Design method of permanent magnet motor capable of reducing cogging effect and permanent magnet motor

Abstract

The invention discloses a design method of a permanent magnet motor capable of reducing cogging effect and a permanent magnet motor. Each magnetic pole in the permanent magnet motor at least comprises two permanent magnets with the same magnetic pole directions, and corresponding parameters of permanent magnets subjected to circular arc top surface or chamfering treatment when the cogging effect of the permanent magnet motor is the minimum are acquired by a finite element computation method, wherein the parameters of the permanent magnets mainly comprise the number n (n>=2) of the permanent magnets the magnetic pole directions of which are the same in each magnetic pole, the width of each permanent magnet, and the distance between two adjacent permanent magnets. The permanent magnet motor disclosed by the invention can reduce cogging torque / cogging force peak value borne by a single tooth and reduce complicated harmonic components, thereby effectively reducing the cogging torque / cogging force of a surface type permanent magnet motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for reducing the cogging effect of a permanent magnet motor and the permanent magnet motor. Background technique [0002] Due to its compact structure, high torque density, high efficiency, non-excitation heating, etc., permanent magnet motors have been more and more widely used in industry. [0003] In the permanent magnet motor, the pole pairs of permanent magnets are arranged alternately according to N and S poles. For permanent magnet linear motors, see figure 1 , permanent magnet rotating motor see figure 2 . see Figure 7 , when a single tooth of the permanent magnet motor is close to the two ends of the permanent magnet, the amplitude of the cogging torque / cogging force is the largest. When the center line of the tooth coincides with the permanent magnet, the cogging torque / tooth The cogging force is zero. In the prior art, due to the fixed circumferential bro...

AI Technical Summary

Problems solved by technology

[0005] The skewed slot or skewed pole structure is a widely used method of reducing cogging, by tilting the stator laminations or the mover magnets at a certain angle, ideally, the cogging torque / cogging force will be at the tilted stator slot pitch The disadvantage of this solution is that the torque constant / thrust constant of the permanent magnet motor will decrease

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