Magnetic bearing device and magnetic bearing spindle device

Details Magnetic bearing device and magnetic bearing spindle device Magnetic bearing device and magnetic bearing spindle device

2008-04-03

2009-08-18

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C361S144000

Reexamination Certificate

active

07576463

ABSTRACT:
A control device includes a differential amplifying circuit for obtaining a difference between values of exciting currents (exciting voltage values) supplied to a pair of axial electromagnets and a pair of radial electromagnets, multiplying the obtained difference by coefficient times, and outputting it as the bearing load in an axial direction and a radial direction. The exciting current includes steady current supplied to the axial electromagnets and the radial electromagnets and control current which varies by the displacement of a main shaft. By supplying the steady current to the axial electromagnets and the radial electromagnets, the magnetic attraction force of the axial electromagnets and the radial electromagnets having non-linearity is linearly approximated. Accordingly, the difference between the values of the exciting currents (exciting voltages) supplied to a pair of electromagnets is obtained and is multiplied by coefficient times, thereby obtaining a value corresponding to the bearing load.

REFERENCES:
patent: 5562528 (1996-10-01), Ueyama et al.
patent: 5696412 (1997-12-01), Iannello
patent: 0674112 (1995-09-01), None
patent: 10-29101 (1998-02-01), None
patent: 11-22730 (1999-01-01), None
patent: 3135410 (2000-12-01), None

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