Magnetic force characteristics according to the variation of asymmetric overhang ratio in brushless direct current motor

The magnetic force characteristics of brushless dc motor (BLDCM) with the asymmetric overhang structure of permanent magnet (PM) and the cap of rotor are described. The results show that the variation of the asymmetric overhang ratio has a significant effect on the axial magnetic force except for the radial and tangential magnetic forces.