真空干泵驱动用电机转子热问题对比分析

Comparative Analysis of Rotor Heat Problem of Drive Motor for Vacuum Dry Pump

针对真空干泵驱动用电机运行过程中转子热量不易散出,使热量通过转轴传导至轴承引起轴承抱死的问题,以3.0 kW驱动电机为例,分别设计了异步电机(IM)、永磁同步电机(PMSM)和双凸极永磁电机(DSPM)3种方案。在保证3种电机外形尺寸、功率等级和额定转速相同的前提下确定了结构和电磁方案。同时,基于相同的冷却条件分别对3种电机关键部件进行了温度场和应力场仿真。分析结果表明,在额定运行时双凸极永磁电机的转子温升更低,其轴承热形变量最小,能够有效降低电机运行中轴承抱死的风险,更有利于真空干泵机组的长时间稳定运行。

Aiming at the problem that the rotor heat is difficult to dissipate during the operation of drive motor for vacuum dry pump,which causes the heat to be transferred to the bearing through the rotating shaft and the bearing to lock.Taking the 3.0 kW drive motor as an example,three schemes of induction motor(IM),permanent magnet synchronous motor(PMSM)and double salient permanent magnet motor(DSPMM)are designed respectively.The structure and electromagnetic scheme of the three motors are determined on the premise of ensuring that the three motors have the same size,power level,and rated speed.Based on the same cooling conditions,the temperature field and stress field of the key components of the three motors are simulated.The analysis results show that the rotor temperature rise of the DSPMM is lower during rated operation,and the bearing thermal deformation is the smallest,which can effectively reduce the risk of bearing lock during motor operation,and is more conducive to the long-term stable operation of the vacuum dry pump unit.