Method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage

A technology of polar arc coefficient and shaft voltage, which is applied in the field of combined generation method and system of different pole arc coefficients of magnetic poles, can solve bearing damage, and there are few researches on the weakening measures of inherent shaft voltage of built-in permanent magnet synchronous motor, and the generation of loop axis Current and other problems, to achieve the effect of improving reliability, weakening effect, and simple method

Active Publication Date: 2021-07-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the natural shaft voltage amplitude is higher than the breakdown threshold of the bearing oil film, a loop shaft current will be generated, causing damage to the bearing in a short time
[0005] The inventors found that for the shaft voltage problem of the interior permanent magnet synchronous motor, most of the research focuses on the suppression of the bearing voltage, and there are few researches on the weakening measures of the intrinsic shaft voltage of the interior permanent magnet synchronous motor

Method used

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  • Method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage
  • Method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage
  • Method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage

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Embodiment 1

[0040] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a method for generating a combination of magnetic poles with different polar arc coefficients that weakens the natural shaft voltage, including the following process:

[0041] Obtain the pole-slot matching data of the built-in permanent magnet synchronous motor;

[0042] According to the distribution of the magnetomotive force along the air gap circumference under the combination of different pole arc coefficients, the Fourier expansion of the magnetomotive force is obtained;

[0043] According to the obtained pole-slot matching data and the Fourier expansion of the magnetomotive force, the Fourier decomposition coefficient of the magnetomotive force related to the fundamental wave of the intrinsic shaft voltage is obtained;

[0044] Aiming at zero value of the Fourier decomposition coefficient of magnetomotive force, a combination of polar arc coefficients that can weaken the intrinsic shaft vo...

Embodiment 2

[0071] Embodiment 2 of the present disclosure provides a system for generating a combination of different pole arc coefficients of magnetic poles that weakens the natural shaft voltage.

[0072] A combined generation system of different polar arc coefficients of magnetic poles that weakens the natural shaft voltage, including:

[0073] The data acquisition module is configured to: acquire the pole-slot matching data of the built-in permanent magnet synchronous motor;

[0074] The magnetomotive force Fourier expansion module is configured to obtain the Fourier expansion of the magnetomotive force according to the distribution of the magnetomotive force along the air gap circumference under the combination of different pole arc coefficients of the magnetic poles;

[0075] The magnetomotive force Fourier decomposition coefficient acquisition module is configured to: obtain the magnetomotive force Fourier decomposition coefficient related to the fundamental wave of the intrinsic s...

Embodiment 3

[0079] Embodiment 3 of the present disclosure provides a computer-readable storage medium, on which a program is stored. When the program is executed by a processor, the combined generation of magnetic poles with different polar arc coefficients that weaken the natural shaft voltage as described in Embodiment 1 of the present disclosure is provided. steps in the method.

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Abstract

The invention provides a method and system for generating combination of different pole-arc coefficients of magnetic poles for weakening inherent shaft voltage. The method comprises the following steps: acquiring pole slot matching data of a built-in permanent magnet synchronous motor; obtaining a Fourier expansion of the magnetomotive force according to the distribution of the magnetomotive force along the circumference of the air gap under different pole arc coefficient combinations of the magnetic poles; obtaining a magnetomotive force Fourier decomposition coefficient related to a natural axis voltage fundamental wave according to the obtained pole slot matching data and a magnetomotive force Fourier expansion; and taking the Fourier decomposition coefficient value of the magnetomotive force as zero as a target to obtain a pole-arc coefficient combination capable of weakening the intrinsic axis voltage. The method and system are applied to the built-in permanent magnet synchronous motor, the inherent shaft voltage of the built-in permanent magnet synchronous motor is weakened, and the operation reliability of a motor system is improved.

Description

technical field [0001] The disclosure relates to the technical field of built-in permanent magnet synchronous motors, and particularly designs a method and system for generating combinations of different pole arc coefficients of magnetic poles that weaken the inherent shaft voltage. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Due to the advantages of high power density, high efficiency, and strong field-weakening speed expansion capability, built-in permanent magnet synchronous motors are widely used in wind power generation, aerospace, rail transit and other applications. In these applications, the built-in permanent magnet synchronous motor must have high reliability and high stability for long-term operation. [0004] The inherent shaft voltage is generated by the unbalanced magnetic circuit caused by the pole-slot coordination o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06G06F17/14
CPCG06Q50/06G06F17/141
Inventor 王秀和赵方伟孙玲玲
Owner SHANDONG UNIV
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