Modeling And Sensorless Vector Control For Vernier Pm Machines

Vernier permanent magnet (VPM) machines have been popular in recent years, which can own high torque density and simple mechanical structure. This paper develops the mathematical model of VPM machine in d-q axis reference frame with consideration of saturation and cross-coupling saturation. Then, the optimal inductance matrix of a VPM machine model is predicted by incorporating finite element analysis (FEA) with linear regression. Further, a back-EMF based sensorless control method is implemented in this VPM machine model with design of controllers and observer. Simulation results show that the VPM machine can be well controlled for steady state and dynamic state operation. Finally, the proposed sensorless control algorithm is validated through experimental test of a 1-kW VPM prototype machine.