Position Estimation Error Correction Strategy Based on Dual-Gap Dual-Pole Composite Machine

The accuracy of rotor position observation error affects the performance of sensorless control. However, it is inevitable that the rotor position error of the sliding mode observer (SMO) method based on the extended back electromotive force will appear. This paper describes the causes of position error based on SMO and proposes a correction strategy for the electrical angle of the dual-gap dual-pole composite machine (DDCM). Finally, simulations and experiments are performed to verify the feasibility of the proposed method.