磁极不等厚对兆瓦级永磁直驱风力发电机的影响  

Influence of Unequal Thickness Poles on MW-level Direct-driven Permanent Magnetic Wind Turbine

作　　者：李伟力[1] 袁世鹏[1] 霍菲阳[2] 张奕黄[2] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150040 [2]北京交通大学电气工程学院,北京100044

出　　处：《大电机技术》2011年第4期30-34,38,共6页Large Electric Machine and Hydraulic Turbine

基　　金：哈尔滨市科技攻关计划项目(2009AA4AG054);黑龙江省科技攻关计划项目(GA09A301);黑龙江省研究生创新基金项目(YJSCX2009-031HLJ)

摘　　要：为了研究不等厚磁极结构对兆瓦级直驱式永磁同步风力发电机影响,首先计算了电机的齿槽转矩,并建立瞬态电磁场模型,利用时步有限元法对发电机的电磁场和输出特性进行了计算。在此基础上,分析了磁极偏心距的变化对电机齿槽转矩、空载气隙磁场分布以及在负载情况下对输出特性的影响。结果表明,采用不等厚磁极可以影响发电机的齿槽转矩,优化气隙磁密波形,但同时使电机极间漏磁增加,负载时输出电压和功率降低。To research the influences on megawatt-scale directly-driven Permanent Magnet Synchronous Generator for wind turbine by the structure of unequal thickness magnetic poles,the cogging-torque was calculated and a model of transient electromagnetic field was established.The electromagnetic field and the output performance of generator were simulated and calculated by time-stepping finite element method.Further more,the effects of the eccentricity of poles on cogging torque,distribution of air-gap magnetic field at no-load and output performance at load were analyzed.The results showed that the cogging torque of PMSG can be influence and the waveform of no-load air-gap flux density can be optimized.However,unequal thickness poles can increase leak-flux,decrease output voltage and power.

关 键 词：同步发电机 有限元 电磁场 不等厚磁极 齿槽转矩 

分 类 号：TM315[电气工程—电机]