Spindle motor and magnetic fluid seal apparatus used therefor

Details Spindle motor and magnetic fluid seal apparatus used therefor Spindle motor and magnetic fluid seal apparatus used therefor

1993-08-04

1995-03-28

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, H02K 714, H02K 708

Patent

active

054020239

ABSTRACT:
A spindle motor comprising a stationary member, a hub rotatably supported on the stationary member via a pair of bearing members, and a magnetic fluid seal disposed outwardly of at least one of the pair of bearing members. A passageway or conduit hole is provided to conduct between an annular space separated by the stationary member, the magnetic fluid seal means, the rotor and the other of the bearing member and the inside of the motor. Furthermore, a magnetic fluid holder in the magnetic fluid seal is provided.

REFERENCES:
patent: 4843500 (1989-06-01), Elsasser et al.
patent: 4953414 (1990-09-01), Ueno et al.
patent: 5001581 (1991-03-01), Elsasser
patent: 5006943 (1991-04-01), Elsasser
patent: 5009436 (1991-04-01), Endo et al.
patent: 5047677 (1991-09-01), Mineta et al.

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