Comparison of the Flux Reversal and Vernier Hybrid Machine for a Hinged Wave Energy Converter

This paper compares two variable reluctance permanent magnet machines – a flux reversal and vernier hybrid variant. The machine, which is being developed in conjunction with Mocean Energy, is required to operate at very low speed. The paper describes the application and electrical topology development, with a focus on the optimization routine used. Results show there is a conflict between peak torque and cogging torque, but also that the peak induced voltage and cogging torque are highly dependent on and sensitive to the rotor tooth width, rather than if the machine is vernier or flux reversal type.