Rotor for a high-speed electrical machine

A rotor for a high-speed electrical machine with gas bearings, the rotor comprising:

• at least one rotor side radial bearing,
• a rotor side axial bearing,
• a rotor body section comprising the at least one rotor side radial bearing,
• a rotor end section comprising the rotor side axial bearing,
• wherein, when seen along an axis of rotation of the rotor, a radial bearing section is defined as a section along which a radial bearing extends,
• wherein
• an outer rotor part extends along the rotor end section and the rotor body section,
• the outer rotor part is shaped to form, in the rotor body section, a hollow cylinder serving as a bearing sleeve comprising the at least one rotor side radial bearing,
• wherein the outer rotor part in the rotor end section forms a rotor stub shaft, and the rotor stub shaft carries a part driven by or driving the rotor, and
• at least one rotor plug is arranged inside the bearing sleeve, and the material of the at least one rotor plug has a coefficient of thermal expansion (CTE) lower than 7E-6 K{circumflex over ( )}1.