The Parameter Adaptive Sensorless Control Scheme for Permanent Magnet Synchronous Motor in a Wide-speed Range

In order to reduce the parameter sensitivity of sensorless control for permanent magnet synchronous motor (PMSM) driving system, a parameter adaptive sensorless control scheme is proposed. The parameter identification is implemented by the heterodyne demodulation method in the standstill status based on the rotating high-frequency signal injection method, which could also be used for rotor position estimation in the low-speed range at the same time. In the high-speed range, the sensorless control with respect to the back EMF calculation is carried out based on the identified parameters, then, a parameter adaptive sensorless control scheme could be obtained to achieve normalized sensorless control for PMSM in a wide-speed range. Finally, the effectiveness of the proposed method is verified by the experiment results.