Position sensorless control of Interior Permanent Magnet Synchronous Motors

Aiming at realizing the position and speed sensorless control of Interior Permanent Magnet Synchronous Motors during the full speed range including zero speed, this paper introduced a hybrid rotor position self-sensing approach. To get the rotor position, the extended-EMF estimation was used in high-speed range and the high frequency signal injection method was used in low and zero speed ranges. Simulation studies show that the hybrid rotor position self-sensing approach can precisely estimate the rotor position and speed at low speed range, and can achieve fast dynamic response at high-speed range. Therefore, the proposed scheme is suitable for the sensorless vector control of an Interior Permanent Magnet Synchronous Motor in a wide speed range, including zero speed.