六相永磁容错轮毂电机多物理场综合设计方法

针对电动装甲车用轮毂电机工况复杂多变，发热严重的问题，通过对电机所涉及各物理场之间关系的分析，提出了一种永磁容错轮毂电机多物理场设计方法。利用该方法对一台电动装甲车用额定功率50 kW，最高转速6 000 r/min六相永磁容错轮毂电机进行了综合设计。在电机结构初步设计基础上，通过电磁-应力耦合分析，在兼顾电磁性能和转子强度的情况下对转子隔磁磁桥进行优化设计；通过电磁-温度耦合分析计算了电机内各区域温度分布，并对永磁体在极限温度下的退磁进行了校核；通过应力-温度耦合设计完成了转子与护套的最大应力计算，校核了护套厚度及过盈量。仿真结果表明，基于多物理场综合设计方法得到的电机能同时满足电磁性能、温度限制以及机械强度的要求，电机可靠性得到了提高。 

Integrated design method of six-phase fault-tolerant permanent magnet in-wheel motor based on multi-physics fields

Based on the analysis of the relationships between the physical fields that the in-wheel motor is involved in, an integrated design method for fault-tolerant permanent magnet in-wheel motor is proposed, aiming at solving the problems of complex working conditions and serious heat of the in-wheel motor for electric armored vehicles. A 50 kW, 6 000 r/min six-phase fault-tolerant permanent magnet in-wheel motor is designed by the integrated method. On the basis of the preliminary design of the motor structure, the optimal design of the flux barrier is achieved by the electromagnetic-stress coupling design, taking both the electromagnetic performance and the mechanical strength into account. Meanwhile, the temperature distribution of the motor is calculated and the demagnetization of the magnets is completed by electromagnetic-thermal coupling design. Furthermore, the maximum mechanical stresses of the rotor and the sleeve are analyzed, and the thickness of sleeve and the interference fit between the rotor and the sleeve are verified by the thermal-stress coupling design. The simulation results show that the motor designed by integrated design method based on multi-physics fields can meet the requirements of electromagnetic performance, temperature limitation and mechanical strength. Therefore, the reliability of the motor is enhanced.