Abstract
Magnetic bearings are being increasingly used because of their noncontact support capability. For some applications, a power motor should be installed between the radial magnetic bearings. In the previous paper, a new method of levitation control of a synchronous-type motor as introduced, that is, the radial position as well as the rotation of a PM rotor can be controlled. For analysis the rotor was assumed to have a sinusoidally distributed magnetic flux, while the stator had an arbitrarily distributed flux. In the experiment, the stator was approximated by 12 concentrated windings. This paper introduces the analysis of the least number of stator poles. The stator flux is assumed to be produced by the concentrated windings which produce the spatial higher harmonics. The rotor is assumed to have the sinusoidal distributed flux which can be produced by a permanent magnet. A simple experiment is conducted to confirm the validity of the analysis.
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