Spindle motor

Details Spindle motor Spindle motor

1991-05-28

1992-07-28

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 277 80, 384133, H02K 714, H02K 708, F16J 1540, F16J 1516

Patent

active

051343312

ABSTRACT:
A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing means disposed on an outer side of the bearing means. The shaft member or bracket has a magnetized portion for suppressing a magnetic flux leaking from a magnetic fluid retaining means of the magnetic fluid sealing means.

REFERENCES:
patent: 4171818 (1979-10-01), Moskowitz et al.
patent: 4708350 (1987-11-01), Mizumoto et al.
patent: 4797013 (1989-01-01), Raj et al.
patent: 5009436 (1991-04-01), Endo et al.

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