Patent ID: 7929268

Claim:
A magnetic levitation apparatus comprising: a guide constituted of a ferromagnetic member; a magnet unit which is opposed to the guide via a gap and constituted of an electromagnet and a permanent magnet, both forming a magnetic path in the gap; a levitation body supported without any contact by an attraction force of the magnet unit acting on the guide; a current value detecting portion which detects a current flowing through the coil of the electromagnet; a gap sensor which detects a gap length when the levitation body is levitated; a first exciting voltage arithmetic portion which calculates an exciting voltage to be applied to the electromagnet based on a coil current value detected by the current value detecting portion; a second exciting voltage arithmetic portion which calculates an exciting voltage to be applied to the electromagnet based on a gap length detected by the gap sensor; and an exciting voltage adjusting portion which mixes an output value of the first exciting voltage arithmetic portion and an output value of the second exciting voltage arithmetic portion so as to generate and output an exciting voltage necessary for the levitation control of the levitation body and adjusts the mixing ratio corresponding to the gap length.