Output characteristics of a surface permanent magnet-type vernier motor - Comparison of test results and calculation

This paper describes a surface permanent magnet (SPM)-type vernier motor that can generate high torque at low speeds, and a simple, high-speed method for analyzing its output characteristics is proposed. In this method, if the induced electromotive force, the synchronous reactance, and the iron loss are provided by finite element analysis (FEA), the output characteristics can be calculated immediately using the voltage and torque equations on the γ and d axes. The proposed method is simpler and faster than the general method that uses FEA only. In this paper, the voltage and torque equations of the SPM-type vernier motor are derived, and the proposed analysis method using these equations is presented. Moreover, the agreement of the results calculated using this method with the measured values confirms a high degree of accuracy.