WO2019183657A1

WO2019183657A1 - Stator

Info

Publication number: WO2019183657A1
Application number: PCT/AT2019/060106
Authority: WO
Inventors: Andreas EILENBERGER
Original assignee: Miba Aktiengesellschaft
Priority date: 2018-03-27
Filing date: 2019-03-27
Publication date: 2019-10-03

Abstract

The invention relates to a stator (1) for an electric machine, comprising multiple grooves for receiving a respective at least one electrical conductor, wherein, in addition to the at least one electrical conductor, a respective at least one coolant channel is arranged in at least several of the grooves, and a potting compound is arranged in the remaining volume of the grooves. At least several of the coolant channels are fluidically connected to one another in the region of at least one axial stator end surface (9) via at least one collection channel (10) having at least one collection channel wall (11).

Description

stator

The invention relates to a stator for an electric machine, having a plurality of grooves for receiving in each case at least one electrical conductor, wherein in at least some of the grooves in addition to the at least one electrical conductor in each case at least one Kühlmit telkanal and in the remaining volume of the grooves a potting compound is arranged ,

Furthermore, the invention relates to an electrical machine comprising a stator.

In addition, the invention relates to a method for producing a stator for an electric machine in which a plurality of grooves for receiving at least one electrical conductor are formed, wherein in at least some of the grooves in addition to the at least one electrical conductor in each case at least one coolant channel is formed and the remaining volume of the grooves is filled with a potting compound.

The invention also relates to a potting tool for filling grooves for receiving in each case at least one electrical conductor of a stator for an electrical machine with a potting compound comprising a core rod with which the potting compound can be displaced into the grooves as well as a plurality of Lormstäbe or Lormrohre to training of coolant channels can be introduced into the grooves.

Finally, the invention also relates to a device for introducing electrical conductors into a stator or rotor for an electric machine, comprising feed elements for the introduction of the electrical conductors in grooves of a laminated core for the production of the stator or rotor.

It is known that heat is generated in a stator of an electric machine during operation, on the one hand, in the laminated core and, on the other hand, in the windings. For this reason, stators are cooled, wherein in the prior art various designs of Kühlun conditions have been described. A very effective cooling is that which brings the cooling medium in the immediate vicinity of the heat sources. For example, DE 10 2014 213 159 A1 describes an arrangement for stator cooling for an electric motor, comprising a stator laminated core comprising a plurality of axially aligned stator laminations and a plurality of axially extending winding slots in the stator laminations for accommodating associated stator windings one of the stator laminations formed radial recess opens, wherein the Ra dialausnehmung communicates for supplying coolant with a pre-arranged on the stator lamination cooling liquid line.

The US 2011/0133580 Al describes a variant of a slot cooling, in which coolant channels are formed in the potting compound for the groove, which is introduced for insulation reasons. The advantage here is that no additional cooling ducts drilled who have to or appropriate piping must be provided for this. However, this publication leaves open how the cooling channels can be introduced into the further coolant supply.

The object of the present invention is to provide an improved slot-cooled stator for an electric machine.

The object of the invention is achieved in the stator mentioned above in that at least some of the Kühlmittekanäle in the region of at least one axial stator end face via at least one collecting channel with at least one collecting duct wall with each other Strö determination s are connected.

Next, the object is achieved with the above-mentioned electric machine, wherein the stator is formed according to the invention.

In addition, the invention is achieved by the method mentioned, after vorgese hen that at least some of the Kühlmittekanäle in the region of at least one axial Stator- stimfläche via at least one collecting channel, which is formed with at least one collecting channel wall, are fluidly connected to each other. The invention is also achieved with the casting tool mentioned above, wherein at least one cover is arranged, wherein in the cover a mold element for the formation of a collecting channel with which at least some of the coolant channels flow can be connected, is arranged.

In addition, the object of the invention is also achieved with the aforementioned device for introducing electrical conductors into a stator or rotor for an electric machine, in which additionally at least one feed element for the introduction of form bars or forming tubes in the grooves as a placeholder for the formation of Coolant channels is arranged.

The advantage here is that through the front-end distribution of the coolant to the Kühlmit telkanäle a compact way to supply coolant can be achieved in the grooves of a stator. This makes it possible to use the space available for the electrical machine for availably to increase the achievable power. It is thus easier to represent the integration of the cooling channels in the cooling system.

Through the introduction of the placeholder for the coolant channels already in the "Wickelma machine" for the introduction of electrical conductors, the process for the preparation of the stator of an electric machine can be significantly simplified, as an additional Ar beitsschritt omitted. In addition, the automated division of the groove volumes on the conductors and the placeholders for the coolant channels with less likelihood of misplacement can be realized.

According to a variant embodiment of the stator or of the method, it can be provided that the at least one collector channel wall at least partially consists of a polymer or is made at least partially from a polymer or its precursor so as to maximize the magnetic field of the electric machine during operation little influence. In addition, it can be used to improve the corrosion resistance of the cooling system.

According to a preferred embodiment of the stator or the method can be seen easily that the polymer is made of the potting compound for the grooves or that the at least one collecting duct wall is made of the potting compound for the grooves. It In this way, the material compatibility of the materials used in the stator can be improved, in particular with regard to different thermal expansions. In addition, this can improve the cost-effectiveness of the process and thus reduce the manufacturing costs of the stator.

It is also advantageous if, according to a further embodiment variant of the stator or of the method, the at least one collecting channel wall and the potting compound are formed in one piece in the grooves or in one piece. It can thus be improved system integrity. In particular, so that leaks can be better avoided.

As an additional effect, the at least one collecting channel wall can be used as protection for the stator according to a further embodiment, for which it can be provided that the at least one collecting channel wall, the stator end face completely covers.

According to another embodiment of the stator can be provided that the Sam melkanal is designed as an annular channel, whereby this is easier to produce from the potting compound or a polymer or its precursor.

According to further embodiments of the stator, the at least one collecting duct wall can also be used to pour therein a contact for the electrical conductors and / or a temperature sensor, whereby a further reduction of the manufacturing costs of the stator can be achieved. With the help of the temperature sensor also a vorbestimm ble temperature level of the stator can be maintained during operation by this is integrated into a corresponding regulation or control of the stator cooling.

Preferably, in the method for forming the coolant channels before Einbrin conditions of the potting compound shape rods or mold tubes introduced into the grooves, and in addition also introduced before the introduction of the potting compound, the electrical conductors in the grooves. There are thus no placeholder for the introduction of electrical conductors in the grooves required.

In this case, according to a further embodiment variant of the method, the shaped rods or molding tubes for the formation of the coolant channels are introduced in a device in which Also, the electrical conductors are introduced into the grooves. As outlined above, so that an additional workstation can be saved, whereby the procedural rensablauf can be simplified.

According to a further embodiment variant, it can be provided that the form rods or the shaping tubes are introduced into the grooves after the electrical conductors or simultaneously with the electrical conductors. It is thus possible, by the introduction of the form of rods or the molding tubes, the electrical conductors within the grooves still slightly shift, so that at the same time with the introduction of the form of rods or molding tubes, a positioning of the electrical conductors can be done in the grooves.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In a simplified, schematic representation:

1 shows a stator in view in the axial direction.

Figure 2 shows a detail of a stator in the region of a groove for receiving the electrical rule ladder.

3 shows a section of a variant of the stator in the region of a groove for receiving the electrical conductors;

4 a stator cut in side view;

5 shows a variant of the stator in an end view;

Fig. 6 shows a variant of a Vergusswerkzeuges in partial section.

By way of introduction, it should be noted that in the differently described embodiments identical parts are provided with the same reference numerals or the same component designations. the, wherein the disclosures contained in the entire description mutatis mutandis to equivalent parts with the same reference numerals or the same component names transferred who can. Also, the position information chosen in the description, such as above, un th, laterally, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

In Fig. 1, a stator 1 for an electric machine in end view is shown. The electric machine is in particular a motor or a generator.

In principle, such electrical machines as well as the stators used for this purpose are known from the prior art, so that reference is made to further details on this schlägi conditions according to the prior art. At this point, for the sake of completeness, only so much is mentioned that the electric machine preferably also comprises a rotor, which is arranged to form an air gap to the stator 1 in the electric machine. The rotor may for example be arranged rotationally fixed on a shaft. Due to the generated in the operation of the electric motor as an electric motor is generated due to the generated Mag netfelder the rotor in a rotary motion. However, the stator 1 can in principle also be used without a rotor for generating a rotating field.

The rotor itself may be designed according to the prior art.

The stator 1 comprises a number of in a axial direction 2 (Fig. 4) successively arranged sheet metal elements 3 (in particular electrical sheets), which are connected together to form a Blechpa ket, as is known per se. In these sheet metal elements 3 4 inwardly open grooves 5 are formed in a Ra dialrichtung. The exact number of grooves 5 depends on the desired size or power of the electric machine.

The grooves 5 may have a variety of cross-sectional shapes (viewed in the direction of the axial direction 2), as indicated in Fig. 1 by means of grooves 5, which are shown in the lower left Quadran th. For example, the grooves 5 may have a round, an oval, a rectangular, a square, a trapezoidal, etc. cross-sectional shape. It should be noted, however, that the grooves 5 of a stator 1 preferably all have the same cross-sectional shape, although mixed variants are possible with at least two under different cross-sectional shapes.

The grooves 5 are formed open in the radially inner end region. Preferably, this Be is performed rich on the narrowest, so that the grooves 5 so in the radial direction 4 are wider towards the outside (each viewed in cross-section in the radial direction 4).

The grooves 5 serve to receive at least one electrical conductor 6 per groove 5. The electrical conductors 6 form the stator windings. These are indicated in Fig. 1 only in a groove 5.

The electrical conductors 6 may be made of a wire. The wire can, for example, therefore, be round wire (FIG. 1) or flat wire (FIG. 2). Likewise, the stator windings 6 may preferably be designed as so-called hair pins or I pins.

Per groove 5, one or more electrical conductors 6 may be provided, as indicated by four electrical conductors 6 by way of example in Figs. 1 or six electrical conductors 6 at play in Figs. 2 and 3. However, the number of electrical conductors 6 shown in detail is not intended to be restrictive. Next, the position shown in the figures konk ret and their orientation of the electrical conductor 6 within the grooves 5 is not restrictive to understand.

In addition to the electrical conductors 6, in each case at least one coolant channel 7 is arranged in at least some of the grooves 5, preferably in all the grooves 5. These Kühlmittelka channels 7 serve to receive a cooling fluid, in particular a cooling liquid which flows through these coolant channels 7 for cooling the stator 1.

If required, it is also possible for a plurality of coolant channels 7 to be arranged in at least one of the grooves 5, for example two or three, which may also be flowed through in different directions by the cooling fluid. The exact location of the coolant channel 7, as shown in the figures, is not to be understood as mitierierend. Likewise, the illustrated cross-sectional shape is not limited to ver. The coolant channels can be circular, oval, rectangular, square, etc. (each viewed in cross-section in the radial direction 4).

Preferably, the at least one coolant channel 6 is in the groove 5 subsequent to the ra dial inner beginning of the groove 5 (in particular in the radial direction 4 to the outside and subsequently ßend to the narrowed portion of the groove 5), as shown in Fig. 2, or in the groove 5 and (immediately) adjacent to the radially outer groove bottom, as shown in Fig. 3, arranged or formed.

Preferably, the stator 1 is produced by full potting, as will be explained nä ago hereafter. Here, the space between the electrical conductors 6 is filled in the grooves 5 with a potting compound 8, as shown with reference to a section of the stator 1 in the region of a groove 5 in Fig. 2 and Fig. 3. The potting compound may correspond to the prior art, for example, be a thermosetting casting resin. Examples of the type of casting resins are polyester resins, epoxy resins, etc.

It is now provided that at least some of the Kühlmittekanäle 7, preferably all coolant channels 7, in the region of at least one axial stator end face 9 via at least one collecting channel 10, which has at least one collecting channel wall 11, ver together, as shown in FIG. 3 can be seen is.

The at least one collecting channel 10 serves to supply the cooling fluid to the coolant channels 7. After the cooling fluid via the collecting channel 10 on the coolant channels 7 ver shares, this can also be referred to as a distribution channel.

Although it is possible in principle that the cooling fluid is withdrawn from the coolant channels 7 on the at least one collecting channel 10 along the axial direction 2 opposite end of the stator 1 individually per coolant channel 7, an embodiment is preferred in which at this other end a collection channel 10 is arranged with at least one Sam melkanalwand 11, in which the cooling fluid for further removal, for example, is collected to a heat exchanger of the cooling system, as shown in Fig. 3. At least individual, in particular all, coolant channels 7 extend from the collecting channel 10 at one end face of the stator 1 through the grooves 5 in the sheet metal elements 3 in the axial direction 2 and open into the second collecting channel 10 at the other end of the stator 1. The coolant channels 7 are preferably formed exclusively by the groove filling, so in particular the potting compound 8, ie there are no dedicated pipe or hose lines are provided for this purpose. Thus, the side walls of the cooling medium channels of the groove filling, in particular the potting compound 8 are formed.

In principle, it is possible, although not preferred, for the coolant channels 7 to be formed by separate pipe or hose lines which are introduced into the grooves 5 before they are filled.

In the embodiment of the stator 1 described above, the cooling fluid flows from one end face to the other end face of the stator 1 and then leaves the stator 1 at this end face. The supply and removal of the cooling fluid to and from the stator 1 thus takes place on different sides of the stator 1 However, there is also the possibility that the cooling fluid is deflected at one end face of the stator 1 and again flows through the stator 1 in the opposite direction. The supply and the removal of the cooling fluid can therefore also take place on an end face of the stator 1. For this case, only a few of the coolant channels 7, in particular each half of the total number, connected to the respective collecting channel 10 for the supply or the discharge of the cooling fluid on the two end faces of the Sta gate. The collecting channel 10 for the supply of the cooling fluid to and the collecting channel 10 for the removal of the cooling fluid from the coolant channels 7 are arranged on an end face of the stator 1. On the second end face of the stator 1, a further collecting channel 10 may be located. However, there is also the possibility that the coolant channels 7 have at this two th end face of the stator 1, a deflection, so for example, U-shaped out forms.

Although the preparation of the collecting channel 10 and the collecting channels 10 from the potting compound 8, with the grooves 5 are poured, the preferred embodiment of the stator 1, for the preparation of a polymer or its precursor can be used ver generally. It is also possible for the filling of the grooves 5, a polymer or its precursor is used, in particular the polymer that may optionally be used for the production of the at least one collecting channel 10. In the case of the use of a precursor for the polymer, this polymerized after filling the grooves 5 who the. The potting compound 8, however, is usually crosslinked.

For the purposes of the invention, a polymer is understood to mean a material consisting of organic, synthetic or natural, macromolecules of interconnected monomers.

However, there is also the possibility that the polymer or potting compound 8 additives are added, such as ceramic or metal filaments, so as to stiffen the To reach collecting duct side wall 11. Likewise, other stiffening elements, such as lattice-shaped or rod-shaped stiffeners, can be embedded in the collecting duct side wall 11.

The collecting channel 10 or the collecting duct wall 11 can be produced as a separate component and then connected to the coolant channels 7. However, it is preferred that at least one collection channel 10, i. the at least one collecting channel wall 11, with the cooling medium channels 7, i. with the potting compound 8 of the grooves 5, formed in one piece.

The at least one collecting channel wall 11 and the collecting channel walls 11 can cover only a portion of the stator end face (s) 9, so that therefore the end plates of the laminated core of the stator 1 are still partially visible when viewed in the direction of the axial direction 2. Preferably, however, is provided according to a variant of the stator 1, that at least one collecting channel wall 11, the stator end face 9 completely covers, as shown in Fig. 5. For reasons of clarity, the representation of the grooves 5 was omitted in Fig. 5 ver. However, the collection channel 10 and the end of the coolant channels 7 can be seen in dotted lines.

FIG. 5 also shows a further preferred embodiment of the stator 1, in which the at least one collecting channel 10 is designed as an annular channel. In principle, the Sammelka signal 10 but also have a different, suitable shape. With regard to the cross-sectional shape of the collecting channel 10 (viewed in the direction of a circumferential direction 12 of the stator 1), so the open cross-sectional area between the at least egg nen collecting channel wall 11, this circular, oval, square, rectangular, etc. can be out leads.

According to further embodiments of the stator 1 can be provided that at least one further component is embedded in the at least one collecting channel wall 11. For example, a contact for the electrical conductors 6 and / or at least one tempera ture sensor 14 are poured into the at least one collecting channel wall 11. The Kontaktie tion 13 and the temperature sensor 14 are shown in Fig. 5 only indicated by dashed lines.

As stated above, according to the method for manufacturing the stator 1 for an electric machine, it is preferably provided that at least a plurality of the grooves 5 for receiving the electrical conductors 6 coolant channels 7 are formed by pouring the grooves 5 with the potting compound 8, and in that at least some of the coolant passages 7 in the region are connected to one another at least one of the axial stator stop surfaces 9 via the at least one collecting channel 10. For the production of the collecting duct wall 11, a polymer or its precursor or, in particular, the potting compound 8 can be used to fill in the grooves 5.

The pouring of the grooves 5 is preferably carried out in Vollvergussverfahren. In this case, as shown in Fig. 6, which is provided with the electrical conductors 6 (Fig. 2 and 3) provided Blechpa ket in a casting tool 15. The potting compound 8, so in particular a synthetic resin, u.a. filled in a stator center 16 and then by inserting a core rod 17 in the stator center 16 in the grooves 5 (Fig. 1) urged. In order to fill the grooves 5 pores free, preferably a low-viscosity, degassed potting compound 8 is used. Additionally or alternatively, the method for further reduction of Luftein conclusions can also be performed under vacuum, including the casting tool 15 can be placed in a corresponding device for evacuation.

In order to be able to produce the coolant channels 7 (FIG. 2) simultaneously with the filling of the grooves 5 with the potting compound 8, mold bars 18 or molding tubes or tubes are inserted into the grooves 5. correspondingly shaped cores (generally also referred to as placeholders) inserted, which are removed after filling the grooves 5 with the potting compound 8 again, as soon as the potting compound 8 has the necessary strength to it. The mold bars 18 or molding tubes or cores may for example consist of polytetrafluoroethylene or have such Be coating.

As already stated, the at least one collecting channel wall 11 and thus the Sam melkanal 10 can be made separately and connected to the coolant channels 7, for example, glued be.

In the preferred embodiment of the method for producing the stator 1, however, the at least one collecting channel wall 11 is provided together with the coolant channels 7 ago, so made in one piece with it. The potting tool for this purpose may have a cover 19, in which at least one mold element 20 for the formation of the at least one collecting channel 10 and the at least one collecting channel wall 11 is arranged or ausgebil det.

If in each case at least one collection channel 10 is to be formed on both stator end faces 9 of the stator 1, the casting tool 15 may have a further such cover 19. This can also be formed by the bottom of the Vergusselementes 15.

In general, the grooves 5 can also be filled with another method with the potting compound 8 ge, for example by means of hot dipping or trickling. However, the full potting method is preferred.

The collecting channel 10 and the collecting channels 10 are preferably formed as closed channels. But there is also the possibility of this e.g. Make in the form of a half shell and then close it with another half shell.

Furthermore, the collecting channel 10 or the collecting channels 10 preferably each have at least one connection 21 (FIG. 4, FIG. 5) for the supply or removal of the cooling fluid into or out of the collecting channel 10 or collecting channels 10, respectively at different Places can be placed, as shown by two examples in the figures.

It is preferably provided that for the formation of the coolant channels 7 before Einbrin conditions of the potting compound in the grooves 5, the mold rods 18 or molded tubes into the grooves 5 is introduced, and that additionally before the introduction of the potting compound in the grooves 5, the electrical conductors be introduced into the grooves 5.

According to one, gegebebenfalls pending, variant of the invention it can be provided that the form of bars 18 or mold tubes for the formation of the coolant channels 7 are introduced in a device in which the electrical Lei tern 6 are introduced into the grooves 5. This device may for example be any known, but adapted for the introduction of the forming tubes winding machine. If, instead of a winding, pins are used as electrical conductors 6, this device can be a corresponding machine, as it is used for inserting the pins into the stator laminations.

Especially with the use of winding machines for pin or rod technology (sometimes referred to as a plug-in winding) is the way of introducing the electrical conductors 6 together with the placeholders for the coolant channels or corresponding cooling pipes advantageous.

The device for introducing the electrical conductors 6 in a stator or rotor for the electric machine can be carried out conventionally per se, and accordingly have to guide elements for the introduction of the electrical conductors 6 in the grooves 5 of a laminated core for the manufacture of the stator or rotor. In addition, the device has at least one feeding element for the introduction of form bars 18 or forming tubes into the grooves 5 as a placeholder for the formation of coolant channels 7, starting from the deviation from the Vorrichutngen known from the prior art. If only one feed element is used, all grooves 5 can be equipped with the placeholders at the same time.

For this purpose, the feed element can have a number of fingers corresponding to the grooves 5, on which the form bars 18 or shaping tubes are arranged. The relative position of the fingers to each other depends on the position of the grooves 5 in the laminated core. Alternatively, however, it is also possible for the shaping tubes or shaped rods 18 to be introduced into the grooves 5 individually or in groups, with the result that a correspondingly larger number of feed elements are also present here. The groups each comprise only a fraction of the total number of molding tubes or mold bars 18, wherein the sum of all groups Grup the total number of mold tubes or mold bars 18 results.

In principle, it can be provided that the electrical conductors 6 are introduced into the grooves 5 in the latter after the arrangement of the shaped rods 18 or the molding tubes. According to a preferred embodiment, however, it may be provided that the shaped rods 18 or shaping tubes are introduced into the grooves 5 after the electrical conductors 6 or simultaneously with the electrical conductors 6. In this case, the individual grooves 5 can be successively filled with the electrical conductors 6 and the form bars 18 or forming tubes or divided into groups at the same time or all grooves 5 are filled simultaneously.

The embodiment of the method, according to which the form of bars 18 or forming tubes are introduced into the device in which the electrical conductors 6 are introduced into the grooves 5, can represent a separate invention, so they run without the aforementioned collection channel 10 can be. Thus, the inven tion also includes a method for producing a stator 1 for an electric machine in which a plurality of grooves 5 for receiving at least one electrical conductor 6 are ausgebil det, wherein in at least some of the grooves 5 in addition to the at least one electrical conductor 6 each at least one coolant channel 7 is formed and the remaining residual volume of the grooves 5 is filled with a potting compound 8, wherein the form of bars 18 or molding tubes for the formation of the coolant channels 7 are introduced in a device in which the electrical conductors 6 in the Grooves 5 are introduced. The embodiment according to which at least some of the coolant passages 7 in the region of at least one axial Statorstimfläche 9 via at least one collecting channel 10, which is formed with at least one Sammelkanal- wall 11, connected to each other forms a preferred, but not mandatory Au sführungs variant of the procedure. Dement speaking are also the other embodiments described above to this possibly independent invention, after which the at least one collecting duct 10 optional is also applicable. To avoid repetition, reference is therefore made to the preceding statements.

The embodiments show possible embodiments, it being noted at this point be that combinations of the individual variants are possible with each other, please include.

For the sake of order, it should finally be pointed out that to better understand the structure of the stator 1, this is not necessarily shown to scale.

Reference numeral Stator

axially

sheet metal element

radial direction

groove

ladder

Coolant channel

potting compound

Statorstimfläche

collecting duct

Collecting duct wall

circumferentially

contact

temperature sensor

Potting tool

stator center

core rod

shape bar

cover

forming element

connection

Claims

Patent claims

A stator (1) for an electrical machine, comprising a plurality of grooves (5) for receiving at least one electrical conductor (6), wherein in at least some of the grooves (5) in addition to the at least one electrical conductor (6) respectively a Kühlmit telkanal (7) and in the remaining volume of the grooves (5) is a potting compound (8) is arranged, characterized in that at least some of Kühlmittekanäle (7) in the region of at least one axial Statorstimfläche (9) via at least one collecting channel (10 ) are connected to at least one collecting channel wall (11) flow together s.

Second stator (1) according to claim 1, characterized in that the at least one collecting duct wall (11) at least partially consists of a polymer.

3. stator (1) according to claim 2, characterized in that the polymer of the potting compound (8) for the grooves (5) is made.

4. stator (1) according to one of claims 1 to 3, characterized in that the at least one collecting channel wall (11) and the potting compound (8) in the grooves (5) are integrally formed.

5. stator (1) according to one of claims 1 to 4, characterized in that the at least one collecting channel wall (11), the stator end face (9) completely covers.

6. stator (1) according to one of claims 1 to 5, characterized in that the collecting channel (10) is designed as an annular channel.

7. stator (1) according to one of claims 1 to 6, characterized in that a contact (13) for the electrical conductors (6) in the at least collecting channel wall (11) is cast.

8. stator (1) according to one of claims 1 to 7, characterized in that at least one temperature sensor (14) is cast in the at least one collecting channel wall (11).

9. Electrical machine comprising a stator (1), characterized in that the stator (1) is designed according to one of claims 1 to 8.

10. A method for producing a stator (1) for an electrical machine, in which a plurality of grooves (5) for receiving at least one electrical conductor (6) are formed, wherein in at least some of the grooves (5) in addition to the at least one electrical conductor (6) in each case at least one coolant channel (7) is formed and the remaining volume of the grooves (5) with a potting compound (8) is filled, characterized in that at least some of Kühlmittekanäle (7) in the region at least one axial Statorstimfläche (9) via at least one collecting channel (10), which is formed with at least one collecting channel wall (11), are interconnected.

11. The method according to claim 10, characterized in that the collecting channel wall (11) is at least partially made of a polymer or its precursor.

12. The method according to claim 10 or 11, characterized in that the at least one collecting channel wall (11) from the potting compound (8) for the grooves (5) is produced.

13. The method according to claim 12, characterized in that the at least one collecting duct wall (11) is produced in one piece with the casting of the grooves (5) from the potting compound (8).

14. The method according to any one of claims 10 to 13, characterized in that for the formation of the coolant channels (7) before the introduction of the potting compound in the Nu th (5) Lormstäbe (18) or Lormrohre are inserted into the grooves (5), and that additional Lich before the introduction of the potting compound in the grooves (5), the electrical conductors (6) are introduced into the grooves (5).

15. The method according to claim 14, characterized in that the shaped rods (18) or molding tubes for the formation of the coolant channels (7) are introduced in a device in which the electrical conductors (6) are introduced into the grooves (5).

16. The method according to claim 14 or 15, characterized in that the

Form bars (18) or forming tubes after the electrical conductors (6) or simultaneously with the electrical conductors (6) are introduced into the grooves (5).

17. casting tool for filling grooves (5) for receiving in each case at least one electrical conductor (6) of a stator (1) for an electrical machine with a potting compound (8) comprising a core rod (17), with which the potting compound (8 ) can be displaced into the grooves (5), and a plurality of form bars (18) or forming tubes, the training for coolant channels (7) in the grooves (5) can be introduced, characterized in that further at least one cover (19 ), wherein in the cover (19) a mold element (20) for forming a collecting channel (10), with which at least one individual of the coolant channels (7) flow s can be connected, is arranged.

18. A device for introducing electrical conductors (6) into a stator (1) or rotor for an electric machine, comprising feed elements for the introduction of the electrical conductors (6) in grooves (5) of a laminated core for the production of the stator (1). or rotor, characterized in that in addition at least one supply element for the introduction tion of form bars (18) or forming tubes in the grooves (5) is arranged as a placeholder for the formation of coolant channels (7).