Radial force characteristics of multi-consequent-pole bearingless motor

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Conference Proceeding
Record of the IEEE International Conference on Electrical Machines and Systems, ICEMS, 2008, 2008, pp. 3644 - 3649
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Multi-consequent-pole bearingless motors can be used in low speed rotating and swinging stages (or platforms) under specific conditions. A test machine has been designed and built and in this machine two axes of freedom are actively controlled in the radial x-y directions. The suspension windings are of a novel toroidal shape, i.e., they are wound around the stator yoke. This produces a low axial length because the coil ends are compact. In the paper, a multi-consequent-pole rotor design is presented. The design procedure considered the leakage fluxes and magnetic saturation and used a three dimensional finite element analysis before the machine was constructed and tested. This paper proposes a novel structure for the suspension windings and the rotor. The suspension of the rotor was found to be successfully achieved and these characteristics are put forward in the paper.
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