Analytical Calculation of Magnetic Field Distribution in Magnetic Gears with Consequent-Pole Rotors by Subdomain Method

This paper presents a novel coaxial magnetic gear (MG), in which dual consequent-pole permanent magnet rotors are adopted. The MG is attractive for torque conversion in the advanced vehicle thanks to its high torque density. To achieve a comprehensive understanding of the MG, a subdomain model is established to analytically calculate the magnetic field in the MG by solving the vector magnetic potential equations while considering the corresponding boundary and continuity conditions. Consequently, the air-gap field distribution and the electromagnetic performance of the MG can be predicted. The finite element analysis method is also used to validate the accuracy of the proposed analytical method. In comparison with the conventional MG, both methods verify that the proposed MG can offer higher torque transmission density while consume less volume of magnets.