter and a charger in combination.
- Patent Document 3 discloses an electric circuit of an injection molding machine that uses a capacitor as a power storage unit and uses a regenerative current accompanying deceleration of the motor to level the electric power required for acceleration control of the motor.
- the rectifier and the driving device are provided with a smoothing capacitor, and the control command value is lowered at the time of power failure detection to reduce the pressure and speed to secure the operation continuation function at the time of power failure.
- the circuit is disclosed.
- Japanese Unexamined Patent Publication No. 2004-216829 Japanese Unexamined Patent Publication No. 2001-232672 Japanese Unexamined Patent Publication No. 2000-141440 Japanese Unexamined Patent Publication No. 2015-100996
- An object of the present invention is to provide an electric circuit of an injection molding machine capable of increasing the frequency with which the injection molding machine can be continued to operate in the event of a momentary power failure.
- the electric circuit of the injection molding machine that solves the above problems is an electric circuit of the injection molding machine having a motor driver that drives and controls the motor, and an AC of a predetermined voltage input from a commercial AC power supply is used to control the motor.
- a motor driver having a conversion circuit for converting voltage and frequency, and a DC power supply circuit for converting AC of a predetermined voltage input from a commercial AC power supply into DC having a control supply voltage lower than the predetermined voltage and outputting the DC power supply circuit.
- the conversion circuit includes a rectifier, a smoothing capacitor, and a switching circuit, and the motor driver and the DC power supply circuit are connected via a bypass circuit including a backflow prevention circuit that allows a current from the smoothing capacitor to the DC power supply circuit. Has been done.
- the current due to the electric charge stored in the smoothing capacitor is supplied from the motor driver to the DC power supply circuit via the bypass circuit including the backflow prevention circuit.
- the DC power supply circuit can supply a predetermined voltage of DC even during a momentary power failure.
- the motor continues to be driven even after the power is restored from the momentary power failure of the commercial AC power supply. Therefore, it is possible to increase the frequency with which the operation of the injection molding machine can be continued by continuing the driving of the motor after the power is restored in the event of a momentary power failure with a simple circuit configuration and without performing special control.
- the electric circuit of the injection molding machine further includes a heater circuit that heats a heater by alternating current supplied from the commercial alternating current power supply common to the DC power supply circuit, and the DC power supply circuit receives alternating current from the commercial alternating current power supply.
- a smoothing circuit that smoothes the rectification to the direct current of the supply voltage may be provided.
- the rectifier circuit of the DC power supply circuit prevents a part of the current supplied from the smoothing capacitor to the DC power supply circuit from flowing to the heater circuit via the DC power supply circuit at the time of a momentary power failure. Therefore, even if a momentary power failure occurs, the motor can be continuously driven, and the frequency of continuing the operation of the injection molding machine can be further increased.
- a second smoothing capacitor may be externally attached to the motor driver in parallel with the smoothing capacitor.
- the electric charge for a plurality of smoothing capacitors is stored in the event of a momentary power failure of the commercial AC power supply, so that the frequency with which the injection molding machine can be continued can be further increased.
- the motor driver controls a plurality of motors
- the conversion circuit includes at least the smoothing capacitor and the switching circuit for each of the plurality of the motors, and the plurality of the smoothing capacitors are provided. It is connected to the DC power supply circuit via the bypass circuit.
- the current due to the electric charges stored in the plurality of smoothing capacitors is supplied to the DC power supply circuit, so that the operation of the injection molding machine can be continued more frequently.
- the DC power supply circuit is one of M DC power supply circuits (where M is a natural number of 2 or more), and the conversion circuit is among N conversion circuits. (However, N is a natural number of 2 or more), the N smoothing capacitors are connected to the M DC power supply circuits via the bypass circuit, and the N are the M. May be more.
- the current due to the electric charge stored in the N smoothing capacitors is supplied to the M DC power supply circuits, which are less than N, so that the injection molding machine can be operated.
- the frequency with which you can continue is even higher.
- an electric circuit of an injection molding machine capable of increasing the frequency with which the operation of the injection molding machine can be continued in the event of a momentary power failure with a simple circuit configuration.
- the schematic diagram which shows the injection molding machine in 1st Embodiment The block diagram which shows the electric circuit of an injection molding machine.
- the electro-hydraulic injection molding machine 10 is driven by hydraulic oil supplied by driving a hydraulic pump 34 by a servomotor 36.
- the injection molding machine 10 includes an injection device 11 and a mold clamping device 12.
- the injection device 11 includes a heating cylinder 21, a screw 22 inserted inside the heating cylinder 21, and a screw driving unit 23 arranged at the rear end of the heating cylinder 21 to drive the screw 22.
- the heating cylinder 21 includes an injection nozzle 21n provided at the front end of the heating cylinder 21 and a hopper 21h provided at the rear portion of the heating cylinder 21.
- the screw drive unit 23 includes an injection cylinder (hydraulic cylinder) 24 containing a single rod type injection ram 24a. The ram rod 24b projecting forward of the injection cylinder 24 is coupled to the rear end of the screw 22.
- a shaft of a metering motor (oil motor) 25 attached to the injection cylinder 24 is spline-coupled to the rear end of the injection ram 24a.
- the injection device 11 includes a moving cylinder 26 below the injection device 11 that moves the injection device 11 forward and backward to touch or release the nozzle on the mold 15. Further, a plurality of heaters 27 are attached to the outer peripheral surface of the heating cylinder 21 in a wound state. The injection device 11 touches the mold 15 with the injection nozzle 21n, and injects and fills the molten (plasticized) resin (not shown) in the cavity of the mold 15.
- the mold clamping device 12 uses a direct pressure type hydraulic mold clamping device that displaces the movable mold 15 m by the drive ram 28a of the mold clamping cylinder (hydraulic cylinder) 28.
- the mold clamping device 12 has a fixed platen 29 whose position is fixed, and a movable platen 31 which is slidably loaded into a plurality of tie bars 30 erected between the fixed platen 29 and the mold clamping cylinder 28.
- the tip of the ram rod 28b protruding forward from the mold clamping cylinder 28 is fixed to the movable platen 31.
- a fixed mold 15c is attached to the fixed plate 29, and a movable mold 15 m is attached to the movable plate 31.
- the fixed mold 15c and the movable mold 15m form a mold 15.
- the mold clamping cylinder 28 opens and closes the mold 15 and clamps the mold.
- the mold clamping device 12 includes an ejector cylinder 32 that projects a molded product (not shown) adhering to the movable mold 15 m when the mold 15 is opened.
- the injection molding machine 10 includes a hydraulic circuit 33.
- the hydraulic circuit 33 includes a hydraulic pump 34 as a hydraulic drive source and a switching valve circuit 35.
- the injection molding machine 10 includes a servomotor 36 as an example of a motor that rotationally drives the hydraulic pump 34, and a rotary encoder 37 that detects the rotation speed of the servomotor 36.
- the hydraulic pump 34 is, for example, a swash plate type piston pump having a variable discharge capacity.
- the hydraulic pump 34 may be another type of hydraulic pump having a variable discharge capacity, or a hydraulic pump having a constant discharge capacity.
- the suction port of the hydraulic pump 34 is connected to the oil tank 38, and the discharge port of the hydraulic pump 34 is connected to the primary side of the switching valve circuit 35. Further, the secondary side of the switching valve circuit 35 is connected to the injection cylinder 24, the measuring motor 25, the mold clamping cylinder 28, the ejector cylinder 32, the moving cylinder 26 and other hydraulic actuators in the injection molding machine 10.
- the switching valve circuit 35 is an electromagnetic switching having a switching function related to supply, stop, and discharge of hydraulic oil to the injection cylinder 24, the measuring motor 25, the mold clamping cylinder 28, the ejector cylinder 32, the moving cylinder 26, and other hydraulic actuators. It is equipped with a valve (not shown).
- the injection molding machine 10 includes an electric circuit 40 shown in FIG. 2, which includes a control system circuit for controlling a servomotor 36, a heater 27, and the like.
- the electric circuit 40 includes a servo driver 50 as an example of a motor driver that inputs an AC of a predetermined voltage supplied from a commercial AC power supply 17 to drive and control the servo motor 36, and a commercial AC power supply 17. It is provided with a DC power supply circuit 60 that converts an alternating current of a predetermined voltage supplied from the above into a direct current having a control power supply voltage V0, which is an example of the supply voltage. Further, the electric circuit 40 includes a heater circuit 70 that heats and controls the heater 27 with electric power from the commercial AC power supply 17. Further, the electric circuit 40 includes a plurality of power supply circuits 44, 45, 46, 47 electrically connected to the DC power supply circuit 60, and a main controller 41.
- the servo driver 50 includes a servo controller 51.
- the DC of the control power supply voltage V0 output by the DC power supply circuit 60 is transmitted through the power supply circuits 44, 45, 46, 47 to the main controller 41, the sensor 42, the electric actuator 43, the switching valve circuit 35, and the servo controller 51.
- the voltage is stepped down to a predetermined voltage required at the supply destination and output.
- the main controller 41 is electrically connected to the sensor 42, and outputs control signals individually to the drive circuits of the servo controller 51, the electric actuator 43, and the switching valve circuit 35 based on the detection result input from the sensor 42.
- the servo controller 51 controls the three-phase voltage and frequency supplied to the servomotor 36 via the conversion circuit 52 shown in FIG. 3 that constitutes the servo driver 50 based on the control signal input from the main controller 41.
- the servo driver 50 controls the drive / stop of the servomotor 36 and the rotation speed during the drive.
- the heater circuit 70 is composed of a temperature control circuit that individually turns on / off the currents supplied to the plurality of heaters 27 based on the temperature control signals input from the main controller 41.
- the main controller 41 a part of the servo controller 51, the sensor 42, the electric actuator 43, the switching valve circuit 35, and the plurality of power supply circuits 44 to 47 are not shown.
- the servo controller 51 shows only the regenerative control circuit 57, which is a part thereof.
- the electric circuit 40 includes a servo driver 50, a DC power supply circuit 60, and a heater circuit 70.
- the predetermined voltage of the commercial AC power supply 17 is, for example, a predetermined value in the range of 300 to 500 V. In this example, the predetermined voltage is 440V as an example.
- the servo driver 50 includes a conversion circuit 52 controlled by the servo controller 51.
- the conversion circuit 52 converts the AC of a predetermined voltage input from the commercial AC power supply 17 into the voltage and frequency used for controlling the servomotor 36.
- the conversion circuit 52 includes a converter unit 53 as an example of a rectifier connected to a commercial AC power supply 17 that supplies a three-phase AC, a regenerative circuit 54, a smoothing capacitor 55, and an inverter unit 56 as an example of a switching circuit, in this order. It is connected with.
- the conversion circuit 52 has a high potential side power supply line (hereinafter referred to as “P line”) Lp and a low potential side power supply line (hereinafter referred to as “N line”) Ln.
- P line high potential side power supply line
- N line low potential side power supply line
- the converter unit 53 has six diodes D1 connected by a bridge, and rectifies an alternating current of a predetermined voltage input from the commercial AC power supply 17 to a direct current of a predetermined voltage.
- the six diodes D1 are arranged so that three sets of two diodes D1 connected in series in the same direction are connected in parallel between the P line Lp and the N line Ln. In each set, the corresponding wires of the three phases R, T, and S of the three-phase AC from the commercial AC power supply 17 are connected between the two diodes D1 connected in series. Therefore, the P line Lp is applied to a predetermined high potential, and the N line Ln is applied to a predetermined low potential.
- the smoothing capacitor 55 smoothes the pulsating current whose alternating current is rectified by the converter unit 53.
- the inverter unit 56 includes six arms in which the transistor Q1 and the diode D2 are connected in antiparallel. The six arms are arranged so that three sets of two arms connected in series between the P line Lp and the N line Ln are connected in parallel.
- the terminals of the three phases U, V, and W of the servomotor 36 are connected between three sets of transistors Q1 connected in series by two in the inverter unit 56, respectively.
- the inverter unit 56 is controlled by the servo controller 51. That is, the servo controller 51 controls the voltage and frequency supplied to the servomotor 36 by switching on / off of the six transistors Q1 by, for example, PWM (Pulse Width Modulation) control. As a result, the drive / stop and rotation speed of the servomotor 36 are controlled.
- PWM Pulse Width Modulation
- the main controller 41 drives the servomotor 36 when hydraulic oil is required in the hydraulic circuit 33 (see FIG. 1) based on the detection results of the various sensors 42, and the detection results of the various sensors 42 are obtained. Based on this, the drive of the servomotor 36 is stopped when the hydraulic oil in the hydraulic circuit 33 is not required.
- the servomotor 36 generates electricity in the deceleration process to generate a regenerative current.
- the electric power generated by the servomotor 36 is stored in the smoothing capacitor 55.
- the regenerative circuit 54 includes a resistor R1, a diode D3, and a transistor Q2 connected between the P line Lp and the N line Ln.
- the resistor R1 and the diode D3 are connected in parallel, and the terminal on the low voltage side of the resistor R1 is connected to the collector terminal of the transistor Q2.
- the emitter terminal of the transistor Q2 is connected to the N line Ln.
- the regeneration control circuit 57 inputs a voltage between the P terminal on the P line Lp and the N terminal on the N line Ln.
- the regeneration control circuit 57 turns off the transistor Q2 when the voltage value between the input P terminal and the N terminal is equal to or less than the threshold value, and turns on the transistor Q2 when the voltage value exceeds the threshold value.
- the transistor Q2 is off, the regenerative current of the servomotor 36 is stored in the smoothing capacitor 55.
- the transistor Q2 is on, the regenerative current of the servomotor 36 is consumed as heat by the resistor R1.
- the DC power supply circuit 60 includes a rectifier circuit 61 which is an example of the first rectifier circuit, a smoothing capacitor 62, a switching circuit 63, an isolation transformer 64, and a rectifier circuit 65 and a smoothing circuit 66 which are examples of the second rectifier circuit.
- the isolation transformer 64 is, for example, a high frequency isolation transformer.
- the rectifier circuit 61 has four diodes D4 connected by a bridge, and rectifies an alternating current of a predetermined voltage between two phases input from a commercial AC power supply 17 to a direct current of a predetermined voltage.
- the four diodes D4 are arranged so that two sets of two diodes D4 connected in series in the same direction are connected in parallel between the high potential side power supply line La and the low potential side power supply line Lb. There is. In each set, the corresponding wire of the two phases of the three-phase alternating current from the commercial AC power supply 17 is connected between the two diodes D4 connected in series. Therefore, the high potential side power supply line La is applied to a predetermined high potential, and the low potential side power supply line Lb is applied to a predetermined low potential.
- the smoothing capacitor 62 smoothes the pulsating current whose alternating current is rectified by the rectifier circuit 61.
- the switching circuit 63 includes four arms in which the transistor Q3 and the diode D5 are connected in antiparallel. The four arms are arranged so that two sets of two arms connected in series between the high potential side power supply line La and the low potential side power supply line Lb are connected in parallel. Two terminals of the primary coil of the isolation transformer 64 are connected to each of the two transistors Q3 in each set in which two are connected in series. The base terminals of the four transistors Q3 are connected to the voltage control circuit 69.
- the voltage control circuit 69 controls the voltage and frequency output to the primary coil of the isolation transformer 64 by controlling the four transistors Q3 to be turned on and off by PWM control.
- the rectifier circuit 65 has four diodes D6 connected by a bridge, and rectifies a predetermined voltage and a current of a predetermined frequency input from the secondary coil of the isolation transformer 64 to direct current.
- the four diodes D6 are arranged so that two sets of two diodes D6 connected in series in the same direction are connected in parallel between the high potential side power supply line Lc and the low potential side power supply line Ld. There is. In each set, the corresponding terminal of the two terminals of the secondary coil of the isolation transformer 64 is connected between the two diodes D6 connected in series. Therefore, the high potential side power supply line Lc is applied to a predetermined high potential, and the low potential side power supply line Ld is applied to a predetermined low potential.
- the smoothing circuit 66 includes a coil 67 connected in series with the high potential side power supply line Lc, and a smoothing capacitor 68 connected between the high potential side power supply line Lc and the low potential side power supply line Ld. Therefore, the high potential side power supply line Lc is applied to the high potential + V volt, and the low potential side power supply line Ld is applied to the low potential ⁇ V volt (for example, 0V). Therefore, the DC power supply circuit 60 outputs the voltage between the terminal T1 on the high potential side power supply line Lc and the terminal T2 on the low potential side power supply line Ld as the control power supply voltage V0.
- the voltage control circuit 69 inputs the voltage between the two terminals T1 and T2, and when the input voltage is a value exceeding the permissible range with respect to the control power supply voltage V0, PWMs the on / off of the four transistors Q3. Switch by control. As a result, the voltage control circuit 69 controls the voltage and frequency output to the primary coil of the isolation transformer 64, and adjusts the voltage between the terminals T1 and T2 to be the target control power supply voltage V0.
- the capacity of the smoothing capacitor 55 is C1
- the capacity of the smoothing capacitor 62 is C2
- the capacity of the smoothing capacitor 68 is C3.
- the magnitude relationship between the capacities C1, C2, and C3 is C1> C2> C3. Since the smoothing capacitor 55 in the servo driver 50 is used for motor control, a large capacity is required.
- the smoothing capacitors 62 and 68 in the DC power supply circuit 60 need to have a smaller capacity than the smoothing capacitor 55.
- the servo driver 50 and the DC power supply circuit 60 are electrically connected via a bypass circuit 80 including a backflow prevention circuit 81.
- the backflow prevention circuit 81 allows the current based on the voltage stored in the smoothing capacitor 55 constituting the servo driver 50 to flow in the direction of being supplied to the DC power supply circuit 60, and blocks the current flowing in the opposite direction.
- the bypass circuit 80 includes a first bypass line L1 that connects the P line Lp on the servo driver 50 side and the high potential side power supply line La on the DC power supply circuit 60 side, and an N line Ln on the servo driver 50 side and DC.
- a second bypass line L2 for connecting to the low potential side power supply line Lb on the power supply circuit 60 side is provided.
- the backflow prevention circuit 81 is provided on the first bypass line L1 and includes a first diode 82 that allows a current in the direction from the servo driver 50 toward the DC power supply circuit 60 and blocks the current in the reverse direction. ..
- the electric charge stored in the smoothing capacitor 55 causes a current to flow from the P line Lp to the high potential side power supply line La of the DC power supply circuit 60 via the bypass circuit 80, and the smoothing capacitor 62 is stored.
- the time for which the potential of the high potential side power supply line La is maintained at a high potential is extended.
- the time during which the DC power supply circuit 60 can continue to output the control power supply voltage V0 after the start of the instantaneous power failure is extended.
- the current flowing to the high potential side power supply line La of the DC power supply circuit 60 via the bypass circuit 80 is prevented from flowing to the commercial AC power supply 17 side by the diode D4 of the rectifying circuit 61, so that the current flows to the heater circuit. It is avoided that it flows to 70 and is consumed. Therefore, the current from the bypass circuit 80 is efficiently used to keep the high potential side power supply line La of the DC power supply circuit 60 at a high potential. From this point as well, the time during which the DC power supply circuit 60 can continue to output the control power supply voltage V0 from the start of the instantaneous power failure can be extended.
- the DC power supply circuit 60 can output a DC with a stable control power supply voltage V0.
- the power outage time Tpc of an instantaneous power outage that occurs in a country or region where the power supply condition of the commercial AC power supply 17 is poor is in the range of several tens of milliseconds to less than 100 milliseconds.
- the capacity of the smoothing capacitor 62 in the DC power supply circuit 60 is not sufficient for the power failure time Tpc at the time of a momentary power failure.
- the high potential side power supply line of the DC power supply circuit 60 The potential of La is maintained at a high potential. Therefore, the high potential side power supply line La is maintained at the required high potential during the instantaneous power failure.
- the DC power supply circuit 60 can output the required control power supply voltage V0 during the period until the power is restored in the event of a momentary power failure. Therefore, the control during execution by the main controller 41 is not forcibly stopped, and the forcible stop of the injection molding machine 10 is avoided. As a result, the frequency with which the injection molding machine 10 can be continued in the event of a momentary power failure increases. For example, when the injection molding machine 10 is forcibly stopped at the time of a momentary power failure, it takes time for restoration work such as turning the power off and then on again in order to restart the operation of the injection molding machine 10, and the productivity of the injection molding machine 10 is reduced.
- the injection molding machine 10 of the first embodiment can continue the operation of the injection molding machine 10 at the time of a momentary power failure, the decrease in productivity due to the momentary power failure can be suppressed as much as possible.
- An evaluation test of the electric circuit 40 of the first embodiment was performed.
- the mold opening process which is one of the processes with a large load in the molding cycle of the injection molding machine 10
- a momentary power failure of about 100 milliseconds is forcibly generated, so that the effect of the injection molding machine 10 at the time of a momentary power failure can be obtained.
- An instantaneous power failure was simulated by performing an operation of momentarily turning off the original power switch and immediately returning it to ON during the mold opening process during the automatic operation of the injection molding machine 10.
- the power failure time Tpc at the time of an actual instantaneous power failure is less than 100 milliseconds.
- FIG. 4 is a graph showing the evaluation results of the electric circuit of the comparative example not provided with the bypass circuit 80.
- FIG. 5 is a graph showing the evaluation results of the electric circuit 40 of the embodiment including the bypass circuit 80. 4 and 5 show the voltages measured at the four measurement points in the electric circuit 40. That is, the measured voltages are the AC input voltage Vac, the servo power supply voltage Vpn, the motor voltage Vm, and the control power supply voltage Vdc.
- the AC input voltage Vac is a voltage input from the commercial AC power supply 17.
- the servo power supply voltage Vpn is a voltage between the P line Lp and the N line Ln.
- the motor voltage Vm is a voltage supplied to the servomotor 36.
- the control power supply voltage Vdc is the output voltage of the DC power supply circuit 60.
- FIG. 4 shows the measurement results of the respective voltages Vac, Vpn, Vm, and Vdc when the power failure time Tpc at the time of a momentary power failure is 114 milliseconds in the comparative example.
- the power supply from the commercial AC power supply 17 is stopped, so the AC input voltage Vac becomes 0 volt.
- the servo power supply voltage VPN gradually decreases from the start of the instantaneous power failure. This is because the electric charge stored in the smoothing capacitor 55 is gradually reduced.
- the servo power supply voltage Vpn returned to the required high potential after recovering from the instantaneous power failure.
- the motor voltage Vm decreased and became unstable from the start of the instantaneous power failure, and the required motor voltage could not be supplied even after the power was restored from the instantaneous power failure.
- the control power supply voltage Vdc is maintained at the required control power supply voltage V0 by the electric charge stored in the smoothing capacitor 62 for a predetermined time from the start of the instantaneous power failure, but then drops to 0 volt.
- This drop in the control power supply voltage Vdc leads to a drop in the drive voltage of the main controller 41. Therefore, when the main controller 41 detects a drop in the supplied drive voltage, the main controller 41 forcibly stops the control during execution. As a result, the servomotor 36 and the electric actuator 43 are forcibly stopped. That is, the injection molding machine 10 is in an emergency stop.
- FIG. 5 shows the measurement results of the respective voltages Vac, Vpn, Vm, and Vdc when the power failure time Tpc at the time of a momentary power failure is 160 milliseconds in the embodiment.
- the power supply from the commercial AC power supply 17 is stopped, so the AC input voltage Vac becomes 0 volt.
- the AC input voltage Vac returns to a predetermined voltage (for example, 440V).
- the servo power supply voltage VPN gradually decreases from the start of the instantaneous power failure. This is because the electric charge stored in the smoothing capacitor 55 is used to maintain the high potential, but the stored electric charge gradually decreases.
- the servo power supply voltage Vpn returned to the required high potential after recovering from the instantaneous power failure.
- the control power supply voltage Vdc flows to the DC power supply circuit 60 via the bypass circuit 80 by the electric charge stored in the smoothing capacitor 62 and the electric charge stored in the smoothing capacitor 55 during a predetermined time from the start of the instantaneous power failure.
- the current keeps it at the required high potential.
- the time for which the control power supply voltage Vdc is maintained at the target control power supply voltage V0 is extended by the amount of the current flowing through the bypass circuit 80 to the DC power supply circuit 60.
- the control power supply voltage Vdc is maintained at the required control power supply voltage V0 even after the power is restored from the instantaneous power failure. Therefore, the main controller 41 can continue the control during execution, and the servomotor 36 and the electric actuator 43 are continuously driven. That is, the injection molding machine 10 continues to operate without stopping.
- the injection molding machine 10 stopped when the power failure time Tpc was 114 ms, 124 ms, and 148 ms.
- the power failure time Tpc was 128 ms, 132 ms, 136 ms, 146 ms, or 160 ms
- the injection molding machine 10 was used even after a momentary power failure.
- the power failure time Tpc was 175 milliseconds at the longest. Therefore, according to the injection molding machine 10 of the embodiment, it is effective for an instantaneous power failure of up to about 150 milliseconds. This means that it is effective in preventing the forced stop of the injection molding machine 10 at the time of a momentary power failure in a country or region where the power failure time Tpc at the time of a momentary power failure is less than 100 milliseconds.
- the electric circuit 40 of the injection molding machine 10 includes a servo driver 50 having a conversion circuit 52 that converts an AC of a predetermined voltage input from a commercial AC power supply 17 into a voltage and frequency used for controlling the servo motor 36, and a commercial AC. It is provided with a DC power supply circuit 60 that converts an AC of a predetermined voltage input from the AC power supply 17 into a DC having a supply voltage lower than the predetermined voltage and outputs the AC.
- the conversion circuit 52 includes a converter unit 53, a smoothing capacitor 55, and an inverter unit 56 as an example of a switching circuit.
- the servo driver 50 and the DC power supply circuit 60 are connected via a bypass circuit 80 including a backflow prevention circuit 81 that allows a current from the smoothing capacitor 55 to the DC power supply circuit 60. Therefore, at the time of a momentary power failure of the commercial AC power supply 17, the current due to the electric charge stored in the smoothing capacitor 55 is supplied from the servo driver 50 to the DC power supply circuit 60 via the backflow prevention circuit 81. Therefore, the DC power supply circuit 60 can supply a predetermined voltage of DC during a momentary power failure. As a result, the servomotor 36 continues to be driven even after the power is restored from the momentary power failure of the commercial AC power supply 17.
- the servomotor 36 is continuously driven after the power is restored at the time of a momentary power failure with a simple circuit configuration and without performing special control, and injection molding is performed.
- the frequency with which the operation of the machine 10 can be continued can be increased.
- the electric circuit 40 further includes a heater circuit 70 that heats the heater 27 by alternating current supplied from a commercial alternating current power source 17 common to the direct current power supply circuit 60.
- the DC power supply circuit 60 includes a first rectifier circuit 61 that converts AC from a commercial AC power supply 17 into rectifier, a switching circuit 63 that converts rectifier into AC by PWM control, and an isolated transformer 64 that converts AC frequency. It includes a second rectifying circuit 65 that converts alternating current of the converted frequency into rectification, and a smoothing circuit 66 that smoothes rectifying to direct current of the supply voltage.
- the current supplied from the smoothing capacitor 55 to the DC power supply circuit 60 at the time of a momentary power failure can be prevented from flowing to the heater circuit 70 via the DC power supply circuit 60 by the backflow prevention function of the diode D4 constituting the rectifier circuit 61. .. Therefore, the current supplied from the smoothing capacitor 55 to the DC power supply circuit 60 at the time of a momentary power failure can be effectively used to extend the time during which the high potential side power supply line La can be held at the required high potential. Therefore, since the servomotor 36 can be continuously driven even after the power is restored from the instantaneous power failure, the frequency with which the injection molding machine 10 can be continuously operated can be further increased.
- the second embodiment is different from the first embodiment in that a second smoothing capacitor externally attached in parallel with the smoothing capacitor 55 is provided.
- the description of the same configuration as that of the first embodiment will be omitted, and only the different configurations will be described.
- FIG. 6 the same reference numerals are given to the circuit portions common to those in FIG. 3, and the circuits are shown by one block.
- the servo driver 50 includes an external unit 58 having a terminal that can be connected in parallel with the smoothing capacitor 55.
- An external second smoothing capacitor 59 is connected to the external unit 58 in parallel with the smoothing capacitor 55 in the servo driver 50. That is, two smoothing capacitors 55 and 59 are connected in parallel between the P line Lp and the N line Ln.
- the time during which the potential of the P line Lp in the servo driver 50 can be held at a higher potential than that of the electric circuit 40 of the first embodiment and the potential of the high potential side power supply line La in the DC power supply circuit 60 are set.
- the time that can be held at a high potential can be further extended. Therefore, the motor voltage Vm and the control power supply voltage Vdc can be returned to the target voltage after the power is restored from the instantaneous power failure. As a result, the operation of the injection molding machine 10 can be continued even in the event of a momentary power failure.
- a second smoothing capacitor 59 is externally attached to the servo driver 50 in parallel with the smoothing capacitor 55. Therefore, it is possible to further increase the frequency with which the injection molding machine 10 can be continued to operate in the event of a momentary power failure of the commercial AC power supply 17.
- the injection molding machine 10 of the first embodiment and the second embodiment is an electro-hydraulic type in which a servomotor 36 drives a hydraulic pump 34, but the injection molding machine 10 of the third embodiment is an electric type. ..
- the electric injection molding machine 10 replaces the injection cylinder 24, the weighing motor 25, the mold clamping cylinder 28, the ejector cylinder 32, and the moving cylinder 26 in the first embodiment, and replaces the injection motor, the weighing motor, and the mold clamping motor, respectively. It is equipped with an ejector motor and a moving motor for touching the nozzle.
- the injection molding machine 10 includes, for example, four servomotors 36.
- the four servo motors 36 are an injection motor, a weighing motor, a mold clamping motor, and an ejector motor.
- the electric circuit 40 of the injection molding machine 10 includes a servo driver 50 that controls a plurality of servo motors 36.
- the conversion circuit 52 included in the servo driver 50 includes a first conversion circuit 521, a second conversion circuit 522, ..., And an Nth conversion circuit 52N that individually controls N servomotors 36.
- N conversion circuits 521 to 52N are connected in parallel between the common P line Lp and the N line Ln in the conversion circuit 52, respectively.
- the N conversion circuits 521 to 52N include at least a smoothing capacitor 55 and an inverter section 56 for each servomotor 36.
- the first conversion circuit 521 includes a converter unit 53, a regenerative circuit 54, a smoothing capacitor 55, and an inverter unit 56.
- the remaining second conversion circuit 522, ..., And the Nth conversion circuit 52N include a smoothing capacitor 55 and an inverter unit 56, respectively.
- the single converter unit 53 and the single regenerative circuit 54 are commonly used among the plurality of conversion circuits 521 to 52N.
- the conversion circuit 52 may include a converter unit 53, a smoothing capacitor 55, and an inverter unit 56 for each servomotor 36.
- the P line Lp and the N line Ln are connected to the high potential side power supply line La and the low potential side power supply line Lb in the DC power supply circuit 60 via the bypass circuit 80. That is, the P line Lp is connected to the high potential side power supply line La via the first diode 82 of the backflow prevention circuit 81, and the N line Ln is connected to the low potential side power supply line Lb.
- the electric circuit 40 of the third embodiment includes M (where M is a natural number) DC power supply circuits 60.
- M 1, but the electric circuit 40 may include two or more M DC power supply circuits 60 (where M is two or more natural numbers).
- the configuration of the DC power supply circuit 60 is the same as that of the first embodiment. That is, the DC power supply circuit 60 includes a rectifier circuit 61 as an example of the first rectifier circuit, a smoothing capacitor 62, a switching circuit 63, an isolation transformer 64, and a rectifier circuit 65 and a smoothing circuit 66 as an example of the second rectifier circuit. To be equipped.
- the magnitude relationship of N> M is established between the number N of the servomotors 36 and the number M of the DC power supply circuits 60.
- the number N of the servomotors 36 is equal to the number of conversion circuits 521 to 52N provided for each servomotor 36, which is equal to the number of smoothing capacitors 55 constituting the conversion circuits 521 to 52N. That is, N smoothing capacitors 55 are connected to M DC power supply circuits 60 via the bypass circuit 80.
- the P line Lp of the conversion circuit 52 is connected to the M high potential side power supply lines La of the M DC power supply circuits 60 by the first bypass line L1 via the first diode 82, and is a conversion circuit.
- the third embodiment when a plurality of DC power supply circuits 60 (M ⁇ 2) are provided, the number of smoothing capacitors 55 and the DC power supply circuits 60 satisfies N> M, so that the DC power supply circuits 60 The number of smoothing capacitors 55 allocated to each of the above exceeds "1".
- the electric circuit 40 of the third embodiment satisfying N> M can maintain the potentials of the P line Lp and the high potential side power supply line La at a higher potential at the time of a momentary power failure than the electric circuit 40 of the first embodiment.
- the time can be further extended.
- the frequency with which the injection molding machine 10 can be continued in the event of a momentary power failure becomes higher.
- the following effects can be obtained in addition to the same effects as those of the first embodiment.
- the servo driver 50 controls a plurality of servo motors 36.
- the conversion circuit 52 includes at least a smoothing capacitor 55 and an inverter unit 56 as an example of the switching circuit for each of the plurality of servomotors 36.
- a plurality of smoothing capacitors 55 are connected to the DC power supply circuit 60 via the bypass circuit 80. Therefore, in the event of a momentary power failure of the commercial AC power supply 17, the current due to the electric charges stored in the plurality of smoothing capacitors 55 is supplied to the DC power supply circuit 60, so that the injection molding machine 10 can be continuously operated in the event of a momentary power failure. It gets higher.
- the injection molding machine 10 includes N servomotors 36 (where N is a natural number of 2 or more).
- the electric circuit 40 includes N conversion circuits 521 to 52N and M (where M is a natural number of 2 or more) DC power supply circuits 60.
- N smoothing capacitors 55 are connected to M DC power supply circuits 60 via a bypass circuit 80.
- N is more than M (N> M). Therefore, at the time of a momentary power failure of the commercial AC power supply 17, the current due to the electric charge stored in the N smoothing capacitors 55 is supplied to the M DC power supply circuits 60, which are less than N. Therefore, the frequency with which the injection molding machine 10 can be continuously operated in the event of a momentary power failure is further increased.
- the embodiment is not limited to the above, and may be changed to the following aspects.
- the conversion circuit 52 may be provided with a rectifier (converter unit 53), a smoothing capacitor 55, and a switching circuit (inverter unit 56), and may not be provided with, for example, a regenerative circuit 54.
- the number of externally attached second smoothing capacitors 59 may be plural.
- the second smoothing capacitor 59 may be externally connected to the servo driver 50 in parallel with the smoothing capacitor 55 as in the second embodiment. ..
- the capacity of some of the smoothing capacitors 55 among the plurality of (N) smoothing capacitors each of the plurality of conversion circuits provided for each motor is set to be larger than the capacity of the other smoothing capacitors.
- the combination of the number N of the smoothing capacitors 55 constituting the conversion circuit 52 and the number M of the DC power supply circuits 60 is within the range in which N> M is established. May be changed as appropriate.
- the combination of N pieces and M pieces may be a combination of 3 pieces and 2 pieces, a combination of 4 pieces and 2 pieces, a combination of 4 pieces and 3 pieces, a combination of 5 pieces and 2 pieces, and the like.
- the injection motor, the weighing motor, the mold clamping motor, the ejector motor, and the mobile motor may be classified into a first set and a second set.
- the first set of conversion circuits 52 corresponding to the first set of motors and the second set of conversion circuits 52 corresponding to the second set of motors have P lines and N lines, respectively.
- two DC power supply circuits 60 are provided, and the first set of conversion circuits 52 and one DC power supply circuit 60 are connected via the first bypass circuit 80 to connect with the second set of conversion circuits 52.
- the other DC power supply circuit 60 may be connected via the second bypass circuit 80.
- N> M is set, but M> N may be used.
- the servo motor 36 may use any type of motor, for example, an AC motor or a DC motor. In short, it suffices if the motor driver that drives the motor has a rectifier, a smoothing capacitor, and a switching circuit.
- the electric circuit (40) of the injection molding machine (10) is Based on a motor controller (for example, a servo controller) (51) which is a motor driver (50) for driving a motor (36) and is configured to generate a first control signal, and the first control signal.
- a conversion circuit (52) that converts a commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first AC voltage (Vm) used for controlling the motor (36).
- Motor driver (50) and A direct current that converts the commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first DC voltage and supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51).
- the conversion circuit (52) of the motor driver (50) includes a first smoothing capacitor (55), and the DC power supply circuit (60) includes a second smoothing capacitor (62).
- the motor driver (50) uses the DC power supply via a bypass circuit (80) including a backflow prevention circuit (81) that allows a current from the first smoothing capacitor (55) to the DC power supply circuit (60). It can be connected to the circuit (60).
- the first smoothing capacitor (55) of the motor driver (50) is the high potential side power supply line (Lp) and the low potential side of the motor driver (50).
- the second smoothing capacitor (62) of the DC power supply circuit (60) includes a first high potential side power supply line (La) and a first low potential side power supply line (Lb) of the DC power supply circuit (60). Connected between The high potential side power supply line (Lp) of the motor driver (50) is connected to the first high potential side power supply line (La) of the DC power supply circuit (60) via the bypass circuit (80). be able to.
- the motor driver (50) includes a rectifier (53) that converts a commercial AC voltage (Vac) from the commercial AC power supply into a first rectified voltage, and the above.
- the first smoothing capacitor (55) that smoothes the first rectified voltage to generate a second DC voltage, and the second DC voltage based on the first control signal is the first AC voltage.
- a switching circuit (56) that converts to (Vm) can be included.
- the DC power supply circuit (60) is a second rectifying circuit (60) that converts a commercial AC voltage (Vac) from the commercial AC power supply into a second rectifying voltage. 61), the second smoothing capacitor (62) that smoothes the second rectified voltage to generate a third DC voltage, and the third DC voltage by PWM control to the commercial AC voltage (Vac).
- a switching circuit (63) that converts to a lower second AC voltage, an isolated transformer (64) that changes the frequency of the second AC voltage, and a third AC voltage that has the changed frequency.
- a third rectifying circuit (65) that converts to the rectifying voltage of the above, and a smoothing circuit (66) that smoothes the third rectifying voltage to generate the first DC voltage (Vdc) can be included. ..
- the primary coils of the second rectifying circuit (61), the switching circuit (63), and the isolated transformer (64) of the DC power supply circuit (60) are ,
- the secondary coil of (64), the third rectifying circuit (65), and the smoothing circuit (66) are the second high potential side power supply line (Lc) and the second power supply line (Lc) of the DC power supply circuit (60). It can be connected to the low potential side power supply line (Ld).
- the electric circuit (40) of the injection molding machine (10) is configured to generate a second control signal and transmit it to the motor controller (51). Further equipped with the main controller (41)
- the motor controller (51) is further configured to generate the first control signal based on the second control signal.
- the DC power supply circuit (60) supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51) via the first power supply circuit (47), and supplies the main controller (41) with the first DC voltage (Vdc).
- the first DC voltage (Vdc) is supplied as a power supply voltage via the second power supply circuit (44).
- the first power supply circuit (47) adjusts the voltage value of the first DC voltage (Vdc) to a voltage value corresponding to the motor controller (51), and the second power supply circuit (44) adjusts the voltage value to correspond to the motor controller (51).
- the voltage value of the first DC voltage (Vdc) can be adjusted to the voltage value corresponding to the main controller (41).
- the commercial AC voltage (Vac) supplied from the commercial AC power supply (17) to the motor driver (50) is a three-phase AC voltage, and is the commercial AC voltage.
- the commercial AC voltage (Vac) supplied from the AC power supply (17) to the DC power supply circuit (60) can be a two-phase AC voltage.
- inverter section as an example of a switching circuit, 57 ... Regenerative control circuit, 59 ... Second smoothing capacitor, 60 ... DC power supply circuit, 61 ... Rectification circuit as an example of the first rectifying circuit, 62 ... Smoothing capacitor, 63 ... Switching circuit, 64 ... Insulated transformer, 65 ... A rectifying circuit as an example of the second rectifying circuit, 66 ... smoothing circuit, 69 ... voltage control circuit, 70 ... heater circuit, 80 ... bypass circuit, 81 ... backflow prevention circuit, Lp ... P line (high potential side power supply line), Ln ... N line (low potential side power supply line), La ... high potential side power supply line, Lb ... low potential side power supply line, Lc ...
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Abstract
An injection molding machine is provided with an electrical circuit 40 which has a servo driver 50 that drives and controls a servo motor 36. The electrical circuit 40 is provided with: the servo driver 50, which has a conversion circuit 52 that converts the AC current of a prescribed voltage inputted from a commercial AC power supply 17 to a voltage and frequency used to control the servo motor 36; and a DC power supply circuit 60, which converts the AC current of a prescribed voltage inputted from the commercial AC power supply 17 to a DC current of a supply voltage lower than the prescribed voltage, and outputs the DC current. The conversion circuit 52 is provided with a converter unit 53, a smoothing capacitor 55 and an inverter unit 56. The servo driver 50 and the DC power supply circuit 60 are connected via a bypass circuit 80 which includes a backflow prevention circuit 81 that allows current to flow from the smoothing capacitor 55 towards the DC power supply circuit 60.
Description
本発明は、モータを備えた射出成形機の電気回路に関する。
The present invention relates to an electric circuit of an injection molding machine equipped with a motor.
例えば、特許文献1~4には、サーボモータを備える射出成形機の電気回路が開示されている。射出成形機は、サーボモータを駆動制御する電気回路を備える。
For example, Patent Documents 1 to 4 disclose an electric circuit of an injection molding machine including a servomotor. The injection molding machine includes an electric circuit that drives and controls a servomotor.
特許文献1では、コンデンサにより構成されたエネルギー保持回路と停電検出回路を設け、停電時に成形機を保護する停電処理動作を行い、成形機の動作を安全かつ正常に終了させる射出成形機の電気回路が開示されている。
In Patent Document 1, an energy holding circuit composed of a capacitor and a power failure detection circuit are provided, a power failure processing operation that protects the molding machine in the event of a power failure is performed, and an electric circuit of the injection molding machine that safely and normally terminates the operation of the molding machine. Is disclosed.
また、特許文献2には、インバータの平滑コンデンサと充電器を併用し、充放電を行うことにより、省エネや停電対策を行う射出成形機の電気回路が開示されている。
Further, Patent Document 2 discloses an electric circuit of an injection molding machine that saves energy and takes measures against a power failure by charging and discharging a smoothing capacitor of an inverter and a charger in combination.
さらに、特許文献3には、蓄電部としてコンデンサを用い、モータの減速に伴う回生電流を利用してモータの加速制御に必要な電力を平準化する射出成形機の電気回路が開示されている。
Further, Patent Document 3 discloses an electric circuit of an injection molding machine that uses a capacitor as a power storage unit and uses a regenerative current accompanying deceleration of the motor to level the electric power required for acceleration control of the motor.
また、特許文献4には、整流器や駆動装置に平滑コンデンサを備え、停電検出時に制御指令値を低下させて圧力や速度を低下させることで停電時の運転継続機能を確保する射出成形機の電気回路が開示されている。
Further, in Patent Document 4, the rectifier and the driving device are provided with a smoothing capacitor, and the control command value is lowered at the time of power failure detection to reduce the pressure and speed to secure the operation continuation function at the time of power failure. The circuit is disclosed.
しかしながら、商用交流電源の電源事情が悪い国や地域では、電力供給が不安定などの理由で、商用交流電源が一瞬停止する瞬時停電が発生する。瞬時停電が発生すると、射出成形機の運転が停止してしまう。従来の射出成形機の電気回路においては、瞬時停電時に射出成形機の運転の停止を抑制できるものの、構造が複雑で高価であったり、停電検出や制御指令の低下などの特別な検出や制御が必要であったりするという課題がある。そのため、簡単な構成でかつ特別な制御を行うことなく、瞬時停電時にも射出成形機の運転を継続できる電気回路が要望されている。
However, in countries and regions where the power supply situation of commercial AC power supplies is poor, a momentary power outage occurs in which the commercial AC power supply stops momentarily due to reasons such as unstable power supply. If a momentary power failure occurs, the operation of the injection molding machine will stop. In the electric circuit of a conventional injection molding machine, it is possible to suppress the stoppage of the operation of the injection molding machine in the event of a momentary power failure, but the structure is complicated and expensive, and special detection and control such as power failure detection and reduction of control command are performed. There is a problem that it is necessary. Therefore, there is a demand for an electric circuit having a simple configuration and capable of continuing the operation of the injection molding machine even in the event of a momentary power failure without performing special control.
本発明の目的は、瞬時停電時に射出成形機の運転を継続できる頻度を高めることができる射出成形機の電気回路を提供することにある。
An object of the present invention is to provide an electric circuit of an injection molding machine capable of increasing the frequency with which the injection molding machine can be continued to operate in the event of a momentary power failure.
以下、上記課題を解決するための手段及びその作用効果について記載する。
The means for solving the above problems and their actions and effects will be described below.
上記課題を解決する射出成形機の電気回路は、モータを駆動制御するモータドライバを有する射出成形機の電気回路であって、商用交流電源から入力した所定電圧の交流を前記モータの制御に用いられる電圧及び周波数に変換する変換回路を有するモータドライバと、商用交流電源から入力した所定電圧の交流を前記所定電圧よりも低い制御供給電圧の直流に変換して出力する直流電源回路とを備え、前記変換回路は、整流器と平滑コンデンサとスイッチング回路とを備え、前記モータドライバと前記直流電源回路は、前記平滑コンデンサから前記直流電源回路へ向かう電流を許容する逆流防止回路を含むバイパス回路を介して接続されている。
The electric circuit of the injection molding machine that solves the above problems is an electric circuit of the injection molding machine having a motor driver that drives and controls the motor, and an AC of a predetermined voltage input from a commercial AC power supply is used to control the motor. A motor driver having a conversion circuit for converting voltage and frequency, and a DC power supply circuit for converting AC of a predetermined voltage input from a commercial AC power supply into DC having a control supply voltage lower than the predetermined voltage and outputting the DC power supply circuit. The conversion circuit includes a rectifier, a smoothing capacitor, and a switching circuit, and the motor driver and the DC power supply circuit are connected via a bypass circuit including a backflow prevention circuit that allows a current from the smoothing capacitor to the DC power supply circuit. Has been done.
この構成によれば、商用交流電源が一瞬停止する瞬時停電時には、平滑コンデンサに蓄電された電荷による電流がモータドライバから逆流防止回路を含むバイパス回路を介して直流電源回路に供給される。この結果、直流電源回路は、瞬時停電の間においても、所定電圧の直流を供給できる。この結果、商用交流電源の瞬時停電の復電後もモータの駆動が継続される。よって、簡単な回路構成でかつ特別な制御を行うことなく、瞬時停電時の復電後にモータの駆動が継続され、射出成形機の運転を継続できる頻度を高めることができる。
According to this configuration, in the event of a momentary power failure when the commercial AC power supply is stopped for a moment, the current due to the electric charge stored in the smoothing capacitor is supplied from the motor driver to the DC power supply circuit via the bypass circuit including the backflow prevention circuit. As a result, the DC power supply circuit can supply a predetermined voltage of DC even during a momentary power failure. As a result, the motor continues to be driven even after the power is restored from the momentary power failure of the commercial AC power supply. Therefore, it is possible to increase the frequency with which the operation of the injection molding machine can be continued by continuing the driving of the motor after the power is restored in the event of a momentary power failure with a simple circuit configuration and without performing special control.
上記射出成形機の電気回路は、前記直流電源回路と共通の前記商用交流電源から供給される交流によりヒータを発熱させるヒータ回路を更に備え、前記直流電源回路は、前記商用交流電源からの交流を整流に変換する第1整流回路と、PWM制御により整流を交流に変換するスイッチング回路と、交流の周波数を変換する絶縁トランスと、変換された周波数の交流を整流に変換する第2整流回路と、整流を供給電圧の直流に平滑化する平滑回路とを備えてもよい。
The electric circuit of the injection molding machine further includes a heater circuit that heats a heater by alternating current supplied from the commercial alternating current power supply common to the DC power supply circuit, and the DC power supply circuit receives alternating current from the commercial alternating current power supply. A first rectifying circuit that converts rectification, a switching circuit that converts rectification to alternating current by PWM control, an isolated transformer that converts alternating current frequency, and a second rectifying circuit that converts alternating current at the converted frequency into rectifying current. A smoothing circuit that smoothes the rectification to the direct current of the supply voltage may be provided.
この構成によれば、直流電源回路の整流回路は、瞬時停電時に平滑コンデンサから直流電源回路に供給される電流の一部が、直流電源回路を介してヒータ回路に流れることを阻止する。よって、瞬時停電が発生してもモータの駆動を継続でき、射出成形機の運転を継続できる頻度を一層高めることができる。
According to this configuration, the rectifier circuit of the DC power supply circuit prevents a part of the current supplied from the smoothing capacitor to the DC power supply circuit from flowing to the heater circuit via the DC power supply circuit at the time of a momentary power failure. Therefore, even if a momentary power failure occurs, the motor can be continuously driven, and the frequency of continuing the operation of the injection molding machine can be further increased.
上記射出成形機の電気回路は、前記モータドライバに対して、前記平滑コンデンサと並列に第2の平滑コンデンサが外付けされてもよい。
In the electric circuit of the injection molding machine, a second smoothing capacitor may be externally attached to the motor driver in parallel with the smoothing capacitor.
この構成によれば、商用交流電源の瞬時停電時に、平滑コンデンサ複数個分の電荷が蓄電されるので、射出成形機の運転を継続できる頻度を一層高めることができる。
According to this configuration, the electric charge for a plurality of smoothing capacitors is stored in the event of a momentary power failure of the commercial AC power supply, so that the frequency with which the injection molding machine can be continued can be further increased.
上記射出成形機の電気回路は、前記モータドライバは、複数のモータを制御し、前記変換回路は、少なくとも前記平滑コンデンサ及び前記スイッチング回路を、複数の前記モータごとに備え、複数の前記平滑コンデンサが前記バイパス回路を介して前記直流電源回路に接続されている。
In the electric circuit of the injection molding machine, the motor driver controls a plurality of motors, the conversion circuit includes at least the smoothing capacitor and the switching circuit for each of the plurality of the motors, and the plurality of the smoothing capacitors are provided. It is connected to the DC power supply circuit via the bypass circuit.
この構成によれば、商用交流電源の瞬時停電時に、複数の平滑コンデンサに蓄電された電荷による電流が直流電源回路に供給されるので、射出成形機の運転を継続できる頻度が一層高くなる。
According to this configuration, in the event of a momentary power failure of the commercial AC power supply, the current due to the electric charges stored in the plurality of smoothing capacitors is supplied to the DC power supply circuit, so that the operation of the injection molding machine can be continued more frequently.
上記射出成形機の電気回路において、前記直流電源回路は、M個の直流電源回路のうちの1つであり(但しMは2以上の自然数)、前記変換回路は、N個の変換回路のうちの1つであり(但しNは2以上の自然数)、前記N個の前記平滑コンデンサが前記バイパス回路を介して前記M個の前記直流電源回路に接続されており、前記N個は前記M個よりも多くてもよい。
In the electric circuit of the injection molding machine, the DC power supply circuit is one of M DC power supply circuits (where M is a natural number of 2 or more), and the conversion circuit is among N conversion circuits. (However, N is a natural number of 2 or more), the N smoothing capacitors are connected to the M DC power supply circuits via the bypass circuit, and the N are the M. May be more.
この構成によれば、商用交流電源の瞬時停電時に、N個の平滑コンデンサに蓄電された電荷による電流が、N個よりも少ないM個の直流電源回路に供給されるので、射出成形機の運転を継続できる頻度が一層高くなる。
According to this configuration, in the event of a momentary power failure of a commercial AC power supply, the current due to the electric charge stored in the N smoothing capacitors is supplied to the M DC power supply circuits, which are less than N, so that the injection molding machine can be operated. The frequency with which you can continue is even higher.
本発明によれば、簡単な回路構成で、瞬時停電時に射出成形機の運転を継続できる頻度を高めることができる射出成形機の電気回路を提供できる。
According to the present invention, it is possible to provide an electric circuit of an injection molding machine capable of increasing the frequency with which the operation of the injection molding machine can be continued in the event of a momentary power failure with a simple circuit configuration.
(第1実施形態)
以下、第1実施形態における射出成形機及びその電気回路について、図面を参照して説明する。 (First Embodiment)
Hereinafter, the injection molding machine and its electric circuit according to the first embodiment will be described with reference to the drawings.
以下、第1実施形態における射出成形機及びその電気回路について、図面を参照して説明する。 (First Embodiment)
Hereinafter, the injection molding machine and its electric circuit according to the first embodiment will be described with reference to the drawings.
まず、第1実施形態に係る電動油圧式の射出成形機の概略構成について、図1を参照して説明する。電動油圧式の射出成形機10は、サーボモータ36により油圧ポンプ34を駆動して供給される作動油により駆動される。
First, the schematic configuration of the electro-hydraulic injection molding machine according to the first embodiment will be described with reference to FIG. The electro-hydraulic injection molding machine 10 is driven by hydraulic oil supplied by driving a hydraulic pump 34 by a servomotor 36.
図1に示すように、射出成形機10は、射出装置11と型締装置12とを備える。射出装置11は、加熱筒21と、加熱筒21の内部に挿入されたスクリュー22と、加熱筒21の後端に配設され、スクリュー22を駆動するスクリュー駆動部23とを備える。加熱筒21は、加熱筒21の前端に設けられた射出ノズル21nと、加熱筒21の後部に設けられたホッパ21hと、を含む。スクリュー駆動部23は、片ロッドタイプの射出ラム24aを内蔵する射出シリンダ(油圧シリンダ)24を備える。射出シリンダ24の前方に突出するラムロッド24bはスクリュー22の後端に結合される。また、射出ラム24aの後端には、射出シリンダ24に取付けられた計量モータ(オイルモータ)25のシャフトがスプライン結合される。射出装置11は、その下部に、射出装置11を進退移動させて金型15に対するノズルタッチ又はその解除を行う移動シリンダ26を備える。また、加熱筒21の外周面には、複数のヒータ27が巻回状態で取着されている。射出装置11は、射出ノズル21nを金型15にノズルタッチし、金型15のキャビティ内に溶融(可塑化)した樹脂(図示略)を射出充填する。
As shown in FIG. 1, the injection molding machine 10 includes an injection device 11 and a mold clamping device 12. The injection device 11 includes a heating cylinder 21, a screw 22 inserted inside the heating cylinder 21, and a screw driving unit 23 arranged at the rear end of the heating cylinder 21 to drive the screw 22. The heating cylinder 21 includes an injection nozzle 21n provided at the front end of the heating cylinder 21 and a hopper 21h provided at the rear portion of the heating cylinder 21. The screw drive unit 23 includes an injection cylinder (hydraulic cylinder) 24 containing a single rod type injection ram 24a. The ram rod 24b projecting forward of the injection cylinder 24 is coupled to the rear end of the screw 22. Further, a shaft of a metering motor (oil motor) 25 attached to the injection cylinder 24 is spline-coupled to the rear end of the injection ram 24a. The injection device 11 includes a moving cylinder 26 below the injection device 11 that moves the injection device 11 forward and backward to touch or release the nozzle on the mold 15. Further, a plurality of heaters 27 are attached to the outer peripheral surface of the heating cylinder 21 in a wound state. The injection device 11 touches the mold 15 with the injection nozzle 21n, and injects and fills the molten (plasticized) resin (not shown) in the cavity of the mold 15.
一方、型締装置12は、型締シリンダ(油圧シリンダ)28の駆動ラム28aにより可動型15mを変位させる直圧方式の油圧式型締装置を用いる。型締装置12は、位置が固定された固定盤29と、固定盤29と型締シリンダ28間に架設された複数のタイバー30にスライド自在に装填された可動盤31とを有する。この可動盤31には型締シリンダ28から前方に突出したラムロッド28bの先端が固定される。また、固定盤29には固定型15cが取付けられ、可動盤31には可動型15mが取付けられる。この固定型15cと可動型15mは金型15を構成する。これにより、型締シリンダ28は金型15に対する型開閉及び型締を行う。なお、型締装置12は、金型15を開いた際に、可動型15mに付着した成形品(図示略)の突き出しを行うエジェクタシリンダ32を備える。
On the other hand, the mold clamping device 12 uses a direct pressure type hydraulic mold clamping device that displaces the movable mold 15 m by the drive ram 28a of the mold clamping cylinder (hydraulic cylinder) 28. The mold clamping device 12 has a fixed platen 29 whose position is fixed, and a movable platen 31 which is slidably loaded into a plurality of tie bars 30 erected between the fixed platen 29 and the mold clamping cylinder 28. The tip of the ram rod 28b protruding forward from the mold clamping cylinder 28 is fixed to the movable platen 31. Further, a fixed mold 15c is attached to the fixed plate 29, and a movable mold 15 m is attached to the movable plate 31. The fixed mold 15c and the movable mold 15m form a mold 15. As a result, the mold clamping cylinder 28 opens and closes the mold 15 and clamps the mold. The mold clamping device 12 includes an ejector cylinder 32 that projects a molded product (not shown) adhering to the movable mold 15 m when the mold 15 is opened.
他方、射出成形機10は、油圧回路33を備える。油圧回路33は、油圧駆動源となる油圧ポンプ34及び切換バルブ回路35を備える。射出成形機10は、油圧ポンプ34を回転駆動するモータの一例としてのサーボモータ36及びサーボモータ36の回転数を検出するロータリエンコーダ37を備える。油圧ポンプ34は、例えば、吐出容量可変な斜板型ピストンポンプである。なお、油圧ポンプ34は、吐出容量可変な他の方式の油圧ポンプでもよいし、吐出容量が一定の油圧ポンプでもよい。
On the other hand, the injection molding machine 10 includes a hydraulic circuit 33. The hydraulic circuit 33 includes a hydraulic pump 34 as a hydraulic drive source and a switching valve circuit 35. The injection molding machine 10 includes a servomotor 36 as an example of a motor that rotationally drives the hydraulic pump 34, and a rotary encoder 37 that detects the rotation speed of the servomotor 36. The hydraulic pump 34 is, for example, a swash plate type piston pump having a variable discharge capacity. The hydraulic pump 34 may be another type of hydraulic pump having a variable discharge capacity, or a hydraulic pump having a constant discharge capacity.
油圧ポンプ34の吸入口は、オイルタンク38に接続され、油圧ポンプ34の吐出口は、切換バルブ回路35の一次側に接続されている。さらに切換バルブ回路35の二次側は、射出成形機10における射出シリンダ24、計量モータ25、型締シリンダ28、エジェクタシリンダ32、移動シリンダ26及び他の油圧式のアクチュエータに接続されている。切換バルブ回路35は、射出シリンダ24、計量モータ25、型締シリンダ28、エジェクタシリンダ32、移動シリンダ26及び油圧式の他のアクチュエータに対する作動油の供給、停止、排出に係わる切換機能を有する電磁切換バルブ(図示略)を備える。
The suction port of the hydraulic pump 34 is connected to the oil tank 38, and the discharge port of the hydraulic pump 34 is connected to the primary side of the switching valve circuit 35. Further, the secondary side of the switching valve circuit 35 is connected to the injection cylinder 24, the measuring motor 25, the mold clamping cylinder 28, the ejector cylinder 32, the moving cylinder 26 and other hydraulic actuators in the injection molding machine 10. The switching valve circuit 35 is an electromagnetic switching having a switching function related to supply, stop, and discharge of hydraulic oil to the injection cylinder 24, the measuring motor 25, the mold clamping cylinder 28, the ejector cylinder 32, the moving cylinder 26, and other hydraulic actuators. It is equipped with a valve (not shown).
サーボモータ36の回転数が可変制御され、油圧ポンプ34の吐出流量及び吐出圧力が制御されることで、上述した射出シリンダ24、計量モータ25、型締シリンダ28、エジェクタシリンダ32及び移動シリンダ26等が駆動制御される。これにより、射出成形機10の成形サイクルにおける各工程が制御される。この射出成形機10は、サーボモータ36及びヒータ27等を制御する制御系回路を含む図2に示す電気回路40を備える。
By variably controlling the rotation speed of the servomotor 36 and controlling the discharge flow rate and discharge pressure of the hydraulic pump 34, the above-mentioned injection cylinder 24, measuring motor 25, mold clamping cylinder 28, ejector cylinder 32, moving cylinder 26, etc. Is driven and controlled. As a result, each step in the molding cycle of the injection molding machine 10 is controlled. The injection molding machine 10 includes an electric circuit 40 shown in FIG. 2, which includes a control system circuit for controlling a servomotor 36, a heater 27, and the like.
図2に示すように、電気回路40は、商用交流電源17から供給される所定電圧の交流を入力し、サーボモータ36を駆動制御するモータドライバの一例としてのサーボドライバ50と、商用交流電源17から供給される所定電圧の交流を、供給電圧の一例である制御電源電圧V0の直流に変換する直流電源回路60とを備える。また、電気回路40は、商用交流電源17からの電力でヒータ27を加熱制御するヒータ回路70を備える。さらに、電気回路40は、直流電源回路60と電気的に接続された複数の電源回路44,45,46,47と、メインコントローラ41とを備える。また、サーボドライバ50は、サーボコントローラ51を備える。直流電源回路60が出力する制御電源電圧V0の直流は、各電源回路44,45,46,47を介して、メインコントローラ41、センサ42、電動式のアクチュエータ43、切換バルブ回路35及びサーボコントローラ51に、それぞれ供給先で必要な所定電圧に降圧等されて出力される。
As shown in FIG. 2, the electric circuit 40 includes a servo driver 50 as an example of a motor driver that inputs an AC of a predetermined voltage supplied from a commercial AC power supply 17 to drive and control the servo motor 36, and a commercial AC power supply 17. It is provided with a DC power supply circuit 60 that converts an alternating current of a predetermined voltage supplied from the above into a direct current having a control power supply voltage V0, which is an example of the supply voltage. Further, the electric circuit 40 includes a heater circuit 70 that heats and controls the heater 27 with electric power from the commercial AC power supply 17. Further, the electric circuit 40 includes a plurality of power supply circuits 44, 45, 46, 47 electrically connected to the DC power supply circuit 60, and a main controller 41. Further, the servo driver 50 includes a servo controller 51. The DC of the control power supply voltage V0 output by the DC power supply circuit 60 is transmitted through the power supply circuits 44, 45, 46, 47 to the main controller 41, the sensor 42, the electric actuator 43, the switching valve circuit 35, and the servo controller 51. The voltage is stepped down to a predetermined voltage required at the supply destination and output.
メインコントローラ41は、センサ42と電気的に接続され、センサ42から入力する検出結果に基づきサーボコントローラ51、電動式のアクチュエータ43及び切換バルブ回路35の駆動回路に、個別に制御信号を出力する。サーボコントローラ51はメインコントローラ41から入力した制御信号に基づきサーボドライバ50を構成する図3に示す変換回路52を介して、サーボモータ36に供給される3相の電圧及び周波数を制御する。これにより、サーボドライバ50は、サーボモータ36の駆動・停止、駆動中の回転速度を制御する。また、ヒータ回路70は、メインコントローラ41から入力する温度制御信号に基づき複数のヒータ27に供給する電流を個別にオン・オフする温度制御回路により構成される。
The main controller 41 is electrically connected to the sensor 42, and outputs control signals individually to the drive circuits of the servo controller 51, the electric actuator 43, and the switching valve circuit 35 based on the detection result input from the sensor 42. The servo controller 51 controls the three-phase voltage and frequency supplied to the servomotor 36 via the conversion circuit 52 shown in FIG. 3 that constitutes the servo driver 50 based on the control signal input from the main controller 41. As a result, the servo driver 50 controls the drive / stop of the servomotor 36 and the rotation speed during the drive. Further, the heater circuit 70 is composed of a temperature control circuit that individually turns on / off the currents supplied to the plurality of heaters 27 based on the temperature control signals input from the main controller 41.
次に、図3を参照して、電気回路40の主要な構成について詳細に説明する。なお、図3では、メインコントローラ41、サーボコントローラ51の一部、センサ42、電動式のアクチュエータ43、切換バルブ回路35及び複数の電源回路44~47は、図示を省略している。図3では、サーボコントローラ51は、その一部である回生制御回路57のみ示している。
Next, with reference to FIG. 3, the main configuration of the electric circuit 40 will be described in detail. In FIG. 3, the main controller 41, a part of the servo controller 51, the sensor 42, the electric actuator 43, the switching valve circuit 35, and the plurality of power supply circuits 44 to 47 are not shown. In FIG. 3, the servo controller 51 shows only the regenerative control circuit 57, which is a part thereof.
電気回路40は、前述のとおり、サーボドライバ50、直流電源回路60及びヒータ回路70を備える。商用交流電源17の所定電圧は、例えば300~500Vの範囲内の所定値である。本例では、一例として所定電圧は440Vである。
As described above, the electric circuit 40 includes a servo driver 50, a DC power supply circuit 60, and a heater circuit 70. The predetermined voltage of the commercial AC power supply 17 is, for example, a predetermined value in the range of 300 to 500 V. In this example, the predetermined voltage is 440V as an example.
サーボドライバ50は、サーボコントローラ51により制御される変換回路52を備える。変換回路52は、商用交流電源17から入力した所定電圧の交流をサーボモータ36の制御に用いられる電圧及び周波数に変換する。変換回路52は、3相交流を供給する商用交流電源17と接続された整流器の一例としてのコンバータ部53、回生回路54、平滑コンデンサ55及びスイッチング回路の一例としてのインバータ部56を備え、この順で接続されている。変換回路52は、高電位側電源ライン(以下、「Pライン」という。)Lpと、低電位側電源ライン(以下、「Nライン」という。)Lnとを有する。
The servo driver 50 includes a conversion circuit 52 controlled by the servo controller 51. The conversion circuit 52 converts the AC of a predetermined voltage input from the commercial AC power supply 17 into the voltage and frequency used for controlling the servomotor 36. The conversion circuit 52 includes a converter unit 53 as an example of a rectifier connected to a commercial AC power supply 17 that supplies a three-phase AC, a regenerative circuit 54, a smoothing capacitor 55, and an inverter unit 56 as an example of a switching circuit, in this order. It is connected with. The conversion circuit 52 has a high potential side power supply line (hereinafter referred to as “P line”) Lp and a low potential side power supply line (hereinafter referred to as “N line”) Ln.
コンバータ部53は、ブリッジ接続された6つのダイオードD1を有し、商用交流電源17から入力される所定電圧の交流を所定電圧の直流に整流する。6つのダイオードD1は、PラインLpとNラインLnとの間に、同じ向きに直列に接続された2つのダイオードD1の3組が並列に接続されるように配置されている。各組において、直列に接続された2つのダイオードD1の間に商用交流電源17からの3相交流の相R,T,Sの三線のうちの対応する線が接続されている。このため、PラインLpが所定の高電位に印加され、NラインLnが所定の低電位に印加される。
The converter unit 53 has six diodes D1 connected by a bridge, and rectifies an alternating current of a predetermined voltage input from the commercial AC power supply 17 to a direct current of a predetermined voltage. The six diodes D1 are arranged so that three sets of two diodes D1 connected in series in the same direction are connected in parallel between the P line Lp and the N line Ln. In each set, the corresponding wires of the three phases R, T, and S of the three-phase AC from the commercial AC power supply 17 are connected between the two diodes D1 connected in series. Therefore, the P line Lp is applied to a predetermined high potential, and the N line Ln is applied to a predetermined low potential.
平滑コンデンサ55は、コンバータ部53により交流が整流された脈流を平滑化する。
The smoothing capacitor 55 smoothes the pulsating current whose alternating current is rectified by the converter unit 53.
インバータ部56は、トランジスタQ1とダイオードD2とが逆並列に接続されたアームを6つ備える。6つのアームは、PラインLpとNラインLn間に直列に接続された2つのアームの3組が並列に接続されるように配置されている。サーボモータ36には、インバータ部56における2つずつ直列に接続された3組のトランジスタQ1の間にサーボモータ36の3相U,V,Wの端子がそれぞれ接続されている。インバータ部56は、サーボコントローラ51により制御される。すなわち、サーボコントローラ51は、6つのトランジスタQ1のオン・オフを、例えばPWM(Pulse Width Modulation)制御により切り換えることで、サーボモータ36に供給する電圧及び周波数を制御する。これによりサーボモータ36の駆動・停止及び回転速度が制御される。
The inverter unit 56 includes six arms in which the transistor Q1 and the diode D2 are connected in antiparallel. The six arms are arranged so that three sets of two arms connected in series between the P line Lp and the N line Ln are connected in parallel. In the servomotor 36, the terminals of the three phases U, V, and W of the servomotor 36 are connected between three sets of transistors Q1 connected in series by two in the inverter unit 56, respectively. The inverter unit 56 is controlled by the servo controller 51. That is, the servo controller 51 controls the voltage and frequency supplied to the servomotor 36 by switching on / off of the six transistors Q1 by, for example, PWM (Pulse Width Modulation) control. As a result, the drive / stop and rotation speed of the servomotor 36 are controlled.
メインコントローラ41(図2参照)は、各種のセンサ42の検出結果に基づき油圧回路33(図1参照)における作動油が必要なときにサーボモータ36を駆動し、各種のセンサ42の検知結果に基づき油圧回路33における作動油が不要なときにサーボモータ36の駆動を停止させる。サーボモータ36は減速過程で発電し回生電流を発生する。サーボモータ36が発電した電力は、平滑コンデンサ55に蓄電される。
The main controller 41 (see FIG. 2) drives the servomotor 36 when hydraulic oil is required in the hydraulic circuit 33 (see FIG. 1) based on the detection results of the various sensors 42, and the detection results of the various sensors 42 are obtained. Based on this, the drive of the servomotor 36 is stopped when the hydraulic oil in the hydraulic circuit 33 is not required. The servomotor 36 generates electricity in the deceleration process to generate a regenerative current. The electric power generated by the servomotor 36 is stored in the smoothing capacitor 55.
回生回路54は、PラインLpとNラインLnとの間に接続された、抵抗R1、ダイオードD3及びトランジスタQ2を備える。抵抗R1、ダイオードD3は並列に接続され、抵抗R1の低電圧側の端子がトランジスタQ2のコレクタ端子に接続されている。トランジスタQ2のエミッタ端子がNラインLnに接続されている。回生制御回路57は、PラインLp上のP端子とNラインLn上のN端子との間の電圧を入力する。回生制御回路57は、入力するP端子とN端子との間の電圧値が閾値以下のときにトランジスタQ2をオフし、閾値を超えるとトランジスタQ2をオンする。トランジスタQ2がオフのときは、サーボモータ36の回生電流が平滑コンデンサ55に蓄電される。トランジスタQ2がオンのときは、サーボモータ36の回生電流は抵抗R1で熱として消費される。
The regenerative circuit 54 includes a resistor R1, a diode D3, and a transistor Q2 connected between the P line Lp and the N line Ln. The resistor R1 and the diode D3 are connected in parallel, and the terminal on the low voltage side of the resistor R1 is connected to the collector terminal of the transistor Q2. The emitter terminal of the transistor Q2 is connected to the N line Ln. The regeneration control circuit 57 inputs a voltage between the P terminal on the P line Lp and the N terminal on the N line Ln. The regeneration control circuit 57 turns off the transistor Q2 when the voltage value between the input P terminal and the N terminal is equal to or less than the threshold value, and turns on the transistor Q2 when the voltage value exceeds the threshold value. When the transistor Q2 is off, the regenerative current of the servomotor 36 is stored in the smoothing capacitor 55. When the transistor Q2 is on, the regenerative current of the servomotor 36 is consumed as heat by the resistor R1.
一方、直流電源回路60は、第1整流回路の一例である整流回路61、平滑用のコンデンサ62、スイッチング回路63、絶縁トランス64、第2整流回路の一例である整流回路65及び平滑回路66を備える。絶縁トランス64は、例えば、高周波絶縁トランスである。
On the other hand, the DC power supply circuit 60 includes a rectifier circuit 61 which is an example of the first rectifier circuit, a smoothing capacitor 62, a switching circuit 63, an isolation transformer 64, and a rectifier circuit 65 and a smoothing circuit 66 which are examples of the second rectifier circuit. Be prepared. The isolation transformer 64 is, for example, a high frequency isolation transformer.
整流回路61は、ブリッジ接続された4つのダイオードD4を有し、商用交流電源17から入力される2相間の所定電圧の交流を所定電圧の直流に整流する。4つのダイオードD4は、高電位側電源ラインLaと低電位側電源ラインLbとの間に、同じ向きに直列で接続された2つのダイオードD4の2組が並列に接続されるように配置されている。各組において、直列に接続された2つのダイオードD4の間に商用交流電源17からの3相交流のうち2相の二線のうちの対応する線が接続されている。このため、高電位側電源ラインLaが所定の高電位に印加され、低電位側電源ラインLbが所定の低電位に印加される。
The rectifier circuit 61 has four diodes D4 connected by a bridge, and rectifies an alternating current of a predetermined voltage between two phases input from a commercial AC power supply 17 to a direct current of a predetermined voltage. The four diodes D4 are arranged so that two sets of two diodes D4 connected in series in the same direction are connected in parallel between the high potential side power supply line La and the low potential side power supply line Lb. There is. In each set, the corresponding wire of the two phases of the three-phase alternating current from the commercial AC power supply 17 is connected between the two diodes D4 connected in series. Therefore, the high potential side power supply line La is applied to a predetermined high potential, and the low potential side power supply line Lb is applied to a predetermined low potential.
平滑用のコンデンサ62は、整流回路61により交流が整流された脈流を平滑化する。
The smoothing capacitor 62 smoothes the pulsating current whose alternating current is rectified by the rectifier circuit 61.
スイッチング回路63は、トランジスタQ3とダイオードD5とが逆並列に接続されたアームを4つ備える。4つのアームは、高電位側電源ラインLaと低電位側電源ラインLb間に直列に接続された2つのアームの2組が並列に接続されるように配置されている。2つずつが直列に接続された組ごとの2つのトランジスタQ3の間のそれぞれには、絶縁トランス64の一次側コイルの2つの端子がそれぞれ接続されている。4つのトランジスタQ3のベース端子は電圧制御回路69に接続されている。電圧制御回路69は、PWM制御により4つのトランジスタQ3のオン・オフを切り換える制御を行うことにより、絶縁トランス64の一次側コイルに出力される電圧及び周波数を制御する。
The switching circuit 63 includes four arms in which the transistor Q3 and the diode D5 are connected in antiparallel. The four arms are arranged so that two sets of two arms connected in series between the high potential side power supply line La and the low potential side power supply line Lb are connected in parallel. Two terminals of the primary coil of the isolation transformer 64 are connected to each of the two transistors Q3 in each set in which two are connected in series. The base terminals of the four transistors Q3 are connected to the voltage control circuit 69. The voltage control circuit 69 controls the voltage and frequency output to the primary coil of the isolation transformer 64 by controlling the four transistors Q3 to be turned on and off by PWM control.
整流回路65は、ブリッジ接続された4つのダイオードD6を有し、絶縁トランス64の二次側コイルから入力される所定電圧及び所定周波数の電流を直流に整流する。4つのダイオードD6は、高電位側電源ラインLcと低電位側電源ラインLdとの間に、同じ向きに直列で接続された2つのダイオードD6の2組が並列に接続されるように配置されている。各組において、直列に接続された2つのダイオードD6の間に絶縁トランス64の二次側コイルの2つの端子のうちの対応する端子が接続されている。このため、高電位側電源ラインLcが所定の高電位に印加され、低電位側電源ラインLdが所定の低電位に印加される。
The rectifier circuit 65 has four diodes D6 connected by a bridge, and rectifies a predetermined voltage and a current of a predetermined frequency input from the secondary coil of the isolation transformer 64 to direct current. The four diodes D6 are arranged so that two sets of two diodes D6 connected in series in the same direction are connected in parallel between the high potential side power supply line Lc and the low potential side power supply line Ld. There is. In each set, the corresponding terminal of the two terminals of the secondary coil of the isolation transformer 64 is connected between the two diodes D6 connected in series. Therefore, the high potential side power supply line Lc is applied to a predetermined high potential, and the low potential side power supply line Ld is applied to a predetermined low potential.
平滑回路66は、高電位側電源ラインLcに直列に接続されたコイル67と、高電位側電源ラインLcと低電位側電源ラインLdとの間に接続された平滑用のコンデンサ68とを備える。このため、高電位側電源ラインLcは高電位の+Vボルトに印加され、低電位側電源ラインLdは低電位の-Vボルト(例えば0V)に印加される。よって、直流電源回路60は、高電位側電源ラインLc上の端子T1と低電位側電源ラインLd上の端子T2との間の電圧を、制御電源電圧V0として出力する。
The smoothing circuit 66 includes a coil 67 connected in series with the high potential side power supply line Lc, and a smoothing capacitor 68 connected between the high potential side power supply line Lc and the low potential side power supply line Ld. Therefore, the high potential side power supply line Lc is applied to the high potential + V volt, and the low potential side power supply line Ld is applied to the low potential −V volt (for example, 0V). Therefore, the DC power supply circuit 60 outputs the voltage between the terminal T1 on the high potential side power supply line Lc and the terminal T2 on the low potential side power supply line Ld as the control power supply voltage V0.
電圧制御回路69は、2つの端子T1,T2間の電圧を入力し、その入力電圧が制御電源電圧V0に対して許容範囲を超える値であるときに、4つのトランジスタQ3のオン・オフをPWM制御により切り換える。これにより電圧制御回路69は、絶縁トランス64の一次側コイルに出力される電圧及び周波数を制御し、端子T1,T2間の電圧が目標の制御電源電圧V0になるよう調整する。
The voltage control circuit 69 inputs the voltage between the two terminals T1 and T2, and when the input voltage is a value exceeding the permissible range with respect to the control power supply voltage V0, PWMs the on / off of the four transistors Q3. Switch by control. As a result, the voltage control circuit 69 controls the voltage and frequency output to the primary coil of the isolation transformer 64, and adjusts the voltage between the terminals T1 and T2 to be the target control power supply voltage V0.
ここで、平滑コンデンサ55の容量をC1、平滑用のコンデンサ62の容量をC2、平滑用のコンデンサ68の容量をC3とする。容量C1,C2,C3の大小関係は、C1>C2>C3である。サーボドライバ50内の平滑コンデンサ55は、モータ制御に使用されるため大容量が必要である。これに対して直流電源回路60内の平滑用のコンデンサ62,68は、平滑コンデンサ55に比べ小容量で足りる。
Here, the capacity of the smoothing capacitor 55 is C1, the capacity of the smoothing capacitor 62 is C2, and the capacity of the smoothing capacitor 68 is C3. The magnitude relationship between the capacities C1, C2, and C3 is C1> C2> C3. Since the smoothing capacitor 55 in the servo driver 50 is used for motor control, a large capacity is required. On the other hand, the smoothing capacitors 62 and 68 in the DC power supply circuit 60 need to have a smaller capacity than the smoothing capacitor 55.
第1実施形態では、サーボドライバ50と直流電源回路60との間は、逆流防止回路81を含むバイパス回路80を介して電気的に接続されている。逆流防止回路81は、サーボドライバ50を構成する平滑コンデンサ55に蓄電された電圧に基づく電流が、直流電源回路60に供給する方向に流れることを許容し、かつその反対の方向に流れる電流を阻止する。詳しくは、バイパス回路80は、サーボドライバ50側のPラインLpと直流電源回路60側の高電位側電源ラインLaとを接続する第1バイパスラインL1と、サーボドライバ50側のNラインLnと直流電源回路60側の低電位側電源ラインLbとを接続する第2バイパスラインL2とを備える。そして、逆流防止回路81は、第1バイパスラインL1上に設けられ、サーボドライバ50から直流電源回路60へ向かう方向への電流を許容するとともにその逆方向の電流を阻止する第1ダイオード82を備える。
In the first embodiment, the servo driver 50 and the DC power supply circuit 60 are electrically connected via a bypass circuit 80 including a backflow prevention circuit 81. The backflow prevention circuit 81 allows the current based on the voltage stored in the smoothing capacitor 55 constituting the servo driver 50 to flow in the direction of being supplied to the DC power supply circuit 60, and blocks the current flowing in the opposite direction. do. Specifically, the bypass circuit 80 includes a first bypass line L1 that connects the P line Lp on the servo driver 50 side and the high potential side power supply line La on the DC power supply circuit 60 side, and an N line Ln on the servo driver 50 side and DC. A second bypass line L2 for connecting to the low potential side power supply line Lb on the power supply circuit 60 side is provided. The backflow prevention circuit 81 is provided on the first bypass line L1 and includes a first diode 82 that allows a current in the direction from the servo driver 50 toward the DC power supply circuit 60 and blocks the current in the reverse direction. ..
次に、第1実施形態における射出成形機10の電気回路40の作用について説明する。
Next, the operation of the electric circuit 40 of the injection molding machine 10 in the first embodiment will be described.
商用交流電源17の瞬時停電が発生すると、サーボドライバ50、直流電源回路60及びヒータ回路70への所定電圧の交流の供給が停電時間Tpcの間に亘り一瞬停止する。瞬時停電開始後、所定時間の間は、平滑コンデンサ55に蓄電された電荷によりPラインLpの電位が高電位に保たれる。一方、瞬時停電時は、平滑コンデンサ55と平滑用のコンデンサ62との容量の違いから、直流電源回路60の高電位側電源ラインLaの高電位の方がPラインLpの高電位よりも先に降下する。その結果、平滑コンデンサ55に蓄電された電荷により、PラインLpからバイパス回路80を介して直流電源回路60の高電位側電源ラインLaへ電流が流れ、平滑用のコンデンサ62が蓄電される。これにより直流電源回路60では高電位側電源ラインLaの電位が高電位に保たれる時間が延長される。その結果、直流電源回路60が瞬時停電開始後に制御電源電圧V0を出力し続けられる時間が延長される。
When a momentary power failure occurs in the commercial AC power supply 17, the supply of AC of a predetermined voltage to the servo driver 50, the DC power supply circuit 60, and the heater circuit 70 is momentarily stopped during the power failure time Tpc. After the start of the instantaneous power failure, the potential of the P line Lp is maintained at a high potential by the electric charge stored in the smoothing capacitor 55 for a predetermined time. On the other hand, in the event of an instantaneous power failure, the high potential of the high potential side power supply line La of the DC power supply circuit 60 precedes the high potential of the P line Lp due to the difference in capacitance between the smoothing capacitor 55 and the smoothing capacitor 62. Descent. As a result, the electric charge stored in the smoothing capacitor 55 causes a current to flow from the P line Lp to the high potential side power supply line La of the DC power supply circuit 60 via the bypass circuit 80, and the smoothing capacitor 62 is stored. As a result, in the DC power supply circuit 60, the time for which the potential of the high potential side power supply line La is maintained at a high potential is extended. As a result, the time during which the DC power supply circuit 60 can continue to output the control power supply voltage V0 after the start of the instantaneous power failure is extended.
また、バイパス回路80を介して直流電源回路60の高電位側電源ラインLaへ流れた電流は、整流回路61のダイオードD4により商用交流電源17側へ流れることが阻止されるので、電流がヒータ回路70へ流れて消費されることが回避される。このため、バイパス回路80からの電流は、直流電源回路60の高電位側電源ラインLaを高電位に保つために効率よく使用される。この点からも、直流電源回路60が瞬時停電開始から制御電源電圧V0を出力し続けられる時間を延長できる。
Further, the current flowing to the high potential side power supply line La of the DC power supply circuit 60 via the bypass circuit 80 is prevented from flowing to the commercial AC power supply 17 side by the diode D4 of the rectifying circuit 61, so that the current flows to the heater circuit. It is avoided that it flows to 70 and is consumed. Therefore, the current from the bypass circuit 80 is efficiently used to keep the high potential side power supply line La of the DC power supply circuit 60 at a high potential. From this point as well, the time during which the DC power supply circuit 60 can continue to output the control power supply voltage V0 from the start of the instantaneous power failure can be extended.
なお、商用交流電源17の瞬時停電がなく射出成形機10が正常運転しているときは、逆流防止回路81により、直流電源回路60からサーボドライバ50へバイパス回路80を介して電流が流れることがない。このため、直流電源回路60は、安定した制御電源電圧V0の直流を出力できる。
When the injection molding machine 10 is operating normally without a momentary power failure of the commercial AC power supply 17, a current may flow from the DC power supply circuit 60 to the servo driver 50 via the bypass circuit 80 by the backflow prevention circuit 81. No. Therefore, the DC power supply circuit 60 can output a DC with a stable control power supply voltage V0.
ところで、商用交流電源17の電源事情の悪い国や地域で発生する瞬時停電の停電時間Tpcは、数10ミリ秒~100ミリ秒未満の範囲である場合がほとんどである。直流電源回路60における平滑用のコンデンサ62の容量は瞬時停電時の停電時間Tpcに対して十分ではない。しかし、サーボドライバ50の変換回路52が有する大容量の平滑コンデンサ55に蓄電された電荷による電流が、バイパス回路80を介して直流電源回路60に流れるため、直流電源回路60の高電位側電源ラインLaの電位が高電位に保たれる。そのため、瞬時停電の間、高電位側電源ラインLaが必要な高電位に保持される。
By the way, in most cases, the power outage time Tpc of an instantaneous power outage that occurs in a country or region where the power supply condition of the commercial AC power supply 17 is poor is in the range of several tens of milliseconds to less than 100 milliseconds. The capacity of the smoothing capacitor 62 in the DC power supply circuit 60 is not sufficient for the power failure time Tpc at the time of a momentary power failure. However, since the current due to the electric charge stored in the large-capacity smoothing capacitor 55 included in the conversion circuit 52 of the servo driver 50 flows to the DC power supply circuit 60 via the bypass circuit 80, the high potential side power supply line of the DC power supply circuit 60 The potential of La is maintained at a high potential. Therefore, the high potential side power supply line La is maintained at the required high potential during the instantaneous power failure.
この結果、直流電源回路60は、瞬時停電時に復電するまでの期間に、必要な制御電源電圧V0を出力できる。そのため、メインコントローラ41が実行中の制御を強制的に停止することがなく、射出成形機10の強制停止が回避される。この結果、瞬時停電時に射出成形機10の運転を継続できる頻度が高まる。例えば、瞬時停電時に射出成形機10が強制停止した場合、射出成形機10の運転を再開するために電源を入れ直すなどの復旧作業に時間を要し、射出成形機10の生産性が低減する。特に、作業者が射出成形機10の強制停止に気付かなければ、射出成形機10が停止したまま放置されるので、生産性が大幅に低下する。第1実施形態の射出成形機10は、瞬時停電時に射出成形機10の運転を継続できるので、瞬時停電に起因する生産性の低下を極力抑制できる。
As a result, the DC power supply circuit 60 can output the required control power supply voltage V0 during the period until the power is restored in the event of a momentary power failure. Therefore, the control during execution by the main controller 41 is not forcibly stopped, and the forcible stop of the injection molding machine 10 is avoided. As a result, the frequency with which the injection molding machine 10 can be continued in the event of a momentary power failure increases. For example, when the injection molding machine 10 is forcibly stopped at the time of a momentary power failure, it takes time for restoration work such as turning the power off and then on again in order to restart the operation of the injection molding machine 10, and the productivity of the injection molding machine 10 is reduced. In particular, if the operator does not notice the forced stop of the injection molding machine 10, the injection molding machine 10 is left stopped, so that the productivity is significantly reduced. Since the injection molding machine 10 of the first embodiment can continue the operation of the injection molding machine 10 at the time of a momentary power failure, the decrease in productivity due to the momentary power failure can be suppressed as much as possible.
第1実施形態の電気回路40の評価試験を行った。射出成形機10の成形サイクルのうち負荷の大きな工程の1つである型開工程において、100ミリ秒前後の瞬時停電を強制的に発生させることで、射出成形機10の瞬時停電時の効果を評価した。射出成形機10の自動運転中の型開工程の途中に元電源スイッチを瞬間的にOFFしてすぐONに戻す操作を行うことで、模擬的に瞬時停電を発生させた。なお、実際の瞬時停電時の停電時間Tpcは、ほとんど場合、100ミリ秒未満である。
An evaluation test of the electric circuit 40 of the first embodiment was performed. In the mold opening process, which is one of the processes with a large load in the molding cycle of the injection molding machine 10, a momentary power failure of about 100 milliseconds is forcibly generated, so that the effect of the injection molding machine 10 at the time of a momentary power failure can be obtained. evaluated. An instantaneous power failure was simulated by performing an operation of momentarily turning off the original power switch and immediately returning it to ON during the mold opening process during the automatic operation of the injection molding machine 10. In most cases, the power failure time Tpc at the time of an actual instantaneous power failure is less than 100 milliseconds.
図4は、バイパス回路80を備えない比較例の電気回路の評価結果を示すグラフである。また、図5は、バイパス回路80を備える実施例の電気回路40の評価結果を示すグラフである。図4、図5は、電気回路40における4つの測定箇所で測定した電圧を示す。すなわち、測定した電圧は、交流入力電圧Vac、サーボ電源電圧Vpn、モータ電圧Vm及び制御電源電圧Vdcである。交流入力電圧Vacは、商用交流電源17から入力する電圧である。サーボ電源電圧Vpnは、PラインLpとNラインLn間の電圧である。モータ電圧Vmは、サーボモータ36に供給される電圧である。制御電源電圧Vdcは、直流電源回路60の出力電圧である。
FIG. 4 is a graph showing the evaluation results of the electric circuit of the comparative example not provided with the bypass circuit 80. Further, FIG. 5 is a graph showing the evaluation results of the electric circuit 40 of the embodiment including the bypass circuit 80. 4 and 5 show the voltages measured at the four measurement points in the electric circuit 40. That is, the measured voltages are the AC input voltage Vac, the servo power supply voltage Vpn, the motor voltage Vm, and the control power supply voltage Vdc. The AC input voltage Vac is a voltage input from the commercial AC power supply 17. The servo power supply voltage Vpn is a voltage between the P line Lp and the N line Ln. The motor voltage Vm is a voltage supplied to the servomotor 36. The control power supply voltage Vdc is the output voltage of the DC power supply circuit 60.
図4は、比較例において瞬時停電時の停電時間Tpcが114ミリ秒であるときの各電圧Vac,Vpn,Vm,Vdcの測定結果を示す。瞬時停電中は、商用交流電源17からの電力供給が停止するため、交流入力電圧Vacは0ボルトになる。
FIG. 4 shows the measurement results of the respective voltages Vac, Vpn, Vm, and Vdc when the power failure time Tpc at the time of a momentary power failure is 114 milliseconds in the comparative example. During a momentary power failure, the power supply from the commercial AC power supply 17 is stopped, so the AC input voltage Vac becomes 0 volt.
サーボ電源電圧Vpnは、瞬時停電開始から徐々に低下する。これは平滑コンデンサ55に蓄電されていた電荷が徐々に低減することによる。サーボ電源電圧Vpnは、瞬時停電から復電した後に必要な高電位に復帰した。しかし、モータ電圧Vmは、瞬時停電開始から減少するとともに不安定になり、瞬時停電から復電した後も、必要なモータ電圧を供給することができなかった。
The servo power supply voltage VPN gradually decreases from the start of the instantaneous power failure. This is because the electric charge stored in the smoothing capacitor 55 is gradually reduced. The servo power supply voltage Vpn returned to the required high potential after recovering from the instantaneous power failure. However, the motor voltage Vm decreased and became unstable from the start of the instantaneous power failure, and the required motor voltage could not be supplied even after the power was restored from the instantaneous power failure.
制御電源電圧Vdcは、瞬時停電開始から所定時間の間は、平滑用のコンデンサ62に蓄電されていた電荷により必要な制御電源電圧V0に保たれるが、その後、降下して0ボルトに至る。この制御電源電圧Vdcの降下は、メインコントローラ41の駆動電圧の降下に繋がる。このため、メインコントローラ41は、供給される駆動電圧の低下を検出すると、実行中の制御を強制的に停止する。その結果、サーボモータ36及び電動式のアクチュエータ43が強制的に停止される。すなわち、射出成形機10が非常停止する。
The control power supply voltage Vdc is maintained at the required control power supply voltage V0 by the electric charge stored in the smoothing capacitor 62 for a predetermined time from the start of the instantaneous power failure, but then drops to 0 volt. This drop in the control power supply voltage Vdc leads to a drop in the drive voltage of the main controller 41. Therefore, when the main controller 41 detects a drop in the supplied drive voltage, the main controller 41 forcibly stops the control during execution. As a result, the servomotor 36 and the electric actuator 43 are forcibly stopped. That is, the injection molding machine 10 is in an emergency stop.
一方、図5は、実施例において瞬時停電時の停電時間Tpcが160ミリ秒であるときの各電圧Vac,Vpn,Vm,Vdcの測定結果を示す。瞬時停電中は、商用交流電源17からの電力供給が停止するため、交流入力電圧Vacは0ボルトになる。瞬時停電から復電すると、交流入力電圧Vacは所定電圧(例えば440V)に戻る。
On the other hand, FIG. 5 shows the measurement results of the respective voltages Vac, Vpn, Vm, and Vdc when the power failure time Tpc at the time of a momentary power failure is 160 milliseconds in the embodiment. During a momentary power failure, the power supply from the commercial AC power supply 17 is stopped, so the AC input voltage Vac becomes 0 volt. When the power is restored from the momentary power failure, the AC input voltage Vac returns to a predetermined voltage (for example, 440V).
サーボ電源電圧Vpnは、瞬時停電開始から徐々に低下する。これは平滑コンデンサ55に蓄電されていた電荷が高電位の保持に使用されるが、蓄電された電荷が徐々に低減することによる。サーボ電源電圧Vpnは、瞬時停電から復電した後に必要な高電位に復帰した。
The servo power supply voltage VPN gradually decreases from the start of the instantaneous power failure. This is because the electric charge stored in the smoothing capacitor 55 is used to maintain the high potential, but the stored electric charge gradually decreases. The servo power supply voltage Vpn returned to the required high potential after recovering from the instantaneous power failure.
モータ電圧Vmは、瞬時停電開始から減少するとともに不安定になるものの、瞬時停電から復電した後は、必要なモータ電圧を供給できた。
Although the motor voltage Vm decreased and became unstable from the start of the momentary power failure, the required motor voltage could be supplied after the power was restored from the momentary power failure.
制御電源電圧Vdcは、瞬時停電開始から所定時間の間は、平滑用のコンデンサ62に蓄電されていた電荷、及び平滑コンデンサ55に蓄電された電荷によりバイパス回路80を介して直流電源回路60へ流れる電流により、必要な高電位に保持される。その結果、バイパス回路80を介して直流電源回路60へ流れた電流の分だけ、制御電源電圧Vdcが目標の制御電源電圧V0に保たれる時間が延長される。その後、瞬時停電から復電した後も、制御電源電圧Vdcは、必要な制御電源電圧V0に保持される。このため、メインコントローラ41は、実行中の制御を継続することができ、サーボモータ36及び電動式のアクチュエータ43の駆動が継続される。つまり、射出成形機10は停止することなく運転を継続する。
The control power supply voltage Vdc flows to the DC power supply circuit 60 via the bypass circuit 80 by the electric charge stored in the smoothing capacitor 62 and the electric charge stored in the smoothing capacitor 55 during a predetermined time from the start of the instantaneous power failure. The current keeps it at the required high potential. As a result, the time for which the control power supply voltage Vdc is maintained at the target control power supply voltage V0 is extended by the amount of the current flowing through the bypass circuit 80 to the DC power supply circuit 60. After that, the control power supply voltage Vdc is maintained at the required control power supply voltage V0 even after the power is restored from the instantaneous power failure. Therefore, the main controller 41 can continue the control during execution, and the servomotor 36 and the electric actuator 43 are continuously driven. That is, the injection molding machine 10 continues to operate without stopping.
評価試験の結果、瞬時停電から復電したときに、モータ電圧Vmと制御電源電圧Vdcとのうち一方でも復帰できなければ、射出成形機10は運転を継続できない。図5に示す実施例では、瞬時停電から復電したときに、モータ電圧Vmと制御電源電圧Vdcが共に復帰できたので、射出成形機10は運転を継続できる。
As a result of the evaluation test, when the power is restored from the instantaneous power failure, the injection molding machine 10 cannot continue the operation unless either the motor voltage Vm or the control power supply voltage Vdc can be restored. In the embodiment shown in FIG. 5, when the power is restored from the instantaneous power failure, both the motor voltage Vm and the control power supply voltage Vdc can be restored, so that the injection molding machine 10 can continue the operation.
比較例の評価試験では、停電時間Tpcが、114ミリ秒、124ミリ秒、148ミリ秒のときに射出成形機10は停止した。これに対して実施例の評価試験では、停電時間Tpcが、128ミリ秒、132ミリ秒、136ミリ秒、146ミリ秒、160ミリ秒のときのいずれも、射出成形機10は瞬時停電後も運転を継続した。実施例の評価試験では、最長で停電時間Tpcが175ミリ秒まで、射出成形機10の運転が継続されることを確認できた。よって、実施例の射出成形機10によれば、150ミリ秒程度までの瞬時停電に有効である。これは、瞬時停電時の停電時間Tpcが100ミリ秒未満である国や地域において、射出成形機10の瞬時停電時の強制停止の防止に有効であることを意味する。
In the evaluation test of the comparative example, the injection molding machine 10 stopped when the power failure time Tpc was 114 ms, 124 ms, and 148 ms. On the other hand, in the evaluation test of the example, when the power failure time Tpc was 128 ms, 132 ms, 136 ms, 146 ms, or 160 ms, the injection molding machine 10 was used even after a momentary power failure. Continued operation. In the evaluation test of the example, it was confirmed that the operation of the injection molding machine 10 was continued until the power failure time Tpc was 175 milliseconds at the longest. Therefore, according to the injection molding machine 10 of the embodiment, it is effective for an instantaneous power failure of up to about 150 milliseconds. This means that it is effective in preventing the forced stop of the injection molding machine 10 at the time of a momentary power failure in a country or region where the power failure time Tpc at the time of a momentary power failure is less than 100 milliseconds.
以上詳述したように、この実施形態によれば、以下の効果が得られる。
As described in detail above, the following effects can be obtained according to this embodiment.
(1)射出成形機10の電気回路40は、商用交流電源17から入力した所定電圧の交流をサーボモータ36の制御に用いられる電圧及び周波数に変換する変換回路52を有するサーボドライバ50と、商用交流電源17から入力した所定電圧の交流を所定電圧よりも低い供給電圧の直流に変換して出力する直流電源回路60とを備える。変換回路52は、コンバータ部53と平滑コンデンサ55とスイッチング回路の一例としてのインバータ部56とを備える。サーボドライバ50と直流電源回路60は、平滑コンデンサ55から直流電源回路60へ向かう電流を許容する逆流防止回路81を含むバイパス回路80を介して接続されている。よって、商用交流電源17の瞬時停電時には、平滑コンデンサ55に蓄電された電荷による電流がサーボドライバ50から逆流防止回路81を介して直流電源回路60に供給される。このため、直流電源回路60は、瞬時停電の間、所定電圧の直流を供給できる。この結果、商用交流電源17の瞬時停電の復電後もサーボモータ36の駆動が継続される。よって、無停電電源装置等の複雑かつ高価な装置を設けることなく、簡単な回路構成でかつ特別な制御を行うことなく、瞬時停電時の復電後にサーボモータ36の駆動が継続され、射出成形機10の運転を継続できる頻度を高めることができる。
(1) The electric circuit 40 of the injection molding machine 10 includes a servo driver 50 having a conversion circuit 52 that converts an AC of a predetermined voltage input from a commercial AC power supply 17 into a voltage and frequency used for controlling the servo motor 36, and a commercial AC. It is provided with a DC power supply circuit 60 that converts an AC of a predetermined voltage input from the AC power supply 17 into a DC having a supply voltage lower than the predetermined voltage and outputs the AC. The conversion circuit 52 includes a converter unit 53, a smoothing capacitor 55, and an inverter unit 56 as an example of a switching circuit. The servo driver 50 and the DC power supply circuit 60 are connected via a bypass circuit 80 including a backflow prevention circuit 81 that allows a current from the smoothing capacitor 55 to the DC power supply circuit 60. Therefore, at the time of a momentary power failure of the commercial AC power supply 17, the current due to the electric charge stored in the smoothing capacitor 55 is supplied from the servo driver 50 to the DC power supply circuit 60 via the backflow prevention circuit 81. Therefore, the DC power supply circuit 60 can supply a predetermined voltage of DC during a momentary power failure. As a result, the servomotor 36 continues to be driven even after the power is restored from the momentary power failure of the commercial AC power supply 17. Therefore, without installing a complicated and expensive device such as an uninterruptible power supply, the servomotor 36 is continuously driven after the power is restored at the time of a momentary power failure with a simple circuit configuration and without performing special control, and injection molding is performed. The frequency with which the operation of the machine 10 can be continued can be increased.
(2)電気回路40は、直流電源回路60と共通の商用交流電源17から供給される交流によりヒータ27を発熱させるヒータ回路70を更に備える。直流電源回路60は、商用交流電源17からの交流を整流に変換する第1整流回路61と、PWM制御により整流を交流に変換するスイッチング回路63と、交流の周波数を変換する絶縁トランス64と、変換された周波数の交流を整流に変換する第2整流回路65と、整流を供給電圧の直流に平滑化する平滑回路66とを備える。よって、瞬時停電時に平滑コンデンサ55から直流電源回路60に供給される電流が、整流回路61を構成するダイオードD4の逆流防止機能により、直流電源回路60を介してヒータ回路70に流れることを阻止できる。このため、瞬時停電時に平滑コンデンサ55から直流電源回路60に供給される電流が、高電位側電源ラインLaを必要な高電位に保持できる時間の延長に効果的に利用できる。よって、瞬時停電の復電後もサーボモータ36の駆動を継続できるので、射出成形機10の運転を継続できる頻度を一層高めることができる。
(2) The electric circuit 40 further includes a heater circuit 70 that heats the heater 27 by alternating current supplied from a commercial alternating current power source 17 common to the direct current power supply circuit 60. The DC power supply circuit 60 includes a first rectifier circuit 61 that converts AC from a commercial AC power supply 17 into rectifier, a switching circuit 63 that converts rectifier into AC by PWM control, and an isolated transformer 64 that converts AC frequency. It includes a second rectifying circuit 65 that converts alternating current of the converted frequency into rectification, and a smoothing circuit 66 that smoothes rectifying to direct current of the supply voltage. Therefore, the current supplied from the smoothing capacitor 55 to the DC power supply circuit 60 at the time of a momentary power failure can be prevented from flowing to the heater circuit 70 via the DC power supply circuit 60 by the backflow prevention function of the diode D4 constituting the rectifier circuit 61. .. Therefore, the current supplied from the smoothing capacitor 55 to the DC power supply circuit 60 at the time of a momentary power failure can be effectively used to extend the time during which the high potential side power supply line La can be held at the required high potential. Therefore, since the servomotor 36 can be continuously driven even after the power is restored from the instantaneous power failure, the frequency with which the injection molding machine 10 can be continuously operated can be further increased.
(第2実施形態)
次に、第2実施形態について図6を参照して説明する。第2実施形態では、平滑コンデンサ55と並列に外付けされた第2の平滑コンデンサを設けた点が、前記第1実施形態と異なる。前記第1実施形態と同様の構成については説明を省略し、特に異なる構成についてのみ説明する。なお、図6は、図3と共通の回路部については同じ符号を付し、回路を1つのブロックで示している。 (Second Embodiment)
Next, the second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in that a second smoothing capacitor externally attached in parallel with the smoothingcapacitor 55 is provided. The description of the same configuration as that of the first embodiment will be omitted, and only the different configurations will be described. In FIG. 6, the same reference numerals are given to the circuit portions common to those in FIG. 3, and the circuits are shown by one block.
次に、第2実施形態について図6を参照して説明する。第2実施形態では、平滑コンデンサ55と並列に外付けされた第2の平滑コンデンサを設けた点が、前記第1実施形態と異なる。前記第1実施形態と同様の構成については説明を省略し、特に異なる構成についてのみ説明する。なお、図6は、図3と共通の回路部については同じ符号を付し、回路を1つのブロックで示している。 (Second Embodiment)
Next, the second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in that a second smoothing capacitor externally attached in parallel with the smoothing
図6に示すように、サーボドライバ50は、平滑コンデンサ55と並列に接続可能な端子を有する外付けユニット58を備える。外付けユニット58には、外付けである第2の平滑コンデンサ59が、サーボドライバ50内の平滑コンデンサ55と並列に接続されている。すなわち、PラインLpとNラインLnとの間に、2つの平滑コンデンサ55,59は並列に接続されている。これにより、瞬時停電時には、2つの平滑コンデンサ55,59に蓄電された2つ分の電荷による電流がバイパス回路80を介して直流電源回路60に供給される。このため、瞬時停電時に、第1実施形態の電気回路40よりも、サーボドライバ50におけるPラインLpの電位を高電位に保持できる時間、及び直流電源回路60における高電位側電源ラインLaの電位を高電位に保持できる時間を、さらに延長できる。そのため、瞬時停電から復電した後、モータ電圧Vm及び制御電源電圧Vdcを目標電圧に復帰できる。その結果、瞬時停電時に、射出成形機10の運転を継続できる。
As shown in FIG. 6, the servo driver 50 includes an external unit 58 having a terminal that can be connected in parallel with the smoothing capacitor 55. An external second smoothing capacitor 59 is connected to the external unit 58 in parallel with the smoothing capacitor 55 in the servo driver 50. That is, two smoothing capacitors 55 and 59 are connected in parallel between the P line Lp and the N line Ln. As a result, in the event of a momentary power failure, the current due to the two charges stored in the two smoothing capacitors 55 and 59 is supplied to the DC power supply circuit 60 via the bypass circuit 80. Therefore, at the time of a momentary power failure, the time during which the potential of the P line Lp in the servo driver 50 can be held at a higher potential than that of the electric circuit 40 of the first embodiment and the potential of the high potential side power supply line La in the DC power supply circuit 60 are set. The time that can be held at a high potential can be further extended. Therefore, the motor voltage Vm and the control power supply voltage Vdc can be returned to the target voltage after the power is restored from the instantaneous power failure. As a result, the operation of the injection molding machine 10 can be continued even in the event of a momentary power failure.
第2実施形態によれば、前記第1実施形態と同様の効果に加え、以下の効果を得ることができる。
According to the second embodiment, the following effects can be obtained in addition to the same effects as those of the first embodiment.
(3)サーボドライバ50には、平滑コンデンサ55と並列に第2の平滑コンデンサ59が外付けされている。よって、商用交流電源17の瞬時停電時に、射出成形機10の運転を継続できる頻度を一層高めることができる。
(3) A second smoothing capacitor 59 is externally attached to the servo driver 50 in parallel with the smoothing capacitor 55. Therefore, it is possible to further increase the frequency with which the injection molding machine 10 can be continued to operate in the event of a momentary power failure of the commercial AC power supply 17.
(第3実施形態)
次に、第3実施形態について図7を参照して説明する。前記第1実施形態及び前記第2実施形態の射出成形機10は、サーボモータ36が油圧ポンプ34を駆動する電動油圧式であったが、第3実施形態の射出成形機10は電動式である。電動式の射出成形機10は、前記第1実施形態における、射出シリンダ24、計量モータ25、型締シリンダ28、エジェクタシリンダ32及び移動シリンダ26に替え、それぞれ射出モータ、計量モータ、型締モータ、エジェクタモータ及びノズルタッチ用の移動モータを備える。これら5個のモータのうち少なくともN個(Nは2以上の自然数)のモータが、サーボモータ36よりなる。第3実施形態では、射出成形機10は、例えば4個のサーボモータ36を備える。4個のサーボモータ36は、射出モータ、計量モータ、型締モータ及びエジェクタモータである。 (Third Embodiment)
Next, the third embodiment will be described with reference to FIG. 7. Theinjection molding machine 10 of the first embodiment and the second embodiment is an electro-hydraulic type in which a servomotor 36 drives a hydraulic pump 34, but the injection molding machine 10 of the third embodiment is an electric type. .. The electric injection molding machine 10 replaces the injection cylinder 24, the weighing motor 25, the mold clamping cylinder 28, the ejector cylinder 32, and the moving cylinder 26 in the first embodiment, and replaces the injection motor, the weighing motor, and the mold clamping motor, respectively. It is equipped with an ejector motor and a moving motor for touching the nozzle. Of these five motors, at least N (N is a natural number of 2 or more) comprises the servomotor 36. In the third embodiment, the injection molding machine 10 includes, for example, four servomotors 36. The four servo motors 36 are an injection motor, a weighing motor, a mold clamping motor, and an ejector motor.
次に、第3実施形態について図7を参照して説明する。前記第1実施形態及び前記第2実施形態の射出成形機10は、サーボモータ36が油圧ポンプ34を駆動する電動油圧式であったが、第3実施形態の射出成形機10は電動式である。電動式の射出成形機10は、前記第1実施形態における、射出シリンダ24、計量モータ25、型締シリンダ28、エジェクタシリンダ32及び移動シリンダ26に替え、それぞれ射出モータ、計量モータ、型締モータ、エジェクタモータ及びノズルタッチ用の移動モータを備える。これら5個のモータのうち少なくともN個(Nは2以上の自然数)のモータが、サーボモータ36よりなる。第3実施形態では、射出成形機10は、例えば4個のサーボモータ36を備える。4個のサーボモータ36は、射出モータ、計量モータ、型締モータ及びエジェクタモータである。 (Third Embodiment)
Next, the third embodiment will be described with reference to FIG. 7. The
図7に示すように、射出成形機10の電気回路40は、複数のサーボモータ36を制御するサーボドライバ50を備える。サーボドライバ50が有する変換回路52は、N個のサーボモータ36を個別に制御する、第1変換回路521、第2変換回路522、…、第N変換回路52Nを備える。変換回路52における共通のPラインLpとNラインLnとの間に、N個の変換回路521~52Nがそれぞれ並列に接続されている。N個の変換回路521~52Nは、サーボモータ36ごとに、少なくとも平滑コンデンサ55及びインバータ部56を備える。詳しくは、第1変換回路521は、コンバータ部53、回生回路54、平滑コンデンサ55及びインバータ部56を備える。残りの第2変換回路522、…、第N変換回路52Nは、それぞれ平滑コンデンサ55及びインバータ部56を備える。変換回路52において、単一のコンバータ部53及び単一の回生回路54は、複数の変換回路521~52N間で共通で用いられる。他の例では、変換回路52は、サーボモータ36ごとに、コンバータ部53、平滑コンデンサ55及びインバータ部56を備えてもよい。
As shown in FIG. 7, the electric circuit 40 of the injection molding machine 10 includes a servo driver 50 that controls a plurality of servo motors 36. The conversion circuit 52 included in the servo driver 50 includes a first conversion circuit 521, a second conversion circuit 522, ..., And an Nth conversion circuit 52N that individually controls N servomotors 36. N conversion circuits 521 to 52N are connected in parallel between the common P line Lp and the N line Ln in the conversion circuit 52, respectively. The N conversion circuits 521 to 52N include at least a smoothing capacitor 55 and an inverter section 56 for each servomotor 36. Specifically, the first conversion circuit 521 includes a converter unit 53, a regenerative circuit 54, a smoothing capacitor 55, and an inverter unit 56. The remaining second conversion circuit 522, ..., And the Nth conversion circuit 52N include a smoothing capacitor 55 and an inverter unit 56, respectively. In the conversion circuit 52, the single converter unit 53 and the single regenerative circuit 54 are commonly used among the plurality of conversion circuits 521 to 52N. In another example, the conversion circuit 52 may include a converter unit 53, a smoothing capacitor 55, and an inverter unit 56 for each servomotor 36.
PラインLpとNラインLnが、バイパス回路80を介して直流電源回路60における高電位側電源ラインLaと低電位側電源ラインLbに接続されている。すなわち、PラインLpが逆流防止回路81の第1ダイオード82を介して高電位側電源ラインLaに接続され、NラインLnが低電位側電源ラインLbに接続されている。
The P line Lp and the N line Ln are connected to the high potential side power supply line La and the low potential side power supply line Lb in the DC power supply circuit 60 via the bypass circuit 80. That is, the P line Lp is connected to the high potential side power supply line La via the first diode 82 of the backflow prevention circuit 81, and the N line Ln is connected to the low potential side power supply line Lb.
第3の実施形態の電気回路40は、M個(但しMは自然数)の直流電源回路60を備える。図7に示す例では、M=1であるが、電気回路40は、2個以上のM個(但しMは2以上の自然数)の直流電源回路60を備えてもよい。直流電源回路60の構成は、前記第1実施形態と同様である。すなわち、直流電源回路60は、第1整流回路の一例としての整流回路61、平滑用のコンデンサ62、スイッチング回路63、絶縁トランス64、第2の整流回路の一例としての整流回路65及び平滑回路66を備える。
The electric circuit 40 of the third embodiment includes M (where M is a natural number) DC power supply circuits 60. In the example shown in FIG. 7, M = 1, but the electric circuit 40 may include two or more M DC power supply circuits 60 (where M is two or more natural numbers). The configuration of the DC power supply circuit 60 is the same as that of the first embodiment. That is, the DC power supply circuit 60 includes a rectifier circuit 61 as an example of the first rectifier circuit, a smoothing capacitor 62, a switching circuit 63, an isolation transformer 64, and a rectifier circuit 65 and a smoothing circuit 66 as an example of the second rectifier circuit. To be equipped.
そして、電気回路40は、サーボモータ36の個数Nと、直流電源回路60の個数Mとの間に、N>Mの大小関係が成立する。ここで、サーボモータ36の個数Nは、サーボモータ36ごとに設けられる変換回路521~52Nの個数に等しく、これは変換回路521~52Nを構成する平滑コンデンサ55の個数に等しい。つまり、N個の平滑コンデンサ55がバイパス回路80を介してM個の直流電源回路60に接続されている。具体的には、変換回路52のPラインLpは、M個の直流電源回路60のM本の高電位側電源ラインLaと第1ダイオード82を介して第1バイパスラインL1により接続され、変換回路52のNラインLnは、M個の直流電源回路60のM本の低電位側電源ラインLbと第2バイパスラインL2により接続される。そして、平滑コンデンサ55の個数Nが直流電源回路60の個数Mよりも多く、N>Mの関係が成立する。図7に示すM=1の例では、平滑コンデンサ55の個数Nが例えば4個(N=4)とすると、直流電源回路60の1個当たりの平滑コンデンサ55の割り当て数が4個となる。
Then, in the electric circuit 40, the magnitude relationship of N> M is established between the number N of the servomotors 36 and the number M of the DC power supply circuits 60. Here, the number N of the servomotors 36 is equal to the number of conversion circuits 521 to 52N provided for each servomotor 36, which is equal to the number of smoothing capacitors 55 constituting the conversion circuits 521 to 52N. That is, N smoothing capacitors 55 are connected to M DC power supply circuits 60 via the bypass circuit 80. Specifically, the P line Lp of the conversion circuit 52 is connected to the M high potential side power supply lines La of the M DC power supply circuits 60 by the first bypass line L1 via the first diode 82, and is a conversion circuit. The N line Ln of 52 is connected to M low potential side power supply lines Lb of M DC power supply circuits 60 by a second bypass line L2. Then, the number N of the smoothing capacitors 55 is larger than the number M of the DC power supply circuits 60, and the relationship N> M is established. In the example of M = 1 shown in FIG. 7, if the number N of the smoothing capacitors 55 is, for example, four (N = 4), the number of assigned smoothing capacitors 55 per DC power supply circuit 60 is four.
前記第1実施形態では、サーボモータ36の個数Nと直流電源回路60の個数MとがN=Mの関係にあり、直流電源回路60の1個当たりの平滑コンデンサ55の割り当て個数が1個である。これに対して、第3実施形態では、直流電源回路60を複数(M≧2)設けた場合、平滑コンデンサ55と直流電源回路60との個数が、N>Mを満たすので、直流電源回路60の1個当たりの平滑コンデンサ55の割り当て数が「1」を超える。よって、N>Mを満たす第3実施形態の電気回路40は、前記第1実施形態の電気回路40に比べ、瞬時停電時にPラインLp及び高電位側電源ラインLaの電位を高電位に保持できる時間を更に延長することができる。その結果、瞬時停電時に射出成形機10の運転を継続できる頻度が一層高くなる。
In the first embodiment, the number N of the servomotors 36 and the number M of the DC power supply circuits 60 are in a relationship of N = M, and the number of smoothing capacitors 55 assigned to each of the DC power supply circuits 60 is one. be. On the other hand, in the third embodiment, when a plurality of DC power supply circuits 60 (M ≧ 2) are provided, the number of smoothing capacitors 55 and the DC power supply circuits 60 satisfies N> M, so that the DC power supply circuits 60 The number of smoothing capacitors 55 allocated to each of the above exceeds "1". Therefore, the electric circuit 40 of the third embodiment satisfying N> M can maintain the potentials of the P line Lp and the high potential side power supply line La at a higher potential at the time of a momentary power failure than the electric circuit 40 of the first embodiment. The time can be further extended. As a result, the frequency with which the injection molding machine 10 can be continued in the event of a momentary power failure becomes higher.
第3実施形態によれば、前記第1実施形態と同様の効果に加え、以下の効果を得ることができる。
According to the third embodiment, the following effects can be obtained in addition to the same effects as those of the first embodiment.
(4)サーボドライバ50は、複数のサーボモータ36を制御する。変換回路52は、少なくとも平滑コンデンサ55及びスイッチング回路の一例としてのインバータ部56を、複数のサーボモータ36ごとに備える。複数の平滑コンデンサ55がバイパス回路80を介して直流電源回路60に接続されている。よって、商用交流電源17の瞬時停電時に、複数の平滑コンデンサ55に蓄電された電荷による電流が直流電源回路60に供給されるので、瞬時停電時に射出成形機10を継続して運転できる頻度が一層高くなる。
(4) The servo driver 50 controls a plurality of servo motors 36. The conversion circuit 52 includes at least a smoothing capacitor 55 and an inverter unit 56 as an example of the switching circuit for each of the plurality of servomotors 36. A plurality of smoothing capacitors 55 are connected to the DC power supply circuit 60 via the bypass circuit 80. Therefore, in the event of a momentary power failure of the commercial AC power supply 17, the current due to the electric charges stored in the plurality of smoothing capacitors 55 is supplied to the DC power supply circuit 60, so that the injection molding machine 10 can be continuously operated in the event of a momentary power failure. It gets higher.
(5)射出成形機10はN個(但しNは2以上の自然数)のサーボモータ36を備える。電気回路40は、N個の変換回路521~52Nと、M個(但しMは2以上の自然数)の直流電源回路60とを備える。N個の平滑コンデンサ55がバイパス回路80を介してM個の直流電源回路60に接続されている。N個はM個よりも多い(N>M)。このため、商用交流電源17の瞬時停電時に、N個の平滑コンデンサ55に蓄電された電荷による電流が、N個よりも少ないM個の直流電源回路60に供給される。よって、瞬時停電時に射出成形機10を継続して運転できる頻度が一層高まる。
(5) The injection molding machine 10 includes N servomotors 36 (where N is a natural number of 2 or more). The electric circuit 40 includes N conversion circuits 521 to 52N and M (where M is a natural number of 2 or more) DC power supply circuits 60. N smoothing capacitors 55 are connected to M DC power supply circuits 60 via a bypass circuit 80. N is more than M (N> M). Therefore, at the time of a momentary power failure of the commercial AC power supply 17, the current due to the electric charge stored in the N smoothing capacitors 55 is supplied to the M DC power supply circuits 60, which are less than N. Therefore, the frequency with which the injection molding machine 10 can be continuously operated in the event of a momentary power failure is further increased.
実施形態は、上記に限定されず、以下の態様に変更してもよい。
The embodiment is not limited to the above, and may be changed to the following aspects.
・変換回路52は、整流器(コンバータ部53)と平滑コンデンサ55とスイッチング回路(インバータ部56)とを備えれば足り、例えば回生回路54を備えなくてもよい。
-The conversion circuit 52 may be provided with a rectifier (converter unit 53), a smoothing capacitor 55, and a switching circuit (inverter unit 56), and may not be provided with, for example, a regenerative circuit 54.
・前記第2実施形態において、外付けされた第2の平滑コンデンサ59は、複数個でもよい。
-In the second embodiment, the number of externally attached second smoothing capacitors 59 may be plural.
・第3実施形態における電動式の射出成形機10において、第2実施形態と同様にサーボドライバ50に対して外付けで第2の平滑コンデンサ59を、平滑コンデンサ55と並列に接続してもよい。
In the electric injection molding machine 10 of the third embodiment, the second smoothing capacitor 59 may be externally connected to the servo driver 50 in parallel with the smoothing capacitor 55 as in the second embodiment. ..
・前記第3実施形態において、モータごとに設けられた複数の変換回路のそれぞれが有する複数(N個)の平滑コンデンサ55のうち一部の平滑コンデンサの容量を、他の平滑コンデンサの容量よりも大きくすることで、瞬時停電時における制御電源電圧V0の保持時間を延ばしてもよい。
In the third embodiment, the capacity of some of the smoothing capacitors 55 among the plurality of (N) smoothing capacitors each of the plurality of conversion circuits provided for each motor is set to be larger than the capacity of the other smoothing capacitors. By increasing the value, the holding time of the control power supply voltage V0 at the time of a momentary power failure may be extended.
・前記第3実施形態において、直流電源回路60を複数設けた場合、変換回路52を構成する平滑コンデンサ55の個数Nと直流電源回路60の個数Mとの組合せは、N>Mが成立する範囲で適宜変更してもよい。例えば、N個とM個の組合せが、3個と2個の組合せ、4個と2個の組合せ、4個と3個の組合せ、5個と2個の組合せなどでもよい。
When a plurality of DC power supply circuits 60 are provided in the third embodiment, the combination of the number N of the smoothing capacitors 55 constituting the conversion circuit 52 and the number M of the DC power supply circuits 60 is within the range in which N> M is established. May be changed as appropriate. For example, the combination of N pieces and M pieces may be a combination of 3 pieces and 2 pieces, a combination of 4 pieces and 2 pieces, a combination of 4 pieces and 3 pieces, a combination of 5 pieces and 2 pieces, and the like.
・前記第3実施形態において、射出モータ、計量モータ、型締モータ、エジェクタモータ及び移動モータは、第1の組と第2の組とに分類されてもよい。第1の組のモータに対応する第1の組の変換回路52と、第2の組のモータに対応する第2の組の変換回路52とが、それぞれ個別にPライン及びNラインを有する。この場合、直流電源回路60を2個設け、第1の組の変換回路52と一方の直流電源回路60とを第1のバイパス回路80を介して接続し、第2の組の変換回路52と他方の直流電源回路60とを第2のバイパス回路80を介して接続してもよい。
-In the third embodiment, the injection motor, the weighing motor, the mold clamping motor, the ejector motor, and the mobile motor may be classified into a first set and a second set. The first set of conversion circuits 52 corresponding to the first set of motors and the second set of conversion circuits 52 corresponding to the second set of motors have P lines and N lines, respectively. In this case, two DC power supply circuits 60 are provided, and the first set of conversion circuits 52 and one DC power supply circuit 60 are connected via the first bypass circuit 80 to connect with the second set of conversion circuits 52. The other DC power supply circuit 60 may be connected via the second bypass circuit 80.
・前記第3実施形態では、N>Mとしたが、M>Nであってもよい。
-In the third embodiment, N> M is set, but M> N may be used.
・サーボモータ36は、どの種類のモータを用いてもよく、例えばACモータやDCモータであってもよい。要するに、モータを駆動するモータドライバが、整流器、平滑コンデンサ及びスイッチング回路を有すれば足りる。
-The servo motor 36 may use any type of motor, for example, an AC motor or a DC motor. In short, it suffices if the motor driver that drives the motor has a rectifier, a smoothing capacitor, and a switching circuit.
本開示は、以下の実装例を包含する。限定のためでなく、理解の補助として例示的な実施形態のいくつかの構成要素の参照符号を付した。以下の実装例において記述した事項のうちの一部を省略してもよく、実装例において記述した事項のうちのいくつかを選択または抽出して組合せてもよい。
This disclosure includes the following implementation examples. Reference symbols have been added to some of the components of the exemplary embodiments, not for limitation, but as an aid to understanding. Some of the items described in the following implementation examples may be omitted, or some of the items described in the implementation examples may be selected or extracted and combined.
[付記1]本開示の一または複数の実装例に従う射出成形機(10)の電気回路(40)は、
モータ(36)を駆動するモータドライバ(50)であって、第1の制御信号を生成するように構成されたモータコントローラ(例えば、サーボコントローラ)(51)と、前記第1の制御信号に基づいて、商用交流電源(17)から供給された商用交流電圧(Vac)を前記モータ(36)の制御に用いられる第1の交流電圧(Vm)に変換する変換回路(52)と、を含む前記モータドライバ(50)と、
前記商用交流電源(17)から供給された商用交流電圧(Vac)を第1の直流電圧に変換し、該第1の直流電圧(Vdc)を電源電圧として前記モータコントローラ(51)に供給する直流電源回路(60)と、を備え、
前記モータドライバ(50)の変換回路(52)は、第1の平滑コンデンサ(55)を含み、前記直流電源回路(60)は、第2の平滑コンデンサ(62)を含み、
前記モータドライバ(50)は、前記第1の平滑コンデンサ(55)から前記直流電源回路(60)へ向かう電流を許容する逆流防止回路(81)を含むバイパス回路(80)を介して前記直流電源回路(60)に接続されていることができる。 [Appendix 1] The electric circuit (40) of the injection molding machine (10) according to one or more mounting examples of the present disclosure is
Based on a motor controller (for example, a servo controller) (51) which is a motor driver (50) for driving a motor (36) and is configured to generate a first control signal, and the first control signal. A conversion circuit (52) that converts a commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first AC voltage (Vm) used for controlling the motor (36). Motor driver (50) and
A direct current that converts the commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first DC voltage and supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51). With a power supply circuit (60)
The conversion circuit (52) of the motor driver (50) includes a first smoothing capacitor (55), and the DC power supply circuit (60) includes a second smoothing capacitor (62).
The motor driver (50) uses the DC power supply via a bypass circuit (80) including a backflow prevention circuit (81) that allows a current from the first smoothing capacitor (55) to the DC power supply circuit (60). It can be connected to the circuit (60).
モータ(36)を駆動するモータドライバ(50)であって、第1の制御信号を生成するように構成されたモータコントローラ(例えば、サーボコントローラ)(51)と、前記第1の制御信号に基づいて、商用交流電源(17)から供給された商用交流電圧(Vac)を前記モータ(36)の制御に用いられる第1の交流電圧(Vm)に変換する変換回路(52)と、を含む前記モータドライバ(50)と、
前記商用交流電源(17)から供給された商用交流電圧(Vac)を第1の直流電圧に変換し、該第1の直流電圧(Vdc)を電源電圧として前記モータコントローラ(51)に供給する直流電源回路(60)と、を備え、
前記モータドライバ(50)の変換回路(52)は、第1の平滑コンデンサ(55)を含み、前記直流電源回路(60)は、第2の平滑コンデンサ(62)を含み、
前記モータドライバ(50)は、前記第1の平滑コンデンサ(55)から前記直流電源回路(60)へ向かう電流を許容する逆流防止回路(81)を含むバイパス回路(80)を介して前記直流電源回路(60)に接続されていることができる。 [Appendix 1] The electric circuit (40) of the injection molding machine (10) according to one or more mounting examples of the present disclosure is
Based on a motor controller (for example, a servo controller) (51) which is a motor driver (50) for driving a motor (36) and is configured to generate a first control signal, and the first control signal. A conversion circuit (52) that converts a commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first AC voltage (Vm) used for controlling the motor (36). Motor driver (50) and
A direct current that converts the commercial AC voltage (Vac) supplied from the commercial AC power supply (17) into a first DC voltage and supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51). With a power supply circuit (60)
The conversion circuit (52) of the motor driver (50) includes a first smoothing capacitor (55), and the DC power supply circuit (60) includes a second smoothing capacitor (62).
The motor driver (50) uses the DC power supply via a bypass circuit (80) including a backflow prevention circuit (81) that allows a current from the first smoothing capacitor (55) to the DC power supply circuit (60). It can be connected to the circuit (60).
[付記2]本開示のいくつかの実装例では、前記モータドライバ(50)の第1の平滑コンデンサ(55)は、前記モータドライバ(50)の高電位側電源ライン(Lp)と低電位側電源ライン(Ln)との間に接続され、
前記直流電源回路(60)の第2の平滑コンデンサ(62)は、前記直流電源回路(60)の第1の高電位側電源ライン(La)と第1の低電位側電源ライン(Lb)との間に接続され、
前記モータドライバ(50)の高電位側電源ライン(Lp)は、前記バイパス回路(80)を介して前記直流電源回路(60)の第1の高電位側電源ライン(La)に接続されていることができる。 [Appendix 2] In some implementation examples of the present disclosure, the first smoothing capacitor (55) of the motor driver (50) is the high potential side power supply line (Lp) and the low potential side of the motor driver (50). Connected to the power line (Ln)
The second smoothing capacitor (62) of the DC power supply circuit (60) includes a first high potential side power supply line (La) and a first low potential side power supply line (Lb) of the DC power supply circuit (60). Connected between
The high potential side power supply line (Lp) of the motor driver (50) is connected to the first high potential side power supply line (La) of the DC power supply circuit (60) via the bypass circuit (80). be able to.
前記直流電源回路(60)の第2の平滑コンデンサ(62)は、前記直流電源回路(60)の第1の高電位側電源ライン(La)と第1の低電位側電源ライン(Lb)との間に接続され、
前記モータドライバ(50)の高電位側電源ライン(Lp)は、前記バイパス回路(80)を介して前記直流電源回路(60)の第1の高電位側電源ライン(La)に接続されていることができる。 [Appendix 2] In some implementation examples of the present disclosure, the first smoothing capacitor (55) of the motor driver (50) is the high potential side power supply line (Lp) and the low potential side of the motor driver (50). Connected to the power line (Ln)
The second smoothing capacitor (62) of the DC power supply circuit (60) includes a first high potential side power supply line (La) and a first low potential side power supply line (Lb) of the DC power supply circuit (60). Connected between
The high potential side power supply line (Lp) of the motor driver (50) is connected to the first high potential side power supply line (La) of the DC power supply circuit (60) via the bypass circuit (80). be able to.
[付記3]本開示のいくつかの実装例では、前記モータドライバ(50)は、前記商用交流電源からの商用交流電圧(Vac)を第1の整流電圧に変換する整流器(53)と、前記第1の整流電圧を平滑化して第2の直流電圧を生成する前記第1の平滑コンデンサ(55)と、前記第1の制御信号に基づいて前記第2の直流電圧を前記第1の交流電圧(Vm)に変換するスイッチング回路(56)と、を含むことができる。
[Appendix 3] In some implementation examples of the present disclosure, the motor driver (50) includes a rectifier (53) that converts a commercial AC voltage (Vac) from the commercial AC power supply into a first rectified voltage, and the above. The first smoothing capacitor (55) that smoothes the first rectified voltage to generate a second DC voltage, and the second DC voltage based on the first control signal is the first AC voltage. A switching circuit (56) that converts to (Vm) can be included.
[付記4]本開示のいくつかの実装例では、前記直流電源回路(60)は、前記商用交流電源からの商用交流電圧(Vac)を第2の整流電圧に変換する第2の整流回路(61)と、前記第2の整流電圧を平滑化して第3の直流電圧を生成する前記第2の平滑コンデンサ(62)と、PWM制御により前記第3の直流電圧を前記商用交流電圧(Vac)よりも低い第2の交流電圧に変換するスイッチング回路(63)と、前記第2の交流電圧の周波数を変更する絶縁トランス(64)と、変更された周波数を有する第2の交流電圧を第3の整流電圧に変換する第3の整流回路(65)と、前記第3の整流電圧を平滑化して前記第1の直流電圧(Vdc)を生成する平滑回路(66)と、を含むことができる。
[Appendix 4] In some implementation examples of the present disclosure, the DC power supply circuit (60) is a second rectifying circuit (60) that converts a commercial AC voltage (Vac) from the commercial AC power supply into a second rectifying voltage. 61), the second smoothing capacitor (62) that smoothes the second rectified voltage to generate a third DC voltage, and the third DC voltage by PWM control to the commercial AC voltage (Vac). A switching circuit (63) that converts to a lower second AC voltage, an isolated transformer (64) that changes the frequency of the second AC voltage, and a third AC voltage that has the changed frequency. A third rectifying circuit (65) that converts to the rectifying voltage of the above, and a smoothing circuit (66) that smoothes the third rectifying voltage to generate the first DC voltage (Vdc) can be included. ..
[付記5]本開示のいくつかの実装例では、前記直流電源回路(60)の前記第2の整流回路(61)、前記スイッチング回路(63)及び前記絶縁トランス(64)の1次コイルは、前記直流電源回路(60)の第1の高電位側電源ライン(La)と第1の低電位側電源ライン(Lb)との間に接続され、前記直流電源回路(60)の前記絶縁トランス(64)の2次コイル、前記第3の整流回路(65)、及び前記平滑回路(66)は、前記直流電源回路(60)の第2の高電位側電源ライン(Lc)と第2の低電位側電源ライン(Ld)との間に接続されていることができる。
[Appendix 5] In some implementation examples of the present disclosure, the primary coils of the second rectifying circuit (61), the switching circuit (63), and the isolated transformer (64) of the DC power supply circuit (60) are , The isolated transformer of the DC power supply circuit (60), which is connected between the first high potential side power supply line (La) and the first low potential side power supply line (Lb) of the DC power supply circuit (60). The secondary coil of (64), the third rectifying circuit (65), and the smoothing circuit (66) are the second high potential side power supply line (Lc) and the second power supply line (Lc) of the DC power supply circuit (60). It can be connected to the low potential side power supply line (Ld).
[付記6]本開示のいくつかの実装例では、前記射出成形機(10)の電気回路(40)は、第2の制御信号を生成して前記モータコントローラ(51)に送信するように構成されたメインコントローラ(41)をさらに備え、
前記モータコントローラ(51)は、前記第2の制御信号に基づいて前記第1の制御信号を生成するようにさらに構成され、
前記直流電源回路(60)は、前記モータコントローラ(51)に第1の電源回路(47)を介して前記第1の直流電圧(Vdc)を電源電圧として供給し、前記メインコントローラ(41)に第2の電源回路(44)を介して前記第1の直流電圧(Vdc)を電源電圧として供給し、
前記第1の電源回路(47)は、前記第1の直流電圧(Vdc)の電圧値を前記モータコントローラ(51)に対応する電圧値に調整し、前記第2の電源回路(44)は、前記第1の直流電圧(Vdc)の電圧値をメインコントローラ(41)に対応する電圧値に調整することができる。 [Appendix 6] In some implementation examples of the present disclosure, the electric circuit (40) of the injection molding machine (10) is configured to generate a second control signal and transmit it to the motor controller (51). Further equipped with the main controller (41)
The motor controller (51) is further configured to generate the first control signal based on the second control signal.
The DC power supply circuit (60) supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51) via the first power supply circuit (47), and supplies the main controller (41) with the first DC voltage (Vdc). The first DC voltage (Vdc) is supplied as a power supply voltage via the second power supply circuit (44).
The first power supply circuit (47) adjusts the voltage value of the first DC voltage (Vdc) to a voltage value corresponding to the motor controller (51), and the second power supply circuit (44) adjusts the voltage value to correspond to the motor controller (51). The voltage value of the first DC voltage (Vdc) can be adjusted to the voltage value corresponding to the main controller (41).
前記モータコントローラ(51)は、前記第2の制御信号に基づいて前記第1の制御信号を生成するようにさらに構成され、
前記直流電源回路(60)は、前記モータコントローラ(51)に第1の電源回路(47)を介して前記第1の直流電圧(Vdc)を電源電圧として供給し、前記メインコントローラ(41)に第2の電源回路(44)を介して前記第1の直流電圧(Vdc)を電源電圧として供給し、
前記第1の電源回路(47)は、前記第1の直流電圧(Vdc)の電圧値を前記モータコントローラ(51)に対応する電圧値に調整し、前記第2の電源回路(44)は、前記第1の直流電圧(Vdc)の電圧値をメインコントローラ(41)に対応する電圧値に調整することができる。 [Appendix 6] In some implementation examples of the present disclosure, the electric circuit (40) of the injection molding machine (10) is configured to generate a second control signal and transmit it to the motor controller (51). Further equipped with the main controller (41)
The motor controller (51) is further configured to generate the first control signal based on the second control signal.
The DC power supply circuit (60) supplies the first DC voltage (Vdc) as a power supply voltage to the motor controller (51) via the first power supply circuit (47), and supplies the main controller (41) with the first DC voltage (Vdc). The first DC voltage (Vdc) is supplied as a power supply voltage via the second power supply circuit (44).
The first power supply circuit (47) adjusts the voltage value of the first DC voltage (Vdc) to a voltage value corresponding to the motor controller (51), and the second power supply circuit (44) adjusts the voltage value to correspond to the motor controller (51). The voltage value of the first DC voltage (Vdc) can be adjusted to the voltage value corresponding to the main controller (41).
[付記7]本開示のいくつかの実装例では、前記商用交流電源(17)から前記モータドライバ(50)に供給される商用交流電圧(Vac)は、3相の交流電圧であり、前記商用交流電源(17)から前記直流電源回路(60)に供給される商用交流電圧(Vac)は、2相の交流電圧であることができる。
[Appendix 7] In some implementation examples of the present disclosure, the commercial AC voltage (Vac) supplied from the commercial AC power supply (17) to the motor driver (50) is a three-phase AC voltage, and is the commercial AC voltage. The commercial AC voltage (Vac) supplied from the AC power supply (17) to the DC power supply circuit (60) can be a two-phase AC voltage.
10…射出成形機、11…射出装置、12…型締装置、15…金型、21…加熱筒、17…商用交流電源、25…計量モータ、27…ヒータ、33…油圧回路、34…油圧ポンプ、35…切換バルブ回路、36…モータの一例としてのサーボモータ、40…電気回路、41…メインコントローラ、50…モータドライバの一例としてのサーボドライバ、52…変換回路、521…第1変換回路、522…第2変換回路、52N…第N変換回路、53…整流器の一例として整流回路、54…回生回路、55…平滑コンデンサ、54…回生回路、56…スイッチング回路の一例としてのインバータ部、57…回生制御回路、59…第2の平滑コンデンサ、60…直流電源回路、61…第1整流回路の一例としての整流回路、62…平滑コンデンサ、63…スイッチング回路、64…絶縁トランス、65…第2整流回路の一例としての整流回路、66…平滑回路、69…電圧制御回路、70…ヒータ回路、80…バイパス回路、81…逆流防止回路、Lp…Pライン(高電位側電源ライン)、Ln…Nライン(低電位側電源ライン)、La…高電位側電源ライン、Lb…低電位側電源ライン、Lc…高電位側電源ライン、Ld…低電位側電源ライン、Vac…交流入力電圧、Vpn…サーボ電源電圧、Vm…モータ電圧、Vdc…制御電源電圧、V0…供給電圧の一例である制御電源電圧。
10 ... injection molding machine, 11 ... injection device, 12 ... mold clamping device, 15 ... mold, 21 ... heating cylinder, 17 ... commercial AC power supply, 25 ... metering motor, 27 ... heater, 33 ... hydraulic circuit, 34 ... hydraulic Pump, 35 ... switching valve circuit, 36 ... servo motor as an example of motor, 40 ... electric circuit, 41 ... main controller, 50 ... servo driver as an example of motor driver, 52 ... conversion circuit, 521 ... first conversion circuit , 522 ... 2nd conversion circuit, 52N ... Nth conversion circuit, 53 ... rectifier circuit as an example of a rectifier, 54 ... regenerative circuit, 55 ... smoothing capacitor, 54 ... regenerative circuit, 56 ... inverter section as an example of a switching circuit, 57 ... Regenerative control circuit, 59 ... Second smoothing capacitor, 60 ... DC power supply circuit, 61 ... Rectification circuit as an example of the first rectifying circuit, 62 ... Smoothing capacitor, 63 ... Switching circuit, 64 ... Insulated transformer, 65 ... A rectifying circuit as an example of the second rectifying circuit, 66 ... smoothing circuit, 69 ... voltage control circuit, 70 ... heater circuit, 80 ... bypass circuit, 81 ... backflow prevention circuit, Lp ... P line (high potential side power supply line), Ln ... N line (low potential side power supply line), La ... high potential side power supply line, Lb ... low potential side power supply line, Lc ... high potential side power supply line, Ld ... low potential side power supply line, Vac ... AC input voltage, Vpn ... Servo power supply voltage, Vm ... Motor voltage, Vdc ... Control power supply voltage, V0 ... Control power supply voltage which is an example of supply voltage.
Claims (5)
- モータを駆動制御するモータドライバを有する射出成形機の電気回路であって、
商用交流電源から入力した所定電圧の交流を前記モータの制御に用いられる電圧及び周波数に変換する変換回路を有するモータドライバと、
商用交流電源から入力した所定電圧の交流を前記所定電圧よりも低い供給電圧の直流に変換して出力する直流電源回路と
を備え、
前記変換回路は、整流器と平滑コンデンサとスイッチング回路とを備え、
前記モータドライバと前記直流電源回路は、前記平滑コンデンサから前記直流電源回路へ向かう電流を許容する逆流防止回路を含むバイパス回路を介して接続されていることを特徴とする射出成形機の電気回路。 An electric circuit of an injection molding machine having a motor driver that drives and controls a motor.
A motor driver having a conversion circuit that converts an AC of a predetermined voltage input from a commercial AC power supply into a voltage and frequency used for controlling the motor, and a motor driver.
It is equipped with a DC power supply circuit that converts AC of a predetermined voltage input from a commercial AC power supply into DC of a supply voltage lower than the predetermined voltage and outputs it.
The conversion circuit includes a rectifier, a smoothing capacitor, and a switching circuit.
An electric circuit of an injection molding machine, wherein the motor driver and the DC power supply circuit are connected via a bypass circuit including a backflow prevention circuit that allows a current flowing from the smoothing capacitor to the DC power supply circuit. - 前記直流電源回路と共通の前記商用交流電源から供給される交流によりヒータを発熱させるヒータ回路を更に備え、
前記直流電源回路は、前記商用交流電源からの交流を整流に変換する第1整流回路と、PWM制御により整流を交流に変換するスイッチング回路と、交流の周波数を変換する絶縁トランスと、変換された周波数の交流を整流に変換する第2整流回路と、整流を供給電圧の直流に平滑化する平滑回路とを備えることを特徴とする請求項1に記載の射出成形機の電気回路。 A heater circuit that heats the heater by alternating current supplied from the commercial alternating current power supply, which is common to the direct current power supply circuit, is further provided.
The DC power supply circuit was converted into a first rectifying circuit that converts AC from the commercial AC power supply into rectification, a switching circuit that converts rectification into AC by PWM control, and an isolated transformer that converts the frequency of AC. The electric circuit of an injection molding machine according to claim 1, further comprising a second rectifying circuit that converts alternating current of frequency into rectification, and a smoothing circuit that smoothes rectifying to DC of a supply voltage. - 前記モータドライバに対して、前記平滑コンデンサと並列に第2の平滑コンデンサが外付けされていることを特徴とする請求項1又は請求項2に記載の射出成形機の電気回路。 The electric circuit of an injection molding machine according to claim 1 or 2, wherein a second smoothing capacitor is externally attached to the motor driver in parallel with the smoothing capacitor.
- 前記モータドライバは、複数のモータを制御し、
前記変換回路は、少なくとも前記平滑コンデンサ及び前記スイッチング回路を、複数の前記モータごとにさらに備え、
複数の前記平滑コンデンサが前記バイパス回路を介して前記直流電源回路に接続されていることを特徴とする請求項1又は請求項2に記載の射出成形機の電気回路。 The motor driver controls a plurality of motors and
The conversion circuit further includes at least the smoothing capacitor and the switching circuit for each of the plurality of motors.
The electric circuit of an injection molding machine according to claim 1 or 2, wherein a plurality of the smoothing capacitors are connected to the DC power supply circuit via the bypass circuit. - 前記直流電源回路は、M個の直流電源回路のうちの1つであり、Mは2以上の自然数であり、
前記変換回路は、N個の変換回路のうちの1つであり、Nは2以上の自然数であり、
前記N個の前記平滑コンデンサが前記バイパス回路を介して前記M個の前記直流電源回路に接続されており、
前記N個は前記M個よりも多いことを特徴とする請求項4に記載の射出成形機の電気回路。 The DC power supply circuit is one of M DC power supply circuits, and M is a natural number of 2 or more.
The conversion circuit is one of N conversion circuits, where N is a natural number of 2 or more.
The N smoothing capacitors are connected to the M DC power supply circuits via the bypass circuit.
The electric circuit of the injection molding machine according to claim 4, wherein the N pieces are more than the M pieces.
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JP2001232672A (en) * | 2000-02-22 | 2001-08-28 | Sumitomo Heavy Ind Ltd | Injection molding machine |
JP2011200518A (en) * | 2010-03-26 | 2011-10-13 | Panasonic Corp | Power switching device and control device for washing machine or the like. |
JP2012135913A (en) * | 2010-12-24 | 2012-07-19 | Sumitomo Heavy Ind Ltd | Injection molding machine |
JP2018195569A (en) * | 2017-05-15 | 2018-12-06 | パナソニックIpマネジメント株式会社 | Lighting device and illumination system |
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JP2001232672A (en) * | 2000-02-22 | 2001-08-28 | Sumitomo Heavy Ind Ltd | Injection molding machine |
JP2011200518A (en) * | 2010-03-26 | 2011-10-13 | Panasonic Corp | Power switching device and control device for washing machine or the like. |
JP2012135913A (en) * | 2010-12-24 | 2012-07-19 | Sumitomo Heavy Ind Ltd | Injection molding machine |
JP2018195569A (en) * | 2017-05-15 | 2018-12-06 | パナソニックIpマネジメント株式会社 | Lighting device and illumination system |
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