Optimum Design of Permanent Magnet Motor forCogging Torque Reduction Using the Taguchi and Finite Element Method

In spite of high reliability، high torque to weight ratio and the efficiency of brushless permanent magnet motors، cogging torque and torque ripple are the main obstacles in development and application of these motors. In this paper، the Taguchi experiment design method is used for reduction of cogging torque. Case study upon two types of permanent magnet motor is applied for validation of this method. First type is surface brushless permanent magnet motor with 4 poles and 6 slots and second type is Interior Permanent Magnet (IPM) motor with 8 poles and 48 slots. Results from simulations indicate a considerable reduction of the peak to peak value of cogging torque.