Electric machine comprising cooling structure

Abstract

An electric machine includes a cooling structure configured to directly cool a coil of a stator of the electric machine. The stator includes a stator core and a coil. The stator core may include a plurality of teeth configured to have a coil wound thereon; a plurality of slots separated by teeth; and a flow path configured to communicate with the slots through the stator core from an outer periphery of the stator core, and such that oil is supplied through the flow path.

Description

TECHNICAL FIELD

[0001] The disclosure relates to an electric machine, and more particularly, to an electric machine including a cooling structure. BACKGROUND

[0002] An electric machine receives electric power to generate a rotational force. Recently, research and development of an electric machine that drives a vehicle instead of an engine are actively being conducted.

[0003] An electric machine includes a stator and a rotor. The rotor can rotate relative to the stator through electromagnetic interaction between the stator and the rotor. For example, the stator can have a coil wound thereon, and the rotor can have a coil wound thereon or a permanent magnet installed therein. When the coil of the stator is magnetized by the current applied thereto, the rotor can rotate through interaction with the coil or the permanent magnet of the rotor.

[0004] Since a large amount of heat is generated by the current applied to the coil during the operation of the electric machine, the electric machine is equipped with a cooling structure to ensure stable operation thereof.

[0005] In general, the cooling structure of the electric machine indirectly cools the electric machine or removes heat of the coil exposed to the outside using a refrigerant. Such a structure cannot directly cool the heat generated by the coil inside the stator, which limits its cooling performance.

[0006] The foregoing merely is a background information to assist in understanding the disclosure and does not constitute prior art known to those skilled in the art. SUMMARY

[0007] In view of the above-described problems occurring in the related art, the disclosure provides an electric machine that can effectively remove heat generated by a stator through direct cooling.

[0008] The disclosure provides an electric machine capable of improving the continuous output and efficiency of the electric machine through a cooling structure.

[0009] The disclosure aims to achieve miniaturization of an electric machine through a cooling structure.

[0010] The purpose of the disclosure is not limited to the above-described purpose, and other purposes not mentioned above can be clearly understood by those skilled in the art from the following description.

[0011] In order to achieve the above-described purpose of the disclosure, and to perform the following feature functions of the disclosure, the features of the disclosure are as follows.

[0012] According to some forms of the disclosure, the stator can include a stator core and a coil. The stator core includes teeth configured to have the coil wound thereon, a plurality of slots partitioned by the teeth, and a flow path configured to be communicated with the slots through the stator core from an outer circumference of the stator core and to cause oil to be supplied through the flow path.

[0013] According to some forms of the present disclosure, a cooling system of an electric machine can include a stator, an oil chamber disposed at a lower portion of the stator, a pump configured to guide oil from the oil chamber into a flow path of the stator, and a heat exchanger arranged to exchange heat with the oil.

[0014] According to some forms of the present disclosure, an electric machine can include a stator including a stator core and a coil, and a rotor configured to be rotatable with respect to the stator. The stator core can include a plurality of teeth configured to have the coil wound thereon, a plurality of slots partitioned by the teeth, and a flow path configured to be communicated with the slots through the stator core from an outer periphery of the stator core and such that oil is supplied through the flow path.

[0015] According to some embodiments of the present disclosure, a vehicle can include an electric machine.

[0016] As described above, according to the present disclosure, an electric machine capable of effectively removing heat generated by a stator through direct cooling can be provided.

[0017] According to the present disclosure, an electric machine capable of improving a continuous output and efficiency of the electric machine through a cooling structure can be provided.

[0018] According to the present disclosure, an electric machine capable of realizing a small size of the electric machine through a cooling structure can be provided.

[0019] Effects of the present disclosure are not limited to what has been described hereinabove merely by way of example, and additional effects will be appreciated from the following description by persons ordinarily skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a view to partially show a stator core of an electric machine in an embodiment of the present disclosure;

[0022] Figure 2 is a view to partially show a stator core of an electric machine in an embodiment of the present disclosure;

[0023] Figure 3 is a view to partially show a stator core of an electric machine in an embodiment of the present disclosure;

[0024] Figure 4 is a view to show a cooling system of an electric machine according to an embodiment of the present disclosure;

[0025] Figure 5 and Figure 6 is a perspective view to show a portion of a stator according to an embodiment of the present disclosure;

[0026] Figure 7A For along Figure 6 Cross-sectional view of line A1-A1 in the middle;

[0027] Figure 7B For along Figure 6 Cross-sectional view of line A2-A2 in the middle;

[0028] Figure 8A A cross-sectional view showing a portion of the stator according to an embodiment of the present disclosure and illustrating the flow of oil;

[0029] Figure 8B A perspective view showing a portion of the stator according to an embodiment of the present disclosure and illustrating the flow of oil;

[0030] Figure 9A A perspective view showing a portion of the stator according to an embodiment of the present disclosure;

[0031] Figure 9B and Figure 9C To show the oil passing through Figure 9A A view of the flow path shown;

[0032] Figure 10 A cross-sectional view showing a portion of the stator according to an embodiment of the present disclosure;

[0033] Figure 11A For along Figure 10 Cross-sectional view of line B1-B1 in the middle;

[0034] Figure 11B For along Figure 10 Cross-sectional view of line B2-B2 in the middle;

[0035] Figure 11C For along Figure 10 Cross-sectional view of line B3-B3 in the middle;

[0036] Figure 11D For along Figure 10 Cross-sectional view of line B4-B4 in the middle;

[0037] Figure 12A A perspective view showing a portion of the stator according to an embodiment of the present disclosure and oil flowing through a flow path;

[0038] Figure 12B A cross-sectional view showing a portion of the stator according to an embodiment of the present disclosure;

[0039] Figure 13A For along Figure 12B Cross-sectional view of line C1-C1 in the middle;

[0040] Figure 13B For alongFigure 12B Cross-sectional view along line C2-C2;

[0041] Figure 13C To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 12B Cross-sectional view along line C3-C3;

[0042] Figure 14A To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure;

[0043] Figure 14B Cross-sectional view of a portion of a stator according to embodiments of the present disclosure,

[0044] Figure 15A To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 14B Cross-sectional view along line D1-D1;

[0045] Figure 15B To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 14B Cross-sectional view along line D2-D2;

[0046] Figure 15C To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 14B Cross-sectional view along line D3-D3;

[0047] Figure 16A To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure;

[0048] Figure 16B Cross-sectional view of a portion of a stator according to embodiments of the present disclosure;

[0049] Figure 17A To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 16B Cross-sectional view along line E1-E1;

[0050] Figure 17B To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 16B Cross-sectional view along line E2-E2;

[0051] Figure 17C To show a portion of a stator and oil flowing through a flow path according to embodiments of the present disclosure; Figure 16B Cross-sectional view along line E3-E3;

[0052] Figure 18A To show a motor including a housing according to embodiments of the present disclosure;

[0053] Figure 18B To show Figure 18A A portion of a stator and oil flowing through a flow path between the housing and the stator core;

[0054] Figure 19A To show a slot portion of a stator according to embodiments of the present disclosure;

[0055] Figure 19B is a perspective view illustrating a portion of a stator according to an embodiment of the disclosure;

[0056] Figure 20A and Figure 20B is a view illustrating a slot portion of a stator according to an embodiment of the disclosure;

[0057] Figure 21A is a view illustrating a slot portion of a stator according to an embodiment of the disclosure;

[0058] Figure 21B is a perspective view illustrating a portion of a stator according to an embodiment of the disclosure; and

[0059] Figure 22A , Figure 22B and Figure 22C is a view illustrating a slot portion of a stator according to an embodiment of the disclosure. DETAILED DESCRIPTION

[0060] The specific structure and function descriptions described in the embodiments of the disclosure are merely exemplified for the purpose of explaining the embodiments of the concept of the disclosure, and the embodiments of the concept of the disclosure can be implemented in various forms. In addition, the disclosure should not be interpreted as being limited by the embodiments described in the disclosure, but should be understood to include all modifications, equivalents, or alternatives included in the spirit and technical scope thereof.

[0061] In the disclosure, terms such as "first" and "second" can be used to describe various components, but the components are not limited by the terms. The above terms are merely for the purpose of distinguishing one component from other components, for example, a first component can be referred to as a second component, and similarly, a second component can also be referred to as a first component, without departing from the scope of the rights of the concept according to the disclosure.

[0062] When the components, devices, elements, etc. of the disclosure are described as having a purpose or performing an operation, function, etc., the components, devices, or elements should be considered herein as "configured to" satisfy the purpose or perform the operation or function.

[0063] It should be understood that when one component is referred to as "combined with" or "connected to" another component, it can be directly combined or connected to the other component, but other components can even exist in the middle. On the other hand, when one component is referred to as "directly combined with" or "directly connected to" another component, it should be understood that no other components exist in the middle. Other expressions used to describe the relationship between each component, such as "between" and "directly between" or "adjacent" and "immediately adjacent", should be similarly interpreted.

[0064] In the present specification, the same reference numerals denote the same elements throughout the specification. Also, the terms used in the present disclosure are used to describe the embodiments, and are not intended to limit the present disclosure. In the present specification, the singular forms also include the plural forms unless the context specifically indicates otherwise. As used herein, "include" and / or "comprise" mean that the stated components, steps, operations, and / or elements are not exclusive to one or more other components, steps, operations, and / or elements.

[0065] The present disclosure is described in detail below with reference to the accompanying drawings.

[0066] As Figure 1 shown, according to one embodiment of the present disclosure, the electric motor 1 includes a stator 10 and a rotor 20. The rotor 20 can be disposed inside the stator 10. The rotor 20 is configured to be rotatable with respect to the stator 10. The rotor 20 can be rotated with respect to the stator 10 by electromagnetic interaction between the stator 10 and the rotor 20.

[0067] The stator 10 includes a stator core 12 and a coil 14. The coil 14 to which a current can be applied is wound on the stator core 12. The rotor 20 includes a rotor core 22 and a permanent magnet 24. The permanent magnet 24 can be mounted on the rotor core 22. In the illustrated embodiment, the permanent magnet 24 is depicted on the rotor 20, but an electromagnet can also be used.

[0068] As Figure 2 shown, grooves 112 are provided in the stator core 12. Specifically, teeth 212 are provided along the circumferential direction of the stator core 12. The grooves 112 can be defined by the teeth 212. The grooves 112 can be spaced apart from each other at a predetermined interval along the circumferential direction of the stator core 12.

[0069] In a conventional cooling structure of an electric motor, the stator winding is indirectly cooled by an external flow path or by contact with a refrigerant outside the stator, which limits the cooling of the stator core winding, which is the main heat generating component of the electric motor. In addition, AC loss increases due to the electric motor being designed to have a high speed. In particular, it is well known that AC loss is highest in the winding on the side of the air gap of the electric motor close to the rotor magnet. The conventional cooling structure cannot effectively remove the generated heat, which is particularly significant in the winding on the side of the air gap, which greatly limits the continuous output of the high-speed electric motor.

[0070] The present disclosure provides a cooling system of an electric motor including a cooling path that directly supplies cooling oil to the coil, thereby directly cooling the core of the stator and the winding on the side of the air gap.

[0071] As Figure 3As shown, according to one embodiment of the present disclosure, the stator core 12 includes a flow path 100. The flow path 100 can extend through the inside of the stator core 12. In one embodiment, the flow path 100 can extend in a substantially radial direction of the stator core 12.

[0072] According to one embodiment of the present disclosure, the flow path 100 can be in fluid communication with the slots 112. In one embodiment, the flow path 100 can be in communication with the slots 112 through a supply flow path 110, an extension flow path 120, and a connection flow path 130. Each of the slots 112 can be provided with an axial flow path 140 extending in an axial direction of the stator core 12.

[0073] Referring to Figure 4 , the flow path 100 can allow oil to flow therethrough. The oil flowing through the stator 10 can cool the motor 1. Specifically, the oil can be circulated by the pump 30, and can flow in a flow direction F1. After completing heat exchange with the heat exchanger 40, the oil can be supplied to the flow path 100 of the stator 10. The oil having completed cooling of the stator 10 is collected in the chamber 50 located at the bottom of the stator 10 by gravity. The oil collected in the chamber 50 can be recirculated by the pump 30.

[0074] As shown in Figure 5 and Figure 6 , the supply flow path 110 can extend in a circumferential direction of the stator core 12. In one embodiment, the supply flow path 110 can be recessed in the stator core 12. The oil supplied to the supply flow path 110 can flow through the extension flow path 120. The extension flow path 120 can extend along the inside of the stator core 12. The oil flowing along the extension flow path 120 can be supplied to the axial flow path 140 to directly cool the coil 14.

[0075] According to one embodiment of the present disclosure, the supply flow path 110 at the stator core 12 can be provided at a central portion of an axial length of the stator core 12. The supply flow path 110 can thereby allow the oil to uniformly flow through the axial flow path 140 to opposite sides with respect to the supply flow path 110. However, the supply flow path 110 can also be provided at another portion of the stator core 12.

[0076] In one embodiment, the stator core 12 is a laminated core made by laminating (e.g., stacking) a plurality of electrical steel plates. In one embodiment, the stator core 12 can be manufactured by laminating at least two steel plates having different shapes. According to the present disclosure, since the flow path 100 is formed by laminating at least two steel plates having different shapes, an additional structure for forming the flow path 100 can be omitted. With this configuration, a greater cooling area is ensured, and a loss of electromagnetic performance is reduced.

[0077] Referring to Figure 7A andFigure 7B In one embodiment, the portion of the stator core 12 excluding the supply flow path 110 may be made from a single piece of steel plate, such as... Figure 7A As shown. Furthermore, in the portion of the stator including the supply flow path 110, the flow path 100 can be formed by separate steel plates, such as... Figure 7B As shown.

[0078] Through this type of structure, oil is supplied to the stator core 12 via supply flow path 110, such as... Figure 8A and Figure 8B As shown. Then, the oil can be guided to the axial flow path 140 in the tank 112 by sequentially passing through the extended flow path 120 and the connecting flow path 130 along the flow direction F1.

[0079] In one embodiment, the flow path 100 can be stacked differently from... Figure 6 Various shapes of steel plates are formed in the embodiments shown.

[0080] like Figure 9A and Figure 9B As shown, the supply flow path 110 may have a stepped path. Oil flowing through the stepped flow path 100 can be supplied to the axial flow path 140 within the tank 112 via the connecting flow path 130 (see...). Figure 9C ).

[0081] This type of structure can improve the manufacturability of the stator core 12. For example... Figure 10 As shown, the stator core 12 can be divided into multiple sections, and can be as follows: Figure 11A and Figure 11D The portion of the stator core 12 shown does not have the flow path 100. The portion of the stator core 12 that forms the flow path 100 on its surface can be formed using steel plates with cross-sectional shapes that differ from each other (see [reference]). Figure 11B and Figure 11C Specifically, in steel sheets that are in direct contact with steel sheets containing portions of the non-flow path 100, an L-shaped flow path 100 is provided. This improves the ease of steel sheet manufacturing by preventing the formation of separate sheets and minimizes the deterioration of electromagnetic properties.

[0082] like Figure 12A and Figure 12B As shown, the supply flow path 110 can be H-shaped, which can limit the required steel plate types to three to reduce production processes and costs. For example, it can use... Figures 13A to 13CThe three types of steel sheets shown provide the flow path 100. By minimizing the types of steel sheets, the increase in molds due to the diversification of the steel sheets can be minimized, and the number of processes can be reduced. Furthermore, since the number of layers of base steel sheets can be increased, deterioration of electromagnetic performance can be reduced or minimized.

[0083] As shown in Figure 14A and Figure 14B , the supply flow path 110 can be Y-shaped. This shape of the flow path 100 can reduce the types of steel sheets required to three, thereby simplifying the production process and reducing costs. Furthermore, since the shape of each steel sheet is simple, it is easy to manufacture. For example, the flow path 100 can be formed by three types of steel sheets shown in Figures 15A to 15C By minimizing the types of steel sheets, the number of molds and processes can be reduced. Furthermore, since the shape of each steel sheet can be simplified, the ease of manufacturing can be improved. Furthermore, from a performance perspective, since the number of layers of base steel sheets can be increased, deterioration of electromagnetic performance can be reduced or minimized.

[0084] As shown in Figure 16A and Figure 16B , the supply flow path 110 can be N-shaped, which can reduce the types of steel sheets required to three, thereby simplifying the production process and reducing costs. Furthermore, since the number of layers of electrical steel sheets used in the flow path 100 is reduced, electromagnetic performance can be minimized. For example, the flow path 100 can be provided by three types of steel sheets shown in Figures 17A to 17C By minimizing the types of steel sheets, the number of molds and processes can be reduced. Furthermore, since the shape of each steel sheet can be simplified, the ease of manufacturing can be improved. Furthermore, from a performance perspective, the number of layers of base steel sheets used as the basis of the stator core 12 (e.g., electrical steel sheets having a cross-section as shown in Figure 17A ) can be increased, so that deterioration of electromagnetic performance can be reduced or minimized.

[0085] Referring to Figure 18A , a motor cooling structure according to the present disclosure can include a housing 60. A flow path, i.e., a supply flow path 110, that flows along the outer periphery of the stator 10 to distribute oil to each slot 112 of the stator core 12. As shown in Figure 18B , according to one embodiment of the present disclosure, the supply flow path 110 can be defined by the housing 60 and the stator core 12. Oil can flow through the supply flow path 110 recessed in the housing 60.

[0086] In one embodiment, the housing 60 can be press-fitted into the stator core 12. This can improve manufacturability, such as tolerance management, etc., by keeping the outer diameter of the steel sheets constituting the stator core 12 constant. Furthermore, the impact on the electromagnetic performance of the motor 1 including the supply flow path 110 can also be reduced.

[0087] As Figure 19A and Figure 19B shown, according to the present disclosure, a cooling structure of the motor can include a gutter 200. The gutter 200 can prevent oil leakage due to the opening of the slot 112. In other words, the gutter 200 can prevent oil from flowing into the air gap between the stator 10 and the rotor 20, thereby reducing or minimizing the resistance loss caused by the oil.

[0088] As Figure 19B shown, the gutter 200 can be inserted and placed within the slot 112. In some embodiments, the gutter 200 can be provided within at least one slot 112 or within each of a plurality of slots to retain oil inside the slot. The upper part of the gutter 200 is open so that the oil and the coil 14 are in direct contact, which can maximize the cooling effect. When oil leaks into the gap, it can cause resistance to the rotation of the motor, thereby causing problems such as power loss and heat generation. However, according to the present disclosure, the above-mentioned problems can be solved by introducing the gutter 200.

[0089] According to one embodiment of the present disclosure, the gutter 200 can include an insulation paper 26. As Figure 20A shown, by folding the insulation paper 26 around the outside of the coil 14, oil leakage can be avoided or prevented. This structure can prevent oil from leaking into the axial flow path 140 without the need to insert an additional structure. Since the insulation paper 26 used in the motor 1 is mainly made of a thin processed plastic material, it can be effectively used as a structure through which a liquid flows. In one embodiment, the insulation paper 26 is manufactured to be larger than the coil 14, so that the space of the lower part of the slot 112 can be used as the axial flow path 140.

[0090] As Figure 20B shown, according to some embodiments of the present disclosure, the gutter 200 can be a separate structure. When the gutter 200 is a separate structure, it can be attached by being manufactured in a shape corresponding to the shape of the opening in the slot 112. This can provide a structure that prevents oil leakage regardless of the shape of the opening of the slot 112. In one example, the gutter 200 can be made of a non-magnetic material such as plastic.

[0091] As Figure 21A shown, in one embodiment, the gutter 200 can be a separate structure. Such a gutter 200 can fix the coil 14 at the upper part of the gutter 200, function as a flow path 100, and prevent oil leakage. As in the illustrated embodiment, a plurality of holes can be formed at the top of the gutter 200.

[0092] As Figure 22A , Figure 22B and Figure 22CAs illustrated, a gap G can be provided between the windings of the coil 14. The gap G can be formed between the windings of the coil 14 during the design of the stator 10, and the gap G can serve as the axial flow path 140. As in the illustrated embodiment, the insulation paper 26 and the coil 14 are tightly fitted within the slot 112. In view of this, not only can oil leakage be prevented, but a flow path 100 can be created at a desired location, thereby improving cooling capacity.

[0093] The motor cooling structure according to the present disclosure can effectively remove heat generated in deep parts and air gap side windings of a motor, which is not sufficient in a conventional cooling system.

[0094] The motor cooling structure according to the present disclosure provides a cooling path that can directly cool a coil lower part to eliminate heat concentrated on a coil upper part near a motor air gap. With the axial flow path directly passing through a slot, cooling performance of deep parts of a coil and a stator steel plate can be improved. Accordingly, as the cooling performance is improved, continuous output can also be improved. In addition, power efficiency can also be improved because a temperature rise in a coil can be prevented.

[0095] In addition, the motor cooling structure according to the present disclosure can improve efficiency of a motor. Because the resistance of a coil is proportional to temperature, the present disclosure can lower the temperature of a coil by directly cooling the coil, thereby maintaining low resistance. According to Ohm's law, low resistance reduces copper loss, and can ultimately improve the efficiency of a motor.

[0096] The motor cooling structure according to the present disclosure can enable a motor to be slimmed. According to the present disclosure, a compact space for electrical components in a vehicle can be achieved, air dynamics and fuel efficiency can be improved by lowering a hood of a vehicle, a seat of a vehicle can be moved forward, an interior space of a vehicle can be increased, protrusion caused by an installation angle of electrical components can be reduced, and a cargo space of a cargo vehicle can be increased.

[0097] The above-described present disclosure is not limited to the above-described embodiments and drawings, and it will be obvious to those skilled in the art that various substitutions, modifications and changes are possible without departing from the technical spirit of the present disclosure.

Claims

1. A stator, comprising: Stator core; as well as coil, The stator core includes: Teeth, wherein the coil is wound around the teeth; Multiple slots separated by the teeth; and A flow path configured to pass through the outer periphery of the stator core and communicate with the plurality of slots, and to supply oil through the flow path.

2. The stator according to claim 1, wherein the flow path comprises: A supply flow path is formed along the circumferential direction on the outer periphery of the stator core.

3. The stator according to claim 2, wherein the flow path further comprises: The extended flow path extends from the supply flow path in the radially inward direction of the stator core.

4. The stator according to claim 3, wherein the flow path further comprises: An axial flow path is configured to communicate with the extended flow path and is arranged within the plurality of slots.

5. The stator according to claim 4, further comprising: A connecting flow path is configured to connect the extended flow path and the axial flow path.

6. The stator according to claim 1, further comprising: A groove is provided in at least one of the plurality of grooves and is configured to retain the oil in the at least one groove.

7. The stator of claim 6, wherein the groove is an insulating paper configured to wrap the coil.

8. The stator according to claim 6, wherein the groove comprises: Multiple holes are formed in the upper part of the trench.

9. The stator according to claim 1, wherein the stator core is a laminated core having multiple electrical steel plates stacked on top of each other, and The flow path is formed by at least two electrical steel plates with different cross-sectional shapes among the plurality of electrical steel plates.

10. A cooling system for an electric motor, the cooling system comprising: stator; An oil chamber is located at the lower part of the stator; A pump configured to direct oil from the oil chamber to the flow path of the stator; as well as A heat exchanger configured to exchange heat with the oil. The stator includes: Stator core; and coil, The stator core includes: Teeth, wherein the coil is wound around the teeth; Multiple slots separated by the teeth; and A flow path is configured to pass through the stator core from the outer periphery of the stator core and communicate with the plurality of slots, and to supply oil through the flow path.

11. An electric motor, comprising: The stator, which includes the stator core and coils; as well as The rotor is configured to rotate relative to the stator. The stator core includes: Teeth, wherein the coil is wound around the teeth; Multiple slots separated by the teeth; and A flow path is configured to pass through the stator core from the outer periphery of the stator core and communicate with the plurality of slots, and to supply oil through the flow path.

12. The motor according to claim 11, wherein the flow path comprises: A supply flow path is formed along the circumferential direction on the outer periphery of the stator core.

13. The motor according to claim 12, wherein the flow path further comprises: The extended flow path extends from the supply flow path in the radially inward direction of the stator core.

14. The motor according to claim 13, wherein the flow path further comprises: An axial flow path is configured to communicate with the extended flow path and is arranged within the plurality of slots.

15. The motor according to claim 14, further comprising: The air gap is provided between the stator and the rotor. The axial flow path is formed near the air gap.

16. The motor according to claim 11, further comprising: A groove is arranged in at least one of the plurality of grooves and configured to retain the oil in the at least one groove.

17. The motor of claim 16, wherein the groove is an insulating paper configured to wrap the coil.

18. The motor of claim 16, wherein the groove comprises: Multiple holes are formed in the upper part of the trench.

19. The motor according to claim 11, wherein the stator core is a laminated core having multiple electrical steel plates stacked on top of each other, and The flow path is provided by at least two electrical steel plates with different cross-sectional shapes among the plurality of electrical steel plates.

20. A vehicle comprising: An electric motor, the electric motor including a stator and a rotor configured to rotate relative to the stator, wherein the stator includes a stator core and coils, and The stator core includes: Teeth, wherein the coil is wound around the teeth; Multiple slots separated by the teeth; and A flow path is configured to pass through the stator core from the outer periphery of the stator core and communicate with the plurality of slots, and to supply oil through the flow path.

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