基于多耦合特性的整体支撑式超高速微型永磁电机设计

Design of Ultra High Speed Micro Permanent Magnet Motor with Integrated Support Type Based on Multi Coupling Characteristics

基于超高速微型永磁电机(UHSMPMM)受多物理场特性制约的问题,该文对超高速微型永磁电机支撑系统、电磁(热)设计、结构强度及动力学等方面进行综合设计研究。首先,结合超高速微型永磁电机的工作特性及微型转子结构特点设计整体式支撑系统及电机整机架构;其次,研究高频条件下的电磁-损耗-温升特性,其中重点分析温升特性对转子结构强度的影响,并给出基于温度场耦合下的超高速转子结构强度关键参数的优化方法;再次,探究整体支撑系统中转子临界转速的影响因素及变化规律;最后,依据多耦合特性分析及优化结果,研制一台550000(r/min)/110W原理样机,并对样机进行实验测试。结果显示,该样机实现了稳定运行,从而证明了所提设计方法的有效性。

The ultra-high-speed micro permanent magnet motor(UHSMPMM)is restricted by the multi-physical field characteristics.This paper analyzes the support system,electromagnetic(thermal),structural strength and dynamics of the UHSMPMM.Firstly,combined with the working characteristics of the UHSMPMM and the structural characteristics of the micro-rotor,the integrated supporting system is designed.Secondly,the characteristics of electromagnetic,loss and temperature rise are studied,and the influence of temperature rise characteristics on the structural strength of the rotor is analyzed.The optimization method of the key parameters of the structural strength based on the temperature field coupling is given.Thirdly,the influencing factors and changing rules of the critical speed of the rotor in the integrated supporting system are explored.Finally,according to the multi-coupling analysis and optimization results,a 550000(r/min)/110W prototype was designed and tested.The results show that the prototype has achieved stable operation,which verifies the effectiveness of the proposed design method.