Spindle motor having magnetic bearing

Details Spindle motor having magnetic bearing Spindle motor having magnetic bearing

1996-08-06

1998-07-21

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 709

Patent

active

057838860

ABSTRACT:
The invention relates to a structure of a spindle motor. The spindle motor comprises a housing assembly having a cylindrical hub and a stator secured onto a circumferential outer surface of the cylindrical hub, a spindle hub having a rotor magnet secured onto a circumferential inner surface thereof, a rotating shaft passing through the spindle hub and extending into space defined in the cylindrical hub, a plurality of first permanent magnets fitted onto a circumferential outer surface of the rotating shaft and having opposed magnetic polarities in upper and lower direction, and a plurality of second permanent magnets fitted onto a circumferential inner surface of the cylindrical hub and having opposed magnetic polarities in upper and lower direction, whereby the rotating shaft can be rotated without any frictional contact, in a state being floated by magnetic repulsion and attraction induced by the first and second permanent magnets.

REFERENCES:
patent: 3614181 (1971-10-01), Meeks
patent: 4379598 (1983-04-01), Goldowsky
patent: 4451811 (1984-05-01), Hoffman
patent: 4999533 (1991-03-01), King et al.
patent: 5089732 (1992-02-01), Konno et al.
patent: 5140208 (1992-08-01), Tozoni
patent: 5321329 (1994-06-01), Horvorka
patent: 5559382 (1996-09-01), Oku et al.
patent: 5574322 (1996-11-01), Nii et al.

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