High-Speed Sensorless Control Strategy of SRMs: Utilizing Fourth Order Generalized Integrator to Enhance Control Performance and Overcome Magnetic Characteristic Constraints

Pre-storing magnetic characteristic parameters are essential to achieve high-speed sensorless control of switched reluctance motors (SRMs). However, creating an accurate table of nonlinear flux linkage based on magnetic characteristic parameters requires time-consuming offline measurements. To overcome this challenge, a novel high-speed sensorless control scheme is introduced, utilizing a Fourth Order Generalized Integrator (FOGI). This method offers the capability to precisely estimate the rotor position and speed, even in scenarios where the magnetic characteristic parameters are unknown. An additional advantage of the FOGI approach lies in its high-order characteristics, which provide effective filtering capabilities and robust resistance against interference. The proposed high-speed sensorless control method is validated and compared with the conventional sensorless control method based on a 5.5 kW 12/8 three-phase SRM experimental setup. The results indicate that the proposed sensorless control method has higher estimation accuracy and stronger anti-interference ability compared to the conventional method.