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Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field

A shielding, permanent magnet motor technology, applied in the shape/pattern/structure of the magnetic circuit, shielding the electromagnetic field, rotating parts of the magnetic circuit, etc., can solve the problems such as the inability to effectively suppress the eddy current at the rotor end, the overheating of the rotor end, and the demagnetization. , to achieve the effect of suppressing eddy current loss, reducing eddy current loss, and high conductivity

Pending Publication Date: 2019-10-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the traditional rotor structure with shielding layer cannot effectively suppress the eddy current at the end of the rotor, and it is easy to cause local overheating and demagnetization at the end of the rotor

Method used

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  • Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field
  • Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field
  • Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field

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Embodiment Construction

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.

[0031] Such as figure 1 As shown, the rotor structure of the existing common surface-mounted permanent magnet motor includes the rotating shaft 1, the rotor core 2, the permanent magnet 3, the shielding layer 4 and the rotor sheath 5 from the inside to the outside.

[0032] In the embodiment of the present invention, the rotor structure of the surface-mounted permanent magnet motor with a conductive end cover is as follows: figure 2 and image 3 As shown, including the rotating shaft 1, the surface of the rotating shaft 1 is sequentially wrapped with the rotor core 2, the permanent magnet 3, the shielding layer 4 and the rotor sheath 5 from the inside to the outside; The end cap 6 is fixedly ...

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Abstract

The invention discloses a permanent magnet motor rotor structure for enhancing the shielding effect of a harmonic magnetic field, which comprises a rotating shaft and is characterized in that the surface of the rotating shaft is sequentially wrapped with a rotor core, a permanent magnet, a shielding layer and a rotor sheath from inside to outside; and the two axial ends of the permanent magnet areprovided with conductive end covers, and the conductive end covers are fixedly connected with the shielding layer and are tightly attached to the permanent magnet. The structure can effectively reduce the eddy current loss in the permanent magnet and the eddy current loss in the shielding layer, reduce the total eddy current loss of the rotor and improve the operation reliability of the permanentmagnet motor.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a rotor structure of a permanent magnet motor which enhances the shielding effect of a harmonic magnetic field. Background technique [0002] Motors are an important part of industrial systems, and motors with excellent performance are crucial to industrial systems. With the development of power electronics technology, more and more motors are powered by inverters. Since the switching frequency of the inverter is limited by power electronic devices, when the motor speed increases and the frequency of the current fundamental wave increases, the time harmonics of the stator current will increase significantly. The magnetic field generated by the time harmonics of the stator current rotates asynchronously with respect to the rotor, which will cause the magnetic field fluctuation in the rotor, causing eddy current and heat loss in the rotor. This phenomenon is especially ...

Claims

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Application Information

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IPC IPC(8): H02K1/27H02K11/01H02K3/42
CPCH02K1/2733H02K11/01H02K3/42
Inventor 沈建新秦雪飞王云冲
Owner ZHEJIANG UNIV
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