COMPACT TURBOMACHINE WITH MAGNETIC BEARINGS AND AUXILIARY BEARINGS

摘要

A turbo-machine for compressing or expanding a fluid comprises a housing (201), a rotary shaft (203), an electric machine (207), an impeller (202) mounted at an end of the rotary shaft (203), radial magnetic bearings (208), an axial magnetic bearing (210), an axial detector (240), radial detectors (209), a control circuit, and auxiliary bearings (290). An auxiliary bearing (290) is integrated within a stator portion (211, 212) of the axial magnetic bearing (210) and this stator portion (211, 212) of the axial magnetic bearing (210) is located opposite a rotor armature (220) of the axial magnetic bearing (210). The rotor armature (220) is made of iron or of a material which is adapted to be attracted in a magnetic field and is constituted by a rear face (221) of the impeller (202).

主权项

1. A turbo-machine for compressing or expanding a fluid, comprising:
a housing (101; 201), a rotary shaft (103; 203) mounted within the housing (101; 201), an electric machine (207) associated with the rotary shaft (103; 203), at least a first impeller (102; 202) for compressing or expanding the fluid, the at least first impeller (102; 202) being mounted at a first end of the rotary shaft (103; 203), radial magnetic bearings (208) for radially supporting the rotary shaft (103; 203) in a contactless manner, at least a first axial magnetic bearing (110; 210), at least one axial detector (140; 240) for sensing the axial position of the rotary shaft (103; 203), radial detectors (209) for sensing the radial position of the rotary shaft (103; 203), a control circuit (130) for controlling the at least first axial magnetic bearing (110; 210) and the radial magnetic bearings (208) from information signals outputted by the at least one axial detector (140; 240) and the radial detectors (209), and auxiliary bearings (170; 180; 290), wherein the at least a first auxiliary bearing (170; 180; 290) is integrated within a first stator portion (111, 112; 211, 212) of the at least first axial magnetic bearing (110; 210) wherein the first stator portion (111, 112; 211, 212) of the at least first axial magnetic bearing (110; 210) is located opposite a first rotor armature (120; 220) of the at least first axial magnetic bearing (110; 210), and wherein the first rotor armature (120; 220) is made of iron or of a material which is adapted to be attracted in a magnetic field and is constituted by a rear face (121; 221) of the at least first impeller (102; 202).