Patent ID: 8773062

Claim:
A polyphase electric motor comprising: a rotor; a stator with a plurality of slots; a plurality of main windings installed in the plurality of slots of the stator, a first main winding of the plurality of main windings corresponding to a selected phase of an available alternating current power source; and a plurality of auxiliary windings installed in the plurality of slots of the stator, a first auxiliary winding of the plurality of auxiliary windings corresponding to the selected phase of the available alternating current power source, the plurality of auxiliary windings being connected to motor terminals of the polyphase electric motor through a plurality of capacitors, the plurality of auxiliary windings and the corresponding capacitors being connected in parallel to the plurality of main windings; and wherein the first main winding of the selected phase and the first auxiliary winding of the selected phase are offset by about 60 to about 120 electrical degrees; and wherein the capacitors and windings are sized and configured to provide a power of the plurality of main windings that is at least 75% of a total power of the polyphase electric motor at 100% of a full load rating of the polyphase electric motor and the power of the plurality of main windings is motoring at 25% of the full load rating.