The control system of a magnetic bearing system using forces of repulsion between permanent magnets was designed on a state-feedback basis. In the treated magnetic bearing, the radial motions of the rotor were passively supported by repulsive forces and the axial motion was stabilized by active control. Stabilization was achieved by using the motion control of the permanent magnets for passive radial suspension; these magnets were driven by voice coil motors in the axial direction. Experimental results showed that the designed controllers achieved contactless levitation and adjusted the levitation characteristics effectively by the assignment of closed-loop poles.

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