Performance evaluation of newly developed slotted modulator of co-axial magnetic gears

A modulator and a connecting bridge have made up the magnetic modulator ring in co-axial magnetic gears (CMG). This critical review has examined the combined influence of modulator bridge configuration and varying magnetization on the functionality of a recently created slotted modulator in the CMG model. The magnetic flux density and static torque of the CMG with various structural configurations of the slotted modulating rings have been evaluated using the two-dimensional nonlinear finite element method. Based on the bird's-eye view of the review, the inner modulator bridge with Halbach array magnetization has been found to be the best combination to perform well among the other two combinations. The slotted modulator bridge positions in the center and outer locations have been shown to reduce the magnetic flux density distribution by 4.5% and 9.9%, respectively, when compared to the inner position. Furthermore, the maximum static torque obtained at the inner bridge position and Halbach magnetization has been 169 Nm, which shows a 1.071% improvement. Therefore, this critical analysis recommends using a thinner inner modulator bridge combined with a Halbach array configuration to boost CMG performance.