High Torque Density Toroidal Winding Permanent Magnet Vernier Machine with Dual Rotor

Due to the short end winding length of toroidal windings, it is conducive to improve the torque density of the machine. Therefore, this paper presents a new type of dual-rotor permanent magnet vernier machine with toroidal winding. First, the toroidal winding can effectively reduce the end-winding length, thus reducing the overall machine volume. Meanwhile, the characteristics of high magnetic field modulation ratio is maintained. Second, the incorporation of dual rotor and toroidal winding effectively improves the utilization of armature winding and enhances machine torque density. Time-stepping finite element method is used to analyze and compare the electromagnetic performance of the existing and proposed machines, such as no-load back EMF, torque output capacity, overload capacity, etc., to verify the effectiveness of the theoretical analysis.