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Scaling and design of miniature high-speed bearingless slice motors

Skalierung und Auslegung von lagerlosen Miniatur-Scheibenläufermotoren für hohe Drehzahlen

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Abstract

Recent years have shown a development of electrical drive systems toward high rotational speeds to increase the power density. Applications such as optical systems benefit from rotational speeds at which conventional ball bearings suffer from high losses, excessive wear, and decreased reliability. In such cases, magnetic bearings offer an interesting alternative. This work presents a universally applicable design procedure for miniature bearingless slice motors intended for rotational speeds of several hundred thousand revolutions per minute. Design trade-offs are illustrated and facilitate the selection of Pareto-optimal implementations. An exemplary motor prototype for rotational speeds of up to 760 000 rpm with a rotor diameter of 4 mm and a suitable inverter featuring an FPGA-based controller are demonstrated briefly.

Zusammenfassung

Um die Leistungsdichte elektrischer Antriebssysteme zu erhöhen, existiert seit einigen Jahren ein Trend hin zu höheren Rotationsgeschwindigkeiten solcher Motoren. Anwendungen wie beispielsweise optische Systeme profitieren von hohen Rotationsgeschwindigkeiten, bei denen konventionelle Kugellager mit hohen Verlusten, überhöhtem Verschleiß und verringerter Zuverlässigkeit behaftet sind. In solchen Fällen bieten Magnetlager eine interessante Alternative. Die vorliegende Arbeit präsentiert einen universell einsetzbaren Designprozess für lagerlose Scheibenläufermotoren kleiner Baugröße, die für den Einsatz bei Drehzahlen von mehreren Hunderttausend Umdrehungen pro Minute vorgesehen sind. Eine Veranschaulichung der bei der Auslegung solcher Maschinen einzugehenden Kompromisse ermöglicht die Realisierung von Pareto-optimalen Designs. Ein beispielhafter Prototyp eines Motors für Drehzahlen von bis zu 760 000 U/min und einem Rotordurchmesser von 4 mm sowie ein geeigneter Umrichter mit FPGA-basierter Regelung werden kurz beschrieben.

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Acknowledgements

The authors thank the company Levitronix GmbH for supporting this work.

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  1. Power Electronic Systems Laboratory, ETH Zurich, Technoparkstrasse 1, 8005, Zurich, Switzerland

    Marcel Schuck, Pascal Puentener, Thomas Holenstein & Johann W. Kolar

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  1. Marcel Schuck
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  4. Johann W. Kolar
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Correspondence to Marcel Schuck.

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Schuck, M., Puentener, P., Holenstein, T. et al. Scaling and design of miniature high-speed bearingless slice motors. Elektrotech. Inftech. 136, 112–119 (2019). https://doi.org/10.1007/s00502-019-0718-8

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