Figure 6-12. Phase A winding for a four pole, twelve slot motor.
source for each tooth as well as its relative number of turns. For example in Fig. 6-12, Si=l, whereas S ] 2 = - l . In a winding where m single tooth coils appear around a single tooth, the sign and scale factor for the tooth becomes S=Âąm, where the flux direction determines the sign used. The MMF at the center node relative to the stator yoke is found by summing the flux leaving the center node and setting it equal to zero. Doing so gives