Reluctance Motor Rotate at a Faster Rate than Rotating Magnetic Field

Abstract

　Vernier motors have been proposed for low speed and high torque applications. The rotor of the vernier motor rotates slower speed than the rotating magnetic field according to a reduction ratio determined by the relationship between the number of poles of the armature winding and the number of rotor teeth. In this research, we propose a novel motor in which the rotational speed of the rotor is faster than the rotational speed of the rotating magnetic field. General high-speed motors are designed to have two poles due to frequency limitations. On the other hand, the proposed motor rotates at the same rotation speed with multipolar windings. Therefore, the proposed motor can be achieved more compactness than conventional high-speed motors. In this paper, we shown the structure and principle of the proposed motor. Furthermore, the feasibility of the proposed motor was shown by FEM analysis and test of prototype.