Face stator lamination for stator body of electric machine stator

Abstract

The invention relates to an end-face stator lamination for a stator body of an electric machine stator, said end-face stator lamination being designed to be arranged on a flat end face of the stator body. The end-face stator laminations have one or more nozzle recesses, which are each designed to form one or more corresponding cavities for receiving a coolant together with the flat end face of the stator body. Furthermore, the end-face stator lamination has a respective hole on each of the one or more nozzle recesses, said hole being designed to form a coolant jet with the coolant from the respective cavity.

Description

Technical Field

[0001] The present invention relates to an electric machine, such as a synchronous machine, and in particular to the cooling of the winding heads of the stator of the electric machine. Background Art

[0002] An at least partially electrically driven vehicle comprises an electric motor for driving the vehicle. The electric motor comprises a stator, which surrounds a rotor of the electric motor. Furthermore, the electric motor usually has a coolant circuit in order to cool the electric motor, in particular the electric windings of the stator. The coolant can be guided in hollow coolant channels in the stator body of the stator. Furthermore, the coolant can be sprayed onto the winding heads on the end faces of the stator body by means of a nozzle. However, a sufficiently strong coolant jet may not be formed by the nozzle, which affects the cooling efficiency of the winding heads. Furthermore, the coolant may enter the air gap between the stator and the rotor on the end faces of the stator body, thereby affecting the efficiency of the electric motor. Summary of the invention

[0003] The present invention is directed to the technical task of increasing the efficiency and targeted accuracy of cooling of the winding heads on the end faces of the stator body of the stator.

[0004] This task is solved by an independent claim. In addition, advantageous embodiments are described in the dependent claims. It should be noted that the additional features of the dependent claims of the independent claim can constitute an independent invention independent of the combination of all features of the independent claim without the features of the independent claim or in combination with only part of the features of the independent claim, which can be the technical solution of the independent claim, a divisional application or a subsequent application. The same applies to the technical teachings described in the specification, which can form an invention independent of the features of the independent claim.

[0005] According to one aspect, a stator body for a stator of an electric machine is described. The stator body is configured to be arranged on a flat end face of the stator body. The stator body can, for example, have a base body having a plurality of flat stator laminations. Here, the base body can extend from a first outer (flat) end face to an opposite second outer (flat) end face. The stator body can be configured to be arranged (in particular fixed) on a first outer end face or a second outer end face of the base body to form the stator body. In this case, the stator body can have a lamination stack having (or consisting of) a plurality of flat stator laminations of the base body and one or two stator laminations of the end face.

[0006] The end face stator lamination has one or more nozzle recesses, which are respectively configured to form one or more corresponding cavities for accommodating coolant (especially oil) together with the flat end face of the stator body (when the end face stator lamination is arranged on the flat end face of the stator body). The one or more nozzle recesses can be manufactured from flat laminations, especially from flat stator laminations, in an efficient manner by a lamination forming process, especially by a deep drawing process. In a preferred example, the stator laminations for the base body can be formed to form the end face stator laminations with the one or more nozzle recesses. Therefore, the end face stator laminations can be manufactured in a particularly efficient manner. Each nozzle recess can have a pit and / or a concave (circular) shape.

[0007] The end stator lamination preferably has a plurality of nozzle recesses, which are arranged around the longitudinal axis (extending centrally) of the stator body in a circumferential direction, especially evenly distributed. The stator body may have, for example, N stator slots (for example, N=8 or more, or N=16 or more). If necessary, the end stator lamination may have a corresponding number of N nozzle recesses or less than N nozzle recesses. For example, the end stator lamination may have 4 or more, or 8 or more nozzle recesses. By providing an evenly distributed arrangement of a plurality of nozzle recesses, particularly reliable cooling of the stator winding head arranged on the end stator lamination can be achieved.

[0008] The end stator lamination has (at least or exactly) one hole on each of the one or more nozzle recesses, which is configured to form a coolant jet with the coolant from the corresponding cavity. The holes of the individual nozzle recesses can therefore have the function of nozzle openings in order to form a coolant jet.

[0009] The holes of the individual nozzle recesses can each be oriented toward a longitudinal axis extending centrally of the stator body, i.e. toward the axis of rotation of the rotor. The position and / or orientation of the holes in different nozzle recesses of the plurality of nozzle recesses can be different if necessary. The individual holes can thus be used to direct the correspondingly induced coolant jets in an optimal manner toward the winding heads to be cooled. This makes it possible to achieve particularly efficient and reliable cooling of the winding heads.

[0010] The stator can therefore have a winding head on a flat end face of the stator body provided with the end-face stator laminations, which protrudes beyond the flat end face of the stator body in the axial direction. The holes of the one or more nozzle recesses can each be designed to cause a coolant jet to be directed toward the winding head (when the end-face stator laminations are provided on the flat end face of the stator body). As a result, a particularly efficient and reliable cooling of the winding head can be achieved.

[0011] Thus, a stator lamination produced by lamination forming for arrangement on an end face of a stator body is described. The end face stator lamination has one or more nozzle recesses, each with a nozzle opening, wherein the nozzle is formed in an efficient manner by the one or more nozzle recesses in order to form a reliable coolant jet for cooling the stator winding head.

[0012] The stator body can have at least one (usually a plurality of) axial coolant channels extending in the axial direction. The cooling channels can be arranged, for example, in the stator yoke and / or in the stator teeth of the stator body. If necessary, the stator body can have at least or exactly one coolant channel for each stator tooth and / or in each stator tooth.

[0013] The end face stator laminations may have one or more channel recesses which are respectively configured to form one or more corresponding end face coolant channels together with the flat end face of the stator body between the axial coolant channel and the at least one nozzle recess (when the end face stator laminations are arranged on the flat end face of the stator body).

[0014] The end face stator laminations can therefore have one or more additional (channel-like) recesses to form one or more corresponding coolant channels extending along the flat end face perpendicularly to the longitudinal axis of the stator body. These end face coolant channels guide the coolant from the one or more axial coolant channels into the respective nozzle recesses and thus ensure efficient and reliable supply of coolant to the nozzles formed by the nozzle recesses.

[0015] The individual (channel-shaped) channel recesses can be produced in an efficient manner by a forming process, in particular by a deep drawing process. In general, the end stator laminations can be designed to be produced by forming, in particular deep drawing, of flat laminations, in particular flat stator laminations. The end stator laminations can be produced in particular by such forming.

[0016] The end stator laminations can have a stator yoke region and a plurality of stator tooth regions. Here (when the end stator laminations are arranged on a flat end face of the stator body), the stator yoke region can form or be part of a stator yoke of the stator body and / or the plurality of stator tooth regions can form or be part of a corresponding plurality of stator teeth of the stator body. The end stator laminations can thus be part of a lamination stack of the stator body, so that the nozzle function of the end stator laminations can be provided in a particularly efficient manner (without affecting the power density of the electric machine).

[0017] The nozzle recess or recesses of the end-face stator core are preferably arranged in the region of the stator yoke. The individual coolant jets can thus be directed particularly precisely (from the outside) onto the winding heads.

[0018] According to another aspect, a stator body for a stator of an electric machine is described. The stator body comprises a base body having a plurality of (identically configured) flat stator laminations. The base body extends from a first outer end face to an opposite second outer end face. The stator can have a winding head on each of the two outer end faces.

[0019] The stator body further comprises a first end face stator lamination, which is constructed as described herein and is arranged on a first outer end face of the base body. In addition, the stator body can have a second end face stator lamination, which is constructed as described herein and is arranged on a second outer end face of the base body. As has already been explained further above, a particularly efficient and reliable cooling of the stator winding head can be achieved by means of the one or two end face stator laminations.

[0020] The stator body, in particular the base body, can have at least one axial coolant channel, which extends through the base body in the axial direction. The first and / or second end face stator laminations can be respectively configured to guide the coolant from the at least one axial coolant channel to the one or more nozzle recesses of the corresponding end face stator laminations. As a result, particularly reliable cooling of the entire stator, in particular the entire stator winding, can be achieved.

[0021] The base body may include a first sub-body and a second sub-body, wherein the first sub-body and the second sub-body respectively have one or more axial coolant channels, and the first sub-body and the second sub-body are arranged in sequence along the axial direction. The two sub-bodies may respectively have a portion of the stator laminations of the base body (for example, half of each).

[0022] The base body may include a stator component arranged between the first sub-body and the second sub-body, the stator component being configured to guide coolant from the outside of the stator body into the one or more axial coolant channels of the first sub-body and the second sub-body. Here, the stator component itself may be configured as a stator lamination. Thus, the coolant may be centrally supplied to the stator body, so that particularly reliable and efficient cooling may be achieved.

[0023] According to another aspect, a stator for an electric machine is described. The stator comprises a stator body constructed as described herein. The stator further comprises a first winding head arranged on a first end face stator lamination and / or a second winding head arranged on a second end face stator lamination. Here, the first and / or second end face stator laminations are respectively configured to cause a coolant jet with a coolant onto the corresponding winding head to achieve efficient, reliable and targeted cooling of the corresponding winding head.

[0024] According to a further aspect, an electric machine, in particular a synchronous electric machine, is described, comprising a rotor and a stator constructed as described herein.

[0025] The electric machine can be configured to guide the coolant from the outer circumference of the stator body of the stator into one or more axial coolant channels of the stator body of the stator, in particular at a location arranged centrally in the axial direction between the two parts of the stator body. The electric machine can also be configured to accumulate coolant from the one or more axial coolant channels on at least one end face of the stator body of the stator, the coolant being used to cool the winding heads of the stator. The coolant can then be supplied to the one or more axial coolant channels again.

[0026] Thus, a coolant circuit for efficiently and reliably cooling the stator windings and / or winding heads of the stator may be provided.

[0027] According to a further aspect, a (road) motor vehicle, in particular a passenger car or a truck or a bus or a motorcycle, is described, which comprises an electric machine as described herein.

[0028] It should be noted that the methods, devices and systems described herein can be used not only individually but also in combination with other methods, devices and systems described herein. In addition, any aspects of the methods, devices and systems described herein can be combined with each other in various ways. In particular, the features of the claims can be combined with each other in various ways. In addition, the features listed in brackets should be understood as optional features. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is described in detail below with the help of embodiments.

[0030] Figure 1a An exemplary electric machine is shown;

[0031] Figure 1b An exemplary winding head on a stator end face is shown;

[0032] Figure 2a shows an exemplary cross section of a stator;

[0033] Figure 2b shows exemplary stator slots;

[0034] Figure 3a An isometric view showing an exemplary multi-piece stator body with end-face stator laminations;

[0035] Figure 3b an isometric view showing an exemplary end-face stator lamination; and

[0036] Figure 3c An isometric view of an exemplary end-face stator lamination and winding heads is shown. DETAILED DESCRIPTION

[0037] As mentioned at the beginning, this paper aims to improve the efficiency and target accuracy of cooling the stator winding heads of electric motors. Figure 1a The exemplary electric machine 100 is shown in a view perpendicular to the axis 101 of the electric machine 100. The axis 101 of the electric machine 100 may correspond to the longitudinal axis of the stator 110 and / or the rotation axis of the rotor 120 of the electric machine 100. The axis 101 extends along the z-axis of the illustrated Cartesian coordinate system.

[0038] The motor 100 includes a stator 110 having a plurality of stator windings 111 which are arranged at different angular positions around the rotation axis of the rotor 120 and are used to generate an electromagnetic rotating field. The stator 110 is surrounded by a housing 135 of the motor 100. Each stator winding 111 can be arranged in a stator slot between two directly adjacent stator teeth 113 of the stator 110. An air gap 102 is arranged between the stator 110 and the rotor 120.

[0039] Furthermore, the motor 100 comprises a rotor 120 which is driven by a rotating field caused by the stator 110. The rotor 120 is fixedly connected to a shaft 101 driven by the motor 100 (the shaft is connected to the rotor shaft of the rotor 120 or corresponds to the rotor shaft of the rotor 120). The rotor 120 comprises a rotor body 122.

[0040] The rotor 120 of the electric machine 100 may include an iron lamination stack (eg, composed of mutually insulated laminations) as a rotor body 122. In a corresponding manner, the stator body of the stator 110 may also consist of individual (mutually insulated) stator laminations (eg, iron laminations).

[0041] The stator 110 extends along the rotation axis or longitudinal axis of the rotor 120 from a first end face to an opposite second end face. In this case, the stator 110 has different magnetic stator teeth 113, which are arranged at different angular positions around the rotation axis of the rotor 120 (uniformly distributed). A coil (i.e., one or more turns or windings 111) can be arranged around each stator tooth 113, and a magnetic field is generated by the coil. The individual stator teeth 113 can thus form a magnetic pole of the stator 110. The turns or windings 111 each form a winding head on the end face of the stator 110.

[0042] A stator slot is formed between two directly adjacent stator teeth 113 of the stator 110, in which a winding 111 is arranged. The stator slot extends along the longitudinal axis (ie, along the z-axis) from a first end face of the stator 110 to an opposite second end face. The winding 111 arranged in the stator slot can be electrically insulated from the (conductive) stator body by means of a slot insulator.

[0043] Figure 1bA winding head 115 formed by a stator winding 111 on an end face of a stator 110 is shown. The winding head 115 is usually cooled by means of a (liquid) coolant 130. The coolant 130 can be sprayed onto the winding head 115, for example, by means of one or more nozzles (not shown). In the stator 110 described herein, the coolant 130 for cooling the winding head 115 can be obtained in an efficient manner from the coolant channels of the stator body of the stator 110.

[0044] Figure 2a The air gap 102 and the adjacent rotor 120 and stator 110 are shown in a partial cross-sectional view. Figure 2a Three stator slots 202 are shown, each of which is located between two directly adjacent stator teeth 113 of the stator body 118. A stator winding 111 is arranged in each of the stator slots 202, each of which is surrounded by a (prismatic) slot insulator 201. As described above, each stator slot 202, each stator winding 111 and each slot insulator 201 extend from a first end face 116 of the stator 110 along the longitudinal axis, i.e., along the z-axis, to an opposite second end face 116.

[0045] Each stator tooth 113 may have a stator shoe 203 at the end facing the air gap 102, and the stator shoe extends in a tangential direction along the air gap 102. The stator shoes 203 of two directly adjacent stator teeth 113 form a wall of the stator slot 202 located therebetween (the wall extends between the stator slot 202 and the air gap 102). However, the stator shoes 203 of two directly adjacent stator teeth 113 usually do not touch each other, so that the stator slot 202 has a gap 204 toward the air gap 102, and the gap extends along the longitudinal axis from the first end face 116 of the stator 110 to the opposite second end face 116. Figure 2a A stator slot 202 labeled "B" is shown. Figure 2b Shown in enlarged form.

[0046] Figure 3a An exemplary multi-piece stator body 118 of the stator 110 is shown. The stator body 118 includes a first sub-body 301 and a second sub-body 302, each of which is arranged in sequence along the longitudinal axis of the stator body 118. Each sub-body 301, 302 can be composed of a plurality of (identically configured) stator laminations, for example, 50 or more, or 100 or more stator laminations. In addition, the two sub-bodies 301, 302 can be structurally identical, so that the two sub-bodies 301, 302 respectively form half of the base body 301, 302 of the stator body 118.

[0047] The stator body 118 can have one or more hollow coolant channels 305 in the stator yoke and / or in each stator tooth 113 , each extending in the axial direction, ie in the longitudinal direction. The coolant 130 can be guided through each axial coolant channel 305 in order to cool the stator winding 111 .

[0048] A central stator component 303, in particular a central stator lamination, may be provided between the two parts 301, 302, and the central stator component abuts against the central end faces 316 of the two parts 301, 302. The central stator component 303 may have a stator yoke and stator teeth 113. In addition, the central stator component 303 may be configured to guide the coolant 130 from the outside of the stator body 118 into the axial coolant channels 305 of the two parts 301, 302.

[0049] As mentioned at the outset, the present invention is concerned with efficient and targeted cooling of the winding heads 115 on the outer end face 116 of the stator body 118. For this purpose, Figure 3a The stator bodies 118 shown in FIG. 1 have one end stator lamination 310 on the outer end faces 116 . In particular, the first end stator lamination 310 is arranged on the outer end face 116 of the first sub-body 301 , and the second end stator lamination 310 is arranged on the outer end face 116 of the second sub-body 302 .

[0050] The end stator laminations 310 may each have a plurality of nozzle recesses 311, which are arranged circumferentially on the yoke of the end stator laminations 310. Here, the nozzle recesses 311 may each be configured as local, possibly concave or pit-shaped recesses of the stator laminations 310. The individual nozzle recesses 311 may be formed from a flat lamination component, for example, in the context of a deep drawing process.

[0051] Figure 3b and 3c Further details of the end stator laminations 310 are shown. In particular Figure 3b The individual nozzle recesses 311 are shown to have a hole 312, such as a drilled hole, through which the coolant 130 can exit. In particular, a coolant jet (such as a jet) onto the stator 110 winding head 115 can be caused by the hole 312 of the nozzle recess 311. Figure 3c as shown).

[0052] Figure 3b It is further shown how the coolant 130 from the axial coolant channel 305 is directed to the one or more nozzle recesses 311 through one or more channel recesses 313 of the end stator laminations 310. Each channel recess 313 may be formed by a channel-shaped recess in the end stator laminations 310.

[0053] In general, the end face stator laminations 310 can be manufactured in an efficient manner by deformation, especially deep drawing, of flat laminations. Here, each nozzle recess 311 and / or each channel recess 313 can be formed by a deformation process, and the channel recess extends between the axial coolant channel 305 and the nozzle recess 311.

[0054] One end stator core 310 may be fixed (eg, adhesively bonded) to each outer end face 116 of stator body 118. Both end stator cores 310 may be designed identically and / or mirror-symmetrically (with a mirror-image flatness oriented perpendicularly to the longitudinal axis of stator body 118).

[0055] Coolant nozzles (i.e., nozzle recesses 311 each having a hole 312 ) can be formed in an efficient manner through the individual end face stator stacks 310 , which are reliably supplied with coolant 130 from the axial coolant channels 305 of the stator body 118 , thereby being able to reliably induce a coolant jet onto the winding head 115 (arranged on the end face stator stack 310 ).

[0056] The nozzles configured as recesses 311 in the end-face stator laminations 310 form cavities together with the adjacent (flat) end faces 116 of the stator body 118 parts 301, 302, in which the coolant 130 can be accumulated, so that sufficient coolant 130 can be provided for forming coolant jets. In addition, the channel-shaped recesses 313 in the end-face stator laminations 310 form end-face coolant channels together with the adjacent (flat) end faces 116 of the stator body 118 parts 301, 302, through which the coolant 130 from the axial coolant channels 305 can be guided to the respective nozzle recesses 311 in an efficient and reliable manner and accumulated there.

[0057] The formation of a relatively strong coolant jet enables reliable cooling of the winding head 115 on the outer end face 116 of the stator body 118. Furthermore, it can be reliably prevented that the coolant 130 enters the air gap 102 between the rotor 120 and the stator 110 and thereby impairs the efficiency of the electric machine 100.

[0058] Therefore, one or more deep-drawn laminations 310 can be directly integrated into the stacking process for manufacturing the stator body 118 of the stator 110. The deep-drawn laminations 310 are integrated on both sides, i.e., the end faces, of the stator body 118 in a way that prevents loss. With the aid of the laminations 310, all coolant 130 (in particular oil) leaving the stator body 118 is bundled and ejected through the holes 312 defined in the individual laminations 310 in order to wet the stator windings 113, 115 as well as possible. The individual holes 312 can be defined and / or varied in terms of the corresponding angles and / or positions. No additional components are required to cause the coolant jet, thereby achieving efficient installation.

[0059] The present invention is not limited to the embodiments shown. In particular, it should be noted that the description and the drawings are intended only to illustrate the principles of the proposed methods, devices and systems by way of example.

Claims

1. An end-face stator lamination (310) for a stator body (118) of a stator (110) of an electric machine (100), wherein: The end face stator laminations (310) are configured to be arranged on a flat end face (116) of a stator body (118); The end face stator lamination (310) has one or more nozzle recesses (311), each of which is configured to form one or more corresponding cavities for accommodating a coolant (130) together with the flat end face (116) of the stator body (310) when the end face stator lamination (310) is arranged on the flat end face (116) of the stator body (118); and The end-face stator lamination (310) has at least one hole (312) on each of the one or more nozzle recesses (311), wherein the hole is configured to form a coolant jet using a coolant (130) from a corresponding cavity.

2. The end face stator lamination (310) according to claim 1, wherein: The end face stator lamination (310) has a plurality of nozzle recesses (311), which are arranged around the longitudinal axis of the stator body (118) in a circumferential direction, in particular evenly distributed; and In particular, the end-face stator core (310) has four or more or eight or more nozzle recesses (311).

3. The end face stator lamination (310) according to claim 2, wherein: The position and / or orientation of the holes (312) in two different nozzle recesses (311) among the plurality of nozzle recesses (311) are different; and / or The bore (312) of the nozzle recess (311) is oriented toward a longitudinal axis extending toward the center of the stator body (118).

4. The end-face stator lamination (310) according to any one of the preceding claims, wherein: The stator body (118) has at least one axial coolant channel (305) extending in an axial direction; and The end face stator lamination (310) has one or more channel recesses (313), which are respectively configured to form one or more corresponding end face coolant channels between the axial coolant channel (305) and at least one nozzle recess (311) together with the flat end face (116) of the stator body (310) when the end face stator lamination (310) is arranged on the flat end face (116) of the stator body (118).

5. The end-face stator lamination (310) according to any one of the preceding claims, wherein: The end face stator lamination (310) comprises a stator yoke region and a plurality of stator tooth regions; When the end face stator lamination (310) is arranged on a flat end face (116) of a stator body (118), the stator yoke region forms a part of a stator yoke of the stator body (118) and the plurality of stator tooth regions form a part of a corresponding plurality of stator teeth (113) of the stator body (118); and The one or more nozzle recesses (311) are arranged in the region of the stator yoke.

6. The end-face stator lamination (310) according to any one of the preceding claims, wherein: The stator (110) has a winding head (115) on a flat end surface (116) of a stator body (118) provided with an end surface stator lamination (310), wherein the winding head protrudes from the flat end surface (116) of the stator body (118) in an axial direction; and The holes (312) of the one or more nozzle recesses (311) are each designed to cause a coolant jet directed toward the winding head (115) when the end-face stator core (310) is arranged on a flat end face (116) of the stator body (118).

7. The end-face stator lamination (310) according to any one of the preceding claims, wherein: The end-face stator core (310) is designed to be produced by forming, in particular deep drawing, flat cores, in particular flat stator cores.

8. A stator body (118) for a stator (110) of an electric machine (100), wherein: The stator body (118) comprises: A base body (301, 302) having a plurality of flat stator laminations, wherein the base body (301, 302) extends from a first outer end face (116) to an opposite second outer end face (116); and A first end-face stator lamination (310) which is configured according to any of the preceding claims and is arranged on a first outer end face (116) of the base body (301, 302); and / or A second end-face stator core (310) is configured according to any one of the preceding claims and is arranged on a second outer end face (116) of the base body (301, 302).

9. The stator body (118) according to claim 8, wherein: The stator body (118), in particular the base body (301, 302), has at least one axial coolant channel (305), which extends through the base body (301, 302) in an axial direction; and The first and / or second end-face stator laminations (310) are respectively configured to guide the coolant (130) from the at least one axial coolant channel (305) to the one or more nozzle recesses (311) of the corresponding end-face stator laminations (310).

10. The stator body (118) according to any one of claims 8 to 9, wherein: The base (301, 302) comprises a first sub-body (301) and a second sub-body (302), the first sub-body and the second sub-body respectively having one or more axial coolant channels (305), and the first sub-body and the second sub-body are arranged in sequence along the axial direction; and The base body (301, 302) comprises a stator component (303) arranged between a first sub-body (301) and a second sub-body (302), wherein the stator component is configured to guide a coolant (130) from outside the stator body (118) into the one or more axial coolant channels (305) of the first sub-body and the second sub-body (301, 302).

11. A stator (110) for an electric machine (100), wherein: The stator comprises: A stator body (118) constructed according to any one of claims 8 to 10; and A first winding head (115) is arranged on a first end face stator laminate (310) and / or a second winding head (115) is arranged on a second end face stator laminate (310); the first and / or second end face stator laminate (310) are respectively configured to induce a coolant jet having a coolant (130) onto the corresponding winding head (115).

12. An electric machine (100) comprising a rotor (120) and a stator (110) configured according to claim 11; the electric machine (100) being configured such that: The coolant (130) is guided from the outer peripheral surface of the stator body (118) of the stator (110) into one or more axial coolant channels (305) of the stator body (118) of the stator (110), especially at a location centrally arranged in the axial direction between two parts (301, 302) of the stator body (118); and A coolant (130) from the one or more axial coolant channels (305) is accumulated on at least one end surface (116) of a stator body (118) of the stator (110), the coolant being used to cool a winding head (115) of the stator (110).

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