How is phase displacement, to simulate stator field rotation, obtained?
Two pairs of poles are wired in parallel to the supply and are placed around the circumfrence of a stator housing. One pair of ploes represents the start winding and the other pair represents the run winding. The start winding has fewer poles than the run winding. Therefore the inductive reactance/resistance ratios of the two windings differ, causing a phase displacement between the start winding current and the run winding current