Structural Parameter Optimization to Reduce Cogging Torque of the Consequent Pole In-Wheel Motor

The structural parameter optimization to reduce cogging torque of the consequent pole in-wheel motor (CPM) is studied in this paper. The analysis model of calculating the cogging torque is derived by the energy equations and finite-element analysis (FEA) is carried out for accurate numerical simulation of the cogging torque. The difference between the consequent pole structure and the conventional structure is investigated firstly. Then the influences of structural parameters on the cogging torque, such as pole arc coefficient and widths of slot opening are calculated and analyzed. Beyond that, the slot-pole match and curved iron core to reduce cogging torque are studied. Through the analysis of calculation results, the optimized structural parameters are obtained, and experiment results from two prototypes demonstrate the correctness and feasibility of the proposed methods.