无轴承永磁同步电机转子偏心位移的直接控制

无轴承电机运行时由于负载扰动使其转子产生的径向偏心影响了其稳定悬浮性能，因此如何采取直接有效的方法控制转子偏心位移、使转子稳定悬浮成为无轴承电机研究的重点。文中对无轴承电机中的麦克斯韦力进行详细研究后，根据径向偏心位移和径向悬浮力之间的关系，基于可控径向悬浮力产生的机理，采用转子磁场定向，对转子偏心位移的控制提出了一种全新的控制方法：无轴承永磁同步电机转子偏心位移的直接控制，并设计了相应的控制系统。仿真结果表明，该方法有效地提高了无轴承电机稳定悬浮运行的动、静态性能，实现了对转子偏心位移的直接控制。

Direct Control for Rotor Eccentric Displacement of Bearingless Permanent Magnet-type Synchronous Motors

A time stepping finite element analysis(FEA) model coupled circuit field and movement used in analyzing permanent magnet brushless DC(BLDC) motors is presented in this paper,which can solve the problem of non-sinusoidal power supply in field-circuit coupled FEA. The converting process of switching element operation and electric position fluctuation of the circuit winding neutral point are taken into account in circuit equation. The element analysis about the coupling problem of control circuit and field is researched. An improved moving finite element method,interpolation moving boundary method,is adopted to solve rotation problem. The performance of a BLDC motor is analyzed using above model. The calculation result is very close to the measure results. This method can be used in analyzing other non-sinusoidal power supply machines.