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The design of a high speed bearingless drive shows special requirements concerning topology and loss minimization. This paper discusses the use of a bearingless disc motor for such a purpose. The effects of the selected geometric dimensions on the ability to produce passive and active bearing forces are studied in 3D-FEM simulations. Furthermore, a toroid winding, suitable for the chosen flat motor geometry, and an adequate 5-phase winding scheme are proposed. In an analytical part, the copper losses due to the motor and bearing currents, as well as due to the external rotor magnet field are calculated. The results lead to the selection of a preferable litz wire gauge which is finally used in the construction of a first motor prototype.

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Booktitle: Proceedings of ISMB12