Apparatus for electrically grounding a rotor hub in a disc drive

Details Apparatus for electrically grounding a rotor hub in a disc drive Apparatus for electrically grounding a rotor hub in a disc drive

1994-06-03

1995-12-05

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 1702

Patent

active

054734843

ABSTRACT:
A disc drive includes a disc drive motor for rotating a storage disc. The motor includes a motor base having a fixed member. A rotor is rotatably coupled to the fixed member and carries the storage disc. First and second bearings are positioned between the rotor and the fixed member allowing rotation of the rotor about the fixed member. A permanent magnet is positioned between the first and second bearings. A conductive fluid between the rotor and the fixed member is maintained in operable contact with the rotor and the fixed member by the permanent magnet. The ferrofluid provides a low resistance electrical path between the rotor and the fixed member thereby electrically grounding the rotor to the motor base.

REFERENCES:
patent: 4673997 (1987-06-01), Gowda et al.
patent: 4779165 (1988-10-01), Elsaesser et al.
patent: 5011165 (1991-04-01), Cap
patent: 5140479 (1992-08-01), Elsing et al.
patent: 5267737 (1993-12-01), Cossette et al.
patent: 5367416 (1994-11-01), Cossette et al.

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