CN109194207B - Control system of permanent magnet synchronous motor with position sensor - Google Patents
Control system of permanent magnet synchronous motor with position sensor Download PDFInfo
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- CN109194207B CN109194207B CN201811252109.9A CN201811252109A CN109194207B CN 109194207 B CN109194207 B CN 109194207B CN 201811252109 A CN201811252109 A CN 201811252109A CN 109194207 B CN109194207 B CN 109194207B
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- operational amplifier
- direct current
- position sensor
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/17—Circuit arrangements for detecting position and for generating speed information
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0805—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for synchronous motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0822—Integrated protection, motor control centres
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a control system of a permanent magnet synchronous motor with a position sensor, which comprises a rectifier bridge, an inverter bridge, a control board, a PWM driving module, a detection protection circuit, a can communication unit and a position sensor, wherein the PWM driving module, the detection protection circuit, the can communication unit and the position sensor are respectively and electrically connected with the control board, the detection protection circuit comprises a direct-current voltage signal acquisition unit, a phase current signal acquisition unit and an OR gate, and the output of the OR gate is controllably connected with the PWM driving module. The invention realizes the functions of under-voltage, over-voltage protection, current overcurrent protection and the like of the direct-current voltage end of the frequency converter, ensures that any protection signal can be directly blocked by hardware through an OR gate, and can effectively complete protection even if the software protection function fails. The direct-current voltage signal acquisition unit is directly connected with the positive end and the negative end of the direct-current bus, does not adopt any voltage sensor, but adopts the direct-current bus voltage signal, and improves the speed of signal acquisition.
Description
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a control system of a permanent magnet synchronous motor with a position sensor.
Background
The permanent magnet synchronous motor has the advantages of high energy density, long service life, no pollution, easy maintenance and the like, and is widely applied to the fields of industrial control, energy traffic, military equipment and the like. The main circuit of the permanent magnet synchronous motor control system is generally composed of a diode rectifier and an inverter, when faults or abnormal conditions occur, a PWM (pulse width modulation) signal is blocked through software, a PWM module is controlled to close a driving signal, and the inverter is stopped to perform protection, and the method is suitable for most fault conditions, however, a single software protection method still controls the normal operation of the circuit seriously, once the control circuit fails, the control circuit cannot work normally, and meanwhile, the software protection method lacks protection for main circuit devices.
In addition, the existing protection circuit generally performs voltage acquisition through a sensor, so that the cost and the processing time are increased, and meanwhile, the monitoring factors are few, so that long-time stable operation of the motor is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a control system of a permanent magnet synchronous motor with a position sensor, which can effectively improve the safety of integral control.
The invention is realized by the following technical scheme:
the control system of the permanent magnet synchronous motor with the position sensor comprises a rectifier bridge, an inverter bridge, a control board, a PWM driving module, a detection protection circuit, a can communication unit and a position sensor, wherein the PWM driving module, the detection protection circuit, the can communication unit and the position sensor are respectively and electrically connected with the control board, the detection protection circuit comprises a direct-current voltage signal acquisition unit, a phase current signal acquisition unit and an OR gate, the output of the OR gate is controllably connected with the PWM driving module,
the direct-current voltage signal acquisition unit comprises a first operational amplifier, wherein a positive input end and a negative input end are respectively connected with two ends of direct-current voltage through a voltage dividing circuit, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a capacitor C2 and a resistor R4 which are connected in parallel, and the output end of the first operational amplifier is connected with the OR gate after being filtered;
the phase current signal acquisition unit comprises a second operational amplifier and a third operational amplifier, wherein the positive input end and the negative input end of the second operational amplifier are respectively connected with two output ends of the current sensor after passing through a current limiting resistor, the positive electrode of the second operational amplifier is grounded through a filter capacitor C4 and a filter resistor R3 which are connected in parallel, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier after passing through a capacitor C2 and a resistor R4 which are connected in parallel, the output of the second operational amplifier is connected with the positive input end of the third operational amplifier after being divided, the negative input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output of the third operational amplifier is connected with the OR gate after being filtered.
In the above technical scheme, the output of the detection protection circuit is connected with the base electrode of the triode T1 through the optical coupling isolation chip, the relay of the triode T1 is connected with the input contactor coil Ts in series and is connected with 24V, the emitter is grounded, and the three pairs of normally-closed contacts of the input contactor are connected with the three-phase input end of the rectifier bridge in series.
In the above technical scheme, the device further comprises a pre-charging circuit for preventing current from flowing excessively when the bus capacitor is charged, the pre-charging circuit comprises a charging resistor arranged at the positive output end of the rectifier bridge, a direct current conversion power supply and an overcurrent-preventing direct current contactor, wherein the input end of the direct current conversion power supply is connected with the output of the rectifier bridge, a relay coil of the overcurrent-preventing direct current contactor is connected in series with the output side of the direct current conversion power supply, and a pair of normally open contacts of the overcurrent-preventing direct current contactor are arranged in parallel with the charging resistor.
In the above technical scheme, the output of the dc conversion power supply is 24V dc, and the anti-overcurrent dc contactor is a 24V dc contactor.
In the above technical scheme, the power supply system further comprises a direct current power supply, wherein the direct current power supply comprises a direct current redundancy module taking U, V phases in a three-phase input power supply as input, and a plurality of direct current power supply modules connected with the output ends of the direct current redundancy module in parallel, and the direct current power supply modules respectively supply power for the control board, the detection protection circuit, the voltage detection circuit and the PWM driving module.
In the above technical scheme, the control board is a DSP control board, and further comprises a display device in communication connection with the DSP control board.
In the above technical solution, the display device is an LCD display device, which communicates with the DSP control board in an RS232 manner.
In the above technical scheme, the display device further comprises a memory chip in communication with the DSP control board, and the DSP is connected with the LCD display device through the isolation chip and the communication chip.
In the above technical scheme, the Controller Area Network (CAN) communication unit is also included for communicating with the control panel.
In the above technical scheme, the CAN communication unit is a CAN chip with isolation.
In the above technical scheme, the terminal of the position sensor is connected with the DSP control board via the voltage conversion chip.
The invention has the advantages and beneficial effects that:
the functions of undervoltage, overvoltage protection, current overcurrent protection and the like of the direct-current voltage end of the frequency converter are realized, any protection signal can be ensured to be directly blocked by hardware through an OR gate, and even if the software protection function fails, the protection can be effectively completed. The direct current voltage signal acquisition unit is directly connected with the positive end and the negative end of the direct current bus, no voltage sensor is adopted, and a voltage dividing resistor is adopted to change a direct current bus voltage signal of about 540V into a direct current signal of 24V, so that the signal acquisition speed is improved.
Drawings
Fig. 1 is a block diagram of a permanent magnet synchronous motor control system.
Fig. 2 is a schematic diagram of an input side structure of the dc power supply module.
Fig. 3 is a schematic diagram of a power supply portion of the dc power supply module.
Fig. 4 is a schematic diagram showing a memory structure of an LCD.
Fig. 5 is a schematic diagram of an isolated CAN communication unit.
Fig. 6 is a schematic diagram of a dc voltage signal acquisition unit of the detection protection circuit.
Fig. 7 is a schematic diagram of a phase current signal acquisition unit of the detection protection circuit.
Fig. 8 is a schematic diagram of a control portion of the detection protection circuit.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.
Example 1
The invention relates to a control system of a permanent magnet synchronous motor with a position sensor, which comprises a three-phase alternating current power supply 1, a rectifier bridge 2, an inverter bridge 3, a control board 6, a permanent magnet synchronous motor 4, a bus capacitor 13 connected between two output ends of the rectifier bridge 2 in series, an input contactor 14, a PWM driving module 7, a detection protection circuit 10, a can communication unit 16 and a position sensor 15, wherein the PWM driving module 7 is respectively and electrically connected with the control board, the detection protection circuit comprises a direct current voltage signal acquisition unit, a phase current signal acquisition unit and an OR gate, the output of the OR gate is connected with the PWM driving module,
the direct-current voltage signal acquisition unit comprises a first operational amplifier, wherein the positive input end and the negative input end of the first operational amplifier are respectively connected with input voltage through resistors, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a capacitor C2 and a resistor R4 which are connected in parallel, and the output end of the first operational amplifier is connected with the OR gate after being filtered;
the phase current signal acquisition unit comprises a second operational amplifier and a third operational amplifier, wherein the positive input end and the negative input end of the second operational amplifier are respectively connected with the two current input ends after passing through a current limiting resistor, the positive electrode of the second operational amplifier is grounded through a filter capacitor C4 and a filter resistor R3 which are connected in parallel, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier after passing through a capacitor C2 and a resistor R4 which are connected in parallel, the output of the second operational amplifier is connected with the positive input end of the third operational amplifier after being divided, the negative input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output of the third operational amplifier is connected with the OR gate after being filtered.
The functions of undervoltage, overvoltage protection, current overcurrent protection and the like of the direct-current voltage end of the frequency converter are realized, any protection signal can be ensured to be directly blocked by hardware through an OR gate, and even if the software protection function fails, the protection can be effectively completed. The direct current voltage signal acquisition unit is directly connected with the positive end and the negative end of the direct current bus, no voltage sensor is adopted, and a voltage dividing resistor is adopted to change a direct current bus voltage signal of about 540V into a direct current signal of 24V, so that the signal acquisition speed is improved.
The output of the detection protection circuit is connected with the base electrode of the triode T1 through the optical coupling isolation chip, the relay of the triode T1 is connected with the coil Ts of the input contactor in series and is connected with 24V, and the emitter is grounded. The three pairs of normally closed contacts of the input contactor are connected in series with the three-phase input end of the rectifier bridge. The detection protection circuit can directly control the on-off of the input contactor, and directly open the normally closed contact of the input contactor 14 during protection.
The specific connection mode of the permanent magnet motor control system and the main circuit protection device is shown in the figure:
the resistor R1 is connected to the feedback voltage VolInput1 port, the other end is connected to the resistor R4, the capacitor C2, and the negative terminal of the operational amplifier 24, and the other ends of the resistor R4 and the capacitor C2 are connected to the output terminal of the operational amplifier 24. The resistor R2 is connected to the feedback voltage VolInput2 port, the other end is connected to the resistor R3, the capacitor C1, and the positive end of the operational amplifier 24, and the other ends of the resistor R3 and the capacitor C1 are connected to AGND. One end of the resistor R5 is connected to the output terminal of the operational amplifier 24, and the other end is connected to the capacitor C3, the negative electrode of the diode D7, and the positive electrode of the diode D8. The other end of the capacitor C3 and the positive electrode of the diode D7 are connected to AGND, the negative electrode of the diode D8 is connected to 3.3V, and the voltage output signal is connected to the positive electrode of the diode D8 and the negative electrode of the diode D7.
The resistor R6 is connected with the feedback current CurInput1 port, the other end is connected with the resistor R8, the capacitor C5 and the negative end of the operational amplifier 16, and the other ends of the resistor R8 and the capacitor C5 are connected with the output end of the operational amplifier 25. The resistor R7 is connected to the feedback current CurInput2 port, the other end is connected to the resistor R9, the capacitor C4, and the positive end of the operational amplifier 25, and the other ends of the resistor R9 and the capacitor C4 are connected to AGND. One end of the resistor R10 is connected to the output terminal of the operational amplifier 25, the other end is connected to the resistor R11 and the positive terminal of the operational amplifier 17, one end of the resistor R11 is connected to 3.3V, and the other end is connected to the positive terminal of the operational amplifier 17. The negative terminal of the operational amplifier 17 is connected to the output terminal thereof, and the output terminal of the operational amplifier 17 is connected to the capacitor C6, the negative electrode of the diode D10, and the positive electrode of the diode D9. The other end of the capacitor C6 and the positive electrode of the diode D10 are connected to AGND, the negative electrode of the diode D9 is connected to 3.3V, and the current output signal is connected to the positive electrode of the diode D9 and the negative electrode of the diode D10.
The protection signal Pro is connected with a resistor R12, the other end of the resistor R12 is connected with an optical coupling isolation chip (model is TCM 1600) 27 and a capacitor C7, and the other end of the capacitor C7 is connected with GND. Connected to 3.3V. The 2 end and the 4 end of the optocoupler isolation chip 27 are respectively connected with the GDN and +24V. The 3-terminal of the optocoupler isolation chip 27 is connected to a resistor R13, the other end of the resistor R13 is connected to resistors R14 and R15, and the other end of the resistor R14 is connected to AGND. The other end of the resistor R15 is connected with the base electrode of the triode T1, and the emitter electrode of the triode T1 is connected with the AGND. The collector of the triode T1 is connected with the anode of the diode D11 and the relay coil Ts, and the cathode of the diode D11 and the other end of the relay coil Ts are connected with +24V.
The terminals of the position sensor 15 are connected to the DSP control board 6 via a voltage conversion chip. Specifically, the terminals of the position sensor (encoder) 15 are connected to A1, A2, and A3 of the voltage conversion chip 22 (model TXB 0106), vccA and GNDA of the voltage conversion chip 22 are connected to +5v power supply and GND, respectively, and the output terminals B1, B2, and B3 of the voltage conversion chip 22 are connected to GPIO20, GPIO21, and GPIO23 of the DSP control board 6, respectively. VccB and GNDB of the voltage conversion chip 22 are connected to +3.3V power supply and GND, respectively. The voltage conversion chip converts the 5V level of the position sensor 15 into the 3.3V level which can be received by the DSP, and meanwhile, the voltage conversion chip plays a certain role in isolation and interference resistance.
Example two
On the basis of the embodiment, the pre-charging circuit further comprises a pre-charging circuit for preventing current from flowing excessively when the bus capacitor is charged, the pre-charging circuit comprises a charging resistor 11 arranged at the positive electrode output end of the rectifier bridge, a direct current conversion power supply 8 and an overcurrent-preventing direct current contactor, wherein the input end of the direct current conversion power supply is connected with the output end of the rectifier bridge, a relay coil of the overcurrent-preventing direct current contactor is connected in series with the output side of the direct current conversion power supply, and a pair of normally open contacts 12 of the overcurrent-preventing direct current contactor are arranged in parallel with the charging resistor. Preferably, the output of the direct current conversion power supply is 24V direct current, and the anti-overcurrent direct current contactor is a 24V direct current contactor.
The output of the direct current conversion power supply is 24V direct current, and the anti-overcurrent direct current contactor is 24V anti-overcurrent direct current contactor. The direct-current voltage output by the rectifier bridge is the input voltage of the direct-current conversion power supply, the direct-current conversion power supply is equivalent to a step-down power supply, the input end voltage of the direct-current conversion power supply is smaller in the initial stage of charging the bus capacitor, when the bus capacitor tends to be saturated, the input end voltage of the direct-current conversion power supply is gradually increased, the output voltage of the direct-current conversion power supply can reach 24V only when the direct-current voltage output by the rectifier bridge reaches about 480V, and the direct-current contactor can be attracted only by 24V, so that the charging resistor is short-circuited. When three-phase electricity is disconnected or the rectifier bridge fails, the direct current voltage output by the rectifier bridge continuously drops, when the voltage is lower than 480V, the direct current conversion power supply cannot output 24V direct current, the overcurrent-preventing direct current contactor is disconnected, the charging resistor is connected in series to the circuit again, the discharging safety of the bus capacitor is effectively ensured, the whole process is free of external signal control, simplicity and reliability are realized, the control is stable and high completely depending on whether the bus capacitor reaches a corresponding voltage value, the direct current voltage source control contactor connected in parallel to two sides of the bus capacitor replaces an original DSP control signal, and the charging resistor can be automatically attracted only if the direct current voltage output by the diode rectifier reaches a certain value, short circuit is realized, and DSP control is not needed.
Example III
The invention also comprises a direct current power supply with an input end connected with alternating current, wherein the direct current power supply comprises a direct current redundancy module 18 taking U, V phases in a three-phase input power supply as input, and a plurality of direct current power supply modules connected with the output ends of the direct current redundancy module 18 in parallel, and the direct current power supply modules respectively supply power for the control board, the detection protection circuit, the voltage detection circuit and the PWM driving module. The redundant power supply mode is adopted, the redundant capacity of the control power of the system is enhanced, the stable supply of direct current is ensured, and the probability of disconnection of the control power caused by phase failure of the system is reduced.
Specifically, as shown in the figure, the dc power supply 9 provides power for the DSP control board 6 and the LCD display input 10, where the dc power supply 9 firstly adopts a bright dc redundancy module to provide 24V dc, where the dc redundancy module 18 can select a dc redundancy module DR-RDN20 of a bright weft power supply, the module adopts a redundancy design, uses U, V phases in a three-phase input power supply as inputs, U, V phases are standby, and generates +24v dc, so that the control power can be ensured to be normal to the greatest extent. Then 24V is converted into +5V, + -15V and +3.3V respectively by a direct current power supply module (model is IB2405LS-1W, WRA2415S-3W and K7803-500R 2) of Jin Shengyang company, and the specific connection modes are as follows:
the +24 signal of the dc redundancy module 18 is connected to the positive electrodes of the capacitors DVC1 and DVC2 and Vin of the first dc module 18, the negative electrodes of the capacitors DVC1 and DVC2 are connected to GND and GND of the first dc module 18, the +5v signal, the positive electrode of the capacitor DVC3, and one end of the DVR1 are connected to Vout of the first dc module 18, and the negative electrode of the capacitor DVC3 is connected to 0V of the first dc module 18.
The +24 signal of the dc redundancy module 18 is connected to the positive electrodes of the capacitors DVC4 and DVC5 and Vin of the second dc module 19, the negative electrodes of the capacitors DVC4 and DVC5 are connected to GND and GND of the second dc module 19, the +15v signal, the positive electrodes of the capacitors DVC6 and DVC7 are connected to v+ of the second dc module 19, and the negative electrodes of the capacitors DVC6 and DVC7 are connected to 0V of the second dc module 19. The positive electrodes of the capacitors DVC8 and VC9 are connected with 0V of the second DC module 19, and the negative electrodes of the capacitors DVC8 and DVC9 are connected with V of the DC module 19.
The +24 signal of the dc redundancy module 18 is connected to the positive electrodes of the capacitors DVC10 and DVC11 and Vin of the third dc module 20, the negative electrodes of the capacitors DVC10 and DVC11 are connected to GND and GND of the third dc module 20, the +3.3v signal, the positive electrode of the capacitor DVC12 are connected to Vout of the third dc module 20, and the negative electrode of the capacitor DVC12 is connected to GND.
Example IV
The control board is a DSP control board and also comprises a display device which is in communication connection with the DSP control board. Specifically, the display device is an LCD display device, which communicates with the DSP control board in an RS232 mode, and further comprises a memory chip which communicates with the DSP control board, wherein the DSP is connected with the LCD display device through a communication chip.
The system also comprises a storage chip communicated with the DSP control board, the DSP IS connected with the LCD display device through the communication chip, and meanwhile, in order to prevent interference, an IS07221 isolation chip IS adopted to isolate signals, so that the anti-interference performance IS further improved, and the storage unit adopts an AT2404 chip to store main parameters of a motor control system. And an isolation chip is added, so that the anti-interference capability and stability of communication are improved.
The specific connection is as follows:
the terminals A0, A1, A2, VSS and WP of the memory chip 22 are connected to GND, VCC is connected to +5v, and SCL and SDA are connected to GPIO33 and GPIO32 of the DSP control board 6, respectively. GPIO14 and GPIO13 of the DSP control board 6 are respectively connected with INA and OUTA of the isolation chip 23, VCCA and GNDA of the isolation chip 23 are respectively connected with +3.3V and GND, OUTB and INB of the isolation chip 23 are respectively connected with SCITX and SCITX ends of the communication chip 24, and VCCB and GNDB of the isolation chip 23 are respectively connected with +3.3V and DGND. The tx+, tx-, rx+, rx-terminals of the communication chip 24 are connected to the 2, 3, 4, 6 terminals of the LCD display input 10, respectively.
The controller area network also comprises a CAN communication unit which is communicated with the control board, wherein the CAN communication unit is a CAN chip with isolation. The connection mode is as follows:
the CAN communication terminals are connected to CANH and CANL of the CAN communication chip 23 (model SN65HVD 230), respectively, and VCC and GND of the CAN communication chip 23 are connected to +3.3v power supply and GND, respectively. Vss of the CAN communication chip 23 is connected to GND. TxD and RxD of the CAN communication chip 23 are connected to GPIO31 and GPIO30 of the DSP control board 6, respectively.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature's illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "lower" may encompass both an upper and lower orientation. The device may be otherwise positioned (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. The control system of the permanent magnet synchronous motor with the position sensor is characterized by comprising a rectifier bridge, an inverter bridge, a control board, a PWM driving module, a detection protection circuit, a CAN communication unit and a position sensor, wherein the PWM driving module, the detection protection circuit, the CAN communication unit and the position sensor are respectively and electrically connected with the control board, the detection protection circuit comprises a direct-current voltage signal acquisition unit, a phase current signal acquisition unit and an OR gate, the output of the OR gate is controllably connected with the PWM driving module,
the direct-current voltage signal acquisition unit comprises a first operational amplifier, wherein a positive input end and a negative input end are respectively connected with two ends of direct-current voltage through a voltage dividing circuit, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a capacitor C2 and a resistor R4 which are connected in parallel, and the output end of the first operational amplifier is connected with the OR gate after being filtered;
the phase current signal acquisition unit comprises a second operational amplifier and a third operational amplifier, wherein the positive input end and the negative input end of the second operational amplifier are respectively connected with the two output ends of the current sensor after passing through a current limiting resistor, the positive electrode of the second operational amplifier is grounded through a filter capacitor C4 and a filter resistor R3 which are connected in parallel, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier after passing through a capacitor C2 and a resistor R4 which are connected in parallel, the output of the second operational amplifier is connected with the positive input end of the third operational amplifier after being divided, the negative input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output of the third operational amplifier is connected with the OR gate after being filtered; the output of the detection protection circuit is connected with the base electrode of the triode T1 through the optical coupling isolation chip, the relay of the triode T1 is connected with the input contactor coil Ts in series and is connected with 24V, the emitter is grounded, the three pairs of normally-closed contacts of the input contactor are connected with the three-phase input end of the rectifier bridge in series, and the CAN communication unit is a CAN chip with isolation.
2. The control system for a permanent magnet synchronous motor with a position sensor according to claim 1, wherein: the pre-charging circuit comprises a charging resistor arranged at the positive electrode output end of the rectifier bridge, a direct current conversion power supply and an overcurrent-preventing direct current contactor, wherein the input end of the direct current conversion power supply is connected with the output of the rectifier bridge, a relay coil of the overcurrent-preventing direct current contactor is connected in series with the output side of the direct current conversion power supply, and a pair of normally open contacts of the overcurrent-preventing direct current contactor are arranged in parallel with the charging resistor.
3. A control system for a permanent magnet synchronous motor with a position sensor according to claim 2, wherein: the output of the direct current conversion power supply is 24V direct current, and the overcurrent-preventing direct current contactor is a 24V direct current contactor.
4. A control system for a permanent magnet synchronous motor with a position sensor according to claim 1, wherein: the direct current power supply comprises a direct current redundancy module taking U, V phases in a three-phase input power supply as input, and a plurality of direct current power supply modules connected with the output ends of the direct current redundancy module in parallel, wherein the direct current power supply modules respectively supply power for the control board, the detection protection circuit, the voltage detection circuit and the PWM driving module.
5. A control system for a permanent magnet synchronous motor with a position sensor according to claim 1, wherein: the control board is a DSP control board and also comprises a display device which is in communication connection with the DSP control board.
6. A control system for a permanent magnet synchronous motor with a position sensor according to claim 5, wherein: the display device is an LCD display device, and is communicated with the DSP control board in an RS232 mode.
7. A control system for a permanent magnet synchronous motor with a position sensor according to claim 5, wherein: the system also comprises a storage chip communicated with the DSP control board, and the DSP is connected with the LCD display device through the isolation chip and the communication chip.
8. A control system for a permanent magnet synchronous motor with a position sensor according to claim 1, wherein: the controller also comprises a CAN communication unit which is communicated with the control panel.
9. A control system for a permanent magnet synchronous motor with a position sensor according to claim 1, wherein: the terminal of the position sensor is connected with the DSP control board through the voltage conversion chip.
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| JP4279886B2 (en) * | 2007-02-28 | 2009-06-17 | 株式会社日立製作所 | Synchronous motor driving apparatus and method |
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| CN109194207A (en) | 2019-01-11 |
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