Improvements of power factor and torque of a synchronous reluctance motor with a slit rotor

Abstract

Power factor and torque of synchronous reluctance motors with a slit rotor are studied. In there stators, divided teeth made of powder magnetic core are adopted and windings are improved to get high space factor of stator windings and to shorten coil ends. In there rotors, stainless sheets are inserted among soft magnetic metal sheets with adhesive to strengthen the rotors and rotor structure is improved to enlarge the saliency ratio (L d/L q). As the result, the power factor 0.78 and 1.6 times torque at same motor size are attained.