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Innovation Planets Parts

JEC World


GFRP hollow rotor shaft for electric motor

UNIVERSITY OF STUTTGART / Institute of aircraft design
The GFRP hollow rotor shaft was manufactured using the braiding process. A radial braiding maschine frome Herzog GmbH with 176 carries was set up with E-Glass fibres (EC14 300 TD44, Vetrotex) to manufacture the preform containing 16 layers. SIKA Biresin CR172 resin system was used in an vacuum resin infusion process to form the part. Subsequently, the assembly and integration of the WPT was done.

Why and Whom

In order to reduce dependence on rare earths, we rely on the inductive electrically excited syncronous machine (iEESM), a system with wireless power transfer (WPT). To optimize the WPT system, we designed an built a GFRP hollow rotor shaft for the iEESM to house the entire system of inductive spools, power electronics and cooling system. The GFRP shaft does't interfere with the inductive WPT.

Partners

Institute of Electrical Energy Conversion, University of Stuttgart | Institute of Product Engineering, KIT

Key Benefits

By eliminating the permanent magnets, dependence of rare earths can be reduced. The compact integration of the WPT technology in a GFRP hollow shaft increases the power density and efficiency. This can only be achieved by using a material that does not interact with the magnetic field of  the WPT system. Since GFRP is a non conductive material it is best suited for this application.
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