Motor stator structure and manufacturing method thereof

Abstract

The invention discloses a motor stator structure, a manufacturing method and a motor. The motor stator structure comprises fourth blade sets arranged at the two ends of the motor stator structure, and oil injection channels are formed in the fourth blade sets. The middle blade set is arranged between the fourth blade set, an oil passing channel is formed in the middle blade set, and the oil passing channel is communicated with the oil spraying channel; the middle blade group comprises a plurality of first blade groups, at least two second blade groups and at least one third blade group which are arranged at intervals, a plurality of oil duct holes are formed in the circumferential direction of each first blade, a second notch is formed in the outer circumference of each second blade, and a first notch is formed in the outer circumference of each third blade. According to the technical scheme, the oil path structure of the stator is simplified, the transmission path of cooling oil is shortened, and the cost is reduced; and the optimal oil path runner pressure drop is obtained while the contact area between the blades in the stator structure and the cooling oil is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor stator structure and a manufacturing method thereof. Background Art

[0002] As new energy vehicles and other applications have higher and higher requirements for motor power density, the power density of passenger car motors must reach >4kW / kg in 2025, and the torque density of commercial vehicles must reach >19Nm / kg. Under the indicators of high power density and high torque density, the temperature rise of the motor is the most difficult link to overcome. With the development trend of drive integration, today's two-in-one, three-in-one, multi-in-one, integrated hybrid systems, and hub motors also put forward higher requirements on the heat dissipation capacity of the system. Therefore, oil cooling technology with higher heat dissipation efficiency has become a research hotspot. However, the existing oil cooling structure has problems such as long transmission path and low heat dissipation efficiency, and the matching tolerance between the components affects the thermal resistance of the transmission path.

[0003] Furthermore, in the prior art, the stator oil cooling structure generally includes an oil injection ring disposed at the end, which further increases the processing and assembly process and cost. Summary of the invention

[0004] The embodiment of the present invention provides a motor stator structure and a manufacturing method thereof, so as to solve the problems of the existing motor stator, such as long cooling medium transmission path, low heat dissipation efficiency, large thermal resistance, complex process and high cost.

[0005] According to an embodiment of one aspect of the present invention, a motor stator structure is provided, comprising:

[0006] A fourth blade group is arranged at both ends of the motor stator structure, and an oil injection channel is arranged on the fourth blade group; and,

[0007] An intermediate blade group is arranged between the fourth blade groups, and an oil passage is formed on the intermediate blade group, and the oil passage is communicated with the oil injection passage;

[0008] The intermediate blade group includes: a plurality of first blade groups arranged at intervals, at least two second blade groups and at least one third blade group, wherein a plurality of oil passage holes are arranged in the circumferential direction of the first blade, a second notch is arranged on the outer circumference of the second blade, and a first notch is arranged on the outer circumference of the third blade;

[0009] The oil passage of the intermediate blade group is configured as follows: the cooling oil enters the oil passage from the first notch in the middle of the motor stator structure, is radially divided into left and right paths, and flows into the second notch through the oil channel holes on the first blade group toward both ends of the motor stator structure, and after passing through the second notch, continues to flow radially into left and right paths to the next second notch or to the oil injection passage.

[0010] In some embodiments, each of the fourth blade groups is formed by more than two fourth blade subgroups, each of the fourth blade subgroups is formed by more than one fourth blades being aligned and stacked, and at least one type of oil injection hole is provided on the fourth blade;

[0011] The fourth blade groups are rotated and staggered with each other, so that the oil injection channel formed by the oil injection holes faces the stator winding.

[0012] In some embodiments, the intermediate blade group includes a plurality of oil chamber combinations stacked sequentially from the end to the middle of the intermediate blade group, each of the oil chamber combinations includes a first blade group and a second blade group, and at least one third blade group is provided in the middle of the intermediate blade group;

[0013] The blade group includes more than one blades which are aligned and stacked; and the blade assembly is formed by more than two blade groups which are rotated and staggered and stacked.

[0014] In some embodiments, a supplementary notch is provided on the second blade.

[0015] In some embodiments, the first notch on the third blade group and the second notch on the adjacent second blade group are circumferentially spaced 180 degrees apart, and the second notches on two adjacent second blade groups are circumferentially spaced 180 degrees apart.

[0016] In some embodiments, the middle portion of the intermediate blade group includes: one or more third blade subgroups, and the first blade group or the third blade subgroup is disposed on both sides of each third blade subgroup.

[0017] According to another aspect of the present invention, an embodiment provides a method for manufacturing a motor stator structure, the manufacturing method comprising:

[0018] Step a: stacking a fourth blade group including more than one fourth blade, wherein the fourth blade is provided with an oil injection hole;

[0019] Step b: stacking at least one fourth blade group staggered from each other, wherein the oil injection holes of each fourth blade group form an oil injection channel;

[0020] The intermediate step c is to form an intermediate blade group, wherein the intermediate blade group includes a plurality of first blade groups, at least two second blade groups and at least one third blade group, wherein the third blade group is arranged in the middle of the oil chamber combination, wherein a plurality of oil passage holes are arranged in the circumferential direction of the first blade, a second notch is arranged on the outer circumference of the second blade, and a first notch is arranged on the outer circumference of the third blade;

[0021] The oil passage hole and the second notch form an oil passage, and the oil passage is connected to the oil injection passage;

[0022] Step d: Repeat steps ab.

[0023] In some embodiments, the intermediate step c comprises:

[0024] Step e: stacking a first blade group including at least one first blade;

[0025] Step f: stacking at least one first blade group that is rotationally staggered relative to the previous first blade group;

[0026] Step g: stacking a second blade subgroup including at least one second blade.

[0027] In some embodiments, the step c further comprises:

[0028] Step h: stacking the first blade groups that are rotated and staggered relative to the previous first blade group;

[0029] Step i: repeat step h at least once;

[0030] Step j: stacking a third blade group including at least one third blade;

[0031] Step k: stacking a first blade group, wherein the first blade group does not rotate relative to the previous first blade group;

[0032] Step 1: stacking a third blade group, wherein the third blade group does not rotate relative to the previous third blade group;

[0033] Step m: stacking a first blade group without rotating relative to the previous first blade group;

[0034] Step n: stacking the first blade groups that are rotated and staggered relative to the previous first blade group;

[0035] Step o: Repeat step n at least once.

[0036] According to another aspect of the present invention, an embodiment provides a motor, the motor includes a motor stator structure, and the motor stator structure is the motor stator structure according to any one of the above-mentioned embodiments, or the motor stator structure is manufactured according to the manufacturing method according to any one of the above-mentioned embodiments.

[0037] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0038] The motor stator structure provided in the embodiment of the present invention eliminates the oil injection rings at both ends of the stator, simplifies the oil circuit structure of the stator, reduces the transmission path of the cooling oil, reduces the cost, and obtains the optimal oil circuit flow channel pressure drop while maintaining the contact area with the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of a motor stator structure provided by some embodiments of the present invention;

[0040] Figure 2 is a schematic structural diagram of a first blade in a motor stator structure provided by some embodiments of the present invention;

[0041] Figure 3 is a schematic structural diagram of a second blade in a motor stator structure provided by some embodiments of the present invention;

[0042] Figure 4 is a schematic structural diagram of a third blade in a motor stator structure provided by some embodiments of the present invention;

[0043] Figure 5 is a schematic structural diagram of a fourth blade in a motor stator structure provided by some embodiments of the present invention;

[0044] Figure 6 is a schematic structural diagram of a fluid domain within a motor stator structure provided by some embodiments of the present invention;

[0045] Figure 7 is a schematic diagram of the structure of the oil injection hole in the fourth blade group provided in some embodiments of the present invention;

[0046] Figure 8 It is a schematic diagram of a top view structure of an oil cavity assembly in a motor stator structure provided by some embodiments of the present invention (partial);

[0047] Fig. 9 It is a schematic flow chart of a method for manufacturing a motor stator structure provided in some embodiments of the present invention.

[0048] Notes on the attached drawings:

[0049] 1. First blade, 11. Stator yoke, 12. Wire embedding groove, 13. Stator tooth, 14. Oil channel hole, 15. Support rib; 2. Second blade, 21. Second notch, 22. Supplementary notch; 3. Third blade, 31. First notch, 32. Oil channel hole; 4. Fourth blade, 41. Oil injection hole; 5. Inlet pipe; 6. Oil passage (oil chamber); 7. Support rib area; 8. Oil injection channel. DETAILED DESCRIPTION

[0050] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0051] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0053] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention.

[0054] See also Figure 1-8 As shown, an embodiment of the present invention discloses a motor stator structure, comprising:

[0055] A fourth blade group is arranged at both ends of the motor stator structure, and an oil injection channel 8 is arranged on the fourth blade group; and,

[0056] An intermediate blade group is arranged between the fourth blade groups, and an oil passage 6 is formed on the intermediate blade group, and the oil passage 6 is communicated with the oil injection passage 8;

[0057] The intermediate blade group includes: a plurality of first blade groups arranged at intervals, at least two second blade groups and at least one third blade group, wherein a plurality of oil passage holes 14 are arranged in the circumference of the first blade, a second notch 21 is arranged on the outer circumference of the second blade, and a first notch 31 is arranged on the outer circumference of the third blade; wherein a blade group refers to one or more blades formed by aligning the notches or oil passage holes thereon, and a blade group is formed by rotating and staggering more than two groups to form an oil passage (oil chamber) or an oil injection passage.

[0058] The oil passage of the intermediate blade group is configured as follows: cooling oil enters the oil passage from the first notch 31 in the middle of the motor stator structure, and is radially divided into left and right paths, and flows into the second notch 21 after passing through the oil cavity formed by the oil passage hole 14 on the first blade group toward both ends of the motor stator structure, and then continues to flow radially into left and right paths after passing through the second notch 21 to the next second notch 21 or to the oil injection channel 8. The interval angle between the first notch 31 and the second notch 21 is not specifically limited, and the preferred value range is 120-180 degrees.

[0059] It should be noted that the blades mentioned above may be punched sheets, which are generally punched from silicon steel sheets into punched sheets of different specifications to be suitable for use with motor stators of different powers. Figure 2 As shown, it is a circular ring type, and a plurality of oil passage holes 14 are arranged in the circumferential direction thereof, and the oil passage holes 14 can be optionally circular or square; the structure of the first blade 1 further includes a stator yoke 11, a wire embedding groove 12, a stator tooth portion 13 and a support rib 15, and the support rib 15 and the oil passage holes 14 are arranged at intervals on the same diameter of the first blade 1, and the oil passage holes 14 constitute a part of the oil passage 8.

[0060] The structure of the second blade 2 is shown in Figure 3 As shown, it includes a second notch 21 arranged on the outer circumference. In order to increase the pressure drop of the oil passage 6, a supplementary notch 22 can also be arranged on the circumference. Figure 3 As shown, the structure of the third blade 3 is shown in Figure 4 As shown, the third blade includes a first notch 31 arranged on the outer circumference, and a plurality of oil passage holes 32 are also arranged on a certain diameter of the inner circumference.

[0061] Combination Figure 5 As shown, the fourth blade 4 is provided with a plurality of fuel injection holes 41, and the types of the fuel injection holes are different. Optionally, the fuel injection holes of different types are provided at different diameters of the fourth blade 4, and the shapes and sizes of the fuel injection holes of different types may be the same or different.

[0062] Combination Figure 6 and Figure 7 As shown, the fourth blade group is configured as follows: through the rotational superposition of a plurality of fourth blade groups, an oil injection channel with an oil injection direction toward the nail winding is formed.

[0063] In summary, the motor stator structure provided in this embodiment eliminates the need for oil injection rings at both ends of the stator by arranging a fourth blade group at both ends, on which an oil injection channel formed by oil injection holes is provided, thereby simplifying the oil circuit structure of the stator, reducing the transmission path of the cooling oil, and reducing the cost; and, by arranging three types of first blade groups, second blade groups, and third blade groups in the middle blade group, the optimal oil circuit flow pressure drop is obtained while increasing or at least maintaining the contact area between the blades and the cooling oil in the stator structure.

[0064] In some optional embodiments, each of the fourth blade groups is formed by more than two fourth blade subgroups, each of the fourth blade subgroups is formed by more than one fourth blades aligned and stacked, and at least one fuel injection hole 41 is provided on the fourth blade, which can be specifically one fuel injection hole, or two or more different fuel injection holes, so as to form a better injection inclination angle.

[0065] The fourth blade groups are rotated and staggered with each other, so that the oil injection channel formed by the oil injection holes faces the stator winding.

[0066] Optionally, the fuel injection holes have the same size and shape, and different fuel injection holes are arranged on different diameters of the fourth blade. Of course, the shapes and sizes of the fuel injection holes may also be different. Fuel injection hole designs that can achieve the same or similar functions are all within the protection scope of this embodiment.

[0067] Combination Figure 7 As shown, the oil injection channel 8 composed of three types of oil injection holes with different diameters on the fourth blade faces the direction of the stator winding to achieve oil injection cooling of the stator winding.

[0068] In some embodiments, the intermediate blade group includes a plurality of oil chamber combinations stacked sequentially from the end to the middle of the intermediate blade group, each of the oil chamber combinations includes a first blade group and a second blade group, and at least one third blade group is provided in the middle of the intermediate blade group;

[0069] The blade group includes more than one blades which are aligned and stacked; and the blade assembly is formed by more than two blade groups which are rotated and staggered and stacked.

[0070] According to this embodiment, the intermediate blade group is actually composed of two structures. One structure is at least one oil chamber combination forming an oil passage. Each oil chamber combination includes a first blade group and a second blade group, including a second notch and oil passage holes 14 arranged on both radial sides of the first blade group and connected to the second notch. The honeycomb structure formed is as shown in FIG. Figure 8 shown.

[0071] A plurality of oil chambers are combined and superimposed in the central axial direction of the stator structure to form an annular oil passage 6. The oil passage 6 is configured as follows: Figure 6 A portion of the fluid domain is shown.

[0072] It should be noted that when designing the first second blade group adjacent to the fourth blade group at the end, attention should be paid to forming a specific angle between the second blade group and the outermost injection hole of the fourth blade group: Figure 5 The structure of the fourth blade shown has different densities of the oil injection holes, which have a gradual change trend. The oil injection holes at one place are relatively sparse, and then gradually become denser towards both sides. Therefore, during assembly, the oil injection holes at the sparse part are located at the lowest section of the stator structure, and the densest part is set at the highest end. The second notch of the second blade closest to the fourth blade group is 180 degrees away from the oil injection holes at the densest part, so that it is convenient to use the gravity of the oil to cool the stator winding, thereby improving the cooling efficiency.

[0073] Another structure of the middle blade group is a cooling oil inflow structure, which is composed of a third blade group. The cooling oil flows into the above-mentioned fluid domain through the inlet pipe 5 and the first notch 9 on the third blade group.

[0074] It should be pointed out that according to Figure 6 In the flow domain, the support rib area 7 formed by the support rib 15 is a hollow structure, and the oil passage 6 constitutes a solid body of the fluid domain, that is, the fluid domain refers to the area that the fluid in the stator structure can occupy.

[0075] In some embodiments, the second blade 2 is provided with a supplementary notch 22. By providing the supplementary notch 22, a small amount of oil in the oil passage 6 flows into the next passage through the supplementary notch 22, thereby improving the pressure drop in the oil passage 6.

[0076] In some embodiments, the first notch on the third blade group and the second notch on the adjacent second blade group are circumferentially spaced 180 degrees apart, and the second notches on two adjacent second blade groups are circumferentially spaced 180 degrees apart.

[0077] It should be pointed out that the spacing angles between the above-mentioned different notches are only a preferred manner. The 180-degree spacing is set to make the coolant flow and heat dissipation efficiency more uniform, and spacings other than 180 degrees are also within the protection scope of the present invention.

[0078] In addition, the present invention also provides an embodiment of a cooling oil inflow structure, in which the middle portion of the intermediate blade group includes: more than one third blade group, and the first blade group is respectively arranged on both sides of each third blade group. Of course, the third blade group can also be arranged on both sides of each third blade group. The requirement for arranging the first blade group or the third blade group on both sides of each third blade group is that the oil channel hole is staggered with the support rib.

[0079] In this embodiment, two third blade groups are provided to obtain two first gaps, and the inlet pipe 5 is connected through the first gaps to increase the coolant flow of the stator structure, thereby obtaining better cooling efficiency and effect.

[0080] According to another aspect of the present invention, an embodiment provides a method for manufacturing a motor stator structure, the manufacturing method comprising:

[0081] Step a: stacking a fourth blade group including more than one fourth blade, wherein the fourth blade is provided with an oil injection hole 41;

[0082] Step b: stacking at least one fourth blade group staggered from each other, wherein the oil injection holes of each fourth blade group form an oil injection channel 8;

[0083] Through step a and step b, an oil injection structure is formed at one end of the stator structure.

[0084] Intermediate step c, forming an intermediate blade group, the intermediate blade group includes a plurality of first blade groups, at least two second blade groups and at least one third blade group, the third blade group is arranged in the middle of the oil chamber combination, wherein a plurality of oil passage holes 14 are arranged in the circumference of the first blade, a second notch 21 is arranged on the outer circumference of the second blade, and a first notch 31 is arranged on the outer circumference of the third blade;

[0085] The oil passage hole 14 and the second notch 21 form an oil passage 6, and the oil passage 6 is connected to the oil injection passage 8;

[0086] Through step c, a middle blade group having a structure of first blades, second blades and third blades is formed, and an oil passage is formed in the middle blade group.

[0087] Step d: Repeat steps ab.

[0088] Through step d, the oil injection structure at the other end is formed.

[0089] According to the above-mentioned embodiments, a structure with oil injection channels at both ends can be obtained, which saves an oil injection ring, and by providing an intermediate blade group with three blade structures, the area through which the cooling oil passes is increased, thereby improving the cooling efficiency of the stator structure, and by providing a second notch and other structures, the pressure drop of the cooling oil in the oil passage is improved.

[0090] In some embodiments, the intermediate step c comprises:

[0091] Step e: stacking a first blade group including at least one first blade;

[0092] Step f: stacking at least one first blade group that is rotationally staggered relative to the previous first blade group;

[0093] Step g: stacking a second blade subgroup including at least one second blade.

[0094] Through step eg, an oil chamber combination can be formed, including the oil channel hole and the second notch, and the oil passage 6 in the fluid domain is mainly formed by connecting n oil chamber combinations.

[0095] In some embodiments, step c further comprises:

[0096] Step h: stacking the first blade groups that are rotated and staggered relative to the previous first blade group;

[0097] Step i: repeat step h at least once;

[0098] Step j: stacking a third blade group including at least one third blade, and optionally, the first notch of the third blade group may be spaced 180° from the second notch;

[0099] Step k: stacking a first blade group, wherein the first blade group does not rotate relative to the previous first blade group;

[0100] Step 1: stacking a third blade group, wherein the third blade group does not rotate relative to the previous third blade group;

[0101] Step m: stacking a first blade group without rotating relative to the previous first blade group;

[0102] Step n: stacking the first blade groups that are rotated and staggered relative to the previous first blade group;

[0103] Step o: Repeat step n at least once.

[0104] According to this embodiment, a structure is actually used to obtain the cooling oil flowing in the middle of the middle blade group. This embodiment includes two first notches, which flow toward the two ends of the stator structure respectively, thereby improving the cooling efficiency and effect.

[0105] According to another aspect of the present invention, an embodiment provides a motor, the motor includes a motor stator structure, and the motor stator structure is the motor stator structure according to any one of the above-mentioned embodiments, or the motor stator structure is manufactured according to the manufacturing method according to any one of the above-mentioned embodiments.

[0106] In summary, the embodiments of the present invention can achieve the following beneficial effects:

[0107] The motor stator structure provided in the above-mentioned embodiment of the present invention eliminates the oil injection rings at both ends of the stator, simplifies the oil circuit structure of the stator, reduces the transmission path of the cooling oil, reduces the cost, and obtains the optimal oil circuit flow channel pressure drop while increasing or maintaining the contact area between the stator structure and the cooling oil. Specific embodiments

[0109] In this embodiment, the fourth blades are arranged at both ends of the stator core and are designed by a specific lamination method to achieve a spray ring-free design; the overall oil flow channel pressure drop is greatly reduced by adding a supplementary gap channel in the second blade; the blade stacking method is designed to form a structure in which two radial paths are divided into left and right paths from the middle of the stator core to meet at a 180° diagonal angle and then enter the next radial oil cavity on both sides, and the structure is repeated N times to divide into two radial paths into left and right paths to meet at a 180° diagonal angle and then enter the next radial oil cavity on both sides, and the number of oil cavities is 2N+1 times;

[0110] The stacking method of the oil cooling structure proposed in this embodiment includes:

[0111] Step 1: Stack a certain number of fourth leaves (at least 1 leaf);

[0112] Step 2: Rotate a certain angle and stack a certain number of fourth leaves (at least 1 leaf);

[0113] Step 3: Repeat step 2 a certain number of times;

[0114] Among them, steps 1-3 form a stepped oil injection channel at one end of the motor stator structure by stacking fourth blades that are staggered from each other.

[0115] Step 4: stacking a certain number of first leaves;

[0116] Step 5: stacking the first blades rotated by a certain angle and a certain number relative to the first blades in the previous stack;

[0117] Step 6: Repeat step 5 a certain number of times;

[0118] Step 7: Stack a certain number of second blades (at least 1) and make them form a specific angle with the injection hole feature of the fourth blade; Figure 5The structure of the fourth blade shown in the figure has relatively sparse oil injection holes at one place, and then gradually becomes denser towards both sides. During assembly, the oil injection holes at the sparse part are located at the lowest section of the stator structure, and the densest part is set at the highest end. The second notch of the second blade closest to the fourth blade group is spaced 180 degrees from the oil injection holes at the densest part, so as to facilitate the use of the gravity of the oil to cool the winding and improve the cooling efficiency.

[0119] Step 8: Repeat steps 4-7 a certain number of times;

[0120] Among them, step 4-8 forms N oil chambers in oil chamber 2N+1, that is, a combination of multiple oil chambers in the above embodiments is formed, and the blade where the oil chamber formed in step 4-8 is located is located on one side of the middle of the stator structure.

[0121] Step 9: stacking the first blades rotated by a certain angle and a certain number relative to the first blades in the previous stack;

[0122] Step 10: Repeat step 9 a certain number of times;

[0123] Step 11: stack a certain number of third leaves, and make the first notch of the third leaves form an angle of 180° with the second notch of the second leaves;

[0124] Step 12: stacking a certain number of first blades without rotating relative to the previous stack of first blades;

[0125] Step 13: stacking a certain number of third leaves without rotating relative to the last stack of third leaves;

[0126] Step 14: stacking a certain number of first blades without rotating relative to the previous stack of first blades;

[0127] Step 15: stacking the first blades rotated by a certain angle and a certain number relative to the first blades in the previous stack;

[0128] Step 16: Repeat step 15 a certain number of times (the number is the same as step 10);

[0129] Among them, step 9-16 forms the "1" in the oil cavity "2N+1", that is, forms the structure for the cooling oil to flow into as described in the above embodiment, which is located in the middle of the stator structure.

[0130] Step 17: stack a certain number of second leaves (at least one) without rotating the second leaves relative to the previous stack;

[0131] Step 18: stacking the first blades rotated by a certain angle and a certain number relative to the first blades in the previous stack;

[0132] Step 19: Repeat step 17 a certain number of times (the number is the same as step 6);

[0133] Step 20: Repeat steps 17-19 a certain number of times (the number is the same as step 8);

[0134] Among them, the above steps 17-20 form another "N" in the oil cavity "2N+1", which is located on the other side of the middle of the stator structure.

[0135] Step 21: stacking a certain number of fourth leaves (at least one) without rotating relative to the previous stack of fourth leaves;

[0136] Step 22: Rotate the fourth leaves at a certain angle to stack a certain number of leaves (at least 1 leaf);

[0137] Step 23: Repeat step 22 a certain number of times (the number is the same as step 3)

[0138] Among them, steps 21-23 form a stepped oil injection channel at the other end of the stator structure.

[0139] It should be noted that the rotational staggering of various blades in the embodiment of the present invention is not the only implementation path, and the same purpose can also be achieved by increasing the types of blades, etc. Therefore, other equivalent methods that can achieve the same function, such as increasing the types of blades, are also within the protection scope of the present invention. Specifically, the rotational staggering of the four types of blades can be replaced as follows: 1. The rotation of the first blade group can be replaced by other equivalent methods that can stagger its oil channel holes and support ribs; 2. The rotation of the second blade group can be replaced by other equivalent methods that obtain a suitable second notch position to achieve connectivity between adjacent oil passages; 3. The rotation of the third blade group can be replaced by an equivalent method that staggers the oil channel holes and support ribs, and obtains a suitable first notch position to adapt to a suitable inlet pipe position; 4. The rotation of the fourth blade group can be replaced by other equivalent methods that form a suitable injection channel angle.

[0140] It should be noted that although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A motor stator structure, characterized in that: The motor stator structure comprises: A fourth blade group is arranged at both ends of the motor stator structure, and an oil injection channel is arranged on the fourth blade group; and, An intermediate blade group is arranged between the fourth blade groups, and an oil passage is formed on the intermediate blade group, and the oil passage is communicated with the oil injection passage; The intermediate blade group includes: a plurality of first blade groups arranged at intervals, at least two second blade groups and at least one third blade group, wherein a plurality of oil passage holes are arranged in the circumferential direction of the first blade, a second notch is arranged on the outer circumference of the second blade, and a first notch is arranged on the outer circumference of the third blade; The oil passage of the intermediate blade group is configured as follows: the cooling oil enters the oil passage from the first notch in the middle of the motor stator structure, is radially divided into left and right paths, and flows into the second notch through the oil channel holes on the first blade group toward both ends of the motor stator structure, and after passing through the second notch, continues to flow radially into left and right paths to the next second notch or to the oil injection passage.

2. The motor stator structure according to claim 1, characterized in that: Each of the fourth blade groups is formed by more than two fourth blade subgroups, each of the fourth blade subgroups is formed by more than one fourth blades being aligned and stacked, and at least one type of oil injection hole is provided on the fourth blade; The fourth blade groups are rotated and staggered with each other, so that the oil injection channel formed by the oil injection holes faces the stator winding.

3. The motor stator structure according to claim 1, characterized in that: The intermediate blade group includes a plurality of oil chamber combinations stacked in sequence from the end to the middle of the intermediate blade group, each of the oil chamber combinations includes a first blade group and a second blade group, and at least one third blade group is arranged in the middle of the intermediate blade group; The blade group includes more than one blade stacked in an aligned manner; and the blade assembly includes more than two blade groups stacked in a rotated and staggered manner.

4. The motor stator structure according to claim 3, characterized in that: The second blade is provided with a supplementary notch.

5. The motor stator structure according to claim 3 or 4, characterized in that: The first notch on the third blade group and the second notch on the adjacent second blade group are circumferentially spaced 180 degrees apart, and the second notches on two adjacent second blade groups are circumferentially spaced 180 degrees apart.

6. The motor stator structure according to any one of claims 1 to 4, characterized in that: The middle portion of the intermediate blade group includes: more than one third blade group, and the first blade group or the third blade group is respectively arranged on both sides of each third blade group.

7. A method for manufacturing a motor stator structure, characterized in that: The manufacturing method comprises: Step a: stacking a fourth blade group including more than one fourth blade, wherein the fourth blade is provided with an oil injection hole; Step b: stacking at least one fourth blade group staggered from each other, wherein the oil injection holes of each fourth blade group form an oil injection channel; The intermediate step c is to form an intermediate blade group, wherein the intermediate blade group includes a plurality of first blade groups, at least two second blade groups and at least one third blade group, wherein the third blade group is arranged in the middle of the oil chamber combination, wherein a plurality of oil passage holes are arranged in the circumferential direction of the first blade, a second notch is arranged on the outer circumference of the second blade, and a first notch is arranged on the outer circumference of the third blade; The oil passage hole and the second notch form an oil passage, and the oil passage is connected to the oil injection passage; Step d: Repeat steps ab.

8. The manufacturing method according to claim 7, characterized in that: The intermediate steps include: Step e: stacking a first blade group including at least one first blade; Step f: stacking at least one first blade group that is rotationally staggered relative to the previous first blade group; Step g: stacking a second blade subgroup including at least one second blade.

9. The manufacturing method according to claim 8, characterized in that: The intermediate steps also include: Step h: stacking the first blade groups that are rotated and staggered relative to the previous first blade group; Step i: repeat step h at least once; Step j: stacking a third blade group including at least one third blade; Step k: stacking a first blade group, wherein the first blade group does not rotate relative to the previous first blade group; Step 1: stacking a third blade group, wherein the third blade group does not rotate relative to the previous third blade group; Step m: stacking a first blade group without rotating relative to the previous first blade group; Step n: stacking the first blade groups that are rotated and staggered relative to the previous first blade group; Step o: Repeat step n at least once.

10. A motor, comprising a motor stator structure, characterized in that: The motor stator structure is a motor stator structure according to any one of claims 1-6, or a motor stator structure manufactured by a manufacturing method according to any one of claims 7-9.

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