Patent ID: 7402932

Claim:
A three phase induction motor comprising: a motor housing comprising a cylindrical shell, a top flange and a bottom flange; a shaft axially disposed within the cylindrical shell and extending through the top flange; a rotor attached to the shaft and disposed between the top flange and the bottom flange, the rotor comprising a top fan attached to a top of the rotor and a bottom fan attached to a bottom of the rotor to create an air flow within the motor housing, a center plate disposed between an upper set and a lower set of radius extenders wherein the center plate, the upper set of radius extenders and the lower set of radius extenders contain openings to allow the air flow to pass through the rotor, an upper set of permanent magnets attached along a perimeter of the upper set of radius extenders and a lower set of permanent magnets attached along a perimeter of the lower set of radius extenders; and a three phase stator mounted to the interior of the cylindrical shell facing the upper and lower sets of permanent magnets and separated from the upper and lower sets of permanent magnets by an air gap, the stator comprising a core structure of magnetically conductive material having a set of slots arranged on an internal face of the core structure and one or more sets of coils disposed within the slots.