Patent ID: 8002086

Claim:
A magnetic guide apparatus comprising: a guide rail formed of a ferromagnetic body; a moving body which moves along the guide rail; a magnet unit which is disposed on a part of the moving body, which is opposed to the guide rail, and supports, by an action of magnetic force, the moving body in a state in which the moving body is out of contact with the guide rail; at least two gap sensors which are disposed with a predetermined interval in a direction of movement of the moving body, and detect a gap between the magnet unit and the guide rail; a signal correction unit which determines variation amounts of detection signals which are output from the gap sensors, relatively varies weight coefficients for the respective detection signals on the basis of the variation amounts, and outputs, as a signal for magnetic control, a signal which is obtained by adding the detection signals which are multiplied by the weight coefficients; and a control unit which controls the magnetic force of the magnet unit on the basis of the signal for magnetic control, which is output from the signal correction unit.