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Method for selecting the number of rotor teeth of permanent magnet synchronous motor with low cogging torque asynchronous start

A technology of cogging torque and permanent magnet synchronization, applied in synchronous machines, magnetic circuit rotating parts, electromechanical devices, etc., can solve problems such as reducing cogging torque, reduce vibration and noise, and reduce cogging torque. Effect

Inactive Publication Date: 2017-06-06
SHANDONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in terms of reducing the cogging torque, there is no method to follow for the selection of the number of rotor teeth of the asynchronous starter permanent magnet synchronous motor.

Method used

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  • Method for selecting the number of rotor teeth of permanent magnet synchronous motor with low cogging torque asynchronous start
  • Method for selecting the number of rotor teeth of permanent magnet synchronous motor with low cogging torque asynchronous start
  • Method for selecting the number of rotor teeth of permanent magnet synchronous motor with low cogging torque asynchronous start

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as Figure 1-Figure 3 As shown, a method for selecting the number of rotor teeth of a low cogging torque asynchronous start permanent magnet synchronous motor, there is a certain interval (1) between two adjacent permanent magnet poles on the rotor side of the motor, and all intervals (1) are equal .

[0028] According to the number of stator teeth Q of the asynchronous starting permanent magnet synchronous motor 1 , the number of pole pairs p, choose the appropriate number of rotor teeth, so that N q2 / q 2 and N q2 Maximum and priority to make N q2 / q 2 maximum, a smaller cogging torque can be obtained, where

[0029]

[0030]

[0031] in, express and q 2 least common multiple of ; GCD(Q 1 ,2p) means Q 1 and the greatest common divisor of 2p; Q 1 is the number of stator teeth; p is the number of pole pairs of the motor;...

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Abstract

The invention discloses a rotor tooth number selection method for a low-cogging-torque asynchronous-starting permanent-magnet synchronous motor. According to the method, aiming at problems of an asynchronous-starting permanent-magnet synchronous motor that the operation of a motor is instable, and vibration and noise can be produced, wherein the asynchronous-starting permanent-magnet synchronous motor comprises a stator and a rotor, permanent magnets are arranged in the stator and a rotor, a certain interval is formed between the two adjacent permanent magnets, and all the intervals are equal, calculation models of a main harmonic order which generates a cogging torque in square distribution of a magnetomotive force of an air gap and is inflected by tooth sockets of the rotor and a rotor tooth harmonic order corresponding to the main harmonic order are constructed, and a relatively small cogging torque can be obtained by selecting the rotor tooth number according to actual stator tooth number and motor pole number of the asynchronous-starting permanent-magnet synchronous motor by virtue of the maximal main harmonic order and rotor tooth harmonic order, preferably the maximal rotor tooth harmonic order, so that the stable operation of the motor is benefited.

Description

technical field [0001] The invention relates to a method for selecting the number of rotor teeth of a low cogging torque asynchronous start permanent magnet synchronous motor. Background technique [0002] The cogging torque of the permanent magnet motor is the torque generated by the interaction between the permanent magnetic field and the slotted core when the winding is not energized, which will have an adverse effect on the stable operation of the motor and may generate vibration and noise. For permanent magnet motors with unilateral grooves on the stator and rotor of the surface type and ordinary built-in type, the measures to weaken the cogging torque can be divided into four categories: changing the coordination between the number of teeth of the armature and the number of poles of the motor, changing the parameters of the armature, changing the Permanent magnet rotor parameters to counteract the effects of cogging torque through the motor control method. [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27H02K21/46
Inventor 王秀和唐旭
Owner SHANDONG UNIV