Title:
MOTOR-INTEGRATED MAGNETIC BEARING DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/018169
Kind Code:
A1
Abstract:
A motor-integrated magnetic bearing device which can be stably controlled even
if a motor is operated under a high load and an excessive axial load acts on the motor,
in which the structure of a controller is simplified, and in which a main shaft
can be rotated at high speed with production of heat in the motor suppressed. In
the magnetic bearing device, rolling bearings (15, 16) are used along with a magnetic
bearing. The rolling bearings (15, 16) support a radial load, and the magnetic
bearing supports either of an axial load and a bearing preload or both of them.
The electromagnet unit (17) of the magnetic bearing is attached to a spindle
housing (14) without contact so as to face ferromagnetic substance-made flange-like
thrust plates (13a, 13b) formed on the main shaft (13). Permanent magnets (28aa)
for the motor rotor are disposed on opposed surfaces of two thrust plates (13a,
13b). A motor stator (28b) is disposed sandwiched between the permanent magnets
(28aa) and attached to the spindle housing (14). Further, the controller (19)
is provided on the magnetic bearing device, and the controller controls the electromagnet
unit (17) according to the output of a sensor (18) for detecting an axial force.
The inner diameter of the outer diameter side coil end of a coil (28ba) of the motor
stator (28b) is equal to or less than the outer diameter of the permanent magnets
(28aa).
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Inventors:
OZAKI TAKAYOSHI (JP)
SUZUKI KENICHI (JP)
SUZUKI KENICHI (JP)
Application Number:
PCT/JP2007/000827
Publication Date:
February 14, 2008
Filing Date:
August 01, 2007
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
OZAKI TAKAYOSHI (JP)
SUZUKI KENICHI (JP)
OZAKI TAKAYOSHI (JP)
SUZUKI KENICHI (JP)
International Classes:
F16C32/00; F16C32/04; F25B9/00; H02K7/09
Foreign References:
| JPH0791760A | 1995-04-04 | |||
| JPH08261237A | 1996-10-08 | |||
| JP2007162727A | 2007-06-28 | |||
| JPH06101498A | 1994-04-12 |
Attorney, Agent or Firm:
SUGIMOTO, Shuji et al. (10-2 Edobori 1-chome,Nishi-ku, Osaka-sh, Osaka 02, JP)
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