Method and device for reducing cogging torque of permanent magnet motor

Abstract

The invention discloses a method and device for reducing cogging torque of a permanent magnet motor. The method comprises the following steps: acquiring a magnetic field pair which affects the amplitude of the cogging torque based on a generation mechanism of the cogging torque; calculating the contribution value of the magnetic conductance of each position of the permanent magnet motor in the circumferential direction to average torque under the condition of an existing structure based on magnetic conductance harmonic waves which generate a working magnetic field, and acquiring an average torque distribution curve distributed in the circumferential direction; and comprehensively taking a cogging torque amplitude and the average torque distribution curve which are generated by target magnetic conductance harmonic waves influencing the cogging torque into consideration so as to obtain a region which has a large influence on the cogging torque but has a small influence on the average torque and serves as a target optimization region, and conducting size parameter optimization on a stator core structure in the target optimization region. Therefore, the cogging torque of the permanent magnet motor is effectively reduced on the premise that the influence on the output torque of the permanent magnet motor is small.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and more specifically relates to a method and device for reducing cogging torque of permanent magnet motors. Background technique [0002] As an extensive and key basic component, the motor plays a key role in improving the overall level of the equipment manufacturing industry. At the same time, the rapid development of the manufacturing industry also puts forward higher requirements for the performance and quality of the motor such as torque density, response speed, and torque ripple. Among them, torque ripple is an important factor affecting the torque quality of the motor and the control accuracy of the private server system. In addition, it will also cause motor vibration and mechanical noise, and even affect the reliability of the motor in serious cases. The servo neighborhood has extremely high requirements on the stability of the motor output torque. The cogging torque of ...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method and device for reducing the cogging torque of a permanent magnet motor, thereby solving the problem that the existing method for reducing the cogging torque will reduce the average torque and reduce the slot fullness. rate technical issues

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