磁动势法五相永磁力矩电机转矩分析  

Torque Analysis of Five-phase Permanent Magnet Torque Motors Based on Magnetic Motive Force

作　　者：彭兵[1] 王成元[1] 夏加宽[1] 孙宜标[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁省沈阳市110870

出　　处：《中国电机工程学报》2012年第21期105-111,共7页Proceedings of the CSEE

基　　金：辽宁省科技厅重点项目(2010220038);辽宁省科技攻关项目(2010020075-301);辽宁省自然科学基金项目(201133029)~~

摘　　要：五相永磁力矩电机由于极数与槽数相近,含有丰富的磁动势谐波,磁动势谐波会影响电机的转矩性能。为此,采用磁动势法分析电机的电磁转矩,通过磁能和虚位移原理推导出了电机电磁转矩的解析表达式,揭示了具有相同空间次数的定子和转子磁动势谐波相互作用才能产生电磁转矩的规律。通过对五相永磁力矩电机的定、转子磁动势谐波与电磁转矩关系的分析,指出与与主波转速一致的定子和转子磁动势谐波相互作用能提高五相永磁力矩电机的平均电磁转矩。利用Ansoft有限元软件仿真分析了电机在正弦波、梯形波和方波供电下的定子磁动势、转子磁动势以及转矩性能。结果表明,非正弦供电能够增加电机的电磁转矩,但也带来了转矩脉动,验证了磁动势法分析五相永磁力矩电机转矩的有效性和正确性。Because of the pole number being close to the slot number, the five-phase permanent magnet torque motor has abundant harmonic components of magnetic motive force （MMF）, which influences the torque performance of the motor. Therefore, the electromagnetic torque of the motor is analyzed by using the MMF method. The analytical expression of the motor electromagnetic torque is derived from the magnetic energy and the virtual displacement principle, and it reveals the rule that the torque is generated only when the MMF of the stator and the rotor have the same space harmonic order. The analysis of the relationship between stator and rotor MMFs and electromagnetic torque in the five-phase permanent magnet torque motors shows that the average electromagnetic torque of the motor could be enhanced under the reaction of the stator and rotor MMFs, when the speed of stator and rotor MMFs is equal to the speed of main wave. The MMF harmonic components of the stator and rotor and the performance of the torque are analyzed by using the Ansoft finite element software, when the motor is energized by the sinusoidal, trapezoidal and rectangular current separately. The simulation results demonstrate that the electromagnetic torque of the motor is enhanced along with the torque ripple when the motor is energized by non-sinusoidal currents, and prove that this method is effective and correct.

关 键 词：磁动势 五相永磁力矩电机 近极槽数配合 虚位移原理 非正弦供电 

分 类 号：TM351[电气工程—电机]