Abstract

Utilization of the unipolar Permanent Magnet (PM) strategy in Hybrid Vernier Machines (HVM) leads to leakage flux reduction. But, its ramification is torque decrease. Improving the average torque of the unipolar PM HVMs is the main aim of this paper. To do this, application of the halbach PM array in stator poles is investigated. A conventional unipolar PM HVM is considered and its stator PMs are replaced by halbach arrays. The proposed machine is optimized based on sensitivity analysis to minimize the cogging torque and maximize the first component of Back Electro Motive Force (Back-EMF). Both machines are evaluated by the time-stepping Finite Element Method (FEM). The results confirm that the proposed machine has better performance than the conventional PM HVM.

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