新型沙漏形隔磁结构的主副齿式永磁游标电机的设计与分析

Design and analysis of novel main and secondary tooth permanent magnet vernier motor with hourglass-shaped magnetic insulation

基于传统交替极双定子分裂齿式永磁游标电机的拓扑结构提出一种新型沙漏形隔磁结构的主副齿式永磁游标电机,旨在进一步提高电机转矩密度和解决永磁体极间漏磁的问题。依据磁场调制原理,首先对定子主齿和副齿的结构参数进行优化设计,主齿的调节作用使低速旋转永磁体磁场和高速旋转电枢磁场进行耦合,副齿对气隙磁场进一步调节产生其他次有效谐波增加电机的同步转矩分量。在永磁体两侧引入沙漏形隔磁结构,该结构不仅抑制极间泄漏,而且大大降低永磁体径向应力和径向形变;并探究永磁体极弧系数对转矩及功率因数的影响,确定优化设计后的模型参数。最后用有限元仿真结果验证了沙漏形隔磁结构的主副齿式永磁游标电机的优越性,相较于传统的分裂齿式永磁游标电机,该电机具有更大的转矩和更小的转矩脉动。

Based on the topology of traditional alternating poles double-stator split-tooth permanent magnet vernier motor,a novel main and secondary tooth permanent magnet vernier motor with hourglass-shaped magnetic insulation was proposed,aiming at further improving the motor torque density and solving the problem of inter-pole leakage of NS-pole permanent magnets.Based on the magnetic field modulation principle,the structural parameters of the stator main and secondary teeth were optimized.The regulating action of the main tooth can achieve effective coupling between the low-speed rotating permanent magnet magnetic field and the high-speed rotating armature magnetic field.The air gap field was further regulated by the secondary tooth,which generates other effective harmonics to increase the synchronous torque component of the motor.The hourglass-shaped magnetic isolation structure was introduced on both sides of the permanent magnet,which not only suppresses inter-pole leakage,but also greatly reduces the radial stress and deformation of the permanent magnet.The influence of the polar arc coefficient of the perma nent magnet on the torque and power factor was investigated,and the optimized model parameters were determined.Finally,the superiority of the main and secondary tooth permanent magnet vernier motor with hourglass-shaped magnetic insulation was verified by the finite-element results.Compared with the traditional split tooth type permanent magnet motor,the motor has greater torque and less torque ripple.