Harmonic Suppression For Low Speed Sensorless Control of SPMSM Based on High Voltage Frequency Pulsating Signal Injection

Abstract

Ordinarily, at zero and low speed, the rotor position information for surface-mounted permanent magnet synchronous motor (PMSM) without any position sensor is obtained by the high frequency pulsating voltage signal injection, and there are position detection harmonic errors caused by non-ideal factors such as inverter nonlinear factors and current detection errors in practical applications. Firstly, the origin of the error is analyzed and the specific expression is given. Secondly, a rotor position observer based on the second order generalized integrator (SOGI) and notch filter is proposed. The SOGI is used to extract the high-frequency components, and then the notch filter is used to eliminate the harmonic errors. Finally, the simulation results indicate that the proposed method can effectively eliminate the harmonic errors in position estimation and ameliorate the performance of sensorless control.