Abstract
In this paper, a novel dual-PM vernier machine (dual-PM VM) is proposed. Stator PMs are magnetized tangentially and set between the stator teeth, while a consequent-pole PM rotor is equipped with radially-magnetized PMs. With the dual-PM topology, the main magnetic field can be increased by forcing the flux-leakage across the stator slots into the stator teeth. Based on the global optimizations, it is found that compared with an existing single-PM inset-type flux-reversal machine (single-PM IFRM), the proposed dual-PM VM can produce 18.1% larger torque with an optimal PM volume and 10.7% larger torque with the same PM volume, respectively. To further improve the torque density, the influences of stator geometric features such as unequal tooth, iron bridge, and slot-opening are studied. It is found that dual-PM VM with unequal teeth, no iron bridge, and no slot-opening can exhibit the largest torque density within the same geometric restrictions.
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