Spindle motor

Details Spindle motor Spindle motor

1990-09-24

1991-10-29

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 310 90, H02K 524

Patent

active

050618687

ABSTRACT:
A spindle motor comprising a fixed shaft member, a hub member rotatably supported by the fixed shaft member through bearings, and a magnetic-fluid type sealing mechanism arranged between the fixed shaft member and the hub member. The magnetic-fluid type sealing mechanism has a rotary member mounted on the hub member, a stationary member mounted on the fixed shaft member, and a magnetic fluid holding device for holding a magnetic fluid. The magnetic fluid holding is secured to the annular mounting portion of the stationary member. The magnetic fluid holding device and the annular portion of the rotary member cooperate with each other in holding the magnetic fluid therebetween. The fixed shaft member has an axially extending locating recess or projection, while the stator and the circuit assembly have locating projections or recesses for cooperation with the locating recess or projection of the fixed shaft member so as to set the stator and the circuit assembly in a predetermined angular positional relationship to each other. The fixed shaft member is provided with a stopper projection, and an urging device for urging the stator and the circuit assembly towards the stopper projection is provided, so that the stator and the circuit assembly are held at predetermined axial positions on the fixed shaft member by cooperation between the stopper projection and the urging means.

REFERENCES:
patent: 4519010 (1985-05-01), Elsaesser et al.
patent: 4647803 (1987-03-01), von der Heide et al.
patent: 4800309 (1989-01-01), Lakin
patent: 4814652 (1989-03-01), Wright
patent: 4817964 (1989-04-01), Black, Jr.
patent: 4818907 (1989-04-01), Shirotori

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