MAGNETIC BEARING DEVICE INTEGRAL WITH MOTOR

WIPO Patent Application WO/2008/015776

A1

A bearing device integral with a motor, in which long term durability of a rolling bearing against thrust load is increased and in which a main shaft can be rotated at high speed. Problems of assembly arising from the structure of the device using two thrust plates are solved without creating problems of insufficient strength in high-speed rotation. The bearing device integral with a motor simultaneously uses rolling bearings (15, 16) and a magnetic bearing. The rolling bearings (15, 16) support a radial load and the magnetic bearing supports either or both an axial load and a bearing preload. An electromagnet unit (17) forming the magnetic bearing is installed in a spindle housing (14) so as to face, without contact, thrust plates (13a, 13b) arranged on a main shaft (13). The thrust plates (13a, 13b) are two plates separated in the axial direction and each have an electromagnet target on one side and a permanent magnet (28aa) for a motor rotor (28a) on the other side. A motor stator (28b) is placed sandwiched by the permanent magnets (28aa). A motor (28) is an axial gap-type coreless. The main shaft (13) is split into two, between the two thrust plates (13a, 13b), and both main shaft split bodies are joined together.

SUZUKI NOBUYUKI (JP)

PCT/JP2007/000766

February 07, 2008

July 13, 2007

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NTN TOYO BEARING CO LTD (JP)
SUZUKI NOBUYUKI (JP)

F16C32/00; F16C25/08; F16C32/04; F25B9/00; F25B11/02; H02K5/16; H02K5/173; H02K7/09

JPH0791760A	1995-04-04
JPH08261237A	1996-10-08
JP2007162727A	2007-06-28
JPH06101498A	1994-04-12

SUGIMOTO, Shuji et al. (10-2 Edobori 1-chome, Nishi-ku, Osaka-sh, Osaka 02, JP)

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