Stator for an electric motor, electric motor having a stator

Abstract

The invention relates to a stator (1) for an electric motor, comprising a laminated core (2) and at least one stator winding (3), wherein the stator winding (3) is arranged within a slot (4) of the laminated core (2), characterised in that the laminated core (2) comprises at least one first lamination section (5) having at least one first cooling channel section (6) and a first slot (11), and at least one second laminated section (7) having at least one second cooling channel section (8) and a second slot (12), wherein the first cooling channel section (6) is fluidically connected to the second cooling channel section (8) such that a cooling liquid flows from the first cooling channel section (6) into the second cooling channel section (8); wherein the second cooling channel section (8) has an opening (9) which is fluidically connected to the second slot such that the cooling liquid flows into the slot (4) of the laminated core (2) in order to cool the at least one stator winding (3), or wherein the first cooling channel section (20) has multiple parts and has an opening (21) which is fluidically connected to the first slot (11) such that the cooling liquid flows into the slot (4) of the laminated core (2) in order to cool the at least one stator winding (3). The invention further relates to an electric motor having such a stator.

Description

[0001] P241384 DE01

[0002] - 1 -

[0003] Stator for an electric motor, electric motor with a stator

[0004] The invention relates to a stator for an electric motor, comprising a laminated core and at least one stator winding, wherein the stator winding is arranged within a slot of the laminated core, and to an electric motor with such a stator.

[0005] Stators for electric motors are generally known from the prior art. Due to heat generation, the power output of electric motors must be limited. The stators, in particular, generate a high level of heat, which can lead to the windings burning out.

[0006] In this context, it has now become apparent that there is a need to provide a stator for an electric motor, in particular a need to provide an improved stator for an electric motor.

[0007] It is therefore an object of the present invention to eliminate, or at least partially eliminate, the disadvantages of stators described above. In particular, it is an object of the present invention to provide an improved stator.

[0008] This problem is solved in a stator of the generic type according to the invention in that the laminated core comprises at least a first laminated core section with a first cooling channel section and a first groove and at least a second laminated core section with a second cooling channel section and a second groove, wherein the first cooling channel section is fluidly connected to the second cooling channel section, so that a cooling fluid flows from the first cooling channel section into the second cooling channel section; wherein the second cooling channel section has an opening that is fluidly connected to the second groove, so that the cooling fluid flows into the groove of the laminated core for cooling the at least one stator winding, or wherein the first cooling channel section is multi-part and has an opening that is fluidly connected to the first groove, so that the cooling fluid flows into the groove of the laminated core for cooling the at least one stator winding.P241384 DE01.

[0009] - 2 -

[0010] Furthermore, the problem is solved by an electric motor having the features of independent claim 10.

[0011] Features disclosed in connection with the stator according to the invention naturally also apply in connection with the electric motor according to the invention, and vice versa, so that the disclosure of the individual aspects of the invention always makes or can make reciprocal reference.

[0012] According to a first aspect of the present invention, a stator for an electric motor is provided with a laminated core and with at least one stator winding, wherein the stator winding is arranged within a slot of the laminated core, wherein the laminated core comprises a first laminated section with at least one first cooling channel section and at least one first slot and at least one second laminated section with at least one second cooling channel section and at least one second slot, wherein the first cooling channel section is fluidly connected to the second cooling channel section, such that a cooling fluid flows from the first cooling channel section into the second cooling channel section;wherein the second cooling channel section has an opening which is fluidically connected to the second slot, so that the coolant flows into the slot of the laminated core for cooling the at least one stator winding or wherein the first cooling channel section is multi-part and has an opening which is fluidically connected to the first slot, so that the coolant flows into the slot of the laminated core for cooling the at least one stator winding.;

[0013] Preferably, a corresponding first cooling section with a first slot and a corresponding second cooling section with a second slot are distributed around the circumference of the stator at each slot.

[0014] Preferably, the second cooling section in a multi-part first cooling channel section can be arranged in the sheet metal section in such a way that it separates individual parts P241384 DE01

[0015] - 3 - of the multi-part executed first cooling channel section, which is fluidically connected.

[0016] In this context, the term "laminate stack" refers in particular to a large number of laminated sections arranged in a row to optimize the magnetic properties of the stator.

[0017] In this context, the term "sheet metal section" refers specifically to a thin sheet metal element. The sheet metal section can be made of a metal, steel, particularly silicon steel.

[0018] The term stator winding refers in particular to a coil winding that is arranged in the stator and generates a magnetic field when current flows.

[0019] The term groove refers in particular to a recess extending longitudinally along the stator for receiving the stator winding.

[0020] In this context, the term "cooling section" refers to a channel for conveying a coolant. The cooling section can be a single piece or multiple pieces. It preferably only partially penetrates the sheet metal section in the radial direction. This partial radial penetration ensures the stability of the sheet metal section. Furthermore, the magnetic properties of the stator are not significantly impaired, as would be the case with complete penetration. The cooling section is preferably inserted into the sheet metal section by a punching process. This allows for cost-effective manufacturing compared to drilling. Additionally, punching avoids the generation of chips that would otherwise require time-consuming removal from the sheet metal section.

[0021] The fluid flow connection between the first cooling section and the second cooling section can preferably be achieved in a cost-effective and efficient manner by at least partially overlapping the two cooling sections in an assembled state of the sheet metal sections. P241384 DE01

[0022] - 4 -

[0023] In this context, the term "coolant" refers to a liquid that can absorb and dissipate heat from the stator. The coolant could, for example, be an oil. The coolant can be circulated, for instance, by a pump. Within the stator housing, a channel could be provided, for example, to transport the coolant to one of the cooling sections. After passing through the stator winding, the coolant could, for example, be collected in a reservoir and then pumped back into the stator for cooling. In this way, a cooling circuit can be advantageously implemented in an efficient manner.

[0024] The invention is based on the understanding that stators generate heat during the operation of an electric motor, which must be dissipated to prevent overheating of the stator or stator windings. The invention proposes providing the lamination stack sections with offset and partially overlapping cooling sections, forming a cooling channel that penetrates the lamination stack radially from its surface to the groove, allowing the coolant to enter and flow through the stator windings for cooling. By providing partially overlapping cooling sections within the lamination stack sections, a cooling channel can advantageously be manufactured cost-effectively. Furthermore, the efficiency of the lamination stack, which plays a role in shaping the magnetic field, is not significantly impaired. In this way, a highly efficient and cost-effective cooled stator is provided overall.

[0025] Advantageous embodiments are claimed in the dependent claims and are explained in more detail below.

[0026] According to a preferred embodiment, the at least one first sheet metal section and the at least one second sheet metal section can be essentially in one

[0027] are arranged in the middle of an axial longitudinal extent of the sheet metal stack. P241384 DE01

[0028] - 5 -

[0029] By arranging at least one first sheet metal section and at least one second sheet metal section in the middle of the stator, the cooling fluid can be introduced centrally into the stator winding and spread axially outwards in both directions, thus advantageously achieving uniform cooling.

[0030] According to a preferred embodiment, the laminated core can have a further first sheet section with a first cooling section, wherein the first cooling channel section of the further first sheet section is fluidly connected to the second cooling channel section of the at least one second sheet section, so that the cooling fluid can flow from the first cooling section of the further first sheet section into the second cooling channel section of the at least one second sheet section.

[0031] The second lamination section is preferably arranged on the opposite side of the first lamination section, with the second lamination section positioned between them. This arrangement advantageously increases the flow rate of the coolant and thus the cooling effect. This has a positive impact on the efficiency of the stator. Furthermore, the cooling sections can be made smaller for the same flow rate, so that the properties of the laminated core for forming the magnetic field are less impaired.

[0032] According to a preferred embodiment, the laminated core can have a further second sheet section with a second cooling section, wherein the first cooling channel section of the at least one first sheet section is fluidly connected to the second cooling channel section of the further second sheet section, so that the cooling fluid can flow from the first cooling channel section of the at least one first sheet section into the second cooling channel section of the further second sheet section.

[0033] The second sheet metal section is preferably arranged next to the first sheet metal section, so that the first sheet metal section is positioned between the two second P241384 DE01

[0034] - 6 -

[0035] It is arranged in sheet metal sections. In this way, the distribution of the coolant at the inlet to the groove can be optimized.

[0036] According to a preferred embodiment, a first free space can be provided between a first side wall of the second groove of the at least second sheet metal section and the stator winding, which is fluidically connected to the opening of the second cooling channel section of the at least one second sheet metal section, or a first free space can be provided between a first side wall of the first groove of the at least first sheet metal section and the stator winding, which is fluidically connected to the opening of the first cooling channel section of the at least one first sheet metal section, wherein the first free space extends at least over a radial extension length of the stator winding so that the coolant can flow laterally into the stator winding, and / or a second free space can be provided between a second side wall of the second groove of the at least second sheet metal section and the stator winding.which is fluidically connected to the opening of the second cooling channel section of the at least one second sheet metal section, and / or a second free space exists between a second side wall of the first groove of the at least first sheet metal section and the stator winding, which is fluidically connected to the opening of the first cooling channel section of the at least one first sheet metal section, wherein the second free space can extend at least over a radial extension length of the stator winding, so that the coolant can flow laterally into the stator winding.

[0037] By creating spaces between one side wall of the slot and the stator winding located therein, it is advantageous to allow coolant circumferential access to stator windings located deeper in the slot. This allows the coolant to distribute more effectively, thus optimizing cooling and resulting in a more efficient stator. The space can be located on one or both sides of the stator winding's circumference, allowing for flexible design. P241384 DE01

[0038] - 7 -

[0039] According to a preferred embodiment, the first free space and / or the second free space can taper radially from the outside to the inside.

[0040] By narrowing the free space radially from the outside to the inside, an optimized flow rate can be set for each level of the stator winding. A larger flow rate is required in the radially outer region, as the upper level of the stator winding and the levels below it must be supplied with coolant. With increasing radial extension towards the inside, fewer levels of the stator winding need to be supplied with coolant. Furthermore, narrowing the free space advantageously reduces the negative impact of material removal on the laminated core and thus on the magnetic field formation.

[0041] According to a preferred embodiment, an insulating paper with at least one opening can be arranged in the groove between the laminated core and the stator winding, wherein the at least one opening of the insulating paper is fluidically connected to the opening of the second cooling channel section of the at least one second laminated core section or the opening of the first cooling channel section of the at least one first laminated core section, so that the cooling fluid can flow into the groove of the laminated core to cool the stator winding.

[0042] The insulating paper in this context refers to a paper that provides electrical insulation between the stator winding and the laminated core. This is particularly advantageous when mechanical stress damages the outer stator windings, thus preventing short circuits. The inclusion of an opening in the insulating paper allows the coolant to flow through it and cool the stator windings. This increases overall efficiency while simultaneously protecting against premature stator failure due to mechanical stress.

[0043] According to a preferred embodiment, the at least one opening of the insulating paper can be arranged on a radially outwardly directed side of the insulating paper, so that the cooling liquid enters the stator winding radially from the outside. P241384 DE01

[0044] - 8 - flows and / or at least one opening of the insulating paper is arranged on a circumferentially directed side of the insulating paper so that the cooling fluid can flow laterally into the stator winding.

[0045] With the opening arranged radially outwards, the coolant can advantageously penetrate the stator winding from the outside inwards via an end face. This is particularly advantageous if there are no free spaces in the slot. If the opening is arranged on the circumferential side of the insulating paper, the coolant can advantageously penetrate laterally into a plane of the stator winding. Preferably, several openings are then located on a circumferential side surface of the insulating paper. This, in combination with any existing free space, allows for an optimal volume flow rate for cooling.Furthermore, the size of the openings arranged radially from outside to inside in the circumferential direction can decrease, so that the lower required volume flow in a lower level of the stator winding can be taken into account while at the same time the insulation effect remains as high as possible.

[0046] According to a preferred embodiment, the at least one stator winding can comprise a wave winding or a hairpin winding; and / or the at least one stator winding can be sealed against a radially inner region of the stator and / or a supply channel is arranged in a housing of the stator, which is fluidically connected to a first cooling channel section of the at least one first sheet metal section, so that the cooling fluid can flow into the first cooling channel section of the at least one first sheet metal section.

[0047] Sealing the area below the stator winding (i.e., the slot opening) protects the rotor from the coolant. Furthermore, cooling can be improved by forcing the coolant to flow axially outwards through the stator winding. For a shaft winding, this sealing can be achieved using slot closure wedges. These can be tightly glued. For a hairpin winding, the slot openings can be sealed with adhesive P241384 DE01.

[0048] - 9 - be sealed. The supply channel can, for example, be implemented as a circumferential groove on the inside of the stator housing. The stator can, for example, be arranged in the stator housing via a cross-press fit, so that the supply channel is sealed against the environment. Alternatively, the supply channel can be sealed against the environment by two sealing rings arranged in two grooves in the housing. The supply channel can be fed with coolant from a reservoir or collection container by means of a pump. After the coolant has flowed through the stator winding in the axial direction, it can be collected in the reservoir.

[0049] In this way, an efficient cooling circuit can be enabled.

[0050] Another aspect of the present invention relates to an electric motor with a stator described in more detail above.

[0051] The invention is explained below with the aid of a drawing. The drawing shows...

[0052] Figure 1 shows a first view of a stator according to the invention of a first embodiment,

[0053] Figure 2 shows a second view of a stator according to the invention of a first embodiment,

[0054] Figure 3 shows a first sheet metal section of a first embodiment,

[0055] Figure 4 shows a second sheet metal section of a first embodiment,

[0056] Figure 5 shows a third sheet metal section of a first embodiment,

[0057] Figure 6 shows an insulating paper of a first embodiment,

[0058] Figure 7 shows a third view of a stator according to the invention of a first embodiment, P241384 DE01

[0059] - 10 -

[0060] Figure 8 shows a fourth view of a stator according to the invention of a first embodiment,

[0061] Figure 9 shows a second sheet metal section of a second embodiment,

[0062] Figure 10 shows an insulating paper of a second embodiment,

[0063] Figure 11 shows a stator of a third embodiment,

[0064] Figure 12 shows a first sheet metal section of a third embodiment

[0065] Figure 13 shows a second sheet metal section of a third embodiment

[0066] Figure 14 shows a stator of a fourth embodiment

[0067] Figure 15 shows a first sheet metal section of a fourth embodiment,

[0068] Figure 16 shows a second sheet metal section of a fourth embodiment,

[0069] Figure 17 shows a second sheet metal section of a fourth embodiment.

[0070] Identical elements are provided with the same reference numerals. Features of the individual embodiments can be interchanged, complement each other, or replace each other.

[0071] Figure 1 shows a stator 1 of a first embodiment. The stator 1 comprises a laminated core 2. The laminated core 2 is constructed from a plurality of laminated sections. A stator winding 3 is arranged in a slot 4 of the laminated core 2 within the stator 1. The stator winding 3 comprises several winding levels. In this case, the laminated core 2 comprises a first laminated section 5 with a first cooling channel section 6, and a second laminated section 7 with a second cooling channel section 8. The second cooling channel section 8 has an opening 9, which P241384 DE01

[0072] - 11 - is fluidically connected to a second groove of the second lamination section 7. The first cooling channel section 6 and the second cooling channel section 8 are fluidically connected to each other, so that a coolant can flow to and cool the stator winding 3. The first lamination section 5 and the second lamination section 7 are arranged in the middle of a longitudinal extension of the lamination stack 2. The stator 1 additionally has a further second lamination section 15 with a second cooling section 16.

[0073] Figure 2 shows a detailed second view of a stator 1 according to the invention, of a first embodiment. The further second sheet metal section 15 is arranged to the left of the first sheet metal section 5. The first cooling section 6 is fluidically connected to the second cooling section 16, so that the coolant can flow from the first cooling section 6 into the second cooling section 16 and from there into the slot 4 to cool the stator winding 3. It can also be seen that the first sheet metal section 5 has two inlets for the cooling sections 6. In this case, the cooling sections are distributed around the circumference of the stator and are located at each slot of the stator.

[0074] Figure 3 shows a first sheet metal section 5 of a first embodiment. The first sheet metal section 5 has a cooling channel section 6 distributed around its circumference at each first groove 11, which projects radially inwards to approximately 1 / 3 of its length. The coolant flows from the outside to the inside of the cooling channel section 6.

[0075] Figure 4 shows a second sheet metal section 7 of a first embodiment. The second sheet metal section 7 has a cooling channel section 8 distributed around its circumference at every second groove 12. The beginning of the cooling channel section 8 overlaps with the end of the cooling channel section 6, so that, in an assembled state, the coolant can flow from the cooling section 6 into the cooling section 8 and from there through opening 9 into the second groove 12.

[0076] Figure 5 shows a third sheet metal section 19 of a first embodiment. This sheet metal section does not have a cooling channel section. The sheet metal stack consists of P241384 DE01

[0077] - 12 -

[0078] Exception: the sheet metal sections located in the middle and equipped with cooling sections, made from sheet metal sections 19.

[0079] Figure 6 shows an insulating paper 30 of a first embodiment. The insulating paper 30 is arranged in the groove 2 between the laminated core 2 and the stator winding 3. The insulating paper has an opening 31 so that the coolant can flow into the stator winding 3.

[0080] Figure 7 shows a third view of a stator 1 according to the invention in a first embodiment. In contrast to Figure 1, the stator 1 has only a first sheet metal section 5 and a second sheet metal section 7.

[0081] Figure 8 shows a fourth view of a stator 1 according to the invention in a first embodiment. In contrast to Figure 7, the stator 1 has a further first sheet metal section 13 with a first cooling section 14, which is in fluidic contact with the second cooling section 8.

[0082] Figure 9 shows a second sheet metal section 7 of a second embodiment. Here, the second groove 12 has a first free space 18 between the first side wall 17 and the stator winding 3. Coolant can flow radially from the outside to the inside through the opening 9 in the first free space 18 and then penetrate laterally into the stator winding 3. Furthermore, the sheet metal section 7 has a second free space 27 between the second side wall 26 and the stator winding 3, through which coolant can also flow to cool the stator winding.

[0083] Figure 10 shows an insulating paper 30 of a second embodiment. In this embodiment, the insulating paper has a plurality of openings 31, which are distributed laterally in the circumferential direction and allow the cooling liquid to penetrate laterally into different planes of the stator winding 3.

[0084] Figure 11 shows a stator 1 of a third embodiment. In contrast to Figure 1, here the first sheet metal section 5 has a first multi-part cooling channel section 20. P241384 DE01

[0085] - 13 - with an opening 21, which is connected to a first groove 11. Furthermore, a second sheet metal section 40 with a corresponding centrally arranged second cooling channel section 41 are arranged next to it.

[0086] Figure 12 shows a first sheet metal section 23 of a third embodiment. The second cooling channel section 20 has two parts 20 that are separated from each other in the middle. It can also be seen that a first free space 24 exists between a first side wall 22 of the first groove 11 of the at least first sheet metal section 23 and the stator winding 3. This free space is fluidically connected to the opening 25 of the first cooling channel section 20 of the first sheet metal section 23. The first free space 24 tapers radially from the outside to the inside. A second free space 29 exists between the second side wall 28 of the first groove 11 of the first sheet metal section 23 and the stator winding 3. This second free space also tapers radially from the outside to the inside.

[0087] Figure 13 shows a second sheet metal section 40 of a third embodiment. The second sheet metal section 40 has a cooling channel section 41 located in the middle. The cooling channel section 41 is fluidically connected to both parts 20 of the first multi-part cooling channel section 20.

[0088] Figure 14 shows a stator 1 of a fourth embodiment. This has a first sheet metal section 5, a second sheet metal section 7 and a further sheet metal section 15.

[0089] Figure 15 shows a first sheet metal section 5 with a first cooling channel section 6 of a fourth embodiment.

[0090] Figure 16 shows a second sheet metal section 7 of a fourth embodiment. This section has a clearance 18 only on the first side 17 of the groove 12.

[0091] Figure 17 shows a further second sheet metal section 15 of a fourth embodiment. This section has a clearance 27 only on the second side 16 of the groove 12. P241384 DE01

[0092] - 14 -

[0093] Reference symbol list

[0094] 1 Stator

[0095] 2 sheet metal packages

[0096] 3 Stator winding

[0097] 4 groove

[0098] 5 first sheet metal section

[0099] 6 first cooling channel section

[0100] 7 second sheet metal section

[0101] 8 second cooling channel section

[0102] 9 Opening

[0103] 10 Inlet opening cooling channel section

[0104] 11 first groove

[0105] 12 second groove

[0106] 13 more first sheet metal sections

[0107] 14 first cooling channel section

[0108] 15 more second sheet metal sections

[0109] 16 second cooling section

[0110] 17 first side wall

[0111] 18 first free space

[0112] 19 third sheet metal section

[0113] 20 multi-part first cooling channel section

[0114] 21 Opening

[0115] 22 first side wall

[0116] 23 first sheet metal section

[0117] 24 first free space

[0118] 25 Opening

[0119] 26 second side wall

[0120] 27 second free space

[0121] 28 second side wall

[0122] 29 second free space

[0123] 30 sheets of insulating paper

[0124] 31 Opening P241384 DE01

[0125] - 15 -

[0126] 32 Opening

[0127] 40 second sheet metal section

[0128] 41 second cooling channel section

Claims

P241384 DE01 - 16 - Claims 1. Stator (1) for an electric motor with a laminated core (2) and with at least one stator winding (3), wherein the stator winding (3) is arranged within a slot (4) of the laminated core (2), characterized in that the laminated core (2) comprises at least a first laminated section (5) with at least a first cooling channel section (6) and a first slot (11) and at least a second laminated section (7) with at least a second cooling channel section (8) and a second slot (12), wherein the first cooling channel section (6) is fluidically connected to the second cooling channel section (8) so that a cooling fluid flows from the first cooling channel section (6) into the second cooling channel section (8);wherein the second cooling channel section (8) has an opening (9) which is fluidly connected to the second slot, so that the coolant flows into the slot (4) of the laminated core (2) for cooling the at least one stator winding (3) or wherein the first cooling channel section (20) is multi-part and has an opening (21) which is fluidly connected to the first slot (11), so that the coolant flows into the slot (4) of the laminated core (2) for cooling the at least one stator winding (3).

2. Stator (1 ) according to claim 1 , characterized in that the at least one first sheet metal section (5) and the at least one second sheet metal section (7) are arranged substantially in a center of an axial longitudinal extension of the sheet metal stack (2).

3. Stator (1 ) according to claim 1 or 2, characterized in that the laminated core (2) has a further first laminated section (13) with a first cooling section (14), P241384 DE01 - 17 - wherein the first cooling channel section (14) of the one further first sheet metal section (13) is fluidically connected to the second cooling channel section (8) of the at least one second sheet metal section (8), so that the coolant flows from the first cooling section (14) of the further first sheet metal section (13) into the second cooling channel section (8) of the at least one second sheet metal section (7).

4. Stator (1 ) according to claim 1 or 2, characterized in that the laminated core (2) has a further second laminated section (15) with a second cooling section (16), wherein the first cooling channel section (6) of the at least one first laminated section (5) is fluidically connected to the second cooling channel section (16) of the further second laminated section (15), so that the cooling fluid flows from the first cooling channel section (6) of the at least one first laminated section (5) into the second cooling channel section (16) of the further second laminated section (15).

5. Stator (1) according to one of the preceding claims, characterized in that a first free space (18) is provided between a first side wall (17) of the second groove (12) of the at least second sheet metal section (7) and the stator winding (3), which is fluidically connected to the opening (9) of the second cooling channel section (8) of the at least one second sheet metal section (7), or that a first free space (24) is provided between a first side wall (22) of the first groove (11) of the at least first sheet metal section (23) and the stator winding (3), which is fluidically connected to the opening (25) of the first cooling channel section (20) of the at least one first sheet metal section, wherein the first free space (24) extends at least over a radial extension length of the stator winding (3), so that the cooling fluid flows laterally into the stator winding (3),and / or between a second side wall (26) of the second groove of the at least second sheet metal section and the stator winding there is a second free space (27) which, P241384 DE01 - 18 - is fluidically connected to the opening (9) of the second cooling channel section of the at least one second sheet metal section, or a second free space (29) exists between a second side wall (28) of the first groove (11) of the at least first sheet metal section (23) and the stator winding (3), which is fluidically connected to the opening (25) of the first cooling channel section (20) of the at least one first sheet metal section (23), wherein the second free space (29) extends at least over a radial extension length of the stator winding (3), so that the cooling fluid flows laterally into the stator winding.

6. Stator (1 ) according to claim 5, characterized in that the first free space (24) and / or the second free space (29) tapers radially from the outside to the inside.

7. Stator (1 ) according to one of the preceding claims, characterized in that an insulating paper (30) with at least one opening (31 ) is arranged in the groove (4) between the laminated core (2) and the stator winding (3), wherein the at least one opening (31 ) of the insulating paper (30) is fluidically connected to the opening of the second cooling channel section of the at least one second laminated core section or the opening of the first cooling channel section of the at least one first laminated core section, so that the cooling fluid flows into the groove of the laminated core for cooling the stator winding.

8. Stator (1) according to claim 7, characterized in that the at least one opening (31) of the insulating paper (30) is arranged on a radially outwardly directed side of the insulating paper (30), so that the cooling fluid flows radially from the outside into the stator winding (3) and / or P241384 DE01 - 19 - that at least one opening (32) of the insulating paper (30) is arranged on a circumferentially directed side of the insulating paper (30) so that the cooling liquid flows laterally into the stator winding.

9. Stator (1 ) according to one of the preceding claims, characterized in that the at least one stator winding (3) comprises a wave winding or a hairpin winding; and / or wherein the at least one stator winding (3) is sealed against a radially inner region of the stator (1 ); and / or wherein a supply channel is arranged in a housing of the stator (1 ) which is fluidically connected to a first cooling channel section (6) of the at least one first sheet metal section (5), so that the cooling fluid flows into the first cooling channel section (6) of the at least one first sheet metal section (6).

10. Electric motor with a stator (1 ) according to one of claims 1 to 9.

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