Integrated passive magnetic bearing system and spindle permanent

Details Integrated passive magnetic bearing system and spindle permanent Integrated passive magnetic bearing system and spindle permanent

1994-02-25

1996-10-01

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 310 90, H02K 714, H02K 709

Patent

active

055613357

ABSTRACT:
An apparatus for rotatably journaling a rotor of a spindle motor about a stator comprising a plurality of magnetic bearings for use in a disc drive including an annular ring single-pole magnet which is integral with the spindle permanent magnet of a spindle motor rotor assembly and disposed in opposition to a complementary annular magnet ring attached to the stator assembly of the spindle motor. These magnetic bearings in conjunction with an axial pivot form a radially stable bearing system for maintaining rotor displacement about the stator in conjunction with a conventional axial pivot. The present invention provides for the unique combination of magnetic bearings with other conventional pivots for use in disc drive systems.

REFERENCES:
patent: 3146038 (1964-08-01), Lautzenhiser
patent: 3233950 (1966-02-01), Baermann
patent: 4211452 (1980-07-01), Poubeau
patent: 4471331 (1984-09-01), Swider
patent: 5126610 (1992-06-01), Fremerey
patent: 5168186 (1992-12-01), Yashiro
patent: 5177387 (1993-01-01), McMichael et al.
patent: 5223758 (1993-06-01), Kataoka et al.
patent: 5280208 (1994-01-01), Komura et al.
patent: 5325006 (1994-06-01), Uno et al.
"Magnetic Bearing Concepts for Turbomolecular Pumps" by Dantam K. Rao, Precision Magnetic Bearing Systems, Technical Bulletin No. C-1022, Jun. 1993.

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