复合结构混合永磁电机抗退磁性能分析及优化

针对传统稀土永磁电机的稀土永磁材料用量高的问题，本文提出一种由钕铁硼和铁氧体混合永磁的交替极加局部Halbach结构的少稀土永磁同步电机，分析了该复合结构混合永磁电机的结构特点。比较分析了该电机与传统一字型钕铁硼稀土永磁电机的电磁性能，并依据退磁特性建立了该电机的局部退磁有限元模型，通过磁路耦合联合仿真对电机多运行工况进行了仿真，针对高速弱磁和变载运行工况下电机局部退磁的性能损耗，以提高永磁体工作点和降低退磁率为优化目标，给出了该电机的抗退磁优化设计方案。仿真结果验证了所提电机结构的合理性，电机抗退磁性能较优化前提升了10.3%。

Analysis and optimization of anti-demagnetization performance of composite structure hybrid permanent magnet motor

Aiming at the problem of high consumption of rare earth permanent magnet materials in traditional rare earth permanent magnet motor, this paper proposes a rare earth permanent magnet synchronous motor with alternating pole and local Halbach structure composed of NdFeB and ferrite hybrid permanent magnets, and analyzes the structural characteristics of the hybrid permanent magnet motor. The electromagnetic performance of the motor and the traditional one-shaped Nd-Fe-B rare earth permanent magnet motor is compared and analyzed, and the local demagnetization finite element model of the motor is established according to the demagnetization characteristics. The multi-operating conditions of the motor are simulated by magnetic circuit coupling co-simulation. Aiming at the performance loss of local demagnetization of the motor under high-speed field weakening and variable load operating conditions, the anti-demagnetization optimization design scheme of the motor is given to improve the working point of the permanent magnet and reduce the demagnetization rate. The simulation results verify the rationality of the proposed motor structure, and the anti-demagnetization performance of the motor is improved by 10.3% compared with that before optimization.