Influence of stator teeth shaping on cogging torque of radial flux Permanent Magnet Brushless DC motor

Influence of stator teeth shaping on cogging torque developed by radial flux Permanent Magnet Brushless DC motor is investigated. Stator teeth tang radius is varied to alter shape of stator teeth. Stator teeth tang radius is varied form 0 mm to 6 mm for two standard rating motors. It is analysed that peak to peak cogging torque is considerably reduced by selecting proper tooth tang radius. Peak to peak cogging torque is reduced form 27 Nm to 18.4 Nm in case of 10 kW, 1000 rpm motor and 38.2 Nm to 24.6 Nm in case of 20 kW, 1500 rpm motor with this technique.