Abstract: The An aspect of the invention relates to a machine comprising a rotor that is mounted so it can rotate about a rotational axis, and a superconductive winding located in a winding support. Further, Connection connection devices are provided to retain the winding support inside a rotor external housing. To compensate changes caused by the expansion of the winding support, a connection device should have at least one connection element that extends axially. One with one end of the element is connected to the winding support in a fixed manner, and the opposite free end is connected to a centering retaining element of the rotor eternal housing in a non-positive radial fit, so that it can be displaced axially.