A Review on Magnetic Gears: Topologies, Computational Models and Design Aspects

Magnetic gears are becoming promising devices for high-torque applications. Recently several new topologies have been proposed to the aim of achieving better performances. In this paper, a general review of magnetic gears is presented, including a discussion of the most common and upcoming topologies and a description of the working principle. In particular, a comparison of different topologies is carried out, in terms of gear ratio and torque density. Furthermore, the main computational techniques generally adopted for coaxial magnetic gears are listed and described. Finally, some key aspects concerning the design are reported.