不同充磁方式的对转永磁电机气隙磁场性能研究  

Research of Air- gap Magnetic Field in Contra-rotating PM Motor with Different Magnetization Manners

作　　者：李延升[1,2] 窦满峰[2] 骆光照[2] 

机构地区：[1]国网陕西省电力公司检修公司,陕西西安710065 [2]西北工业大学自动化学院,陕西西安710129

出　　处：《四川大学学报（工程科学版）》2014年第1期140-146,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51177135);陕西省自然科学基金重点项目资助(2011GZ013)

摘　　要：针对磁钢不同充磁方式对电机磁场性能影响不同,在对比分析径向充磁、平行充磁和Halbach磁体磁化强度分布的基础上,提出一种计算内永磁体转子和外永磁体转子对转电机气隙磁密的解析算法。该算法计算结果与有限元分析结果接近且趋势相同,是一种在电机设计前期预报气隙磁场分布的有效方法。利用解析和有限元相结合的方法研究了充磁方式对2种转子结构对转永磁电机气隙磁场的影响。结果表明:外永磁体转子对转电机选择径向充磁能获得趋近方波的气隙磁密和较高的磁密峰值,适合无刷直流电机;内永磁体转子对转电机选择平行充磁既可提高气隙磁密的正弦分布程度,又能得到较高气隙峰值;Halbach磁体的电机气隙磁密正弦分布程度高,谐波含量小,适用于永磁同步电机。Based on the effects of magnetization of permanent magnet（PM） on the magnetic field distribution, an analytical method was presented to solve the slotted air-gap of a surface PM contra-rotating motor（CRM） with three common types of magnetization field pat- terns, Radial, Parallel and Halbach magnetization. This analytical method is very effective for forecasting the magnetic field distribu- tion and in agreement with the results of finite-element simulations. According to the analysis of the differences between the fields of the machine with different magnetizations, the accurate 2D finite-element analysis model was established in both internal and external rotor CRM. The testing and simulation results showed that the external rotor CRM with radial magnetization has a greater flux density and trapezoidal wave which is suitable for brnshless DC motor, and the internal rotor CRM with parallel magnetization can improve the sinu- soidal waveform distribution and has a greater flux density. The air-gap flux density of Halbach magnet motor has the most sinusoidal waveform distribution which demonstrates that Halbach magnet is suitable for multi-polar PM motor.

关 键 词：径向充磁 平行充磁 HALBACH磁体 对转永磁电机 气隙磁密 

分 类 号：TM351[电气工程—电机]