A method of suppressing cogging torque of permanent magnet synchronous motor by using non-uniform stator slots

A permanent magnet synchronous motor, cogging torque technology, applied in the direction of magnetic circuit static parts, magnetic circuit shape/style/structure, etc., can solve the problem of weakening mechanical strength of stator teeth, difficult processing and manufacturing, and unsuitable motors. and other problems, to achieve the effect of improving the back EMF waveform, avoiding the phenomenon of asymmetric lines, and improving the overall performance

Inactive Publication Date: 2017-09-29
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pole-slot matching method is limited by the number of poles and slots of the motor; the optimization of the rotor magnetic poles is often difficult to manufacture and the cost is high; and the use of auxiliary slots often weakens the mechanical strength of the stator teeth and easily leads to saturation of the iron core
At present, the chute is a more commonly used method, but it is not suitable for motors with shorter axial lengths

Method used

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  • A method of suppressing cogging torque of permanent magnet synchronous motor by using non-uniform stator slots
  • A method of suppressing cogging torque of permanent magnet synchronous motor by using non-uniform stator slots
  • A method of suppressing cogging torque of permanent magnet synchronous motor by using non-uniform stator slots

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0046] The method of using non-uniform stator slots to suppress the cogging torque of permanent magnet synchronous motors, under the condition that the size of the stator slots remain unchanged, the center position of the stator slots rotates and shifts in the circumferential direction of the stator,

[0047] The formula for the offset angle is,

[0048]

[0049] in,

[0050] Δα i is the offset angle of the i-th stator slot located in the j-th unit motor;

[0051]

[0052] i=1, 2, 3, ..., Q, and i is an integer;

[0053] Q is the number of stator slots;

[0054] j=1, 2, 3, ..., Z, and j is an integer;

[0055] Z is the number of unit motors included in the entire permanent magnet syn...

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Abstract

The invention discloses a method for suppressing cogging torque of a permanent magnet synchronous motor by using non-uniform stator slots. Under the condition that the size of the stator slot remains unchanged, the center position of the stator slot rotates and deviates in the circumferential direction of the stator. The method proposed by the present invention utilizes the non-uniform stator slot distribution structure to weaken the cogging torque of the permanent magnet synchronous motor. Independent design; and this method can not only reduce the cogging torque of the permanent magnet synchronous motor, but also improve the waveform of the back electromotive force of the motor, reduce the fluctuation of the electromagnetic torque, and avoid the asymmetry of the three-phase winding caused by the non-uniform slot distribution phenomenon, which can effectively improve the overall performance of the motor.

Description

technical field [0001] The invention relates to a method for suppressing the cogging torque of a permanent magnet synchronous motor by using non-uniform stator slots, and belongs to the field of permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motor has high efficiency, power factor and torque density, so it is widely used in various fields of industrial production and daily life. However, for permanent magnet synchronous motors, especially low-speed direct-drive permanent magnet synchronous motors, the existence of cogging torque will cause vibration and noise of the motor, which seriously affects the system control accuracy and torque stability, so it has become a key problem in motor design and control. one. [0003] Through the research on the generation mechanism of cogging torque, people have proposed a variety of methods to weaken the cogging torque of permanent magnet motors, such as optimizing the pole-slot fit, changi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/16
Inventor 陈浈斐马宏忠
Owner HOHAI UNIV
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