Dynamic pressure bearing device

Details Dynamic pressure bearing device Dynamic pressure bearing device

1994-09-20

1998-05-26

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

384446, H02K 516, F16C 1900

Patent

active

057570973

ABSTRACT:
The invention is intended to facilitate surface processing for generation of dynamic pressure and to prevent degradation of the bearing performance due to temperature changes. To this end, a shaft is composed of an axially magnetized magnet and shafts of magnetic material holding the magnet therebetween. The shaft is press-fitted in an insertion hole in a non-magnetic sleeve. Pole pieces are placed on the upper and lower edges of a hole in a motor hub. Clearances defined by the outer peripheral surface of the sleeve and the inner peripheral surface of the motor hub are filled with a magnetic fluid. In order to generate a dynamic pressure in the magnetic fluid, surface processing is applied not to the magnet but to the outer peripheral surface of the sleeve. Further, the thermal expansion coefficient of the sleeve is greater than that of the motor hub.

REFERENCES:
patent: 3851933 (1974-12-01), Jacobson
patent: 4630943 (1986-12-01), Stahl et al.
patent: 4694213 (1987-09-01), Gowda et al.
patent: 5323076 (1994-06-01), Hajec
patent: 5325066 (1994-06-01), Uno et al.
patent: 5367416 (1994-11-01), Cossette et al.
patent: 5372432 (1994-12-01), Ishikawa

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