Magnetic-Geared Motor Using Superimposed Field Current

Abstract

　Magnetic-geared motors attract attention as a type of low-speed and high-torque motor. However, the maximum torque is limited by the maximum transmission torque between rotors. In order to solve the problem, a magnetic-geared motor with field coils was proposed. On the other hand, the magnetic-geared motor has a complicated stator structure due to its field coils, and low productivity. Therefore, in this paper, we propose a magnetic-geared motor using a superimposed field current which can increase its maximum transmission torque and its control method. The improvement of the maximum transmission torque due to the superimposed current and the effectiveness of the proposed control method are verified using 2-D finite element analysis.