Analysis and Design of a New Type of Polymer-Magnet Permanent Magnet Fault-Tolerant Vernier Motor

This study focuses on the Spoke Array Fault-Tolerant Permanent Magnet Vernier Machine (SAFTPMVM) which, due to its magnetic concentration effect, has a high torque density. However, an increase in air gap length significantly affects this magnetic concentration, thereby drastically reducing the motor's torque density. To address this issue, a new structure called the Fault-Tolerant Concentrated Flux Permanent Magnet Vernier Machine (FCFTPMVM) is proposed. This structure enhances the fundamental and low-order harmonic of the air gap magnetic density, thus increasing torque density without additional permanent magnet material. The principle of torque enhancement was analyzed using the equivalent magnetic circuit method, and the impact of structural parameters on torque performance was studied using finite element methods. This led to the design of optimal motor structural parameters. A comparative analysis of the electromagnetic performance of surface-mounted, spoke array, and the new concentrated flux structure motors was conducted using finite element analysis. The results demonstrate that the proposed FCFTPMVM motor exhibits high output torque, low torque ripple, high efficiency, and strong fault tolerance capabilities.