Optimization of Cogging Torque in A Hybrid Axial and Radial Flux Permanent Magnet Machine

A novel hybrid axial and radial flux permanent magnet machine is proposed in this paper. T-type SMC core, reluctance rotor and PM rotor are applied in the machine. Structure of reluctance rotor, magnet pole-arc ratio, magnet skewing mode, magnet skewing angle and position angle are analyzed to optimize the cogging torque using finite-element method (FEM). Then, response surface methodology (RSM) and genetic algorithm (GA) are applied to optimize the cogging torque. Finally, a 3-D FEM model is built and comparative work is carried out between the original and optimized design. The validity of RSM and GA is verified through the FEM results.