一种非对称混合永磁拓扑的电机转矩特性分析

Torque Characteristics Analysis of a Hybrid Permanent Magnet Motor With Asymmetric Topology Design

本文通过将“非对称磁路”的设计理念与混合永磁体拓扑结构相融合,提出一种具有“钕铁硼+铁氧体”协同励磁特点的非对称磁路混合永磁电机。通过充分考虑混合永磁体的结构特点,深入分析了磁路的非对称设计机理。为了充分地挖掘该电机的转矩能力,针对性地从钕铁硼转矩分量和铁氧体转矩分量的角度来分析电机的转矩特性。并且,采用冻结磁导率法,实现对钕铁硼转矩分量和铁氧体转矩分量的有效提取与分析。经过参数的优化设计,有效实现了不同转矩分量电流角之间的逼近效应,从而提升了永磁磁场利用率,实现了转矩性能的提升。

This paper combined the concept of‘asymmetric magnetic circuit’with the hybrid PM motor,and proposed a hybrid PM motor with the co-magnetic source of“NdFeB and ferrite”.By fully considering the structural characteristics of the hybrid PM,the design principle of asymmetric magnetic circuit was analyzed.And to study the torque characteristics of the motor,the torque motor was analyzed from the perspective of the NdFeB torque component and the ferrite torque component.In addition,the frozen permeability method was adopted to realize the effective separation and analysis of the NdFeB torque and the ferrite torque.Through the parameters optimization,the approximation effect between the current angles of different torque components was effectively realized,thereby improving the utilization of the PM magnetic field and realizing the improvement of the torque performance.