Insulation rings, stators and motors

Abstract

The invention relates to an insulating ring for a stator (10), in particular for a winding head of a stator (10), in particular for a winding assembled with strip conductors, the insulating ring comprising at least one first wall (11), which is formed by a first hollow cylinder (12), wherein partitions (13) are arranged in a star shape on the surface of the first wall (11), the partitions being formed of an electrically insulating material, wherein the partitions (13) extend from the end side of the stator over the axial height of the winding head.

Description

Technical Field

[0001] The invention relates to an insulating ring. In addition, the invention relates to a stator and an electric motor. Background Art

[0002] DE 10 2015 216 322 A1 discloses a plastic cover for a winding head of a stator. The plastic cover is designed to be disc-shaped and is arranged in the region of the axial end of the winding head. A receptacle for an electrical conductor of the winding head is arranged on the end side of the plastic cover. The purpose of the receptacle is to insulate the electrical conductors from each other.

[0003] WO 2017 / 121520 discloses an electric motor with a stator. The stator comprises a rotating field winding, which forms a winding head on each end side, wherein the winding head is embedded in a heat-conducting potting material. As a result, the windings are mechanically fixed on the one hand and electrically insulated from each other on the other hand.

[0004] It is also known from the prior art to insulate the strip conductors of a stator from one another by means of insulating paper.

[0005] Casting the winding head with resin requires a separate production step and therefore a separate device, which is used only for this purpose. This results in additional costs for operation and maintenance of the device. In addition, additional time must be spent for the production steps and reprocessing. Insulating the strip conductors with insulating paper is also time-consuming. In addition, direct cooling of the winding head, in particular the conductive elements of the winding head, is not provided in the above-mentioned prior art or is impossible. Summary of the invention

[0006] The object of the present invention is therefore to provide an insulating ring for a stator which provides reliable winding head insulation, in particular with cooling, for a winding assembled from strip conductors without requiring additional, complex production steps.

[0007] An electric motor.

[0008] According to the present invention, the purpose

[0009] - in terms of insulating rings, by means of insulating rings for stators according to the invention,

[0010] - on the stator side by means of a stator according to the invention comprising insulating rings,

[0011] - and in terms of the electric motor, this is achieved by an electric motor according to the invention having a stator.

[0012] In particular, the object is achieved by an insulating ring for a stator, the stator comprising a winding assembled with strip conductors, wherein the winding forms a winding head. The insulating ring comprises at least one first wall, which is formed by a first hollow cylinder, wherein webs are arranged in a star shape on the surface of the first wall, the webs being made of an electrically insulating material. The webs extend from the end side of the stator at the axial height of the winding head.

[0013] The insulating ring is arranged on the end side of the stator. The area of ​​the electrical winding that axially protrudes from the stator on the end side of the stator is called the winding head. The winding head includes a strip conductor. The strip conductor can be understood as an electrical conductor that is embedded or pulled into the slot of the laminated core. The strip conductor can be one-piece (single-strand conductor) or multi-piece (litter wire) and designed in the shape of, for example, a hairpin (hairpins) or an I-shape (I-pins). The strip conductor can also be constructed in particular as a shape-pressed or twisted stranded wire. The stator end side is understood to be an end face formed by the axial end of the stator, in particular by the end of the stator laminated core.

[0014] The strip conductors have contact areas, via which they are connected in pairs to form half coils. The strip conductors can be connected or connectable directly (bent and welded to each other) or indirectly (via end connectors / connecting tabs). Preferably, the strip conductors extend straight into the winding head. The star-shaped partitions of the insulating ring are arranged between the strip conductors in the assembled state. The partitions extend from the stator end side over the axial height of the winding head. Preferably, the partitions are designed to be higher than the entire axial height of the winding head. As a result, in particular, the contact areas of the strip conductors are electrically insulated from each other and are also preferably mechanically fixed. Here, the partitions extend inwardly or outwardly from the hollow cylinder, depending on the structural type of the stator.

[0015] The insulating ring does not require the winding head to be impregnated, i.e., cast with resin. Insulating paper can also be omitted. The insulation is provided by partitions extending radially from the hollow cylinder. In particular, the air gap distance and creepage distance between the individual strip conductors are increased by the partitions, so that the strip conductors can be positioned at a smaller distance from each other without falling below the air gap distance and creepage distance predetermined in the specification.

[0016] The shortest distance along the surface of a solid insulating material between two conductive elements is called the creepage distance. The shortest spacing between two conductive elements is called the air clearance distance.

[0017] In a preferred embodiment, a second wall formed by a hollow cylinder and having an inner diameter greater than an outer diameter of the first wall is coaxially arranged around the first wall, and the partition extends radially between the first wall and the second wall. This embodiment is advantageous for all shapes of strip conductors.

[0018] In another preferred embodiment, the partition is made of an elastic material, so that the partition is flexible and can be adapted to different geometries and can compensate for tolerances.

[0019] Preferably, the partition is designed to be wedge-shaped. The wedge shape can refer to the axial extension direction or the radial extension direction of the partition. In other words: when the insulating ring is cut tangentially and / or perpendicularly to the longitudinal axis of the stator, a wedge-shaped cross section of the partition is obtained. The tip of the wedge is preferably formed in the insertion direction of the insulating ring. As a result, the contact area can be tensioned and is less sensitive to vibrations.

[0020] Furthermore, the partition preferably has a fastening element, in particular a clamping element or a projection. The fastening element reduces the tendency of the strip conductor, in particular the contact region of the strip conductor, to vibrate. As a result, the connection, in particular in the respective contact region, is less stressed. Other types of fastening elements are conceivable. In particular, a wedge shape and a fastening element can be combined.

[0021] In another preferred embodiment, the annular plate is coaxially connected or connectable to the end face of the first hollow cylinder and / or the second hollow cylinder. The annular plate serves as a stop when installing the insulating ring and / or as a protective cover for the contact area of ​​the strip conductor.

[0022] In a preferred embodiment, a fluid, in particular a cooling fluid, can flow through the insulating ring, and the annular plates each have at least one inlet opening and at least one outlet opening, wherein the inlet opening is arranged radially outside and the outlet opening is arranged radially inside. As a result, a fluid flow from the radial outside to the radial inside or in the opposite direction is possible. The fluid flow is preferably used to cool the winding head. It is conceivable that the fluid flow has a radial and / or circumferential component. The partitions can form cooling channel sections in pairs.

[0023] Advantageously, the intermediate plate has a fluid-conducting element which can generate eddies in the fluid flow in order to improve the heat transfer between the winding and the cooling fluid.

[0024] Advantageously, the insulating ring is designed in multiple parts, so that it can be assembled axially and / or radially from the inside and / or from the outside.

[0025] Within the scope of the present invention, a stator, in particular a stator for an electric motor, is disclosed and claimed, which comprises a plurality of strip conductors, wherein the stator comprises at least one insulating ring and spacers are arranged between at least some of the strip conductors.

[0026] Preferably, the stator has a number of electrical connection tabs corresponding to the number of the strip conductors, so that the strip conductors can be easily connected to each other.

[0027] Furthermore, the insulating ring is preferably pressed against a sealing gasket arranged in the stator, so that a closed fluid circuit is formed. The sealing gasket is thus subjected to a uniform surface pressure. In particular, the sealing gasket is pressed against more than just one annular surface of the inner wall and / or the outer wall. As a result, the sealing gasket rests much more firmly on the strip conductor, thus improving the sealing effect.

[0028] The sealing pad is preferably designed in one piece in order to keep the number of parts low. Also possible is a multi-part embodiment, in particular a division into a plurality of annular segments in a sector shape around the axis of rotation and / or a division into a plurality of concentric sealing elements radially.

[0029] Also disclosed and claimed within the scope of the present invention is an electric motor having a stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The invention is explained in further detail with reference to the attached schematic drawings using a number of exemplary embodiments.

[0031] In the figure:

[0032] Figure 1 A perspective view of a stator laminated core with embedded strip conductors according to an exemplary embodiment of the present invention is shown,

[0033] Figure 2 A perspective view of a stator laminated core with embedded strip conductors and insulating rings according to an embodiment of the present invention is shown,

[0034] Figure 3 A schematic diagram showing an insulating ring without fastening elements according to an embodiment of the present invention,

[0035] Figure 4 A schematic diagram showing an insulating ring with a fastening element according to an embodiment of the present invention,

[0036] Figure 5a A perspective view showing an insulating ring according to an embodiment of the present invention,

[0037] Figure 5b Show according to Figure 5a Another perspective view of an insulating ring according to an embodiment of the present invention,

[0038] Figure 6 A perspective view showing a stator with an insulating ring according to a preferred embodiment of the present invention is shown.

[0039] Figure 7a A perspective view of an embodiment of a winding head with multiple connection planes is shown,

[0040] Figure 7b A further perspective view shows an exemplary embodiment of a winding head with multiple connection planes,

[0041] FIG. 8 shows a further perspective view of an exemplary embodiment of a winding head with multiple connection planes,

[0042] FIG. 9 a shows a perspective view of an assembled connection plane with an insulating ring according to an embodiment of the present invention,

[0043] FIG. 9 b shows another perspective view of the assembled connection plane with the insulating ring according to an embodiment of the present invention,

[0044] Fig.10 A cross-sectional view showing an embodiment of a stator,

[0045] Fig.11 A perspective view showing an embodiment of a sealing gasket,

[0046] Fig.12 A schematic top view of a winding head with an insulating ring and a fluid cooling portion according to an exemplary embodiment of the present invention is shown.

[0047] Fig.13 Show according to Fig.12 A schematic diagram of an embodiment of the present invention,

[0048] Fig.14 Show according to Fig.12 Another schematic diagram of an embodiment of the present invention,

[0049] Fig.15 Show according to Fig.12 Another schematic diagram of an embodiment of the present invention,

[0050] Fig.16 Show according to Fig.12 Another schematic diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0051] Figure 1An embodiment of a stator laminated core 25 of a stator 10 is shown, the stator having an embedded strip conductor 21. The stator laminated core 25 basically has the shape of a hollow cylinder. The stator laminated core has an end side or end surface at each axial end. The end side or end surface can also be referred to as a stator end side. The stator laminated core 25 has stator slots distributed on the circumference and extending axially on the inner side. Two strip conductors 21 are respectively arranged in the stator slots to form a double-layer system. The strip conductor forms part of the assembled winding. The strip conductor 21 can be understood in particular as a hairpin conductor or an I-shaped pin conductor. It can be formed into a stranded wire, such as a shape-pressed stranded wire, in a multi-piece manner. The strip conductor 21 has a contact area on its axial end, which is electrically connected indirectly or directly for the purpose of manufacturing the winding.

[0052] If different strip conductors have different potentials, these strip conductors must be sufficiently insulated from each other. The creepage distance (line with filled end points) and the air gap distance (line with unfilled end points) are shown in the enlarged view. The shortest distance along the surface of the solid insulating material between two conductive elements is called the creepage distance. The shortest distance between two conductive elements is called the air gap distance.

[0053] Figure 2 Shown with Figure 1 The same stator laminated core 25. Figure 2 In the stator core 25, an insulating ring is additionally arranged on the end side. The insulating ring is coaxially arranged on the stator laminated core 25. The insulating ring includes a first wall plate 11 and a second wall plate 14. Each wall plate 11, 14 is formed by two hollow cylinders 12, 15 arranged concentrically to each other, wherein the inner diameter of the second hollow cylinder 15 is larger than the outer diameter of the first hollow cylinder 12. The partition 13 extends radially between the two wall plates 11, 14. The partition 13 is arranged in a star shape. The partition is implemented as a uniform, especially non-wedge-shaped, in a cross section parallel to the longitudinal axis of the stator and in a cross section perpendicular to the longitudinal axis of the stator. In the assembled state, the partition 13 is arranged between each strip conductor 21. The partition extends from the stator end side to the axial end of the winding head from an axial point of view. The axial end of the winding head can be formed by the end of the strip conductor. As a result, the strip conductors 21 of different slots, especially in each contact area, are electrically insulated and mechanically fixed. Outside the contact region, the strip conductors can have an insulating sleeve, which is applied, for example, in the form of an extrudate. The strip conductors of the same slot can also be insulated from one another (air) by sufficiently large spacings without introducing additional material. The strip conductors of the same slot are therefore preferably designed with different lengths.

[0054] Figure 3 Show according to Figure 2 Schematic top view of the assembled insulating ring. Figure 2 As shown in FIG. 1 , the partition 13 extends between the first wall 11 and the second wall 14. Between each partition 13, a strip conductor 21 is arranged.

[0055] Figure 4 Basically Figure 3 The same, the difference is that the partition 13 has a fastening element 16. The fastening element is designed as a lug or groove in this embodiment, which is assigned to each strip conductor 21 in pairs and abuts against the strip conductor or clamps the strip conductor 21. One or more fastening elements can be preset. The fastening element can be implemented continuously or intermittently along the longitudinal axis of the stator. In this way, the fastening element 16 slows down the vibration tendency of the strip conductor 21. Fastening elements 16 of other shapes can be considered. The partition 13 is also fixed in the first wall plate in a form-locking manner. The form-locking portion is designed as a tongue-and-groove joint. This increases the rigidity of the component.

[0056] Figure 5a and Figure 5b Another embodiment of an insulating ring is shown. The insulating ring comprises a first wall 11, a partition 13 and an annular plate 17. The first wall 11 is formed by a hollow cylinder 12. On the outer side of the first wall 11, the partitions 13 are arranged distributed on the circumference. In contrast to the insulating ring described in the previous figures, the insulating ring described here does not have a second wall 14. The partition extends freely radially outward. The annular plate 17 is coaxially arranged on the end side of the first wall 11. The outer diameter of the annular plate 17 determines the size so that the annular plate 17 protrudes from the partition 13. An annular protrusion is arranged on the annular plate 17. The annular protrusion has a groove extending on the outer circumference. The groove is used to accommodate a sealing part, in particular an O-ring.

[0057] The insulating ring shown also includes an inlet 18 and an outlet 19 for a fluid, in particular a cooling fluid, which can be connected in a fluid circulation manner. The inlet 18 is provided on the radially outer edge of the annular plate 17. The inlet 18 is designed to be located between the outer edge of the annular plate 17 and the outer edge of the annular plate 17. Figure 6. The inner diameter of the annular plate 17 is larger than the outer diameter of the hollow cylinder 12. The annular plate 17 is arranged on the axial end of the partition 13. As a result, an annular gap is formed between the first wall plate 11 and the annular plate 17. The annular gap forms an outlet 19 for the fluid. The cooling fluid basically flows from the inlet 18 on the outer edge of the annular plate 17 to the outlet 19 arranged radially inside. In between, before the cooling fluid is discharged from the outlet 19 again, the cooling fluid flows through the partition 13 of the winding head and the insulating ring. It is conceivable that the fluid flow has a radial and / or circumferential portion. It is also conceivable that the partition 13 has a fluid-conducting element to improve the heat transfer between the area to be cooled, in particular the strip conductor 21 and / or the connecting tab 22 and the cooling fluid. For this purpose, for example, a convex nose, a protrusion and / or a depression can be installed on the partition, which extends along and / or transversely to the flow direction of the fluid. It is also conceivable to provide a throttle gap formed by a projection of the web 13 and the side surfaces of the strip conductor 21 , for example in order to achieve a targeted eddying of the flow in this region.

[0058] exist Figure 6 1 shows an embodiment of a stator 10 in an assembled state in an exploded view. The stator 10 shown is suitable for generating a rotating magnetic field for both asynchronous motors and synchronous motors. The stator 10 comprises: an insulating ring, which substantially corresponds to Figure 5a and 5b Insulating ring in; Figure 1 and Figure 2 The stator 10 comprises a laminated stator core 25 with strip conductors 21, a housing and two winding heads, wherein each winding head is arranged at an axial end of the stator 10. The region of the electrical winding that protrudes axially from the stator 10 is referred to as the winding head.

[0059] The winding head in its original sense includes the contact areas of the individual strip conductors 21 with the electrically conductive connecting webs 22. In another sense, the winding head also includes insulating washers 24, sealing washers 23 and insulating rings.

[0060] The strip conductors 21 are arranged in the stator slots of the stator laminated core 25. The stator laminated core 25 is coaxially arranged in the housing. On the axial end of the stator laminated core 25 facing away from the stator center point, the sealing gasket 23 is coaxially arranged so that the sealing gasket 23 lies flat on the stator slot in a sealing manner. A connection plane is arranged on the sealing gasket 23. The connection plane is formed by the connection tabs 22, the insulating gaskets 24 and the contact areas of the strip conductors 21. The insulating ring is arranged together with the cover 17 on the last connection plane. The partition 13 of the insulating ring extends on all connection planes when viewed in the axial direction.

[0061] Figure 7a , 7b8 shows the connection plane in the assembled state and Figure 6 Stereoscopic images from different perspectives. Figure 7a and Figure 7b In FIG. 8 , the insulating spacers 24 can be clearly seen (without the connecting webs 22 ), which electrically insulate the connecting webs 22 from one another. In FIG. 9 , the insulating spacers 24 can be clearly seen together with the inserted connecting webs 22 , which connect the strip conductors 21 to one another.

[0062] 9a and 9b show the insulating ring with the connecting lug 22 and the insulating washer 24 in the assembled state. FIG. 9a shows a perspective view from above, while FIG. 9b shows a perspective view from below. The connecting lug 22 and the insulating washer 24 form the main part of the winding head. The insulating ring is arranged coaxially in the assembly formed by the connecting lug 22 and the insulating washer 24, so that the annular plate 17 lies tightly, in particular sealingly, on the connecting plane of the end side. For this purpose, the insulating ring can be subjected to a force that compresses each other in the axial direction.

[0063] exist Fig.10 1 shows a cross-sectional view of an embodiment of the stator 10. The stator 10 comprises a winding head, a strip conductor 21, a connecting tab 22 and an insulating ring. A sealing gasket 23 is arranged on the axial end of the insulating ring in the installation direction. The sealing gasket 23 lies flat on the stator slot. The insulating ring applies a uniform surface pressure to the sealing gasket 23. The sealing effect of the sealing gasket 23 is improved by a more uniform distribution of the pressing force. For this purpose, the insulating ring can be subjected to a mutually pressing force in the axial direction.

[0064] Fig.11 Show Figure 6 and Fig.10 The sealing gasket 23 in the stator 23 is provided. The sealing gasket 23 made of elastic material is designed in the shape of an annular plate. The sealing gasket 23 has a narrow and elongated opening, which is arranged in the circumferential direction. In other words, the opening is designed as a slit that tapers toward the middle point of the sealing gasket 23, and the slit corresponds to the shape of the stator slot or the strip conductor, but is implemented smaller. Other shapes are conceivable. In the installed state, a strip conductor 21 is arranged in the opening, which elastically expands the opening of the sealing gasket 23. Therefore, the opening is advantageously adapted to the geometric shape of the strip conductor 21.

[0065] Figure 12-16 An exemplary embodiment of a winding head formed from strip conductors 21 connected directly to one another is shown.

[0066] Fig.12An embodiment of an insulating ring with a fluid cooling portion is shown. The insulating ring comprises a first wall plate 11 and a second wall plate 14, between which partition plates 13 are arranged in a star shape. Strip conductors 21, in particular contact areas of the strip conductors 21, are arranged between the partition plates 13. The strip conductors 21 are designed as hairpin conductors (not shown). Alternatively, other types of strip conductors 21 can be considered. The strip conductors 21 are arranged in the slots of the stator laminated core. The winding is designed as a four-layer winding, so that each slot includes four strip conductors. The cooling fluid flows radially from the outside to the inside. It is conceivable that the flow direction only partially extends radially. In particular, it is conceivable that the fluid flow extends partially radially and partially along the circumferential direction of the insulating ring.

[0067] Fig.13 Shown in Fig.12 1 is a side view of the second wall plate 14 of the insulating ring shown in FIG. The insulating ring is arranged on the stator laminated core 25. The second wall plate 14 includes an inlet 18 for a cooling fluid. In this embodiment, the inlet 18 is designed as a partially discontinuous gap, which extends over the circumference of the second wall plate 14. That is, the distance between the gaps is so small that basically an annular gap is formed. Other shapes of the inlet 18 are conceivable. The inlet 18 extends over the entire circumference of the second wall plate 14. More precisely, the inlet 18 is arranged in the second wall plate 14 in the direction of the axial end facing away from the stator laminated core 25.

[0068] Fig.14 Show Fig.12 1 shows a side view of the first wall 12 of the insulating ring shown in FIG. The first wall 11 comprises an outlet 19 for the cooling fluid. The outlet 18 is arranged at an axial end of the first wall 11, which faces the stator laminated core 25. The outlet 19 is designed as an opening distributed on the circumference of the first wall 11, wherein the width of the opening preferably corresponds to the distance of the partition 13. Other shapes for the outlet 19, such as annular gaps, are conceivable.

[0069] exist Fig.15, a cross-sectional view of the insulating ring is shown in FIG. An annular plate 17 is arranged on the axial end facing away from the stator laminated core. A contact area of ​​a strip conductor 21 is arranged between the annular plate 17 and the stator laminated core. The strip conductor 21 is designed as a hairpin conductor. The hairpin conductor is a strip conductor of one-piece design, which is bent in a U-shaped or hairpin shape and inserted into two different stator slots. The hairpin conductor therefore only needs to contact one side of the stator laminated core. A partition 13 is arranged between each strip conductor 21. The partition 13 is designed to be half high. Thus, the partition 13 can be arranged, in particular, can be pushed in between the hairpin conductors. Advantageously, the insulating ring is therefore designed as a multi-piece in this embodiment. Therefore, it is advantageous that the partition is designed to be elastic so that the partition can be arranged more simply between the hairpin conductors. In particular, for example, a fragile insulating sleeve, for example made of ceramic, mounted on the hairpin conductor can be omitted, and the insulating sleeve may be easily broken or cracked due to bending the strip conductor. Fig.16 Show according to Figures 12 to 15 A cross-sectional view of the insulating ring. Figures 12 to 15 As described in, the insulating ring has an inlet 18 arranged on the second wall plate 14 and an outlet 19 arranged on the first wall plate 11. A strip conductor 21 designed as a hairpin conductor in the circumferential direction is arranged between the first wall plate 11 and the second wall plate 14. A half-height partition 13 is arranged between each hairpin conductor. The partition 13 extends from the first wall plate 11 to the front of the second wall plate 14. That is, the partition 13 is only connected or can be connected to the first wall plate 11. In order to arrange the insulating ring on the winding head so that the partition 13 can be arranged between each hairpin conductor, it is meaningful to first assemble the first wall plate 11 together with the partition 13 on the winding head and then install the second wall plate 14. The arrow describes the direction of the fluid flow in the insulating ring. As a result, the fluid flows radially from the inlet 18 in the direction of the outlet 19.

[0070] Reference numerals list

[0071] 10 Stator

[0072] 11 First wall panel

[0073] 12First hollow cylinder

[0074] 13 Partition

[0075] 14 Second wall panel

[0076] 15 Second hollow cylinder

[0077] 16 Fastening elements

[0078] 17 Ring plate

[0079] 18Entrance

[0080] 19 Exhaust

[0081] 21 Strip conductor

[0082] 22 Connecting tabs

[0083] 23 Sealing pad

[0084] 24 Insulation gasket

[0085] 25 stator laminated core.

Claims

1. An insulating ring for a stator (10), the stator comprising a winding assembled with strip conductors, in, The strip conductor is designed in the shape of a hairpin or I and has contact areas at its axial ends, which are indirectly or directly electrically connected for the production of the winding, the winding forming a winding head, wherein the insulating ring comprises at least one first wall (11), which is formed by a first hollow cylinder (12), wherein partitions (13) are arranged in a star shape on the surface of the first wall (11), and the partitions are formed of an electrically insulating material, characterized in that the partitions (13) are arranged starting from the stator end side at the end of the winding head. The insulating ring (14) is a hollow cylindrical body (12) and a second hollow cylindrical body (15) having an inner diameter greater than an outer diameter of the first hollow cylindrical body (11), wherein the second wall (14) is coaxially arranged around the first wall (11), and the partition (13) extends radially between the first wall (11) and the second wall (14), wherein an annular plate (17) is coaxially connected to the end side of the first hollow cylinder (12) and / or the end side of the second hollow cylinder (15), and wherein a cooling fluid can flow through the insulating ring.

2. The insulating ring according to claim 1, It is characterized in that The partition (13) is formed of an elastic material.

3. The insulating ring according to claim 1 or 2, It is characterized in that The partition (13) is designed to be wedge-shaped.

4. The insulating ring according to claim 1 or 2, It is characterized in that The partition (13) has a fastening element (16).

5. The insulating ring according to claim 1, It is characterized in that The annular plates (17) each have at least one inlet opening (18) and at least one outlet opening (19), wherein the inlet opening (18) is arranged radially on the outside and the outlet opening (19) is arranged radially on the inside.

6. The insulating ring according to claim 5, It is characterized in that The partition (13) has a fluid-conducting element.

7. The insulating ring according to claim 1 or 2, It is characterized in that The insulating ring is designed in multiple parts.

8. The insulating ring according to claim 1, It is characterized in that The partition (13) extends outward from the first hollow cylinder (12).

9. The insulating ring according to claim 1, It is characterized in that The partition (13) extends inwardly from the second hollow cylinder (15).

10. The insulating ring according to claim 4, It is characterized in that The fastening element (16) is a clamping element or a projection.

11. A stator having a plurality of strip conductors (21), wherein the stator (10) comprises at least one insulating ring according to any one of claims 1 to 10, and wherein the separator (13) is arranged between at least a portion of the strip conductors (21).

12. The stator according to claim 11, It is characterized in that The stator (10) has a number of connecting tabs (22) corresponding to the number of the strip conductors (21).

13. The stator according to claim 11 or 12, It is characterized in that At least one insulating ring is pressed against a sealing gasket (23) arranged in the stator (10), thereby forming a closed fluid circulation.

14. The stator according to claim 11, It is characterized in that The stator is a stator for an electric motor.

15. An electric motor having a stator (10) according to any one of claims 11 to 14.

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