Spindle motor having air dynamic pressure bearing and rotating d

Details Spindle motor having air dynamic pressure bearing and rotating d Spindle motor having air dynamic pressure bearing and rotating d

1999-03-03

2000-10-03

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

384110, H02G 516

Patent

active

061277568

ABSTRACT:
A spindle motor has a rotor, a stator and an air dynamic pressure bearing for supporting the rotor for rotation about a rotational axis relative to the stator. The air dynamic pressure bearing comprises a first dynamic pressure bearing portion and a second dynamic pressure bearing portion. The first dynamic pressure bearing portion comprises a convex side bearing member having a conical convex portion, a concave side bearing member having a conical concave portion receiving the conical convex portion, and dynamic pressure generating grooves formed on one of a surface of the conical convex portion and a surface of the conical concave portion. The second dynamic pressure bearing portion comprises a shaft having a first end fixed to the concave side bearing member and extending along the rotational axis, a bore formed in the convex side bearing member for receiving a second end of the shaft to permit rotation of the convex side bearing member relative to the concave side bearing member about the shaft, and dynamic pressure grooves formed on one of an outer circumferential surface of the shaft and an inner circumferential surface of the bore.

REFERENCES:
patent: 3934950 (1976-01-01), Kuhlmann
patent: 4805972 (1989-02-01), Tanaka et al.
patent: 5541460 (1996-07-01), Dunfield et al.
patent: 5689146 (1997-11-01), Cheever
patent: 5762422 (1998-06-01), Suzuki et al.
patent: 5855437 (1999-01-01), Lee
patent: 5873657 (1999-01-01), Lee

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