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Control System of Permanent Magnet Synchronous Motor

A technology of permanent magnet synchronous motor and control system, applied in the direction of speed/torque control of a single motor, can solve the problems of control chip running away, hidden danger of software protection, crash and other problems, and achieve clear control, convenient design and normalization application, improve the effect of robustness

Pending Publication Date: 2018-12-18
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The control chip that runs the software program has runaway and crash conditions. Once it fails to work normally, the software will not be able to execute the protection program. Therefore, there are certain security risks in a single software protection method; how to effectively carry out protection and safety design become a continuing problem
[0005] (2) The input and output switches of the main circuit of the motor control system are not disconnected when the fault occurs. Since the operation of the inverter is only stopped, the diode rectifier bridge is not controlled, so the DC voltage of the rectified output always exists, which will also cause safety problems.

Method used

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  • Control System of Permanent Magnet Synchronous Motor
  • Control System of Permanent Magnet Synchronous Motor
  • Control System of Permanent Magnet Synchronous Motor

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Experimental program
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Embodiment 1

[0031] The control system of the permanent magnet synchronous motor of the present invention comprises a three-phase AC power supply 1, a rectifier bridge 2, an inverter bridge 3, a control board 6, a PWM drive module 7, and a bus bar arranged between the two output terminals of the rectifier bridge Capacitor 5, detection and protection circuit 8, and permanent magnet synchronous motor 4; Described detection and protection circuit board comprises signal acquisition unit, in order to the conditioning circuit that the output of described signal acquisition unit is carried out standard unit, and with described A protection circuit connected to the output of the conditioning circuit, the signal acquisition unit includes a phase voltage acquisition unit and a current acquisition unit, the protection circuit includes an OR gate, and the two input terminals of the OR gate are respectively connected to the phase voltage acquisition unit and the current acquisition unit The output of th...

Embodiment 2

[0038] In order to effectively cut off the input of the rectifier bridge side, the control system of the present invention also includes an input-side DC contactor, and the three pairs of contacts 12 of the input-side DC contactor are correspondingly connected in series to the input phase of the rectifier bridge, The output end of the protection circuit is connected to the DC contactor 30 at the input side. That is, the output of the protection circuit is connected to the base of the triode T1 through the inverter 28, the relay coil of the input-side DC contactor is connected in series to the collector of the triode and the other end is connected to 24V, and the triode The emitter is grounded. The input side contactor 12 is directly controlled by the detection and protection circuit 8, and the detection and protection circuit 8 judges whether there is overcurrent or overvoltage. If a fault occurs, the protection signal is input into the PWM drive module 7, and the PWM drive mo...

Embodiment 3

[0043] On the basis of the above-mentioned embodiments, it also includes a pre-charging circuit to prevent current overcurrent when charging the bus capacitor, and the pre-charging circuit includes a charging resistor 14 arranged at the positive output end of the rectifier bridge, a DC conversion power supply 16 and an over-current prevention circuit. DC contactor, wherein the input end of the DC conversion power supply is connected to the output of the rectifier bridge, the relay coil of the overcurrent prevention DC contactor is connected in series with the output side of the DC conversion power supply, and the overcurrent protection A pair of normally open contacts 13 of the current overcurrent prevention DC contactor are arranged in parallel with the charging resistor 14 . Wherein, the output of the DC conversion power supply is 24V DC, and the overcurrent preventing DC contactor is a 24V DC contactor.

[0044] Wherein, the output of the DC conversion power supply is 24V D...

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Abstract

The invention discloses a control system of a permanent magnet synchronous motor, comprising a rectifier bridge, an inverter bridge, a control board, a PWM driving module and a detection and protection circuit. The detection and protection circuit board comprises a signal acquisition unit, a conditioning circuit for standardizing the output of the signal acquisition unit, and a protection circuitconnected to the output of the conditioning circuit, The signal acquisition unit comprises a phase voltage acquisition unit and a current acquisition unit. The protection circuit comprises an OR gate.Two input terminals of the OR gate are respectively connected with the outputs of the conditioning circuits corresponding to the phase voltage acquisition unit and the current acquisition unit. The output terminal of the OR gate is connected to the PWM driving module. At that same time, the signal is subject to standardization processing, and the overall circuit control is clear. The invention adopts the collect hardware circuit to directly control the PWM driving module after the signal is sorted, thereby effectively improving the robustness of the control. The signal conditioning circuit isused to unify the interface signal level of current and voltage, which is convenient for the design and normalization application of the detection circuit.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a control system of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have the advantages of high energy density, long life, no pollution, and easy maintenance, and have been widely used in industrial control, energy transportation, military equipment and other fields. The main circuit of the control system of a permanent magnet synchronous motor is usually composed of a diode rectifier and an inverter. When a fault or abnormal situation occurs, the PWM (pulse width modulation) signal is generally blocked by software, and the PWM module is controlled to turn off the drive signal and stop the inverter. This method is suitable for most fault situations, but the single software protection method still controls the normal operation of the circuit seriously. Once the control circuit fails, it will not work normall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08
CPCH02P6/08
Inventor 魏振姚广赵楠任祥正张楠
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND