Patent ID: 6012909
Filing Date: 2000-01-11
Classification: F04D,H02K

Abstract:
An axial-field integral-motor pump, comprising:a housing assembly having a working fluid inlet, a working fluid discharge, and a stationary shaft mounted therein;a motor stator mounted in said housing assembly radially surrounding said stationary shaft and having means for sealing to prevent exposure to said working fluid;a motor rotor axially spaced from said stator and fixed to an impeller having a hub and journaled, by a bearing fixed in said hub, on said stationary shaft within said housing assembly, said rotor having means for sealing to prevent exposure to said working fluid;an axial passageway formed within said stationary shaft; anda first means for conducting working fluid from said working fluid discharge, along sealed surfaces of said rotor and said stator, to said axial passageway within said stationary shaft, to said working fluid inlet.