Turbomachine assembly

Abstract

The invention relates to a turbomachine assembly (10): having an electric machine (19) which has a shaft (20); having at least one compressor section (12a, 12b) for increasing the pressure of a working medium; the respective compressor section (12a, 12b) comprising a compressor shaft (13a, 13b); and / or having at least one expander section for expanding the working medium; the respective expander section comprising an expander shaft; the electric machine (19), the at least one compressor section (12a, 12b) and / or the at least one expander section being arranged in a common, hermetically sealed housing (21); the shafts, i.e. the shaft (20) of the electric machine (19), the respective compressor shaft (13a, 13b) and / or the respective expander shaft all running completely within the hermetically sealed housing (21) and coaxially to one another; and the shafts being mounted in the hermetically sealed housing (21) via active magnetic bearings (22); having at least one electrical current source (24a, 24b) which is arranged outside the hermetically sealed housing (21) and is designed to electrically energize windings of the electric machine (19) and / or the magnetic bearings (22) in order to heat a housing interior (23) delimited by the hermetically sealed housing (21) when the electric machine (19) is at a standstill.

Description

[0001] 1 / 23 PB06268

[0002] Everllence SE

[0003] Turbomachinery arrangement

[0004] The invention relates to a turbomachine arrangement.

[0005] WO 2013 / 139568 A1 discloses a turbomachine arrangement comprising a multi-stage compressor section and an electric machine. A compressor shaft of the compressor section runs coaxially to a shaft of the electric machine. The electric machine and the compressor section are arranged in a common housing and supported by bearings within the housing. Compressed working fluid can be extracted from one stage of the compressor section as a cooling gas, which can be used to cool the electric machine.

[0006] EP 1 074746 B1 discloses a turbomachine arrangement with several compressor sections and an electric machine. The compressor sections and the electric machine that drives the compressor sections are arranged in a gas-tight housing and supported by bearings within the housing. The shaft of each compressor section and the shaft of the electric machine are coaxial and directly coupled. Compressed working fluid, which is diverted from a compressor section, serves to cool the electric machine.

[0007] DE 102007019264 A1 discloses a further turbomachine arrangement with several compressor sections and an electric machine. It is disclosed to extract compressed working fluid from a compressor stage of a compressor section of the turbomachine arrangement, guide it via an impeller side chamber, and from the impeller side chamber, via a discharge channel, into a collection chamber in order to supply this working fluid to a component to be cooled.

[0008] 04.12.20252 / 23 PB06268

[0009] Condensation can form inside the housing of a turbomachine assembly when it is at a standstill, in standby mode, or during transport or storage. This condensate can reduce the service life of the turbomachine assembly. Therefore, it is necessary to counteract condensate formation.

[0010] Based on this, the present invention aims to create a novel turbomachine arrangement in which condensation can be reduced or even completely avoided.

[0011] This problem is solved according to a first aspect of the invention by a turbomachine arrangement according to claim 1 and according to a second aspect of the invention by a turbomachine arrangement according to claim 9. The two aspects of the invention can be used individually or in combination with each other.

[0012] According to the first aspect of the invention, the turbomachine assembly comprises at least one electrical power source arranged outside the hermetically sealed housing. This power source is configured to electrically energize the windings of the electric machine and / or the magnetic bearings to heat the interior of the housing, which is bounded by the hermetically sealed housing, when the electric machine is stationary. This makes it possible to heat the turbomachine assembly, specifically its interior, when stationary, in standby mode, or even during transport or storage, such that a defined temperature can be maintained within the housing and condensation within the housing of the turbomachine assembly can be reduced or even completely prevented. The windings and magnetic bearings can be kept at a desired temperature when stationary, in standby mode, during transport, or during storage.

[0013] 04.12.20253 / 23 PB06268

[0014] By supplying electrical current to the windings of the electric machine and / or the magnetic bearings of the turbomachine assembly, power loss and thus heat are generated. This heat warms the windings and / or the magnetic bearings of the turbomachine assembly and, via them, the interior of the turbomachine assembly, thus preventing condensation. When the electric machine is energized, it is not driven; it remains stationary.

[0015] In a further development of the first aspect of the invention, it is provided that the turbomachine arrangement has at least one temperature sensor arranged inside the hermetically sealed housing, which is configured to detect a temperature inside the housing interior, and / or at least one temperature sensor arranged outside the hermetically sealed housing, which is configured to detect a temperature outside the housing interior, furthermore a control device which is configured to control the at least one electrical current source to provide an electrical current for heating the housing interior, depending on the temperature measured by the at least one temperature sensor.This allows the electrical current to be supplied to the windings of the electric machine and / or the magnetic bearings as required, depending on the temperature inside the housing and / or outside the housing, in order to prevent condensation.

[0016] Preferably, the turbomachine arrangement has at least one first electrical current source for supplying current to the windings of the electric machine, and at least one second electrical current source for supplying current to the magnetic bearings. This is particularly preferred for supplying current to the windings of the electric machine and the magnetic bearings as needed.

[0017] 04.12.20254 / 23 PB06268

[0018] In a further development of the first aspect of the invention, it is provided that the at least one first electric current source is arranged to supply the windings of the electric machine with electric current such that a first phase of the electric current supplied by the electric current source has a first current amplitude, a second phase of the electric current supplied by the electric current source has a second current amplitude, and a third phase of the electric current supplied by the electric current source has a third current amplitude, wherein the second current amplitude is equal in magnitude to the first current amplitude and has a sign opposite to the first current amplitude, and wherein the third current amplitude is zero.Alternatively, the at least one first electrical power source is configured to supply the windings of the electric machine with an electrical current such that a first phase of the electrical current supplied by the power source has a first current amplitude, and a second and a third phase of the supplied electrical current each have a second current amplitude, wherein the second current amplitude is equal in magnitude to half the first current amplitude and has the opposite sign to the first current amplitude. The at least one second electrical power source is preferably configured to supply the magnetic bearings with an alternating current. This allows for a particularly advantageous electrical supply to both the windings of the electric machine and the magnetic bearings.

[0019] The windings of the electric machine and the magnetic bearings can be individually or collectively energized. As described above, a three-phase alternating current is preferably used to energize the windings of the electric machine. However, a single-phase or two-phase electric current can also be used to energize the windings of the electric machine and, in particular, the magnetic bearings of the turbomachine assembly.

[0020] 04.12.20255 / 23 PB06268

[0021] According to the second aspect of the invention, the turbomachine assembly comprises at least one heating device arranged outside the hermetically sealed housing and integrated into a piping system, and optionally at least one movement device integrated into the piping system. The heating device is configured to heat the working medium in order to warm an interior space of the housing bounded by the hermetically sealed housing, and the optional movement device is configured to move the heated working medium through the interior space of the housing. This makes it possible to heat the interior of the turbomachine assembly when it is at rest or in standby mode in such a way that condensation within the interior of the turbomachine assembly can be reduced or even completely prevented.Furthermore, the second aspect of the invention also allows the windings of the electric machine and the magnetic bearings to be kept at a desired temperature by the working medium heated by the heating device. The second aspect of the invention requires a turbomachine arrangement supplied with working medium and is therefore, unlike the first aspect of the invention, not suitable for counteracting condensation during transport or storage of the turbomachine arrangement.

[0022] In a further development of the second aspect of the invention, the turbomachine arrangement comprises at least one temperature sensor located inside the hermetically sealed housing, configured to detect a temperature inside the housing, and / or at least one temperature sensor located outside the hermetically sealed housing, configured to detect a temperature outside the housing. Furthermore, the arrangement includes a control device configured to activate at least the heating element based on the temperature measured by the at least one temperature sensor. This allows the electric heating element to be operated as needed, depending on the temperature inside and / or outside the housing, to prevent condensation.

[0023] 04.12.20256 / 23 PB06268

[0024] The heating device can be electric. The moving device can be a fan or blower.

[0025] In a turbomachine arrangement supplied with working medium, the first aspect of the invention and the second aspect of the invention can also be used in combination with each other.

[0026] Furthermore, the first and second aspects of the invention allow the heating of the turbomachine assembly to reduce stress on the assembly, particularly during startup. Materials of the turbomachine assembly, especially in the area of ​​the windings of the electric motor and the insulation of these windings, can exhibit different coefficients of thermal expansion. These differing coefficients of thermal expansion can cause stress on the turbomachine assembly during startup, potentially leading to damage. The invention makes it possible to avoid such stress on the turbomachine assembly and the resulting damage.

[0027] Preferred embodiments of the invention are described in the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being limited thereto. The drawing shows:

[0028] Fig. 1 is a highly schematic representation of a turbomachine arrangement according to the state of the art,

[0029] Fig. 2 shows the turbomachine arrangement of Fig. 1 with further assemblies known from the prior art,

[0030] 04.12.20257 / 23 PB06268

[0031] Fig. 3 is a highly schematic representation of a turbomachine arrangement according to the first aspect of the invention,

[0032] Fig. 4 shows a first variant of an electric current supplied by the electric power source according to the first aspect of the invention, Fig. 5 shows a second variant of an electric current supplied by the electric power source according to the first aspect of the invention, Fig. 6 shows a third variant of an electric current supplied by the electric power source according to the first aspect of the invention, Fig. 7 shows a highly schematic representation of a turbomachine arrangement according to the second aspect of the invention.

[0033] Fig. 8 shows the turbomachine arrangement according to the second aspect of the invention together with further assemblies.

[0034] Figures 1 and 2 show an exemplary turbomachine arrangement 10 designed as an integrated motor-compressor, comprising two compressor sections 11a and 11b for increasing the pressure of a working medium, preferably for compressing a process gas. In Figure 1, the compressor sections 11a and 11b each have several compressor stages 12a and 12b, as well as a compressor shaft 13a and 13b, respectively. Uncompressed working medium can be supplied to the compressor section 11a, and thus to the turbomachine arrangement 10, via a supply line 14 of the turbomachine arrangement 10. Compressed working medium can be discharged from the compressor section 11b, and thus from the turbomachine arrangement 10, via a discharge line 15 of the turbomachine arrangement 10.

[0035] The working medium, partially compressed by compressor stage 12a, can be supplied to compressor stage 12b for further compression via a line 16. Preferably, optional cooling devices 17, 18 for cooling the working medium are arranged downstream of the respective compressor stages 12a and 12b in the discharge line 15 and in the line 16.

[0036] 04.12.20258 / 23 PB06268

[0037] The turbomachine arrangement 10 of Figs. 1, 2 further comprises an electric machine 19 with a shaft 20, the electric machine 19 serving to drive the compressor sections 11a, 11b. The compressor shafts 13a, 13b and the shaft 20 of the electric machine 19 are coaxial with each other.

[0038] Furthermore, the compressor shafts 13a, 13b and the shaft 20 of the electric machine 19 are preferably coupled directly and without a transmission. Coaxial means that the longitudinal axes of the compressor shafts 13a, 13b and the shaft 19 of the electric machine 20 coincide. Direct and without a transmission means that neither clutches nor gears are interposed between the shafts. The compressor shafts 13a, 13b and the shaft 19 of the electric machine 19 are therefore coupled without clutches or gears.

[0039] The electric motor 19 of the turbomachine assembly 10 and the compressor sections 11a, 11b of the turbomachine assembly 10 are arranged in a common, hermetically sealed and thus gas-tight housing 21 and rotatably mounted in the housing 21 via bearings 22. The hermetically sealed housing 21 can be designed as a single piece or in multiple parts. The compressor sections 11a, 11b, the electric motor 19, and the bearings 22 are all arranged in an inner chamber 23 of the hermetically sealed housing 21 and are surrounded by the working medium, in particular the process gas.

[0040] The shafts, i.e. the shaft 20 of the electric machine 19 and the compressor shafts 13a, 13b, are all completely arranged within the hermetically sealed housing 21, i.e. do not extend through the housing 21 to the outside.

[0041] The bearings 22 are designed as active magnetic bearings.

[0042] 04.12.20259 / 23 PB06268

[0043] In order to counteract condensation within the housing 21 of the turbomachine arrangement 10 when the turbomachine arrangement 10 of Fig. 1 is at rest, in standby mode of the turbomachine arrangement 10 of Fig. 1, or also during transport or storage of the turbomachine arrangement 10 of Fig. 1, a first aspect of the invention proposes that the turbomachine arrangement 10 has at least one electrical power source 24a, 24b arranged outside the hermetically sealed housing 21, which is configured to electrically energize the windings of the electrical machine 19 of the turbomachine arrangement 10 and / or the magnetic bearings 22 of the turbomachine arrangement 10 for heating the interior space 23 of the housing bounded by the hermetically sealed housing 21 when the electrical machine 19 is at rest.

[0044] According to Fig. 3, the turbomachine assembly 10 has at least one first electrical power source 24a for supplying current to the windings of the electric machine 19. The turbomachine assembly 10 has at least one second electrical power source 24b for supplying current to the magnetic bearings 22. Supplying current to the windings of the electric machine 19 and / or the magnetic bearings 22 of the turbomachine assembly 10 generates power loss and thus heat to warm the interior of the housing 23 and to counteract the formation of condensate. When the windings of the electric machine 19 are supplied with current, the machine is not driven; therefore, the electric machine 19 remains stationary.

[0045] The windings of the electric machine 19 and / or the magnetic bearings 22 can be maintained at a desired temperature when stationary, in standby mode, during transport, or in storage. Stress on the turbomachine assembly caused by differing coefficients of thermal expansion can be avoided.

[0046] 04.12.202510 / 23 PB06268

[0047] Preferably, the first electrical current source 24a is configured to electrically energize at least the windings of the electrical machine 19 in order to heat the interior space 23 enclosed by the hermetically sealed housing 21 when the electrical machine 19 is stationary. Additionally, the second electrical current source 24b can then be configured to electrically energize the magnetic bearings 22 in order to heat the interior space 23 enclosed by the hermetically sealed housing 21 when the electrical machine 19 is stationary.

[0048] The turbomachine arrangement 10 of Fig. 3 preferably comprises at least one temperature sensor 25 arranged inside the hermetically sealed housing 17, which is configured to detect a temperature inside the housing interior 23, and / or at least one temperature sensor (not shown) arranged outside the hermetically sealed housing 17, which is configured to detect a temperature outside the housing interior 23. Furthermore, the turbomachine arrangement 10 of Fig. 3 preferably comprises a control device 26, which is configured to control the at least one current source 24a, 24b, depending on the temperature measured by the at least one temperature sensor 25, to provide an electric current for heating the housing interior 23.Then, if the turbomachine assembly 10 includes at least one temperature sensor 25 and the control device 26, the electrical current supply to the windings of the electric machine 19 and / or the magnetic bearings 22 of the turbomachine assembly 10 can be adjusted as needed, depending on the temperature inside the housing 23 and / or outside the housing 23 to prevent condensation. Fig. 3 visualizes a measurement signal 27 from the temperature sensor 25, control signals 28a, 28b generated by the control device 26 for the current sources 24a, 24b depending on the measurement signal 27 of the temperature sensor 25, and electrical currents 29, 30 supplied by the electrical current sources 24a, 24b for the windings of the electric machine 19 and the magnetic bearings 22 of the turbomachine assembly 10 depending on the respective control signal 28a, 28b.

[0049] 04.12.202511 / 23 PB06268

[0050] In particular, if the turbomachine arrangement 10 does not include the at least one temperature sensor 25 and the control device 26, the electric current I shown in Fig. 4 can be supplied by the first power source 24a for the windings of the electric machine 19. The electric current I of Fig. 4 has a first phase U with a first current amplitude A1 and a second phase V with a second current amplitude A2, wherein the second current amplitude A2 is equal in magnitude to the first current amplitude A1 and has the opposite sign to the first current amplitude A1. A third current amplitude of the third phase W of the electric current I of Fig.

[0051] Figure 4 is zero. The amplitudes A1 and A2 have viscous waveforms superimposed on them. When the electric machine 19 is energized with the current I shown in Fig. 4, it remains stationary.

[0052] In particular, when the turbomachine arrangement 10 includes the at least one temperature sensor 25 and the control device 26, the electric currents I shown in Figs. 5 and 6 can be supplied by the first power source 24a for the windings of the electric machine 19. The electric current I of Fig. 5 has a first phase U with a first current amplitude A1, as well as a second phase V and a third phase W, each with a second current amplitude A2, wherein the second current amplitude A2 is equal in magnitude to half the first current amplitude A1 and has the opposite sign to the first current amplitude A1. The amplitudes A1 and A2 are superimposed with viscous waveforms. The electric current I of Fig.Figure 6 has a first phase U with a first current amplitude A1 and a second phase V with a second current amplitude A2, where the second current amplitude A2 is equal in magnitude to the first current amplitude A1 and has the opposite sign to the first current amplitude A1. A third current amplitude, a third phase W of the electric current I in Figure 6, is zero. The amplitudes A1 and A2 are again superimposed with viscous waveforms. When the electric machine 19 is electrically energized with...

[0053] 04.12.202512 / 23 PB06268

[0054] The current I of Fig. 5 or the current I of Fig. 6 remains stationary in each case.

[0055] In contrast to the electric current in Fig. 4, the electric currents I in Figs. 5 and 6 are not supplied continuously over time t, but rather in pulsating phases by the first electric current source 24a. During time intervals t1, the respective current I is supplied with the respective amplitudes A1 and A2, and during time intervals t2, the respective current I decays. The time intervals t1 and t2 and / or the amplitudes A1 and A2 can be determined based on the measurement signal 27 of the at least one temperature sensor 25, either using a characteristic map or a characteristic curve.

[0056] The windings of the electric machine 19 and the magnetic bearings 22 can be individually or collectively energized. A three-phase alternating current is preferably used to energize the windings of the electric machine 19. A two-phase alternating current is preferably used to energize the magnetic bearings 22 of the turbomachine arrangement 10.

[0057] According to the second aspect of the invention (see Fig. 7, 8), the turbomachine arrangement 10 has at least one heating device 32 arranged outside the hermetically sealed housing 17 and integrated into a piping system 31, and at least one optional movement device 33 integrated into the piping system 31, wherein the heating device 32 is configured to heat the working medium in order to heat a housing interior 23 bounded by the hermetically sealed housing 21, and wherein the movement device 33 is configured to move the heated working medium through the housing interior 23.

[0058] The at least one heating device 32 is preferably designed as an electric heating device.

[0059] 04.12.202513 / 23 PB06268

[0060] The at least one movement device 33 is preferably designed as a fan or blower.

[0061] The movement device 33 can also be omitted. In this case, the heated working medium flows through the interior of the housing 23 as a result of natural convection.

[0062] The second aspect of the invention also makes it possible to heat the housing interior 23 of the turbomachine assembly 10 when it is at rest or in standby mode, such that condensation within the housing interior 23 of the turbomachine assembly 10 can be reduced or even completely prevented. The second aspect of the invention requires a turbomachine assembly 10 supplied with working fluid and is therefore, unlike the first aspect of the invention, not suitable for counteracting condensation during transport or storage of the turbomachine assembly 10.

[0063] In a turbomachine arrangement 10 supplied with working medium, the first aspect of the invention and the second aspect of the invention can be used in combination.

[0064] In a turbomachine arrangement 10 according to the second aspect of the invention, at least one temperature sensor can be arranged inside and / or outside the hermetically sealed housing 21, which is configured to detect a temperature inside the housing interior 23 and / or outside the housing interior 23, wherein a control device then controls the at least one, preferably electric, heating device 32 and / or the at least one movement device 33 depending on the temperature measured by the at least one temperature sensor.

[0065] 04.12.202514 / 23 PB06268

[0066] Fig. 8 shows the turbomachine arrangement 10 according to the second aspect of the invention together with the lines 14, 15, 16 and the optional cooling devices 17, 18 of Fig. 1, as well as together with a branch line 34, through which working fluid can be diverted from the compressor section 12a for cooling the electric machine 19 during operation of the turbomachine arrangement 10. A filter 35 is integrated into this branch line 34, which can be closed by means of a valve 36. The working fluid diverted from the compressor section 12a for cooling the electric machine 19 via the branch line 34 can be supplied to the supply line 14 via a return line 37 and an optional cooling device 38 arranged in the return line 37.

[0067] The piping system 31, into which the at least one heating device 32 and the at least one movement device 33 are integrated, can be shut off from a piping system comprising the branch line 34 and the return line 37 by valves 39, 40, which serves to guide the working medium, acting as a cooling gas, through the interior of the housing 23. During compression operation of the turbomachine arrangement 10 of Fig. 8, the valve 36 is open and the valves 39, 40 are closed. To prevent condensation during standby or shutdown operation, the valves 39, 40 are open.

[0068] The temperature sensor, which is located at least outside the hermetically sealed housing 21, can be an environmental sensor in both the first and second aspects of the invention, e.g., located in a machine hall housing the turbomachine assembly 10. Alternatively, the temperature sensor located outside the hermetically sealed housing 21 can be located in one of the lines 14, 15, 16 or in the piping system 31.

[0069] 04.12.202515 / 23 PB06268

[0070] The turbomachine arrangements 10 shown in the figures each have two compressor sections 12a, 12b. This is purely exemplary. There may also be only a single compressor section or more than two compressor sections. The turbomachine arrangement 10 may also have at least one expander section.

[0071] 04.12.202516 / 23 PB06268

[0072] Reference symbol list

[0073] Turbomachinery arrangement

[0074] a compressor section

[0075] b Compressor section

[0076] a compressor stage

[0077] b Compressor stage

[0078] a compressor shaft

[0079] b Compressor shaft

[0080] Supply line

[0081] Drain line

[0082] Line

[0083] Cooling unit

[0084] Cooling unit

[0085] electric machine

[0086] Wave

[0087] Housing

[0088] Storage

[0089] Interior of the casing

[0090] a first electrical power source

[0091] b second electrical power source temperature sensor control device

[0092] Measurement signal

[0093] a control signal

[0094] b Control signal

[0095] electrical current

[0096] electrical current

[0097] Piping system

[0098] Heating device, movement device, branch line

[0099] filter

[0100] 04.12.202517 / 23 PB06268

[0101] 36 valve

[0102] 37 Return line

[0103] 38 Cooling unit

[0104] 39 valve

[0105] 40 valve

[0106] December 4, 2025

Claims

18 / 23 PB06268 Claims 1. Turbomachine arrangement (10), with an electric machine (19) having a shaft (20), with at least one compressor section (12a, 12b) for increasing the pressure of a working medium, wherein the respective compressor section (12a, 12b) has a compressor shaft (13a, 13b), and / or with at least one expander section for depressurizing the working medium, wherein the respective expander section has an expander shaft, wherein the electric machine (19), the at least one compressor section (12a, 12b) and / or the at least one expander section are arranged in a common, hermetically sealed housing (21), wherein the shafts, i.e. the shaft (20) of the electric machine (19), the respective compressor shaft (13a, 13b) and / or the respective expander shaft, all run completely within the hermetically sealed housing (21) and coaxially to each other, and wherein the shafts are mounted in the hermetically sealed housing (21) via active magnetic bearings (22), characterized by at least one electrical power source (24a, 24b) arranged outside the hermetically sealed housing (21), which is configured to electrically energize windings of the electrical machine (19) and / or the magnetic bearings (22) for heating an interior space (23) of the housing bounded by the hermetically sealed housing (21) when the electrical machine (19) is stationary.

2. Turbomachine arrangement (10) according to claim 1, characterized in that at least one of the electrical current sources (24a) is configured to electrically energize the windings of the electrical machine (19) for heating the housing interior (23) bounded by the hermetically sealed housing (21) when the electrical machine (19) is stationary. 04.12.202519 / 23 PB06268 3. Turbomachine arrangement (10) according to claim 2, characterized in that at least one of the electrical current sources (24b) is configured to electrically energize the magnetic bearings (22) for heating the housing interior (23) bounded by the hermetically sealed housing (21) when the electrical machine (19) is stationary.

4. Turbomachine arrangement (10) according to one of claims 1 to 3, characterized by at least one temperature sensor (25) arranged inside the hermetically sealed housing (21), which is configured to detect a temperature inside the housing interior (23), and / or at least one temperature sensor arranged outside the hermetically sealed housing (21), which is configured to detect a temperature outside the housing interior (23), and a control device (26) which is configured to control the at least one electrical current source (24a, 24b) to provide an electric current for heating the interior of the housing (23) depending on the temperature measured by the at least one temperature sensor (25).

5. Turbomachine arrangement (10) according to one of claims 1 to 4, characterized in that it has at least one first electrical current source (24a) for supplying electrical current to the windings of the electrical machine (19), and that it has at least one second electrical current source (24b) for supplying electrical current to the magnetic bearings (22).

6. Turbomachine arrangement (10) according to claim 5, comprising at least one first electrical power source (24a) which supplies the windings of the 04.12.202520 / 23 PB06268 to supply electrical current to the electric machine (19) such that a first phase (U) of the electric current supplied by the respective first electric current source (24a) has a first current amplitude, a second phase (V) of the electric current supplied by the respective first electric current source (24a) has a second current amplitude, and a third phase of the electric current supplied by the respective first electric current source (24a) has a third current amplitude, wherein the second current amplitude is equal in magnitude to the first current amplitude and has a sign opposite to the first current amplitude, and wherein the third current amplitude is zero.

7. Turbomachine arrangement (10) according to claim 5, characterized in that the at least one first electric current source (24a) is configured to supply the windings of the electric machine (19) with an electric current such that a first phase (U) of the electric current supplied by the respective first electric current source (24a) has a first current amplitude, and a second phase (V) and a third phase (W) of the electric current supplied by the respective first electric current source (24a) each have a second current amplitude, wherein the second current amplitude is equal in magnitude to half of the first current amplitude and has a sign opposite to the first current amplitude.

8. Turbomachine arrangement (10) according to one of claims 5 to 7, characterized in that the at least one second electrical current source (24b) is arranged to supply the magnetic bearings (22) with an alternating current. 04.12.202521 / 23 PB06268 9. Turbomachinery arrangement (10), with an electric machine (19) which has a shaft (20), with at least one compressor section (12a, 12b) for increasing the pressure of a working medium, wherein the respective compressor section (12a, 12b) has a compressor shaft (13a, 13b), and / or with at least one expander section for depressurizing the working medium, wherein the respective expander section has an expander shaft, wherein the electric machine (19), the at least one compressor section (12a, 12b) and / or the at least one expander section are arranged in a common, hermetically sealed housing (21), wherein the shafts, i.e. the shaft (20) of the electric machine (19), the respective compressor shaft (13a, 13b) and / or the respective expander shaft, all run completely within the hermetically sealed housing (21) and coaxially to each other, and wherein the shafts are mounted in the hermetically sealed housing (21) via active magnetic bearings (22), characterized by at least one heating device (32) arranged outside the hermetically sealed housing (21) and integrated into a piping system (31), which is designed to heat the working medium to heat an interior space (23) of the housing bounded by the hermetically sealed housing (21).

10. Turbomachine arrangement (10) according to claim 9, characterized by at least one movement device (33) arranged outside the hermetically sealed housing (21) and integrated into the piping system (31), which is configured to move the heated working medium through the housing interior (23).

11. Turbomachine arrangement (10) according to claim 10, characterized in that the at least one motion device (33) is a fan or a blower. 04.12.202522 / 23 PB06268 12. Turbomachine arrangement (10) according to one of claims 9 to 11 , characterized by at least one temperature sensor arranged inside the hermetically sealed housing (21), which is configured to detect a temperature inside the housing interior, and / or at least one temperature sensor arranged outside the hermetically sealed housing (21), which is configured to detect a temperature outside the housing interior (23), and a control device which is configured to control at least one heating device (32) depending on the temperature measured by the at least one temperature sensor.

13. Turbomachine arrangement (10) according to one of claims 9 to 12, characterized in that the piping system (31) into which the at least one heating device (32) is integrated can be shut off from a piping system by means of valves (39, 40) which serves to guide working medium serving as cooling gas through the housing interior (23).

14. Turbomachine arrangement (10) according to one of claims 9 to 13, characterized in that the at least one heating device (32) is an electric heating device (32).

15. Turbomachine arrangement (10) according to one of claims 9 to 14, characterized in that it is further developed according to one of claims 1 to 8. December 4, 2025

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