Passive magnetic bearings for a spindle motor

Details Passive magnetic bearings for a spindle motor Passive magnetic bearings for a spindle motor

1995-06-02

1996-11-26

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

F16C 3906, H02K 2114

Patent

active

055788823

ABSTRACT:
An apparatus for rotatably journaling a rotor of a spindle motor about a shaft comprising a plurality of annular ring multi-pole magnets, each ring comprised of a plurality of axially aligned magnets whose polarity is alternated along the radius of the ring. The annular ring multi-pole magnets are disposed on both the rotor and stator of a spindle motor in opposition in attraction mode, or a complete offset repulsion mode with like poles facing one another with an full offset, thereby forming a radially stable magnetic bearing for maintaining rotor displacement about a shaft in conjunction with a conventional axial pivot.

REFERENCES:
patent: 2203411 (1940-06-01), Green
patent: 3243238 (1966-03-01), Lyman
patent: 3934950 (1976-01-01), Kuhlmann
patent: 4211452 (1980-07-01), Poubeau
patent: 5043615 (1991-08-01), Oshima
patent: 5126610 (1992-06-01), Fremerey
patent: 5182533 (1993-01-01), Ritts
patent: 5391952 (1995-02-01), Simazu
"Precision Magnetic Bearing Systems" D. K. Rao, Tech. Bulletin No. C-1022, Jun. 1993.

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