Method for reducing torque ripple of five-phase embedded permanent magnet motor

Abstract

The invention discloses a method for reducing the torque ripple of a five-phase embedded permanent magnet motor. According to the invention, a stator magnetomotive force model is established. An equivalent magnetic circuit diagram of the motor is extracted, and an odd harmonic part in the rotor magnetomotive force is converted into an even harmonic part according to the interaction principle between the stator magnetomotive force and the rotor magnetomotive force of the motor. In this way, the permanent magnet torque ripple is reduced. Meanwhile, an optimal extreme arc coefficient ratio underthe condition of an asymmetric magnetic pole structure is solved. On the basis of the asymmetric magnetic pole structure, the repeated units of a permanent magnet magnetic pole are determined. The angle of one-time offset is calculated, and a proper offset method is selected for carrying out the magnetic pole deviation. The performances of the reluctance torque and the cogging torque are reduced.According to the invention, the equivalent magnetic circuit method is used for analyzing and calculating an optimal extreme arc coefficient. Not only the optimal permanent magnet torque performance isobtained, but also the design period is shortened. By adopting the magnetic pole offset method, the pulsation of the output torque of the embedded motor is further reduced.

Description

technical field [0001] The invention relates to the design of a permanent magnet synchronous motor, in particular to a method for reducing the torque ripple of the permanent magnet synchronous motor, and belongs to the technical field of motor manufacturing. Background technique [0002] Because of the advantages of high torque density, high efficiency and wide speed range, embedded permanent magnet motors have been widely used in the fields of electric vehicles, aerospace and ship drives. With the wide application of embedded permanent magnet motors in many high-performance industrial fields, high requirements are put forward for the working stability of the motors, that is, the output torque ripple of the motors should be as small as possible, so as to achieve stable and accurate Thrust transmission, so research on reducing torque ripple is very valuable. [0003] At present, there are relatively in-depth researches at home and abroad on the suppression of torque ripple, ...

AI Technical Summary

Problems solved by technology

On this basis, the analysis limited to the cogging torque is far from enough

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