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Comparative Study of Airgap Field Modulation in Flux Rever-sal and Vernier Permanent Magnet Machines.

In this paper, the torque production mechanisms of both flux reversal permanent magnet (FRPM) machines and Vernier PM machines are analyzed based on airgap field modulation. The differences in their working harmonics of either PM magnetomotive force (MMF) or airgap permeance distribution are firstly identified, indicating that the fundamental PM MMF together with all permeance harmonics contribute to the torque production of Vernier machine whereas all PM MMF harmonics but only fundamental permeance in FRPM machine produce the torque. Thanks to the utilized large DC component of airgap permeance, the superior torque density of Vernier machine is revealed and verified by both analytical and finite element analyses (FEA).