ROTOR POSITION DETECTION SCHEME FOR SYNCHRONOUS RELUCTANCE MOTOR BASED ON CURRENT MEASUREMENTS

A rotor position detection scheme which utilizes the characteristics o f the synchronous reluctance motor is proposed. In particular, the dep endence of the self and mutual inductances on the rotor position is ut ilized, The motor currents are controlled by a transistor inverter in the manner of hysteresis current control. The inverter switching creat es ripples in the phase currents. The rate change of current in the ri pples is then detected and converted to a rotor position signal. The p roposed scheme is aimed to provide rotor position information particul arly at low rotor speed, even at zero rotor speed, Numerical analysis of the rate change of the phase current of the synchronous reluctance motor is also discussed.