A Comparative Analysis of Different Double-Stage Magnetic Gear Transmission Systems with High Gear Ratio

The design procedure of two different double-stage Magnetic Gear Transmission systems (MaGTs) is presented in this paper. The MaGTs are characterized by the same maximum input torque and speed, but by different Permanent Magnet (PM) materials, namely NdFeB and Ferrite. The design procedure consists of optimizing the MaGT inner and outer stages sequentially, by selecting the cheapest configurations among all those that comply with both mechanical and magnetic constraints. The performances of the designed MaGTs are determined and compared to each other by both an analytical approach and Finite Element Analyses (FEAs), which are carried out by means of FEMM and SolidWorks software. The comparison reveals the most important advantages and drawbacks of each configuration, together with their possible future developments.