A stator assembly for a flat wire motor

Abstract

This invention provides a stator assembly for a flat wire motor, relating to the field of motors. The stator assembly includes: a stator core having slots; a flat wire winding including a straight section and an end portion, the straight section being located within the slots and the end portion extending beyond the slots; and an oil holder contacting the end portion of the flat wire winding to retain cooling oil between the contact surface of the oil holder and the flat wire winding. This stator assembly improves the cooling capacity of the end portion of the flat wire winding.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more particularly to a stator assembly for a flat wire motor. Background Technology

[0002] Flat wire motors use rectangular conductors for their windings. They offer advantages such as high efficiency, small size, and low noise. However, during high-speed operation, a significant amount of heat is generated in the stator windings. To reduce the risk of overheating and damage, cooling oil is sprayed onto the ends of the windings to lower their temperature. Compared to round wire motors, spraying cooling oil is less effective at cooling the ends of the windings in flat wire motors. Summary of the Invention

[0003] This invention provides a stator assembly for a flat wire motor, which addresses how to improve the cooling effect of spraying cooling oil on the ends of the windings of the flat wire motor.

[0004] This invention provides a stator assembly for a flat wire motor, the stator assembly comprising: a stator core having a wire slot; a flat wire winding including a straight section and an end portion, the straight section being located within the wire slot and the end portion extending out of the wire slot; and an oil holder contacting the end portion of the flat wire winding for maintaining cooling oil between the contact surface of the oil holder and the flat wire winding.

[0005] Furthermore, the oil-hanging component includes a first oil-hanging strip, which surrounds the end of the flat wire winding circumferentially, and the first oil-hanging strip is capable of absorbing or delaying cooling oil.

[0006] Furthermore, the first oil-coated strip contacts the annular outer wall of the end of the flat wire winding.

[0007] Furthermore, the first oil-coated strip contacts the annular inner wall of the end of the flat wire winding.

[0008] Furthermore, the first oil-coating strip includes: a first inner oil-coating strip that contacts the annular inner wall of the end of the flat wire winding; and a first outer oil-coating strip that contacts the annular outer wall of the end of the flat wire winding.

[0009] Furthermore, the first oil-coating belt also includes an intermediate oil guide, located between the first inner oil-coating belt and the first outer oil-coating belt, and in contact with the first inner oil-coating belt and the first outer oil-coating belt respectively. The intermediate oil guide enables the cooling oil to flow between the first inner oil-coating belt and the first outer oil-coating belt.

[0010] Furthermore, the upper part of the first external oil belt has an oil passage hole, and the angle between the axis of the oil passage hole and the vertical direction is less than a preset acute angle.

[0011] Furthermore, there are multiple intermediate oil guides, each of which is located below the end and is spaced apart circumferentially along the first inner oil strip.

[0012] Furthermore, the oil absorption rate of the first oil-coating belt increases from the top to the bottom of the first oil-coating belt.

[0013] Furthermore, the thickness of the first oil-coating strip increases from the top to the bottom.

[0014] Furthermore, the oil hanging component includes: a first oil hanging rope, which is capable of absorbing or delaying cooling oil, and is wound around the surface of the end along the circumference of the end.

[0015] Furthermore, the first oil-soaked rope is wound to form a mesh structure.

[0016] Furthermore, the density of the mesh structure increases from the top to the bottom of the first oil-hanging rope.

[0017] Furthermore, the oil-hanging component includes: a second oil-hanging strip, which is capable of absorbing or delaying cooling oil and is in contact with the annular inner wall and / or the annular outer wall of the end; and a second oil-hanging rope, which is capable of absorbing or delaying cooling oil and is wound around the surface of the end and the second oil-hanging strip along the circumference of the end.

[0018] Furthermore, the second oil-coating strip includes: a second inner oil-coating strip that contacts the annular inner wall of the end of the flat wire winding; and a second outer oil-coating strip that contacts the annular outer wall of the end of the flat wire winding; wherein the second oil-coating rope is coiled around the surfaces of the second inner oil-coating strip, the second outer oil-coating strip, and the end.

[0019] This invention provides a stator assembly for a flat wire motor. The stator assembly includes a stator core with slots, a flat wire coiled in the slots to form an annular flat wire winding, with the end of the flat wire winding extending out of the stator core, and an oil hanger that contacts the end of the flat wire winding. The oil hanger is used to hold cooling oil between the contact surface between the oil hanger and the flat wire winding. That is, the oil hanger enables the cooling oil to flow between the oil hanger and the contact surface between the oil hanger and the end of the flat wire, and can reduce the flow rate of the cooling oil between the oil hanger and the contact surface between the oil hanger and the end face of the flat wire winding. This allows the cooling oil to have a longer time to exchange heat more fully with the end of the flat wire winding, thereby improving the cooling effect of the cooling oil on the end of the flat wire winding. Attached Figure Description

[0020] Figure 1 A schematic diagram of the stator assembly of a flat wire motor provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a first type of oil-coating component in the stator assembly of a flat wire motor provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the second type of oil-coating component in the stator assembly of the flat wire motor provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a third type of oil-coating component in the stator assembly of a flat wire motor provided in an embodiment of the present invention;

[0024] Figure 5 A diagram showing the first relative positional relationship between the end of the flat wire winding and the third type of oil hanger in the stator assembly of the flat wire motor provided in this embodiment of the invention.

[0025] Figure 6 A diagram showing the second relative positional relationship between the end of the flat wire winding and the third type of oil hanger in the stator assembly of the flat wire motor provided in an embodiment of the present invention.

[0026] Figure 7 A diagram showing the third relative position relationship between the end of the flat wire winding in the stator assembly of the flat wire motor provided in this embodiment of the invention and the third type of oil hanger;

[0027] Figure 8 This is a schematic diagram of another structure of the stator assembly of the flat wire motor provided in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the assembly of the end of the flat wire winding in the stator assembly of the flat wire motor provided in the embodiment of the present invention with the fourth type of oil hanger.

[0029] Figure 10 This is a schematic diagram of another structure of the stator assembly of the flat wire motor provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Stator assembly; 10. Stator core; 20. Flat wire winding; 21. End; 30. Oil hanger; 30A. Type 1 oil hanger; 31A. Oil inlet; 32A. Oil inlet channel; 33A. Flow cavity; 34A. Oil outlet channel; 35A. Oil outlet; 30B. Type 2 oil hanger; 31B. Protective strip; 311B. Through hole; 32B. Oil suction strip; 30C. Type 3 Oil hanging component; 31C, first oil hanging belt; 311C, first inner oil hanging belt; 312, first outer oil hanging belt; 313C, intermediate oil guide component; 314C, oil passage hole; 30D, fourth type of oil hanging component; 31D, first oil hanging rope; 30E, fifth type of oil hanging component; 31E, second oil hanging belt; 311E, second inner oil hanging belt; 312E, second outer oil hanging belt; 312E, second oil hanging rope. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this invention will not be described separately.

[0034] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0035] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. The term "connection," unless otherwise specified, includes both direct and indirect connections.

[0036] The stator assembly of the flat wire motor provided in the following specific embodiments can be applied to any type of flat wire motor. For example, the stator assembly can be applied to a machine tool, and for example, it can also be applied to an electric vehicle. For ease of explanation, the stator assembly of the flat wire motor will be described below as an example of its application in the drive motor of an electric vehicle.

[0037] In some embodiments, such as Figure 1 As shown, the stator assembly 1 includes: a stator core 10, a flat wire winding 20, and an oil-coating component 30. The stator core 10 is a metal component capable of improving magnetic permeability. This metal component can be, for example, a silicon steel sheet. Multiple silicon steel sheets are stacked to form the stator core 10. The stator core 10 has wire slots, and multiple wire slots are spaced apart circumferentially along the stator core 10. The transverse cross-section of the conductor in the flat wire winding 20 is rectangular, and this transverse cross-section is perpendicular to the length direction of the conductor. The flat wire winding 20 includes end sections 21 and straight segments. The straight segments are located within the wire slots, and the end sections 21 extend out of the wire slots. Specifically, the multiple end sections 21 of the flat wire winding 20 form an annular end structure. This annular structure has an inner annular wall, an outer annular wall, and an end face connecting the inner and outer annular walls. The end sections 21 of the flat wire winding are spaced apart, with a large distance between adjacent wire ends, and all end sections 21 are located in the same plane. Furthermore, compared to… For round wire windings, the ends of flat wire windings 21 have higher structural strength, so there is no need to set a binding structure at the ends to fix the ends 21. If cooling oil is sprayed directly onto the ends 21 of flat wire windings 20, the cooling oil will have difficulty adhering to the ends of flat wire windings 20 and will flow out of the ends of flat wire windings 20 quickly, due to the large spacing between the ends 21 of flat wire windings 20 and the flush end faces of each end 21. At the same time, there is no binding structure to hold the cooling oil. As a result, the cooling effect of the cooling oil on the ends of flat wire windings 20 is not good.

[0038] The oil hanger 30 contacts the end 21 of the flat wire winding 20 to hold the cooling oil between the contact surfaces of the oil hanger 30 and the end 21 of the flat wire winding 20. This can be understood as the cooling oil entering the oil hanger 30 and flowing within it to the contact surface between the oil hanger 30 and the flat wire winding 20. At the same time, the oil hanger 30 can also reduce the flow rate of the cooling oil between the contact surfaces of the oil hanger 30 and the flat wire winding 20, thereby prolonging the contact time between the cooling oil and the flat wire winding 20, allowing the cooling oil to have a longer time to exchange heat with the flat wire winding 20, and thus improving the cooling effect of the cooling oil on the end 21 of the flat wire winding 20. It should be noted that the oil hanger 30 can be any component that allows cooling oil to flow between the contact surface of the oil hanger 30 and the flat wire winding 20, and can reduce the flow rate of the cooling oil between the contact surface of the oil hanger 30 and the flat wire winding 20. The oil hanger 30 can achieve the above function through any principle. For example, the oil hanger 30 can achieve the above function through structural design, or it can achieve the above function through the properties of the material. The following will be combined with Figure 2 and Figure 3 The structure of the oil-hanging component 30 is described by way of example, and those skilled in the art should understand that... Figure 2 and Figure 3 This is merely an illustrative description of the structure of the oil-holding component 30. The principle by which the oil-holding component 30 achieves the above-mentioned functions and the specific structure of the oil-holding component 30 may also be other than those described above. Figure 2 and Figure 3 Other structures besides the one shown.

[0039] like Figure 2 As shown, the first type of oil hanger 30A has an oil inlet hole 31A, an oil inlet channel 32A, a flow cavity 33A, an oil outlet channel 34A, and an oil outlet hole 35A. The oil inlet hole 31A is located on the outer surface of the top of the first type of oil hanger 30A. The oil inlet channel 32A is located inside the first type of oil hanger 30A and communicates with the oil inlet hole 31A. The flow cavity 33A extends to the first type of oil hanger 30A for connecting with the oil outlet hole 35A. Figure 1The flat wire winding 20 in the middle contacts the end 21 of the surface, and the flow cavity 33A is also connected to the oil guide channel 32A. The oil outlet hole 35A is located on the outer surface of the bottom of the first type of oil hanger 30A, and the oil outlet channel 34A is located inside the first type of oil hanger 30A and connects the flow cavity 33A and the oil outlet hole 35A. The area of ​​the flow cavity 33A is different in different radial sections of the first type of oil hanger 30A. Cooling oil flows into the first type of oil hanger 30A through the oil inlet 31A, flows into the flow cavity 33A through the oil inlet channel 32A, and flows along the circumference of the end 21 of the flat wire winding 20 in the flow cavity 33A, contacting and cooling the end 21 of the flat wire winding 20. It then flows out of the first type of oil hanger 30A through the oil outlet channel 34A and the oil outlet 35A. Since the area of ​​the flow cavity 33A in different radial sections of the first type of oil hanger 30A is different, the flow rate of the cooling oil will decrease during the flow of the variable cross section of the flow cavity 33A, and the cooling oil has a longer time to exchange heat with the end 21 of the flat wire winding 20.

[0040] like Figure 3 As shown, the second type of oil-absorbing component 30B includes: a protective belt 31B and an oil-absorbing belt 32B. The protective belt 31B is fixed to the annular outer wall of the oil-absorbing belt 32B. Multiple through holes 311B are spaced apart along the circumference of the protective belt 31B. The oil-absorbing belt 32B is made of a material capable of absorbing cooling oil, and the annular inner wall of the oil-absorbing belt 32B is... Figure 1 The cooling oil contacts the annular outer wall of the flat wire winding 20. Cooling oil flows through the through-hole 311B to the annular outer wall of the oil suction band 32B and is drawn into the oil suction band 32B. Under the combined action of gravity and the capillary action of the oil suction band 32B, the cooling oil flows circumferentially along the annular outer wall of the flat wire winding 20 within the oil suction band 32B. The oil suction band 32B can retain more cooling oil at the end 21 of the flat wire winding 20 by absorbing it. Simultaneously, the oil suction band 32B can guide the flow direction of the cooling oil along the circumferential movement of the end 21 of the flat wire winding 20, rather than allowing it to flow directly and rapidly out of the end 21 of the flat wire winding 20 in the vertical direction. Compared to the cooling oil flowing directly out of the end 21 of the flat wire winding 20 in the longitudinal direction under the action of gravity, the cooling oil flows more slowly within the oil suction band 32B under the capillary action of the oil suction band 32B, allowing for a longer period of heat exchange with the end 21 of the flat wire winding 20. The protective belt 31B surrounds the outer surface of the oil suction belt 32B, which can reduce the possibility of damage to the oil suction belt 32B under the action of external force, and also reduce the possibility of coolant overflowing from the annular outer wall of the oil suction belt 32B under the action of gravity.

[0041] This invention provides a stator assembly for a flat wire motor. The stator assembly includes a stator core with slots, a flat wire winding with a straight section located within the slots and an end extending out of the slots, and an oil-holding member that contacts the end of the flat wire winding. The oil-holding member is used to maintain cooling oil between the contact surface between the oil-holding member and the flat wire winding. That is, the oil-holding member enables the cooling oil to flow between the oil-holding member and the contact surface between the oil-holding member and the end of the flat wire, and can reduce the flow rate of the cooling oil between the oil-holding member and the contact surface between the oil-holding member and the end face of the flat wire winding. This allows the cooling oil to have a longer time to perform more thorough heat exchange with the end of the flat wire winding, thereby improving the cooling effect of the cooling oil on the end of the flat wire winding.

[0042] In some embodiments, such as Figure 4 As shown, the third type of oil-hanging component 30C includes a first oil-hanging strip 31C. The first oil-hanging strip 31C surrounds the end 21 of the flat wire winding 20 circumferentially. The first oil-hanging strip 31C can absorb or delay cooling oil. That is, the first oil-hanging strip can extend the contact time between the cooling oil and the end face by absorbing or extending the flow path of the cooling oil on the end face, thereby allowing the cooling oil to have a longer time to fully exchange heat with the end face, thereby improving the cooling effect of the cooling oil on the end face. For example, the surface of the first oil-hanging strip 31C in contact with the end face has a labyrinth-shaped oil storage groove, thereby extending the flow path of the cooling oil on the end face. For example, the first oil-hanging strip 31C is made of a material that can absorb cooling oil, such as flax or cotton. For ease of explanation, the following description will use the example of the first oil-hanging strip 31C absorbing cooling oil. By absorbing cooling oil through the first oil-coated band 31C, more cooling oil can be kept between the contact surface of the first oil-coated band 31C and the end 21 of the flat wire winding 20. Compared to the cooling oil flowing directly longitudinally out of the end 21 of the flat wire winding 20 under the action of gravity, the cooling oil flows more slowly within the first oil-coated band 31C due to capillary action. The cooling oil has a longer time to exchange heat with the end 21 of the flat wire winding 20. At the same time, compared to the cooling oil flowing directly longitudinally out of the flat wire winding 20, it is difficult for the cooling oil to flow to the bottom of the flat wire winding 20. The first oil-coated band 31C encircles the end 21 of the flat wire winding 20, allowing the cooling oil to flow to the bottom of the flat wire winding 20 under the capillary action of the first oil-coated band 31C. This allows the cooling oil to cool the bottom of the flat wire winding 20, thereby making the cooling of the flat wire winding 20 more uniform. It should be noted that the third type of oil hanger 30C can be fixedly connected to the stator core 10 or the flat wire winding 20 in any way. For example, the third type of oil hanger 30C is fixedly connected to the stator core 10 by an insulating fixing clip. For example, the third type of oil hanger 30C can also be fixedly tied to the end 21 of the flat wire winding 20 by an insulating strap.

[0043] In some embodiments, such as Figure 4 As shown, the first oil-coated strip 31C contacts the annular outer wall of the end 21 of the flat wire winding 20. Cooling oil is directly sprayed onto the outer surface of the first oil-coated strip 31C, thereby fully absorbing the sprayed cooling oil and keeping more cooling oil between the contact surface of the first oil-coated strip 31C and the end 21 of the flat wire winding 20, further improving the cooling effect of the cooling oil on the flat wire winding 20. Optionally, the outer surface of the first oil-coated strip 31C is made of a flexible material. When the cooling oil is sprayed onto the outer surface of the first oil-coated strip 31C, the outer surface of the first oil-coated strip 31C undergoes elastic deformation. The impact kinetic energy absorbed by this elastic deformation reduces the splashing effect of the cooling oil when it is sprayed onto the outer surface of the first oil-coated strip 31C and quickly draws the cooling oil sprayed onto the outer surface into the first oil-coated strip 31C, reducing the splashing loss of the cooling oil. Furthermore, more cooling oil is kept between the first oil-coated strip 31C and the annular outer wall of the flat wire winding 20, further improving the cooling capacity of the cooling oil to the end 21 of the flat wire winding 20.

[0044] In some embodiments, such as Figure 5 As shown, the first oil-coated strip 31C contacts the annular inner wall of the end 21 of the flat wire winding 20. The cooling oil is first sprayed onto the outer surface of the flat wire winding 20, thereby directly cooling the end face of the flat wire winding 20 for the first time. Under the action of gravity, the cooling oil flows through the gap of the wire end of the flat wire winding 20 to the first oil-coated strip 31C and is drawn into the first oil-coated strip 31C. Under the combined action of gravity and capillary action, the cooling oil flows along the circumference of the first oil-coated strip 31C and performs secondary cooling on the annular inner wall of the flat wire winding 20. It can be understood that by making the first oil-coated strip 31C contact the annular inner wall of the end 21 of the flat wire winding 20, the cooling oil can be fully utilized to perform secondary cooling on multiple parts of the flat wire winding 20, thereby making full use of the cooling oil and further improving the cooling capacity of the cooling oil on the end 21 of the flat wire winding 20.

[0045] In some embodiments, such as Figure 6As shown, the first oil-coating strip 31C includes a first inner oil-coating strip 311C and a first outer oil-coating strip 312C. Cooling oil is first sprayed onto the first outer oil-coating strip 312C and drawn in. Under the combined action of gravity and capillary action, the cooling oil flows circumferentially within the first outer oil-coating strip 312C along the end 21 of the flat wire winding 20, thereby cooling the annular outer wall of the end 21 of the flat wire winding 20. Simultaneously, cooling oil exceeding the absorption capacity of the first outer oil-coating strip 312C overflows and drips onto the first inner oil-coating strip 311C under gravity, where it is drawn in. Under the combined action of gravity and capillary action, the cooling oil flows circumferentially within the first inner oil-coating strip 311C along the end 21 of the flat wire winding 20, thereby cooling the annular inner wall of the end 21 of the flat wire winding 20. In summary, by setting the first inner oil band 311C and the first outer oil band 312C to contact the annular inner wall and annular outer wall of the end of the flat wire winding 20, respectively, more cooling oil can be brought into contact with the end 21 of the flat wire winding 20, thereby further improving the cooling capacity of the cooling oil on the end 21 of the flat wire winding 20. At the same time, by cooling both the annular inner wall and annular outer wall of the end 21 of the flat wire winding 20 with the first inner oil band 311C and the first outer oil band 312C, the uniformity of cooling of the end 21 of the flat wire winding 20 with the cooling oil can be further improved.

[0046] In some embodiments, such as Figure 7 As shown, the first oil-coating band 31C also includes an intermediate oil guide 313C. The intermediate oil guide 313C is located between the first inner oil-coating band 311C and the first outer oil-coating band 312C, and contacts both the first inner oil-coating band 311C and the first outer oil-coating band 312C respectively. The intermediate oil guide 313C enables the cooling oil to flow between the first inner oil-coating band 311C and the first outer oil-coating band 312C. Specifically, the cooling oil can flow from the first inner oil-coating band 311C through the intermediate oil guide 313C. The cooling oil flows from components with high saturation in the first external oil band 312C to components with low cooling oil saturation, thereby maintaining a dynamic balance in the saturation of the cooling oil in the first external oil band 312C and the first internal oil band 311C. This, in turn, maintains a dynamic balance in the cooling capacity of the first external oil band 312C and the first internal oil band 311C for the inner and outer annular walls of the end 21 of the flat wire winding 20, respectively, further improving the uniformity of cooling of the flat wire winding 20 by the cooling oil.

[0047] In some embodiments, such as Figure 7As shown, the outer surface of the first external oil strip 312C has an oil passage hole 314C, and the angle between the axis of the oil passage hole 314C and the vertical direction is less than a preset acute angle. This allows the cooling oil to drip only from the oil passage hole 314C to the first internal oil strip 311C under the action of gravity. This allows more cooling oil to flow into the first internal oil strip 311C at a lower cost, thereby further improving the cooling effect of the cooling oil on the annular inner wall of the end 21 of the flat wire winding 20.

[0048] In some embodiments, such as Figure 7 As shown, there are multiple intermediate oil guides 313C, each located below the end 21 of the flat wire winding 20, and each intermediate oil guide 313C is spaced apart circumferentially along the first inner oil strip 311C. Meanwhile, each oil passage hole 314C is located above the end 21 of the flat wire winding 20. Above the end 21 of the flat wire winding 20, cooling oil is directly sprayed onto the first outer oil strip 312C. The cooling oil saturation of the first outer oil strip 312C is higher than that of the first inner oil strip 311C. Simultaneously, the cooling oil above the end 21 of the flat wire winding 20 can drip down through the oil passage holes 314C onto the surface of the first inner oil strip 311C under the influence of gravity. Below the end 21 of the flat wire winding 20, cooling oil can be sprayed through the intermediate oil guides 313C... The oil flows between the inner oil strip 311C and the first outer oil strip 312C. Specifically, above the end 21 of the flat wire winding 20, the oil passage 314C keeps the cooling oil saturation of the first inner oil strip 311C and the first outer oil strip 312C balanced. Below the end 21 of the flat wire winding 20, the intermediate oil guide 313C keeps the cooling oil saturation of the first inner oil strip 311C and the first outer oil strip 312C balanced. This can be understood as follows: based on the different forces acting on the cooling oil above and below the end 21 of the flat wire winding 20, and the different cooling oil saturation levels of the first inner oil strip 311C and the first outer oil strip 312C above and below the end 21 of the flat wire winding 20, different flow patterns are used above and below the end 21 of the flat wire winding 20 to allow the cooling oil to flow between the first inner oil strip 311C and the first outer oil strip 312C. This allows the saturation levels of the cooling oil in the first outer oil strip 312C and the first inner oil strip 311C to be kept in dynamic equilibrium at a lower cost. Consequently, the cooling capacity of the first outer oil strip 312C and the first inner oil strip 311C on the annular inner wall and annular outer wall of the end 21 of the flat wire winding 20 is kept in dynamic equilibrium, further improving the uniformity of cooling of the flat wire winding 20 by the cooling oil.

[0049] In some embodiments, the oil absorption rate of the first oil-holding strip 31C increases from the top to the bottom. The oil absorption rate of the first oil-holding strip 31C can be understood as the oil absorption capacity of the first oil-holding strip 31C for cooling oil. Within the first oil-holding strip 31C, cooling oil can flow from the part with a low oil absorption rate to the part with a high oil absorption rate under the action of capillary action. By setting the first oil-holding strip 31C to have an oil absorption rate that increases from the top to the bottom, more cooling oil can flow to the area below the end 21 of the flat wire winding 20 under the action of capillary action, thereby improving the cooling capacity to the area below the end 21 of the flat wire winding 20. It should be noted that the change in the oil absorption rate of the first oil-holding belt 31C can be achieved in any way. For example, the oil absorption rate of the material of the first oil-holding belt 31C can be increased from the top to the bottom of the first oil-holding belt 31C, thus increasing the oil absorption rate of the first oil-holding belt 31C from top to bottom. For example, the oil absorption rate of the material of the first oil-holding belt 31C can also be increased from the top to the bottom of the first oil-holding belt 31C by changing the size of the first oil-holding belt 31C. For example, the thickness of the first oil-holding belt 31C can be increased from the top to the bottom of the first oil-holding belt 31C, thereby increasing the oil absorption rate of the first oil-holding belt 31C from top to bottom.

[0050] In some embodiments, such as Figure 8 As shown, the fourth type of oil-hanging component 30D includes a first oil-hanging rope 31D. The first oil-hanging rope 31D can absorb or delay cooling oil. Along the circumference of the end 21, the first oil-hanging rope 31D is coiled around the surface of the end 21 of the flat wire winding 20. It can be understood that the first oil-hanging rope 31D can keep the cooling oil in contact with the end 21 of the flat wire winding 20 by extending the length of the path of the cooling oil flowing at the end or by absorbing the cooling oil. At the same time, it can bind and fix the cooling oil to the end 21 of the flat wire winding 20 by its own winding, so that no additional fixing components are required. This improves the cooling capacity of the end 21 of the flat wire winding 20 and reduces the manufacturing cost of the stator assembly 1. Meanwhile, when the first oil-coating rope 31D is wound around the flat wire winding 20, it can pass over the end face of the flat wire winding 20. This allows cooling oil inside the first oil-coating rope 31D to seep from the end face of the flat wire winding 20 into the gap between the wire ends of the flat wire winding 20, thereby providing more thorough cooling to the flat wire winding 20. Optionally, when the first oil-coating rope 31D is wound around the end 21 of the flat wire winding 20, it can extend into the gap between the wire ends of the end 21 of the flat wire winding 20. This allows for more reliable binding and fixation to the end 21 of the flat wire winding 20 while providing more thorough cooling to the end 21 of the flat wire winding 20.

[0051] In some embodiments, such as Figure 9 As shown, the first oil-hanging rope 31D is wound to form a mesh structure. That is, the first oil-hanging rope 31D is repeatedly wound to form a mesh structure at the end 21 of the flat wire winding 20, so that more of the first oil-hanging rope 31D are in contact with the end 21 of the flat wire winding 20, thereby making more of the end 21 of the flat wire winding 20 in contact with the cooling oil, thus improving the cooling capacity of the end 21 of the flat wire winding 20. At the same time, the reciprocating mesh structure can also make the first oil-hanging rope 31D more reliably fixed to the end 21 of the flat wire winding 20. Optionally, from the top to the bottom of the first oil-hanging rope 31D, the density of the mesh structure formed by the first oil-hanging rope 31D increases, thereby increasing the oil absorption rate of the mesh structure from the top to the bottom of the first oil-hanging rope 31D. This allows more cooling oil to flow under capillary action to the area below the end 21 of the flat wire winding 20, thereby improving the cooling capacity below the end 21 of the flat wire winding 20.

[0052] In some embodiments, such as Figure 10 As shown, the fifth type of oil-holding component 30E includes: a second oil-holding strip 31E and a second oil-holding rope 32E. The second oil-holding strip 31E can absorb cooling oil and contacts the annular inner wall and / or the annular outer wall of the end 21 of the flat wire winding 20. The second oil-holding rope 32E can absorb cooling oil and is wrapped around the surface of the end 21 of the flat wire winding 20 and the surface of the second oil-holding strip 31E along the circumference of the end 21 of the flat wire winding 20. Thus, the second oil-holding strip 31E is fixed to the end 21 of the flat wire winding 20 by the oil-absorbing second oil-holding rope 32E. In this way, while fixing the second oil-holding strip 31E, more cooling oil is brought into contact with the end 21 of the flat wire winding 20, further improving the cooling capacity of the end 21 of the flat wire winding 20. Optionally, the second oil-coated strip 31E can contact the annular outer wall of the end 21 of the flat wire winding 20, or the annular inner wall of the end 21 of the flat wire winding 20, or simultaneously contact both the annular inner wall and the annular outer wall of the end 21 of the flat wire winding 20.

[0053] In some embodiments, such as Figure 10As shown, the second oil-coating belt 31E includes: a second inner oil-coating belt 311E and a second outer oil-coating belt 312E. The second inner oil-coated band 311E contacts the annular inner wall of the end 21 of the flat wire winding 20 to cool the annular inner wall of the end 21 of the flat wire winding 20. The second outer oil-coated band 312E contacts the annular outer wall of the end 21 of the flat wire winding 20 to cool the annular outer wall of the end 21 of the flat wire winding 20. At the same time, the second inner oil-coated band 311E and the second outer oil-coated band 312E are tied and fixed to the end 21 of the flat wire winding 20 by the second oil-coated rope 32E, which further increases the amount of cooling oil in contact with the end 21 of the flat wire winding 20, thereby further improving the cooling capacity of the end 21 of the flat wire winding 20. At the same time, the second oil-coated rope 32E can also extend the cooling oil into the gap between the wire ends of the flat wire winding 20, thereby further improving the cooling capacity of the end 21 of the flat wire winding 20 and further improving the uniformity of cooling of the end 21 of the flat wire winding 20.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A stator assembly for a flat wire motor, characterized in that, The stator assembly includes: The stator core has slots; A flat wire winding, the flat wire winding comprising a straight section and an end, the straight section being located within the wire groove, and the end extending out of the wire groove; An oil hanger is in contact with the end of the flat wire winding to retain cooling oil between the contact surfaces of the oil hanger and the flat wire winding. The oil hanging component includes a first oil hanging strip, which surrounds the end of the flat wire winding in the circumferential direction of the flat wire winding, and the first oil hanging strip can absorb or delay cooling oil. From the top to the bottom of the first oil-absorbing strip, the oil absorption rate of the first oil-absorbing strip increases.

2. The stator assembly according to claim 1, characterized in that, The first oil-coated strip contacts the annular outer wall of the end of the flat wire winding.

3. The stator assembly according to claim 1, characterized in that, The first oil-coated strip contacts the annular inner wall of the end of the flat wire winding.

4. The stator assembly according to claim 1, characterized in that, The first oil-coated belt includes: The first inner oil strip contacts the annular inner wall of the end of the flat wire winding; The first external oil strip contacts the annular outer wall of the end of the flat wire winding.

5. The stator assembly according to claim 4, characterized in that, The first oil-coated strip also includes: An intermediate oil guide is located between the first inner oil strip and the first outer oil strip, and contacts the first inner oil strip and the first outer oil strip respectively. The intermediate oil guide enables the cooling oil to flow between the first inner oil strip and the first outer oil strip.

6. The stator assembly according to claim 5, characterized in that, The upper part of the first external oil belt has an oil passage hole, and the angle between the axis of the oil passage hole and the vertical direction is less than a preset acute angle.

7. The stator assembly according to claim 6, characterized in that, The intermediate oil guide is provided in multiple parts, and each intermediate oil guide is located below the end, and each intermediate oil guide is arranged at intervals along the circumference of the first inner oil strip.

8. The stator assembly according to claim 1, characterized in that, The thickness of the first oil-coating strip increases from the top to the bottom.

9. The stator assembly according to claim 1, characterized in that, The oil-hanging component also includes: The first oil-holding rope is capable of absorbing or delaying cooling oil, and along the circumference of the end, the first oil-holding rope is wound around the end and the surface of the first oil-holding strip.

10. A stator assembly for a flat wire motor, characterized in that, The stator assembly includes: The stator core has slots; A flat wire winding, the flat wire winding comprising a straight section and an end, the straight section being located within the wire groove, and the end extending out of the wire groove; An oil hanger is in contact with the end of the flat wire winding to retain cooling oil between the contact surfaces of the oil hanger and the flat wire winding. The oil-hanging component includes: The first oil-holding rope is capable of absorbing or delaying the cooling oil, and is wound around the surface of the end along the circumference of the end. The first oil-coated rope is wound to form a mesh structure; From the top to the bottom of the first oil-hanging rope, the density of the mesh structure increases.

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