Abstract
For discoidal or annular rotors, a magnetic suspension made only with one passive axial bearing and one active radial bearing is very well adapted. This suspension is relatively simple, and can operate without any additional damping system. A flywheel prototype has been built to test this magnetic suspension. The rotor is a 300-mm-diam aluminum disk (7.3 kg weight) rotating at 9000 rpm. In operation, the crossing of the different critical frequencies occurs without any problem, because the only one excited mode (cylindrical motion) is actively controlled, and the others which are passively stabilized (axial and conical modes) are not excited.
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