This paper deals with the high power brushless DC motor (BLDCM) for the traction of a 48 V golf cart system. As shown
in Fig. 1 the stator is designed with segment rectangular copper
winding to enhance the output power within its limited dimensions. As a result, this could increase the slot fill factor by about
70–75% and reduce the length of end winding which was the
cause of the resistance loss. But a slot fill factor is 40–45% in
conventional motors designed with a round copper wire. It is
possible to increase the slot fill factor by hand, but mass productivity has to be considered. In the automobile application
mentioned above, the number of turns per slot of the motor
is restricted within the wide variable speed range and the high
output torque on the condition of the limited dc link voltage in
the inverter