Design of permanent magnet synchronous motor with low cogging torque

The improvements of the new structure of permanent magnet synchronous motors (PMSM) with the low cogging torque for the ceiling fan is presented. The new type motor is designed by using the phase-shift, half-thickness interior permanent-magnet embedded in oblique slot of rotor is implemented to yield less torque fluctuation and cogging torque. The energy also can be saved at least 50% when the new type motor is compared to the conventional fan based on the induction motor. The cogging torque also can be improvement by using the sin back EMF voltage. The implementation of the 14-pole, 12-slot PMSM with the linear relationship between the peak electromotive-force and speed is also given. The electromotive-force harmonic distortion measured is 1.03 %. A prototype of inverter for PMSM with 100 W, 200 rpm, 5 N-m torque output is developed. The current harmonic distortion measured is 2.84 %.