Design of an L-Shaped Hybrid PM Array in Coaxial Magnetic Gear

This paper proposes a coaxial magnetic gear that has the advantages over current models in terms of torque density, cogging torque, and iron losses. In this magnetic gear, a new magnet arrangement called L-type is used to combine the good features of spoke-type and V-type arrangements. To further minimize the cogging torque in this design, a skewed modulator is also employed. The permanent lack of availability and the unstable supply chain of rare-earth magnets, as well as the reduction of the final cost of the structure, have been resolved by the simultaneous use of rare-earth and ferrite magnets in this structure. The proposed structure is optimized using multi-objective genetic algorithm and its mechanical and electrical performance is compared with a conventional radial flux structure.