Achieving Magnetic Force and Cogging Torque Reduction in a Permanent Magnet Generator with Concentrated Slot Technique and Pole Arc Optimization at Magnet Edge

The objective of this study is to minimize cogging torque in permanent magnet machines (PMMs) utilized for renewable energy generation. The primary concern identified is the interaction between the magnetic flux of the rotor and the slot opening of the stator, which interferes with rotor rotation and results in reduced efficiency. The techniques of concentrated slotting and pole arc optimization (PAO) are employed to address this issue at the magnet's edge. The study utilizes the response surface method (RSM) in conjunction with the finite element method (FEMM version 4.2) to illustrate a reduction in cogging torque by as much as 99.04% relative to the baseline model. This result underscores the capability of these techniques to substantially improve PMM performance, especially within renewable energy applications.