无轴承永磁同步电机电感特性分析

针对无轴承永磁同步电机电感参数难以通过实验准确获得的问题，采用有限元分析方法研究了四极悬浮控制二极表贴式无轴承永磁同步电机的电感特性.根据无轴承永磁同步电机的工作原理，给出了静态电感和增量电感的定义；在此基础上研究了转矩绕组和悬浮力绕组的静态电感特性，并通过3/2变换得到了在转子两相旋转坐标系下的交直轴静态电感；最后以转矩绕组为例，研究其增量电感，并与其静态电感进行了比较.有限元仿真结果表明:无轴承永磁同步电机增量电感比其静态电感小6%，验证了理论分析的正确性. 

Inductance Characteristics of Bearingless Permanent Magnet Synchronous Motor

In order to solve the problem that the inductance parameters of the bearingless permanent magnet synchronous motor (BPMSM) can not be measured accurately by experiments, the inductance characteristics of a two-pole surface-mounted BPMSM with four-pole suspension system was investigated using finite element analysis. According to the operation principle of the BPMSM, the static and incremental inductances were defined. On this basis, the static inductances of torque windings and suspension force windings in stator frame were studied, and the dq-axis static inductances in rotor synchronous reference frame were obtained by 3/2 transformation. Taking the torque windings as an example, its incremental inductance was studied and compared with the static one. Finite element simulation results show that the incremental inductance value is 6% lower than the static one, which confirms the validity of the theory analysis.