Cogging torque minimization by magnet edge inset variation technique in radial flux surface mounted Permanent Magnet Brushless DC (PMBLDC) motor

This paper presents technique to minimize cogging torque in radial flux surface mounted Permanent Magnet Brushless DC (PMBLDC) motor. Variation in magnet edge inset is done and its influence on cogging torque is analyzed. Magnet edge inset is varied from 0 mm to 2 mm keeping other dimensions same in three standard rating radial flux surface mounted Permanent Magnet Brushless DC Motors. It is observed that this technique is effective and cogging torque can be considerably reduced whereas average torque is marginally affected. Hence, it is very essential to select proper magnet edge inset to reduce the cogging torque in order to improve the performance.