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50- \hbox {N}\cdot\hbox {m} /2500-W Bearingless Motor for High-Purity Pharmaceutical Mixing

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4 Author(s)
Warberger, B. ; Power Electron. Syst. Lab., ETH Zurich, Zurich, Switzerland ; Kaelin, R. ; Nussbaumer, T. ; Kolar, J.W.

In this paper, a novel bearingless motor (50 N·m /2.5 kW) for high-purity mixing applications is presented. The motor consists of a stator with concentrated windings and an exterior rotor with permanent magnets. The rotor is propelled and spatially suspended only by means of magnetic fields. This paper deals with the functionality and the mechanical setup of the new motor. Thereby, the optimization of the motor design is presented in detail. In order to evaluate the load of the bearingless motor in mixing operation, a fluid simulation is set up. Moreover, after the identification of the losses, a thermal simulation is established in order to predict the temperature distribution within the motor. Finally, a functional model is built up to verify the results.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 5 )

Date of Publication:

May 2012

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