In-slot cooling stator and in-slot cooling motor

Abstract

The invention relates to an in-slot cooling stator and an in-slot cooling motor. The in-slot cooling stator comprises a stator iron core which is of a hollow annular structure, a plurality of uniformly distributed stator slots are formed in the stator iron core, the stator iron core comprises an oil guide plate, a cooling channel is arranged on the oil guide plate, and the cooling channel is communicated with the stator slots of the oil guide plate; the stator winding is embedded in the stator grooves, the stator winding comprises a plurality of winding wires, and each winding wire is embedded in one stator groove; and the slot insulation paper is embedded in each stator slot, and the slot insulation paper is arranged between the inner wall of the stator slot and the winding wire. The efficiency of the whole cooling system can be improved by using the oil guide plate, the problem that a cooling passage in the stator is blocked in the assembly process is effectively avoided by using the slot insulation paper, the insulation performance of the winding is also ensured, and the cooling oil smoothly flows through the cooling passage and the stator slot which are communicated, so that the cooling efficiency is improved. Heat exchange with the interior of the stator is carried out to take away a large amount of heat.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an in-slot cooling stator and an in-slot cooling motor. Background Art

[0002] With the rapid development of new energy technologies, the power density requirements of electric motors in various applications have increased significantly, and the cooling requirements have become more urgent. High-power-density electric motors generate a lot of heat during operation. If the heat cannot be effectively dissipated, the excessive temperature will not only reduce the performance of the motor, but may also cause component aging and shortened service life. Especially in the fields of electric vehicles, industrial automation, etc., the high efficiency and high reliability of electric motors are the key to their successful application. Therefore, the development of efficient cooling solutions has become an important research topic to improve the performance of electric motors and ensure their stable operation.

[0003] In the related art, cooling channels are generally arranged on the stator core to improve the heat dissipation capacity of the motor. These channels are usually water-cooled or oil-cooled, and the coolant flows through the cooling channels to remove the heat generated by the motor during operation. Common designs include setting cooling channels in the stator slots or in the stator housing to reduce the temperature by the flow of coolant.

[0004] However, in the related art, when the cooling channel is arranged in the stator slot, the resistance and eddy current of the coolant flow will lead to poor cooling effect, especially the arrangement of the copper wire in the slot will affect the flow path of the coolant. In addition, the cooling channel may be affected by the casting, thereby reducing its cooling capacity and causing the motor to run at a higher temperature. Summary of the invention

[0005] Based on this, it is necessary to provide a slot-cooled stator and a slot-cooled motor to address the problem of reduced stator cooling performance due to castings.

[0006] In a first aspect, the present application provides a slot-cooling stator. The slot-cooling stator comprises:

[0007] The stator core is a hollow ring structure, the stator core is provided with a plurality of evenly distributed stator slots, the stator core comprises an oil guide plate, the oil guide plate is provided with a cooling channel, and the cooling channel is communicated with the stator slots of the oil guide plate;

[0008] A stator winding, wherein the stator winding is embedded in the stator slot, the stator winding comprises a plurality of winding wires, and each winding wire is respectively embedded in one of the stator slots;

[0009] Slot insulation paper, each of the stator slots is embedded with the slot insulation paper, and the slot insulation paper is arranged between the slot inner wall of the stator slot and the winding wire.

[0010] In one of the embodiments, a protrusion is provided on the side wall of the stator slot, and the protrusion divides the stator slot into an upper stator slot and a lower stator slot. The upper stator slot and the lower stator slot are both provided with the slot insulation paper, and a winding wire is respectively embedded in the upper stator slot and the lower stator slot, and an intra-slot oil circuit is formed between the upper stator slot and the lower stator slot.

[0011] In one embodiment, the cooling passage includes a first oil groove and a second oil groove, the first oil groove is arranged along the radial direction of the oil guide plate, the first end of the second oil groove is connected to the inner end of the first oil groove, and the second end of the second oil groove is connected to the oil circuit in the groove of the oil guide plate.

[0012] In one embodiment, the length of the first oil groove is a first preset length, and the distance from the oil path in the groove to the outer ring of the oil guide plate is the first preset length.

[0013] In one of the embodiments, the stator core further comprises a core body, and one of the stator cores is disposed on both sides of the oil guide plate, respectively, and the oil path in the slot of the oil guide plate is connected to the oil path in the slot of the core body.

[0014] In one embodiment, the core body and the oil guide plate are both hollow annular structures, the outer diameter of the core body is larger than the outer diameter of the oil guide plate, and the core body and the oil guide plate are stacked and connected to form an annular oil circuit, and the annular oil circuit is connected to the cooling passage of the oil guide plate.

[0015] In one embodiment, a plurality of cooling oil holes are formed on the core body, the distance between the cooling oil holes and the axis of the core body is greater than the outer diameter of the oil guide plate, and the cooling oil holes are connected to the annular oil passage.

[0016] In one of the embodiments, the axial length of the slot insulation paper is greater than the axial length of the stator core.

[0017] In one of the embodiments, the slot insulation paper is made of thermal expansion material;

[0018] After the slot insulation paper is heated, the slot insulation paper fills the gap between the slot insulation paper and the winding wire and the slot insulation paper and the stator core.

[0019] In a second aspect, the present application provides an in-slot cooling motor, which includes the in-slot cooling stator described in any of the above embodiments.

[0020] The above-mentioned slot-cooled stator and slot-cooled motor add an oil guide plate structure in the stator core of the stator. The introduction of the oil guide plate further improves the efficiency of the entire cooling system. The stator core is provided with stator slots, in which stator windings and slot insulation paper are placed. The slot insulation paper effectively avoids the problem of blockage of the internal cooling passages of the stator during assembly, and also ensures the insulation performance of the windings. The cooling channels provided in the oil guide plate are directly connected to the stator slots, so that the flowing cooling oil can smoothly pass through these channels, thereby minimizing the gap between the windings and the cooling medium, and further optimizing the heat conduction inside the stator, so that the cooling oil can quickly take away the heat inside the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a slot-cooled stator provided in one embodiment of the present application;

[0022] FIG2 is a schematic diagram of the cross-sectional structure of an oil guide plate provided in one embodiment of the present application;

[0023] FIG3 is a partial enlarged schematic diagram of the oil guide plate in FIG2 ;

[0024] FIG4 is a schematic diagram of the structure of the oil circuit in the tank provided by an embodiment of the present application;

[0025] FIG5 is a schematic structural diagram of a stator core provided in an embodiment of the present application;

[0026] FIG6 is a schematic diagram of a cross-sectional structure of an iron core body provided in an embodiment of the present application;

[0027] FIG7 is a partial enlarged schematic diagram of the core body in FIG6 ;

[0028] FIG8 is a schematic diagram of a cooling oil flow path according to an embodiment of the present application;

[0029] FIG. 9 is a second schematic diagram of the structure of the cooling oil flow path provided in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 10-winding, 20-slot insulation paper, 30-stator core;

[0032] 110-winding wire;

[0033] 310- iron core body, 320- oil guide plate, 330- annular oil circuit, 340- stator slot;

[0034] 311-Cooling oil hole;

[0035] 321 - cooling passage, 322 - first oil groove, 323 - second oil groove;

[0036] 341 - upper stator slot, 342 - lower stator slot. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] Motor cooling technology is a key factor in ensuring the high performance and high efficiency of the motor. At present, the three main methods are air cooling, water cooling and oil cooling. Air cooling is gradually being eliminated due to its poor cooling effect, and water cooling and oil cooling have become more widely used. The water cooling system performs well in high-power and high-speed motors and can effectively control the temperature. The principle is to adjust the water flow through the throttle valve to ensure that the oil is efficiently lubricated within the optimal temperature range. However, the disadvantages of the water cooling system cannot be ignored, including high cost, complex structure and high failure rate. In addition, the external water tank takes up space, which limits its application in some compact motors. In comparison, the oil cooling system shows higher efficiency and stability in heat dissipation. Oil cooling technology can reduce the high-temperature viscosity of the oil, thereby reducing failures caused by high temperature. Although the oil cooling system has a lower failure rate and better cooling effect, most oil-cooled motors currently still use external spraying to cool the stator. This method does not fully utilize the structure of the stator interior and side wall for direct cooling, resulting in poor overall cooling effect. This limitation makes it difficult to meet the heat dissipation needs of the motor under high load and high temperature conditions. Based on this, the inventors have improved the stator cooling method of the oil-cooled motor to improve the stator cooling performance.

[0044] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of the slot-cooled stator in an embodiment of the present application, and the slot-cooled stator includes a stator core 30, a stator winding 10 and a slot insulating paper 20. The stator core 30 is a hollow annular structure, and the stator core 30 is provided with a stator slot 340, and the stator slot 340 is arranged close to the inner ring of the stator core 30. The winding wire 110 of the stator winding 10 and the slot insulating paper 20 are embedded in each stator slot 340, and the slot insulating paper 20 is arranged between the inner wall of each stator slot 340 and the winding wire 110 embedded in the stator slot 340. In some embodiments, the slot insulating paper 20 is made of thermal expansion material. After the stator assembly is completed, the stator assembly is heated, and the slot insulating paper 20 fills the gap between the slot insulating paper 20 and the slot winding 10 and the gap between the slot insulating paper 20 and the stator core 30 after being heated.

[0045] The axial length of the slot insulation paper 20 is greater than the axial length of the stator core 30 .

[0046] The stator core 30 includes an oil guide plate 320, on which stator slots 340 are disposed, and cooling channels are disposed on the oil guide plate 320. The number of cooling channels is equal to the number of stator slots 340, and each cooling channel is communicated with one stator slot 340 respectively.

[0047] The above-mentioned slot-cooled stator and slot-cooled motor add an oil guide plate 320 structure in the stator core 30 of the stator. The introduction of the oil guide plate 320 further improves the efficiency of the entire cooling system. The stator core 30 is provided with a stator slot 340, in which the stator winding 10 and slot insulation paper 20 are placed. The slot insulation paper 20 effectively avoids the problem of the internal cooling passage 321 of the stator being blocked during the assembly process, and also ensures the insulation performance of the winding 10. The cooling channel provided in the oil guide plate 320 is directly connected to the stator slot 340, so that the flowing cooling oil can smoothly pass through these channels, thereby minimizing the interval between the winding 10 and the cooling medium, thereby optimizing the heat conduction inside the stator, so that the cooling oil can quickly take away the heat inside the stator.

[0048] Referring to Fig. 2 and Fig. 3, Fig. 2 shows a schematic cross-sectional structure diagram of an oil guide plate 320 provided in an embodiment of the present application, and Fig. 3 is a partially enlarged schematic diagram of the oil guide plate 320 in Fig. 2. The cooling passage 321 of the oil guide plate 320 includes a first oil groove 322 and a second oil groove 323, wherein the first oil groove 322 is arranged along the radial direction of the oil guide plate 320, the first end of the second oil groove 323 is connected to the inner end of the first oil groove 322, and the second end of the second oil groove 323 is connected to the stator groove 340.

[0049] Continuing to refer to FIG. 2 and FIG. 3 , the side wall of the stator slot 340 is provided with a protrusion, which divides the stator slot 340 into an upper stator slot 341 and a lower stator slot 342. The upper stator slot 341 and the lower stator slot 342 are both embedded with winding wires 110, and a slot insulation paper 20 is provided between the slot inner wall of each upper stator slot 341 (or lower stator slot 342) and the winding wire 110 embedded in the upper stator slot 341 (or lower stator slot 342). The slot insulation paper 20 in the upper stator slot 341, the slot insulation paper 20 in the lower stator slot 342, and the protrusion on the side wall of the stator slot 340 form a through hole, i.e., an oil path in the slot, which is connected to the cooling passage 321.

[0050] The cooling passage 321 formed by connecting the first oil groove 322 and the second oil groove 323 is an L-shaped structure. The length of the first oil groove 322 is a first preset length, and the distance from the oil path in the groove to the outer ring of the oil guide plate 320 is the first preset length. The first preset length is determined by simulation experiments. In one embodiment, the first preset length can be half of the radial thickness of the oil guide plate 320. The length of the first oil groove 322 is the first preset length, and the distance from the oil path in the groove to the outer ring of the oil guide plate 320 is the first preset length.

[0051] In this embodiment, a protrusion is provided on the side wall of the stator slot 340 and the stator slot 340 is divided into two upper and lower parts by using the protrusion, thereby enhancing the stability of the slot body and avoiding damage caused by vibration generated during the operation of the motor; the provision of the slot insulating paper 20 effectively prevents short circuits between the winding wires 110 and between the inner wall of the stator slot 340, reduces the risk of leakage, and at the same time, through the provision of the in-slot oil circuit, which is connected to the cooling passage 321, it can effectively guide the flow of coolant and enhance the heat dissipation capacity of the motor.

[0052] Referring to FIG5 , FIG5 shows a schematic diagram of the structure of a stator core 30 provided in an embodiment of the present application, wherein the stator core 30 includes two core bodies 310, the two core bodies 310 are stacked with an oil guide plate 320, and one core body 310 is respectively arranged on both sides of the oil guide plate 320. Referring to FIG6 and FIG7 , FIG6 shows a schematic diagram of the cross-sectional structure of the core body 310 provided in an embodiment of the present application, and FIG7 shows a partial enlarged schematic diagram of the core body 310 in FIG6 , wherein the core body 310 is provided with a plurality of evenly distributed stator slots 340, and the number and size of the stator slots 340 of the core body 310 and the stator slots 340 of the oil guide plate 320 are the same.

[0053] Continuing to refer to FIG. 5 to FIG. 7 , the stator slot 340 on each core body 310 is connected to the stator slot 340 of the oil guide plate 320, that is, the oil path in the slot on each core body 310 is connected to the oil path in the slot of the oil guide plate 320. The core body 310 and the oil guide plate 320 are both hollow annular structures, the inner diameter of the core body 310 is the same as the inner diameter of the oil guide plate 320, and the outer diameter of the core body 310 is larger than the outer diameter of the oil guide plate 320. After the two core bodies 310 clamp the oil guide plate 320 and are stacked and assembled, the outer ring parts of the two core bodies 310 and the outer ring parts of the oil guide plate 320 form an annular groove, which is an annular oil path 330, and the annular oil path 330 is connected to the cooling passage 321 of the oil guide plate 320.

[0054] Continuing to refer to FIG. 6 and FIG. 7 , the core body 310 is provided with a plurality of cooling oil holes 311, the number of the cooling oil holes 311 being equal to the number of the stator slots 340 on the core body 310, and each cooling oil hole 311 being respectively disposed at the outer end of a stator slot 340. The distance between the cooling oil hole 311 and the center line of the core body 310 is greater than the outer diameter of the oil guide plate 320, that is, the cooling oil hole 311 is connected to the annular oil path 330.

[0055] In this embodiment, the stacking design of the core body 310 and the oil guide plate 320 forms an annular oil circuit 330, which helps to enhance the stability of the overall structure, while providing a good oil circuit layout so that the coolant can flow smoothly; since the stator slots 340 and the cooling oil holes 311 are the same in number and evenly distributed, the consistency of the cooling effect is ensured, which helps to avoid performance degradation or damage due to local overheating.

[0056] In an exemplary embodiment, the present application provides a slot-cooled stator, which includes a stator core 30, a stator winding 10 and a slot insulating paper 20. The stator core 30 is a hollow annular structure, and the stator core 30 is provided with a stator slot 340, and the stator slot 340 is arranged close to the inner ring of the stator core 30. Each stator slot 340 is embedded with a winding wire 110 of the stator winding 10 and a slot insulating paper 20, and the slot insulating paper 20 is arranged between the inner wall of each stator slot 340 and the winding wire 110 embedded in the stator slot 340. Among them, the slot insulating paper 20 is made of thermal expansion material. After the stator assembly is completed, the stator assembly is heated, and the slot insulating paper 20 fills the gap between the slot insulating paper 20 and the winding 10 in the slot and the gap between the slot insulating paper 20 and the stator core 30 after being heated, and the length of the slot insulating paper 20 in the axial direction is greater than the length of the stator core 30 in the axial direction.

[0057] The stator core 30 includes a core body 310 and an oil guide plate 320. The core body 310 is provided with two, and both the core body 310 and the oil guide plate 320 are hollow annular structures. The oil guide plate 320 and the core body 310 are provided with a number of evenly distributed stator slots 340, and the number and size of the stator slots 340 of the core body 310 and the stator slots 340 of the oil guide plate 320 are the same. At the same time, the oil guide plate 320 is also provided with cooling channels, the number of cooling channels is equal to the number of stator slots 340, and each cooling channel is connected to a stator slot 340. The cooling passage 321 of the oil guide plate 320 includes a first oil groove 322 and a second oil groove 323, the first oil groove 322 is arranged along the radial direction of the oil guide plate 320, the first end of the second oil groove 323 is connected to the inner end of the first oil groove 322, and the second end of the second oil groove 323 is connected to the stator slot 340. The cooling passage 321 formed by connecting the first oil groove 322 and the second oil groove 323 is an L-shaped structure, the length of the first oil groove 322 is a first preset length, and the distance from the oil path in the groove to the outer ring of the oil guide plate 320 is the first preset length. The first preset length is determined by simulation experiments. For example, the first preset length is set to half of the radial length of the oil guide plate 320.

[0058] The core body 310 is also provided with a plurality of cooling oil holes 311, the number of which is equal to the number of the stator slots 340 on the core body 310, and each cooling oil hole 311 is respectively arranged at the outer end of a stator slot 340. The distance between the cooling oil hole 311 and the center line of the core body 310 is greater than the outer diameter of the oil guide plate 320, that is, the cooling oil hole 311 is connected to the annular oil path 330.

[0059] The side walls of the stator slot 340 in the oil guide plate 320 and the side walls of the stator slot 340 in the core body 310 are both provided with protrusions, which divide the stator slot 340 into an upper stator slot 341 and a lower stator slot 342. The upper stator slot 341 and the lower stator slot 342 are both embedded with winding wires 110, and slot insulation paper 20 is provided between the inner wall of each upper stator slot 341 (or lower stator slot 342) and the winding wire 110 embedded in the upper stator slot 341 (or lower stator slot 342), and the slot insulation paper 20 in the upper stator slot 341, the slot insulation paper 20 in the lower stator slot 342 and the protrusions on the side walls of the stator slot 340 form a through hole, i.e., an oil path in the slot. And the oil path in the slot of the oil guide plate 320 is connected to the cooling passage 321.

[0060] After the two core bodies 310 clamp the oil guide plate 320 and are stacked and assembled, the stator slots 340 on each core body 310 are connected to the stator slots 340 of the oil guide plate 320, that is, the oil path in the slot on each core body 310 is connected to the oil path in the slot of the oil guide plate 320. Since the inner diameter of the core body 310 is the same as the inner diameter of the oil guide plate 320 and the outer diameter of the core body 310 is larger than the outer diameter of the oil guide plate 320, the outer ring parts of the two core bodies 310 and the outer ring parts of the oil guide plate 320 form an annular groove, which is set as an annular oil path 330, and the annular oil path 330 is connected to the cooling passage 321 of the oil guide plate 320.

[0061] When the stator is cooled by cooling oil, the cooling oil first enters the annular oil circuit 330, and enters the core body 310 and the oil guide plate 320 from the radial direction and the axial direction respectively through the cooling oil hole 311 and the cooling channel connected to the annular oil circuit 330. The cooling oil entering the cooling oil hole 311 of the core body 310 from the radial direction exchanges heat with the outer ring part of the core body 310, thereby reducing the temperature of the outer ring part of the core body 310. The cooling oil entering the cooling channel of the oil guide plate 320 from the axial direction flows to the oil circuit in the slot of the oil guide plate 320, and then flows to the oil circuit in the slot of the core body 310 connected to the oil circuit in the slot of the oil guide plate 320, and then exchanges heat with the slot insulation paper 20 wrapped with the winding wire 110 and the convex block on the side wall of the stator slot 340, thereby reducing the temperature of the area near the slot insulation paper 20 wrapped with the winding wire 110 and the convex block on the side wall of the stator slot 340. The above-mentioned specific cooling oil circuit is shown in Figures 8 and 9.

[0062] In this embodiment, by introducing the oil guide plate 320 structure in the stator core 30, the efficiency of the cooling system is significantly improved. The stator winding 10 and the slot insulation paper 20 are reasonably arranged in the stator slot 340, ensuring the insulation performance of the winding 10 and avoiding the blockage of the cooling passage 321 during the assembly process. The cooling channel of the oil guide plate 320 is directly connected to the stator slot 340, which enables the cooling oil to flow smoothly, greatly reduces the interval between the winding 10 and the cooling medium, effectively optimizes the heat conduction, and quickly takes away the heat inside the stator. The convex block set on the side wall of the stator slot 340 further enhances the stability of the slot body and prevents damage caused by vibration generated during the operation of the motor. At the same time, the slot insulation paper 20 effectively prevents the short circuit phenomenon between the winding wire 110 and the inner wall of the stator slot 340, reducing the risk of leakage. Combined with the design of the oil circuit in the slot and the cooling passage 321, the fluidity of the coolant is enhanced, thereby improving the heat dissipation capacity of the motor. The stacking design of the core body 310 and the oil guide plate 320 forms an annular oil circuit 330, which not only improves the stability of the overall structure, but also optimizes the oil circuit layout so that the coolant can flow smoothly. The uniform distribution of the number of stator slots 340 and cooling oil holes 311 ensures the consistency of the cooling effect and avoids local overheating.

[0063] In some embodiments, the present application provides an in-slot cooled motor, which includes the in-slot cooled stator described in any of the above embodiments.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A slot-cooled stator, characterized in that: include: The stator core is a hollow ring structure, the stator core is provided with a plurality of evenly distributed stator slots, the stator core comprises an oil guide plate, the oil guide plate is provided with a cooling channel, and the cooling channel is communicated with the stator slots of the oil guide plate; A stator winding, wherein the stator winding is embedded in the stator slot, the stator winding comprises a plurality of winding wires, and each winding wire is respectively embedded in one of the stator slots; Slot insulation paper, each of the stator slots is embedded with the slot insulation paper, and the slot insulation paper is arranged between the slot inner wall of the stator slot and the winding wire.

2. The slot-cooled stator according to claim 1, characterized in that: The side wall of the stator slot is provided with a protrusion, and the protrusion divides the stator slot into an upper stator slot and a lower stator slot. The upper stator slot and the lower stator slot are both provided with the slot insulation paper, and a winding wire is embedded in the upper stator slot and the lower stator slot respectively, and an intra-slot oil circuit is formed between the upper stator slot and the lower stator slot.

3. The slot-cooled stator according to claim 2, characterized in that: The cooling passage includes a first oil groove and a second oil groove, wherein the first oil groove is arranged along the radial direction of the oil guide plate, the first end of the second oil groove is connected to the inner end of the first oil groove, and the second end of the second oil groove is connected to the oil path in the groove of the oil guide plate.

4. The slot-cooled stator according to claim 3, characterized in that: The length of the first oil groove is a first preset length, and the distance from the oil path in the groove to the outer ring of the oil guide plate is the first preset length.

5. The slot-cooled stator according to claim 2, characterized in that: The stator core also includes a core body. One stator core is respectively arranged on both sides of the oil guide plate. The oil path in the slot of the oil guide plate is connected with the oil path in the slot of the core body.

6. The slot-cooled stator according to claim 5, characterized in that: The core body and the oil guide plate are both hollow annular structures. The outer diameter of the core body is larger than the outer diameter of the oil guide plate. The core body and the oil guide plate are stacked and connected to form an annular oil circuit, which is connected to the cooling passage of the oil guide plate.

7. The slot-cooled stator according to claim 6, characterized in that: The core body is provided with a plurality of cooling oil holes, the distance between the cooling oil holes and the axis of the core body is greater than the outer diameter of the oil guide plate, and the cooling oil holes are connected with the annular oil passage.

8. The slot-cooled stator according to claim 1, characterized in that: The axial length of the slot insulation paper is greater than the axial length of the stator core.

9. The slot-cooled stator according to claim 1, characterized in that: The slot insulation paper is made of thermal expansion material; After the slot insulation paper is heated, the slot insulation paper fills the gap between the slot insulation paper and the winding wire and the slot insulation paper and the stator core.

10. An in-slot cooling motor, characterized in that: The invention comprises the slot-cooled stator as claimed in any one of claims 1 to 9.

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