Abstract
A PM vernier motor, which has magnets in both the armature and rotor slots, generates a high torque at low-speed rotation. The pull-out torque of this motor can be increased while maintaining the high power factor by increasing the thickness of the permanent magnets in the machine design process. In this study, the mechanism of this torque increase was analyzed using the finite element method in conjunction with the frozen permeability method. The effects of the permanent magnet thickness are discussed with a focus on the induced electromotive force and the synchronous reactance. As a result, it was revealed that the maintenance of the induced electromotive force and the decrease in the synchronous reactance when the magnet thickness is increased produce the high torque and high power factor that provide the superior performance of this type of motor.
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