Design of surface permanent magnet-type vernier motor using Halbach array magnet

A surface permanent magnet (SPM)-type vernier motor whose rotor uses Halbach array magnet is designed in this study. Voltage and torque equations are derived, and an output calculation method and design process based on these equations are proposed. A high-output power motor and a high-power factor, high-efficiency motor are designed using the proposed design process, and the output characteristics are clarified using the proposed calculation method and finite element analysis. A high-output power motor with a maximum output of 11.9 kW is designed. A high-power factor, high-efficiency motor with a maximum output exceeding 6 kW is also designed; the power factor and efficiency of this motor at 4 kW are more than 90% and more than 85%, respectively. The proposed calculation method and the design process are shown to be very effective.