Spindle motor

Details Spindle motor Spindle motor

1995-09-20

1996-11-05

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 44, 310 67R, 310 88, H02K 500

Patent

active

055720781

ABSTRACT:
A motor, such as a spindle motor, and a method for making such motor, wherein the motor has a stationary part, a rotary part mounted on the stationary part rotatably with respect thereto by a bearing and a magnetic fluid seal mechanism interposed in a radial gap between the stationary part and the rotary part is disclosed. The magnetic fluid seal; mechanism comprises a magnetic ring mounted on the stationary part, a ringlike magnet unit mounted on the rotary part and a magnetic fluid held in a gap between the ringlike magnet unit and the magnetic ring. The magnetic ring is made of a sintered metal made by baking a magnetic metal powder. At last the outer peripheral surface of the magnetic ring is preferably treated with a water-repelling treatment which includes impregnation with resin. All of the surfaces of the magnetic ring are non-cut surfaces.

REFERENCES:
patent: 5047677 (1991-09-01), Mineta
patent: 5281886 (1994-01-01), Ohta
patent: 5325004 (1994-06-01), Mori et al.
patent: 5402023 (1995-03-01), Nakanishi et al.
patent: 5483113 (1996-01-01), Sakuragi et al.

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