Arrangement of slot insulations in stator slots of a stator for a plug-in coil winding of an electric motor as well as slot insulation, electric motor and motor vehicle with electric motor

Abstract

The invention relates to an arrangement of slot insulations (22) in stator slots (10) of a stator for a plug-in coil winding of an electric motor, wherein the stator has a laminated core (12) which delimits a receiving space (18) designed to receive a rotor, wherein the stator slots (10) are arranged in the laminated core (12), which extend along an axial direction (14) of the stator and have, on a slot side (24) of a slot wall (16) facing the receiving space (18), a slot-shaped recess (26) through which each stator slot (10) is open towards the receiving space (18), and each slot insulation (22) is folded several times along the axial direction (14) to form an overlapping region (20) and is arranged on the slot wall (16) in such a way that the recess (26) is covered on the stator slot side by the slot insulation (22).Furthermore, the overlap region (20) of a respective slot insulation (22) of a respective stator slot (10) is arranged on a side of the slot wall (16) different from the slot side (24).

Description

[0001] The invention relates to an arrangement of slot insulations in stator slots of a stator for a plug-in coil winding of an electric motor. The stator has a laminated core which forms a wall that delimits a receiving space designed to accommodate a rotor in a circumferential direction. The stator slots are arranged distributed circumferentially in the wall, each of which is designed to accommodate conductor elements of the plug-in coil winding and each of which extends along an axial direction of the stator. The stator slots each have, in their slot wall, on a slot side facing the receiving space, a slot-shaped recess extending in the axial direction, through which each stator slot is open towards the receiving space. Overall, the slot wall (viewed in cross-section from within the stator slot) has a slot bottom arranged opposite its slot side and two longitudinal sides.Each slot insulation is folded several times along the axial direction, forming an overlapping area. It is arranged on the respective slot wall bordering the stator slot in such a way that the recess (usable slot) is covered by the slot insulation on the stator slot side.

[0002] The invention also relates to a slot insulation for an arrangement, an electric motor and a motor vehicle.

[0003] DE 10 2019 003 258 A1 shows a slot insulation for an electrical machine, in particular for a stator of an electric motor, wherein an insulating paper or a slot insulation is folded over one another in multiple layers with its two ends adjacent to a slot exit of a slot or stator slot of the electrical machine, in which electrically conductive windings can be arranged.

[0004] DE 10 2017 218 451 A1 shows a stator with a stator laminated core with slots, wherein an electrically insulating support element of a slot insulation is arranged in each of the slots, which receives a number of electrical conductors of an electrical winding, and wherein at least one conductive shielding element of the slot insulation, arranged on the slot opening side, is arranged on the support element.

[0005] DE 10 2020 104 163 A1 shows a stator for an electrical machine, with a stator body and a winding arrangement, wherein the stator body has a plurality of slots, wherein the winding arrangement has a plurality of conductor packets, each of which is arranged separately in one of the slots, wherein each conductor packet has a plurality of conductors lying one above the other and is electrically insulated from the stator body by an insulating paper or a slot insulation, wherein the insulating paper is arranged overlapping in an overlapping region, and wherein the overlapping region is arranged between the two adjacent conductors of one of the conductor packets.

[0006] The invention is based on the object of reducing the manufacturing effort of a stator for a plug-in coil winding of an electric motor for a motor vehicle, for an electric motor with the stator and for a motor vehicle with the electric motor and at the same time increasing the process reliability in the production of the same.

[0007] The problem is solved by the subject matter of the independent patent claims. Advantageous developments of the invention are described by the dependent patent claims, the following description, and the figures.

[0008] In newer electric motors, particularly those used to power electric vehicles, the stator does not have wire coils wound from copper wire with a circular cross-section to generate magnetic fields. Instead, the magnetic fields in the stator are generated using a multitude of plug-in coils made from flat copper wire, i.e., copper wire with a rectangular cross-section each. In a stator with plug-in coils, individual conductor elements (copper wires or aluminum wires) are packed more densely, meaning that an electric motor with a stator with plug-in coils has more copper per unit volume than an electric motor with a stator with wound round wire coils. This increases power and torque for the same motor volume, i.e., power density.

[0009] Due to the spatially densely packed arrangement of the plug-in coils, they must, on the one hand, be insulated from one another, for example, by a current-inhibiting coating or insulation. On the other hand, the plug-in coils must be insulated from a stator laminated core so that current cannot flow through the stator core via the plug-in coils. This laminated core forms the soft magnetic core of the stator-side magnetic circuit of the electrical machine. Within the laminated core, the conductor elements of the plug-in coils are arranged in so-called stator slots, the slot walls of which must be electrically insulated from the conductor elements by slot insulation. The invention concerns the arrangement of such slot insulation in a stator slot.

[0010] The invention further develops the arrangement described at the outset in that the overlapping region of a respective slot insulation of a respective stator slot is arranged on a side of the slot wall different from the slot side.

[0011] During the production of a stator for an electric motor with a plug-in coil winding, the respective slot insulations are folded and preferably inserted one at a time into one of the stator slots. The respective slot insulations are intended to line the respective stator slots, i.e. they can be arranged or can be in contact with the inside of the respective slot walls. After the slot insulations have been inserted into the stator slots, the manufacturing process provides for the conductor elements of the plug-in coils to be inserted or shot into the stator slots. The plug-in coils can have so-called I-pins, each with one conductor element, or hairpins (due to their hairpin, i.e. U-shape) each with two conductor elements. These plug-in coils or the conductor elements of the plug-in coils are intended to be insulated from the laminated core by the slot insulation when inserted into the stator slots or in the finished state of the electric motor.The material of the laminated core between two directly adjacent stator slots serves as a coil core for plug-in coils inserted into these slots and through which current flows. To prevent magnetic short circuits, the stator slots are each slotted along the entire axial length of the laminated core, i.e., in the axial direction, towards the receiving space in which the rotor is to be arranged in the finished state of the electric motor. This means that they are not connected and thus open towards the receiving space. For the sake of simplicity, the slot-shaped recess is also referred to below as a slot. The corresponding side of the slot wall in which the slot is located is referred to accordingly as the slot side.Since the conductor elements of the plug-in coils are generally rectangular in shape (flat wire), the stator slots can also each have a rectangular or substantially rectangular cross-section, in which the conductor elements, when inserted into the stator slots, can be arranged, for example, in a row or in a single row. The receiving space, in which the rotor is to be arranged rotatably or rotatably in the finished state of the electric motor, is generally round in shape, and the rectangular cross-sections of the stator slots are aligned with the rotor's axis of rotation. In other words, the stator slots are arranged on a circular path in the circumferential direction of the laminated core in the laminated core and are aligned with the pivot point or axis of rotation of the rotor.The cross-section of a rectangular stator slot has two longitudinal sides, the central axis of which is aligned in the radial direction of the stator towards the pivot point or the axis of rotation of the rotor, the slot side facing the receiving space, which is open to the receiving space through the slot, and a side opposite the slot side, which is referred to as the slot bottom.

[0012] To ensure that the conductor elements arranged in a stator slot are insulated from the laminated core in the finished state, the slot insulation arranged in each stator slot over the entire stator length or the entire axial extent of the stator slot must completely line or cover the slot wall so that the conductor elements do not come into direct electrical contact with the slot wall, i.e. the laminated core. The slot insulation can be made from a sheet of paper or a single- or multi-layer film that is folded four times, for example, to match the dimensions of the useful walls so that the folded edges of the slot insulation lie in the corners of the stator slot. To ensure that the slot insulation completely lines each stator slot, the slot insulation can have an overlap area.

[0013] After the plug-in coils have been inserted into the stator slots, the manufacturing process for an electric motor with plug-in coil winding requires that the stator is impregnated, for example, using an immersion or trickle impregnation process with an impregnating material such as an impregnating resin such as epoxy resin or polyester resin. If the overlapping area of ​​the slot insulation is now located on the slot side, the slot insulation, which was folded and inserted into each stator slot, can unfold during the subsequent drying of the impregnating material. This drying process can result in a stiffening of the slot insulation. In particular, it can unfold into the slot and even unfold beyond the slot into the receiving space. In other words, part of the slot insulation can protrude through the slot into the receiving space.Since the slot insulation can be harder, especially after the impregnation material has cured, than before curing, the rotor can be damaged during rotation in the finished electric motor, for example, during operation. If such protrusion is detected before assembly of the electric motor, the unintentional unfolding of the slot insulation into the receiving space will at least generate additional work and thus increase the manufacturing effort for the stator and / or the electric motor.

[0014] According to the invention, the overlapping area is arranged on a side different from the slot side. In other words, the folded slot insulation is inserted into a stator slot or into each stator slot such that the overlapping area is arranged on a side different from the slot side, i.e., not on the slot side. This provides the advantage that the slot insulation cannot unfold through the slot into the receiving space. In the overlapping area, the slot insulation can be multi-layered, in particular two-layered.

[0015] The invention also includes embodiments or further developments which result in additional advantages.

[0016] A further development provides that the overlapping area is arranged starting on a side of the respective groove wall opposite the respective slot side, the groove bottom.

[0017] The overlap area refers to the area where the two ends of the folded slot insulation come to rest, viewed in its cross-section perpendicular to the axial direction. The slot insulation overlaps in this area. Viewed in cross-section, the slot floor is the side opposite the slot side.

[0018] This has the advantage that the slot insulation cannot protrude into the receiving space, especially after the impregnation material has hardened.

[0019] The overlap region comprises at least one outer layer, "outer" in the sense of "adjacent to the slot wall," and an inner layer, which is arranged adjacent to a side of the outer layer facing into the stator slot. The overlap region begins where the outer layer touches the end of the inner layer, viewed in cross-section, and extends to the end of the outer layer.

[0020] The overlap area can therefore begin at the groove bottom and extend along the groove bottom, i.e. be arranged adjacent to the groove bottom.

[0021] A further development of the invention, however, provides that the overlapping area extends along one of the two long sides of the respective groove wall. In other words, the inner and outer layers begin to overlap at the groove bottom, and the outer layer extends along one of the two long sides of the groove wall.

[0022] In contrast to the complete arrangement of the overlapping area along the slot bottom, this offers the advantage that even if the overlapping area, particularly the outer layer of the overlapping area, swells or expands, an opposite area of ​​the slot insulation that rests against the slot side cannot be pressed into the receiving space, even though no open end is arranged there. In other words, the slot insulation expands at most into the stator slot if the overlapping area is arranged along one of the side walls of a stator slot in which the conductor elements are arranged in the finished state. This ensures that the slot insulation does not protrude into the receiving space.

[0023] A further development of the invention provides that each slot wall has a recess extending along the axial direction to accommodate the overlapping area. In other words, the stator slot, or the cross-section of the stator slot or each stator slot, should be enlarged in the area of ​​the overlapping area, i.e., where the overlapping area or the outer layer of the overlapping area rests against the slot wall, i.e., have a recess.

[0024] This results in the advantage that a plug-in area provided for the conductor elements of the plug-in coils, i.e. a receiving area for the conductor elements, framed by the slot insulation when viewed in cross-section, is not reduced in size by the overlapping area, so that plugging in the conductor elements is particularly easy, even if the slot insulation overlaps in the area of ​​the overlapping area.

[0025] The invention comprises a slot insulation for one of the described arrangements according to the invention, wherein each slot insulation has at least four folds running in the axial direction. In other words, the slot insulation should be folded at least four times. A fold here refers to a folded edge along which the slot insulation is folded. If the folded slot insulation has a rectangular cross-section, each fold corresponds to a corner. The at least four folds result in the advantage that the slot wall of each stator slot can be completely lined by a slot insulation arranged therein, in particular if the two ends, viewed in a cross-section of the slot insulation, overlap and thus form the overlapping region or regions. To fold a slot insulation, a person skilled in the art can use already known folding machines.

[0026] The slot insulation can be made, for example, from so-called Nomex® paper (Nomex: registered trademark), i.e., a heat-resistant paper made of aramid fiber. Alternatively, the slot insulation can be made of kraft paper, a common paper made of wood fibers, impregnated with resins, for example. Alternatively, the slot insulation can be made of laminate materials, i.e., have a layered structure. For example, the slot insulation can have two outer layers of aramid paper, i.e., a paper made of aramid fiber, such as Nomex® paper, and a middle layer between the two outer layers can be a polyimide film.

[0027] The thickness of the slot insulation can be, for example, 0.1 to 0.3 millimeters, in particular 0.22 millimeters.

[0028] A further development of the slot insulation provides that each slot insulation has a second cross-sectional shape corresponding to a first cross-sectional shape of the respective stator slots, which second cross-sectional shape has four sides, two insulation long sides and two insulation short sides which are shorter than the insulation long sides and the overlap region extends along one of the insulation long sides.

[0029] The invention comprises an electric motor with the arrangement according to the invention and with the slot insulation according to the invention.

[0030] The electric motor is designed in particular as a traction machine, i.e. as a drive motor, for a motor vehicle.

[0031] The invention also includes a motor vehicle with the electric motor according to the invention.

[0032] The motor vehicle according to the invention is designed, for example, as a motor vehicle, in particular as a passenger car or a commercial vehicle. The motor vehicle is preferably an electric vehicle or hybrid vehicle, i.e., a vehicle that has at least one electric motor as a drive device. The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle.

[0033] The invention also encompasses combinations of the features of the described embodiments. The invention therefore also encompasses implementations that each comprise a combination of the features of several of the described embodiments, unless the embodiments are described as mutually exclusive.

[0034] Exemplary embodiments of the invention are described below. Shown are: Fig. 1 a schematic sectional view of a stator slot with inserted slot insulation with an overlapping area arranged on a longitudinal side of a slot wall; Fig. 2 a schematic sectional view of a stator slot with inserted slot insulation with an overlap region arranged starting at a slot bottom; Fig. 3 a schematic sectional view of a stator slot with inserted slot insulation with an overlap region arranged starting at a slot bottom and accommodated in a recess of the slot wall; Fig. 4 schematic representation of several stator slots, partly with inserted slot insulation with overlapping area and recess;

[0035] The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that can be considered independently of one another, each of which also develops the invention independently of one another. Therefore, the disclosure is intended to encompass combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0036] In the figures, the same reference symbols designate elements with the same function.

[0037] Fig. 1 shows a schematic sectional view of a stator slot 10 in a laminated core 12 with slot insulation 22 inserted into the stator slot 10. The slot insulation 22 can lie directly against a slot wall 16 of the stator slot 10, but for the sake of clarity is shown in the Fig. 1 to 3 are shown spaced apart therefrom. The slot wall 16 can have a slot side 24, which in turn has a slot-shaped recess 26 or a slot, as well as two longitudinal sides 30 and a side arranged opposite the slot side 24, the slot bottom 28. The stator slot 10 can be connected to the receiving space 18 via the slot-shaped recess 26. The receiving space 18 can be delimited by the laminated core 12 and the stator slots 10 arranged therein distributed in a circumferential direction 15 and can be designed to receive a rotor for an electric motor. The respective stator slots 10 and the slot insulation 22 arranged therein can be located in the Fig. 1 to Fig. 3 in an axial direction 14 over the entire height of the laminated core 12 of the stator. The slot-shaped recess 26 can also extend over the entire height of the laminated core 12, i.e., over a length of the stator slot 10 in the axial direction 14. The slot insulation 22 can be formed into a shape corresponding to the cross-sectional shape of the stator slot 10, as shown in Fig. 1 shown a rectangular shape, folded. The folds of the slot insulation 22, in Fig. 1 to Fig. 3 indicated by the corners of the slot insulation 22, can extend over the entire height in the axial direction 14 of the slot insulation 22. The slot insulation 22 can have two insulation long sides 32 and two insulation short sides 34. As in Fig. 1 to Fig. 3, the slot insulation 22 can be designed in a single layer, except for an overlapping area 20. The overlapping area 20 can be characterized in that the slot insulation 22 overlaps starting from a first end 36 to a second end 38. As shown in Fig. 1, the overlapping area 20 can be arranged on a side of the groove wall 16 different from the slot side 24. In Fig. 1 is the overlap area 20 along a longitudinal side 30 of the groove wall 16, in Fig. 1 on the left longitudinal side 30. After inserting the slot insulation 22 into the respective stator slots 10 and subsequently inserting conductor elements of plug-in coils into the stator slots, more precisely into a cavity enclosed by the slot insulation 22 arranged in the respective stator slots 10, it can be provided that the stator is impregnated, for example, with epoxy resin. This can cause stresses to arise in the slot insulation 22, which can become saturated with the impregnation material, for example, the epoxy resin, so that the second end 38 folds out in the overlap region 20. As shown in Fig. 1, however, when the overlapping area 20 is unfolded, no part of the slot insulation 22, in particular not the second end 38, can fold into the receiving space 18 because it is arranged on the left longitudinal side 30.

[0038] Fig. 2 shows a schematic sectional view of a stator slot 10 with inserted slot insulation 22, wherein, in contrast to Fig. 1 the overlap region 20 in this embodiment can be arranged starting at the groove bottom 28. As in Fig. 2, the overlap region 20 may begin at a first end 36 of the slot insulation 22, from which the slot insulation 22 overlaps, and extend to the second end 38. As shown in Fig. 2, the overlapping area 20 can extend starting from the groove bottom 28 along a longitudinal side 30, in Fig. 2, for example, along a right-hand longitudinal side 30 of the groove wall 16. Alternatively, the overlap region 20 can extend starting at the groove bottom 28 along the groove bottom 28. In this embodiment, i.e. in which the overlap region 20 extends along the groove bottom 28, the entire overlap region is arranged along the groove bottom 28. An advantage of the arrangement of the overlap region 20 starting at the groove bottom 28 and extending along a longitudinal side 30 is that when the overlap region 20 is unfolded, the slot insulation 22 to the left, relative to the illustration in Fig. 2, is pressed in. Since, in the finished state of the stator or the electric motor of which the stator is a part, the conductor elements are inserted into the stator slots 10, the slot insulation 22 cannot be pressed out of the stator slot 10 into the receiving space 18, even if the overlap region 20 is unfolded, in particular not the short side 34 of the insulation, which is arranged on the slot side 24 of the slot wall 16. This could be the case if the overlap region were arranged, for example, beginning and extending along the slot bottom 28.

[0039] Fig. 3 shows a schematic sectional view of a stator slot 10 with inserted slot insulation 22, as in Fig. 2, with a groove base 28 beginning and extending along a longitudinal side 30, in particular the one as shown in Fig. 3, a right longitudinal side 30 may be arranged extending. In contrast to Fig. 2, the stator slot 10 is in Fig. 3 corresponding to the overlap region 20, i.e. also beginning at the groove bottom 28 and extending along the right-hand longitudinal side 30 of the groove wall 16, has a recess 40. The recess 40 can be a cutout in the laminated core 12 that corresponds to the shape of the overlap region 20. In the overlap region, the slot insulation 22 can be thicker than in the remaining region of the slot insulation 22, because here two layers of the slot insulation 22 can be arranged one above the other or next to one another. The recess 40 can compensate for the increased thickness of the slot insulation 22 in the overlap region 20 in such a way that the outer or second layer, which extends starting from the groove bottom 28 to the second end 38, can be accommodated in the recess 40.As a result, the space enclosed or limited by the slot insulation 22 adjacent to the slot wall 16 for accommodating conductor elements cannot be cramped or reduced in size, so that the conductor elements can be inserted as well as possible into the stator slot 10 lined with the slot insulation 22, since the thicker overlapping area 20 does not extend into this space, but into the recess 40.

[0040] Fig. Figure 4 shows a schematic representation of several stator slots 10, wherein in two of the four stator slots shown in Fig. 4 slot insulations 22 are located. In other words, an incomplete arrangement of the slot insulations 22 in the respective stator slots is shown here. For the sake of clarity, Fig. 4 only one of the two stator slots 10 with inserted slot insulation 22 is provided with a reference symbol and only one of the stator slots 10 without inserted slot insulation 22. Fig. Figure 4 shows how the stator slots 10 can be distributed along a circumferential direction 15 in the laminated core 12. The circumferential direction 15 indicates that the receiving space can be circular around a rotational axis of a rotor running in the axial direction 14. Due to the circular arrangement of the stator slots 10 in the laminated core 12, a rear region of the laminated core 12 between two longitudinal sides 30 of adjacent stator slots 10, for example in a region directly adjacent to the slot bottom 28, is thicker than in a front region or region located closer to the receiving space 18 between two adjacent stator slots 10. Therefore, it can be particularly advantageous, as in Fig. 4, the recess 40 is arranged in a region of a longitudinal side 30 near the groove bottom 28. Thus, a higher strength can be ensured despite a reduction of material or the laminated core 12 in the region of the recess 40. As shown in Fig. 4, the overlapping area 20 can be arranged in the area of ​​the recess 40 in order to allow the insertion of line elements of the plug-in coils into a stator slot 10 lined with a slot insulation 22. As shown in Fig. 4, the slot insulation 22 can project beyond the laminated core 12 in the axial direction 14, in particular on both sides, i.e., a top side and a bottom side of the laminated core 12. For example, the top side can be the side of the laminated core 12 that is in Fig. 4 is shown in a plan view and opposite on a not shown Fig.The underside can be located on the side shown in Figure 4. The laminated core can be constructed from individual layers or laminations, i.e. have a layer structure made up of several laminations, each of which can be insulated from one another, for example by a powder coating. The length of a long side 30 of a stator slot, i.e. the distance from the slot side 24 to the slot bottom 28, can be 15 to 17 millimeters, in particular 16.45 millimeters. The distance between two long sides 30 of a stator slot 10, in an area in which there is no recess 40, can be, for example, four to five millimeters, in particular 4.3 millimeters. In the area of ​​the recess 40, the width of a stator slot 10, i.e. the shortest distance between a long side 30 of a stator slot and a side of the recess 40, can be 0.2 to 0.5 millimeters wider, in particular 4.54 millimeters.

[0041] A particularly preferred embodiment is described below.

[0042] As is known from the prior art, slot insulations or slot insulations 22 made of paper can open during the manufacturing process. As a result, these insulations, such as an insulating material, can even extend into the rotor chamber, which can also be referred to as the receiving chamber 18.

[0043] As a new solution, the geometry of the slot insulation or slot insulation 22 can be modified such that the upper hook or the outer layer of the overlap region 20, i.e., the layer closest to the groove wall, is longer than in the prior art and is folded in. Optionally, the insulation or slot insulation 22 can be positioned with the head facing down or toward the groove bottom 28. This can have the advantage of reducing rework and / or wear.

[0044] Overall, the examples show how optimized slot insulation or slot insulation can be provided. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 003 258 A1

[0003] DE 10 2017 218 451 A1

[0004] DE 10 2020 104 163 A1

[0005]

Claims

[1] Arrangement of respective slot insulations (22) in respective stator slots (10) of a stator for a plug-in coil winding of an electric motor, wherein the stator has a laminated core (12) which forms a wall delimiting a receiving space (18) designed to receive a rotor in a circumferential direction (15), and wherein the stator slots (10) are arranged distributed in the wall in the circumferential direction (15), which are each designed to receive conductor elements of the plug-in coil winding and each extend along an axial direction (14) of the stator and each have, on a slot side (14) of its slot wall (16) facing the receiving space (18), a slot-shaped recess (26) extending in the axial direction (14), through which each stator slot (10) is open towards the receiving space (18), wherein the slot wall (16) has as sides the slot side (24), a slot side opposite this groove bottom (28) and two long sides (30),and each slot insulation (22) is folded several times along the axial direction (14) to form an overlapping region (20) and is arranged on the respective slot wall (16) in such a way that the recess (26) is covered by the slot insulation (22) on the stator slot side, , characterized by that the overlapping region (20) of the respective slot insulation (22) of the respective stator slot (10) is arranged on a side of the slot wall (16) different from the slot side (24). [2] Arrangement according to claim 1, wherein the overlap region (20) is arranged starting on a side of the respective groove wall (16) opposite the respective slot side (24), the groove bottom (28). [3] Arrangement according to claim 2, wherein the overlap region (20) extends along one of the two longitudinal sides (30) of the respective groove wall (16). [4] Arrangement according to one of the preceding claims, wherein each groove wall (16) has a recess (40) extending along the axial direction (14) for receiving the overlap region (20). [5] Slot insulation (22) for an arrangement according to one of claims 1 to 4, wherein each slot insulation (22) has at least four folds extending in the axial direction (14). [6] Slot insulation (22) according to claim 5, wherein each slot insulation (22) has a second cross-sectional shape corresponding to a first cross-sectional shape of the respective stator slots (10), which second cross-sectional shape has four sides, two insulation long sides (32), and two insulation short sides (34) which are shorter than the insulation long sides (32), and the overlap region (20) extends along one of the insulation long sides (32). [7] Electric motor with an arrangement according to one of claims 1 to 4 and a slot insulation (22) according to one of claims 5 to 6. [8] Motor vehicle with an electric motor according to claim 7.

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