DE102023116915A1 - Electric machine with rotor with intermediate disk for distribution of a cooling medium - Google Patents

Abstract

A first aspect of this disclosure relates to an electric machine with a rotor and with at least one intermediate disk,
which is arranged, in particular concentrically, around a rotor axis, wherein the intermediate disk is adapted to conduct a cooling medium to parts of the rotor.

Description

technical field

This disclosure relates to electrical machines with rotors having at least one intermediate disk for distributing a cooling medium. A corresponding manufacturing method for the intermediate disks is also disclosed.

background

Rotors are often cooled with gear oil, which is introduced axially into the interior of a rotor shaft, for example. In addition or alternatively, the use of a classic cooling medium, e.g. water- or glycol-based, is also conceivable. In many designs, the cooling medium exits the rotor - e.g. on both sides of the active part - and then cools the winding heads of the stator. Or the cooling medium is directed back towards a gearbox, e.g. with the help of a lance. An axial flow close to the heat source usually leads to asymmetric cooling of the rotor. If there is axial flow from both sides of the rotor, the cooling medium must be divided accordingly, and the cooling medium must also be directed outwards on both sides of the rotor. Both of these involve additional costs. Improvements are desirable in contrast.

General Description

An object of the present disclosure is to improve cooling of a rotor of an electric machine.

This object is achieved by the disclosed embodiments, which are particularly defined by the subject matter of the independent claims. The dependent claims present further embodiments. In the following descriptions, various aspects and embodiments of these aspects are disclosed, which provide additional features and advantages.

A first aspect of this disclosure relates to an electric machine with a rotor and with at least one intermediate disk,
which is arranged, in particular concentrically, around a rotor axis, wherein the intermediate disk is adapted to conduct a cooling medium to parts of the rotor.

Electrical machines that can be considered include electric drives and electric generators.

A rotor axis can be a real rotor axis, in particular if the electrical machine has an internally rotating rotor. Additionally or alternatively, a rotor axis can be a virtual rotor axis, in particular if the internally rotating rotor is hollow in the center or if the electrical machine only comprises an externally rotating rotor.

Intermediate disks can be used in different configurations for rotors for electric drives or for electric generators. Examples are intermediate disks for rotors of separately excited electrical machines, which are designed as winding aids for a round wire winding and/or as support rings to absorb centrifugal forces of the rotor winding heads.

An intermediate disk, also called an intermediate plate, is a component of an electrical machine that can be used to protect and support the internal structure and components of the motor. For example, the intermediate disk can be designed as a balancing disk. It can be located at least partially in the area of the rotor housing, in particular in the active part and/or in the laminated core. In particular, an intermediate disk can be arranged in such a way that it divides the rotor, or the parts that form the active length of the rotor, into two halves. Alternatively, several intermediate disks can be arranged in such a way that the rotor, or the parts that form the active length of the rotor, are divided into parts of equal length and/or symmetrically.

Additionally or alternatively, the intermediate disk can be designed to control a heat flow as part of the cooling system of the electrical machine. It can serve, for example, to dissipate heat from the internal components and enable heat exchange with the environment. In particular, an intermediate disk can have structures such as cooling channels, in particular between the intermediate disk and the rotor housing (lamination stack). Such structures can already be specified in a powder metallurgical process for producing the intermediate disk.

An intermediate disc can be made of one piece or several pieces (i.e. several parts).

By means of an intermediate disk designed to conduct a cooling medium, a flexible supply and removal of a cooling medium can be achieved and the cooling of a rotor of an electrical machine can thus be improved.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the intermediate disk at least partially comprises a sintered material.

A sintered material is a material that consists of fine powder particles. These can be bonded together by a sintering process. In particular, sintering can include a heat treatment process in which a material is heated below its melting point but above a certain temperature, the sintering temperature.

Components produced using powder metallurgy, soft iron particles that can be coated with a plastic layer for electrical insulation, are particularly suitable as sintering materials. This will be described in more detail later.

By using an intermediate disk that is at least partially made of sintered material, complex geometric shapes can be integrated into the intermediate disk.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the intermediate disk comprises a magnetically active material, in particular a soft magnetic composite material.

Various materials can be used as magnetically effective material. For example, steel, stainless steel, bronze and brass alloys as well as hard metals. In particular, an end plate can contain nickel (Ni), cobalt (Co), neodymium (Nd), gadolinium (Gd), magnetite (Fe3O4), alnico (an alloy made of aluminum, nickel and cobalt as well as iron and other elements), ferrite, and/or steel.

In one embodiment, the intermediate disk comprises a soft magnetic composite material.

Soft magnetic composites (often also called "soft magnetic composites", "SMC") are materials that are easily magnetized and demagnetized and have a low coercivity and/or high permeability. Soft magnetic composites can be formed to have good magnetic properties and consist primarily of ferromagnetic particles, often made from iron or iron-based alloys.

A soft magnetic composite material can be cast or pressed into complex shapes in the sintering process, which allows greater design freedom and the possibility of producing more compact and efficient intermediate disks. For example, closed or open cooling channels can be integrated into the intermediate disk. In addition or alternatively, the magnetic properties of the intermediate disk can be well defined. By adjusting the composition and processing conditions, the magnetic properties of a soft magnetic composite material can be well tailored to specific applications or parts of an intermediate disk.

A soft magnetic composite material can, for example, comprise pure iron powder. Iron powder has a high saturation magnetization and low cost.

Additionally or alternatively, a soft magnetic composite material may comprise one or more iron-silicon alloys. Advantageously, these alloys may have a higher electrical resistance and better magnetic permeability than pure iron.

Additionally or alternatively, a soft magnetic composite material may comprise one or more iron-cobalt alloys. These alloys have high saturation magnetization and good magnetic properties at high temperatures.

Additionally or alternatively, a soft magnetic composite material may comprise one or more iron-nickel alloys. These alloys, such as “Permalloy”, offer high magnetic permeability and low coercivity.

Additionally or alternatively, a soft magnetic composite material can comprise one or more amorphous and/or nanocrystalline alloys. These alloys are characterized by their non-crystalline atomic structure, which has a high electrical resistance and excellent magnetic properties, e.g. low core losses and high permeability. Examples include amorphous Fe-B-Si and nanocrystalline Fe-Cu-Nb-Si-B alloys.

Additionally or alternatively, a soft magnetic composite material may comprise one or more ferrites. Ferrites are ceramic materials consisting of iron oxide combined with other metal oxides such as manganese, zinc or nickel. Ferrites can have high electrical resistance and good magnetic properties. Examples of ferrites are manganese-zinc ferrite and nickel-zinc ferrite.

These are just a few examples of the wide range of materials used in soft magnetic composites, which can be used individually or in combination nated for an intermediate disk. If the electrical machine has several intermediate disks, these can be made of different materials and/or have different functions or structures.

By using an intermediate disk made of magnetically effective material, the intermediate disk can be added to the active length of the stator. This allows a reduction in installation space to be achieved with the same performance. Alternatively, a more powerful electrical machine can be made possible with the same installation space. Here, a reduction in the stator and/or rotor winding current and thus a reduction in losses is possible, particularly when considering predetermined load points (e.g. consumption cycle).

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the intermediate pane is at least partially insulated.

The isolated sections of the intermediate disk can in particular be sintered powder particles.

This insulating layer may comprise an organic and/or inorganic material, e.g. a polymer, oxide and/or phosphate. The insulating layer, e.g. on magnetic particles, can help minimize eddy current losses, which can lead to higher energy efficiency and lower core losses.

Organic insulation materials may include: epoxy resins, e.g. thermosetting polymers that provide good adhesion, mechanical strength and chemical resistance, phenolic resins, e.g. thermosetting polymers with good thermal stability and electrical insulating properties, polyesters, e.g. those that provide good adhesion and corrosion resistance, and/or polyurethanes.

Inorganic insulating materials may include: silica, which offers good thermal stability and electrical resistance and can be applied as a thin coating to the sections or particles, alumina, a ceramic material which offers good stability, hardness and high electrical resistance and can be used to coat magnetic particles using methods such as atomic layer deposition, phosphates such as iron phosphate, and/or magnesium oxide.

By means of an at least partially insulated intermediate disk, a conductor can lie directly against the intermediate disk and a necessary total insulation, which results in particular from the sum of the conductor insulation and the insulation of the intermediate disk, can be achieved.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the intermediate disk has one or more cooling channels which are arranged to be connected to one or more cooling channels in the rotor, in particular in a laminated core of the rotor.

Cooling channels in the rotor, in particular in the laminated core of an electrical machine, serve to dissipate the heat that is generated during operation of the electrical machine. Electric motors, for example, convert electrical energy into mechanical energy, with some of the electrical energy being lost in the form of heat. In order to avoid overheating and to keep the operating temperature of the motor within an acceptable range, cooling channels can serve to dissipate heat. Cooling channels can in particular be designed to conduct a gaseous or liquid coolant.

The cooling channels in the laminated core are usually designed as a series of slots or recesses in the laminations of the stator of the electrical machine. These channels allow the passage of the coolant, in particular a cooling liquid or a gas, e.g. air, to dissipate the heat.

The cooling channel(s) in the intermediate disk can be arranged in different configurations, depending on the specific requirements of the electrical machine and/or the cooling method. For example, they can be designed such that they are arranged straight and/or curved on one and/or more coolant channels in the rotor so that the coolant can be guided through the intermediate disk and rotor. For this purpose, the cooling channel(s) in the intermediate disk can be arranged straight and/or at an angle, e.g. at right angles. Additionally or alternatively, the cooling channels in the intermediate disk can be designed such that they are connected to spirally arranged cooling channels in the laminated core of the stator. For this purpose, the cooling channels in the intermediate disk can be arranged at least partially obliquely to the rotor axis.

By communicating with one or more cooling channels in the rotor, a flexible and effective distribution of a cooling medium over the intermediate disks can be achieved.

A transition of one or more coolant channels from an intermediate disk into a rotor can be sealed in particular by a seal on the side of the intermediate disk and/or on the side of the rotor. In particular, the seal can be integrated at least partially in a form-fitting manner into an intermediate disk and/or the rotor. This can be achieved in particular by a corresponding frame and/or by a recess in which the seal is inserted. Additionally or alternatively, a seal can also be attached to the intermediate disk or to the rotor by screw connections and/or by an adhesive connection.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the cooling channels of the intermediate disk have at least one section in which they lead radially to the rotor axis through the intermediate disk.

A section of a cooling channel of the intermediate disk that is aligned radially to the rotor axis is a section that is arranged essentially at right angles to the rotor axis. In particular, one or more cooling channels can be guided completely radially (or essentially radially) to the rotor axis. A section of one or more cooling channels or a complete cooling channel can be designed essentially radially, i.e. with a small axial component (e.g. an oblique bore). If the intermediate disk has several cooling channels, these can each be arranged essentially at the same distance and/or essentially symmetrically in the intermediate disk.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein one or more cooling channels of the intermediate disk are arranged as recesses on one side of the intermediate disk such that they form a closed channel with the rotor adjacent to the intermediate disk, in particular the laminated core.

The intermediate disk can be designed in such a way that it is closed off by a straight section of the rotor and the cooling channel is formed by a recess in the intermediate disk and the straight rotor section. This makes it easy to form a cooling channel without having to set specific specifications for the rotor or form more complex closed cooling channels in the intermediate disk. The recesses can be formed in a sintering process and/or by machining after the basic shape of the intermediate disk has been produced.

Additionally or alternatively, the rotor can also have a recess at the point where the intermediate disk has a recess for guiding a coolant, so that a closed cooling channel is formed when the intermediate disk rests against the rotor. This allows a larger cross-section of the cooling channel to be achieved and thus more coolant to be guided through the channel.

By means of cooling channels which are closed by the rotor, cooling of the rotor can be achieved as soon as a cooling medium is passed through the intermediate disc and not only later, when the cooling medium has been guided in a cooling channel of the rotor.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk, wherein the cooling channels of the intermediate disk are arranged alternately on both sides of the intermediate disk.

An alternating arrangement means that cooling channels are arranged on different sides of the intermediate disk. In particular, radial cooling channels can be arranged on different sides of an intermediate disk. In particular, cooling channels can be arranged alternately on different sides of an intermediate disk. In this case, an equal number of cooling channels can be arranged on each side of an intermediate disk. Laterally arranged cooling channels can in particular be partially open cooling channels which are closed off by the rotor, as previously described.

By arranging cooling channels alternately, coolant can be easily discharged to the rotor on both sides of the intermediate disk, e.g. to the rotor's laminated cores, thus achieving the same cooling performance on both sides. In addition, by arranging the cooling channels alternately on the sides of an intermediate disk, imbalances in the intermediate disk can be avoided or reduced.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein one or more cooling channels in the intermediate disc are arranged as closed channels in the intermediate disc.

Closed cooling channels can also be arranged laterally in the intermediate disk. Additionally or alternatively, closed cooling channels can be arranged centrally in the intermediate disk. Closed cooling channels can be formed in particular by drilling holes in a preform of the intermediate disk.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein one or more cooling channels of the intermediate disk extend to the radially outer side of the intermediate disk and are sealed there with a closure device, in particular a rotor bandage.

This allows the cooling channels to be formed as holes in the intermediate disk from the outside. The external outlets of the cooling channels can then be sealed with a rotor bandage or another sealing means so that the coolant cannot escape to the outside. In particular, one or more cooling channels can have an external outlet and an internal outlet.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the intermediate disk has a channel for distributing the cooling medium to one or more cooling channels, which channel is connected to these cooling channels and is arranged in particular concentrically to the rotor axis in the intermediate disk.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the channel for distributing the coolant is arranged on the inside of the intermediate disc and the channel is formed in particular together with the rotor shaft.

An embodiment of the first aspect of this disclosure relates to the electric machine with a rotor and with at least one intermediate disk,
wherein the rotor shaft has at least one hole through which a coolant channel in the rotor shaft is connected to one or more coolant channels in the intermediate disk.

This allows a coolant to pass through the rotor shaft into the intermediate disk, for example, and be passed on via the intermediate disk to the active part of the rotor, in particular a laminated core. The coolant is distributed during operation of the electrical machine in particular by centrifugal forces. The coolant can be removed, for example, via the cooling channels in the rotor.

A second aspect of this disclosure concerns an intermediate disc,
wherein the intermediate disk is adapted to conduct a cooling medium to parts of the rotor.

An intermediate disc can have one or more of the above-mentioned features.

A third aspect of this disclosure relates to a method for producing an intermediate disc,
wherein the method comprises steps for producing an intermediate disk according to any of the preceding aspects.

The method may comprise steps to produce an intermediate disk according to the first or second aspect.

Short description of the characters

• 1 - einen Rotor einer elektrischen Maschine mit einem Zwischenring nach einer Ausführungsform dieser Offenbarung;
• 2 - eine schnittähnliche Ansicht durch einen Rotor einer elektrischen Maschine mit einem Zwischenring mit einem seitlich angeordneten Kühlkanal nach einer Ausführungsform dieser Offenbarung;
• 3 - einen Zwischenring mit seitlich angeordneten, offenen Kühlkanälen nach einer Ausführungsform dieser Offenbarung;
• 4 - einen Zwischenring mit mittig angeordneten, geschlossenen Kühlkanälen nach einer weiteren Ausführungsform dieser Offenbarung.

Further advantages and features emerge from the following embodiments, some of which refer to the figures. The figures do not always show the embodiments to scale. The dimensions of the various features may be enlarged or reduced accordingly, in particular for the sake of clarity of the description. In this regard, the following shows, partly schematically:

• 1 - a rotor of an electric machine with an intermediate ring according to an embodiment of this disclosure;
• 2 - a sectional view through a rotor of an electrical machine with an intermediate ring with a laterally arranged cooling channel according to an embodiment of this disclosure;
• 3 - an intermediate ring with laterally arranged, open cooling channels according to an embodiment of this disclosure;
• 4 - an intermediate ring with centrally arranged, closed cooling channels according to a further embodiment of this disclosure.

In the following description, reference is made to the accompanying figures which form part of the disclosure and illustrate certain aspects by which the present disclosure can be understood. Like reference numerals refer to like or at least functionally or structurally similar features.

In general, a disclosure of a described method also applies to a corresponding device (or apparatus) for carrying out the method or a corresponding system comprising one or more devices, and vice versa. For example, if a specific method step is described, a corresponding device may include a feature for carrying out the described method step, even if this feature is not explicitly described or shown in the figure. In contrast, if, for example, a specific device is described on the basis of functional units, a corresponding method may include one or more steps for carrying out the described functionality, even if these steps are not explicitly described or shown in the figures. Similarly, a system may be equipped with corresponding device features or with features for carrying out a specific method step. The features of the various exemplary aspects and embodiments described above or below may be combined, unless expressly stated otherwise.

Detailed description of the figures

1 relates to a rotor with an intermediate disk for an electrical machine according to an embodiment of this disclosure. The rotor 100 has a rotor shaft 102 (in the middle of which the rotor rotation axis is located) that runs completely through the rotor. Spatial receptacles for the permanent magnets of the rotor 104 can be seen on the side in the active part of the rotor. The active area initially comprises two laminated cores 106, 108 in which permanent magnets are arranged. An intermediate disk 110 is arranged between the laminated cores 106, 108.

The intermediate disk 110 is manufactured in a sintering process in one piece or in multiple pieces and is made of a magnetically effective material, a soft magnetic composite material (SMC). The particles were provided with electrical insulation before the pressing process. The intermediate disk 110 is thus magnetically effective and electrically insulated, so that no large eddy current can form across the intermediate disk. In this design, the intermediate disk 110 contributes to the active length of the rotor. Cooling channels are arranged in the intermediate disk 110. These carry a coolant from the rotor shaft 102 to the laminated cores 106, 108.

2 shows a sectional view 200 of the rotor 100. The rotor axis or the rotor shaft 102 and the spatial receptacles for the magnets 104 can be seen. The laminated cores 106, 108 are spaced apart by the intermediate disk 110. A coolant 202 is supplied to the rotor via the rotor shaft 102. In the area of the intermediate disk 110, the coolant 202 is diverted within the rotor shaft 102 in a cooling channel 204. The coolant 202 is guided into the intermediate disk via an outlet hole 206 arranged in the rotor shaft 102. During operation of the electrical machine, this is achieved in particular by the centrifugal force, which drives the coolant 202 outwards towards the intermediate disk 110.

In the view of the intermediate disk 110, essentially a cooling channel 210 is visible. The cooling channel 210 is designed as an open cooling channel in the intermediate disk on the side facing the laminated core 106. The cooling channel 210 is closed off on the open side by the laminated core 106. The coolant can thus cool the interior of the rotor when it flows to the outer side of the rotor 100. On the outer side of the intermediate disk 110, which corresponds to the outer side of the rotor 100, the intermediate disk has a bore 212. The coolant is guided from the intermediate disk to laminated cores 106, 108 via the bore. The laminated cores in turn have cooling channels 214, 216, the opening of which matches the side openings of the bore 212. This allows the coolant to flow from the rotor shaft 102 via the intermediate disk 110 to the laminated cores 106, 108 (dashed line) and cool the rotor near the heat source(s).

3 is a perspective view of an intermediate disk 300 with laterally arranged cooling channels, as in the rotor 100 in 1 and 2 can be used. The intermediate disk 300 has spatial receptacles for permanent magnets 302 as well as holes 304 with which the intermediate disk can be screwed to the rotor. Alternatively, the holes can reduce the weight of the intermediate disk. The intermediate disk can be arranged in a form-fitting manner on the rotor shaft using the springs 312.

The intermediate disk also has six cooling channels 306. The cooling channels 306 are arranged alternately, alternately in the intermediate disk. The cooling channels are also designed as open cooling channels, which only become closed cooling channels when arranged between two laminated cores (e.g. the laminated cores 106, 108 in the rotor 100).

The inlet 306a of a cooling channel 306 arranged on the rear side of the intermediate disk is coupled to a coolant distribution channel 310 through which coolant from the rotor shaft in the intermediate disk is distributed to all cooling channels 306. The coolant distribution channel 310 is also designed as an open coolant channel, which is closed off by the rotor shaft and which distributes the coolant from the rotor shaft via the holes 206. Due to the coolant distribution channel 310, the intermediate disk 300 does not need to be aligned so that the coolant channels 306 are arranged exactly over the holes 206. To connect the coolant channels 306 of the intermediate disk with the coolant channels 214, 216 of the laminated cores, the intermediate disk has holes 306b. These correspond to the hole 212 of the intermediate disk 110 in 2 .

4 is a perspective view of a section of an intermediate disk 400 with centrally arranged cooling channels. The intermediate disk 400 has spatial receptacles for permanent magnets 402 as well as holes 404 with which the intermediate disk can be screwed to the rotor. It is generally constructed similarly to the intermediate disk 300 from 3 .

Furthermore, the intermediate disk 400 has cooling channels 406, which are arranged inside the intermediate disk and radially to the rotor shaft. The cooling channels 406 have an inlet opening 406a for coolants, which are arranged in an internal concentric recess of the intermediate disk. The size of the recess corresponds to the size of the rotor shaft, so that the intermediate disk can be arranged on the rotor shaft. The coolant is supplied via an internal coolant distribution channel 410 via the rotor shaft, as with the intermediate disk 300. During operation of the electrical machine, the coolant is guided outwards by the centrifugal forces in the cooling channel 406 and there guided through a bore 406b into corresponding cooling channels of the laminated cores lying on both sides of the intermediate disk, as shown in 2 is shown.

List of reference symbols

100

rotor

102

rotor shaft

104

magnets

106

first part of the sheet metal package

108

second part of the sheet metal package

110

intermediate disc

200

sectional rotor view

202

coolant

204

cooling channel

206

coolant outlet hole

210

side cooling channel

212

hole intermediate disc

214

cooling channel left sheet metal package

216

cooling channel right sheet metal package

300

intermediate disc

302

holders for permanent magnets

304

mounting holes

306

cooling channel

306a

cooling channel inlet

306b

drilling

310

coolant distribution channel

312

springs

400

intermediate disc

402

holders for permanent magnets

404

mounting holes

406

cooling channels

406a

entrance opening

406b

drilling

410

coolant distribution channel

Claims (15)

Electric machine with a rotor (100) and with at least one intermediate disk (110) which is arranged, in particular concentrically, around a rotor axis (102), wherein the intermediate disk is designed to conduct a cooling medium to parts of the rotor. The electric machine according to the preceding claim, wherein the intermediate disk (110) at least partially comprises a sintered material. The electrical machine according to one of the preceding claims, wherein the intermediate disk (110) comprises a magnetically active material, in particular a soft magnetic composite material. The electric machine according to one of the preceding claims, wherein the intermediate disk (110) is at least partially insulated. The electric machine according to one of the preceding claims, wherein the intermediate disk (110) has one or more cooling channels (210) which are arranged to be connected to one or more cooling channels (214, 216) in the rotor (200), in particular in a laminated core (106, 108) of the rotor. The electric machine according to the preceding claim, wherein the cooling channels (210) of the intermediate intermediate disk (110) have at least one section in which they lead radially to the rotor axis (102) through the intermediate disk. The electrical machine according to one of the two preceding claims, wherein one or more cooling channels (210) of the intermediate disk (110) are arranged as recesses on one side of the intermediate disk such that they form a closed channel with the rotor (200) adjacent to the intermediate disk, in particular the laminated core (106, 108). The electric machine according to the preceding claim, wherein the cooling channels (210) of the intermediate disk (110) are arranged alternately on both sides of the intermediate disk. The electrical machine according to one of the preceding claims, wherein one or more cooling channels (210) in the intermediate disk (110) are arranged as closed channels in the intermediate disk. The electric machine according to one of the preceding claims, wherein one or more cooling channels (210) of the intermediate disk (110) extend to the radially outer side of the intermediate disk and are sealed there with a closure device, in particular a rotor bandage. The electrical machine according to one of the preceding claims, wherein the intermediate disk (110) has a channel (310) for distributing the cooling medium to one or more cooling channels (306), which is connected to these cooling channels and is arranged in particular concentrically to the rotor axis (102) in the intermediate disk (300). The electric machine according to the preceding claim, wherein the channel (310) for distributing the coolant is arranged on the inside of the intermediate disk (300) and the channel is formed in particular together with the rotor shaft. The electric machine according to one of the three preceding claims, wherein the rotor shaft (102) has at least one hole (206) through which a coolant channel in the rotor shaft is connected to one or more coolant channels (206) in the intermediate disk (110). Intermediate disk for arrangement in an electrical machine with a rotor, wherein the intermediate disk (110) is adapted to conduct a cooling medium to parts of the rotor (100). A method for producing an intermediate disk, the method comprising steps for producing an intermediate disk (110) according to any one of the preceding claims.

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