Assembly for an electrically excited machine

Abstract

The present invention relates to an assembly (1) for an electrically excited machine (100), comprising: a machine rotor (10); an excitation device (6, 7, 20) for electrically exciting the machine (100); and a cooling device (80, 81, 82, 90) for cooling the excitation device. The excitation device comprises an energy transmission system (20), which is integrated in the machine rotor (10) and is designed to contactlessly transmit electrical energy from a primary side (2) of the energy transmission system (20) to a secondary side (4) of the energy transmission system (20), and an electronics device (6, 7). The machine rotor (10) has a machine rotor shaft (13), and the energy transmission system (20) and the electronics device (6, 7) of the excitation device are arranged in a cavity (12) of the machine rotor shaft (13). The cooling device (80, 81, 82, 90) has an inflow channel (80), extending along the longitudinal axis (21) of the energy transmission system (20), for a coolant, and has a plurality of return channels (81, 82), extending in parallel with the longitudinal axis (21) of the energy transmission system (20), for the coolant.

Description

Arrangement for an electrically excited machine

[0001] The present invention relates to an arrangement for an electrically excited machine and to an electrically excited machine, in particular an electrically excited synchronous machine.

[0002] Particularly in the area of ​​traction drives, the synchronous machine is established due to its high torque and power density. For example, permanent magnet synchronous machines are characterized by their compact design and high performance. However, this compact design requires expensive rare earth elements, which are required to manufacture high-energy permanent magnets. In addition, the permanent rotor field has a detrimental effect on efficiency at high rotational speeds, as the magnetic field must be actively weakened. An alternative to the permanent magnet synchronous machine is the electrically excited synchronous machine (EESM), which does not require permanent magnets and This makes it more cost-effective to manufacture. In addition to the cost advantage, the EESM also generally offers increased safety compared to a permanent magnet synchronous machine, as the rotor excitation can be switched off and no voltage is induced in the event of a fault.

[0003] To generate a magnetic field on the rotor of an electrically excited synchronous machine, electrical energy must be transferred to the rotor or to an excitation winding of the rotor of the electrically excited synchronous machine. For this purpose, the rotor of the electrically excited synchronous machine can be powered from a DC voltage source via slip rings or via additional rotating transformers and rectifiers.

[0004] The additional energy transfer system required is usually attached laterally in the axial direction to the active part of the synchronous machine, which increases the installation space in the axial direction. The additional energy transfer system required for energy transfer, i.e. a slip ring system or a contactless energy transfer system (also known as a wireless power transfer (WPT) system), therefore results in a less compact design compared to a permanent magnet synchronous machine. However, for many applications, e.g. in the field of electromobility, a compact design, particularly in the axial direction, is of great importance. The installation space required in addition to the synchronous machine should be as small as possible so as not to reduce the power density due to the energy transfer system, for example compared to permanent magnet synchronous machines.

[0005] DE 10 2020 207 000 B4 discloses an arrangement for an electrically excited machine. The arrangement comprises a machine rotor and an excitation device with an energy transmission system for electrically exciting the machine. The energy transmission system is integrated into the machine rotor. and designed to transmit electrical energy from a primary side of the energy transmission system to a secondary side of the energy transmission system without contact.

[0006] The present invention is based on the object of further improving the known arrangement for an electrically excited machine and the known electrically excited machine, in particular with regard to mechanical strength, the required installation space and cooling.

[0007] According to one aspect of the present invention, there is provided an assembly for an electrically excited machine, comprising: a machine rotor; excitation means for electrically exciting the machine;and a cooling device for cooling the excitation device, wherein the excitation device comprises an energy transmission system which is integrated in the machine rotor and designed to transmit electrical energy from a primary side of the energy transmission system to a secondary side of the energy transmission system without contact, and an electronics device, wherein the machine rotor has a machine rotor shaft and the energy transmission system and the electronics device of the excitation device are arranged in a cavity of the machine rotor shaft, wherein the cooling device has an inlet channel for a coolant extending along the longitudinal axis of the energy transmission system and a plurality of return channels for the coolant extending parallel to the longitudinal axis of the energy transmission system.

[0008] According to a further aspect of the present invention, there is provided an electrically excited machine comprising a machine stator and an assembly for an electrically excited machine as provided herein.

[0009] Preferred embodiments of the invention are defined in the dependent claims.

[0010] The invention is based on the idea of ​​arranging, in addition to the energy transmission system, its electronics device, in particular its rectifier, and a cooling device for cooling the excitation device, i.e., the energy transmission system and its electronics device, in the cavity of the machine rotor shaft, i.e., for example, a hollow shaft. This integration of several components in the cavity offers the advantage, on the one hand, that the installation space requirement is significantly reduced and an extremely compact electrically excited machine can be realized or provided. Furthermore, compared to the design from DE 102020 207 000 B4, the electrical components are located on a significantly smaller diameter, thereby enormously improving the mechanical strength and resistance to vibrations and shock loads of the components.This is particularly important for high-speed machines, such as new traction machines, with very high speeds of up to several tens of thousands of revolutions per minute.

[0011] The design proposed by the invention further enables the combined integration of the excitation device and the cooling device, particularly in the form of a hollow rotor shaft cooling system, into the machine rotor shaft. This allows both the machine rotor and the energy transmission system, as well as its electronics, to be cooled efficiently and without particularly significant additional mechanical effort, particularly for the cooling device.

[0012] The proposed arrangement is particularly suitable for the realisation or production of an electrically excited synchronous machine or can be used for the realisation or production of an electrically excited synchronous machine. , particularly in an inductively excited synchronous machine (iE-ESM). However, the arrangement may also be suitable for other electrically excited machines, such as a transverse flux machine. In particular, the arrangement may be or become a component of an electrically excited synchronous machine or a transverse flux machine.

[0013] A "machine rotor" is understood to mean, in particular, a rotor of an electrically excited machine or a rotor for an electrically excited machine. In other words, a machine rotor is a rotor that is suitable for an electrical machine, can be used for an electrical machine, and / or is intended for an electrical machine. In the EESM, the magnetic rotor field is generated at least partially (e.g., in combination with a permanent magnet) or completely by an electric current. The machine rotor has a machine rotor shaft with a cavity.

[0014] The "excitation device" is particularly suitable for electrically exciting the machine rotor. In particular, the excitation device can be used to transfer energy from a power source to the machine rotor. For the purposes of this description, "excitation" is understood to mean, in particular, supplying an excitation winding or coil with electrical current and / or generating a magnetic field on the rotor (as a result of the supplied current).

[0015] The energy transmission system may, for example, comprise or be a slip ring system. However, the energy transmission system is preferably a contactless or wireless, in particular an inductive or capacitive, energy transmission system, such as that used in an iEESM.

[0016] Preferably, the energy transmission system comprises a resonant inductive transformer which is connected by resonant inductive coupling between primary and secondary transmits electrical energy. For this purpose, one or more resonant circuits can be provided on the primary and / or secondary sides, for example, with a capacitor and a coil whose resonant frequency is tuned to the transmission frequency. The resonance between the resonant circuits leads to improved magnetic coupling between the primary side (preferably a primary coil) and the secondary side (preferably a secondary coil) at the transmission frequency. Unlike a rotary transformer with fixed / high coupling, the two coils of the primary and secondary sides are only loosely coupled.

[0017] An electronic device is assigned to the energy transmission system, for example in the form of an electronic circuit board, which in particular comprises a compensation unit for compensating reactive power and / or a rectifier for rectifying an alternating voltage generated by the energy transmission system.

[0018] In a preferred embodiment, the return channels run between the primary and secondary sides of the energy transmission system and / or between the secondary side of the energy transmission system and the machine rotor shaft. This allows the cooling device to be designed with a simple mechanical structure, yet still effectively cool the energy transmission system and / or the machine rotor shaft.

[0019] In a further embodiment, a support structure is arranged between the secondary side of the energy transmission system and the machine rotor shaft, in which one or more of the return channels, in particular all return channels, run. The support structure essentially supports the secondary side of the energy transmission system, for example, secondary windings of an inductive energy transmission system with primary and secondary windings. At the same time, channels in the support structure serve for the return of the coolant.

[0020] In a further embodiment, the cooling device further comprises a heat sink connected to the electronic device. In particular, one or more components of the electronic device or an entire electronic circuit board are thermally connected to the heat sink. This enables particularly effective cooling of the electronic device.

[0021] The electronics device can be arranged entirely or partially on a rear side of the heat sink facing away from the energy transfer system and / or within the heat sink. The coolant then impacts the front side of the heat sink and is then directed back to the return channels.

[0022] The electronic device can comprise a circuit board, in particular with a rectifier and / or electronic components for communication and / or measurement acquisition, which is arranged on the rear side of the heat sink, in particular perpendicular or parallel to the longitudinal axis of the energy transmission system. A particularly close arrangement of components of the electronic device to the central longitudinal axis is advantageous in order to achieve the highest possible mechanical strength at high speeds.

[0023] In an advantageous embodiment, the heat sink has a blind hole on its rear side, in particular a blind hole running along the longitudinal axis of the energy transmission system, on the inner circumferential surface and / or bottom surface of which at least one electronic component of the electronic device, in particular a rectifier, parts of a rectifier and / or electronic components for communication and / or measurement detection, is arranged. In particular, the arrangement on an inner circumferential surface of the blind hole enables radial mechanical support of the components arranged there, which further increases the mechanical strength. Dissipation of heat from the components of the electronic device, for example from components on The circuit board can still be very well ensured, for example through the circuit board, radially outwards to the heat sink.

[0024] In a further embodiment, it is provided that the front side of the heat sink facing the energy transmission system is designed to deflect the coolant impinging from the inlet channel to the return channels, in particular has a concave surface.

[0025] In principle, either a part of the machine rotor shaft or an element provided separately from the machine rotor shaft can serve as a heat sink. If one or more parts of the machine rotor shaft serve as heat sinks, they are made of a particularly thermally conductive material; however, no installation space is required for a separate heat sink.

[0026] Furthermore, one embodiment provides for the energy transmission system, the heat sink, and the electronic device to be arranged one behind the other in the cavity of the machine rotor shaft, as viewed from a coolant inlet opening of the inlet channel along the longitudinal axis of the energy transmission system. Alternatively, another embodiment provides for the electronic device, the heat sink, and the energy transmission system to be arranged one behind the other in the cavity of the machine rotor shaft, as viewed from a coolant inlet opening of the inlet channel along the longitudinal axis of the energy transmission system. The first variant enables a simpler assembly sequence, the arrangement of components (e.g. rectifier components) of the electronic device on a smaller radius, and a smaller "pin length" on the primary side of the energy transmission system, which is particularly advantageous for bearings.The second variant allows for simpler and shorter cable routing.

[0027] Furthermore, it can be provided that a shield is arranged between the secondary side of the energy transmission system and the machine rotor shaft or on the outer circumference of the machine rotor shaft, in particular if the machine rotor shaft is not made of metal (e.g. steel), but for example of a fiber-reinforced plastic (FRP). This shield is preferably formed from an electrically highly conductive material (e.g. copper and / or aluminum) and serves for magnetic shielding radially outwards. Furthermore, the shield can also serve as an additional heat sink.

[0028] The machine rotor shaft is usually made of a metallic material. In an alternative design, it can be made entirely or partially of a non-metallic material, in particular plastic, fiber-reinforced plastic, ceramic, or fiber-reinforced ceramic. If the machine rotor shaft is manufactured from fiber-reinforced plastic, a shield can be arranged radially outward between the machine rotor shaft and a rotor core of the machine rotor. Placing such a shield further radially outward results in the machine rotor shaft, e.g. made of fiber-reinforced plastic, behaving like air from a magnetic perspective. Thus, the necessary distance between the secondary side and the shield is in the area of ​​the machine rotor shaft, which leads to a significant reduction in installation space.

[0029] In a further embodiment, it is provided that a further return channel, in particular in the region of a bearing of the machine rotor shaft, and / or one or more lateral outlet openings through the wall of the machine rotor shaft are provided for discharging the coolant from the cavity of the machine rotor shaft.

[0030] In a preferred embodiment, the machine rotor has a machine rotor shaft and the energy transmission system of the excitation device is arranged in a cavity of the machine rotor shaft. The machine rotor shaft is therefore designed as a hollow shaft. In other words, the machine rotor shaft is hollow-shaped.

[0031] In a further preferred embodiment, the energy transmission system of the excitation device is designed for contactless energy transmission. Contactless energy transmission is understood to mean, for example, wireless, brushless, and in particular inductive or capacitive energy transmission. In particular, the energy transmission system of the excitation device is an inductive or capacitive energy transmission system. In the case of inductive energy transmission, the energy transmission takes place, in particular, with the aid of a magnetic field.

[0032] As already mentioned above, the energy transmission system can in principle also include or be a slip ring system. However, the use of a contactless energy transmission system (particularly an inductive energy transmission system) offers a number of advantages. In contrast to a slip ring system, a contactless energy transmission system is wear-free. Due to its integration into the rotor of the electric machine, access to the energy transmission system in an existing system, e.g., to replace the slip rings, is difficult and therefore unsuitable for series products. Furthermore, (graphite) dust generated by the slip ring can hardly be removed. The use of a contactless transmission system offers more geometric freedom than that of a slip ring system.

[0033] By integrating the energy transfer system into the rotor, it is thermally encapsulated, so that hardly any heat can be dissipated from the rotor's interior. Furthermore, the efficiency of a contactless energy transfer system can be higher. In particular, the use of highly electrically conductive materials for flux shielding can achieve efficiencies in the range of 90% and more can be achieved across the entire operating range, meaning that a contactless energy transfer system has no disadvantages in terms of efficiency compared to slip ring systems. The losses in a contactless energy transfer system are independent of the machine's speed. A contactless energy transfer system is particularly advantageous for large shaft diameters because it avoids increased heat generation and increased wear, such as would occur with a slip ring system at high angular velocities.

[0034] In a further preferred embodiment, the energy transmission system comprises a rotating energy transmission device or a rotating energy exchanger. In particular, the energy transmission system of the excitation device comprises an exciter stator and an exciter rotor. The energy transmission system is preferably designed as an external rotor, i.e. the exciter stator is arranged inside the exciter rotor. In other words, the exciter stator and exciter rotor are arranged such that the exciter rotor can rotate around the exciter stator. The exciter stator is preferably made of a material that is both magnetically and electrically non-conductive. The exciter stator is particularly preferably made of a plastic (in particular a thermoplastic plastic) such as POM or PEEK. The exciter stator (orA round rod of the exciter stator, which extends into the exciter rotor, can have a bore (particularly along the longitudinal axis of the exciter stator, i.e., a longitudinal bore or channel) to cool the exciter stator from the inside, particularly with air, water, and / or oil as a coolant. Such cooling can prevent overheating of the energy transmission device inside the synchronous machine rotor or in the cavity of the machine rotor shaft, and increase efficiency.

[0035] In a further preferred embodiment, the energy transmission system is arranged in the machine rotor such that the exciter rotor is rotationally fixedly connected to the machine rotor or the rotor shaft of the machine rotor. In particular, the exciter stator is an inner stator, and the exciter rotor is an outer rotor. In other words, the exciter stator is arranged within the exciter rotor.

[0036] In a further preferred embodiment, the machine rotor has an excitation winding, wherein the excitation device is designed to transfer electrical energy contactlessly from an excitation stator to an excitation rotor of the excitation device, and finally from the excitation rotor to the excitation winding of the machine rotor. The energy transfer from the excitation rotor to the excitation winding of the machine rotor is carried out, in particular, via a cable-guided electronic system (in particular via a reactive power compensation or reactive power compensation unit and / or a rectifier).

[0037] In a further preferred embodiment, the excitation device comprises two or more energy transmission systems. In particular, the machine rotor can have two or more (divided or separate) rotor windings or rotor winding sections, wherein the excitation device preferably has an associated energy transmission system for each rotor winding or rotor winding section. This can have advantages, for example, in operation or control. Furthermore, it can ensure reliability, and the installation space available in the hollow shaft can thus be used as effectively as possible.

[0038] Alternatively or additionally, the excitation device further comprises at least one data transmission system, which is preferably integrated in the rotor of the machine. The data transmission system is preferably designed for contactless or wireless, in particular brushless, capacitive or inductive transmission of data (in particular with the aid of a magnetic field). Preferably, the data transmission system is arranged in a cavity of the machine rotor shaft. Preferably, the data transmission system is designed to transmit data of the rotor (e.g. temperature and / or current of the rotor or the rotor winding), which is detected e.g. by means of sensors and / or measuring devices. Preferably, the data transmission system comprises a data transmission stator and a data transmission rotor, wherein the data transmission rotor is preferably connected in a rotationally fixed manner to the machine rotor or the rotor shaft of the machine rotor. Preferably, the data transmission takes place contactless from the data transmission rotor to the data transmission stator of the data transmission system.

[0039] In a further preferred embodiment, an additional electrically conductive material layer is arranged on at least one active part of the energy transmission system, wherein an active part of the energy transmission system is a part of the energy transmission system that is at least partially exposed to a magnetic field used for energy transmission, and wherein the electrical conductivity of the additional material layer is greater than the electrical conductivity of the at least one active part. By arranging an additional electrically conductive material layer on at least one active part of the energy transmission system, in particular on the exciter stator, the efficiency of the energy transmission system can be increased. In particular, the efficiency of the energy transmission system can be increased and / or a reduction in heat generation in the energy transmission system can be achieved.

[0040] The arrangement of an additional electrically conductive material layer on at least one active part of the energy transmission system comprises in particular applying an additional electrically conductive material layer to at least one active part of the energy transfer system. In particular, an additional electrically conductive material layer can be added to at least one active part of the energy transfer system.

[0041] The term "additional electrically conductive material layer" means that an electrically conductive material layer is used in addition to the already existing electrically conductive materials of the energy transmission system. An energy transmission system comprises a variety of electrically conductive components or materials that are used or necessary for the intended function of the energy transmission system. For example, the stator, rotor, or shaft of the energy transmission system comprises electrically conductive materials that enable the basic function of the energy transmission system—namely, to transmit energy. However, an "additional electrically conductive material layer" is not among the materials intended or required for the basic operation of the energy transmission system.The “additional electrically conductive material layer” represents an additional component in addition to the already existing electrically conductive materials of the energy transmission system, which is not absolutely necessary for operation, but can reduce heat generation during operation of the energy transmission system and increase the efficiency of the energy transmission system.

[0042] The term "active part" (also "active component" or "active area") of the energy transmission system refers to a part, component, or area of ​​the energy transmission system that is at least partially exposed to the magnetic field used for energy transmission. In particular, it refers to a part, component, or area of ​​the energy transmission system that is subject to a magnetic field strength or magnetic flux density caused by the magnetic field used for energy transmission. which is at least 1%, preferably at least 0.1%, and particularly preferably at least 0.01% of the magnetic field strength or magnetic flux density generated by the magnetic field used for energy transmission. In other words, an active part of the energy transmission system within the meaning of the present description is in particular a part, a component, or a region of the energy transmission system which is still exposed to the magnetic field used for energy transmission to at least 1%, preferably at least 0.1%, and particularly preferably at least 0.01%.An active part is, in particular, a part, component, or region of the energy transmission system located at a point in the energy transmission system where more than 1%, preferably more than 0.1%, and particularly preferably more than 0.01% of the maximum value of the magnetic flux density present in the energy transmission system is still present. The above values ​​refer to the magnetic flux density that is generated or can be measured by the coils of the energy transmission system in an air space without metallic components.

[0043] The additional electrically conductive material layer can, for example, be made entirely or partially of copper and / or silver and / or gold.

[0044] It has been recognized that the materials used in a rotating energy transmission system (e.g. for the stator, rotor and / or shaft) which are exposed to the magnetic field generated for energy transmission can become considerably hot due to eddy currents induced in these materials by the magnetic field. This also results in losses which reduce the efficiency of the energy transmission system. The extent of heating in a material depends in particular on the electrical conductivity of the material. For materials with a relatively low electrical conductivity, such as steel, the heating is generally higher than for materials with a higher electrical conductivity, such as copper or silver.

[0045] To reduce heating or heat generation, an additional highly conductive material layer can be arranged or applied to a less conductive material of the energy transfer system that is exposed to the magnetic field generated for energy transfer. Due to the so-called skin effect, this can advantageously ensure that the magnetic field or alternating magnetic field used for energy transfer penetrates less deeply into the material composite. This is because the so-called penetration depth of the magnetic field and thus also of the eddy currents induced by the magnetic field into the material is smaller the lower the specific electrical resistance, i.e., the greater the electrical conductivity, of the material.In particular, this makes it possible to ensure that eddy currents arise primarily or exclusively in the additional, highly electrically conductive material layer, which advantageously further contributes to reducing heating of the material composite caused by the eddy currents. "Material composite" refers to a composite or combination of the material to which the additional electrically conductive material layer is applied and the additional electrically conductive material layer.

[0046] At high frequencies, eddy currents only occur at the surface of the material. It is possible to ensure that the eddy currents penetrate the material as little as possible and, at the same time, arise primarily or exclusively in the additional material layer, reducing heating and thus any energy or power losses. Consequently, the efficiency of the energy transfer system can also be increased.

[0047] Typical operating frequencies for contactless inductive energy transfer are in the range of 50-500 kHz or even up to the MHz range, which corresponds to a penetration depth of 297-93 pm for copper. Developments in power electronics now allow for higher frequencies, so a frequency of 500 kHz will be considered below. Furthermore, the coil system can also be A higher frequency can be optimized, and thus the size of the coil and capacitor can be reduced. The present invention is even more advantageous with a smaller penetration depth associated with a higher frequency.

[0048] In a preferred embodiment, the at least one active part of the energy transmission device is a component of a stator and / or a rotor of the energy transmission system. In other words, the at least one active part of the energy transmission system comprises a stator and / or a rotor of the energy transmission system. In particular, the at least one active part of the energy transmission system is a stator and / or a rotor of the energy transmission system.

[0049] In a further preferred embodiment, the at least one active part of the energy transmission device comprises a rotor shaft and / or a heat sink and / or a ferrite plate and / or a housing and / or a ferrite disk and / or a cover and / or a stator winding of the energy transmission system. In particular, the at least one active part of the energy transmission device is a rotor shaft and / or a heat sink and / or a ferrite plate and / or a housing and / or a ferrite disk and / or a cover and / or a stator winding of the energy transmission device. The rotor shaft can be a steel shaft, for example.

[0050] In a further preferred embodiment, the layer thickness of the arranged additional material layer is selected depending on a predetermined frequency of the magnetic field used for energy transmission or the associated magnetic flux density. The predetermined frequency corresponds in particular to the operating frequency at which the energy transmission device is operated or is intended to be operated. In this way, The penetration depth of the magnetic field and thus the penetration depth of eddy currents induced by the magnetic field are adjusted such that the eddy currents arise primarily or exclusively in the additional material layer provided, i.e., they penetrate only to a small extent or not at all into the active parts of the energy transmission system. Preferably, the layer thickness of the additional electrically conductive material layer is selected such that at least 60%, in particular 63%, of the eddy currents induced by the magnetic field used for energy transmission are formed or occur in the additional material layer in the region of the additional material layer provided.More preferably, the layer thickness of the additional electrically conductive material layer is selected such that, in the region of the arranged additional material layer, eddy currents induced by the magnetic field used for energy transfer are formed or occur in the additional material layer to an extent of at least 70%, even more preferably at least 80%, even more preferably at least 90%, most preferably at least 95%, and in particular at least 99%. Conversely, this means that the proportion of eddy currents generated by the magnetic field in the active part of the energy transfer system, i.e., in the materials to which the additional electrically conductive material has been arranged or applied, is a maximum of 40%, preferably a maximum of 20%, even more preferably a maximum of 10%, and most preferably a maximum of 5%.

[0051] In a further preferred embodiment, the layer thickness of the arranged additional material layer corresponds to at least one penetration depth into the material of the additional material layer caused by the skin effect or caused as a result of the skin effect at a predetermined frequency of the magnetic field used for energy transmission. The predetermined frequency corresponds in particular to the operating frequency at which the energy transmission system is operated or is intended to be operated. Preferably, the The thickness of the additional material layer is at least twice, more preferably three to five times, i.e., at least three times, at least four times, or at least five times, the penetration depth into the material of the additional material layer caused by or resulting from the skin effect at a given frequency of the magnetic field used for energy transfer. In this way, any losses are advantageously generated primarily or only in the additional highly conductive material.

[0052] In a further preferred embodiment, the additional electrically conductive material layer has a relative permeability pr of approximately 1. In other words, the additional electrically conductive material layer does not exhibit any increased magnetic conductivity. In this way, any eddy current losses can be kept low or minimized.

[0053] Alternatively or additionally, the additional electrically conductive material layer is arranged or applied to a non-conductive material of the at least one active part, which is arranged in a region of the energy transmission system that is to be shielded from an outer region of the energy transmission device against the magnetic field used for the energy transmission.

[0054] In a further preferred embodiment, the energy transmission system comprises a stator and a rotor, wherein the at least one active part of the energy transmission device is a component of the stator and / or rotor of the energy transmission system.

[0055] In a further preferred embodiment, the at least one active part of the energy transmission system comprises or is a rotor shaft, in particular a steel shaft, and / or a stator winding.

[0056] In a further preferred embodiment, the layer thickness of the arranged additional material layer is selected as a function of a predetermined frequency of the magnetic field used for energy transmission.

[0057] In a further preferred embodiment, the layer thickness of the additional material layer is selected such that eddy currents are formed by the magnetic field essentially only or exclusively in the additional material layer and not in the active component.

[0058] A further independent aspect for achieving the object relates to an electrically excited machine comprising a machine stator and an arrangement according to the invention, as described here. The electrically excited machine can be, for example, a synchronous machine or a transverse flux machine.

[0059] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0060] Embodiments of the invention are illustrated in the following drawings and explained in more detail in the following description. They show: Fig. 1 is a schematic sectional drawing of an embodiment of a machine according to the invention; Fig. 2 is a schematic sectional drawing of a first embodiment of an arrangement according to the invention along the longitudinal axis; Fig. 3 is a schematic sectional drawing of the first embodiment of a machine according to the invention transverse to the longitudinal axis; Fig. 4 is a schematic sectional drawing of a second embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 5 is a schematic sectional drawing of a third embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 6 is a schematic sectional drawing of a fourth embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 7 is a schematic sectional drawing of a fifth embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 8 is a schematic sectional drawing of a sixth embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 9 is a schematic sectional drawing of a seventh embodiment of an arrangement according to the invention along the longitudinal axis. Fig. 10 is a schematic sectional drawing of an eighth embodiment of an arrangement according to the invention along the longitudinal axis.

[0061] Fig. 1 shows a schematic sectional drawing of an embodiment of a machine 100 according to the invention with a first embodiment of an arrangement 1a. Fig. 2 shows a schematic sectional drawing of this embodiment of the arrangement 1a according to the invention along the longitudinal axis 21. Fig. 3 shows a schematic sectional drawing of this embodiment of the inventive According to the invention, the arrangement 1a is arranged transversely to the longitudinal axis 21 along the axis AA shown in Fig. 2. The machine 100 is an electrically excited machine, for example, an electrically excited synchronous machine. In the following, the terms "synchronous machine" and "synchronous machine rotor" are generally used, but this is not intended to be limiting. The following configurations and technical features can generally also be used in other electrically excited machines with a machine rotor.

[0062] Such a synchronous machine 100 comprises a synchronous machine rotor 10, a synchronous machine stator 40, and an excitation device. The synchronous machine 100 is designed as an internal rotor, i.e., the synchronous machine rotor 10 is spatially surrounded by the synchronous machine stator 40. In other words, the synchronous machine rotor 10 is arranged inside the synchronous machine 100, while the synchronous machine stator 40 is arranged outside the synchronous machine 100. In particular, the synchronous machine rotor 10 is arranged in a cavity of the synchronous machine stator 40. The synchronous machine rotor 10 has a synchronous machine rotor winding 15, which, due to its function within the electrically excited synchronous machine 100, is also referred to as the excitation winding 15. Accordingly, the synchronous machine stator 40 has a synchronous machine stator winding 45.

[0063] The excitation device serves to electrically excite the synchronous machine 100 or the synchronous machine rotor 10 of the synchronous machine 100. The excitation device comprises a power transmission system 20 integrated into the synchronous machine rotor 10. The synchronous machine rotor 10 has a synchronous machine rotor shaft 13 and the excitation winding 15. The power transmission system 20 of the excitation device is arranged in a cavity 12 of the synchronous machine rotor shaft 13.

[0064] According to the embodiment shown in Figs. 1 to 3, the energy transmission system 20 is a contactless or inductive energy transmission system. The energy transmission system 20 comprises or is a rotating energy transmission device. The energy transmission system 20 or the energy transmission device comprises an exciter stator 2 (primary side, preferably a primary coil) and an exciter rotor 4 (secondary side, preferably a secondary coil). The exciter rotor 4 spatially surrounds the exciter stator 2. In other words, the exciter stator is arranged inside the energy transmission system 20, while the exciter rotor is arranged outside the energy transmission system 20. In particular, the exciter stator 2 is arranged in a cavity of the exciter rotor 4. The energy transmission system 20 is thus designed as an external rotor.

[0065] The energy transmission system 20 is arranged in the synchronous machine rotor 10, in particular, such that the exciter rotor 4 is rotationally fixedly connected to the synchronous machine rotor 10. Thus, the exciter rotor 4 rotates with the synchronous machine rotor 10. In other words, the exciter rotor 4 and the synchronous machine rotor 10 are arranged and / or coupled or connected to one another such that the exciter rotor 4 and the synchronous machine rotor 10 are synchronized in their rotational movements. Consequently, the exciter rotor 4 and the synchronous machine rotor 10 have the same angular velocity and / or rotational speed in the operating state.

[0066] The excitation device is designed to transmit electrical energy contactlessly from the excitation stator 2 to the excitation rotor 4 of the excitation device, and finally from the excitation rotor 4 to the excitation winding 15 of the synchronous machine rotor 10. The excitation device further comprises an electronic device 6, 7, which is also arranged in the cavity 12 of the synchronous machine rotor shaft 13. In particular, the electronic device comprises one or more several capacitors and / or other electronics 7, in particular for compensating reactive power, and / or a rectifier 6, which is preferably arranged on a rectifier board. The rectifier can be a passive full-bridge rectifier, an active or passive half-bridge rectifier, or a mixed form (comprising an active transistor and a passive diode per branch), although other types of rectifiers can also be used in principle. With the aid of the rectifier 6, an alternating voltage transmitted by the energy transmission system 20 can be rectified in order to supply the excitation winding 15 of the synchronous machine rotor 10 with direct voltage or to feed direct current into the excitation winding 15 of the synchronous machine rotor 10 and thus generate a magnetic field.

[0067] The synchronous machine rotor 10 further includes (optionally, not necessarily) a magnetic flux guide element (not shown). Accordingly, the synchronous machine stator 40 further includes (optionally, not necessarily) a magnetic flux guide element (not shown). The magnetic flux guide element of the synchronous machine rotor 10 is arranged, for example, between the magnetic flux guide element of the synchronous machine stator 40 and the synchronous machine rotor shaft 13. The magnetic flux guide element serves to guide the magnetic flux on the synchronous machine rotor 10, and the magnetic flux guide element serves to guide the magnetic flux on the synchronous machine stator 40.

[0068] To reduce any losses, e.g., due to eddy currents and / or heating, the exciter stator 2 is preferably made of a material that is both magnetically non-conductive and electrically non-conductive (in particular, a plastic such as POM or PEEK or a fiber-reinforced plastic such as GRP). This is advantageously possible because no special stability requirements are imposed on the exciter stator 2 of the energy transmission system 20. The exciter stator 2 only needs to be capable of supporting windings. However, it is also possible to manufacture the exciter stator 2 from metal, such as steel or aluminum. In this case, it is advantageous to apply an additional highly conductive electrical layer to the exciter stator 2.

[0069] The arrangement 1a further comprises a cooling device for cooling the excitation device. This cooling device comprises an inlet channel 80 for a coolant extending along the longitudinal axis 21 of the energy transmission system 20 and a plurality of return channels 81, 82 for the coolant extending parallel to the longitudinal axis 21 of the energy transmission system 20.

[0070] The inlet channel 80 is formed, for example, in a hollow shaft 85, which is made, for example, of plastic so that it does not influence the magnetic field of the energy transmission system 20. The hollow shaft 85 preferably supports the exciter stator 2 and thereby increases the stability of the exciter stator 2. A coolant such as air, water, and / or oil is introduced from outside the arrangement through an inlet (an input opening) 83 into the inlet channel 80 in the hollow shaft 85. In addition, the hollow shaft 85 carries a bearing or a (e.g., metallic) bearing seat for a bearing located in the cavity 12.

[0071] The coolant was returned through the return channels 81, 82. One or more return channels 81 can be provided, which run in an air gap between the primary side (the exciter stator 2) and the secondary side (the exciter rotor 4) of the energy transmission system 20, i.e., the existing air gap can be used for the return of the coolant. Alternatively or additionally, one or more return channels 82 can be provided, which run between the secondary side 4 of the energy transmission system 20 and the machine rotor shaft 13.

[0072] To allow the coolant to escape or be discharged from the hollow shaft 12 of the machine rotor shaft 13, a further return channel 84, particularly in the area of ​​a bearing 18 of the machine rotor shaft 13, and / or one or more lateral outlet openings 86 (shown in dashed lines) are provided through the wall of the machine rotor shaft 13. For example, openings between the bearing 18 and the energy transmission system 20 are useful so that the coolant can escape radially outward. This allows the coolant to be used, if necessary, to cool winding overhangs or the excitation winding located radially outward. Such openings can also be advantageous when using oil spray cooling.

[0073] The cross-section shown in Fig. 3, transverse to the longitudinal axis 21, shows an exemplary design and arrangement of the various cooling channels. A support structure 23 can be seen, which is arranged between the secondary side 4 of the energy transmission system 20 and the machine rotor shaft 13. One or more of the return channels 82, preferably all of the return channels 82, run within this support structure 23. These return channels 82 are preferably arranged on the outer circumference of the tubular body of the support structure 23, whereby, in particular, hollow rotor shaft cooling can be realized, since the return channels and the coolant transported therein run along the inner wall of the machine rotor shaft 13 and / or a shield provided there. In another embodiment, at least a portion of the coolant is guided along the secondary coil 4 in order to dissipate its heat.The support structure 23 and the return channels running around the outer circumference achieve high radial support and torsional rigidity.

[0074] The cooling device further comprises a heat sink 90 connected to the electronic device 6, 7. The electronic device 6, 7 is completely or partially mounted on a rear side 91 of the Heat sink 90 and / or within heat sink 90. ​​For example, the electronic device comprises a circuit board 6, in particular with a rectifier and / or electronic components for communication and / or measurement detection, which is arranged on the rear side 91 of heat sink 90, in particular perpendicular or parallel to the longitudinal axis 21 of energy transmission system 20.

[0075] In the embodiment shown, the heat sink 90 has a blind hole 92 on its rear side 91, in particular a blind hole running along the longitudinal axis 21 of the energy transmission system 20. At least one electronic component 7 of the electronic device, for example a rectifier, parts of a rectifier, and / or electronic components for communication and / or measurement detection, is arranged on its inner circumferential surface 93 (and / or on its bottom surface 94). In particular, the arrangement on the inner circumferential surface 93 shown in Fig. 2 provides radial mechanical support for this part of the electronic device, which increases its mechanical strength, which is particularly advantageous at very high machine speeds.The elements of the electronic device attached to the heat sink 90 are thus thermally connected to the heat sink and are thus also cooled - indirectly through the heat sink 90 - by the coolant that impinges on the front side 95 of the heat sink 90 facing the energy transmission system 20.

[0076] Preferably, the front side 95 of the heat sink 90 is designed to deflect the coolant impinging from the inlet channel 80 to the return channels 81, 82, for example by having a concave surface, as shown in Fig. 2. As a result, the area of ​​the front side 95 onto which the coolant can impinge is also increased compared to a flat surface of the front side 95.

[0077] In the embodiment shown in Fig. 2, an element 90 provided separately from the machine rotor shaft 13 serves as the heat sink. Alternatively, a portion of the machine rotor shaft 13 itself can also serve as the heat sink if the machine rotor shaft 13 is designed accordingly.

[0078] According to the invention, the coolant thus effectively cools the energy transmission system 20, in particular the exciter stator 2, from the inside. Advantageously, this also cools the synchronous machine rotor 10 from the inside. Furthermore, the coolant also cools the heat sink 90, the elements 6, 7 of the electronic device thermally connected to the heat sink 90, and the secondary coil 4.

[0079] In the embodiment shown in Fig. 2, the energy transmission system 20, the heat sink 90 and the electronic device 6, 7 are arranged one behind the other in the cavity 12 of the machine rotor shaft 13, as seen from a coolant inlet opening 83 of the inlet channel 80 along the longitudinal axis 21 of the energy transmission system 20.

[0080] In an alternative embodiment, the arrangement can also be such that the electronic device 6, 7, the heat sink 90 and the energy transmission system 20 are arranged one behind the other in the hollow space 12 of the machine rotor shaft 13, viewed from a coolant inlet opening 83 of the inlet channel 80 along the longitudinal axis 21 of the energy transmission system 20. Fig. 4 shows a schematic sectional drawing of such an embodiment of the arrangement 1b according to the invention along the longitudinal axis 21. Unlike in the arrangement 1a, in the arrangement 1b a distance 87 is left between the hollow shaft 85 and the heat sink 90, which can also serve as a coolant channel for the return of the coolant. Furthermore, optionally in the end region of the A further lateral outlet opening 86' is provided in the cavity 12. The arrangement of the electronic device 6, 7 can otherwise be carried out as described above in connection with the arrangement 1a.

[0081] While the design of arrangement 1b allows for simpler and shorter cable routing, the design of arrangement 1a shown in Fig. 2 is preferred in terms of simpler assembly and reduced centrifugal forces due to smaller diameters and cooling.

[0082] A shield 24 for magnetic shielding of the energy transmission system 20 can also be arranged radially between the secondary side 4 of the energy transmission system 20 and the machine rotor shaft 13 or on the outer circumference of the machine rotor shaft 13. This shield 24 can also serve as an additional heat sink for cooling the machine rotor shaft 13 and / or the electronics, particularly if the latter is thermally connected to the shield.

[0083] The machine rotor shaft 13 can be made of a metallic material, for example, steel or aluminum. In a preferred embodiment, however, it can also be made entirely or partially of a non-metallic material, in particular plastic, fiber-reinforced plastic, ceramic, or fiber-reinforced ceramic.

[0084] In a further embodiment, two or more energy transmission systems can be arranged one behind the other in the hollow shaft 12. Both energy transmission systems can be used for electrical excitation, for example, to enable safer, stronger, or staggered excitation. Alternatively, one or more energy transmission systems can serve as data transmission systems.

[0085] The energy transmission system 20 comprises a primary side (stationary part or stator 2) and a secondary side (rotating part or rotor 4). The usual design, i.e., with an external stator and an internal rotor, is reversed in this case: The primary side of the energy transmission system 20 is located on the rotational axis or rotationally symmetrically around it inside the hollow shaft of the rotor. It is arranged as an extension of the rotational axis of the output shaft 13 of the synchronous machine 100 and is installed within the secondary side of the energy transmission system 20. The cable routing to the primary side runs radially inside the bearing 18, i.e., between the bearing 18 and the cooling channel 80, but can also run through one or more openings in a (bearing) cover on the non-drive side.

[0086] Fig. 5 shows a schematic sectional drawing of a further embodiment of an arrangement 1c according to the invention along the longitudinal axis. In this case, only the air gap 81 of the energy transmission system 20 is provided as a coolant return channel. However, additional coolant channels can also be provided, for example a coolant channel 82 as in the embodiments shown in Figs. 2 and 4. If the machine rotor shaft 13 is made of fiber-reinforced plastic material and is thus thermally insulating, additional coolant channels are preferably provided if they are advantageous for cooling the secondary coil 4. The coolant channels 82 are then preferably arranged directly outside (seen in the radial direction) on the secondary coil 4. Furthermore, a differently designed heat sink 90 is provided, which in the embodiment shown has a flat front side 95, but which can also be concave or designed to be flow- and cooling-optimized.

[0087] Preferably, cable guide channels 96 are also provided between the secondary coil 4 and the electronic device 6, 7 for the passage of cables between the electronic device 6, 7 and the rotor winding of the synchronous machine rotor. tors 10 or the energy transmission system 20. The elements 6, 7 of the electronic device are arranged within the blind hole 92 of the heat sink 90' and transfer their heat to the coolant flow via the heat sink 90'.

[0088] As can be seen particularly in Fig. 5, the windings of the rotating secondary side 4 are located internally. Furthermore, a magnetic flux guide (e.g., a deformable mat made of pressed ferrite composite) and / or a highly electrically conductive material (e.g., copper) can optionally be provided for radially outward shielding. The shield is preferably arranged radially outside the machine rotor shaft 13, since the machine rotor shaft 13 (made of fiber-reinforced plastic) behaves magnetically like air.

[0089] Such a shield 24 can be seen in the embodiment of the arrangement 1h shown in Fig. 10. The shield 24, for example in the form of a sleeve (e.g., a copper sleeve), is placed over the machine rotor shaft 13. The supply line of the secondary coil 4 can be routed through the space 25 between the machine rotor shaft 13 and the secondary coil 4 or the heat sink 90. ​​Alternatively or additionally, cooling channels can also be placed there.

[0090] Fig. 6 shows a schematic sectional drawing of another embodiment of an arrangement 1d according to the invention along the longitudinal axis. One or more circuit boards 6 of the electronic device are arranged parallel to the longitudinal axis 21 within the blind hole 92 of the heat sink 90. ​​The electronic components are preferably mounted on the respective circuit board 6 by means of SMD assembly. The inner contour (the blind hole 92) of the heat sink 92 can, for example, have the shape of a polygon, on whose straight surfaces the circuit boards 6 are arranged. The electronic components are thus radially supported on the circuit board, and the generated heat is thermally dissipated through the respective circuit board 6 to the heat sink 90.

[0091] Further modification options include not using a heat sink, but attaching the circuit board(s) 6 directly to the hollow rotor shaft 13 (are) and / or that the shielding 24 is used directly as a heat sink. Furthermore, flexible PCBs can be used as the circuit board(s), and the heat sink 90 can have a round inner contour rather than a polygon. The circuit board(s) 6 can be arranged both parallel and perpendicular to the longitudinal axis 21.

[0092] Fig. 7 shows a schematic sectional drawing of a further embodiment of an arrangement 1 e according to the invention along the longitudinal axis. In this embodiment, the heat sink 90 is designed such that the hollow channel 85 with the cooling channel 80 extends into the interior or a through-bore 97 of the heat sink 90. ​​The heat sink 90 is supported in the radial direction by support bodies 98, e.g., a support ring or a support bushing. The components 6, 7 of the electronic device, for example in the form of circuit boards, are arranged in the interior or a through-bore 97 of the heat sink 90 parallel to the longitudinal axis 21. The coolant flow runs, as indicated by arrows, radially inside the heat sink 90 to the left and outside the heat sink 90 through the support structure 98 back to the right. This allows for better cooling.

[0093] Fig. 8 shows a schematic sectional drawing of a further embodiment of an arrangement 1f according to the invention along the longitudinal axis. The machine rotor shaft 13 is designed as an open hollow shaft, which - viewed in the direction of the longitudinal axis 21 from the coolant inlet 83 - is open, i.e., the entire machine rotor shaft 13 is designed as a hollow shaft. This allows the coolant to be fed from the opening 14 into the cavity 12. The coolant then flows in the direction indicated by the arrows through the heat sink 90 and the energy transmission system 20 until it exits in the radial direction through the lateral outlet openings 86. The shaft 85 can then also be designed as a hollow shaft, or as a solid shaft without an internal channel. The heat sink 90 has a through-opening 97 in which the components 6, 7 of the electronic device and are supported radially outwards.

[0094] Fig. 9 shows a schematic sectional drawing of another embodiment of an arrangement 1g according to the invention along the longitudinal axis. In this embodiment, the machine rotor shaft 13 is also designed as a hollow shaft with an opening 14. However, unlike in the arrangement 1f, the coolant is supplied via the coolant supply 83 into the cooling channel 80 within the hollow shaft. The hollow shaft 85 has lateral, radially extending outlet openings 88 through which the coolant partially penetrates into the region of the cavity 12 upstream of the energy transmission system 20. From there, the coolant then flows through the coolant channels 81, 82. Another portion of the coolant flows through the continuation 80' of the cooling channel 80, which can optionally have a smaller diameter than the cooling channel 80, further toward the heat sink 90.From there, the coolant flows through the through-bore 97 into the open end region of the cavity 12 before exiting through the opening 14 and / or the lateral outlet openings 86' into the outer region.

[0095] In summary, the invention enables, in addition to contactless (particularly inductive) energy transfer, the integration of the electronics device and a hollow rotor shaft cooling system into the hollow rotor shaft of an electrically excited machine. The stator journal with the primary winding is stationary. The cooling medium inlet is integrated into the stator journal. The secondary winding is connected to the rotating shaft by means of a support structure. Recesses in the support structure ensure the return of the cooling medium. The shape is designed to maximize the surface area for the shielding connected to the rotor shaft. This enables the best possible cooling of the rotor shaft and thus of the entire rotor.

[0096] The heat sink of the electronics unit is located in the flow of the cooling medium, providing a cooling circuit that cools the coil system of the contactless energy transfer system, the electronics unit (especially the rectifier), the hollow rotor shaft, and thus the rotor itself. The integration of the heat sink minimizes the distances between the electrical components and the rotational axis. This significantly increases the speed stability.

[0097] In addition to the basic system design, the invention includes proposals for the mechanically and thermally optimized design and arrangement of the electronics device. These are preferably selected so that the electrical components are supported radially on the heat sink when rotating. This design has two significant advantages. First, the mechanical strength is significantly improved, allowing the concept to be used even in high-speed machines. Second, the contact with the heat sink simultaneously serves to dissipate heat from the components, resulting in extremely effective cooling. In addition to the aforementioned design, the circuit board can also be potted.

[0098] In summary, the present invention provides in particular a novel solution for the design of an electrically excited machine, in particular a synchronous machine, and an arrangement therefor, wherein the electrical energy is transmitted to the machine rotor without contact. The transmission system is advantageously wear-free, and a motor can require less installation space (particularly in the axial region). Furthermore, the electrically excited synchronous machine described within the scope of the present invention offers greater reliability and lower heat generation compared to conventional electrically excited synchronous machines, without the power density suffering. One possible application of the present invention lies, for example, in the field of electromobility, in particular as a drive motor for electric vehicles.

Claims

Patent claims 1 . Arrangement (1) for an electrically excited machine (100), comprising: a machine rotor (10); an excitation device (6, 7, 20) for electrically exciting the machine (100);and a cooling device (80, 81, 82, 90) for cooling the excitation device, wherein the excitation device comprises an energy transmission system (20) which is integrated in the machine rotor (10) and is designed to transmit electrical energy from a primary side (2) of the energy transmission system (20) to a secondary side (4) of the energy transmission system (20) without contact, and an electronic device (6, 7), wherein the machine rotor (10) has a machine rotor shaft (13) and the energy transmission system (20) and the electronic device (6, 7) of the excitation device are arranged in a cavity (12) of the machine rotor shaft (13), wherein the cooling device (80, 81, 82, 90) has an inlet channel (80) for a coolant extending along the longitudinal axis (21) of the energy transmission system (20) and a plurality of inlet channels (80) extending parallel to the longitudinal axis (21) ) of the energy transmission system (20) extending return channels (81, 82) for the coolant.; 2. Arrangement according to one of the preceding claims, wherein the return channels (81, 82) run between the primary side (2) and the secondary side (4) of the energy transmission system (20) and / or between the secondary side (4) of the energy transmission system (20) and the machine rotor shaft (13).

3. Arrangement according to one of the preceding claims, wherein a support structure (23) is arranged between the secondary side (4) of the energy transmission system (20) and the machine rotor shaft (13), in which one or more of the return channels (81, 82), in particular all return channels, run.

4. Arrangement according to one of the preceding claims, wherein the cooling device further comprises a heat sink (90) connected to the electronic device (6, 7).

5. Arrangement according to claim 4, wherein the electronic device (6, 7) is arranged wholly or partly on a rear side (91) of the heat sink (90) facing away from the energy transmission system (20) and / or within the heat sink (90).

6. Arrangement according to claim 4 or 5, wherein the electronic device (6, 7) has a circuit board (6), in particular with a rectifier and / or electronic components for communication and / or measurement detection, which is arranged on the rear side (91) and / or in the interior of the heat sink (90), in particular perpendicular or parallel to the longitudinal axis (21) of the energy transmission system (20).

7. Arrangement according to one of claims 4 to 6, wherein the heat sink (90) has a blind hole (92) on its rear side (91), in particular a blind hole running along the longitudinal axis (21) of the energy transmission system (20), on the inner circumferential surface (93) and / or bottom surface (94) of which at least one electronic component (7) or a circuit board of the electronic device, in particular a rectifier, parts of a rectifier and / or electronic components for communication and / or measurement detection, is arranged.

8. Arrangement according to one of claims 4 to 7, wherein the front side (95) of the cooling body (90) facing the energy transmission system (20) is designed to deflect the coolant impinging from the inlet channel (80) to the return channels (81, 82), in particular has a concave surface.

9. Arrangement according to one of claims 4 to 8, wherein a part of the machine rotor shaft (13) or an element (24, 90) provided separately from the machine rotor shaft (13) serves as a heat sink.

10. Arrangement according to one of claims 4 to 9, wherein the energy transmission system (20), the heat sink (90) and the electronic device (6, 7), viewed from a coolant inlet opening (83) of the inlet channel (80) along the longitudinal axis (21) of the energy transmission system (20), are arranged one behind the other in the cavity (12) of the machine rotor shaft (13).

11. Arrangement according to one of claims 4 to 9, wherein the electronic device (6, 7), the heat sink (90) and the energy transmission system (20) are arranged one behind the other in the cavity (12) of the machine rotor shaft (13), as seen from a coolant inlet opening (83) of the inlet channel (80) along the longitudinal axis (21) of the energy transmission system (20).

12. Arrangement according to one of the preceding claims, wherein a shield (24) is arranged between the secondary side (4) of the energy transmission system (20) and the machine rotor shaft (13) or on the outer circumference of the machine rotor shaft (13).

13. Arrangement according to one of the preceding claims, wherein the machine rotor shaft (13) consists entirely or partially of a non-metallic material, in particular plastic, fiber-reinforced plastic, ceramic or fiber-reinforced ceramic.

14. Arrangement according to one of the preceding claims, wherein a further return channel (84), in particular in the region of a bearing (18) of the machine rotor shaft (13), and / or one or more lateral outlet openings (86) through the wall of the machine rotor shaft (13) are provided for discharging the coolant from the cavity (12) of the machine rotor shaft (13).

15. An electrically excited machine (100) comprising: a machine stator (40); and an assembly (1) according to any one of the preceding claims.

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