Coil ends and slip rings are not shown; however, it is evident that counterclockwise rotation results in the
coil sides A, B, and C passing under the pole pieces in the order...A-B-C-A-B-C... Voltage polarities
reverse for each change of pole. Assuming that the pole shape and corresponding magnetic flux density
are such that the induced voltages are sinusoidal, the result for the three coils is as shown in Fig. 11-3.
Voltage B is 120 electrical degrees later than A,and c is 240 later. This is referred to as the ABC
sequence. Changing the direction of rotation would result in ...A-C-B-A-C-B...; which is called the
CBA sequence.