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 c/o Mitsubishi Denki Kabushiki Kaisha (2-3 Marunouchi 2-chom, Chiyoda-ku Tokyo, 100-8310, JP)
Application Number:
PCT/JP2002/007109
Publication Date:
January 22, 2004
Filing Date:
July 12, 2002
Export Citation:
Assignee:
MITSUBISHI DENKI KABUSHIKI KAISHA (2-3 Marunouchi 2-chome, Chiyoda-ku, Tokyo, 100-8310, JP)
Shimada, Akihiro c/o Mitsubishi Denki Kabushiki Kaisha (2-3 Marunouchi 2-chom, Chiyoda-ku Tokyo, 100-8310, JP)
Shimada, Akihiro c/o Mitsubishi Denki Kabushiki Kaisha (2-3 Marunouchi 2-chom, Chiyoda-ku Tokyo, 100-8310, 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
Attorney, Agent or Firm:
Sakai, Hiroaki (Tokyo Club Building, 2-6 Kasumigaseki 3-chom, Chiyoda-ku Tokyo, 100-0013, JP)