High Gear Ratio Surface Permanent Magnetic Gear

A magnetic gear can transmit torque and motion without any mechanical contact, and also has wide applications in various systems where increase/decrease in speed has a vital role, but high reduction gear has not been proposed yet. In the mechanism, eddy currents are induced in the stator gear teeth. In this paper, the stator gear for high-speed which intercepts eddy currents is developed first, then, a new type surface magnetic gear is presented which has high gear ratio mechanism, and its characteristics are evaluated using two-dimensional FEM analysis. It is ascertained that the new high gear ratio magnetic gear is compact when compared with conventional mechanical multi stage gear, and also has high transmission torque compared with the single stage magnetic gears.