109 / 2020-09-25 22:16:45

Research on Sensorless Control of Permanent Magnet Synchronous Motor Based on High Frequency Injection

Permanent magnet synchronous motor, high frequency injection, sensorless control, rotor position detection, current extraction.

Electric Machine Design and Control > Electric machines

In order to improve the sensorless control  performance of permanent magnet synchronous motor (PMSM) at low speeds, for the use of filters in the process of high-frequency signal extraction, it will bring negative effects such as phase shift. This paper uses a current extraction method instead the filter which used to eliminate its negative effects, then the rotor position and speed are obtained through the phase locked loop (PLL). It is verified by simulation that this method has higher observation accuracy than the traditional filter method.