Abstract
In this study, the effect of adding of new stator and rotor slots on cogging torque of a transverse-flux permanent-magnet (TFPM) machine with flux concentrators is studied. To reduce the cogging torque, the widths and the positions of the slots of concern are improved through three-dimensional finite element method (3D-FEM). After that, to validate the 3D-FEM results, cogging torque is determined by applying a Schwarz–Christoffel (SC) conformal mapping. To apply this transformation, the 3D TFPM structure with axially magnetised PM is converted into a 2D structure with radially magnetised PMs and cogging torque of the machine is predicted using both the analytical method and 3D-FEM. The agreement in the obtained results through this SC mapping and the 3D-FEM method is the indicative of the accuracy of the efforts.
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