Investigation of the influence of variations in the number and width of anti-notch depending on cogging torque reduction

Cogging torque is one of the electromagnetic torque. This torque appears at the beginning of the rotation of permanent magnet electric machine, caused by the interaction between the stator slots and an electromagnetic field generated by the permanent magnet. Cogging torque pursued as small as possible so that the movement of the rotor is not hampered. Cogging torque reduction have researched for many years with a lot of methods. This research study continued from earlier study of cogging torque reduction using anti notch method. In this paper, the width and variation in some anti notch became investigated variable to cut the cogging torque. The 4 degree half cylinder anti notch simulate using FEMM 4.2 and the result is 4 degree width and one of anti notch has the highest reduction of the cogging torque. Adding coupled number of anti notch is not too influence to cogging torque reduction.