SINUSOIDALLY DISTRIBUTED SINGLE-PHASE WINDING
A 2-pole sinusoidally distributed winding is excited with a sinusoidal current. The resulting pulsating radial flux density distribution is shown plotted along a circular path in the air gap (which is greatly enlarged for visual purposes). This spatial sinusoidal field distribution can be represented by a 2D space vector located along the (horizontal) axis of the winding; the vector points to where the field is maximum positive and has a length proportional to the maximum field strength at that instant.