基于VPVM永磁同步电机无传感器控制策略的研究

Study of the Control Strategy Based on the VPVM for Sensorless PMSM

贴面式永磁同步电机的无传感器控制在低速和静止时一直存在着转子位置难以检测和估算的问题,本文针对该情况提出了一种新的无传感器控制策略。转子初始位置检测是根据定子铁心的非线性磁化特性,采用电压脉冲矢量注入法(VPVM)。这种方法不需要电机参数和额外的硬件设施.电机开始运行时,由闭环自适应磁通观测器估算转子位置、速度.通过MATLAB仿真,从理论上验证了该方法的有效性。

In this paper,a new approach to sensorless speed control and initial rotor position estimation for a surface-mounted permanent magnet synchronous motor （SPMSM） drive is presented. At a rotating condition,speed and rotor position estimation of SPMSM drive is obtained through a self-adaptive flux observer （SAO） by only measuring phase voltages and currents. The initial rotor position is performed by using the nonlinear magnetization characteristics of the stator core caused by the rotor magnets. Experimental results show that in both steady and transient state,the system can all achieve expected performances.