Position sensorless control by reduced-order extended-flux observer applicable to IPMSM with concentrated windings

This paper proposes a position sensor-less control by reduced-order extended-flux observer applicable to IPMSM with concentrated windings. Generally, the performance of position estimation degrades due to spatial harmonics caused by concentrated windings. This paper realizes position sensorless control using the proposed flux observer, which can suppress influences of inductance spatial harmonics and distortion of back-EMF. In addition, the proposed method shows that position estimation system can realize robust position estimation to speed estimation error. Finally, some experimental results show that the proposed strategy can improve the performance of position sensorless control.