| 摘要 |
In a magnetic bearing apparatus, a rotating member having an axis of rotation along the horizontal direction is supported by a pair of radial magnetic bearings each including a plurality of electromagnets in the radial direction with clearances with the rotating member in two portions in the axial direction. The apparatus comprises a pair of position detecting sensors for detecting the displacement in the radial direction of the rotating member in the two positions in the axial direction of the rotating member and a control device for controlling magnetic attraction forces produced by the electromagnets on the basis of output signals from the respective sensors. The control device calculates the magnetic attraction force produced by each of the radial magnetic bearings on the basis of the output signal from each of the sensors, a value of a control current supplied to the electromagnets in the radial magnetic bearing, and an attraction force coefficient of the electromagnets in the radial magnetic bearing, to calculate the position of the center of gravity of the rotating member on the basis of comparison of the operated magnetic attraction forces.
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