永磁游标电动机双绕组低谐波设计与磁热性能比较

Dual-winding low-harmonic design and electromagnetic thermal performance comparison of permanent magnet vernier motor

为削弱永磁游标电动机的电枢反应磁场中的无效谐波含量,实现电动机高效运行,基于磁场调制理论提出一种双绕组低谐波永磁游标电动机.首先,阐明谐波抵消原理;其次考虑到温升对导线和永磁体性能的影响,利用有限元法对传统永磁游标电动机和双绕组低谐波永磁游标电动机的电磁场和温度场进行双向耦合计算,并对气隙磁密、转矩和温升等性能参数进行对比.研究结果表明:得益于低谐波设计,双绕组低谐波永磁游标电动机的转矩和效率得到改善,相比传统永磁游标电动机,在常温20℃时,所提出的双绕组低谐波永磁游标电动机的平均转矩和效率分别增长2.62%和0.55%,转矩脉动下降50.15%;温度收敛至稳态后,双绕组低谐波永磁游标电动机的平均转矩和效率分别增长2.66%和0.57%,脉动下降50.16%,验证了该低谐波设计方案的有效性.

To reduce the noneffective harmonic content in the armature reaction magnetic field(ARMF)of a permanent magnet vernier motor(PMVM)and realize the high efficiency operation of the motor,a dual-winding low-harmonic permanent magnet verier(DWLH-PMWM)was proposed based on the air-gap magnetic field modulation theory.Firstly,the DWLH-PMVM structure was introduced and the harmonic cancellation principle was illustrated.Subsequently,considering the influence of temperature rise on the performance of conductor windings and permanent magnets,a bidirectionally coupled computation based on the finite element method was adopted to calculate and compare the performances of the conventional PMVM and the DWLH-PMVM,including the air-gap magnetic density,the torque,and the temperature rise.The results reveal that the torque and the efficiency of the proposed motor are improved due to the low-harmonic design.Compared with the conventional PMVM,the average torque and the efficiency of the proposed DWLH-PMWM can be improved by 2.62%and 0.55%,respectively,as well as the torque ripple can be decreased by 50.15%at 20℃.In addition,the torque and the efficiency can be improved by 2.66%and 0.57%,respectively,and the torque ripple can be decreased by 50.16%when the temperature converges to a steady state.Thus the effectiveness of the low-harmonic design scheme is verified.