Torque pulsation restraining system and method of permanent magnet brushless direct current motor

Abstract

The invention relates to a torque pulsation restraining system and method of a permanent magnet brushless direct current motor. During no phase change, a direct current power supply is directly connected with a three-phase inverter bridge through a selector switch, and is used as a motor input voltage; when detecting the phase change, a phase change detection module immediately sends a control signal to enable the selector switch to switch, the output of the direct current power supply is connected with the three-phase inverter bridge after the voltage of a Quasi-Z source network is regulated, the direct current bus voltage of the motor inverter bridge during phase change is regulated through the Quasi-Z source network to ensure that the turn-off phase current drop rate is equal to the turn-on phase current raising rate, therefore phase change torque pulsation of different forms of the permanent magnet brushless direct current motor can be effectively inhibited, and the reduced phase change torque can be compensated when at high speed, and the increased phase change torque can be eliminated when at low speed.

Description

technical field [0001] The invention relates to a motor control technology, in particular to a permanent magnet brushless DC motor torque ripple suppression system and method. Background technique [0002] With the rapid development of rare earth permanent magnet materials and power electronics technology, brushless DC motor and its control technology have been developed rapidly. The permanent magnet brushless DC motor has outstanding advantages such as large output torque, high power density, wide speed range, fast dynamic response, small inertia, high reliability, and simple control. Therefore, it is widely used in aerospace, robotics, household appliances and office Applications in areas such as automation are becoming more and more widespread. [0003] The permanent magnet brushless DC motor adopts the two-to-two conduction operation mode, and the commutation torque ripple that occurs every 60° in the operation process is one of the main problems in the permanent magnet...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the torque ripple of the permanent magnet brushless DC motor is relatively large during commutation, and proposes a system and method for suppressing the torque ripple of the permanent magnet brushless DC motor. The Quasi-Z source network is added to the front end of the type inverter bridge, and the input voltage of the permanent magnet brushless DC motor is adjusted during the commutation process to solve the problem of torque ripple

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