Analysis of Fault-Tolerant Permanent Magnet Vernier Machines With Improved Output Torque

Abstract

In this paper, the analysis of fault-tolerant permanent magnet vernier (FTPMV) machine with improved output torque is carried out. It is found that by adopting some more reasonable designs in magnetic field modulation poles, stator-rotor poles and phase-slot numbers, the flux modulation effects can be enhanced and the output torque can be improved about 180%. Firstly, the machine topologies and working principle of FTPMV machines are introduced. And then the expression of output torque is derived by analytical model. The modulation magnetic field is analyzed and some key parameters affecting flux modulation effects are located. Then, the influences of these parameters on flux modulation effects are analyzed in detailed and the approaches for improving output torque are obtained. Lastly, two FEA FTPMV models are established and compared for highlighting the analytical results and these results are validated by experiments made on a prototype machine.