高速永磁同步电机结构对转子涡流损耗影响

摘要/Abstract

摘要： 转子涡流损耗及其引起的转子温升是高速永磁电机设计中急需解决的关键问题。研究了高速永磁同步电机结构(包括极槽配合、槽口宽和转子护套的材料、厚度以及轴向分段数)对转子涡流损耗的影响。介绍了三维有限元计算转子涡流损耗的基本理论,从气隙磁场及其空间谐波的角度,对比分析负载电流和定子槽口宽对2极12槽和2极18槽高速永磁同步电机转子涡流损耗的影响,得出2极18槽高速永磁同步电机更有利于减小转子涡流损耗;计算并分析不同的转子护套材料、厚度和轴向分段数对转子涡流损耗的影响,减小转子护套厚度和增加护套轴向分段数可有效地减少转子涡流损耗,钛合金Tc4有利于减小涡流损耗并有效保护高速旋转的永磁体。

关键词: 高速永磁同步电机, 涡流损耗, 转子护套, 结构

Abstract: The eddy current loss and temperature rising of rotor are the key issues which need to be solved urgently in the design of high-speed permanent magnet motor(HSPMSM). The influence of the structure of HSPMSM on eddy current loss of rotor was studied, such as the number of poles and slots, width of slot opening and material, thickness and number of axial segments of rotor sleeve. The basic theory of 3D finite element to calculate eddy current loss of rotor was introduced. The influence of the loading current and the width of stator slot-opening on the eddy current loss of rotor were analyzed by comparing two HSPMSMs with 2-pole 12-slot and 2-pole 18-slot from the perspective of air-gap flux density and its space harmonics. It was concluded that HSPMSM with 2-poles 18-slots was more effective to reduce eddy current loss of rotor than that with 2-pole 12-slot. The eddy current loss of rotor was calculated and analyzed in the HSPMSM with different materials, thickness of rotor sleeve and number of axial segments. It was effective to reduce eddy current loss of rotor by reducing the thickness of rotor sleeve and increasing the number of axial segments of rotor sleeve. Tc4 was beneficial to reduce eddy current loss of rotor and effectively protect permanent magnet with high rotational speed.

Key words: high-speed permanent magnet synchronous motor(HSPMSM), eddy-current loss, rotor sleeve, structure

中图分类号:

TM351
TM355

刘柯, 周羽, 杨小宝, 罗波. 高速永磁同步电机结构对转子涡流损耗影响[J]. 微特电机, 2022, 50(12): 16-20.

LIU Ke, ZHOU Yu, YANG Xiaobao, LUO Bo. Influence of the Structure of High-Speed Permanent Magnet Synchronous Motor on Eddy Current Loss of Rotor[J]. Small & Special Electrical Machines, 2022, 50(12): 16-20.

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