DE102021203210A1 - Isolation device, stator and electric machine - Google Patents

Abstract

Insulation device (2) for electrically insulating a winding overhang (7) of a stator winding (4) from connection elements (8a-c) for electrical connections of the stator winding (4), the insulation device (2) having a plate-shaped body (20), the- one first side (21) adapted to extend circumferentially at least partially over an axial end of the end winding (7),- a second side (22) located opposite the first side (“1) and on which the connection elements (8a-c) can be arranged, and- at least one recess (23a, 23b) which extends from the first side (21) to the second side (22) and through which at least one of the connections from the first side ( 21) can be carried out in order to be electrically conductively connected to one of the connection elements (8a-c) on the second side (22), an insulation arrangement (24) being provided which has a first section (25a, 25b), who differ from the first side (21) of the body (20) in a direction pointing away from the second side (22) and is set up to close the end winding (7) along its circumference on one of two radial sides of the end winding (7). surround.

Description

The present invention relates to an insulation device for electrically insulating a winding overhang of a stator winding from connection elements for electrical connections of the stator winding, the insulation device having a plate-shaped body which has a first side which is designed to extend at least partially over an axial end of the to extend end winding, a second side which is arranged opposite the first side and on which the connection elements can be arranged, and at least one recess which extends from the first side to the second side and through the at least one of the connections from the first side can be carried out in order to be electrically conductively connected to one of the connection elements on the second side.

In addition, the invention relates to a stator for an electrical machine and an electrical machine.

A stator winding of a stator for an electrical machine typically forms a winding overhang on one of the end faces of a stator core. If the stator is to be connected from this side, additional insulation measures are required in order to electrically insulate the end winding from connection elements for electrical connections of the stator winding.

the US 2013/0 147 306 A1 discloses a spacer for supporting conductors in a stator assembly of an electric machine. The spacer includes an insulating body formed from an electrically non-conductive material. The body has an axially inner surface and an outer surface opposite the inner surface. Phase connection pockets are formed in the spacer, through which phase connections of the stator arrangement are passed. In addition, pockets for a neutral conductor are provided in the spacer, in which axially outwardly projecting neutral conductors of the stator arrangement are accommodated.

In such an insulation device, the neutral conductors forming a star point connection thus extend axially outward beyond the end winding. As a result, the stator arrangement, together with the spacer, takes up a large amount of installation space in the axial direction.

The invention is therefore based on the object of specifying an improved possibility, in particular one that saves installation space, for insulating a stator winding.

This object is achieved according to the invention by an insulation device of the type mentioned, which further comprises an insulation arrangement which has a first section, which extends from the first side of the body in a direction pointing away from the second side, and is set up to To surround end winding along its circumference on one of two radial sides of the end winding.

The insulation device according to the invention for electrically insulating a winding overhang of a stator winding from connection elements for electrical connections of the stator winding has a plate-shaped body. The body has a first side configured to extend circumferentially at least partially beyond an axial end of the end turn. The body has a second side, which is arranged opposite the first side and on which the connection elements can be arranged. The body has at least one recess which extends from the first side to the second side and through which at least one of the connections can be passed from the first side in order to be electrically conductively connected to one of the connection elements on the second side. The isolation device also has an isolation arrangement. The insulation arrangement has a first section. The first portion extends from the first side of the body in a direction away from the second side. The first section is designed to surround the end winding along its circumference on one of two radial sides of the end winding.

The insulation device according to the invention makes it possible, through the insulation arrangement with its first section, to electrically insulate the winding overhang from other objects that are arranged on the radial side of the winding overhang. The fact that the object does not have to be arranged at the axial end of the end winding saves installation space. In this way, greater degrees of freedom are achieved in the design of a stator having the stator winding, because the object arranged on the radial side can be arranged close to the radial side of the winding overhang because of the insulating effect provided by the first section. At the same time, the first section of the insulation arrangement ensures sufficiently large clearances and creepage distances between the end winding and the object.

In a preferred embodiment, the radial side is the radially inner side of the two sides of the end winding. This is particularly advantageous because the installation space in a stator for an internal rotor is particularly tight radially on the inside and can be used efficiently as a result of the insulating effect. the However, the radial side can also be the radially outer side of the two sides of the end winding.

A winding overhang is to be understood in particular as meaning those sections of the stator winding which protrude from the stator core at one end thereof and assume an essentially hollow-cylindrical shape there. The terms "radial", "axial" and "circumference" refer to the hollow-cylindrical design of the end winding.

The isolation device is preferably formed from an electrically insulating plastic. The body is preferably flat on the first side and/or on the second side.

In a preferred embodiment of the insulation device according to the invention, it is provided that the insulation arrangement has a second section, which extends from the first side of the body in the direction pointing away from the second side, and is set up to have a first section arranged on the radial side of the end winding To surround the star connection for the stator winding on the side facing away from the end winding of the first star point connection, so that the first section and the second section surround the first star point connection on both sides. Due to the first and the second section of the insulation arrangement, the first star point connection can be electrically insulated on both sides and can thus be arranged in a space-saving manner on the radial side of the end winding. In this way, in particular, an arrangement of the first star point connection that increases the axial extent of the stator can be dispensed with beyond the axial end of the end winding and installation space can be saved.

In the insulation device according to the invention, it can also be provided that the insulation arrangement has a third section, which extends, in particular concentrically to the first section, from the first side of the body in the direction pointing away from the second side and is set up to have the end winding along its circumference on the radial side or the other of the radial sides of the end winding. By means of the third section, a further object can be arranged in a manner analogous to the first object on the other radial side of the winding overhang, electrically isolated from the latter.

In an advantageous embodiment, it is further provided that the insulation arrangement has a fourth section, which extends from the first side of the body in the direction pointing away from the second side of the body and is set up to have a on the radial side of the end winding, which is surrounded by the third section, to surround arranged second star point connection for the stator winding on the side of the second star point connection facing away from the end winding, so that the third section and the fourth section surround the second star point connection on both sides. The third and fourth sections of the insulation arrangement allow the second star point connection to be electrically insulated on both sides and corresponding installation space to be saved.

In addition, the insulation arrangement can have a fifth section which extends from the first side of the body in the direction pointing away from the second side of the body, extends together with the first section along an arc of a circle and is set up to surround the end winding . Alternatively or additionally, the insulation arrangement can have a sixth section, which extends from the first side of the body in the direction pointing away from the second side of the body, extends together with the third section along an arc of a circle and is set up to to surround the winding head. The fifth section and the sixth section serve to mechanically stabilize the arrangement of the insulation device on the end winding.

In an alternative configuration of the insulation arrangement, it can be provided that the insulation arrangement also has a connecting section which adjoins the first section and extends along a plane lying parallel to the body, and a second section which extends away from the connecting section concentrically with the first section. wherein the second section is set up to surround a first star-point connection for the stator winding, which is arranged on the radial side of the winding overhang, on the side of the first star-point connection facing away from the winding overhang, so that the first section and the second section surround the first star-point connection on both sides. As an alternative or in addition, it can be provided that the insulation arrangement also has a connecting section which adjoins the third section and which extends along a plane lying parallel to the body, and a fourth section which extends away from the connecting section concentrically with the third section, wherein the fourth section is set up to enclose a second star point connection for the stator winding arranged on the radial side of the end winding, which is surrounded by the third section, so that the third section and the fourth section enclose the second star point connection on both sides. It can be provided that the or a respective connecting section through-opening gene has, through which star point connections of the stator winding can be performed. The star point connections or the sections of the insulation arrangement surrounding them are preferably provided on different radial sides of the end winding.

In the alternative configuration, the first and the second section or the third and the fourth section can accommodate and position the respective star point connection. The respective star point connection can thus be inserted into the insulation device before the insulation device is placed on the end winding. If the star-point connections are placed in the insulation device and are then placed together on the winding overhang, production costs can be saved as a result. Due to the fact that in the alternative configuration the star point connection and the end sections to be connected to it—to be explained in more detail below—are not covered, electrically conductive fastening, in particular by means of welding, can take place after the insulation device has been put on. The connection elements and the star point connections can then advantageously be attached in one step.

A respective section of the insulation arrangement is preferably in the form of a right cylinder with an approximately C-shaped base area, in particular in the shape of a sector of a circular ring. A lateral surface of the straight cylinder points in particular towards the end winding. A base of the straight cylinder rests on the body, so that the straight cylinder protrudes from the body. In one embodiment, the body and sections form one or more channels or a multiple channel.

Preferably, the first side of the body extends from a first end of the body to a second end of the body to extend from the first end to the second end along the axial end of the end turns in the circumferential direction of the end turns. In particular, the body extends over at most 75%, preferably over at most 60%, particularly preferably over at most 50%, of the circumferential direction of the end winding.

In this case, the first section of the insulation arrangement can be provided at the first end of the body. Alternatively or additionally, the second section of the insulation arrangement can be provided at the first end of the body. Alternatively or additionally, the third section of the insulation arrangement can be provided at the second end of the body. Alternatively or additionally, the fifth section of the insulation arrangement can be provided at the second end of the body. Alternatively or additionally, the fifth section of the insulation arrangement can be provided at the first end of the body.

Provision can furthermore be made for the body to have a plurality of through-openings penetrating the first side and the second side. After assembly, a stator, together with the insulation device, is often cast or coated with a flowable material, for example by being immersed in an immersion bath. The through-opening allows the free-flowing material to penetrate more easily into the areas of the winding overhang covered by the body during immersion. Furthermore, the through-opening also allows the free-flowing material to flow off better after it has been immersed, in order to avoid massive accumulations of the material between the insulation device and the end winding. By avoiding such accumulations, a more robust operation of the stator or the electrical machine having it is possible.

The through openings may be located at locations where two of the sections of the insulation assembly are concentric with each other.

The through openings may also be located at locations where the first portion and the second portion of the insulation assembly are concentric with each other and/or a location where the third portion and the fourth portion of the insulation assembly are concentric with each other. Since the second side of the body and the concentric sections delimit a free space into which the flowable material can only enter with difficulty, the through-opening allows particularly good wetting of the object held in the free space, in particular the star point connection. The through-openings can also be arranged at points at which the fifth section and the third section and/or the sixth section and the first section run concentrically to one another.

The through openings may also be located at locations midway between respective groups of four of the recesses of which a first recess and a second recess are at a first radial position, a third recess and a fourth recess are at a second radial position, the first recess and the third recess is at a first circumferential position and the second and fourth recesses are at a second circumferential position.

In an advantageous embodiment, the body of the insulation device according to the invention has an arcuate, in particular arcuate, profile. In this case, a respective section of the insulation arrangement can extend in the axial direction and in the circumferential direction with respect to the curved course.

In the insulation device according to the invention, it is preferably provided that at least some of the recesses are arranged on a first arc of a circle, which runs concentrically to the first section of the insulation arrangement. As a result, connections of the stator winding protruding out of the stator core can be led out through the recess at different radial positions of the stator.

Provision can furthermore be made for some of the recesses to be arranged on a second arc of a circle which runs concentrically to and at a distance from the first arc of a circle. This enables connections arranged at two different radial positions to be passed through the recess. In particular, there are two recesses in each case at at least one angular position of the circular arcs. This makes it possible to electrically connect radially inner and radially outer terminals of the same phase at the angular position by one terminal. In a particularly preferred embodiment, two recesses lying on both circular arcs are provided at three different angular positions of the circular arcs.

In addition, it can be provided in the insulation device according to the invention that a respective recess has an edge with a projection directed into the recess. A position of a plurality of connecting elements passed through a recess can be fixed by the projection.

In a preferred embodiment of the insulation device according to the invention, it is provided that a receiving space is formed for a respective connecting element on the second side of the body, which is set up to inhibit movement of the connecting element with respect to the second side when it is received in the receiving space. In particular, the receiving space has one or more projections for inhibiting a rotational movement of the connecting element about an axis of rotation perpendicular to the second side. Alternatively or additionally, the receiving space has a projection for inhibiting a translational movement of the connection element along the second side. The connection element can thus be securely positioned on the second side of the body.

In addition, it can be provided that the body has a further recess in which a sensor arranged on the end winding can be accommodated. As a result, the sensor, for example a temperature sensor for determining a temperature of the end winding, can be securely positioned. In a preferred development, a projection for guiding the sensor is formed along an edge contour of the recess on the second side. The projection allows additional support for the sensor.

The object on which the invention is based is also achieved by a stator for an electrical machine, having a stator core, a stator winding, which has a plurality of partial windings forming a winding overhang on an axial end face of the stator core and strands of the stator, each partial winding having an end section which comprises a free end of the partial winding, protrudes from the stator core at the end face and forms a connection of one of the phases, a connection arrangement which has a number of connection elements corresponding to the number of phases, with a respective connection element connecting the end sections of the partial windings of one of the phases, and an insulation device according to the invention for electrically insulating the winding overhang of the stator winding from the connection elements, the insulation device being arranged on the axial end of the winding overhang.

Preferably, the first side of the body rests on the axial end of the end turn. The first section preferably surrounds the end winding along its circumference. The third section preferably surrounds the winding overhang on the radial side of the winding overhang opposite the first section.

Provision can also advantageously be made for each partial winding to have a further end section which encompasses another free end of the partial winding, protrudes from the stator core at the end face and forms a neutral point connection of the partial winding. Provision is preferably made for the end sections of part of the partial windings forming the star point connection to extend on an inner radial side of the end winding and the stator also having a first star point connection, in particular designed as an arcuate busbar, through which the end sections of the part of the partial windings forming the star point connection are connected to each other. Alternatively or additionally, it is provided that the end sections of a part of the partial windings that form the star point connection extend on an outer radial side of the winding overhang, with the stator also has a second star point connection, in particular designed as an arcuate busbar, through which the end sections of the part of the partial windings that form the star point connection are connected to one another.

The first section and the second section preferably surround the first star point connection on both sides. The third section and the fourth section preferably surround the second star point connection on both sides.

In a preferred embodiment of the stator according to the invention, the first end section of a respective partial winding protrudes from the stator core at a predetermined angular position in a circumferential direction thereof and extends radially away from the end winding in the axial direction. Alternatively or additionally, the second end section of a respective partial winding protrudes from the stator core at a predetermined angular position in a circumferential direction of the stator core and extends radially away from the end winding in the axial direction.

The second end section of a respective partial winding preferably occupies a greater radial distance from the end winding than the first end section.

In a preferred embodiment, the first end sections are axially longer than the second end sections. The first end sections preferably extend beyond the axial end of the end winding. The second end sections preferably do not extend beyond the axial end of the end winding.

In addition, the stator can also have a sensor. The sensor is preferably accommodated in the further recess, so that its projection guides the sensor. The sensor is preferably a temperature sensor that is set up to detect a temperature at the end winding.

Alternatively or additionally, a multiplicity of slots arranged in the circumferential direction can be formed in the stator core. In particular, the stator winding is arranged in sections in the slots.

In addition, each partial winding can have a plurality of form conductors which extend through the stator core along an axial direction. Such a stator winding is also referred to as a hairpin winding. In particular, the shaped conductors have an essentially rectangular cross-section and, in particular, are not limp.

The shaped conductors are preferably accommodated in a predetermined number of radially arranged layers of a respective slot in the stator core. The shaped conductors directly adjoining the end sections are preferably accommodated in radially first and/or radially last layers of a groove.

The end sections of a respective partial winding and the form conductors of the partial winding are preferably arranged parallel to one another.

The object on which the invention is based is also achieved by an electric machine for driving a vehicle, having a stator according to the invention and a rotor which is rotatably mounted inside the stator.

The electric machine according to the invention is preferably set up to drive a vehicle. In this respect, it can be set up to form part of a drive train of the vehicle. The electrical machine is preferably designed as a synchronous machine, in particular a permanently excited one. Alternatively, the electrical machine can be designed as an asynchronous machine.

The object on which the invention is based is also achieved by a vehicle having an electric machine according to the invention, which is set up to drive the vehicle. The vehicle may be a battery electric vehicle (BEV) or a hybrid vehicle.

• 1 eine perspektivische Ansicht eines ersten Ausführungsbeispiels des erfindungsgemäßen Stators mit einem ersten Ausführungsbeispiel der erfindungsgemäßen Isolationsvorrichtung;
• 2 eine perspektivische Darstellung des Statorkerns und der Statorwicklung;
• 3 eine Draufsicht auf den Statorkern und die Statorwicklung;
• 4 eine seitliche Detailansicht des Statorkerns und der Statorwicklung;
• 5 eine geschnittene Detailansicht des Statorkerns und der Statorwicklung;
• 6 eine perspektivische Detailansicht des Statorkerns mit der Statorwicklung und zwei Sternpunktverbindungen;
• 7 eine seitliche Detailansicht des Statorkerns und der Statorwicklung mit einer der Sternpunktverbindungen;
• 8 eine geschnittene Detailansicht des Statorkerns mit der Statorwicklung und den Sternpunktverbindung;
• 9 eine perspektivische Ansicht des ersten Ausführungsbeispiels der Isolationsvorrichtung;
• 10 eine Draufsicht auf das erste Ausführungsbeispiel der Isolationsvorrichtung auf die erste Seite;
• 11 eine Draufsicht auf die zweite Seite des ersten Ausführungsbeispiels Isolationsvorrichtung;
• 12 eine perspektivische Ansicht des ersten Ausführungsbeispiels der Isolationsvorrichtung in einem an der Statorwicklung angeordneten Zustand;
• 13 eine geschnittene Detailansicht des ersten Ausführungsbeispiels des Stators; und
• 14 und 15 jeweils eine Prinzipskizze einer Schnittansicht eines zweiten Ausführungsbeispiels des erfindungsgemäßen Stators und eines zweiten Ausführungsbeispiels der erfindungsgemäßen Isolationsvorrichtung; und
• 16 eine Prinzipskizze eines Ausführungsbeispiels eines Fahrzeugs mit einem Ausführungsbeispiel der erfindungsgemäßen elektrischen Maschine.

Further advantages and details of the present invention result from the exemplary embodiments described below and from the drawings. These are schematic representations and show:

• 1 a perspective view of a first embodiment of the stator according to the invention with a first embodiment of the insulation device according to the invention;
• 2 a perspective view of the stator core and the stator winding;
• 3 a plan view of the stator core and the stator winding;
• 4 a detailed side view of the stator core and the stator winding;
• 5 a sectional detail view of the stator core and the stator winding;
• 6 a perspective detailed view of the stator core with the stator winding and two star point connections;
• 7 a detailed side view of the stator core and the stator winding with one of the star point connections;
• 8th a sectional detail view of the stator core with the stator winding and the star point connection;
• 9 a perspective view of the first embodiment of the isolation device;
• 10 a plan view of the first embodiment of the isolation device on the first side;
• 11 a plan view of the second side of the first embodiment of the isolation device;
• 12 a perspective view of the first embodiment of the insulation device in a state arranged on the stator winding;
• 13 a sectional detail view of the first embodiment of the stator; and
• 14 and 15 a schematic diagram of a sectional view of a second exemplary embodiment of the stator according to the invention and a second exemplary embodiment of the insulation device according to the invention; and
• 16 a schematic diagram of an embodiment of a vehicle with an embodiment of the electric machine according to the invention.

1 a perspective view of a first embodiment of a stator 1 with a first embodiment of an insulation device 2.

The stator has a stator core 3 , a stator winding 4 and a connection arrangement 5 .

The stator core 3 is formed, for example, from a laminated core with a multiplicity of axially layered individual laminates. In the axial direction, a large number of slots 3a arranged one after the other in the circumferential direction of the stator 1, 48 in the present example, penetrate the stator core 3.

The stator winding 4 has a plurality of partial windings which form a winding overhang 7 on an axial end face 6a of the stator core 3 . In addition, the partial windings form a plurality of strands or phase windings, in the present example three strands or phase windings. For example, each strand is formed by four parallel partial windings.

The connection arrangement 5 has a number of connection elements 8a, 8b, 8c that corresponds to the number of strands. Each connection element is used to supply electricity to one of the strands and can be connected to an inverter, for example.

2 until 5 show the stator core 3 and the stator windings 4, where 2 is a perspective view, 3 is a plan view of the end face 6a, 4 is a side detail view and 5 is a sectional detail view.

Each partial winding has a first end section 9a, 9b, 9c, 9d, which comprises a free end of the partial windings. The first end sections 9a to 9d protrude from the stator core 3 at the end face 6a and form a connection of one of the strands. The first end sections 9a, 9b of a part of the partial windings extend in the axial direction along the radially outer side of the end winding 7 and the first end sections 9c, 9d of another part of the partial windings extend in the axial direction along the radially inner side of the end winding 7. Each connection element 8a, 8b, 8c (see 1 ) is electrically conductively connected to the end sections 9a to 9d of the partial windings forming one of the strands.

In addition, each partial winding has a second end section 10a, 10b, 10c, 10d, which encompasses the other free end of the partial windings and protrudes from the stator core 3 at the end face 6a. The end sections 10a, 10b of a part of the partial windings extend in the axial direction along the radially inner side of the end winding 7 and the second end sections 10c, 10d of a part of the partial windings extend in the axial direction along the radially outer side of the end winding 7.

6 until 8th show the stator core 3 and stator winding 4 and a first star point connection 11 and a second star point connection 12 of the stator 1, where 6 is a perspective detailed view with the star point connections 11, 12, 7 is a detailed side view with the second star point connections 12 and 8th is a sectional detail view with the star point connections 11, 12.

The second end sections 10a, 10b of the partial windings, which extend radially inward along the end winding 7, form a first star point connection of the corresponding partial windings and are electrically conductively connected to the first star point connection 11. The second end sections 10c, 10d of the partial windings, which extend radially outward along the end winding 7, form a second star point connection of the corresponding partial windings and are electrically conductively connected to the second star point connection 12. The star point connections 11, 12 are designed here as arcuate busbars on which the corresponding second end sections 10a, 10b or 10c, 10d are attached in an electrically conductive manner.

9 is a perspective view of the first embodiment of the isolation device 2.

The insulation device 2 serves to electrically insulate the end winding 7 from the connection elements 8a, 8b, 8c for the connections 9a to 9d of the stator winding 4. The insulation device 2 has a plate-shaped body 20. A first side 21 of the body 20 is designed to extend at least partially over an axial end of the end winding 7 in the circumferential direction. A second side 22 of the body 20 is located opposite the first side 21 . The connecting elements 8a, 8b, 8c can be arranged on the second side 22.

In addition, the body 20 has a plurality of recesses 23a, 23b which extend from the first side 21 to the second side 22. The connections formed by the first end sections 9a to 9d can be passed through the recesses 23a, 23b from the first side in order to be electrically conductively connected to one of the connection elements 8a, 8b, 8c on the second side 22. The recesses 23a lie on a first arc of a circle and the recesses 23b on a second arc of a circle which is arranged concentrically to the first arc of a circle and lies radially further inwards than the first arc of a circle. As a result, the radially outer first end sections 9a, 9b can be passed through the radially outer recesses 23a and the radially inner first end sections 9c, 9d through the radially inner recesses 23b.

10 and 11 show the isolation device 2, where 10 Figure 12 is a plan view of first side 21 and 11 12 is a plan view of the second side 22. FIG.

The device 2 also has an insulation arrangement 24 . The insulation assembly 24 includes a first portion 25a extending from the first side 21 in a direction away from the second side 22 . The first section 25a is designed to surround the end winding 7 along its circumference on the radially inner side of the end winding 7 .

In addition, the insulation assembly 24 has a second portion 25b which also extends from the first side 21 of the body 20 in the direction away from the second side 22 . The second section 25b is set up to surround the first star-point connection 11 arranged on the radially inner side of the end winding 7 on the side of the first star-point connection 11 facing away from the end winding 7, so that the first section 25a and the second section 25b surround the first star-point connection 11 on both sides can surround.

The insulation assembly 24 further includes a third portion 25c extending from the first side 21 of the body 20 in a direction away from the second side 22 . The third section 25c is set up to surround the end winding 7 along its circumference on the outer radial side of the end winding 7 .

In addition, the insulation arrangement has a fourth section 25d which extends from the first side 21 of the body 20 in the direction pointing away from the second side 22 of the body 20 . The fourth section 25d is set up to surround the second star-point connection 12 arranged on the radially outer side of the end winding 7 on the side of the second star-point connection 12 facing away from the end winding 7, so that the third section 25c and the fourth section 25d surround the second star-point connection 12 on both sides surround.

In addition, a fifth section 25e and a sixth section 25f are provided, which do not surround the star point connections 11, 12 and extend on the same circular arc as the first section 25a and the third section 25c. The fifth section 25e and the sixth section 25f serve not only to insulate the end winding 7 from its radial interior and exterior, but also to ensure the mechanically stable arrangement of the insulation device 2 on the end winding 7.

The sections 25a to 25f of the insulation arrangement 24 extend concentrically to one another and are designed in the shape of an arc of a circle. In the present embodiment, they are perpendicular to the body 20.

The first section 25a and the second section 25b and the sixth section 25f are arranged at a first end 29a of the body 20 . The third section 25c, the fourth section 25d and the fifth section 25e are arranged at a second end 29b of the body 20 opposite the first end 29a.

As 10 and 11 It can also be seen that each recess 23a, 23b has an edge 30 with a projection 31 directed into the recess 23a, 23b.

In addition, the body 20 has three through holes 32a located in areas where the first portion 25a and the second section 25b extend concentrically to each other. In addition, three through holes 32b are provided in areas of the body 20 where the third portion 25c and the fourth portion 25d extend concentrically with each other.

Further through openings 32c are provided centrally between respective groups of four of the recesses 23a, 23b, of which a first recess 23a and a second recess 23a lie at a first radial position, a third recess 23b and a fourth recess 23b lie at a second radial position, the first recess 23a and third recess 23b are located at a first angular position in the circumferential direction and the second 23a and fourth recess 23b are located at a second angular position in the circumferential direction.. In addition, through openings 32d are provided in the areas where the first section 25a and the sixth Section 25f and the third section 25c and the fifth section 25e of the insulation arrangement 24 extend concentrically to one another.

In addition, the body 20 has a further recess 33a, in which a sensor 13 arranged on the end winding 7 (see 1 ) is recordable. Along an edge contour of the recess 33a on the second side 22 is a projection 33b (see 9 ) designed to guide the sensor 13.

In addition, a receiving space 34a, 34b, 34c is formed on the second side 22 of the body 20 in the insulation device 2 for a respective connection element 8a, 8b, 8c. Each receiving space 34a, 34b, 34c is designed to lift a movement of the connection element 8a, 8b, 8c with respect to the second side 22 in a received state in the receiving space 34a, 34b, 34c. Each receiving space 34a, 34b, 34c has two projections 35a, 35b for inhibiting a rotational movement of the connecting element 8a, 8b, 8c about an axis of rotation perpendicular to the second side 22. In addition, a projection 35b for inhibiting a translational movement of the connecting element 8a, 8b, 8c along the second side 22 is provided at each receiving space 34a, 34b, 34c.

The insulation device 2 is made of an electrically insulating material, for example a plastic.

12 FIG. 14 is a perspective view of the insulation device 2 in a state attached to the stator coil 4. FIG.

Representative of the remaining connection elements 8a, 8c, the connection element 8b is received in the receiving space 34b and is prevented from rotating and translational movements by the projections 35a, 35b. For this purpose, the projection 35b projects into an opposite recess of the connecting element 8b. The first end portions 9a to 9d penetrate the recesses 23a, 23b, each recess 23a, 23b receiving a pair of circumferentially adjacent end portions 9a to 9d located at the same radial position. The projections 31, one of which in 12 is covered, keep the end portions 9a to 9d in their intended position. It can also be seen how the second section 25b of the insulation arrangement 24 surrounds the first star point connection 11 radially on the inside.

13 12 is a sectional detail view of the stator 1, in which it can be seen that the insulation device 2 rests with its first side 21 on the axial end of the end winding 7. The sensor 13 can also be seen, which is guided by means of the projection 33b in such a way that it can detect a temperature of the end winding 7 .

In 1 and 8th It can also be seen that the stator winding 4 is formed from a multiplicity of shaped conductors 36 . The form conductors 36 are formed from bent metal rods, preferably made of copper. The shaped conductors 36 extend within the grooves 3a from the end face 6a to the end face 6b which is axially opposite to it. Such a stator winding can also be referred to as a hair pin winding. The end sections 9a to 9d, 10a to 10d are formed in one piece with a respective form conductor 36 of a partial winding. The remaining form conductors 36 of the partial windings are connected in pairs on the end face 6a by connections formed in one piece with them. On the end face 6b, the shaped conductors 36 are bonded together in pairs.

14 and 15 are each a schematic diagram of a sectional view of a second embodiment of a stator 1 and a second embodiment of the insulation device 2. All statements relating to the previously described embodiment can be transferred to the second embodiment, with the same or equivalent components being provided with identical reference symbols.

As 14 can be removed, the insulation arrangement 24 in the second exemplary embodiment has a connecting section 25g which adjoins the first section 25a and which extends along a plane lying parallel to the body 20 . The second portion 25b extends away from the connecting portion 25g concentrically with the first portion 25a. The second section 25b is set up to the first star point connection 11 on the winding to surround head 7 facing away from the first star point connection 11, so that the first section 25a and the second section 25b surround the first star point connection 11 on both sides. The connecting section 25g has through-openings 37a, through which star-point connections of the stator winding 4 or the end sections 10a, 10b can be passed.

As 15 can be removed, the insulation arrangement 24 in the second exemplary embodiment also has a connection section 25h which adjoins the third section 25c and which extends along a plane lying parallel to the body 20. The fourth section 25d extends away from the connecting section 25h concentrically with the third section 25c. The fourth section 25d is set up to surround the second star point connection 12 on the side of the second star point connection 12 facing away from the end winding 7, so that the third section 25c and the fourth section 25d surround the second star point connection 12 on both sides. The connecting section 25h has through-openings 37b, through which star-point connections of the stator winding 4 or the end sections 10c, 10d can be passed.

According to a further embodiment, the first section and the second section correspond to the first embodiment and the third section and the fourth section correspond to the second embodiment. According to a further embodiment, the first section and the second section correspond to the second embodiment and the third section and the fourth section correspond to the first embodiment.

16 is a schematic diagram of an embodiment of a vehicle 100 with an embodiment of an electric machine 101.

The electric machine 101 is set up to drive the vehicle 100 and has a stator 1 according to one of the exemplary embodiments described above and a rotor 102 rotatably mounted within the stator 1 . The electrical machine 101 is designed, for example, as an asynchronous machine or as a permanently excited synchronous machine. Electric machine 101 forms part of a drive train of vehicle 100 . The vehicle 100 may be a battery electric vehicle (BEV) or a hybrid vehicle.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• US 2013/0147306 A1 [0004]

Claims (15)

Insulation device (2) for electrically insulating a winding overhang (7) of a stator winding (4) from connection elements (8a-c) for electrical connections of the stator winding (4), the insulation device (2) having a plate-shaped body (20) which - a first side (21) arranged to extend circumferentially at least partially over an axial end of the end winding (7), - a second side (22) located opposite the first side (21) and on which the connection elements (8a-c) can be arranged, and - at least one recess (23a, 23b) which extends from the first side (21) to the second side (22) and through which at least one of the connections can be connected from the first side (21 ) can be carried out in order to be electrically conductively connected to one of the connection elements (8a-c) on the second side (22), characterized by an insulation arrangement (24) which has a first section (25a) which differs from the he most side (21) of the body (20) in a direction pointing away from the second side (22), and is set up to close the end winding (7) along its circumference on one of two radial sides of the end winding (7). surround. isolation device claim 1 , wherein the insulation arrangement (24) has a second portion (25b) extending from the first side (21) of the body (20) in the direction away from the second side (22), and is adapted to a the radial side of the end winding (7) arranged first star point connection (11) for the stator winding (4) on the side of the end winding (7) facing away from the first star point connection (11), so that the first section (25a) and the second section ( 25b) surround the first star point connection (11) on both sides. isolation device claim 1 , wherein the insulation arrangement (24) further comprises a connection section (25g) adjoining the first section (25a) and extending along a plane parallel to the body (20), and a second section (25b) extending from the connection section (25g) extending concentrically to the first section (25a), the second section (25b) being set up to have a first star point connection (11) arranged on the radial side of the end winding (7) for the stator winding (4) on the to surround the side of the first star point connection (11) facing away from the end winding (7), so that the first section (25a) and the second section (25b) surround the first star point connection (11) on both sides. Insulation device according to one of the preceding claims, wherein the insulation arrangement (24) has a third section (25c) which extends, in particular concentrically to the first section (25a), from the first side (21) of the body (20) into that from the second Side (22) extends pioneering direction, and is adapted to surround the (7) end winding along its circumference on the radial side or the other of the radial sides of the end winding (7). isolation device claim 4 wherein the insulation assembly (24) has a fourth portion (25d) extending from the first side (21) of the body (20) in the direction away from the second side (22) of the body (20), and to is set up, a second star point connection (12) for the stator winding (4) arranged on the radial side of the end winding (7), which is surrounded by the third section (25c), on the side of the second star point connection ( 12) so that the third section (25c) and the fourth section (25d) surround the second star point connection (12) on both sides. isolation device claim 4 , wherein the insulation arrangement (24) further comprises a connection section (25h) adjoining the third section (25c) and extending along a plane parallel to the body (20), and a fourth section (25d) extending from the connection section (25h) extending concentrically to the third section (25c), the fourth section (25d) being adapted to have a second one arranged on the radial side of the end winding (7) which is surrounded by the third section (25c). To surround star point connection (12) for the stator winding (4), so that the third section (25c) and the fourth section (25d) surround the second star point connection (11) on both sides. Isolation device according to one of claims 2 until 6 wherein the body (20) has a plurality of through openings (32a-d) through the first (21) and second (23) sides, the through openings being located at locations where two of the sections (25a-f) of the insulation assembly (24) run concentrically to one another and/or are arranged at points which lie in the middle between four recesses (23a, 23b) arranged in a rectangular grid. Isolation device according to one of the preceding claims, wherein the body (20) has an arcuate course. Insulation device according to one of the preceding claims, in which each recess (23a, 23b) has an edge (30) with a projection (31) directed into the recess (23a, 23b). Insulation device according to one of the preceding claims, wherein a receiving space (34a-c) is formed for a respective connection element (8a-c) on the second side (22) of the body (20), which is set up to prevent a movement of the connection element (8a -c) with respect to the second side (22) in a received state in the receiving space (34a-c), wherein the receiving space (34a-c) in particular - one or more projections (35a) for inhibiting a rotational movement of the connecting element (8a-c) about an axis of rotation perpendicular to the second side (22) and/or - a projection (25b) for inhibiting a translational movement of the connection element (34a-c) along the second side (22). Insulation device according to one of the preceding claims, wherein the body (20) has a further recess (33a) in which a sensor (13) arranged on the winding overhang (7) can be received, wherein along an edge contour of the recess (33a) on the second side ( 22) a projection (33b) for guiding the sensor (13) is formed. Stator (1) for an electrical machine (101), having - a stator core (3), - a stator winding (4) which has a plurality of partial windings forming a winding overhang (7) on an axial end face (6a) of the stator core (3) and strands of the stator (1), each partial winding having an end section (9a-d) which includes a free end of the partial winding, which protrudes from the stator core (3) on the end face (6a) and forms a connection of one of the strands, - a connection arrangement (5) which has a number of connection elements (8a-c) corresponding to the number of strands, a respective connection element (8a-c) connecting the end sections (9a-d) of the partial windings of one of the strands, and - An insulation device (2) according to one of the preceding claims for electrically insulating the winding overhang (7) of the stator winding (4) from the connection elements (8a-c), the insulation device (2) being arranged on the axial end of the winding overhang (7). . stator after claim 12 , each partial winding having a further end section (10a-d), which encompasses another free end of the partial winding, protrudes from the end face (6a) of the stator core (3) and forms a star point connection of the partial winding, whereby - the star point connection forming end sections (10a, 10b) of a part of the partial windings on an inner radial side of the end winding (7) and the stator (1) also has a first star point connection (11) through which the end sections (10a, 10b) forming the star point connection of the part of the partial windings are connected to one another, and/or - the end sections (10c, 10d) of part of the partial windings forming the star point connection extend on an outer radial side of the end winding (7), the stator (1) also having a second star point connection (12 ) has, through which the end sections (10c, 10d) forming the star point connection of the part of the partial windings mi are connected to each other. stator after claim 12 or 13 , wherein - the stator (1) also has a sensor (13) and/or - a plurality of slots (3a) arranged in the circumferential direction are formed in the stator core (3) and/or - each partial winding has a plurality of shaped conductors (36) which extending along an axial direction through the stator core (3). Electrical machine (101) for driving a vehicle (100), comprising a stator (1) according to one of Claims 12 until 14 and a rotor (102) rotatably supported within the stator.

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