When lubricating with the ambient air or the gaseous working medium, the contamination of the operating medium, which is inadmissible in many applications (e.g. compressors, cooling turbines), can be avoided. In addition, oil seals can be dispensed with, which considerably simplifies the overall design. This means that other overall designs (encapsulated designs) are possible at all. Foil bearings are a type of air bearing in which a compliant foil structure is used between the rigid bearing housing and the air film. This foil structure serves to improve the adaptability of the bearing to rotor movements and brings with it an external damping mechanism, whereby the bearing remains stable over an extended speed range.