Back to results
US 2001/0030475 A1Published application
Induction motor driven seal-less pump
AssigneeGeneral Electric Company
InventorsGerald Burt Kliman, Roger Neal Johnson
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGeneral Electric Company
InventorsGerald Burt Kliman, Roger Neal Johnson
Estimating the term…
A seal-less pump and electric motor assembly includes a motor rotor fixed to a driving shaft connected to an impeller in the pump assembly. The rotor and impeller are enclosed in a common housing such that the rotor rotates within any fluid being pumped by the impeller. The portion of the housing circumscribing the rotor includes a plurality of axially extending, circumferentially spaced strips of magnetic material penetrating through plastic material of the housing. Each of the strips coincide with corresponding ones of the pole teeth of a motor stator circumscribing the outer portion of the housing such that the strips in the housing act as extensions of the pole teeth. In one embodiment, the strips of magnetic material in the housing are formed by molding powdered iron in a plastic binder material. The strips are then placed in a mold in which the housing is formed by injecting plastic. The plastic binder in the strips melds with the injected plastic to form a continuous housing for enclosing the rotor. The ferromagnetic material strips extend through the housing and are spaced from the rotor surface by a normal air gap distance so as to improve the efficiency of the motor by having the magnetic strip act as extensions of the motor stator pole teeth. In one embodiment, the rotor includes a shaft, a core-including a molded magnetic powder and plastic composite material surrounding the shaft, and an annular corrosion resistant electrically conductive tube surrounding the core.
An electric motor and pump assembly comprising:
An electric motor driven pump assembly in which the pump includes an impeller coupled directly to a rotor of the motor with the rotor and impeller exposed to a fluid and the motor stator being isolated from the fluid by a plastic pump housing segment circumscribing the motor rotor, the stator being characterized by a plurality of radially inward extending pole teeth electrically and mechanically engaging corresponding ones of a plurality of strips of electrically conductive material formed by combining powdered iron in a plastic matrix, the strips being embedded in the plastic pump housing segment.
A method of fabricating a component of a motor-pump combination comprising the steps of:
A method of fabricating a motor-pump combination with the motor thereof having a stator, the stator including a pair of generally opposite end faces, a plurality of teeth extending between the opposite end faces, and a plurality of tooth tips on the teeth defining in part a generally axial bore between the opposite end faces, respectively, the method comprising the steps of:
A rotor for use in a seal-less pump and electric motor assembly, the rotor comprising:
A method of fabricating a rotor comprising the steps of:
Dependencies are inferred from the claim text.