超高速AFPM电机转子系统的轴向冲击响应与结构优化

The power and speed of the radial flux permanent magnet (RFPM) motor which is usually applied in traditional ultra-high speed motor direct drive system are limited by the axial length and the rotor is difficult to cool as well. Therefore, this project proposes a solution in which the axial flux permanent magnet (AFPM) motor instead of the RFPM motor will be used in the direct drive system. Aiming at the gas foil bearings (GFBs)- single stator – single rotor AFPM motor system, axial impact response of the ultra-high speed AFPM rotor system and will be studied and the structure optimization will be executed accordingly by using theoretical and experimental methods. This project will build the PM stiffness and winding current stiffness by 3D field reconstruction method, and analyses the influence of axial air gap geometry on the parasitic bearing effects of the AFPM motor. In order to check the impact of structural parameters of the AFPM motor on the steady operating point of GFBs and transient axial shock responses of the GFBs-AFPM rotor system, the project will build a 5 freedoms GFBs-AFPM rotor dynamical model and solve it by state equations and trajectory method. Optimization design criteria of GFBs- single stator - single rotor ultra-high speed AFPM motor will be summarized. Research results will provide a theoretical reference to suppress the sub-synchronous whirling and exploit the steady operation region of the GFBs-AFPM rotor system, and will also promote the development and application of the high efficiency, clean and low carbon high speed direct drive sets.

针对传统超高速电机直驱系统中径向磁通永磁（RFPM）电机功率及转速受轴向长度限制、转子散热困难等问题，本项目提出轴向磁通永磁（AFPM）电机替换RFPM电机的方案，将采用理论分析结合试验，研究弹性箔片轴承GFBs-单定子单转子AFPM电机转子系统的轴向冲击响应特性及结构优化。拟采用三维场重构法建立永磁刚度、定子绕组电流刚度矩阵，研究轴向气隙几何形状对AFPM电机“附加轴承”刚度的影响机理；建立计入轴向GFBs和“附加轴承”刚度影响的5自由度GFBs-AFPM电机转子系统动力学模型，采用状态方程和轨迹法求解，重点分析电机结构参数对GFBs稳态工作点和GFBs-AFPM电机转子系统轴向冲击响应特性的影响机理；建立超高速AFPM电机的结构优化准则。研究结果将为抑制GFBs-AFPM电机转子系统的亚同步涡动，拓宽其稳定运行空间提供理论支持，对开发高效、清洁低碳的高速直驱机组具有重要的工程应用价值。

针对传统超高速电机直驱系统中径向磁通永磁（RFPM）电机功率及转速受轴向长度限制、转子散热困难等问题，本项目提出轴向磁通永磁（AFPM）电机替换RFPM电机的方案，将采用理论分析结合试验，研究弹性箔片轴承GFBs-单定子单转子AFPM电机转子系统的轴向冲击响应特性及结构优化。建立了永磁刚度、定子绕组电流刚度矩阵，研究轴向气隙几何形状对AFPM 电机“附加轴承”刚度的影响机理；建立计入轴向GFBs和“附加轴承”刚度影响的5自由度GFBs-AFPM电机转子系统动力学模型，采用状态方程和轨迹法求解，重点分析电机结构参数对GFBs稳态工作点和GFBs-AFPM电机转子系统轴向冲击响应特性的影响；建立超高速AFPM电机的结构优化准则。设计了超高速AFPM电机的转子，当每极每相匝数为6时，脉动转矩只占总转矩的0.8%，反电动势较原始转子增大7.69%。当电枢通入三相对称的正弦交流电流时，脉动转矩只含有基波的6倍频、12倍频、18倍频等成分。研究结果将为抑制GFBs-AFPM电机转子系统的亚同步涡动，拓宽其稳定运行空间提供理论支持，对开发高效、清洁低碳的高速直驱机组具有重要的工程应用价值。