MAGNETIC BEARING DEVICE AND MAGNETIC BEARING METHOD

WIPO Patent Application WO/2007/004656

A1

There are provided a magnetic bearing device and a magnetic bearing method capable of saving energy by eliminating bias current for linearization of the relationship between the magnetic force and the excitation current of an electromagnet. The magnetic bearing device supports a floating rotor (1) as a magnetic body at a predetermined position by a magnetic force of electromagnets (2, 3) in such a manner that the rotor (1) can rotate. The electromagnets (2, 3) oppose each other to sandwich the rotor (1). A driver (204) is of the PWM (pulse width modulation) type for controlling the excitation current of the electromagnets (2, 3) by modulating the pulse width of voltage driven by a predetermined carrier frequency fc. The driver (204) includes a resonant circuit electrically resonating with a frequency equivalent to the carrier frequency fc. When excitation current is fed to one of the electromagnets (2, 3) arranged to oppose each other, control is performed to make the excitation current of the other electromagnet is DC zero and voltage is applied via the resonant circuit to the electromagnet whose excitation current is DC zero.

BARADA TOSHIMITSU (JP)
YOSHIDA TOSHIYA (JP)

PCT/JP2006/313340

January 11, 2007

July 04, 2006

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EBARA CORP (JP)
BARADA TOSHIMITSU (JP)
YOSHIDA TOSHIYA (JP)

F16C32/04

JP2004132537A	2004-04-30
JPH06313426A	1994-11-08
JPH05118329A	1993-05-14
JPH0587140A	1993-04-06

See also references of EP 1903228A4
None

MIYAGAWA, Teiji et al. (Fuji Bldg. 19 Aizumi-ch, Shinjuku-ku Tokyo 05, JP)

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