An Improved Position Sensor-Less Estimator for Vector Control of IPMSM
In this paper, a full order state observer fit for the speed and rotor position is proposed. It can obtain the good tracking performance in the full speed region. In the low speed region, it adopts the high frequency injection method, thus obtains the corresponding high frequency current response which includes the rotor position information, after the band-pass filter and low-pass filter, the signal direct proportional to the position error can be acquired, and get the observed position and speed values in the low speed region. In the mid and high speed region, it uses the improved H8 flux observer to observe the rotor position. In contrast to the scheme proposed in [1], the model proposed in the paper is simple, the computation is relatively small and the range of application is much wider.