A cooling structure for the end of a multilayer winding of a flat wire motor

Abstract

The present invention relates to the technical field of multi-layer winding cooling, and in particular to a cooling structure for the end of a multi-layer winding of a flat wire motor. The present invention comprises a casing, wherein an oil collecting tank is arranged at the bottom of the casing, and the oil is input into the first oil inlet hole and the third oil inlet hole through an oil pump and a heat exchanger, and enters the first layer of circulating oil silicone tube, the second layer of circulating oil silicone tube and the third layer of circulating oil silicone tube of the welding end winding and the hairpin end winding; and flows into the oil collecting tank through the oil return hole; through the second oil inlet hole, through the design of the side iron core block and the oil guide ring, the cooling oil flows from the middle to cool the stator iron core; after the cooling oil flows out from both sides, the winding end can also be auxiliary cooled. The present invention can achieve high-efficiency and uniform heat dissipation through the oil circuit design of the cooling oil in the hairpin end, the welding end and the stator, and avoids the formation of a large temperature difference, thereby ensuring the overall cooling effect and improving the use efficiency of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of multi-layer winding cooling, and in particular to a cooling structure for the end of a multi-layer winding of a flat wire motor. Background Art

[0002] With my country's increasing attention to new energy vehicles, new energy vehicles have developed rapidly. When the car is running, the motor will generate a lot of heat. In order to solve the problem of heat absorption, air cooling, water cooling and oil cooling technologies have emerged one after another.

[0003] The rapid development of oil cooling schemes has made the internal cooling of motors more efficient. Existing oil cooling winding ends mostly use spray cooling. Due to the randomness of spray cooling, the ends of the stator multi-layer winding structure will be cooled unevenly, and some windings will overheat. If they are not cooled in time, a large temperature difference will be formed, which will affect the overall cooling effect and further affect the efficiency of the motor. In addition, the design of the spray structure will occupy a large internal space and is more complicated to manufacture.

[0004] In view of the above existing technical problems, we propose a flat wire motor multi-layer winding end cooling structure of the present invention. Summary of the invention

[0005] The object of the present invention is to provide a cooling structure for the ends of multilayer windings of a flat wire motor.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A flat wire motor multilayer winding end cooling structure comprises a casing, a plurality of stator cores are mounted on the circumferential side surface inside the casing, and windings are mounted inside the stator cores, wherein the windings comprise welding end windings and hairpin end windings;

[0008] A rotating shaft is installed inside the housing and at the central axis, and a rotatable rotor is installed outside the rotating shaft;

[0009] An oil collecting tank is provided at the bottom of the casing for storing cooling oil;

[0010] It also includes an oil pump, the input end of which is connected to the oil collecting tank through an oil return pipeline;

[0011] The output end of the oil pump is connected to the oil inlet pipeline, and the end of the oil inlet pipeline away from the oil pump is connected to the first oil inlet hole and the third oil inlet hole;

[0012] A heat exchanger is installed on the oil inlet pipeline to cool the cooling oil passing through;

[0013] The welding end winding and the hairpin end winding are both arranged as follows:

[0014] On one side, a first layer of circulating oil silicone tube, a second layer of circulating oil silicone tube and a third layer of circulating oil silicone tube are fixed in sequence from outside to inside;

[0015] First silicone pipes are fixed at positions corresponding to the first oil inlet hole and the third oil inlet hole inside the housing, and the two first silicone pipes are connected to the first oil inlet hole and the third oil inlet hole respectively;

[0016] The bottom of the first silicone pipe is connected to the first layer of external three-way silicone tube, the bottom of the first layer of external three-way silicone tube is connected to the second layer of external three-way silicone tube, and the bottom of the second layer of external three-way silicone tube is connected to the third layer of external two-way silicone tube;

[0017] The transverse connection ports of the first layer externally connected three-way silicone tube, the second layer externally connected three-way silicone tube and the third layer externally connected two-way silicone tube are respectively connected to a certain interface of the first layer internally connected three-way silicone tube, the second layer internally connected three-way silicone tube and the third layer internally connected three-way silicone tube; the other two interfaces of the first layer internally connected three-way silicone tube, the second layer internally connected three-way silicone tube and the third layer internally connected three-way silicone tube are respectively connected to the top openings of the first layer circulating oil silicone tube, the second layer circulating oil silicone tube and the third layer circulating oil silicone tube;

[0018] The bottoms of the first layer of circulating oil silicone tube, the second layer of circulating oil silicone tube and the third layer of circulating oil silicone tube are also provided with openings; the openings are respectively connected to two interfaces of the inverted third layer internally connected three-way silicone tube, the inverted second layer internally connected three-way silicone tube and the inverted first layer internally connected three-way silicone tube, and the other interfaces of the inverted third layer internally connected three-way silicone tube, the inverted second layer internally connected three-way silicone tube and the inverted first layer internally connected three-way silicone tube are respectively connected to the lateral connection ports of the inverted third layer externally connected two-way silicone tube, the inverted second layer externally connected three-way silicone tube and the inverted first layer externally connected three-way silicone tube;

[0019] The bottom of the inverted third layer of external two-way silicone tube is connected to the top of the inverted second layer of external three-way silicone tube, and the bottom of the inverted second layer of external three-way silicone tube is connected to the top of the inverted first layer of external three-way silicone tube;

[0020] The bottom of the inverted first layer of external three-way silicone tube is left empty;

[0021] A plurality of oil return holes are also provided at the bottom of the casing, and the oil return holes are connected to the oil collecting tank.

[0022] Furthermore, a filter is installed on the oil return pipeline.

[0023] Furthermore, one end of the oil inlet pipeline away from the oil pump is also connected to a second oil inlet hole;

[0024] The stator core includes two symmetrically arranged side core blocks, an oil guide ring is sandwiched between the side core blocks, and the top of the oil guide ring is located directly below the second oil inlet hole.

[0025] Furthermore, the diameter of the first layer of circulating oil silicone tube is less than the diameter of the second layer of circulating oil silicone tube and less than the diameter of the third layer of circulating oil silicone tube.

[0026] Furthermore, the diameter of the oil guide ring is smaller than the diameter of the side iron core block.

[0027] Furthermore, the oil guide ring is provided with a radial oil inlet hole, and the side core block is provided with an axial oil cooling channel; the radial oil inlet hole on the oil guide ring is connected to the axial oil cooling channel on the side core block.

[0028] Furthermore, the radial oil inlet holes and the axial oil cooling channels are arranged in a circumferential row.

[0029] The present invention has at least the following beneficial effects:

[0030] The present invention can achieve high-efficiency and uniform heat dissipation by designing the cooling oil circuits of the hairpin end, the welding end and the inside of the stator, avoiding the formation of a large temperature difference, thereby ensuring the overall cooling effect and improving the use efficiency of the motor.

[0031] The present invention adopts a combination of two groups of side core blocks and oil guide rings to pass cooling oil from the middle to both sides of the stator core to cool the stator core; after the cooling oil flows out from both sides, the winding ends can also be auxiliary cooled, so that the oil can be evenly cooled from the middle to both sides, reducing the problem of temperature imbalance at both ends caused by single-side oil passing.

[0032] The present invention embeds a silicone oil pipe into the hairpin end and the welding end of the winding, allows the cooling oil to flow circumferentially in the oil pipeline, and fully exchanges heat with the winding end; thus, each part of the winding end is cooled evenly, reducing the temperature difference generated at the winding end; and at the same time, reduces the space required inside the motor, making the structure simpler.

[0033] The present invention uses silicone tube material to form various cooling pipes. The silicone tube is a heat-resistant, heat-conductive, and wear-resistant material. It can be well combined with oil cooling to evenly cool the winding end, so that the motor can ensure its working stability during operation. The silicone tube is cheap and convenient to manufacture. In addition, under the action of the thermal grease, the heat conduction is fully utilized to timely exchange heat with the cooling oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0035] Figure 1 It is a schematic diagram of the overall structure;

[0036] Figure 2 is a schematic diagram of the welding end winding;

[0037] Figure 3 It is a schematic diagram of the hairpin end winding;

[0038] Figure 4 This is the front view of the first layer of external three-way silicone tube;

[0039] Figure 5 This is the front view of the second layer of external three-way silicone tube;

[0040] Figure 6 This is the front view of the third layer external two-way silicone tube;

[0041] Figure 7 This is a top view of the first layer of internally connected three-way silicone tube;

[0042] Figure 8 This is a top view of the second layer of internally connected three-way silicone tube;

[0043] Fig. 9 This is a top view of the third layer internally connected three-way silicone tube;

[0044] Fig.10 It is a schematic diagram of the oil inlet and outlet connection mode;

[0045] Fig.11 Schematic diagram of the oil guide ring

[0046] Fig.12 Schematic diagram of the stator core.

[0047] In the figure: 1. oil inlet pipeline; 2. first oil inlet hole; 3. first silicone pipeline; 4. second oil inlet hole; 5. casing; 6. third oil inlet hole; 8. oil guide ring; 9. winding; 10. stator core; 11. rotor; 12. rotating shaft; 13. oil return hole; 15. oil collecting tank; 16. oil return pipeline; 17. filter; 18. oil pump; 19. heat exchanger; 20. radial oil inlet hole; 21. first layer of circulating oil silicone tube; 22. second layer of circulating oil silicone tube; 23. third layer of circulating oil silicone tube; 27. first layer of external three-way silicone tube; 28. first layer of internal three-way silicone tube; 29. ​​second layer of internal three-way silicone tube; 30. third layer of internal three-way silicone tube; 31. second layer of external three-way silicone tube; 32. third layer of external two-way silicone tube; 34. welding end winding; 35. hairpin end winding. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] See also Figure 1 The present invention comprises a housing 5, a plurality of stator cores 10 are mounted on the circumferential side surface inside the housing 5, and a winding 9 is mounted inside the stator core 10;

[0050] A rotating shaft 12 is installed inside the housing 5 and at the central axis, and a rotatable rotor 11 is installed outside the rotating shaft 12 .

[0051] At the bottom of the housing 5, an oil collecting tank 15 is provided, and cooling oil is stored in the oil collecting tank 15; the present invention also includes an oil pump 18, and the input end of the oil pump 18 is connected to the oil collecting tank 15 through an oil return pipeline 16;

[0052] At the top of the housing 5, three oil inlet holes are provided: a first oil inlet hole 2, a second oil inlet hole 4 and a third oil inlet hole 6; the three oil inlet holes are connected to a main inlet, and the main inlet is connected to the output end of the oil pump 18 through an oil inlet pipeline 1;

[0053] A heat exchanger 19 is also installed on the oil inlet pipeline 1 for cooling the cooling oil; and a filter 17 is installed on the oil return pipeline 16 .

[0054] Therefore, under the action of the oil pump 18, the cooling oil enters the return oil pipeline 16 and the oil inlet pipeline 1 from the oil collecting tank 15. The cooling oil entering the oil inlet pipeline 1 is divided into three oil paths through the main inlet and enters the first oil inlet hole 2, the second oil inlet hole 4 and the third oil inlet hole 6 respectively.

[0055] One side of the winding 9 installed inside the stator core 10 is marked as a welding end winding 34 , and the other side is marked as a hairpin end winding 35 .

[0056] The cooling arrangement of the welding end winding 34 is shown in Figure 2 For the cooling arrangement of the hairpin end winding 35, refer to Figure 3 .

[0057] A first silicone pipe 3 is fixed inside the housing 5 at a position corresponding to the first oil inlet hole 2, and a first layer of circulating oil silicone tube 21, a second layer of circulating oil silicone tube 22 and a third layer of circulating oil silicone tube 23 are fixed in sequence from the outside to the inside on one side of the welding end winding 34;

[0058] See also Figure 4-6 , is a front view of the first layer external three-way silicone tube 27, the second layer external three-way silicone tube 31, and the third layer external two-way silicone tube 32;

[0059] See also Figure 7-9 , is a top view of the first layer internally connected three-way silicone tube 28, the second layer internally connected three-way silicone tube 29, and the third layer internally connected three-way silicone tube 30;

[0060] The bottom of the first silicone pipe 3 is connected in sequence to a first layer of external three-way silicone tube 27, a second layer of external three-way silicone tube 31 and a third layer of external two-way silicone tube 32;

[0061] See also Fig.10 The transverse connection ports of the first layer external three-way silicone tube 27, the second layer external three-way silicone tube 31 and the third layer external two-way silicone tube 32 are respectively connected to a certain interface of the first layer internal three-way silicone tube 28, the second layer internal three-way silicone tube 29 and the third layer internal three-way silicone tube 30, and the other two interfaces of the first layer internal three-way silicone tube 28, the second layer internal three-way silicone tube 29 and the third layer internal three-way silicone tube 30 are respectively connected to the top openings of the first layer circulating oil silicone tube 21, the second layer circulating oil silicone tube 22 and the third layer circulating oil silicone tube 23;

[0062] Thereby, the oil supply connection of the welding end winding 34 is realized.

[0063] The bottoms of the first layer of circulating oil silicone tube 21, the second layer of circulating oil silicone tube 22 and the third layer of circulating oil silicone tube 23 are also provided with openings, and the openings are respectively connected to two interfaces of the inverted third layer internally connected three-way silicone tube 30, the inverted second layer internally connected three-way silicone tube 29 and the inverted first layer internally connected three-way silicone tube 28, and the other interfaces of the inverted third layer internally connected three-way silicone tube 30, the inverted second layer internally connected three-way silicone tube 29 and the inverted first layer internally connected three-way silicone tube 28 are respectively connected to the inverted third layer internally connected three-way silicone tube 30, the inverted second layer internally connected three-way silicone tube 29 and the inverted first layer internally connected three-way silicone tube 28. It is connected to the lateral connecting ports of the inverted third-layer external two-way silicone tube 32, the inverted second-layer external three-way silicone tube 31 and the inverted first-layer external three-way silicone tube 27; the bottom of the inverted third-layer external two-way silicone tube 32 is connected to the top of the inverted second-layer external three-way silicone tube 31, and the bottom of the inverted second-layer external three-way silicone tube 31 is connected to the top of the inverted first-layer external three-way silicone tube 27; the bottom of the inverted first-layer external three-way silicone tube 27 is left empty to achieve oil discharge.

[0064] Thereby, the oil outlet connection of the welding end winding 34 is achieved.

[0065] Oil inlet process: the cooling oil entering the first oil inlet hole 2 enters the first silicone pipeline 3, and under the guidance of the first layer external three-way silicone tube 27, the second layer external three-way silicone tube 31, the third layer external two-way silicone tube 32, the first layer internal three-way silicone tube 28, the second layer internal three-way silicone tube 29, and the third layer internal three-way silicone tube 30, enters the first layer circulating oil silicone tube 21, the second layer circulating oil silicone tube 22, and the third layer circulating oil silicone tube 23;

[0066] In one embodiment, the first layer of external three-way silicone tube 27, the second layer of external three-way silicone tube 31, the third layer of external two-way silicone tube 32, the first layer of internal three-way silicone tube 28, the second layer of internal three-way silicone tube 29, and the third layer of internal three-way silicone tube 30 can be compressed and embedded in the gaps between layers of the welding end winding 34, and thermal grease can be added in the gaps to increase thermal conductivity.

[0067] It should be noted that the oil inlet process here is only an oil inlet method, that is, only one oil circuit is cited. This oil inlet method can set multiple identical oil inlet channels around the top according to the flow requirements. Since the oil inlet and outlet methods at the hairpin end and the winding end require the use of three-way and two-way silicone tubes, the two-way and three-way silicone tubes used in this article are all models, indicating a class of things, not the same object.

[0068] Oil discharge process: the oil in the first layer of circulating oil silicone tube 21, the second layer of circulating oil silicone tube 22 and the third layer of circulating oil silicone tube 23 flows out from the bottom of the inverted first layer of external three-way silicone tube 27 under the action of the inverted first layer of external three-way silicone tube 27, the second layer of external three-way silicone tube 31, the third layer of external two-way silicone tube 32, the first layer of internal three-way silicone tube 28, the second layer of internal three-way silicone tube 29 and the third layer of internal three-way silicone tube 30.

[0069] A plurality of oil return holes 13 are also formed at the bottom of the casing 5 , and the oil return holes 13 are connected to the oil collecting tank 15 .

[0070] Under the action of gravity, the cooling oil flowing out from the bottom of the inverted first layer of external three-way silicone tube 27 flows into the oil return hole 13 and enters the oil collecting tank 15 to achieve a cooling cycle for the welding end winding 34.

[0071] The cooling cycle introduced into the hairpin end winding 35 through the third oil inlet hole 6 has the same cooling cycle structure as the welding end winding 34, and will not be described in detail.

[0072] It should be noted that, since the temperature of the end of the multi-layer winding close to the rotating shaft 12 is higher, the diameter of the first layer of circulating oil silicone tube 21 is less than the diameter of the second layer of circulating oil silicone tube 22, which is less than the diameter of the third layer of circulating oil silicone tube 23, so that the winding end close to the inner layer can obtain more cooling oil.

[0073] The present invention only cites a three-layer cooling oil cooling connection structure, and the structure is also applicable to a double-layer or multi-layer structure.

[0074] In one embodiment, the stator core 10 includes two symmetrically arranged side core blocks, an oil guide ring 8 is sandwiched between the side core blocks, and the top of the oil guide ring 8 is located directly below the second oil inlet hole 4.

[0075] It should be noted that the diameter of the oil guide ring 8 should be smaller than the diameter of the two side core blocks.

[0076] Thus, the cooling oil can drip from the second oil inlet hole 4 to the outer periphery of the oil guide ring 8 and flow downward along the outer periphery of the oil guide ring 8 to achieve cooling between the two side core blocks (the middle part of the entire stator core 10).

[0077] See also Figure 11-12 : The oil guide ring 8 is provided with a radial oil inlet hole 20, and the side core block is provided with an axial oil cooling channel 33; the radial oil inlet hole 20 on the oil guide ring 8 is connected to the axial oil cooling channel 33 on the side core block;

[0078] The axial oil cooling channel 33 is a through hole from one side to the other side of the side core block. The radial oil inlet holes 20 and the axial oil cooling channel 33 are arranged in a circle so that the stator core 10 is cooled evenly. The cooling oil enters the axial oil cooling channel 33 through the radial oil inlet holes 20, crosses the side core block, realizes the cooling of the inside, and flows down on the outside to realize the cooling of the side of the side core block (the outside part of the entire stator core 10).

[0079] Therefore, after entering the oil guide ring 8, part of the cooling oil flows in an annular manner to cool the middle part of the stator core 10, and part of the cooling oil enters the axial oil cooling channel 33 on the side core block through the radial oil inlet hole 20. The cooling oil flows from the middle part of the stator core 10 to both sides thereof (i.e., from one side of the side core block close to the oil guide ring 8 to the other side) through the axial oil cooling channel 33, and flows out from the outside of the stator core 10. The outflowing cooling oil has an auxiliary cooling effect on the stator core 10.

[0080] At the same time, the outflowing cooling oil flows into the oil return hole 13 under the action of gravity, and enters the oil collecting tank 15 to achieve circulation.

[0081] The oil collecting tank 15 stores cooling oil. Under the action of the oil pump 18, the cooling oil enters the return oil pipeline 16 from the oil collecting tank 15, and then the cooling oil enters the filter 17. Then the cooling oil enters the heat exchanger 19 through the oil pump 18, and then the cooling oil enters the oil inlet pipeline 1.

[0082] The cooling oil entering the oil inlet pipeline 1 will be divided into the first oil inlet hole 2 , the second oil inlet hole 4 and the third oil inlet hole 6 .

[0083] The cooling oil flowing into the first oil inlet hole 2 enters the welding end winding 34 to cool it, the cooling oil flowing into the third oil inlet hole 6 enters the hairpin end winding 35 to cool it; the cooling oil flowing into the second oil inlet hole 4 enters the stator core 10 to cool it.

[0084] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A flat wire motor multilayer winding end cooling structure, characterized in that: include: A casing, wherein a plurality of stator cores are mounted on the circumferential side surface inside the casing, and windings are mounted inside the stator cores, wherein the windings include welding end windings and hairpin end windings; A rotating shaft is installed inside the housing and at the central axis, and a rotatable rotor is installed outside the rotating shaft; An oil collecting tank is provided at the bottom of the casing for storing cooling oil; It also includes an oil pump, the input end of which is connected to the oil collecting tank through an oil return pipeline; The output end of the oil pump is connected to the oil inlet pipeline, and the end of the oil inlet pipeline away from the oil pump is connected to the first oil inlet hole and the third oil inlet hole; A heat exchanger is installed on the oil inlet pipeline to cool the cooling oil passing through; The welding end winding and the hairpin end winding are both arranged as follows: On one side, a first layer of circulating oil silicone tube, a second layer of circulating oil silicone tube and a third layer of circulating oil silicone tube are fixed in sequence from outside to inside; First silicone pipes are fixed at positions corresponding to the first oil inlet hole and the third oil inlet hole inside the housing, and the two first silicone pipes are connected to the first oil inlet hole and the third oil inlet hole respectively; The bottom of the first silicone pipe is connected to the first layer of external three-way silicone tube, the bottom of the first layer of external three-way silicone tube is connected to the second layer of external three-way silicone tube, and the bottom of the second layer of external three-way silicone tube is connected to the third layer of external two-way silicone tube; The transverse connection ports of the first layer externally connected three-way silicone tube, the second layer externally connected three-way silicone tube and the third layer externally connected two-way silicone tube are respectively connected to a certain interface of the first layer internally connected three-way silicone tube, the second layer internally connected three-way silicone tube and the third layer internally connected three-way silicone tube; the other two interfaces of the first layer internally connected three-way silicone tube, the second layer internally connected three-way silicone tube and the third layer internally connected three-way silicone tube are respectively connected to the top openings of the first layer circulating oil silicone tube, the second layer circulating oil silicone tube and the third layer circulating oil silicone tube; The bottoms of the first layer of circulating oil silicone tube, the second layer of circulating oil silicone tube and the third layer of circulating oil silicone tube are also provided with openings; the openings are respectively connected to two interfaces of the inverted third layer internally connected three-way silicone tube, the inverted second layer internally connected three-way silicone tube and the inverted first layer internally connected three-way silicone tube, and the other interfaces of the inverted third layer internally connected three-way silicone tube, the inverted second layer internally connected three-way silicone tube and the inverted first layer internally connected three-way silicone tube are respectively connected to the lateral connection ports of the inverted third layer externally connected two-way silicone tube, the inverted second layer externally connected three-way silicone tube and the inverted first layer externally connected three-way silicone tube; The bottom of the inverted third layer of external two-way silicone tube is connected to the top of the inverted second layer of external three-way silicone tube, and the bottom of the inverted second layer of external three-way silicone tube is connected to the top of the inverted first layer of external three-way silicone tube; The bottom of the inverted first layer of external three-way silicone tube is left empty; A plurality of oil return holes are also provided at the bottom of the casing, and the oil return holes are connected to the oil collecting tank.

2. A flat wire motor multilayer winding end cooling structure according to claim 1, characterized in that: A filter is installed on the oil return pipeline.

3. The flat wire motor multilayer winding end cooling structure according to claim 1, characterized in that: The end of the oil inlet pipeline away from the oil pump is also connected to a second oil inlet hole; The stator core includes two symmetrically arranged side core blocks, an oil guide ring is sandwiched between the side core blocks, and the top of the oil guide ring is located directly below the second oil inlet hole.

4. The flat wire motor multilayer winding end cooling structure according to claim 1, characterized in that: The diameter of the first layer of circulating oil silicone tube is less than the diameter of the second layer of circulating oil silicone tube and less than the diameter of the third layer of circulating oil silicone tube.

5. The flat wire motor multilayer winding end cooling structure according to claim 3, characterized in that: The diameter of the oil guide ring is smaller than the diameter of the side iron core block.

6. The flat wire motor multilayer winding end cooling structure according to claim 3, characterized in that: The oil guide ring is provided with a radial oil inlet hole, and the side core block is provided with an axial oil cooling channel; the radial oil inlet hole on the oil guide ring is connected to the axial oil cooling channel on the side core block.

7. A flat wire motor multilayer winding end cooling structure according to claim 6, characterized in that: The radial oil inlet holes and the axial oil cooling channels are arranged in a circumferential row.

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