WO2021214925A1 - 電動機駆動装置及び空気調和機 - Google Patents

電動機駆動装置及び空気調和機 Download PDF

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Publication number
WO2021214925A1
WO2021214925A1 PCT/JP2020/017432 JP2020017432W WO2021214925A1 WO 2021214925 A1 WO2021214925 A1 WO 2021214925A1 JP 2020017432 W JP2020017432 W JP 2020017432W WO 2021214925 A1 WO2021214925 A1 WO 2021214925A1
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Prior art keywords
connection state
value
connection
switching
state
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PCT/JP2020/017432
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English (en)
French (fr)
Japanese (ja)
Inventor
厚司 土谷
和徳 畠山
慎也 豊留
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022516564A priority Critical patent/JP7270841B2/ja
Priority to PCT/JP2020/017432 priority patent/WO2021214925A1/ja
Priority to CN202080099950.8A priority patent/CN115461980A/zh
Publication of WO2021214925A1 publication Critical patent/WO2021214925A1/ja

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Definitions

  • This disclosure relates to a motor drive device and an air conditioner.
  • Motor drive equipped with a connection switching unit having a mechanical relay that switches the connection state of the stator windings (hereinafter also referred to as "windings") of the motor, and an inverter that supplies AC power to the motor to drive the motor.
  • the device is in practical use.
  • the motor drive device performs a protective operation of stopping the inverter when the current flowing through the winding exceeds the overcurrent threshold value. Further, an electric motor drive device that changes the overcurrent threshold value according to the connection state of the winding has also been proposed (see, for example, Patent Document 1).
  • connection switching unit having the mechanical relay has a characteristic that the state of the mechanical relay is switched after the switching delay time elapses from the time when the command signal for commanding the switching is received.
  • the switching delay time elapses from the time when the connection switching part receives the command signal for switching the connection state of the winding from the star connection (Y connection) to the delta connection ( ⁇ connection). Until this is done, the Y connection state remains, and after the switching delay time elapses, the connection state is switched to the ⁇ connection state.
  • connection state is switched by the connection switching unit during the rotation operation period of the motor and the overcurrent threshold is switched to a value higher than the current value at the same time as the command signal for switching is received, the switching delay time is reached.
  • an excessive current may flow in the winding of the motor, causing irreversible demagnetization in the permanent magnets of the motor.
  • the present disclosure has been made to solve the above problems, and even when the connection state is switched and the overcurrent threshold value is switched during the rotational operation period of the motor, an excessive current is applied to the stator winding. It is an object of the present invention to provide an electric motor drive device that does not generate a current state and an air conditioner equipped with the motor drive device.
  • the motor drive device has a mechanical relay, and by switching the state of the mechanical relay, the connection state of the stator winding of the motor can be changed to either the first connection state or the second connection state.
  • the overcurrent threshold of the value corresponding to the winding current is set to either a first value or a second value higher than the first value, and the value corresponding to the winding current is set.
  • a predetermined overcurrent protection operation is performed, the connection state is switched from the first connection state to the second connection state, and the overcurrent threshold is changed to the first.
  • the switching of the state of the mechanical relay is completed at least from the time when the first signal is output to the connection switching unit, and the connection state becomes the second connection state.
  • the overcurrent threshold is maintained at the first value during the first delay time to the time of switching.
  • FIG. 1 It is the schematic which shows the structure of the air conditioner which concerns on embodiment. It is a figure which shows the structure of the electric motor drive device which concerns on embodiment. It is a figure which shows an example of the current path in the Y connection state of the motor drive device of FIG. It is a figure which shows an example of the current path in the ⁇ connection state of the motor drive device of FIG. It is a figure which shows the structure of the inverter of FIG. It is a circuit diagram which shows the structure of the winding and connection switching part of the electric motor of FIG. It is a circuit diagram which shows the example of the structure of the connection switching part of FIG. (A) and (B) are diagrams showing the windings in the Y connection state and the ⁇ connection state, respectively.
  • FIG. 1 It is a waveform diagram which shows an example of the electric current which flows through the winding of an electric motor through a mechanical relay.
  • A is a timing diagram showing switching from the Y connection state to the ⁇ connection state in the motor drive device according to the embodiment, and (B) is the ⁇ connection state from the Y connection state in the motor drive device of the comparative example. It is a timing diagram which shows the switching to.
  • A) is a timing diagram showing the switching from the ⁇ connection state to the Y connection in the motor drive device according to the embodiment, and (B) is the timing diagram from the ⁇ connection state in the motor drive device of the comparative example to the Y connection state. It is a timing diagram which shows the switching of.
  • FIG. 1 is a schematic view showing the configuration of the air conditioner 2 according to the embodiment.
  • the air conditioner 2 includes a refrigerating cycle device 900, and the refrigerating cycle device 900 can perform a heating operation or a cooling operation by switching the four-way valve 902.
  • the refrigeration cycle device 900 can be applied to various refrigeration cycle application devices such as refrigerators, water heaters, and the like.
  • the refrigerant is pressurized by the compressor 901 and sent out, and the four-way valve 902, the indoor heat exchanger 903, the expansion valve 904, the outdoor heat exchanger 905 and the four-way valve 902. It returns to the compressor 901 through.
  • the refrigerant is pressurized by the compressor 901 and sent out, and the four-way valve 902, the outdoor heat exchanger 905, the expansion valve 904, the indoor heat exchanger 903 and the four-way valve 902. It returns to the compressor 901 through.
  • the heat exchanger 903 acts as a condenser to release heat (that is, heats the room), and the heat exchanger 905 acts as an evaporator to absorb heat.
  • the heat exchanger 903 acts as an evaporator to absorb heat (that is, cool the room), and the heat exchanger 905 acts as a condenser to release heat.
  • the motor drive device 1 controls the motor 40 at a variable speed, and the compressor 901 is driven by the motor 40.
  • FIG. 2 is a diagram showing the configuration of the motor drive device 1 according to the embodiment.
  • the motor drive device 1 is a circuit for driving the motor 40.
  • the motor drive device 1 includes a reactor 11, a rectifier circuit 20, a capacitor 21, an inverter 30, a control device 50, a connection switching unit 60, a current detection unit 70, and a control power supply. It includes a generation circuit 80.
  • An AC voltage is applied to the motor drive device 1 from an external AC power supply 10 via an AC power supply input terminal.
  • the applied voltage is, for example, an effective value of amplitude of 100 V or 200 V, a frequency of 50 Hz or 60 Hz, or the like.
  • the rectifier circuit 20 receives an AC voltage from the AC power supply 10 via the reactor 11 and rectifies the AC voltage to generate a DC voltage.
  • the rectifier circuit 20 is a full-wave rectifier circuit formed by bridging a rectifier element such as a diode.
  • the capacitor 21 smoothes the DC voltage generated by the rectifier circuit 20 and outputs the DC voltage.
  • the connection switching unit 60 is a circuit for switching the connection state of the windings 41, 42, 43 of the motor 40.
  • the connection switching unit 60 has mechanical relays 61, 62, 63.
  • a mechanical relay is an electromagnetic switch that opens and closes its contacts electromagnetically.
  • the connection switching unit 60 has a function of switching the connection state of the windings 41, 42, and 43 of the motor 40 to either a Y connection state as the first connection state or a ⁇ connection state as the second connection state.
  • FIG. 3 is a diagram showing an example of the current path in the Y connection state of the motor drive device 1 by a thick broken line with an arrow.
  • connection switching unit 60 switches the states of the mechanical relays 61, 62, and 63 during the rotation operation period in which the rotor of the motor 40 is rotating (that is, without stopping the rotation operation). , Switching of the connection state of the windings 41, 42, 43 of the motor 40 can be completed.
  • the inverter 30 supplies AC power to the windings 41, 42, 43 of the motor 40 via the mechanical relays 61, 62, 63. Further, a counter electromotive voltage is applied to the inverter 30 from the windings 41, 42, 43 of the motor 40 during the rotation operation period via the mechanical relays 61, 62, 63.
  • the current detection unit 70 detects the value Ic corresponding to the winding current flowing through the windings 41, 42, 43 of the motor 40.
  • the current detection unit 70 detects the bus current, that is, the input current of the inverter 30 as the value Ic corresponding to the winding current.
  • the current detection unit 70 includes a shunt resistor inserted in the DC bus and supplies an analog signal indicating the detection result to the control device 50. This signal (that is, the current detection signal) is converted into a digital signal by an A / D (Analog to Digital) converter (not shown) in the control device 50 and used for internal processing of the control device 50.
  • a / D Analog to Digital
  • the current detection unit 70 detects the input current of the inverter 30, it flows through the output current of the inverter 30, that is, one or a plurality of windings 41, 42, and 43 of the motor 40. It may be a detection unit that detects a current.
  • the control power supply generation circuit 80 receives the voltage between both electrodes of the capacitor 21, that is, the bus voltage, lowers the voltage, generates the control power supply voltage V50 and the switching power supply voltage V60, and supplies the control power supply voltage V50 to the control device 50. At the same time, the switching power supply voltage V60 is supplied to the connection switching unit 60.
  • the control device 50 controls the rotation speed (that is, the rotation speed) of the electric motor 40 by controlling the inverter 30. Further, the control device 50 causes the connection switching unit 60 to switch the connection state.
  • the control device 50 is a mechanical relay 61, 62 within a current control period (Pc shown in FIG. 9 described later) in which the value of the alternating current flowing through the windings 41, 42, 43 of the electric motor 40 is close to zero. , 63 switching operations are executed.
  • Switching the connection state of the windings 41, 42, and 43 is switching the connection state to either the Y connection state or the ⁇ connection state, or switching the number of turns of the winding.
  • the switching of the number of turns of the winding is shown in FIG. 15 described later.
  • the control device 50 is, for example, a microcomputer (microcomputer) or DSP having a memory as a storage device for storing control information as a software program and a CPU (Central Processing Unit) as an information processing device for executing this program. It is composed of (Digital Signal Processor) and the like. Further, the control device 50 may be composed of dedicated hardware (for example, a processing circuit).
  • FIG. 5 is a diagram showing the configuration of the inverter 30 of FIG.
  • the inverter 30 has an inverter main circuit 310 and a drive circuit 350.
  • the input terminal of the inverter main circuit 310 is connected to the electrode of the capacitor 21, and the voltage V20 is applied.
  • the line connecting the output of the rectifier circuit 20, the electrode of the capacitor 21, and the input terminal of the inverter main circuit 310 is a DC bus.
  • the inverter 30 is controlled by PWM (Pulse Width Modulation) signals Sm1 to Sm6 received from the control device 50, and switching elements 311 to 316 of the six arms of the inverter main circuit 310 operate on and off. By this on / off operation, the inverter 30 generates a three-phase alternating current having a variable frequency and a variable voltage, and supplies the three-phase alternating current to the motor 40. Rectifying elements 321 to 326 for reflux are connected in parallel to the switching elements 311 to 316, respectively.
  • PWM Pulse Width Modulation
  • the motor 40 is a three-phase permanent magnet synchronous motor, and the ends of the windings 41, 42, and 43 are pulled out to the outside of the motor 40, and can be switched to either a Y connection state or a ⁇ connection state. It is a thing. This switching is performed by the connection switching unit 60.
  • the Y connection state is the first connection state
  • the ⁇ connection state is the second connection state.
  • the overcurrent threshold Iover is a current level for protecting the electric motor 40 from overcurrent, that is, an upper limit of the drive current for preventing irreversible demagnetization of the rare earth magnet, which is a permanent magnet, due to the drive current.
  • FIG. 6 is a circuit diagram showing the configurations of the windings 41, 42, 43 and the connection switching unit 60 of the electric motor 40.
  • the first ends 41a, 42a, 43a of the three-phase windings 41, 42, 43 of the motor 40 which are composed of the U phase, the V phase, and the W phase, are the external terminals 41c. It is connected to 42c and 43c, respectively.
  • the second ends 41b, 42b, 43b of the U-phase, V-phase, and W-phase windings 41, 42, and 43 of the motor 40 are connected to the external terminals 41d, 42d, and 43d, respectively.
  • the electric motor 40 is connected to the connection switching unit 60.
  • the U-phase, V-phase, and W-phase output lines 331, 332, and 333 of the inverter 30 are connected to the external terminals 41c, 42c, and 43c.
  • FIG. 7 is a circuit diagram showing an example of the configuration of the connection switching unit 60 of FIG.
  • the connection switching unit 60 is in a different state depending on whether a current is flowing through the exciting coils 611, 621, or 631 or when no current is flowing.
  • the exciting coils 611, 621, and 631 are connected via the semiconductor switch 604 so as to receive the switching power supply voltage V60.
  • the opening and closing of the semiconductor switch 604 is controlled by a command signal S1 or S2 which is a control signal output from the control device 50.
  • the command signal S1 is referred to as a first signal
  • the command signal S2 is referred to as a second signal.
  • the common contact 61c of the mechanical relay 61 is connected to the external terminal 41d via the lead wire 61e.
  • the normally closed contact 61b is connected to the neutral point node 64, and the normally open contact 61a is connected to the V-phase output line 332 of the inverter 30.
  • the common contact 62c of the mechanical relay 62 is connected to the external terminal 42d via the lead wire 62e.
  • the normally closed contact 62b is connected to the neutral point node 64, and the normally open contact 62a is connected to the W phase output line 333 of the inverter 30.
  • the common contact 63c of the mechanical relay 63 is connected to the external terminal 43d via the lead wire 63e.
  • the normally closed contact 63b is connected to the neutral point node 64, and the normally open contact 63a is connected to the U-phase output line 331 of the inverter 30.
  • the mechanical relays 61, 62, 63 are switched to the normally closed contact side, that is, the common contact 61c, as shown in FIG.
  • the 62c and 63c are in a state of being connected to the normally closed contacts 61b, 62b and 63b (that is, in a conductive state) and are not connected to the normally open contacts 61a, 62a and 63a (that is, in a non-conducting state). In this state, the motor 40 is in the Y connection state.
  • the mechanical relays 61, 62, 63 are reversed from the state shown in FIG. 7, and are switched to the normally open contact side, that is, the common contact 61c. , 62c, 63c are connected to the normally open contacts 61a, 62a, 63a, and are not connected to the normally closed contacts 61b, 62b, 63b (that is, a non-conducting state). In this state, the motor 40 is in the ⁇ connection state.
  • FIG. 8 (A) and 8 (B) are diagrams showing windings in the Y connection state and the ⁇ connection state, respectively.
  • FIG. 8 (A) shows the connection state of the winding in the Y connection state
  • FIG. 8 (B) shows the connection state of the winding in the ⁇ connection state.
  • the electric power is in the Y connection state and the ⁇ connection state.
  • the power supplied to 40 is equal to each other. That is, when the electric power supplied to the motor 40 is equal to each other, the current is larger and the voltage required for driving is lower in the ⁇ connection state.
  • connection state it is conceivable to select the connection state according to the load conditions, etc. by utilizing the above properties. For example, it is conceivable to operate at a low speed in a Y-connected state when the load is low, and to operate at a high speed in a ⁇ -connected state when the load is high. By doing so, it is possible to improve efficiency at low load and high output at high load.
  • the counter electromotive force increases as the rotation speed increases, and the voltage value required for driving increases.
  • This counter electromotive force is higher in the Y-connected state than in the ⁇ -connected state as described above.
  • the current for obtaining the same output torque increases, so that the current flowing through the motor 40 and the inverter 30 increases, and the efficiency decreases.
  • connection state it is conceivable to switch the connection state according to the rotation speed of the motor. For example, when high-speed operation is required, the ⁇ connection state is set. By doing so, the voltage required for driving can be reduced to 1 / ( ⁇ 3) (compared to the voltage required in the Y connection state). Therefore, it is not necessary to reduce the number of turns of the winding, and it is not necessary to use the weakening magnetic flux control.
  • the current value can be reduced to 1 / ( ⁇ 3) compared to the case of the ⁇ connection state by setting the Y connection state.
  • the motor can be designed so that the windings are suitable for low-speed operation in the Y connection state, and the current value can be reduced as compared with the case where the Y connection is used over the entire speed range. It becomes. As a result, the loss of the inverter 30 can be reduced and the efficiency can be improved.
  • FIG. 9 is a waveform diagram showing an example of the current flowing through the winding through the mechanical relays 61, 62, 63 of the motor 40.
  • FIG. 9 shows an example of the current waveform before and after the connection switching.
  • the control device 50 has a function of switching the connection state during the rotation operation period in which the rotor of the electric motor 40 is rotating. Controlling the current flowing in the winding of the motor 40, that is, the value (effective value) of the current flowing in the mechanical relays 61, 62, 63 to zero as in the current control period Pc shown in FIG. Can be done.
  • the switching operation of the mechanical relays 61, 62, 63 can be performed in a state where no current is flowing through the mechanical relays 61, 62, 63, and an arc discharge is performed between the contacts of the mechanical relays 61, 62, 63. It does not occur. Therefore, contact welding of the mechanical relays 61, 62, and 63 can be prevented, and a highly reliable motor drive device can be realized.
  • FIG. 10A is a timing diagram showing switching from the Y connection to the ⁇ connection in the motor drive device 1 according to the embodiment
  • FIG. 10B is a timing diagram from the Y connection to the ⁇ connection in the motor drive device of the comparative example. It is a timing diagram which shows the switching to a connection.
  • the control device 50 sets the overcurrent threshold value Iover to either the first value I1 for Y connection and the second value I2 for ⁇ connection higher than the first value I1, and corresponds to the winding current.
  • a predetermined overcurrent protection operation is performed.
  • the overcurrent protection operation is, for example, stopping the inverter 30.
  • the overcurrent is overcurrent at the time point t13, which is longer than 1.0 times the switching delay time and within 5.0 times from the time point t11 of the output of the command signal S1. It is possible to switch the threshold value Iover.
  • the overcurrent threshold value Iover is set at a time point t13 between the output time point t11 of the command signal S1 and a time point t13 between 1.5 times the value of the first delay time P1 which is the switching delay time and a maximum of 1.0 second. It is possible to switch.
  • the control device 50 switches the connection state from the Y connection state to the ⁇ connection state and switches the overcurrent threshold Iover from the first value I1 to the second value I2, at least the command signal S1 is output to the connection switching unit 60. From the time point (time point t11 in FIG. 10A described later) to the time point when the switching of the states of the mechanical relays 61, 62, 63 is completed and the connection state is switched to the ⁇ connection state (time point t12 in FIG. 9A described later). ), The overcurrent threshold Iover is maintained at the first value I1 during the first delay time P1.
  • the control device 50 switches the connection state from the Y connection state to the ⁇ connection state and switches the overcurrent threshold value Iover from the first value I1 to the second value I2, the overcurrent occurs after the lapse of the first delay time P1.
  • FIG. 11A is a timing diagram showing switching from the ⁇ connection to the Y connection in the motor drive device 1 according to the embodiment
  • FIG. 11B is a timing diagram from the ⁇ connection in the motor drive device of the comparative example to Y. It is a timing diagram which shows the switching to a connection.
  • the control device 50 switches the connection state from the ⁇ connection state to the Y connection state and switches the overcurrent threshold value Iover from the second value I2 to the first value I1
  • the command signal S2 is output to the connection switching unit 60.
  • the overcurrent threshold value Iover is set to the first value I1.
  • the control device 50 switches the connection state from the ⁇ connection state to the Y connection state and switches the overcurrent threshold value Iover from the second value I2 to the first value I1, at the time point t21 when the second delay time P2 starts.
  • FIG. 12 is a flowchart showing an operation (step S100) when the connection state is switched from the Y connection state to the ⁇ connection state.
  • the control device 50 outputs a command signal S1 for switching the connection state of the electric motor 40 to the connection switching unit 60 (time point t11, step S101).
  • the states of the mechanical relays 61, 62, and 63 are switched to the ⁇ connection state (time point t12, step S102).
  • the control device 50 switches the overcurrent threshold value Iover from the first value I1 to the second value I2 (time point t13, step S103).
  • FIG. 13 is a flowchart showing an operation (step S200) when the connection state is switched from the ⁇ connection state to the Y connection state.
  • the control device 50 switches the overcurrent threshold value Iover from the second value I2 for ⁇ connection to the first value I1 for Y connection.
  • a command signal is generated to command that, and the overcurrent threshold value Iover is switched from the second value I2 to the first value I1 (time t20, step S201).
  • the control device 50 outputs a command signal S2 for switching the connection state of the electric motor 40 to the connection switching unit 60 (time point t21, step S202).
  • the states of the mechanical relays 61, 62, and 63 are switched to the ⁇ connection state (time point t22, step S203).
  • FIG. 14 is a flowchart showing the operation of the motor drive device 1 applied to the air conditioner 2.
  • the control device 50 outputs a command signal to the connection switching unit 60 to set the connection state of the motor 40 to the Y connection state (step S301).
  • the control device 50 sets the overcurrent threshold value Iover to the first value I1 for Y connection (step S302).
  • the control device 50 outputs a control signal to the inverter 30 to rotate and start the motor 40 (step S303), and controls the drive of the motor 40 in the Y-connected state (step S304).
  • the control device 50 While driving the motor 40 in the Y-connected state, the control device 50 controls the rotation speed of the motor 40 in response to a request for an air conditioning load from a control unit (not shown) of the air conditioner 2 (step S305). Next, the control device 50 determines whether or not the capacity of the air conditioning load is sufficient for the requirement of the air conditioning load. That is, the control device 50. It is determined whether the connection state suitable for the requirement of the air conditioning load is the Y connection state or the ⁇ connection state (step S306).
  • step S306 When the state suitable for the request in step S306 is the Y connection state, the control device 50 operates the motor 40 in the Y connection state (step S307). That is, if the current connection state is the Y connection state, the control device 50 continues the operation in the Y connection state, and if the current connection state is the ⁇ connection state, the switching shown as step S100 in FIG. Perform the operation.
  • step S306 When the state suitable for the request in step S306 is the ⁇ connection state, the control device 50 operates the motor 40 in the ⁇ connection state (step S308). That is, if the current connection state is the Y connection state, the control device 50 performs the switching operation shown as step S200 in FIG. 13, and if the current connection state is the ⁇ connection state, the control device 50 operates in the ⁇ connection state. To continue.
  • control device 50 determines whether or not there is an input of a drive stop command for the motor 40 (step S309), and if there is no drive stop command, the process is returned to step S305 to operate the motor 40. If it continues and there is a drive stop command, the drive stop signal is turned ON to stop the operation of the motor 40 (step S310).
  • the overcurrent threshold Iover is set from the first value I1 for Y connection at a time point t13 after the time point t12 when the state switching of the mechanical relays 61, 62, 63 is completed. It is switched to the second value I2 for ⁇ connection.
  • the overcurrent threshold value Iover is controlled so as not to switch to the second value I2, which is higher than the first value I1, of the motor 40. It does not cause a state in which an excessive current flows through the windings 41, 42, and 43. Therefore, irreversible demagnetization can be prevented from occurring in the permanent magnet of the motor 40.
  • the overcurrent threshold Iover is set from the second value I2 for ⁇ connection at the time point t20 before the time point t21 when the command signal S2 for switching the states of the mechanical relays 61, 62, 63 is output. Switch to the first value I1 for Y connection. In this way, the overcurrent threshold value Iover is switched to the first value I1 lower than the second value I2 before the time t21 when the command signal S2 for switching the states of the mechanical relays 61, 62, 63 is output.
  • the control does not cause a state in which an excessive current flows through the windings 41, 42, 43 of the electric motor 40. Therefore, irreversible demagnetization can be prevented from occurring in the permanent magnet of the motor 40.
  • connection switching unit 60 uses mechanical relays 61, 62, 63, the loss can be reduced as compared with the case where the semiconductor relay is used.
  • the connection state can be switched during the rotational operation period of the motor 40, the operation of the air conditioner 2 is not stopped and the comfort is maintained. It is possible to continue operation. Further, it is possible to suppress the occurrence of compressor failure due to the differential pressure activation of the compressor 901.
  • the connection state is changed to the Y connection state under the air conditioning light load condition, the first value I1 for the Y connection is adopted as the overcurrent threshold Iover, and the air is used.
  • the current value of the harmonizer 2 it is possible to improve the operating efficiency under intermediate conditions, which is an effective index for calculating the APF (Annual Performance Factor), and realize high efficiency.
  • the connection state is changed to the ⁇ connection state, and the second value I2 for the ⁇ connection is adopted as the overcurrent threshold value Iover, so that high power operation can be realized.
  • FIG. 15 is a circuit diagram showing an example of the winding of the motor and the other of the connection switching portion.
  • FIG. 15 describes an example in which an electric motor drive device is connected to an electric motor 40a capable of switching the number of turns of each of the windings 41, 42, and 43.
  • the windings 41, 42, and 43 of each phase are composed of two or more winding portions.
  • both ends of each of the two or more winding portions constituting the windings 41, 42, 43 of each phase can be connected to the outside of the motor 40a, and the windings 41, 42, 43 are connected by the connection switching portion 60. Switch the connection state of.
  • the connection switching unit 60 can also be applied to an electric motor capable of switching the winding portion to either parallel connection or series connection.
  • the windings of each phase are composed of two winding portions, and both ends of the winding portions can be connected to the outside of the motor 40a.
  • the configuration for switching the connection state is shown with.
  • the U-phase winding 41 is composed of two winding portions 411 and 412
  • the V-phase winding 42 is composed of two winding portions 421 and 422
  • the W-phase winding 43 is composed of two winding portions 421 and 412. It is composed of two winding portions 431 and 432.
  • the first ends of the winding portions 411, 421 and 431 are connected to the output lines 331, 332 and 333 of the inverter 30 via the external terminals 41c, 42c and 43c, respectively.
  • the second ends of the winding portions 411, 421 and 431 are connected to the common contacts of the mechanical relays 617, 627 and 627 via external terminals 41 g, 42 g and 43 g, respectively.
  • the first ends of the winding portions 412, 422, 432 are connected to the common contacts of the mechanical relays 618, 628, 638 via the external terminals 41h, 42h, 43h, respectively.
  • the second ends of the winding portions 412, 422, and 432 are connected to the neutral node 64 via the external terminals 41d, 42d, and 43d, respectively.
  • the normally closed contacts of the mechanical relays 617, 627 and 637 are connected to the normally closed contacts of the mechanical relays 618, 628 and 638, respectively.
  • the normally open contacts of the mechanical relays 617, 627, 637 are connected to the neutral node 64.
  • the normally open contacts of the mechanical relays 618, 628, and 638 are connected to the output lines 331, 332, and 333 of the inverter 30.
  • the connection switching unit 60 is composed of mechanical relays 617, 627, 637, 618, 628, and 638.
  • connection switching unit 60 Even when such a connection switching unit 60 is used, the mechanical relay of the connection switching unit 60 can be switched during the current control period Pc in the same manner as shown in FIG.

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PCT/JP2020/017432 2020-04-23 2020-04-23 電動機駆動装置及び空気調和機 WO2021214925A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023144881A1 (ja) * 2022-01-25 2023-08-03 三菱電機株式会社 電動機駆動装置及び空気調和機

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Publication number Priority date Publication date Assignee Title
JP2008228513A (ja) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp 電動機駆動装置および電動機駆動方法並びに冷凍空調装置
WO2019021373A1 (ja) * 2017-07-25 2019-01-31 三菱電機株式会社 駆動装置、圧縮機、空気調和機および駆動方法
JP6570797B1 (ja) * 2019-01-23 2019-09-04 三菱電機株式会社 回転機制御装置、冷媒圧縮装置及び空気調和機

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JP2008228513A (ja) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp 電動機駆動装置および電動機駆動方法並びに冷凍空調装置
WO2019021373A1 (ja) * 2017-07-25 2019-01-31 三菱電機株式会社 駆動装置、圧縮機、空気調和機および駆動方法
JP6570797B1 (ja) * 2019-01-23 2019-09-04 三菱電機株式会社 回転機制御装置、冷媒圧縮装置及び空気調和機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023144881A1 (ja) * 2022-01-25 2023-08-03 三菱電機株式会社 電動機駆動装置及び空気調和機

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