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Study of the Influence of the Armature Number of Phases on the Electromagnetic Torque Quality in PM Vernier VRM

Abstract This paper aims at dimensioning and studying three examples of PM Vernier machines with different number of armature phases to analyze, under the same conditions, the influence of the number of phases on the electromagnetic torque quality. An analytical energy model is first introduced along with the pre-design procedure which leads to a first three phase prototype (VRM_1). The performance of the latter is then studied using analytical approach and numerical modeling based 2 D FEM. Two other prototypes of 5 and 7 phases are sized using the same procedure and constraints as the first machine. Their performances are studied using the same approaches and the electromagnetic torques of the three structures are compared.