Patent ID: 7911175

Claim:
A two speed, single phase induction motor having a 2-pole high speed mode and 4-pole low speed mode, said motor comprising: a rotor assembly; a core comprising a stack of laminations forming slots and forming a central bore for receiving the rotor assembly; a main winding positioned within the slots of the core; an auxiliary winding comprising: a tapped 2-pole auxiliary winding having a first portion and a second portion; a 4-pole auxiliary winding; and a switch adapted to be connected to a power supply, said switch connected to the windings for selectively energizing the windings, said switch configured to energize at least a portion of the auxiliary winding during start-up of the high speed mode and during start-up of low speed mode, said switch configured to energize at least a portion of the main winding during running in the high-speed mode and during running in the low speed mode, and said switch configured to energize the first portion of the tapped 2-pole auxiliary winding during running in the low speed mode thereby increasing the overall content of magnet wire energized during running in the low speed.