A non-uniform air gap structure to weaken the inherent shaft voltage of built-in permanent magnet motors

A uniform air gap, permanent magnet motor technology, applied in electrical components, magnetic circuits, electromechanical devices, etc., can solve the problems of generating loop shaft current, bearing damage, and weakening of the shaft voltage of the built-in permanent magnet synchronous motor, to ensure Mechanical strength, convenient processing technology, the effect of weakening the inherent shaft voltage

Active Publication Date: 2022-07-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 inventor found that for the shaft voltage weakening measures of the built-in permanent magnet synchronous motor, there are few studies on suppressing the inherent shaft voltage from the perspective of motor electromagnetic design

Method used

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  • A non-uniform air gap structure to weaken the inherent shaft voltage of built-in permanent magnet motors
  • A non-uniform air gap structure to weaken the inherent shaft voltage of built-in permanent magnet motors
  • A non-uniform air gap structure to weaken the inherent shaft voltage of built-in permanent magnet motors

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Embodiment 1

[0029] Embodiment 1 of the present disclosure provides a rotor non-uniform air gap structure that weakens the inherent shaft voltage of a built-in permanent magnet synchronous motor. Taking the built-in permanent magnet synchronous motor with a V-shaped rotor magnetic circuit structure as an example, the rotor non-uniform air gap structure like figure 1 shown.

[0030] In the figure, R 1 is the radius of the rotating shaft, R 2 is the inner diameter of the stator, δ 1 is the minimum air gap length, δ 2 is the maximum air gap length, arc 1 , arc 2 , arc 3 is an arc, l 1 , l 2 is line segment, arc arc 1 , arc 3 The corresponding center of the circle is O, that is, the center of the rotor circle of the uniform air gap structure, the arc arc 2 The corresponding center is O', d is the eccentricity, and α is the center angle corresponding to the permanent magnet slot.

[0031] The specific working principle is:

[0032] The size of the inherent shaft voltage of the buil...

Embodiment 2

[0044] Embodiment 2 of the present disclosure provides a built-in permanent magnet synchronous motor, including the non-uniform air gap structure for weakening the inherent shaft voltage of the built-in permanent magnet motor described in Embodiment 1 of the present disclosure.

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Abstract

The present disclosure provides an uneven air gap structure for weakening the inherent shaft voltage of a built-in permanent magnet motor, which is applied to a built-in permanent magnet synchronous motor, comprising: a rotor body, the rotor body includes a plurality of magnetic poles; The surface includes three arc structures in sequence, the first arc structure and the third arc structure correspond to the first circle center, the second arc structure is located between the first arc structure and the third arc structure, and the second arc structure is located between the first arc structure and the third arc structure. Corresponding to the second circle center, the second circular arc structure is embedded with a preset distance relative to the first circular arc structure and the third circular arc structure; the present disclosure can effectively weaken the inherent shaft voltage of the built-in permanent magnet synchronous motor, and improve the reliability of the motor operation. sex and stability.

Description

technical field [0001] The present disclosure relates to the technical field of built-in permanent magnet synchronous motors, in particular to a rotor non-uniform air gap structure for weakening the inherent shaft voltage of the built-in permanent magnet motor. Background technique [0002] The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] Due to the advantages of high power density, high efficiency, and strong weak magnetic speed expansion capability, built-in permanent magnet synchronous motors are widely used in electric vehicles, medical equipment, rail transit and other applications. Therefore, the built-in permanent magnet synchronous motor must have high reliability. [0004] The inherent shaft voltage is generated by the unbalance of the magnetic circuit caused by the matching of the poles and grooves of the built-in permanent magnet synchronous motor. When the amplitude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/276
CPCH02K1/2766H02K2213/03
Inventor 王秀和赵方伟孙玲玲
Owner SHANDONG UNIV
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