轴向磁场混合永磁记忆电机电磁转矩精确分离

Accurate separation of electromagnetic torque for axial field hybrid permanent magnet memory motor

为了解决传统记忆电机转矩密度较低,电枢绕组与励磁绕组空间位置冲突等问题,结合轴向磁场永磁电机,提出一种新型轴向磁场混合永磁记忆电机.该电机采用定子分离结构,使用NdFeB与AlNiCo混合励磁,实现宽调速范围和高转矩密度.为了分析不同永磁体对新型电机输出转矩的贡献,解决传统冻结磁导率法无法准确分离电磁转矩的问题,提出一种新型冻结磁导率法,并对比分析了2种方法的分离结果.结果表明:在不同磁化状态下,新型转矩分离方法的分离精度始终高于传统转矩分离方法,与有限元计算结果的相对误差始终小于5%;在正向完全充磁状态下,新型转矩分离方法与有限元计算结果的相对误差仅为0.94%.所提转矩分离方法实现了新型记忆电机中电磁转矩的精确分离.

To solve the problems of the traditional memory motor,such as low torque density and space conflict between armature winding and excitation winding,combined with the axial field permanent magnet motor,a novel axial field hybrid permanent magnet memory(AFHPMM)motor is proposed.The motor excited by both NdFeB and AlNiCo utilizes the stator separation structure to achieve wide speed range and high torque density.In order to analyze the contribution of different permanent magnets(PMs)to the output torque of the novel motor and solve the problem that the traditional frozen permeability method(FPM)cannot accurately separate the electromagnetic torque,a new FPM is proposed and the separation results of the two methods are compared and analyzed.The results show that the separation accuracy of the new torque separation method is always higher than that of the traditional torque separation method under different magnetization states,and the relative error between the new method and the finite element calculation is always less than 5%.The relative error between the new torque separation method and the finite element calculation results is only 0.94%in the forward fully magnetized state.It is proved that the proposed torque separation method can achieve the precise separation of electromagnetic torque in the novel memory motor.