Comparative Study of Double-Stator Interior-PM Vernier Machines based on Electromagnetic-Structural Coupling Analysis

Based on the electromagnetic-structural coupling analysis, this paper proposes the comparative study of three double-stator interior- permanent magnet vernier (DS-IPMV) machines, including the spoke-PM, V-shape-PM (V-PM) and H-shape-PM (H-PM) rotor structures. DS cooperation strategies are adopted in the machine design for the performance improvement. Firstly, the rotor optimization of the proposed machines is carried out, with consideration of the tooth-slot cooperation between the rotor and stators. The electromagnetic- structural coupling-simulation is adopted for comprehensive evaluation. Then, the specific performance comparison is carried out, including the magnetic, structural and cost analysis. Consequently, the spoke-PMV machine accommodates the highest torque output, efficiency and cost-effectiveness; meanwhile, the V-PMV machine possesses the highest torque per PM volume with the better ripple performance. Accordingly, prototype experiments are carried out for the validation of the proposed machine design and comparison.