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Inductive power transfer system with a rotary transformer for contactless energy transfer on rotating applications

: Ditze, S.; Endruschat, A.; Schriefer, T.; Rosskopf, A.; Heckel, T.


Sawan, M. ; IEEE Circuits and Systems Society:
ISCAS 2016, IEEE International Symposium on Circuits and Systems. Proceedings : Montreal, Canada
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-4799-5341-7
ISBN: 978-1-4799-5340-0
ISBN: 978-1-4799-5342-4
International Symposium on Circuits and Systems (ISCAS) <2016, Montréal>
Fraunhofer IISB ()

This paper examines an inductive power transfer (IPT) system with a rotary transformer as an alternative solution to slip ring systems for a contactless energy transfer to rotating equipment. A prototype system is set up, consisting of a rotating ball bearing shaft and an exemplary sensor circuit mounted on the shaft. Three possible transformer configurations are analyzed theoretically and experimentally regarding the self-inductance, the coupling factor and the losses in the litz wire. To utilize the intrinsic stray inductances of the rotary transformer, a series compensated resonant converter is implemented for the prototype system.