Torque Ripple Reduction of Reluctance Motor with Slit Rotor

Torque ripple reduction methods of synchronous reluctance motors are studied in this paper. The first method is to distribute magnetic circuits generated by a slit rotor at pitches of (π+1/2•slit pitch, π-1/2•slit pitch) . The second one is to distribute them at pitches of (π+2/3•slit pitch, π-1/3•slit pitch). The third one is the vernier construction which is used in induction motors. And the forth one is the skew construction . These methods are analyzed by the finite element method. They are also studied experimentally. As the results, these methods are shown to be very effective to reduce torque ripples.