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1. (WO1987003347) ELECTRIC MOTOR WITH FERROFLUID BEARING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1987/003347 International Application No.: PCT/US1986/002473
Publication Date: 04.06.1987 International Filing Date: 20.11.1986
IPC:
F16C 33/10 (2006.01) ,H02K 5/167 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
C
SHAFTS; FLEXIBLE SHAFTS; MECHANICAL MEANS FOR TRANSMITTING MOVEMENT IN A FLEXIBLE SHEATHING; ELEMENTS OF CRANKSHAFT MECHANISMS; PIVOTS; PIVOTAL CONNECTIONS; ROTARY ENGINEERING ELEMENTS OTHER THAN GEARING, COUPLING, CLUTCH OR BRAKE ELEMENTS; BEARINGS
33
Parts of bearings; Special methods for making bearings or parts thereof
02
Parts of sliding-contact bearings
04
Brasses; Bushes; Linings
06
Sliding surface mainly made of metal
10
Construction relative to lubrication
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
K
DYNAMO-ELECTRIC MACHINES
5
Casings; Enclosures; Supports
04
Casings or enclosures characterised by the shape, form, or construction thereof
16
Means for supporting bearings, e.g. insulating support, means for fitting the bearing in the bearing-shield
167
using sliding-contact or spherical cap bearings
Applicants:
HAJEC, Chester, S. [US/US]; US
Inventors:
HAJEC, Chester, S.; US
Agent:
FAIRBAIRN, David, R. @; Kinney & Lange Suite 1500 625 Fourth Avenue South Minneapolis, MN 55415-1659, US
Priority Data:
830,35020.11.1985US
Title (EN) ELECTRIC MOTOR WITH FERROFLUID BEARING
(FR) MOTEUR ELECTRIQUE AVEC PALIER FERROFLUIDE
Abstract:
(EN) An electric motor (50) including an integral ferrofluid bearing provides significant reduction in non-repeatable runout, stray flux, and audible noise over conventional motors using ball bearings. The motor (50) includes a hub (54) and a base (52), with the base (52) attached to a tapered magnetically permeable shaft (58) which defines an inner bearing race, and the hub (54) attached to an internally tapered, magnetically permeable sleeve (78) which defines an outer bearing race. Permanent magnets (108) surround and are rotatable with the sleeve (78) to provide magnetic fields which interact with the stator winding (110A-110B) to cause rotation of the hub (54) and sleeve (78). In addition, the permanent magnets (108) form magnetic flux paths with the shaft (58) and the sleeve (78) to maintain ferrofluid lubricant between the inner and outer bearing races.
(FR) Un moteur électrique (50) ayant un palier ferrofluide intégral permet d'obtenir une réduction significative de l'usure, du flux de dispersion et du bruit perceptible par rapport aux moteurs conventionnels utilisant des paliers à billes. Le moteur (50) comprend un moyeu (54) et une base (52) laquelle est fixée à un arbre conique à perméabilité magnétique (58) qui définit une cage de palier intérieure, et le moyeu (54) est fixé à un manchon intérieurement conique, à perméabilité magnétique (78) qui définit une cage de palier extérieure. Des aimants permanents (108) entourent le manchon (78) et peuvent tourner avec ce dernier pour créer des champs magnétiques qui ont une interaction avec l'enroulement du stator (110A-110B) pour provoquer la rotation du moyeu (54) et du manchon (78). De plus, les aimants permanents (108) forment des chemins de flux magnétiques avec l'arbre (58) et le manchon (78) pour maintenir le lubrifiant ferrofluide entre les cages de palier interne et externe.
Designated States: JP
European Patent Office (AT, BE, CH, DE, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)