High-Torque Rotor Structure with Flux Collection Iron Core in Small Spoke Array Permanent Magnet Vernier Motor

A high-torque rotor design for small spoke array permanent magnet vernier motors (PMVMs) is proposed based on a simulation using the finite element method (FEM). The rotor structure of the spoke array PMVM is designed with a focus on the shapes of the permanent magnet and flux collection iron core. The pull-out torque calculated using the FEM is then evaluated. The high-torque rotor design, torque-increasing mechanism, and function of the flux collection iron core are discussed based on the torque equation with a focus on the counter electromotive force and synchronous reactance.