Four Quadrant Sensorless Operation of a Switched Reluctance Machine Using Fourier Model

A four-quadrant sensorless switched reluctance machine (SRM) controller has been developed using a model based on the Fourier series expansion. The sensorless controller combines two different methods both of which are based on the Fourier model. At zero and low speeds, a pulse injection position estimation method is used to estimate the rotor position in all four quadrants. At high speeds, a sliding mode observer (SMO) based position and speed estimation is used. The use of the SRM Fourier model in the sensorless algorithms provides position estimation with high degree of accuracy. Experimental evaluation demonstrated the superiority of the Fourier model over the models developed in previous research