Abstract
The design on magnetic gear (MG) involves determining the gear ratio specific to its application. The gear ratio can be determined by the pole number of the inner rotor, outer rotor and the pole piece. In this research, the cogging torque of several pole pair combinations in concentric magnetic gear (CMG) and rotating pole piece magnetic gear (RPMG) were investigated. The gear ratio equations were initially derived for both CMG and RPMG. Based on these equations, four sets of pole pair combinations were determined. The cogging factor was calculated in each combination. To determine the cogging factor significance towards the cogging torque, the magnetic gears were simulated in 2D finite element software. The result revealed that the lower pole pair combination generates lower cogging torque than the higher pole pair combination. The simulation result also shows that the rate of increase in cogging factor did not correlate directly to the cogging torque in the simulation. It is concluded that the cogging factor is not a suitable tool to access the cogging torque level in CMG and RPMG.
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