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In this work, the control of the levitation of a ferromagnetic object by using a planar magnetic bearing has been proposed and simulated. Such control is based on the correction of the magnetic force applied on the object as a function of its displacement by the action on the supplying current of the magnetic bearing. To achieve a control that permits a quick reaching of the desired object equilibrium position and to take into account the mass disturbance, the sliding mode control (SMC) method has been applied. To permit the correction of the dc supplying current, the bearing is energized by a four quadrants chopper.