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

1997-03-11

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 2114

Patent

active

056104634

ABSTRACT:
An apparatus for rotatably journaling a rotor of a spindle motor about a shaft comprising a plurality of annular ring multipole 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: 3233950 (1966-02-01), Baermann
patent: 4128280 (1978-12-01), Purtschert
patent: 4256352 (1981-03-01), Petrak et al.
patent: 5280208 (1994-01-01), Komura et al.

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