Steady-State Performance of Polyphase Hysteresis-Reluctance Motors

It is well known that the hysteresis-reluctance motor produces a torque that is a combination of the hysteresis and reluctance effects. Consequently, the performance characteristics of a hysteresis-reluctance motor would be improved when compared to that of the plain hysteresis motor. This paper presents a new design of a hysteresis-reluctance rotor in which the magnetic saliency is created by cutting slots in the inside diameter of the hysteresis ring to produce a 4-pole arrangement in the rotor body. Two rotors were made and tested; one of them was the new hysteresis-reluctance type while the second one was a conventional hysteresis type. Theoretical analysis to predict the performance of the hysteresis-reluctance type as a function of torque angle and motor parameters is carried out. Validity of the proposed analysis is checked by experimental results. A reasonably close agreement between the two is obtained.