Study of Magnets and Pole Pieces Openings in Coaxial Magnetic Gearbox by Reluctance Network

The magnetic gearboxes have received much attention in the last few years. Their numerous advantages, such as low vibration, reduced acoustic noise, and minimum maintenance, are attracting considerable interest for sectors of a high growth like wind turbines and electric vehicles. The present paper aims to study the effect of the magnet and pole pieces opening on the torque of coaxial magnetic gears (CMGs) in order to optimize the latter. It is also about providing a fast and accurate model based on reluctance network method capable of describing the correct electromagnetic behavior of CMG. The confrontation of the obtained results to those calculated by finite element shows a good agreement while guaranteeing a considerable gain in computation time. The proposed model was adopted to optimize the CMG design using parameter-scanning method.