Notch liquid cooling structure of flat wire motor stator

Abstract

The invention relates to the technical field, provides a notch liquid cooling structure of a flat wire motor stator, and realizes high-efficiency and low-consumption motor stator cooling through an accurately-positioned full-coverage liquid cooling structure. In order to achieve the purpose, the motor comprises a stator iron core, closed iron core wire grooves are evenly distributed in the inner edge of the stator iron core, wires forming windings are inserted in the iron core wire grooves, the wires are tightly attached to the outer diameter ends of the iron core wire grooves, oil way channels are formed between the wires and the inner diameter ends of the iron core wire grooves, the two ends of the stator iron core are provided with end rings, and the two ends of the stator iron core are provided with end rings. The end ring wraps the wire, and the end ring and the oil path channel form a closed oil path space. Due to the adoption of the technical scheme, the oil path channel formed between the wire and the inner diameter end of the iron core wire slot is matched with the closed oil path space formed by the end ring and the oil path channel, and the position of the oil path channel is used for accurately cooling the wire with the highest heating.

Description

Technical Field

[0001] The invention relates to the technical field of motor cooling, and in particular to a slot liquid cooling structure of a flat wire motor stator. Background Art

[0002] Flat wire motors are widely used in new energy vehicles, industrial drives, aerospace, and other fields due to their high power density, high efficiency, and miniaturization. However, high power density also means greater heat generation per unit volume. Inadequate cooling can lead to excessive motor temperature rise, causing insulation aging, reduced efficiency, and even permanent damage. Therefore, efficient cooling technology is a key guarantee for the reliable operation of flat wire motors. Extensive research and development has been conducted on cooling technology for flat wire motors. For example, the invention patent with publication number CN110808645A, "A Cooling Structure for an Oil-Cooled Flat Wire Motor Stator," describes a cooling structure for an oil-cooled flat wire motor stator. An oil hole is provided between the outer diameter ends of two adjacent winding slots on the stator core. Two oil-conducting structures are also fixed to the end face of the stator core. The first oil-conducting structure is an annular structure that overlaps with the end face of the stator core and is provided with oil holes corresponding to the oil holes. The second oil-conducting structure is fitted with the first oil-conducting structure. The second oil-conducting structure is provided with a boss and an oil channel inlet on the outer diameter side, and a plurality of oil spray holes are provided on the side of the boss close to the winding. The fitting surfaces of the two oil-conducting structures are provided with grooves, and oil channels are formed after fitting. The main function of the first and second oil-conducting structures is to effectively flow the oil through the oil holes and the oil spray holes, thereby increasing the cooling efficiency and uniformity. The present invention can effectively improve the cooling effect of the flat wire motor stator and is suitable for Hair-pin and I-pin winding stators. The invention forms an oil channel by matching the grooves on the fitting surface of the oil-conducting structure, thereby cooling the inside of the stator core and the outer diameter side of the flat wire winding.

[0003] In addition, the invention patent application "Stator Lamination, Flat Wire Motor Stator, Flat Wire Motor, and Powertrain," with publication number CN118713330A, describes a stator lamination, a flat wire motor stator, a flat wire motor, and a powertrain. The stator lamination includes an inner circumferential surface and an outer circumferential surface radially opposed to each other. The stator lamination includes multiple grooves extending axially through the stator lamination. The grooves are spaced circumferentially, with the distance between each groove and the inner circumferential surface smaller than the distance between each groove and the outer circumferential surface. Each groove includes a center portion and an end portion, one end portion being arranged on a side of the center portion facing away from the center axis of the stator lamination. The end portion has a smaller dimension than the center portion along the circumferential direction of the stator lamination. Thus, a stator winding is passed through the center portion of each stator lamination's groove and wound around a stator core formed by laminating multiple stator laminations, with a gap between the stator winding and one end portion of the groove. When coolant flows into the gap, the coolant can cool the stator winding along the axial direction of the stator punching sheet, thereby improving the heat dissipation effect of the stator winding. This invention not only accommodates the winding through the grooves on the stator punching sheet, but also directly serves as an oil channel to cool the winding, thereby improving the heat dissipation effect of the stator winding. At the same time, the patent mentions that each groove includes a middle part, one end and another end, and at least one of the one end and the other end of each groove of each stator punching sheet of a sub-stator core can be used as a cooling oil channel. However, the cooling effect brought by such a structure is only contained in the cooling oil channel, and it is impossible to completely cover the winding exposed at both ends of the core with liquid cooling.

[0004] As can be seen, in existing winding cooling techniques, due to the design of the coolant flow path, the coolant cools the entire winding or the outer side of the winding. However, analysis of the temperature distribution of the winding reveals that the temperatures of the multiple wires along the winding vary, with the wires on the inner side of the winding having the highest temperature. Targeting this wire for cooling can achieve more precise and effective cooling. Summary of the Invention

[0005] The object of the present invention is to provide a slot liquid cooling structure for a flat wire motor stator, which realizes high-efficiency and low-consumption cooling of the motor stator through a precisely positioned, fully covered liquid cooling structure.

[0006] To achieve the aforementioned objectives, the present invention provides a slotted liquid-cooling structure for a flat wire motor stator, comprising a stator core, wherein closed core slots are evenly distributed on the inner edge of the stator core, and winding wires are inserted into the core slots. The wires are closely attached to one end of the outer diameter of the core slots and form an oil passage between the wires and the inner diameter end of the core slots. End rings are provided at both ends of the stator core, and the end rings wrap around the wires. The end rings and the oil passages form a closed oil passage space.

[0007] Preferably, the end rings at both ends of the stator core are provided with a liquid inlet and a liquid outlet, respectively. The liquid inlet is connected to a pump body to circulate the coolant, promptly dissipating the heat generated by the windings, preventing heat accumulation, effectively improving heat dissipation efficiency, and ensuring the stability of the stator core under high-load operation.

[0008] Preferably, the end ring is integrated with the stator core through two edges, wherein the outer edge of the end ring is inserted into the core wire slot, and the other side is fixed to the stator core through the assembly stop on the injection molded part. The two end rings are sealed by such a structure. It should be noted that the injection molded parts involved here can be separately molded and then installed in the stator core, or they can be directly injection molded on the stator core and integrated with the stator core. This connection method enhances the stability of the stator structure, ensures that the relative positions of the various components of the motor are fixed during operation, and the end ring also plays a certain protective role for the wires during operation, and can also reduce vibration and noise. At the same time, the structural design is compact, which helps to reduce the overall volume of the motor, improve space utilization, and achieve higher power density in a limited space.

[0009] Preferably, composite insulation paper is installed in the core wire trough, and the composite insulation paper matches the shape of the conductor, and the curled opening surface of the composite insulation paper is located at the end of the conductor close to the outer diameter of the core wire trough. The composite insulation paper mainly plays a role in protecting the conductor.

[0010] Preferably, the lower end of the composite insulating paper is close to the conductor. In this structure, the conductor is more closely protected, but the conductor itself is separated from the coolant by the composite insulating paper, which slightly affects the final cooling effect.

[0011] Preferably, the lower end of the composite insulating paper is positioned a certain distance from the conductor, dividing the oil channel into two sections. The upper portion of the oil channel, surrounded by the composite insulating paper, contains the coolant channel, ensuring full contact with the coolant while also being protected by the composite insulating paper. The lower structure of the oil channel aligns with the shape of the end ring's bayonet, allowing for insertion of the end ring.

[0012] Preferably, a first slope portion is provided on both side edges of the lower portion of the core wire trough adjacent to the oil passage, and an angle greater than 100 degrees is formed between the first slope portion and the side wall of the core wire trough. Such a large angle facilitates insertion of the wire into the core wire trough.

[0013] Preferably, the second slope portion is symmetrically arranged below the oil channel, and the channel edge thickness where the left and right second slope portions connect is 0.4-0.8 mm. In fact, the thinner the thickness, the better, but in order to ensure the strength during operation, it is usually not less than 0.4 mm.

[0014] Preferably, the width of the oil channel is 1 / 3-2 / 3 the width of the core slot. This width needs to balance the amount of liquid outflow and the risk of magnetic leakage. If the width is too small, the coolant flow rate is too low, which is not conducive to heat dissipation. If the width is too large, magnetic leakage may occur, affecting normal operation.

[0015] The present invention also includes a flat wire motor provided with the flat wire motor stator slot liquid cooling structure.

[0016] This invention is based on extensive research on flat-wire motors. Multiple conductors are installed in a single core slot, but the temperatures of these conductors are uneven. The first conductor, closest to the inner diameter, radiates the highest temperature during operation, sometimes with a temperature difference of over 20 degrees Celsius from the conductor closest to the outer diameter. Therefore, cooling this conductor can achieve maximum cooling efficiency with less coolant.

[0017] Due to the adoption of the technical solution, the present invention has the following technical effects.

[0018] 1. Fully enclosed cooling: The oil channel formed between the conductor and the inner diameter end of the core wire slot, combined with the end ring and the oil channel to form a closed oil path, allows the coolant to directly contact the heated conductors, removing heat. The end ring cools all conductors, while the oil channel precisely cools the conductors with the highest heat generation, resulting in an extremely effective cooling method.

[0019] 2. Optimize the cooling path and guide the coolant to flow reasonably in the oil channel through the composite insulation paper to ensure that the coolant fully covers the heating area and enhance the heat dissipation effect.

[0020] 3. Enhanced electromagnetic performance: The use of closed core slots, compared to open or semi-open slots, can better confine the magnetic field and reduce magnetic leakage. This allows the magnetic field to be more concentrated on the winding, improving the electromagnetic energy conversion efficiency, thereby improving the motor's output torque and operating efficiency.

[0021] 4. Convenience of manufacturing and maintenance: The end ring has a simple structure while ensuring airtightness. If the winding or cooling system needs to be repaired, the independent end ring is easy to disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 The present invention is a cross-sectional view of a stator core with a slotted liquid cooling structure of a flat wire motor stator.

[0024] Figure 2It is a front schematic diagram of a stator core with a slotted liquid cooling structure of a flat wire motor stator according to the present invention.

[0025] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0026] Figure 4 yes Figure 3 Enlarged schematic diagram of point B in the middle.

[0027] Figure 5 The present invention is a schematic diagram of a flat wire motor stator with a slotted liquid cooling structure and a stator core without a composite insulating paper structure.

[0028] Figure 6 yes Figure 1 Enlarged schematic diagram of point C in the middle.

[0029] Among them: 1. stator core, 2. core wire slot, 3. wire, 4. end ring, 41. liquid inlet, 42. liquid outlet, 5. oil channel, 51. first slope portion, 52. second slope portion, 6. composite insulating paper, 7. injection molded part, 8. assembly stop, 9. closed oil channel space. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] It should be noted that in the prior art, the core slots 2 of flat wire motors are typically not closed slots, but rather open or semi-open slots. This design choice is primarily based on the balance between the flat wire winding's manufacturing process characteristics, heat dissipation requirements, and electromagnetic performance. Because flat wire windings use rigid copper wire with rectangular or trapezoidal cross-sections, they are highly rigid and have a fixed shape. Unlike traditional round wire windings, closed slots cannot be flexibly filled using a winding machine. Closing slots requires a segmented core or complex winding process, which not only increases manufacturing costs and equipment complexity but also prevents the cooling medium from directly contacting the winding surface, leading to heat accumulation. The high power density of flat wire motors places extremely high demands on heat dissipation. Therefore, an open slot design is more conducive to the cooling medium penetrating the winding gaps, improving heat dissipation efficiency. In contrast, open slots offer adaptability in manufacturing processes, meeting the requirements of insertion processes. Their slot width is typically 1.2-1.5 times the width of the conductor 3. This provides ample space for automated equipment to insert preformed conductors 3 layer by layer into the slots, preventing copper wire deformation or slippage of the insulation paper. This also allows for more flexible guide mechanism design, ensuring precise alignment of the copper wire with the slot opening. The tight tolerances of closed slots significantly increase the difficulty of equipment commissioning. In terms of balancing electromagnetic performance and slot fill rate, the slot fill rate of flat wire motors, at 60%-80%, is significantly higher than that of round wire motors, at approximately 40%. Open slots increase power density by arranging copper wires at a high density. Regarding heat dissipation and material compatibility, open slots allow cooling oil to penetrate through the slot openings into the winding gaps, enhancing heat dissipation. Their larger gaps facilitate the placement of insulation paper and the varnishing process. The narrow space of closed slots, however, can easily lead to uneven insulation filling or residual bubbles. It can be said that in current industry applications, flat wire motors for new energy vehicles and industrial motors all adopt open slot or semi-open slot designs, combined with oil cooling or hybrid cooling technology to achieve high performance and reliability.

[0032] This is mentioned in the background of the present invention, which is the invention patent application with publication number CN110808645A, "A cooling structure for oil-cooled flat wire motor stator". Figure 1-4 and the drawings in the specification of the invention patent publication number CN118713330A "Stator Punching Sheet, Flat Wire Motor Stator, Flat Wire Motor and Power Assembly" Figure 4 This can be seen in Figures 11 and 12.

[0033] It is necessary to explain in addition that in Figures 9 and 10 of the specification of the invention patent "Stator Punching Sheet, Flat Wire Motor Stator, Flat Wire Motor and Powertrain", although it appears that the G113 end is drawn as a closed end, it is not stated in the claims and the specification that this end is a closed end. And according to the contents recorded in the claims and the specification, there is no technical inspiration to indicate that this end is a closed end. In fact, the design of this end in the comparative document is flawed. If this end is open, oil leakage will occur during operation, and the rotor will stir the oil, affecting efficiency. If this end is a closed end, due to the lack of optimized settings and the small oil flux, the expected cooling effect cannot be achieved.

[0034] In order to clearly express the content of the present invention, the main structure of the present invention is first explained.

[0035] The stator core 1 is a crucial component of the flat wire motor and is made from laminated high-permeability silicon steel sheets. These sheets feature low hysteresis losses and high magnetic permeability, effectively reducing energy losses in the alternating magnetic field and improving motor efficiency. Closed core slots 2 are evenly distributed along its inner edge. These slots provide space for conductors 3 and serve as a key component of the magnetic circuit, guiding and confining the magnetic field, enabling it to interact effectively with the windings to generate the electromagnetic force that drives the motor.

[0036] Core slots 2: Evenly distributed on the inner edge of the stator core 1, they are used to accommodate the winding wires 3. In existing technologies, the core slots 2 of flat wire motors are mostly open slots, which are different from the slots of traditional round wire motors.

[0037] Wire 3: Made of rigid copper wire with a rectangular or trapezoidal cross-section, it is wound into a winding and inserted into the core slots 2. It is a key component in the motor's conversion of electrical energy into mechanical energy. When current flows through it, it generates a magnetic field, which interacts with the magnetic field of the stator core 1 to generate an electromagnetic force, driving the motor.

[0038] Coolant: In this flat wire motor stator slot liquid cooling structure, the selection of coolant needs to comprehensively consider heat dissipation performance, electrical insulation, chemical stability, material compatibility and environmental protection. Suitable coolants mainly include the following categories:

[0039] Mineral oil-based coolant: Mineral oil is extracted from petroleum and has excellent electrical insulation properties, effectively preventing internal short circuits in motors. It has high chemical stability, is not easily oxidized or deteriorated within a certain temperature range, and has a relatively long service life.

[0040] Synthetic oil-based coolant: such as ester oil, silicone oil, etc. Ester oil has excellent thermal stability and oxidation stability, can operate stably for a long time at high temperature, and reduce the generation of carbon deposits and coking.

[0041] Fluorinated liquid coolant: Fluorinated liquid has a low boiling point and high latent heat of vaporization. After absorbing heat, it vaporizes quickly, removing a large amount of heat and achieving high cooling efficiency. It also has excellent electrical insulation properties and is non-conductive, so even if a leak occurs inside the motor, it will not cause a short circuit.

[0042] Water-Based Coolant: Water has a high specific heat capacity and can absorb large amounts of heat. Its latent heat of vaporization is also high, resulting in excellent heat dissipation, effectively dissipating the heat generated by flat-wire motors. Deionized water is a common choice, as it removes conductive ions, significantly reducing conductivity and meeting the strict electrical insulation requirements of motors, thus preventing the risk of short circuits. However, pure water tends to freeze at low temperatures and evaporate at high temperatures. Therefore, antifreeze agents such as ethylene glycol and propylene glycol are often added to create water-ethylene glycol or water-propylene glycol mixed coolants. These mixtures not only lower the freezing point and raise the boiling point, but also exhibit excellent fluidity, ensuring proper cooling under varying operating conditions.

[0043] In addition, it should be noted that, unlike the prior art, the present invention adopts a closed structure, so in some extreme cases, liquid water can be directly used as the coolant without deionization treatment. This can reduce operating costs to a certain extent.

[0044] The technical solution proposed by the present invention is as follows Figure 1 As shown, a slotted liquid cooling structure for a flat wire motor stator comprises a stator core 1. Closed core slots 2 are evenly distributed along the inner edge of the stator core 1. Winding conductors 3 are inserted into the core slots 2. The conductors 3 are closely attached to one end of the outer diameter of the core slots 2, forming an oil passage 5 with the inner diameter end of the core slots 2. First slopes 51 are provided on both sides of the lower edge of the core slots 2, adjacent to the oil passage 5. The first slopes 51 and the sidewalls of the core slots 2 form an angle greater than 100 degrees. This large angle facilitates insertion of the conductors 3 into the core slots 2. Second slopes 52 are symmetrically provided below the oil passage 5. The thickness of the channel edge at the junction of the left and right second slopes 52 is 0.4-0.8 mm. The width of the oil passage 5 is 1 / 3-2 / 3 of the width of the core slots 2. This structure maximizes the coolant capacity within the oil passage 5 and provides a good cooling effect.

[0045] The stator core 1 is provided with end rings 4 at both ends, and the end rings 4 wrap the wires 3. The end rings 4 and the oil passage 5 form a closed oil passage space. The end rings 4 are integrated with the stator core 1 through two edges, wherein the outer edge of the end ring 4 is inserted into the core wire slot 2, and the other side is fixed to the stator core 1 through the assembly stop 8 on the injection molded part 7. Such a structure realizes the sealing of the two end rings 4. The end rings 4 provided at both ends of the stator core 1 are respectively provided with a liquid inlet 41 and a liquid outlet 42. The liquid inlet 41 is externally connected to the pump body, which can realize the circulation of the coolant and promptly remove the heat generated by the winding.

[0046] Example 1:

[0047] will be as Figure 2 The stator core 1 shown is prepared, and composite insulation paper 6 is placed in each core slot 2. Figure 3 as well as Figure 4 As shown, in this embodiment, the lower end of the composite insulating paper 6 is at a certain distance from the conductor 3, and this section of composite insulating paper 6 divides the oil channel 5 into two parts. The upper part of the oil channel 5 is surrounded by the composite insulating paper 6 and is the channel for the coolant, so that the conductor 3 can fully contact the coolant and is also protected by the composite insulating paper 6. The first slope portion 51 of the lower part of the core wire slot 2 adjacent to the two side edges of the oil channel 5 is greater than 100 degrees from the side wall of the core wire slot 2, which facilitates the insertion of the conductor 3. The lower structure of the oil channel 5 is consistent with the shape of the bayonet of the end ring 4, which is used to insert the end ring 4. When the composite insulating paper 6 and the conductor 3 are installed, the end rings 4 at both ends of the stator core 1 form an integrated structure with the stator core 1 through two edges, wherein the bayonet on the outer edge is inserted into the core wire slot 2, and the other side is fixed by the injection molded part 7. This connection method ensures the airtightness of the two end rings 4 and enhances the stability of the stator structure. After completion, the rear end ring 4 and the oil passage 5 form a closed oil passage space 9 for the coolant to flow.

[0048] During the operation of the motor, heat is generated by the current passing through the wire 3. In order to ensure the normal operation and performance of the motor, heat needs to be dissipated in time. At this time, the external pump body pumps the coolant into the closed oil circuit space through the liquid inlet 41 on the end ring 4. The coolant first enters the end ring 4 position, and then enters the channel surrounded by the composite insulating paper 6 at the upper part of the oil channel 5, and flows in the channel. At this time, it should be noted that the coolant is in full contact with the wire 3 closest to the inner diameter side, and that wire 3 is the one with the highest heat temperature during operation. If there is no coolant, its normal temperature during operation is as high as 180 degrees Celsius. By cooling with the coolant, its temperature can be reduced to 155-160 degrees Celsius, a reduction of 10%-15%. The coolant can maintain a suitable flow rate and flow in the channel, fully contacting the heated wire 3 and taking away the heat. After absorbing heat in the oil channel 5, the coolant flows out through the liquid outlet 42 on the other side end ring 4 and returns to the pump body for circulation cooling. This process is repeated to promptly remove the heat generated by the winding, avoid heat accumulation, and ensure the stability of the motor under high load operation.

[0049] Example 2:

[0050] will be as Figure 2 The stator core 1 shown is prepared, and a composite insulating paper 6 is placed in each core wire slot 2. In this embodiment, the composite insulating paper 6 installed in the core wire slot 2 matches the shape of the wire 3, and the curled opening surface of the composite insulating paper 6 is located at the end of the outer diameter of the wire 3 close to the core wire slot 2. The first slope portion 51 of the lower part of the core wire slot 2 adjacent to the two side edges of the oil channel 5 is greater than 100 degrees from the side wall of the core wire slot 2, which facilitates the insertion of the wire 3. When the composite insulating paper 6 and the wire 3 are installed, the end rings 4 at both ends of the stator core 1 form an integrated structure with the stator core 1 through two edges, wherein the bayonet on the outer edge is inserted into the core wire slot 2, and the other side is fixed by the injection molded part 7. This connection method ensures the airtightness of the two end rings 4 and enhances the stability of the stator structure. After completion, the end rings 4 and the oil channel 5 form a closed oil path space 9 for the coolant to flow.

[0051] During the operation of the motor, heat is generated by the current passing through the wire 3. In order to ensure the normal operation and performance of the motor, heat must be dissipated in time. At this time, the external pump body pumps the coolant into the closed oil circuit space through the liquid inlet 41 on the end ring 4. The coolant first enters the end ring 4 position, then enters the oil channel 5, and flows in the channel. In this embodiment, since the wire 3 is fully protected by the composite insulating paper 6, the cooling effect is not as good as in Example 1. In this embodiment, the temperature can be reduced to 162-

[0052] At 165 degrees Celsius, the coolant maintains a suitable flow rate and volume within the channel, fully contacting the heated wire 3 and removing heat. After absorbing heat in the oil channel 5, the coolant flows out through the outlet 42 on the other end ring 4 and returns to the pump body for further cooling. This cycle is repeated, promptly removing heat generated by the windings, preventing heat accumulation and ensuring the stability of the motor under high-load operation.

[0053] The composite insulating paper 6 described in the two embodiments above is made of a variety of materials, typically polyester film, polyimide film, and other materials. Polyester film, produced by the polycondensation of terephthalic acid and ethylene glycol, is relatively low-cost and offers high mechanical strength, excellent insulation, and chemical stability. It is suitable for general motors and electrical appliances and can operate for extended periods at temperatures between 105°C and 120°C. Polyimide film, produced by the polycondensation of dianhydride and diamine, exhibits excellent high-temperature resistance and can operate for extended periods above 200°C. It offers excellent electrical insulation, mechanical, and chemical stability, making it suitable for specialized motors operating in high-temperature, high-voltage, and other special environments.

[0054] Example 3:

[0055] Same as Example 2, but in this embodiment, the composite insulating paper 6 is not provided. This makes the structure simpler. Figure 5 The stator core 1 shown is prepared, and the winding wire 3 is directly inserted into the core wire slot 2. The wire 3 is close to the outer diameter end of the core wire slot 2, and an oil path 5 is formed between the wire 3 and the inner diameter end of the core wire slot 2. At this time, since there is no composite insulating paper 6, the wire 3 can directly contact the coolant. The end rings 4 at both ends of the stator core 1 form an integrated structure with the stator core 1 through two edges, wherein the bayonet on the outer edge is inserted into the core wire slot 2, and the other side is fixed by the injection molded part 7. This connection method ensures the airtightness of the two end rings 4 and enhances the stability of the stator structure. After completion, the end rings 4 and the oil path 5 form a closed oil path space 9 for the coolant to flow.

[0056] During motor operation, current flowing through the conductor 3 generates heat. To ensure the proper operation and performance of the motor, timely heat dissipation is necessary. At this point, the external pump pumps coolant into the enclosed oil circuit space through the liquid inlet 41 on the end ring 4. The coolant first enters the end ring 4 and then smoothly enters the oil channel 5. Because this embodiment does not have composite insulating paper 6, the coolant can directly and fully contact the conductor 3, significantly improving the cooling effect compared to the embodiment with composite insulating paper 6. The coolant can maintain a suitable flow rate and flow rate within the channel, effectively contacting the heated conductor 3 and quickly removing heat. After absorbing heat in the oil channel 5, the coolant flows out through the liquid outlet 42 on the other end ring 4 and returns to the pump body for circulating cooling. This repeated process promptly removes heat generated by the windings, preventing heat accumulation and effectively ensuring the stability of the motor under high-load operation. Testing has shown that under the same operating conditions and heating conditions, the temperature of the motor windings in this embodiment can be further reduced by approximately 13 degrees Celsius compared to the embodiment with composite insulating paper 6, significantly improving the overall performance and reliability of the motor.

[0057] It should be noted that in this embodiment, the composite insulating paper 6 is not provided, but an insulating portion needs to be injection-molded at the lower end of the injection-molded part 7 when producing the injection-molded part 7 to ensure the insulation performance in the core wire slot 2. Therefore, the process and cost are increased.

[0058] The present invention also includes a flat wire motor equipped with the slot-type liquid cooling structure described in any of the above embodiments. Slot cooling in such a flat wire motor directly cools the hottest areas of the winding, improving heat dissipation efficiency and evenly cooling the coils, eliminating blind spots. This significantly increases the ratio of the motor's continuous operating power to its peak power. Furthermore, such a flat wire motor avoids sacrificing slot fill rate, maintaining more efficient use of the space surrounding the motor conductors 3. Furthermore, the cooling components occupy less space.

[0059] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of implementation of the present invention. Any person of ordinary skill in the art can make some improvements without departing from the scope of the invention of the present invention, that is, all equivalent improvements made in accordance with the present invention should be covered by the scope of the present invention. In the description of this specification, the description of the reference terms "one embodiment / method", "some embodiments / methods", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples without contradicting each other.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0061] Those skilled in the art will appreciate that the above embodiments are merely intended to clearly illustrate the present disclosure and are not intended to limit the scope of the present disclosure. Other changes or modifications may be made based on the above disclosure, and such changes or modifications are still within the scope of the present disclosure.

Claims

1. A slot liquid cooling structure for a flat wire motor stator, comprising a stator core, characterized in that: Closed core wire slots are evenly distributed on the inner edge of the stator core, and winding wires are inserted into the core wire slots. The wires are close to one end of the outer diameter of the core wire slots and form an oil path between the wires and the inner diameter end of the core wire slots. End rings are provided at both ends of the stator core, and the end rings wrap the wires. The end rings and the oil path form a closed oil path space.

2. The slot liquid cooling structure of a flat wire motor stator according to claim 1, characterized in that: The end rings at both ends of the stator core are respectively provided with a liquid inlet and a liquid outlet.

3. A slot liquid cooling structure for a flat wire motor stator according to claim 1 or 2, characterized in that: The end ring is integrated with the stator core through two edges, wherein the outer edge of the end ring is inserted into the core wire slot, and the other side is fixed to the stator core through the injection molding part.

4. A slot liquid cooling structure for a flat wire motor stator according to claim 1 or 2, characterized in that: Composite insulating paper is installed in the iron core wire slot, and the composite insulating paper matches the shape of the conductor. The curled opening surface of the composite insulating paper is located at one end of the outer diameter of the conductor close to the iron core wire slot.

5. The slot liquid cooling structure of the flat wire motor stator according to claim 4, characterized in that: The lower end of the composite insulating paper is in close contact with the conductor.

6. The slot liquid cooling structure of the flat wire motor stator according to claim 4, characterized in that: The lower end of the composite insulating paper is a certain distance away from the conductor, and this section of composite insulating paper divides the oil channel into two parts.

7. A slot liquid cooling structure for a flat wire motor stator according to claim 1, 2 or 4, characterized in that: A first slope portion is provided on both side edges of the lower portion of the core wire slot adjacent to the oil passage, and an angle greater than 100 degrees is formed between the first slope portion and the side wall of the core wire slot.

8. The slot liquid cooling structure of a flat wire motor stator according to claim 1, 2 or 4, characterized in that: A second slope portion is symmetrically arranged below the oil channel, and the thickness of the channel edge where the left and right second slope portions are connected is 0.4-0.8 mm.

9. A slot liquid cooling structure for a flat wire motor stator according to claim 1, 2 or 4, characterized in that: The width of the oil passage is 1 / 3-2 / 3 of the width of the iron core slot.

10. A flat wire motor, characterized in that: A slot liquid cooling structure for a flat wire motor stator is provided as described in any one of claims 1 to 9.

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