Title:
MAGNETIC BEARING SPINDLE
Document Type and Number:
WIPO Patent Application WO/2004/007982
Kind Code:
A1
Abstract:
A magnetic bearing spindle, comprising a radial magnetic bearing rotor (2) formed by stacking ring−shaped punched plates formed of flat rolled magnetic steel sheet, an axial magnetic bearing rotor (3) formed of magnetic material, and a spindle motor rotor (4) fixed to a rotating shaft (1) and a plurality of electromagnets disposed at minute intervals around the rotating shaft (1), wherein a cooling air inlet (24) is formed in an anti−load side bracket (17), an air passing route (25) is formed in a frame (15), a triangular part (11) is provided on the outer diameter part of the axial magnetic bearing rotor (3), radial through−holes (13) are provided at equal intervals in the outer diameter part of a collar (12) for the axial positioning of an axial magnetic bearing stator (6), and cooling air is fed through the through−holes (13), whereby the variation rate of a pipeline resistance when the cooling air passes therethrough can be reduced, and the rotating shaft (1) and the axial magnetic bearing stator (6) can be cooled efficiently.
Inventors:
SHIMADA AKIHIRO (JP)
Application Number:
PCT/JP2002/007109
Publication Date:
January 22, 2004
Filing Date:
July 12, 2002
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
SHIMADA AKIHIRO (JP)
SHIMADA AKIHIRO (JP)
International Classes:
B23Q1/70; B23Q5/10; B23Q11/12; F16C37/00; F16C39/06; H02K1/32; H02K7/09; H02K9/06; (IPC1-7): F16C32/04; B23Q11/12; B23Q1/70
Foreign References:
| JPH0861366A | 1996-03-08 | |||
| JPH09133133A | 1997-05-20 | |||
| US4935654A | 1990-06-19 | |||
| JPH0571533A | 1993-03-23 | |||
| US5804900A | 1998-09-08 | |||
| JPH0253516U | 1990-04-18 |
Other References:
See also references of EP 1522749A4
Attorney, Agent or Firm:
Sakai, Hiroaki (2-6 Kasumigaseki 3-chom, Chiyoda-ku Tokyo, JP)
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