HIGH STARTING TORQUE ECCENTRIC WINDING SHADED POLE MOTOR

摘要

A single phase, shaded pole, alternating current induction motor which includes a stator core member having at least one pair of pole piece assemblies. Each pole piece assembly comprises first and second portions, the first portion having a shading coil thereon on the side thereof remote from the second portion which forms shaded and unshaded sections of the first pole piece portion. A first coil embraces each pole piece assembly and a second coil embraces the first portion only of each pole piece assembly. The first coils are connected in series to form a first winding and the second coils are also connected in series to form a second winding, the first and second windings being connected in series. A speed-responsive switch is provided having first and second positions, the switch in its first position coupling the first winding for energization across a single phase, alternating current source for starting the motor. The switch is actuated to its second position in response to a predetermined motor speed in which both the first and second windings are serially coupled for energization across the source. The coils on each of the pole pieces are arranged so that upon energization of both the windings the unshaded pole piece sections respectively have greater magnetomotive force therein than the second pole piece portions.