车用永磁同步电机定子铁耗的分析与优化

依据新欧洲驾驶循环工况，以减小电机中高速运行区间的铁耗为目标，对车用永磁同步电机（PMSM）的铁耗进行分析和优化。以一台额定功率35 kW的新能源汽车驱动用PMSM为对象，从电机成本和加工难度角度出发选择转子开辅助槽优化电机的铁耗；对比分析车用电机不同工况下的气隙磁密谐波含量，结合定子特征点处磁密轨迹的观测，分析高速磁场畸变对铁耗的影响；通过转子开辅助槽设计减小气隙磁密谐波，降低涡流损耗，优化齿顶铁损密度；优化后电机铁损最大可减小16%。通过负载试验验证了理论分析的正确性。

Analysis and Optimization of Stator Iron Loss of Permanent Magnet Synchronous Motor for Vehicle

Based on the new European driving cycle, a new optimization method is proposed to reduce the iron loss of the permanent magnet synchronous motor (PMSM) in the medium and high speed working range. A PMSM for new energy vehicle drive with a rated power of 35 kW is taken as the object. Firstly, considering motor cost and processing difficulty, auxiliary slots on the rotor are used to optimize the iron loss of the motor. Then, through the comparison of the harmonic contents of the air gap magnetic density under different working conditions and the observation of the magnetic density trajectory at the characteristic points of the stator, the effect of high-speed magnetic field distortion on the iron loss is fully analyzed. Furthermore, to reduce the motor iron loss, reasonable slots are designed, which can effectively cut down the air gap magnetic density harmonics, reduce eddy current loss, and optimize the iron loss density at the tooth tip. After optimization, the measured motor iron loss is reduced by up to 16%. Finally, load experiment illustrates that the proposed optimization method can achieve better performance.