内置式永磁同步电机转子初始位置检测方法

Initial Rotor Position Estimation Method for Interior Permanent Magnet Synchronous Motor

针对无位置传感器内置式永磁同步电机的转子初始位置检测问题,提出一种基于旋转高频电压注入法和恒定磁场定位法的永磁同步电机转子初始位置检测方法。基于凸极跟踪的原理,通过注入旋转高频电压信号的方法获得估计转子位置,在此基础上,采用恒定磁场定位法对估计转子位置的磁极极性进行判断,实现对估计转子位置的极性校正,并且补偿估计转子位置的偏移误差,从而得到转子初始位置。在实验平台上进行了实验验证,实验结果表明文中提出的方法能够快速且准确地检测出转子初始位置,实现永磁同步电机无位置传感器可靠起动。

In order to achieve the estimation of the initial rotor position for a position sensorless interior permanent magnet synchronous motor, a hybrid method based on rotating high frequency voltage signal injection together with a constant magnetic field method is proposed. First of all, an estimated rotor position is obtained by injecting high frequency voltage signal into stator winding. On this basis, a constant magnetic field method is used to identify the magnet polarity of the estimated rotor position. What’s more, it compensates the estimated error automatically. Then the initial rotor position can be obtained. In the end, the verification experiments were implemented on the experimental platform. The experimental results show that the proposed approach can identify the magnet polarity of the initial rotor position accurately and start up the permanent magnet synchronous motor successfully and reliably.