六相永磁容错轮毂电机多物理场综合设计方法

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.