Stator of driving motor and vehicle driving motor

Abstract

The utility model provides a stator of a driving motor and a vehicle driving motor, the stator comprises an iron core and coils, the inner circumferential side wall of the iron core is provided with a plurality of axial grooves for arranging the coils, the inner wall of each groove is provided with foaming insulation paper, the foaming insulation paper contains a foaming inhibitor to control the area position of surface foaming, and the foaming inhibitor is used for controlling the area position of surface foaming. After the foaming insulation paper is foamed, the foaming area expands so as to fix the coil in the radial direction and the tangential direction of the stator, and cooling oil fills a gap formed by the non-foaming area and the coil in the groove so as to play a cooling role.

Description

Technical Field

[0001] The utility model relates to the field of vehicle drive motors, in particular to the internal structure of a drive motor stator. Background Art

[0002] The drive motor on an electric vehicle is one of the cores of the entire drive system, and its service life and reliability are directly related to the life and safety of the whole vehicle. During the operation of the motor, the winding coils will generate heat due to the passing of current. If this heat cannot be dissipated in time, it will cause the temperature of the motor to rise, thereby affecting the performance and life of the motor. Therefore, the winding cooling design is an important part of the motor design.

[0003] A reliable and compact motor winding cooling design can also improve the operating efficiency of the motor, reduce energy consumption, and ensure that the temperature of the motor can be maintained within the normal range during long-term and high-load operation, thereby guaranteeing the performance and life of the motor.

[0004] The existing motor winding cooling solutions include modifying the shape of the copper wire in the stator to reserve a cooling oil channel. However, such solutions often occupy a large slot area, greatly reducing the slot fill factor, and require additional fixing and insulation settings, and the modification of the winding coils is complex, bringing inconvenience to production. There are also some solutions that form a coolant channel by adding a thermosetting plastic layer in the grooves of the stator. However, it requires precise injection molding technology and the plastic layer occupies a large space. There are also some cooling solutions that use the method of dripping paint in the grooves of the stator for cooling. However, compared with the cooling oil with lower viscosity that can fill the groove gap, the paint dripping in the prior art can only fill 80% of the void space in the slot, and it is easy to generate bubbles. When the motor is working, the electric field is concentrated at the bubbles, which will damage the insulation setting in the stator.

[0005] In addition, some of the existing solutions for setting cooling oil channels in the stator grooves add a plastic layer or rely on adhesive to locally fit the stator or the coil. Due to the limited size of the stator grooves, it undoubtedly increases the difficulty and complexity in the manufacturing process. At the same time, the cooling oil has a certain viscosity, and a gap with too fine a width cannot make the cooling oil flow therein to achieve an effective cooling effect.

[0006] In order to overcome the above-mentioned defects of the prior art, the field urgently needs a stator of a drive motor and a vehicle drive motor for cooling the motor winding. By adding foamed insulating paper in the groove on the inner circumference of the stator, and making the foamed insulating paper foam only in some designated position areas to form a cooling oil channel with a certain width, the cooling oil is in direct and full contact with the conductor in the slot and can flow to all parts of the stator, thereby greatly improving the heat dissipation capacity of the winding. At the same time, it has little impact on the slot fill rate, is convenient in process, does not require changing the winding coil, and does not need to affect the fixation and insulation setting of the coil in the stator, thereby improving the continuous performance and service life of the motor. Utility Model Content

[0007] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0008] In order to overcome the above-mentioned defects of the prior art, the utility model provides a stator for a drive motor, which includes an iron core and a coil. The inner circumferential side wall of the iron core is provided with multiple axial grooves for arranging the coil. The inner wall of the groove is provided with foamed insulating paper. The foamed insulating paper contains a foaming inhibitor to control the position of the foamed area on its surface. After the foamed insulating paper is foamed, the foamed area expands to fix the coil in the radial and / or tangential direction of the stator, and cooling oil fills the gap formed by the unfoamed area and the coil in the groove to play a cooling role.

[0009] In one embodiment, preferably, in the stator of the drive motor provided by the present invention, the foamed insulating paper sequentially includes at least a basic insulating layer, a foaming material layer and a foaming material fixing layer, the foamed insulating paper is adhered to the inner wall of the groove of the iron core on the outside of the basic insulating layer, the foaming inhibitor is located at a specified position in the foaming material layer, and the foaming material in the foaming material layer without the foaming inhibitor seeps into the foaming material fixing layer during foaming to fix the coil in radial contact with the stator.

[0010] In one embodiment, preferably, in the stator of the driving motor provided by the present invention, the foaming inhibitor is distributed in the foaming material layer in the axial direction of the iron core in the form of strips, and after the foamed insulating paper is foamed, a plurality of cooling oil channels with an axial width of at least 0.6 mm are formed on the inner wall of the groove.

[0011] In one embodiment, preferably, in the stator of the driving motor provided by the present invention, the position area of the foaming inhibitor in the foaming material layer is distributed in a network pattern, and after the foamed insulating paper is foamed, a plurality of block-shaped foaming protrusions are formed on the inner wall of the groove, and cooling oil channels are formed between the plurality of block-shaped protrusions, and the width of the cooling oil channels is at least 0.6 mm.

[0012] In one embodiment, preferably, in the stator of the drive motor provided by the present invention, the foaming inhibitor is sprayed or printed at a specified position of the foaming material layer so that the width of the cooling oil channel formed in the unfoamed area after the foamed insulating paper is foamed is at least 0.6 mm.

[0013] In one embodiment, preferably, in the stator of the drive motor provided by the present invention, the cooling oil is injected into the stator from the middle of the iron core, fills the gap between the unfoamed area and the coil, and flows toward both ends of the iron core.

[0014] In one embodiment, preferably, in the stator of the drive motor provided by the present invention, the cooling oil is injected into the stator from the end of the iron core, fills the gap between the unfoamed area and the coil and flows along the groove to the other end of the iron core.

[0015] Another aspect of the present invention provides a drive motor for a vehicle, comprising a stator as described in any one of the above items.

[0016] The stator of the drive motor and the vehicle drive motor provided by the utility model are provided with foamed insulating paper in the grooves on the inner circumference of the stator, and the foamed insulating paper is foamed only in a part of the designated position area to form a cooling oil channel with a certain width, so that the cooling oil is in direct and full contact with the conductor in the slot and can flow to all parts of the stator, thereby greatly improving the heat dissipation capacity of the winding, having little effect on the slot fill rate, and convenient process. There is no need to change the winding coil, and there is no need to affect the fixation and insulation setting of the coil in the stator, thereby improving the continuous performance and service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

[0018] Figure 1 1 is a schematic cross-sectional view of the internal structure of a groove of a drive motor stator according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the hierarchical structure of the foamed insulation paper placed in the stator groove of the drive motor according to one embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the strip-shaped foaming structure of the foamed insulating paper placed in the stator groove of the drive motor, shown according to an embodiment of the present utility model;

[0021] Figure 4 It is a schematic diagram of the mesh-shaped foaming structure of the foamed insulating paper placed in the stator groove of the drive motor, shown according to an embodiment of the present utility model;

[0022] Figure 5 It is a three-dimensional diagram of the mesh-shaped foaming structure of the foamed insulating paper in the stator groove, shown according to an embodiment of the present utility model;

[0023] Figure 6 It is a schematic diagram of the oil flow direction when the stator is injected with cooling oil from the middle position, shown according to an embodiment of the present utility model; and

[0024] Figure 7 It is a schematic diagram of the oil flow direction when the stator is injected with cooling oil from the end position, shown according to an embodiment of the present utility model.

[0025] For clarity, the following gives a brief description of the reference numerals:

[0026] 101 Iron core

[0027] 102 Coil

[0028] 103 Groove

[0029] 104 Foamed insulating paper

[0030] 1041 Foaming area

[0031] 1042 Non-foaming area

[0032] 200 Foamed insulating paper

[0033] 201 Basic insulating layer

[0034] 202 Foaming material layer

[0035] 203 Foaming material fixing layer

[0036] 204 Hot melt adhesive

[0037] 205 Iron core

[0038] 206 Coil

[0039] 300 Foamed insulating paper

[0040] 301 Non-foaming area

[0041] 302 Foaming area

[0042] 400 Foamed Insulating Paper

[0043] 401 Unfoamed Area

[0044] 402 Foamed Area Detailed Embodiment

[0045] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model will be introduced in combination with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details will be included in the following description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusion or obscuring the key points of the present utility model, some specific details will be omitted in the description.

[0046] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0047] In addition, the "upper", "lower", "left", "right", "top", "bottom", "horizontal", and "vertical" used in the following description should be understood as the orientations shown in this section and the related drawings. This relative term is only for convenience of description, and it does not mean that the device described needs to be manufactured or operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0048] It can be understood that although the terms "first", "second", "third", etc. can be used here to describe various components, regions, layers, and / or parts, these components, regions, layers, and / or parts should not be limited by these terms, and these terms are only used to distinguish different components, regions, layers, and / or parts. Therefore, the first component, region, layer, and / or part discussed below can be referred to as the second component, region, layer, and / or part without departing from some embodiments of the present utility model.

[0049] In order to overcome the above-mentioned defects of the prior art, the field urgently needs a stator of a drive motor and a vehicle drive motor for cooling the motor winding. By adding foamed insulating paper in the groove on the inner circumference of the stator, and making the foamed insulating paper foam only in some designated position areas to form a cooling oil channel with a certain width, the cooling oil is in direct and full contact with the conductor in the slot and flows to all parts of the stator, thereby greatly improving the heat dissipation capacity of the winding. At the same time, it has little effect on the slot fill rate of the coil, the process is simple, there is no need to change the winding coil, and there is no need to affect the fixation and insulation setting of the coil in the stator, thereby improving the continuous performance and service life of the motor.

[0050] Figure 1 The figure is a cross-sectional schematic diagram of the internal structure of the groove of the stator of the driving motor according to one embodiment of the present invention.

[0051] Please refer to Figure 1 The stator of the driving motor provided by the present invention includes an iron core 101 and a coil 102. The inner side wall of the iron core is provided with a plurality of axial grooves 103 for arranging the coil 102. The inner wall of the groove 103 is provided with foamed insulating paper 104. The foamed insulating paper 104 contains a foaming inhibitor to control the area position of foaming on its surface.

[0052] like Figure 1 As shown, after the foamed insulating paper 104 is foamed, the foamed area 1041 expands to fix the coil 102 in the radial and / or tangential directions of the stator, and the cooling oil fills the gap formed by the unfoamed area 1042 and the coil 102 in the groove 103 to play a cooling role.

[0053] Foamed insulation paper is a special composite material made by combining insulating paper with a foaming material (such as polyethylene or polystyrene). During the manufacturing process, the foaming material is applied to the surface of the insulating paper and then heated to expand and form foam. Foamed insulation paper has excellent electrical insulation properties, effectively isolating the current and preventing failures caused by current leakage or short circuits within the motor. This ensures safe operation and long-term stability of the motor. Foamed insulation paper has a low thermal conductivity, which effectively blocks heat transfer and reduces the temperature rise caused by heat accumulation within the motor. This helps maintain stable operation of the motor and prevents damage from overheating.

[0054] Furthermore, compared to traditional insulation materials, foamed insulation paper is lighter, making it easier to install and arrange within motors. Its softness and plasticity also allow it to adapt to motor structures of various complex shapes and sizes. Foamed insulation paper also exhibits excellent high-temperature and aging resistance, enabling stable operation in high-temperature environments for extended periods while maintaining its insulation properties and mechanical strength. Furthermore, its mechanical strength and toughness allow it to withstand vibration and shock during motor operation, protecting the motor's internal structure and windings. Foamed insulation paper is typically made of environmentally friendly materials, ensuring minimal environmental pollution. This meets modern industry's requirements for environmental protection and sustainable development.

[0055] Figure 2 The figure is a schematic diagram of the hierarchical structure of the foamed insulating paper placed in the stator groove of the drive motor according to one embodiment of the present invention.

[0056] Please refer to Figure 2 In one embodiment, in the drive motor stator provided by the present invention, the foamed insulating paper 200 includes a basic insulating layer 201, a foaming material layer 202 and a foaming material fixing layer 203 in sequence. The foamed insulating paper 200 is adhered to the inner wall of the groove of the iron core 205 on the outside of the basic insulating layer 201, for example, by coating hot melt adhesive 204. The foaming inhibitor is located at a specified position in the foaming material layer 202. The foaming material in the foaming material layer 202 without the foaming inhibitor seeps into the foaming material fixing layer 203 during foaming to contact and fix the coil 206 in the radial and / or tangential direction of the stator.

[0057] Figure 3 The figure is a schematic diagram of a strip foaming structure of foamed insulation paper placed in a groove of a drive motor stator according to an embodiment of the present invention.

[0058] Figure 3 FIG. 1 is a schematic diagram of the expanded foam insulation paper 300 in one embodiment. Figure 3 As shown, a foaming inhibitor forms a strip-shaped foam structure on the foamed insulating paper 300, where the blue area represents the unfoamed area 301 and the yellow area represents the foamed area 302. The strip-shaped structure extends in the axial direction of the motor stator, allowing cooling oil to flow between the gaps in the strips, fully contacting and relatively evenly cooling all parts of the stator.

[0059] In particular, in a preferred embodiment, after the foamed insulation paper 300 is foamed, the blue unfoamed area 301 forms a cooling oil channel, and the width of the oil channel is at least 0.6 mm.

[0060] The foamed area forms a bulge to fix the coil, and the unfoamed area forms a cooling oil channel. In order to better fix the coil and allow the cooling oil to be injected and flow, the oil channel width needs to be designed specifically with the coil width and the characteristics of the cooling oil.

[0061] More specifically, those skilled in the art will appreciate that the cooling oil within the drive motor stator, shared with the reduction gearbox, has a certain viscosity. If the width of the oil channel is too small, for example, less than 0.5 mm, injecting the cooling oil into the channel requires significant oil pressure, which undoubtedly increases assembly difficulty. However, in the stator provided by the present invention, an oil channel is formed on the foamed insulating paper using a foaming inhibitor, and the oil channel is made to have a certain width, for example, not less than 0.6 mm. This reduces the injection oil pressure, facilitates the production and assembly process, and thus reduces production costs.

[0062] Figure 4 The figure is a schematic diagram of a reticulated foaming structure of a foamed insulation paper placed in a groove of a stator of a driving motor according to an embodiment of the present invention.

[0063] Figure 4 FIG. 4 is a diagram showing the unfolding of the foamed insulating paper 400 in one embodiment. Figure 4 As shown, a mesh foaming structure is formed on the foamed insulating paper 400 by a foaming inhibitor, wherein the blue area is the unfoamed area 401, and the yellow area is the foamed area 402. The cooling oil can flow between these mesh gaps and can flow more fully and evenly to various parts of the stator winding, thereby increasing the contact between the cooling oil and the winding, thereby achieving a better cooling effect.

[0064] Similar to the strip oil channels, preferably, the width of the mesh oil channels here is also not less than 0.6 mm, so that the cooling oil can be injected at conventional oil pressure, ensuring that the cooling oil can flow smoothly in the oil channels without increasing the difficulty of the production process.

[0065] Figure 5 FIG1 is a three-dimensional diagram of a reticulated foam structure of foam insulation paper in a stator groove according to an embodiment of the present invention.

[0066] Figure 5 The three-dimensional structure of the foamed insulation paper in the stator groove is more clearly shown, such as Figure 5 As shown, the foaming area forms a plurality of three-dimensional block protrusions, which can fix the coil winding placed therein inward, and the cooling oil can flow in the gaps formed between the plurality of block protrusions, thereby more fully contacting the winding coil and playing a better cooling role. Figure 5The outermost layer of the insulating paper shown is attached to the inner wall of the stator slot with hot-melt adhesive. While minimizing slot space, it provides excellent insulation, secures the coils, and guides cooling oil. The meshed oil channels ensure full contact between the cooling oil and the windings, improving heat dissipation and, consequently, the motor's continuous operating performance.

[0067] It should be noted that the foaming position and shape of the foamed area of the foamed insulating paper are only illustrative here and are not intended to limit the scope of protection of the present invention. The foaming shapes in the embodiments of this article are strip and mesh shapes. In fact, the foaming areas can also be distributed in other shapes, and there is no need for horizontal and vertical arrangements. It is only necessary to allow the cooling oil to flow inside the stator groove and to be able to fully and evenly contact all places. Similar foamed insulating papers can be used in the stator of the drive motor provided by the present invention and should also be included in the scope of protection of the present invention.

[0068] In one embodiment, the foaming inhibitor is sprayed or printed on a designated position of the foaming material layer so that the width of the cooling oil channel formed in the unfoamed area of the foamed insulation paper after foaming is at least 0.6 mm.

[0069] The production process of foamed insulating paper typically includes slurry preparation, pulp conditioning, mechanical sizing, foaming, drying, and coil packaging. During the foaming process, a foaming material is typically applied to the surface of the insulating paper and heated to expand it. In the stator of the drive motor provided by the present invention, the foamed insulating paper used during the foaming process is not only coated with the foaming material but also sprayed or printed with a foaming inhibitor at designated locations, thereby forming the strip-shaped or mesh-shaped foam structure described above.

[0070] Spraying or printing a foaming inhibitor can easily control the foaming position of the insulating paper, thereby ensuring in advance that a cooling oil channel with a width of more than 0.6 mm is formed in the unfoamed area, so that the cooling oil can be injected into the oil channel and flow to various parts of the stator to achieve a cooling effect.

[0071] It is understood that the spraying or printing mentioned here is merely an illustrative example, intended to clarify the specific method of adding a foaming inhibitor to the foamed insulation paper used in the present invention to control the location and area of foaming, and is not intended to limit the scope of protection of the present invention. In fact, foaming inhibitors can also be added to the foamed insulation paper through other preparation methods. Similar foamed paper structures or materials that can achieve a specific location can be used in the stator of the drive motor provided by the present invention and should be included in the scope of protection of the present invention.

[0072] As can be seen, the present invention adds a foaming inhibitor during the preparation of the foamed insulation paper, thereby controlling the location of the foamed areas on the surface of the insulation paper and forming cooling oil channels in the unfoamed areas. This makes the process convenient and easy to implement. Some prior art solutions incorporate multiple strip-shaped protrusions into the insulation layer and then apply adhesive to the protrusions. However, due to the small overall size of the stator slots, the localized adhesive application is very delicate and complex, which inevitably increases the complexity of the preparation process and, in turn, increases production costs.

[0073] Furthermore, once the insulating paper is prepared, it is glued into the stator grooves. After the stator is assembled, the foam layer is heated or otherwise expanded to form protrusions that secure the coils tangentially and / or radially. As can be readily understood, the coils wound within the stator have irregular shapes. Compared to some prior art insulating paper solutions that adhere to the coils with glue, this method of securing the coils through foaming and extrusion can better secure these irregularly shaped coils, achieving a better fit without adding additional assembly costs. Figure 6 The figure is a schematic diagram showing the flow of cooling oil when the cooling oil is injected into the stator from the middle position according to one embodiment of the present invention.

[0074] like Figure 6 As shown, in one embodiment, the present invention provides a stator for a driving motor, wherein the cooling oil is injected into the stator from the middle of the iron core, fills the gap between the unfoamed area and the coil, and flows toward both ends of the iron core.

[0075] Figure 7 The figure is a schematic diagram showing the flow of cooling oil injected into the stator from the end position according to one embodiment of the present invention.

[0076] like Figure 7 As shown, in one embodiment, the stator of the driving motor provided by the present invention, after the cooling oil is injected into the stator from the end of the iron core, fills the gap between the unfoamed area and the coil and flows along the groove to the other end of the iron core.

[0077] Regardless of the oil inlet method, the motor stator provided by the utility model saves space in the slot by pasting foamed insulating paper in the groove and setting a special foaming position structure on the foamed insulating paper, so that the cooling oil can flow along the gap in the foamed area of the insulating paper, thereby fully contacting the winding coil, thereby improving the heat dissipation capacity and motor working performance.

[0078] In addition, since the oil channel formed by the foaming of the insulating paper in the stator provided by the present invention has a certain width, there is no need to increase the oil pressure when the oil is introduced, and it is ensured that the oil with viscosity can flow to various places in the groove oil channel formed by the foaming to fully achieve the cooling effect.

[0079] On the other hand, the present utility model also provides a driving motor, which includes the stator described in any one of the above, and the foamed insulating paper described above is pasted in the stator groove. By setting the position of the special foaming area, a channel for cooling oil is formed, thereby improving the heat dissipation capacity of the motor. At the same time, the insulating paper occupies a small space in the slot, without the need to additionally modify the winding coil, nor to modify the original insulation and fixing structure inside the motor. The production process is simple, improving the performance of the motor.

[0080] The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stator of a drive motor, the stator comprising an iron core and a coil, characterized in that, The inner circumferential side wall of the iron core is provided with a plurality of axial grooves for arranging the coils. The inner wall of the grooves is provided with foamed insulating paper, and the foamed insulating paper contains a foaming inhibitor to control the position of the foaming area on its surface. After the foamed insulating paper foams, the foaming area expands to fix the coils in the radial and / or tangential direction of the stator. Cooling oil fills the gap formed between the unfoamed area and the coils in the grooves to play a cooling role.

2. The stator according to claim 1, characterized in that, The foamed insulating paper sequentially includes at least a base insulating layer, a foaming material layer, and a foaming material fixing layer. The foamed insulating paper is pasted on the inner wall of the groove of the iron core on the outer side of the base insulating layer. The foaming inhibitor is located at a specified position in the foaming material layer. The foaming material in the foaming material layer without the foaming inhibitor oozes out to the foaming material fixing layer during foaming to contact and fix the coils in the radial and / or tangential direction of the stator.

3. The stator according to claim 2, wherein, The foaming inhibitor is distributed in a strip shape along the axial direction of the iron core in the foaming material layer. After the foamed insulating paper foams, a plurality of axial cooling oil channels with a width of at least 0.6 mm are formed on the inner wall of the groove.

4. The stator according to claim 2, wherein, The position area of the foaming inhibitor is distributed in a mesh shape in the foaming material layer. After the foamed insulating paper foams, a plurality of block-shaped foaming protrusions are formed on the inner wall of the groove. Cooling oil channels are formed between the plurality of block-shaped foaming protrusions, and the width of the cooling oil channels is at least 0.6 mm.

5. The stator according to claim 2, characterized in that, The foaming inhibitor is sprayed or printed at a specified position in the foaming material layer so that the width of the cooling oil channels formed in the unfoamed area after the foamed insulating paper foams is at least 0.6 mm.

6. The stator according to claim 1, characterized in that, After the cooling oil is injected into the stator from the middle of the iron core, it fills the gap between the unfoamed area and the coils and flows towards both ends of the iron core.

7. The stator according to claim 1, characterized in that, After the cooling oil is injected into the stator from the end of the iron core, it fills the gap between the unfoamed area and the coils and flows along the groove towards the other end of the iron core.

8. A vehicle drive motor, characterized in that, A stator as described in any one of claims 1 to 7 is included.

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