Cogging Torque Reduction Methods in Magnetic Gears: A Comparative Study

With the aim of studying the magnetic effect of cogging torque regarding the performance of magnetic gears (MGs), two approaches have been built and arranged in two parts. Firstly, a slicing approach has used and applied to the all parts (magnets, modulators, and back irons) of the MG to minimize the cogging torque (no load torque or static torque) generated in permanent magnet (PM) machines. Secondly, a slitting approach has used and applied only to the modulators of the MG. The two approaches have analyzed using finite element method and the results achieved the desired goal in mitigating the cogging torque. However, the useful torque is increased by the first method and slightly decreased by the second method.