Importance

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Abstract

A magnetic bearing apparatus comprises a first magnetic bearing for levitating a rotary body by magnetic attraction forces in an axial direction thereof and a second magnetic bearing for levitating the rotary body by magnetic attraction forces in a radial direction thereof. A first detecting device detects axial displacement of the rotary body and outputs a first detection signal corresponding to the detected axial displacement of the rotary body. A second detecting device detects radial displacement of the rotary body and outputs second detection signals corresponding to the detected radial displacement of the rotary body. A first A/D conversion device converts the first detection signal to a first digital signal at a first conversion speed. A second A/D conversion device converts the second detection signals to second digital signals at a second conversion speed different from the first conversion speed. A calculating device calculates control currents on the basis of the first and second digital signals for controlling the axial and radial direction electromagnets to levitate the rotor in the axial and radial directions at a preselected target position.

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First Claim