Maskine med sikkerhedsleje

摘要

A machine comprises a rotor (101), a stator (102), main bearings (103), and safety bearings (104) for supporting the rotor in a situation where the main bearings are non-operating. When the rotor is supported by the main bearings, there are radial and axial clearances between the rotor and the safety bearings. A contact surface (107) of the rotor contacting the safety bearing in response to closure of the axial clearance is oblique with respect to a spatial plane perpendicular to a rotational axis of the rotor so that an angle (±) between the rotational axis and a normal of the contact surface at a point of contact between the rotor and the safety bearing is greater than zero and at most 10 degrees. The obliqueness of the contact surface eliminates at least partly an excitation for whirling motion when the rotor is supported by the safety bearings.