Inductive Ball-Bearing

The ability to transfer power in small moving systems is required for a wide range of applications such as wind power systems with electronics integrated in the rotor blades or highly-automated Industry 4.0 production platforms. The goal of the project is to develop a technology for the contactless transfer of power and data in small moving components in harsh environments.

Project Targets

Realization of an inductive energy transfer for fast-moving components

Transmission power up to 20 W

Wireless communication of information as well as higher data rates for the transmission of sensor & actuator information



Exceptionally high level of integration of the coupling coils

Realization of a rotating transformer with metal parts in the surrounding

High mechanical requirements



Demonstration of the functionality inside a rotating application (ball-bearing with shaft)

Practical robustness tests & simulations of electronic assemblies beyond the normative measuring range

Near field transmission at high frequencies including alternative capacitive transmission systems with differential directional coupler

High-quality digital modulation and thermoelectric optimization of the crossover

Project Partners

Research project in cooperation with the Chair of Electron Devices (LEB) and further chairs of the University of Erlangen-Nürnberg

Fraunhofer Institute for Integrated Circuits IIS









Ditze, S., Endruschat, A., Schriefer, T. Rosskopf, A., Heckel, T., Inductive Power Transfer System with a Rotary Transformer for Contactless Energy Transfer on Rotating Applications, 2016 IEEE International Symposium on Circuits and Systems (ISCAS), Montreal, Quebec, Kanada 2016



Gerstner H., Inductive Energy and Data Transmission in Novel Industrial Applications, Embedded Platforms Conference Munich, 10. November 2016