Patent ID: 8129872
Filing Date: 2012-03-06
Classification: F04D,H02K,Y10T

Abstract:
1. An impeller mechanism incorporating a brushless dc motor comprising: a molded housing defining an internal axis of rotation and a lower portion of a peripheral volute; a stator assembly integrally molded within a base portion of the housing in an annular region between the axis and the volute, wherein the stator assembly includes a plurality of radially extending teeth arranged in a circle which is concentric to the internal axis, wherein the stator assembly also includes a respective electrical winding about the teeth; a hollow bearing support concentric with the internal axis and extending through the stator assembly towards an interior of the housing; a brushless rotor assembly including a plurality of radially oriented permanently magnetized poles in a circle, the rotor assembly proximate and concentric to the magnetizable teeth of the stator assembly; a cylindrical air gap concentric with the internal axis and extending radially between the rotor assembly and the stator assembly, a hat-shaped rotor support disposed about the internal axis and above the stator assembly, an impeller assembly disposed on a side of the rotor support, the impeller assembly includes a front side having a central air inlet and an impeller vane extending towards a circumference of the impeller assembly from the center air inlet, and a back side having a recess into which extends at least a portion of the stator assembly; a rotating shaft concentric with said internal axis and extending from an interior portion of the hollow bearing support to the hat-shaped rotor support, and a bearing assembly between an interior surface of the hollow bearing support and an outer surface of the rotating shaft, wherein the bearing assembly includes a first bearing and a second bearing which are coaxial to and rotatably support the rotating shaft, the first bearing is entirely above a first plane and the impeller vane is entirely below the first plane, and a second plane extends through the second bearing and the winding of the stator assembly.