Abstract: An energy transmission device for contactless transmission of electric energy includes a primary coil device and a secondary coil device, the secondary coil device being supported for rotation relative to the primary coil device about a rotation axis. The primary coil device has a primary yoke element, multiple primary leg elements and a primary winding, the secondary coil device having a secondary yoke element, multiple secondary leg elements and a secondary winding, said primary yoke element and/or the secondary yoke element being made of a laminated core. When viewed in longitudinal section of the rotation axis, the primary yoke element rests against at least one of the primary leg elements and/or the secondary yoke element rests against at least one of the secondary leg elements along a respective joint edge, said respective joint edge and/or a longitudinal center axis of the respective joint edge being slanted relative to the rotation axis.

Abstract: The thermal load of an electrical component is used as a basis to limit an electric current through the electrical component, in particular the rotor winding of a turbogenerator. This reliably avoids overheating of the component and at the same time achieves full exhaustion of the electric current, particularly in the case of field forcing.