EP3701620A1

EP3701620A1 - Cooling device for a stator of an electric machine of a motor vehicle, stator, and motor vehicle

Info

Publication number: EP3701620A1
Application number: EP18769315.5A
Authority: EP
Inventors: Jens Richter; Andreas Huber
Original assignee: Bayerische Motoren Werke AG
Current assignee: Bayerische Motoren Werke AG
Priority date: 2017-10-24
Filing date: 2018-09-06
Publication date: 2020-09-02
Also published as: WO2019081112A1; CN115995903A; US20200227965A1; DE102017218933A1; CN111052552A; US11646621B2

Abstract

The invention relates to a cooling device (9) for cooling a stator (1) for an electric machine of a motor vehicle, having a coolant-conducting unit (10) and at least one winding groove cooling channel (11). The coolant-conducting unit (10) and the at least one winding groove cooling channel (11) are designed as a structural unit and are designed to be connectable to a hollow-cylindrical lamination stack (2) of the stator (1) having, in a circumferential direction (U), a plurality of winding grooves (6) which extend axially and are designed to receive windings of the stator (1). The coolant-conducting unit (6) is designed for arrangement on an end face (7) of the lamination stack (2) and for conducting coolant along the end face (7), and has an inlet (12) for supplying the coolant and an outlet (14) for discharging the coolant, and the at least one winding groove cooling channel (11) extending axially from the coolant unit (11) is designed for arrangement in at least one winding groove (6) and for conducting the coolant in the at least one winding groove (6), and is fluid-coupled to the inlet (12) and the outlet (13).The invention also relates to a stator (1) for an electric machine and to a motor vehicle.

Description

Cooling device for a stator of an electrical machine of a motor vehicle, stator and motor vehicle

The invention relates to a cooling device for cooling a stator for an electrical machine of a motor vehicle. The invention also relates to a stator for an electrical machine of a motor vehicle and a motor vehicle.

In the present case, the interest is directed to electric machines for motor vehicles, in particular electric drive machines for electric or hybrid vehicles. These electric machines usually have a stator and a rotatably mounted rotor with respect to the stator. The stator has a laminated core, at the axial ends windings form a respective winding head. During operation of the electric machine, a power loss occurs in the form of heat, through which the electric machine heats up. This heating of the electric machine can adversely affect the performance of the electric machine. Overheating of the electric machine can even lead to failure of the electric machine.

For this purpose, it is known from the prior art to cool the stator of an electric machine in the region of the laminated core via a contact between the laminated core and a housing of the stator. For this purpose, the housing with its own

Cooling device to be equipped, which is very expensive to manufacture and also very expensive. If the cooling device is located on an inner side of the housing, so there is also the disadvantage that the housing is very bulky and space consuming. It is also known to provide a cooling medium for cooling the housing on an outer side of the housing. Cooling through the housing must be

Heat transfer resistance between laminated core and housing, which reduces the possible cooling effect, overcome and requires a good mechanical connection between the laminated core and the housing, for example by a

Press fit. A production of the interference fit between the laminated core and the housing requires low tolerances and a complex joining process. It is an object of the present invention to provide an efficient and easily realizable cooling for a stator of an electric machine of a motor vehicle.

This object is achieved by a cooling device, a stator and a motor vehicle with the features according to the respective independent

Claims solved. Advantageous embodiments of the invention are the subject of the dependent claims, the description and the figures.

A cooling device according to the invention for cooling a stator for an electric machine of a motor vehicle has a Kühlmittelleiteinheit and at least one Wicklungsnutkühlkanai, wherein the Kühlmittelleiteinheit and the at least one Wicklungsnutkühlkanai are formed as a structural unit. The Kühlmittelleiteinheit and the at least one Wicklungsnutkühlkanai are formed with a hollow cylindrical laminated core of the stator, which has in a circumferential direction a plurality of axially extending and formed for receiving windings winding grooves, plugged together. The Kühlmittelleiteinheit is designed for arranging on an end face of the laminated core and for conducting coolant along the end face and has an inlet for supplying the coolant and a drain for discharging the coolant. The at least one, starting from the

Coolant unit axially extending Wicklungsnutkühlkanai is designed for placement in at least one winding groove and for guiding the coolant in the at least one winding groove and is fluidly coupled to the inlet and the outlet.

The invention also relates to a stator for an electric machine

Motor vehicle with a hollow cylindrical laminated core, which in a

Circumferentially having a plurality of axially extending winding grooves, with windings, which are arranged in the winding grooves, and with a

Cooling device according to the invention, wherein the cooling device is plugged together with the laminated core. The at least one Wicklungsnutkühlkanai is arranged together with windings of the stator in at least one winding groove of the laminated core and the Kühlmittelleiteinheit is arranged on the front side of the laminated core.

The electric machine is in particular a drive machine for a motor vehicle in the form of an electric or hybrid vehicle. The electric machine has the stator, which comprises the hollow-cylindrical laminated core and electrical windings. Within the cylindrical inner area formed by the hollow cylindrical laminated core, a rotor can be rotatably mounted, wherein a rotation axis of the Rotor corresponds to a longitudinal axis of the hollow cylindrical Blechpaktes. In the radial direction, that is perpendicular to the axis of rotation, the rotor is enclosed or surrounded by the stator with the formation of an air gap. The laminated core has at one of the air gap facing the inside of the winding grooves for receiving the windings. In particular, the winding grooves are arranged in the circumferential direction equidistantly from each other and jet-shaped and extend in the axial direction from a first end face of the laminated core to a first end face opposite the second end face of the laminated core. In the axial direction, that is to say along the axis of rotation, the windings arranged in the winding slots can protrude beyond the laminated core on the end faces and form there a respective annular or annular winding head. The windings of the stator can, for example, as

Form bar windings or round wire windings be formed.

To cool the stator, the cooling device with the laminated core

be put together. In particular, the cooling device is for

Mating with the laminated core partially inserted or inserted into the laminated core. In this case, the cooling device is in particular prefabricated or preassembled to form the structural unit. This means that the

Kühlmittelleiteinheit and the at least one Wicklungsnutkühlkanal before the

Mating with the laminated core are already joined, so that the ready-to-use, especially sealed against an environment, structural unit or plug-in module results. The cooling device can thus be plugged as a whole in the laminated core and also be solved without damage again from the laminated core. The cooling device and the laminated core, in particular, can be plugged together accurately and thus form a plug-in system or modular system. The cooling device can be formed in one piece or in one piece. It can also be provided that the cooling device is designed in several parts, wherein the

Forming the structural unit, the coolant unit and the at least one

Wicklungsnutkühlkanal be joined together and connected, wherein joints or contact points are sealed, for example by gluing, pressing, sealing bodies or the like. Preferably, the Kühlmittelleiteinheit and the at least one Wicklungsnutkühlkanal are formed as injection molded parts. The

Coolant unit and the at least one Wicklungsnutkühlkanal can be made for example by means of an injection molding of a suitable plastic.

The Kühlmittelleiteinheit is particularly designed so that they are in

mated state of the cooling device with the laminated core at least partially overlapped with the front side of the laminated core. The Kühlmittelleiteinheit has the inlet, via which the cooling device, the coolant or cooling medium, such as water, can be supplied. In addition, the coolant unit has the outlet, via which the coolant can be removed again from the cooling device. The inlet and the outlet are arranged in the assembled state on the same end face or the same axial end of the laminated core. The coolant is thus in particular in a through the radial direction and the

Circumferentially spanned plane through the Kühlmittelleiteinheit along the

Headed side of the laminated core. The Kühlmittelleiteinheit, which is located in the region of the winding head of the stator, can also be cast together with the winding head or embedded in a potting compound, so that in addition by the Kühlmittelleiteinheit the winding head can be cooled.

The at least one Wickiungsnutkühlkanal extending from the coolant unit in the axial direction and is arranged in the assembled state of the cooling device with the laminated core together with windings of the stator within at least one winding groove. For example, the cooling device may have a number corresponding to the number of winding grooves

Windlungsnutkühlkanälen have. The at least one Wickiungsnutkühlkanal may extend over an entire height of the laminated core from the first end, on which, for example, the coolant unit is arranged to a first end face opposite the second end face of the laminated core. However, it can also be provided that the at least one Wickiungsnutkühlkanal extends only partially in the at least one winding groove or on the at least one

Wicklungsnut protrudes at the second end face.

The at least one Wickiungsnutkühlkanal is adapted to lead the coolant from the inlet of the Kühlmittelleiteinheit axially along a first flow direction from the first end side to the second end side of the laminated core and along a first flow direction opposite to the second flow direction to the drain back. In this case, the Wickiungsnutkühlkanal passes the coolant along those windings, which are arranged together with the Wickiungsnutkühlkanal in the respective winding groove. The at least one Wickiungsnutkühlkanal is formed completely enveloped along the axial direction. The

Wickiungsnutkühlkanal may for example be formed as a, in particular rectangular, tube. The coolant touches the at least winding groove and the

Windings of the winding groove, in which the at least one Wickiungsnutkühlkanal is arranged, that is not, but is completely guided within the at least one Wicklungsnutkühlkanals.

Characterized in that the cooling device is designed as a sealed, structural unit, it can be particularly easily mounted by mating with the laminated core to the stator. By passing cooling medium in the winding grooves of the

Laminations, the stator can be cooled in a reliable and efficient manner. The heat does not have to be dissipated to a cooled housing consuming. The stator can thus be formed, for example, housing-free.

Particularly preferably, the Kühlmittelleiteinheit has an annular cover member for arranging on the end face of the laminated core, wherein the inlet has at least one inlet nozzle and an annular inlet channel and the outlet has at least one outlet nozzle and an annular drain channel, and wherein the

Inlet channel and the drainage channel are fluidically separated by a partition wall of the Kühlmittelleiteinheit. The annular cover element has, for example, a radially inner inner wall and an outer radial direction

Outside wall on. The inner wall and the outer wall are thus arranged concentrically with one another. The cover element may also have an annular bottom, which in the assembled state of the cooling device faces the laminated core of the end face of the laminated core, and an annular cover which is axially opposite the base. The inlet channel and the outlet channel are in particular arranged concentrically to each other and by the example

annular, between the inner wall and the Au ßenwand arranged partition separated. For example, the inlet channel may be formed by the inner wall, the partition wall, the bottom and the cover. The drainage channel may be formed by the partition wall, the outer wall, the bottom and the cover. The inlet channel and the outlet channel are fluidically coupled to the at least one Wicklungsnutkühlkanal. The inlet channel is adapted to the coolant in the at least one

Initiate Wicklungsnutkühlkanal. The drainage channel is designed to remove the coolant from the at least one Wicklungsnutkühlkanal.

The at least one inlet nozzle, via which the coolant is introduced into the inlet channel, and the trim at least one outlet, via which the coolant from the drainage channel can be removed, are in particular in the cover of

Cover element arranged. The inlet nozzle is fluidically coupled to the inlet channel, the outlet nozzle is fluidly coupled to the drainage channel. In the ground For example, openings may be arranged adjacent to which

Wicklungsnutkühlkanäle are arranged and via which the coolant can be passed into or out of the corresponding Wicklungsnutkühlkanal. The

Wicklungsnutkühlkanäle can be arranged completely circumferentially in the circumferential direction of the annular cover element, so that the Wicklungsnutkühlkanäle form a cylindrical cage structure.

It proves to be advantageous if the at least one Wicklungsnutkühlkanal having an axially extending and fluidically coupled to the inlet Hinlaufkanalbereich for guiding the coolant in a winding groove and an axially extending and fluidically coupled to the drain return channel region for conducting the coolant from a Wicklungsnut , wherein the Hinlaufkanalbereich and the

Return channel area are fluidically coupled via a deflecting element. Everyone

Wicklungsnutkühlkanal thus has the two channel regions, which extend in particular parallel to each other and in the axial direction. The Hinlaufkanalbereich passes the coolant from the inlet of the Kühlmittelleiteinheit axially in the first flow direction through the winding groove in which the Hinlaufkanalbereich in

assembled state of the cooling device is arranged with the laminated core. The return channel region directs the coolant in the second flow direction axially through the winding groove, in which the return channel region in

assembled state of the cooling device is arranged with the laminated core. In order to change the flow direction of the coolant or to guide the coolant from the Hinlaufkanalbereich in the return passage region, the deflection element is fluidly coupled to the channel regions. The deflecting element may for example be U-shaped and be arranged adjacent to axial ends of the channel regions.

According to a first embodiment of the invention, the Hinlaufkanalbereich and the return channel region of the at least one Wicklungsnutkühlkanals are arranged together in a winding groove of the laminated core, so that the Wicklungsnutkühlkanal is adapted to direct the cooling medium in the same Wicklungsnut from the inlet back to the drain. In other words, the Hinlaufkanalbereich and the

Return channel region of the at least one Wicklungsnutkühlkanals formed or arranged to each other, that they can be arranged together in a winding groove of the laminated core. In the assembled state of the cooling device with the laminated core, the return channel region and the Hinlaufkanalbereich are thus arranged together in a winding groove of the laminated core. The cooling medium is So in the same Wicklungsnut back and forth, so from the inlet of the

Kühlmittelleiteinheit passed back into the drain of Kühlmittelleiteinheit. In particular, the cooling device in this case has a number corresponding to the number of Wicklungsnuten number of Wicklungsnutkühlkanälen, ie in each case one with the number of winding grooves corresponding number of return channel areas and

Hinlaufkanalbereichen on. It is thus in particular for each winding groove

Wicklungsnutkühlkanal provided. In particular, channel areas of a

Wicklungsnutkühlkanals in the radial direction one behind the other in the associated

Winding arranged. By way of example, one of the channel regions, for example the trace channel region, is arranged in the radial direction on the inside, that is to say in an area of the winding groove facing the air gap. The other channel region, for example, the return kanaibereich, can in a rear wall of the

Wicklungsnut facing region of the winding groove between the Hinlaufkanalbereich and the rear wall of the Wicklungsnut be arranged. The rear wall of the winding groove forms in the radial direction the transition between the winding groove and the

Laminated core. Because both the Hinlaufkanalbereich and the

Return kanaibereich are arranged in a Wicklungsnut, the laminated core and thus the stator can be efficiently cooled.

It can be provided that the Hinlaufkanalbereich and the return channel area are formed adjacent to each other. For example, anyone can

Wicklungsnutkühlkanal be integrally formed and have the Hinlaufkanalbereich, the return kanaibereich and the deflection. This can be the

Wicklungsnutkühlkanal be formed for example as a rectangular tube, in which, starting from the coolant unit, a partition wall in the axial direction, but not over the entire length of the Wicklungsnutkühlkanals extends. A gap formed thereby between the Hinlaufkanalbereich and the

Return kanaibereich thus forms the deflection. The Wicklungsnutkühlkanal may be arranged for example in the radially inner, the air gap facing region of the winding groove. In a region of the winding groove, which lies in the radial direction behind the region with the Wicklungsnutkühlkanal, the winding groove of the laminated core may be filled with windings. Also, the

Wicklungsnutkühlkanal be disposed adjacent to the rear wall of the winding groove. In the lying in the radial direction in front of the winding groove cooling channel, the air gap zugwendten area of the winding groove, the windings may be arranged.

Alternatively or additionally, the Wicklungsnutkühlkanal in a region between the rear wall of the Wicklungsnut facing region and the air gap be arranged facing area. In the radial direction in front of and behind the

Wicklungsnutkühlkanal then the windings can be arranged. The windings are thus separated or separated from each other by the Wicklungsnutkühlkanal.

It can also be provided that the Hinlaufkanaibereich and the return channel region are formed radially spaced to form an intermediate region to each other, wherein in the intermediate region windings of the stator can be arranged in the winding groove. For example, the Hinlaufkanaibereich be arranged in the air gap facing region of the winding groove. Adjacent to the

Hinlaufkanaibereich can be arranged windings and adjacent to the

Windings, the return channel region may be arranged in the region of the winding groove facing the rear wall of the winding groove. Thus, the windings in the radial direction are surrounded on both sides by the channel regions, so that the stator can be cooled particularly reliably by conducting the coolant on both sides along the windings.

Preferably, the baffle between the Hinlaufkanaibereich and the radially spaced return channel area of the Hinlaufkanaibereich and

Return channel region formed projecting in the circumferential direction and can be arranged overlapping with an adjacent to the at least one winding groove stator tooth. Here the Hinlaufkanaibereich and the return channel area extend in

assembled state of the cooling device with the laminated core, in particular over the entire height of the laminated core from the first end face, on which the Kühlmittelleiteinheit is arranged, to the second end face. The

Wicklungsnutkühlkanal may for example be integrally formed as a U-shaped bent tube. The deflection element, which is formed, for example, by the bent region of the winding groove cooling channel, is arranged in particular on the second end face of the laminated core and overlaps with the stator tooth located on the second end face. A stator tooth is formed by a region of the laminated core between two adjacent winding in the circumferential direction. For example, after mating the cooling device with the

Laminated core on the second end face projecting deflection of the

Windungsnutkühlkanals be bent or folded over in the direction of the stator tooth. This embodiment is based on the finding that the winding heads protrude beyond the second end face from the winding grooves. The deflecting element is advantageously arranged in a particularly space-saving manner between the winding heads. This also gives the advantage that the winding heads, to which can form particularly hot spots, so-called "hotspots" can be reliably cooled.

According to a second embodiment of the invention, the Hinlaufkanalbereich and the return passage area of the at least one Wicklungsnutkühlkanals in

Circumferentially arranged spaced from each other, wherein the Hinlaufkanalbereich can be arranged in a first winding groove and the return channel region can be arranged in a second winding groove adjacent to the first winding groove. According to this embodiment can thus in the direction of rotation in the assembled state of the cooling device with the laminated core alternately Hinlauf channel areas and

Return channel areas be arranged in the winding grooves, wherein a

Hinlaufkanalbereich a first winding groove and a return channel region of a second winding groove adjacent thereto form a Wicklungsnutkühlkanal. The cooling device thus has, in particular, half as many winding groove cooling channels as winding grooves. The cooling medium is conducted from the inlet of the Kühlmittelleiteinheit here in the Hinlaufkanalbereich the first Wicklungsnut and on the

Return channel region of the second Wicklungsnut back to the expiration of

Conducted coolant unit. From the arrangement of only one channel region in a winding groove, there is the advantage that the individual channel regions can be formed with a larger diameter, resulting in a larger

Cross section for the channel region flowing through the cooling medium.

It can be provided that the cooling device comprises a deflecting device with the at least one deflecting element, wherein the deflecting device is designed for arranging on one of the front side of the laminated core with the Kühlmittelleiteinheit opposite end face of the laminated core and with the at least one

Wicklungsnutkühlkanal is formed plugged together. The deflection device can be designed, for example, as an annular cover element which can be arranged on the second end face of the laminated core. For example, first the structural unit with the Kühlmittelleiteinheit and the at least one Wicklungsnutkühlkanal be inserted from a first direction in the laminated core, so that the channel areas are inserted into the respective winding grooves and the Kühlmittelleiteinheit is arranged on the first end side of the laminated core. Then, the deflection of one of the first direction opposite second

Direction to the second end face are placed so that two adjacent

Channel regions via a deflecting element of the deflection fluidly coupled become. The deflection device has in particular one to the number

Wicklungsnutkühlkanälen corresponding number of deflecting elements.

In a stator according to the invention, which comprises the cooling device according to the invention, it is preferably provided that a region of the winding groove, in which the at least one Wicklungsnutkühlkanal is arranged, compared to a

Area in which windings of the stator are arranged, widened in the circumferential direction. For example, the winding grooves may be widened so as to be parallel in the region in which the winding groove cooling channel is arranged

Have Wicklungsnutflanken. The Wicklungsnutflanken form a transition between a Wicklungsnut and the laminated core in the direction of rotation. A winding groove is thus formed in particular by two opposite Wicklungsnutflanken and the rear wall. The region of the winding grooves can also be widened in such a way that the stator tooth adjoining the region of the winding grooves has a parallel edge. Furthermore, it can be provided that the winding groove for receiving the at least one Wicklungsnutkühlkanals in the radial direction relative to a winding groove of a conventional, known in the prior art stator is formed extended. Depending on the arrangement of the at least one

Wicklungsnutkühlkanals in the at least one winding groove can then

Windings are shifted within the winding grooves.

A motor vehicle according to the invention comprises an electric machine with a stator according to the invention. The motor vehicle is designed in particular as an electric vehicle or a hybrid vehicle, which comprises the electric machine for driving the motor vehicle.

The presented with respect to the cooling device according to the invention

Embodiments and their advantages apply correspondingly to the stator according to the invention and to the motor vehicle according to the invention.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination, but also in others

Combinations or used alone. The invention will now be explained in more detail with reference to a preferred embodiment and with reference to the drawings. Show it:

Fig. 1 is a schematic exploded view of an embodiment of the invention stator with an embodiment of the cooling device according to the invention;

2 the stator according to FIG. 1 in the assembled state, FIG.

3a to 3d show a plan view of the stator with a first embodiment of the

Embodiment of the cooling device according to FIG. 1 and FIG. 2;

Fig. 4 is a schematic exploded view of another

Embodiment of the invention stator with a further embodiment of the cooling device according to the invention;

Fig. 5, the stator of FIG. 4 in the assembled state, and

6a to 6c show a plan view of the stator with a first embodiment of FIG

Embodiment of the cooling device according to FIG. 4 and FIG. 5.

In the figures are the same as well as functionally identical elements with the same

Provided with reference numerals.

Fig. 1 and Fig. 2 show components of a stator 1 for an electric machine of a motor vehicle, not shown here. The electric machine can be, for example, an electric drive motor for a motor vehicle designed as an electric vehicle or hybrid vehicle. The stator 1 has a hollow-cylindrical laminated core 2 which revolves around a longitudinal axis L of the stator 1 along a circumferential direction U. The longitudinal axis L also corresponds to an axis of rotation about which rotates a mounted inside the stator 1, not shown here rotor. The laminated core 2 has an inner side 4, which is formed adjacent to an air gap 3 between the rotor and the stator 2. For putting in, the laminated core 2 on one of the inside 4 in the radial direction R opposite outside 5 on. In addition, a plurality of Wicklungsnuten 6 is formed in the inner side 4 of the laminated core 2, which are arranged radially in the circumferential direction U. The winding grooves 6 extend axially along the longitudinal axis L from a first end face 7 of the laminated core 2 to one of the first end face 7 axially opposite the second end face 8 of

Sheet metal packages 2. In this winding grooves 6 not shown windings of the stator 1 are arranged here. The windings form on the end faces 7, 8 respective

Winding heads off.

In addition, the stator 1 has a cooling device 9, of which in FIGS. 1 and 2 a first embodiment is shown. The cooling device 9 has a

Kühlmittelleiteinheit 10 and at least one Wicklungsnutkühlkanal 1 1, here a plurality of axially extending Wicklungsnutkühlkanälen 1 1, on. The

Kühlmittelleiteinheit 10 and the Wicklungsnutkühlkanäle 1 1 form a structural unit. Thereby, the cooling device 9 as a whole along an insertion direction E (see exploded view of the stator 1 of FIG. 1) at least partially inserted or inserted into the laminated core 2. The cooling device 9 and the

Sheet metal package 2 can therefore be put together. In Fig. 2, the cooling device 9 and the laminated core 2 are shown in the assembled state. in the

mated state of the cooling device 9 and the laminated core 2, a Wicklungsnutkühlkanal 1 1 is arranged in a winding groove 6 respectively. A number of Wicklungsnutkühlkanälen 1 1 thus corresponds to a number of Wicklungsnuten 6. The Kühlmittelleiteinheit 10 is arranged in the assembled state of the cooling device 9 and the laminated core 2 at the first end face 7 of the laminated core 2 and overlaps at least partially with the first end face. 7

The Kühlmittelleiteinheit 10 here has an inlet 12 with at least one inlet nozzle 13 for supplying coolant and a drain 14 with at least one outlet nozzle 15 for discharging coolant. The inlet nozzle 13 and the outlet nozzle 15 are arranged here in an annular cover 16 of an annular cover element 17 of the Kühlmittelleiteinheit 10. Through the cover 16, an annular inner wall 18, an annular outer wall 19 and a bottom 20 of the cover member 17, an interior of the cover member 17 is enclosed, which one with the

Inlet nozzle 13 fluidly connected, annular inlet channel and a fluidically connected to the discharge nozzle 15, annular drain channel may include. The inlet channel and the outlet channel are in particular separated by a partition wall and concentric with each other, ie in the radial direction R adjacent to each other,

arranged. The Wicklungsnutkühlkanäle 1 1 are fluidly coupled to the inlet channel and the flow channel. For this purpose, 20 openings may be provided in the bottom, via which coolant from the inlet channel in the respective Wicklungsnutkühlkanal 1 1 or from the respective Wicklungsnutkühlkanal 1 1 can be passed into the drain channel. The Wickiungsnutkühlkanäie 1 1 can thus for cooling the stator 1, the coolant through the winding grooves 6 and along the windings arranged in the winding 6 lead.

Various embodiments of the cooling device 9 according to FIGS. 1 and 2 are shown in FIGS. 3 a to 3d. For this purpose, a cross-section through the laminated core 2 is shown on the left-hand side in FIGS. 3 a to 3d, and an enlarged illustration of a section of the cross-section with three adjacent winding grooves 6 is shown on the right-hand side. According to Fig. 3a to 3d in a Wicklungsnut 6 each Wicklungsnutkühlkanal 1 1 is arranged, which has a Hinlaufkanalbereich 21 and a return channel region 22. The Hinlaufkanalbereich 21 is fluidly coupled to the inlet 12 and the

Return channel region 22 is fluidically coupled to the drain 14. For putting in the Hinlaufkanalbereich 21 and the return passage area 22 are fluidly coupled via a deflecting element, not shown here. The deflecting element may be located, for example, on the second end face 8 of the laminated core 2. The coolant is thus passed from the Kühlmittelleiteinheit 10 through the Hinlaufkanalbereich 21 in a winding groove 6 and the return channel region 22 in the same Wicklungsnut 6 to the

Kühlmittelleiteinheit 10 fed back.

The Hinlaufkanalbereich 21 and the return channel region 22 are arranged here in the radial direction R one behind the other. According to the embodiments of the cooling device 9 according to FIGS. 3a, 3b, 3c, the trace channel region 21 and the return channel region 22 are formed adjacent to one another. For this purpose, the Wicklungsnutkühlkanal 1 1

For example, have an axially extending partition wall 23 through which a

Interior of Wicklungsnutkühlkanals 1 1 in two parallel, the

Channel areas 21, 22 forming subspaces is shared. According to FIG. 3d, the trace channel region 21 and the return channel region 22 are spaced from one another in the radial direction R.

According to FIG. 3 a, the winding groove cooling channels 1 1 are each arranged in a first region 24 of the winding grooves 6 adjoining the air gap 3. In a here adjacent to the first region 24 second region 25, which at the back to a

Rear wall 26 of the winding groove 6 adjacent, the windings of the stator 1 can be arranged. The windings are thus in the radial direction R behind the

Wicklungsnutkühlkanälen 1 1 arranged. According to Fig. 3b are the

Wickiungsnutkühlkanäie 1 1 arranged in the second region 25, wherein the windings are arranged in the first, adjacent to the air gap 3 region 24 of the winding grooves 6. The windings are thus in the radial direction R before the

Wicklungsnutkühlkanälen 1 1 arranged. According to Fig. 3c are the

Wicklungsnutkühikanäle 1 1 arranged centrally in the winding grooves 6 in a lying between the first region 24 and the second region 25 third region 27. In the first and the second region 24, 25, the windings are then arranged. The windings are thus arranged in the radial direction R in front of and behind the Wicklungsnutkühlkanälen 1 1 and are separated by the Wicklungsnutkühikanäle 1 1. In Fig. 3d is one of the channel areas, here the Hinlaufkanalbereich 21, in the first region 24 of the winding groove 6, and the other channel region, here the return channel region 22, in the second region 25 of the winding groove 6 is arranged. Between the Hinlaufkanalbereich

21 and the return channel region 22, the windings are arranged in the third region 27. According to FIG. 3d, the deflecting element can be bent over at the second end face 8 of the laminated core 2 and, for example, via one to the respective one

Wicklungsnut 6 adjacent stator tooth 28 run.

FIGS. 4 and 5 show the laminated core 2 and a second embodiment of a cooling device 9 of the stator 1. In the cooling device 9 according to FIG. 4 and FIG. 5, a Wicklungsnutkühlkanal 1 1 through a Hinlaufkanalbereich 21 and a in

Circulation direction U spaced apart arranged, adjacent return channel area

22 formed. The Hinlaufkanalbereich 21 a Wicklungsnutkühlkanals 1 1 is arranged in a Wicklungsnut 6 and the return channel region 22 thereof

Wicklungsnutkühlkanals 1 1 arranged in an adjacent winding groove 6. A Wicklungsnutkühlkanal 1 1 is thus divided into two adjacent Wicklungsnuten 6. For deflecting the coolant or for conducting the coolant of the

Hinlaufkanalbereich 21 in the one winding groove 6 in the return channel region 22 of the adjacent winding groove 6, a deflection device 29 is provided which comprises the deflection elements 30. The deflection 29 points for each

Wicklungsnutkühlkanal 1 1, a deflecting element 30 on. The deflection device 29 is designed here as an annular cover, which in one of the insertion direction e

opposite Anfügerichtung A on the second end face 8 of the laminated core 2 is arranged. The deflection 29 is connected to the structural unit

put together and coupled with the Wicklungsnutkühlkanälen 1 1.

FIGS. 6a to 6c show various embodiments of the cooling device 9 according to FIGS. 4 and 5. For this purpose, a cross section through the laminated core 2 and on the right side an enlarged view of a detail in Fig. 6a to Fig. 6c each left side of the cross section with three adjacent winding grooves 6 shown. According to Fig. 6a are arranged alternately in the winding grooves 6 Hin channel sections 21 and return channel regions 22 each disposed in the adjacent to the air gap 3 first region 24 of the winding grooves 6. In the second region 25, the windings of the stator 1 can be arranged. The windings are thus arranged in the radial direction R behind the trace channel regions 21 and return channel regions 22. According to FIG. 6b, the trace channel regions 21 and return channel regions 22 are arranged in the second region 25, wherein the windings are arranged in the first region 24 adjoining the air gap 3. The windings are thus arranged in the radial direction R before the Hinlaufkanalbereichen 21 and return channel areas 22. According to FIG. 6 c, the trace channel regions 21 and return channel regions 22 are arranged centrally in the winding grooves 6 in the third region 27 lying between the first region 24 and the second region 25. In the first and the second region 24, 25, the windings are then arranged. The windings are thus in the radial direction R before and behind the Hin channel sections 21 and return channel areas 22nd

arranged and channel areas 21 and return channel areas 22 separated by the Hinlauf.

It can be provided that the regions of the winding groove 6, in which the

Wicklungsnutkühlkanäle 1 1 are arranged opposite the regions of the winding groove 6, in which the windings are arranged widened. These can be the

Regions with the Wicklungsnutkühlkanälen 1 1, for example, be widened so that result in parallel groove edges. Also, the areas with the

Wicklungsnutkühlkanälen 1 1, for example, be widened so that result in parallel Statorzahnflanken. In addition, it can be provided that the

Winding grooves 6 of the stator 1 with respect to a conventional stator, in the winding grooves only windings are arranged in the radial direction R are extended.

LIST OF REFERENCE NUMBERS

stator

laminated core

air gap

inside

outside

winding groove

first end face second end face

cooler

0 Coolant unit

1 1 winding groove cooling channel

12 inlet

13 inlet nozzles

14 process

15 drain pipe

16 cover

17 cover element

18 inner wall

19 outer wall

0 ground

1 trace channel area

22 return channel area

23 partition wall

24 first area

25 second area

26 rear wall

27 third area

28 stator tooth

29 deflecting device

30 deflecting element

L longitudinal axis

U circulation direction

R radial direction E Insertion direction A Attachment direction

Claims

claims

1 . Cooling device (9) for cooling a stator (1) for an electrical machine of a motor vehicle having a Kühimitteileiteinheit (10) and at least one Wicklungsnutkühlkanal (1 1), wherein the Kühimitteileiteinheit (10) and the at least one Wicklungsnutkühlkanal (1 1) as a structural Unit are formed and with a hollow cylindrical laminated core (2) of the stator (1), which in a circumferential direction (U) a plurality of axially extending and for receiving windings of the stator (1) formed Wicklungsnuten (6), are formed zusammensteckbar , and where

- The Kühimitteileiteinheit (6) for arranging on an end face (7) of the laminated core (2) and for conducting coolant along the end face (7) is formed and an inlet (12) for supplying the coolant and a drain (14) for discharging of the coolant, and

- The at least one, starting from the coolant unit (1 1) axially extending Wicklungsnutkühlkanal (1 1) for arranging in at least one winding groove (6) and for conducting the coolant in the at least one

Winding groove (6) is formed and is fluidically coupled to the inlet (12) and the outlet (13).

2. Cooling device (9) according to claim 1,

characterized in that

the Kühimitteileiteinheit (10) and the at least one Wicklungsnutkühlkanal (1 1) are formed as injection molded parts.

3. Cooling device (9) according to claim 1 or 2,

characterized in that

the Kühimitteileiteinheit (1 1) comprises an annular cover member (17) for arranging on the end face (7) of the laminated core (2), wherein the inlet (12) has at least one inlet port (13) and an annular inlet channel and the Drain (14) has at least one outlet nozzle (15) and an annular drain channel, and wherein the inlet channel and the outlet channel are separated by a partition wall.

4. Cooling device (9) according to one of the preceding claims,

characterized in that

the at least one Wicklungsnutkühlkanal (1 1) has an axially extending and fluidically coupled to the inlet (12) Hinlaufkanalbereich (21) for conducting the coolant in a winding groove (6) and an axially extending and with the outlet (14) fluidly coupled return line Channel region (22) for conducting the coolant from a winding groove (6), wherein the Hinlaufkanalbereich (21) and the return channel region (22) via a deflecting element (30) are fluidly coupled.

5. Cooling device (9) according to claim 4,

characterized in that

the Hinlaufkanalbereich (21) and the return channel region (22) of the at least one Wicklungsnutkühlkanals (1 1) together in a winding groove (6) of the laminated core (2) can be arranged, so that at least one

Wicklungsnutkühlkanal (1 1) is adapted to guide the cooling medium in the same winding groove (6) from the inlet (12) back to the outlet (14).

6. Cooling device (9) according to claim 5,

characterized in that

the Hinlaufkanalbereich (21) and the return channel region (22) are formed adjacent to each other.

7. Cooling device (9) according to claim 5,

characterized in that

the Hinlaufkanalbereich (21) and the return channel region (23) are formed radially spaced to form an intermediate region to each other, wherein in the intermediate region, a winding of the stator (1) in the winding groove (6) can be arranged.

8. Cooling device (9) according to claim 7,

characterized in that

the deflecting element (30) between the Hinlaufkanalbereich (21) and the radially spaced return channel region (22) in the direction of rotation (U) of the

Hinlaufkanalbereich (21) and the return channel area (22) protruding

is formed and overlapping with a to the at least one winding groove (6) adjacent stator tooth (28) can be arranged.

9. Cooling device (9) according to claim 4,

characterized in that

the Hinlaufkanalbereich (21) and the return channel region (22) of the at least one Wicklungsnutkühlkanals (6) in the circumferential direction (U) are arranged spaced from each other, wherein the Hinlaufkanalbereich (21) in a first winding groove (6) can be arranged and the return channel region (22 ) can be arranged in a second winding groove (6) adjacent to the first winding groove (6).

10. Cooling device (9) according to claim 9,

characterized in that

the cooling device (9) has a deflection device (29) with the at least one deflecting element (30), wherein the deflecting device (29) for arranging on one end face (8 ) of the laminated core (2) is formed and with the at least one Wicklungsnutkühlkanal (1 1) is formed plugged together.

1 1. Stator (1) for an electrical machine of a motor vehicle with a

hollow cylindrical laminated core (2) having in a circumferential direction (U) a plurality of axially extending Wicklungsnuten (6), with windings, which are arranged in the winding grooves (6), and with a cooling device (9) according to one of the preceding claims , wherein the cooling device (9) with the laminated core (2) is plugged together, the at least one

Wicklungsnutkühlkanal (1 1) together with windings of the stator (1) in at least one winding groove (6) of the laminated core (2) is arranged and the Kühlmittelleiteinheit (10) on the end face (7) of the laminated core (2) is arranged.

12. Stator (1) according to claim 1 1,

characterized in that

a region of the winding groove (6) in which the at least one

Wicklungsnutkühlkanal (1 1) is arranged, in comparison to a region in which a winding of the stator (1) is arranged in the circumferential direction (U) is widened.

13. A motor vehicle having an electric machine comprising a stator (1) according to claim 11 or 12.