Method for restraining torque ripple of permanent magnet motor based on direct torque control

Abstract

The invention discloses a method for restraining torque ripple of a permanent magnet motor based on direct torque control. The direct torque control strategy is adopted in the permanent magnet motor, an additional harmonic torque is directly added based on a given electromagnetic torque so that amplitudes of fundamental components and higher harmonic components in the additional harmonic torque and a position torque are equal and the opposite phases of the fundamental components and the higher harmonic components are opposite and are counterbalanced so as to restrain the torque ripple. The invention is suitable for manufactured motors or purchased finished motors, and particularly permanent magnet motors with larger position torque. The invention has the advantages of low cost by only modifying the control software instead of increasing a drive control cost of the motor, and simplicity, validity and good universality.

Description

Technical field [0001] The invention is a control technique for suppressing the torque ripple of a permanent magnet motor by directly injecting additional harmonic torque, belonging to the technical field of motor drive and control, and is a method for suppressing the torque ripple of a permanent magnet motor based on direct torque control. Background technique [0002] With the increasing development of science and technology, especially microprocessor technology, power electronics technology, high-performance permanent magnet material manufacturing technology, and the huge progress made in automatic control technology, various high-performance permanent magnet motors are the main actuators. Drives and servo control systems have been developed rapidly. However, in a permanent magnet motor, even when the motor windings are open, the motor also presents a periodic pulsating torque, which is caused by the interaction between the variable reluctance formed by the stator and rotor co...

AI Technical Summary

Problems solved by technology

However, due to the constraints of different types of motor structures, the reduction of motor torque ripple is limited

In addition, this type of optimization design method for the motor body will not only reduce the torque ripple of the motor, but also affect the no-load back electromotive force, torque output capability, power density and other performance of the motor, and increase the manufacturing cost at the same time. In the actual industry There are certain limitations in the process of

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