基于不等齿靴的双谐波永磁电机优化设计

Optimum Design of Bi-harmonic PMSM Based on Unequal Arc of Tooth Shoe

五相永磁同步电机可利用双谐波(基波和三次谐波)电流输出转矩,因此需同时考虑基波和三次谐波绕组因数及磁动势谐波含量;分数槽集中绕组的绕组因数小于1,且磁动势谐波含量丰富;针对该问题,提出采用电枢齿与辅助齿齿靴弧度不等的五相双谐波电机,根据解析推导出不等齿靴对双谐波电机绕组因数和磁动势谐波分布影响的数学模型。建立等齿靴与不等齿靴有限元模型对比仿真,验证了不等齿靴的双谐波永磁同步电机比等齿靴有更高的空载反电动势基波、三次谐波含量和更低的七次、九次谐波含量;在相同电流密度下,基于不等弧度齿靴的双谐波电机输出转矩性能更好。

Five-phase PMSM can utilize the fundamental and third harmonic winding current to output torque at the same time,so it is necessary to pay attention to the fundamental and third harmonic winding factors and the harmonic of magnetomotive force(MMF);the winding factor of the fractional slot concentrated winding,which contains abundant content of MMF harmonic,is less than 1;for above issues,an unequal arc of tooth shoe model to optimize the five-phase dual harmonic motor was proposed.The influence of the unequal tooth shoe arc to the harmonic distribution of the winding factor and MMF of the bi-harmonic motor was calculated.And a comparative simulation of the finite element model was established to verify that dual harmonic motors with unequal tooth shoe arc have higher no-load back-EMF 1st and 3rd harmonic content,and lower 7th and 9th harmonic content;Under the same current density,bi-harmonic PMSM with unequal tooth shoe arc has a higher output torque.