铜屏蔽层对高速永磁无刷直流电机转子涡流损耗和应力的影响分析  

Influences of Copper Shield on Eddy-current Loss and Stress for a Rotor of High-speed PM BLDC Motor

作　　者：张忠明 邓智泉[1] 孙权贵 许治宇 李克翔[1] ZHANG Zhongming;DENG Zhiquan;SUN Quangui;XU Zhiyu;LI Kexiang(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, Jiangsu Province, China)

机构地区：[1]南京航空航天大学自动化学院

出　　处：《中国电机工程学报》2018年第8期2476-2486,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51577087)~~

摘　　要：在永磁体和保护套之间增加高导电铜屏蔽层,能够降低非同步旋转的时间和空间谐波在高速永磁无刷直流电机转子中产生的涡流损耗。首先验证不同厚度的铜屏蔽层对降低转子涡流损耗的效果,建立包含铜屏蔽层在内的多层环形结构的转子应力计算流程,并提出一种计算铜屏蔽层内外接触面预置过盈量的方法,计算过程均考虑到预置过盈量、旋转离心力以及温升对应力的影响。在此基础上,分析铜屏蔽层厚度对转子各层部件最大应力的影响。通过有限元仿真以及样机测试,验证了分析方法的有效性。Attaching high conductive copper layer between the sleeve and permanent magnets can reduce the eddy-current loss caused by asynchronous time and space field harmonics in the rotor of high-speed permanent magnet brushless direct-current（PM BLDC） motors. In this paper, the effect of copper shields with different thicknesses on reducing rotor eddy-current loss was verified, and then the stress calculation procedure for the rotor with multi-layer rings including copper shield were established. A method for calculating the presetting interference fittings of the interfaces was proposed. All the calculations take into account the influences of presetting interference fittings, centrifugal force and temperature rise. On this basis, the influences of copper shield thickness on the maximum stress of each part of the rotor were analyzed. The validity of the analytical method was verified by simulation using finite element method and prototype test.

关 键 词：铜屏蔽层 高速电机 永磁无刷直流电机 转子应力 转子涡流损耗 温升 过盈 

分 类 号：TM336[电气工程—电机]