Method for weakening and analyzing cogging torque of surface-mounted permanent magnet motor
A cogging torque and permanent magnet motor technology, applied in design optimization/simulation, geometric CAD, etc., can solve problems such as complex cogging torque sources and analysis methods, weakening cogging torque, etc.
Pending Publication Date: 2020-02-04
JIANGSU UNIV
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[0005] In view of the above problems, the present invention proposes a method for weakening the cogging torque and in order to solve the problem that the finite element method cannot analyze the source of the cogging torque and the analytical method is too complicated, a combination of the finite element method and the analytical method is proposed method to analyze the effect of changing the pole shape on the cogging torque
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[0038] Hereinafter, the present invention will be further described in conjunction with the drawings and specific embodiments.
[0039] The present invention adopts the method of magnetic pole eccentricity to weaken the cogging torque, and provides a method for analyzing the influence of magnetic pole shape change on the cogging torque at the same time, and adopts a method combining finite element and analytical method to analyze the magnetic pole shape. Change the effect on cogging torque.
[0040] figure 1 A flowchart of a method for analyzing the origin of cogging torque of surface-mounted permanent magnet motors with different pole shapes is provided, including:
[0041] Step 1. Using the method of magnetic pole eccentricity, the cogging torque is minimized by optimizing the eccentricity;
[0042] The air gap flux density of surface mount permanent magnet motor can be expressed as:
[0043]
[0044] where μ 0 is the air permeability, H c is the coercive force of th...
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The invention discloses a method for weakening and analyzing cogging torque of a surface-mounted permanent magnet motor. The method belongs to the technical field of permanent magnet synchronous motors, and comprises the following steps: firstly, reducing cogging torque by adopting a magnetic pole eccentricity method, optimizing a magnetic pole eccentricity distance, and selecting an optimal eccentricity distance to minimize the cogging torque. A; according to the method, the cogging torque is weakened by changing the shape of a magnetic pole, and in order to further research the influence ofthe change of the shape of the magnetic pole on the cogging torque, radial air gap flux density and tangential air gap flux density components are obtained through Maxwell software simulation according to a Maxwell tensor method and substituted into the cogging torque. And finally, calculating the contribution of each-order air gap flux density harmonic wave to the cogging torque is calculated atany moment of an electric period by utilizing a method of combining a finite element and analysis. According to the method, the change of the cogging torque under different magnetic pole shapes is analyzed through the cogging torque waveform under each order.
Description
technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to a method for weakening cogging torque and analyzing cogging torque. [0002] technical background [0003] Surface-mounted permanent magnet synchronous motors have the advantages of small size, light weight, simple structure, reliable operation, and high torque density, and are widely used in ships, aviation, public life and other fields. But cogging torque is generated due to the interaction between permanent magnets and stator slots, which has a great influence on the torque ripple of the motor, thereby affecting the overall performance of the motor. [0004] Scholars have studied many methods to weaken the cogging torque. The chute is widely used to reduce the cogging torque, but it is not easy to process and the production cost is high. In order to avoid this shortcoming, eccentric teeth are used instead of the chute. The cogging torque can also be...
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IPC IPC(8): G06F30/17G06F30/23
Inventor 赵文祥周敏胡敬宁
Owner JIANGSU UNIV