Relationship between magnetic gears and vernier machines

It is demonstrated that a vernier machine and a magnetic gear work under a same principle, and the vernier machine teeth perform the flux modulation function, same as the ferromagnetic pieces do in a magnetic gear. A vernier machine is equal to a system consisting of a magnetic gear and a normal machine. Moreover, this paper presents how to convert a magnetic gear machine system to a vernier machine, and discusses structure differences among vernier machine, magnetic gear, and many other magnetic gear based topologies. It is illustrated that all these topologies share a same operation principle. This conclusion is verified by FEA simulation results. Finally, advantages and disadvantages of each topology are discussed and some application suggestions are given as well.