Torque quality of Interior Permanent Magnet Synchronous Motor (IPMSM) is very sensitive to some of rotor parameters and dimensions. These sensitivities can be exploited to reduce the cogging torque and torque pulsation. This thesis presents a new analytical approach to mitigate the cogging torque, using a simplified magnetic circuit model. The method results in a new air-bridge shape with very low cogging torque. The Finite Element Method (FEM) results show that the presented design not only mitigates the cogging torque, but also significantly reduces the total torque pulsation. Finally the optimal design is presented, based on torque quality of the motor at rated load and steady state conditions and using magneto static analysis. Compared to other methods, this method is very affective in suppressing the torque pulsation.
