真空干泵用永磁-磁阻复合式同步电机设计与分析

Design and Analysis of Permanent Magnet-Reluctance Composite Synchronous Motor for Vacuum Dry Pumps

针对真空干泵用驱动电机在真空环境中转子散热难的问题,设计了一种混合励磁永磁-磁阻复合式同步电机。该电机转子永磁体励磁结构由钕铁硼与铁氧体两种磁体组成,旨在改变永磁体的排布方式,降低电机的损耗。首先,构建电机转子的拓扑结构,并设计两种方案来研究永磁体的排列方式对电机性能的影响;其次,分析转子参数对电机空载反电动势和电磁转矩的影响,并对电机转子的尺寸进行调整;然后,对比两种方案的损耗大小,选择损耗更低的电机方案;最后,通过有限元计算对目标电机进行了温度场分析,结果表明,所设计方案的电机温度分布合理,因此通过改变永磁体的排布方式能有效提升电机效率,降低电机损耗,确保电机稳定运行。

Aiming at the problem of difficult rotor heat dissipation in vacuum environment for drive motors for vacuum dry pumps,a hybrid excitation permanent magnet-reluctance composite synchronous motor is designed.The motor rotor permanent magnet excitation structure consists of two types of magnets,NdFeB and ferrite,aiming to change the arrangement of permanent magnets to reduce the loss of the motor.Firstly,the topology of the motor rotor is constructed,and two schemes are designed to study the influence of the arrangement of permanent magnets on the performance of the motor.Secondly,the effect of the rotor parameters on the no-load back electromotive force and electromagnetic torque of the motor is analyzed and the size of the motor rotor is adjusted.Thirdly,the losses of the two schemes are compared,and a low-loss motor scheme is selected.Finally,the temperature field analysis of the target motor is carried out by finite element calculation,and the results show that the motor temperature distribution of the designed scheme is reasonable,so the motor efficiency can be effectively improved by changing the arrangement of the permanent magnets,reducing the motor loss and ensuring the stable operation of the motor.