Abstract:
The present disclosure provides a superconducting magnetic bearing as support system between two relatively movable parts (1, 2). One of the parts (2) includes a superconducting unit comprising at least one superconducting element (19) and a cryostat (25) with a housing (22). The at least one superconducting element (19) is provided inside the housing (22) of the cryostat (25). The other part (1) comprises at least one magnetic field generating element (21). The superconducting unit (19, 22, 25) and the magnetic field generating element (21) are arranged so that one of the superconducting unit (19, 22, 25) and the magnetic field generating element (21) is contactlessly supportable through interaction of the superconducting element (19, 22, 25) and a magnetic field generated by the magnetic field generating element (21). To damp vibrations and to reduce the generation of heat in the superconducting element (19) at least one electrically conductive layer (28a) is arranged between the at least one superconducting element (19) and the magnetic field generating element (21) as eddy current damper.
Abstract:
A magnetic bearing assembly for a rotary machine having a rotor shaft (12), comprising a stator magnetic circuit secured to a stationary support element and comprising at least one body of ferromagnetic material and at least one coil, both being fitted in a protective annular housing leaving uncovered a surface of revolution of said ferromagnetic body (22) and a surface of revolution of said one coil, the magnetic bearing assembly comprising an annular thrust collar (16) secured to the rotor shaft (12) and radially extending towards the stator magnetic circuit by a radial portion (16b), said radial portion (16b) facing the uncovered surfaces of said ferromagnetic body and said one coil. The annular thrust collar (16) comprises at least one flow channel(30).
Abstract:
A magnetic bearing is disclosed that includes a sensing wire wrapped around one or more of the bearing coils and configured to measure the resistance to ground of each bearing coil. With the presence of contaminants such as liquids, a protective coating disposed about the bearing coils degrades over time, thereby reducing the resistance to ground of the bearing coils. The sensing wire transmits the detected resistance to ground of the bearing coils to an adjacent sensing device, which can provide an output that informs a user whether corrective action is required to prevent damage or failure of the magnetic bearing.
Abstract:
A turbocompressor assembly (10) which is divided along an axis- (12) of a rotor (11) into at least three sections (13, 18, 22), a bearing section (13) having at least one active magnetic bearing (14), a motor section (18) comprising a motor (19) having a stator (20) arranged along the axis (12) of the rotor, the stator enclosing a circumferential motor gap (21) formed between the stator and the rotor, a compressor section (22) having a compressor (23) for compressing a cooling fluid (30), a gastight housing (26) enclosing the rotor, the bearing section, the motor section and the compressor section and a cooling system (27) having an inlet (28) for supplying the pressurized cooling fluid (30) to the bearing section and the motor section through a fluid channel (29) positioned between the bearing section and the motor section, characterized in that the cooling system further comprises a throttling means (31) positioned adjacent to the motor gap for limiting the flow of cooling fluid from the fluid channel to the motor gap.
Abstract:
Arrangement (1) with an electric motor (3) driving a pump (2), which is delivering a process fluid (10) along a flow path (100), which flow path extends along a gap (35) between a stator (32) and a motor rotor (31) of the electric motor (3). To avoid rotor dynamic instability caused by 10 hydrodynamics in the gap (35) flow guiding elements (17) are provided in the flow path (100).
Abstract:
The invention relates to a magnetic bearing and to a method for operation thereof. The magnetic bearing contains a ferromagnetic, movably mounted bearing element (1) and at least two magnetic devices (3o, 3u) arranged on opposing sides of the bearing element (1) and equipped with windings (6), wherein during operation of the magnetic bearing, electric currents are conducted through the windings (6) and these currents are regulated such that in an equilibrium state between the bearing element (1) and the two magnetic devices (3o, 3u), bearing gaps (10o, 10u) of predetermined size (So, Su) form. According to the invention, the temperatures produced in the magnetic devices (3o, 3u) during operation are measured and the regulation of the currents takes place such that in the equilibrium state, regardless of the load situation, the same temperatures appear in the magnetic devices (3o, 3u) or in the windings (6) thereof (figure 1).
Abstract:
A compressor unit comprises a centrifugal compressor (1) for compressing a gas, having a rotor (2) with one or more compressor impellers (3), and an electric motor (4) having a stator (5) and a rotor (6), for driving the rotor (2) of the compressor. The compressor and the electric motor are accommodated in a common gas-tight housing (7) which is provided with a gas inlet (8) and a gas outlet (9) . The rotor of the compressor and the rotor of the electric motor are arranged on a common rotor shaft (10) which is mounted in magnetic bearings (11, 12, 15). The rotor shaft (10) comprises a single unit and is mounted in two radial magnetic bearings (11, 12), each in the vicinity of one end of the common rotor shaft, and one axial magnetic bearing (15), which is arranged in the vicinity of one (11) of the radial bearings.
Abstract:
The invention relates to a device (1) for treating objects, especially silicon wafers (2), with a medium (3). The device comprises a container (4) for receiving said medium (3), a support device (5), which can rotate, which is at least partially situated in the container (4) and which receives the objects to be treated, and a rotary-driven shaft. Said shaft is mounted in at least one bearing (13, 14) and is connected to the support device (5), said bearing (13, 14) having a first bearing part (22) that is connected to the shaft and second bearing part (22) that is adjacent to the first bearing part and contains a supraconductive material. The first bearing part (22) is kept at a distance from the second bearing part (24) by magnetic forces.