Stator assembly and flat wire motor

Abstract

The application provides a stator assembly and a flat wire motor. The application belongs to the technical field of motors. In the stator assembly provided in the application, the first sub-oil channel formed in the winding slot and the second sub-oil channel formed in the tooth portion are arranged alternately along the axial direction. The winding in the winding slot is fixed by the part of the circumferential wall of the winding slot. At the same time, the cooling liquid can directly contact the winding in the winding slot, so that the heat dissipation performance of the stator assembly can be improved. Moreover, the first oil channel gradually extends from the yoke portion to the tooth portion along the axial direction, which can reduce the influence of the first oil channel on the magnetic circuit and ensure the smooth flow of the oil channel. The oil outlet gradually extends from the tooth portion to the yoke portion along the axial direction, so that the cooling liquid sprayed from the oil outlet can be sprayed on the winding located at the end portion of the stator, thereby further improving the heat dissipation performance of the stator assembly.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically to a stator assembly and a flat wire motor. Background Technology

[0002] As the power density of motors increases, the heat generated during operation also increases. If the heat generated by the motor is not dissipated in time, the overheated motor is prone to runaway or even burnout.

[0003] Meanwhile, there are more and more aluminum-wound motor products on the market. Under the same power conditions, the heat generation of aluminum flat wire is significantly greater than that of copper flat wire. This makes it difficult for existing heat dissipation structure designs to meet the heat dissipation requirements of aluminum-wound motors. Summary of the Invention

[0004] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and to provide a stator assembly and a flat wire motor.

[0005] According to a first aspect of this application, a stator assembly is provided, comprising: a stator core having an oil inlet channel formed on its outer peripheral surface at the center of the axial direction, wherein a plurality of first oil guide channels, a plurality of second oil guide channels, and a plurality of oil outlet channels are formed on both sides of the oil inlet channel in the stator core. The first oil guide channel extends from the yoke to the toothed portion, and the angle between the extension direction of the first oil guide channel and the central axis of the stator core is an acute angle; the second oil guide channel extending axially includes a first sub-oil guide channel and a second sub-oil guide channel that are alternately arranged and connected along the axial direction, the first sub-oil guide channel being formed in the winding groove, and the second sub-oil guide channel being formed in the toothed portion; the oil outlet channel extends from the toothed portion to the yoke, and the angle between the extension direction of the oil outlet channel and the central axis of the stator core is an acute angle; The first oil guide channel is located at the inlet of the yoke and connects with the oil inlet channel, and at the outlet of the toothed part and connects with the second oil guide channel; the oil outlet channel is located at the inlet of the toothed part and connects with the second oil guide channel, and at the outlet of the yokeed part is located on the radial outer side of the winding groove.

[0006] In at least one embodiment, along the direction from the middle of the stator core to the end, the two ends of the middle stack located in the axial middle of the stator core are sequentially provided with a first core stack, a plurality of alternately arranged second core stacks, a third core stack, and a fourth core stack. The first oil guide channel is formed in the first iron core stack; when a winding is provided in the winding slot of the second iron core stack, the peripheral wall of the winding slot and the winding form the first sub-oil guide channel; the second sub-oil guide channel is formed on at least one side of the winding slot in the third iron core stack in the circumferential direction, and each winding slot of the third iron core stack is not connected to the second sub-oil guide channel; the oil outlet channel is formed in the fourth iron core stack.

[0007] In at least one embodiment, both the first core stack and the fourth core stack include a plurality of stacked first laminations, each first lamination having a plurality of first through holes located radially outside the winding groove. In the first core stack, the first through holes of any two adjacent first laminations partially overlap, and the distance between the first through hole of the first lamination closer to the center of the core and the central axis is greater than the distance between the first through hole of the first lamination farther from the center of the core and the central axis. In the fourth core stack, the first through holes of any two adjacent first laminations partially overlap, and the distance between the first through hole of the first lamination closer to the center of the core and the central axis is less than the distance between the first through hole of the first lamination farther from the center of the core and the central axis.

[0008] In at least one embodiment, all the winding slots in the stator core are closed slots, and the end of the fourth core stack away from the second core stack is provided with an end lamination, the material of which the end lamination is made includes organic polymer materials. The end laminations form multiple slots and a second through hole located radially outside the slots. The slots include multiple conductor slots arranged radially. When a winding is provided in the winding slot of the stator core, each conductor slot is for only one conductor to pass through, and the peripheral wall of the conductor slot abuts against the conductor to close the axial ends of the winding slot in the stator core. The second through hole is the outlet of the oil passage.

[0009] In at least one embodiment, insulating paper is provided between the winding and the winding slot, and the axial end of the insulating paper is flush with the axial end of the fourth core stack.

[0010] In at least one embodiment, the insulating paper is formed with a plurality of perforations, and when the insulating paper is inserted into the winding slot, each winding slot of the second core stack is provided with a perforation.

[0011] In at least one embodiment, the peripheral wall of each winding slot of the first iron core stack is isolated from the winding by insulating paper, and the axial ends of the hollow portion are flush with the axial ends of the winding slot of the first iron core stack.

[0012] In at least one embodiment, at least one second lamination is provided at the end of the first core stack away from the middle of the stator core and / or at the end of the fourth core stack near the middle of the stator core. The second lamination has multiple winding grooves and oil reservoirs. The oil reservoirs are located on the radially outer side of the winding grooves and are connected to the winding grooves. The circumferential dimension of the oil reservoirs is larger than that of the winding grooves, and the oil reservoirs extend from the yoke to the tooth.

[0013] In at least one embodiment, the second core stack includes a plurality of stacked third laminations, each third lamination forming a plurality of winding slots. The included angle between the extending directions of two circumferential sidewalls in a winding slot is an acute angle, and the extending directions of the two circumferential sidewalls of the teeth located between any two adjacent winding slots are parallel to each other; and / or, The third core stack includes multiple stacked fourth laminations, each fourth lamination forming multiple winding slots. The two circumferential sidewalls of the winding slots extend in parallel directions, and at least one side of the winding slot has multiple radially arranged oil passages.

[0014] According to a second aspect of this application, a flat wire motor is provided, comprising: a housing, a rotor, and a stator assembly provided in the first aspect above.

[0015] The beneficial technical effects of the technical solution provided in this application include at least the following: In the stator assembly provided in the embodiments of this application, by providing a first sub-oil guide channel formed in the winding slot and a second sub-oil guide channel formed in the tooth portion, which are arranged alternately along the axial direction, the winding in the winding slot is fixed by part of the peripheral wall of the winding slot, while the coolant can directly contact the winding located in the winding slot, thereby improving the heat dissipation performance of the stator assembly.

[0016] Moreover, by setting the first oil guide channel to gradually extend from the yoke to the toothed part along the axial direction, the influence of the first oil guide channel on the magnetic circuit can be reduced, while ensuring the smooth flow of the oil circuit.

[0017] By setting an oil outlet channel that gradually extends axially from the tooth section to the yoke section, the coolant sprayed from the oil outlet channel can be sprayed onto the windings located at the stator end, thereby further improving the heat dissipation performance of the stator assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a stator assembly provided according to an embodiment of this application.

[0019] Figure 2 yes Figure 1 The diagram shows the structure of the stator core in the stator assembly.

[0020] Figure 3 yes Figure 2 A partially enlarged schematic diagram of the stator core shown.

[0021] Figure 4 yes Figure 1 A schematic diagram of the axial cross-section of the stator assembly shown.

[0022] Figure 5 It's the coolant in Figure 4 A schematic diagram of the flow in the structure shown.

[0023] Figure 6 yes Figure 2 The diagram shows the oil circuit of the stator core.

[0024] Figure 7 and Figure 8 They are Figure 6 A schematic diagram of a sub-oil circuit in the oil circuit shown from different perspectives.

[0025] Figure 9 yes Figure 2 The diagram shows the structure of the central laminations stacked in the middle of the stator core.

[0026] Figure 10 yes Figure 2 The diagram shows the structure of the first lamination of the first core stack and the fourth core stack in the stator core.

[0027] Figure 11 yes Figure 2 The diagram shows the structure of the second lamination of the first and fourth core stacks in the stator core.

[0028] Figure 12 yes Figure 10 The first lamination shown and Figure 11 The diagram shows a partially enlarged view of the second lamination after stacking.

[0029] Figure 13 yes Figure 2 The diagram shows the structure of the third lamination of the second core stack in the stator core.

[0030] Figure 14 yes Figure 2 The diagram shows the structure of the fourth lamination of the third core stack in the stator core.

[0031] Figure 15 yes Figure 14 A partially enlarged schematic diagram of the fourth lamination shown.

[0032] Figure 16 This is a partially enlarged schematic diagram of the second and third iron core stacks.

[0033] Figure 17 yes Figure 2 The diagram shows the structure of the end laminations in the stator core.

[0034] Figure 18 yes Figure 17 A partially enlarged schematic diagram of the end laminations shown.

[0035] Figure 19 This is a partially enlarged schematic diagram of the first lamination in the end lamination and the fourth core lamination.

[0036] Figure 20 This is a schematic diagram of the structure of insulating paper in another stator assembly provided according to an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures: 10 - Stator core; 20 - Winding; 100 - Oil inlet passage; 110 - First oil guide passage; 120 - Second oil guide passage; 121 - First sub-oil guide passage; 122 - Second sub-oil guide passage; 130 - Oil outlet passage; 140 - First oil reservoir; 150 - Second oil reservoir; 101 - Winding groove; 102 - Tooth; 11-Middle stack; S1-Middle stamping; 12-First iron core stack; S2-First lamination; 103-First through hole; S3-Second lamination; 104-Oil reservoir; 13 - Second core stack; S4 - Third lamination; 14 - Third core stack; S5 - Fourth lamination; 105 - Oil passage hole; 15-Fourth core stack; S6 - End lamination; S61 - Wire groove; S611 - Conductor groove; S62 - Second via; 30 - Insulating paper; 31 - Perforated part. Detailed Implementation

[0038] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0039] Unless otherwise specified, the terms radial, axial, and circumferential as used below refer to the radial, axial, and circumferential directions of the stator.

[0040] Reference Figures 1 to 20 This paper introduces the stator assembly and flat wire motor provided in the embodiments of this application.

[0041] This application provides a stator assembly, including a stator core 10 and a flat wire winding 20. Part of the flat wire winding 20 is located in the winding slot within the stator core 10, and the remaining part protrudes from the end of the stator core 10 to form a welded end winding and a crown end winding, respectively.

[0042] like Figures 4-5As shown, the stator core 10 includes an annular oil inlet channel 100. Multiple first oil guide channels 110, multiple second oil guide channels 120, and multiple oil outlet channels 130 are formed on both axial sides of the oil inlet channel 100. The oil inlet channel 100 is interconnected with the first oil guide channels 110, the second oil guide channels 120, and the oil outlet channels 130. The number of first oil guide channels 110, the number of second oil guide channels 120, and the number of oil outlet channels 130 are all equal, and the number of first oil guide channels 110, the number of second oil guide channels 120, and the number of oil outlet channels 130 on both axial sides of the oil inlet channel 100 are equal. In this embodiment, the number of first oil guide channels 110, the number of second oil guide channels 120, and the number of oil outlet channels 130 are all equal to twice the number of winding slots in the stator core 10.

[0043] like Figure 5 and Figure 6 As shown, the coolant enters the first oil guide channel 110 through the oil inlet channel 100, and then enters the second oil guide channel 120, so that the coolant can directly contact and cool the flat wire winding 20 located in the winding slot. Then it enters the oil outlet channel 130 and finally sprays out from the radial outside of the end winding, so that the sprayed coolant can directly cool the end winding.

[0044] To help readers intuitively understand the flow of coolant in the stator core 10, such as Figure 5 As shown, the red arrows indicate the approximate flow direction of the coolant; however, this is not present in the actual product. Figure 5 The arrow shown.

[0045] The oil inlet channel 100 is an annular oil channel surrounding the outer circumferential surface of the stator core 10. Specifically, the outer circumferential surface of the axial center of the stator core 10 is recessed in the direction close to the central axis, and is enclosed with the housing (not shown in the figure) to form an annular oil inlet channel 100.

[0046] The angle between the extension direction of the first oil guide channel 110 and the central axis of the stator core 10 is an acute angle, that is, the first oil guide channel 110 is an inclined oil channel, so that the first oil guide channel 110 gradually extends from the yoke of the stator core 10 to the tooth of the stator core 10.

[0047] Compared to vertical oil channels extending radially, the first oil channel 110 in this embodiment is configured as an inclined oil channel, which reduces the impact of the first oil channel 110 on the lamination magnetic circuit and helps to ensure the performance of the stator. Moreover, the inclined first oil channel 110 helps to ensure the consistency of coolant flow rate and ensures coolant flow.

[0048] The second oil guide channel 120 extends axially and includes a plurality of interconnected first sub-oil guide channels 121 and a plurality of second sub-oil guide channels 122, such as... Figure 7and Figure 8 As shown, the first sub-oil guide channel 121 and the second sub-oil guide channel 122 are arranged alternately along the axial direction.

[0049] The first sub-oil guide channel 121 is formed within the winding slot of the stator core 10. Specifically, the first sub-oil guide channel 121 is formed by the sidewall of the winding slot and the winding, thereby allowing the coolant to directly contact the winding. The circumferential width of the first sub-oil guide channel 121 gradually increases in the direction from the radially inward to the radially outward, thereby making the magnetic flux density of the stator teeth more uniform.

[0050] The second sub-oil guide channel 122 is formed in the teeth of the stator core 10. Circumferentially, the second sub-oil guide channel 122 is located on the side of the tooth near the winding slot. Radially, the second sub-oil guide channel 122 is located in the region of the tooth near the radial outer side, thereby enabling a more uniform magnetic flux density in the stator teeth.

[0051] The structure of the first sub-oil guide channel 121 and the second sub-oil guide channel 122 will be explained in detail later in conjunction with the stamping process, and will not be repeated here.

[0052] The angle between the extension direction of the oil outlet 130 and the central axis of the stator core 10 is an acute angle, meaning that the oil outlet 130 is also an inclined oil outlet, thus allowing the oil outlet 130 to gradually extend from the tooth portion of the stator core 10 to the yoke portion of the stator core 10. The beneficial effects of setting the oil outlet 130 as an inclined oil outlet are described above in relation to the first guide oil outlet 110, and will not be repeated here.

[0053] As explained above, by setting the first sub-oil guide channel 121 and the second sub-oil guide channel 122 alternately arranged along the axial direction of the second oil guide channel 120, while ensuring that the winding in the winding slot is fixed by part of the peripheral wall of the winding slot, the coolant can directly contact the winding located in the winding slot, thereby improving the heat dissipation performance of the stator assembly.

[0054] Both the first oil guide channel 110 and the oil outlet channel 130 are inclined oil channels, which reduces their impact on the magnetic circuit while ensuring smooth oil flow. Moreover, the coolant is finally sprayed out from the radially outer side of the end winding, allowing the sprayed coolant to directly cool the end winding, which can further improve the heat dissipation performance of the stator assembly.

[0055] The stator core 10 in the stator assembly of this application will be described in detail below with reference to specific silicon steel laminations.

[0056] The stator core 10 includes at least one central stack 11 located in the axial middle section. Figure 3(Two are shown in the figure). The middle stack 11 is provided with a first iron core stack 12, a plurality of second iron core stacks 13 and a plurality of third iron core stacks 14 and a fourth iron core stack 15 arranged alternately, and at least one end stack S6.

[0057] like Figure 2 and Figure 3 As shown, in order to form the oil inlet channel 100, the diameter of the central stack 11 is smaller than the diameter of the other core stacks. The central stack 11 is formed by at least one central lamination S1, which includes a plurality of winding grooves 101 and a plurality of teeth 102, such as... Figure 9 As shown, the winding groove 101 in the middle lamination S1 is a closed groove.

[0058] Multiple first oil guide channels 110 are formed in the first iron core stack 12, arranged circumferentially. For example... Figure 10 As shown, the yoke of the first lamination S2 has a first through hole 103, and the first through hole 103 is located on the radial outer side of the winding groove 101, thereby reducing the influence of the first through hole 103 on the magnetic circuit and ensuring the uniformity of the magnetic flux density of the yoke.

[0059] In this embodiment, the first through holes 103 of any two adjacent first laminations S2 are interconnected and their first through holes 103 partially overlap along the axial direction. The distance between the first through hole 103 of the first lamination S2 near the middle of the stator core 10 and the central axis of the stator core 10 is greater than the distance between the first through hole 103 of the first lamination S2 far from the middle of the stator core 10 and the central axis of the stator core 10. This makes the first oil passage 110 formed by the multiple interconnected first through holes 103 an inclined oil passage.

[0060] like Figure 11 and Figure 12 As shown, a second lamination S3 (only one is shown in the figure) is also provided at one end of the first core stack 12 away from the middle of the stator core 10. In addition to the winding groove 101 and the tooth 102, the second lamination S3 also has multiple oil storage grooves 104. The oil storage grooves 104 are connected to the winding groove 101 and are located on the radially outer side of the winding groove 101, extending from the yoke to the tooth, and the circumferential dimension of the oil storage groove 104 is larger than the circumferential dimension of the winding groove 101.

[0061] like Figure 12 As shown, the oil reservoir 104 is connected to the first through hole 103 of the adjacent first lamination S2 in the first core stack 12. In this embodiment, the oil reservoir 104 serves to contain coolant, such as... Figure 7 and Figure 8 As shown, the oil reservoir 104 in the oil circuit forms a first oil reservoir 140. By setting the first oil reservoir 140, the pressure of the coolant flowing to the second oil guide channel 120 can be increased, which is beneficial to ensure the flow rate of the coolant and ensure the smooth flow of the coolant.

[0062] like Figure 3 As shown, on one side of the first core stack 12, the second core stack 13 and the third core stack 14 are arranged alternately (four second core stacks 13 and three third core stacks 14 are shown in the figure).

[0063] The second core stack 13 includes multiple stacked third laminations S4, each third lamination S4 including multiple winding slots 101 and multiple teeth 102. For example... Figure 13 and Figure 16 As shown, the angle between the extension directions of the two circumferential sidewalls in the winding groove 101 of the third lamination S4 is an acute angle, which makes the circumferential dimension of the winding groove 101 in the third lamination S4 larger than the circumferential dimension of the winding groove 101 in other laminations (especially the fourth lamination S5 described later). This makes the circumferential wall of the winding groove 101 in the third lamination S4 and the winding form the first sub-oil guide channel 121 located in the winding groove 101, so that the coolant can directly contact the winding.

[0064] In this embodiment, each winding slot 101 in the third lamination S4 forms two first sub-oil guide channels 121 arranged circumferentially, and the two first sub-oil guide channels 121 are separated by the winding.

[0065] In the third lamination S4, the two circumferential sidewalls of the tooth 102 located between any two adjacent winding slots 101 extend in parallel directions to ensure the uniformity of the magnetic flux density of the stator teeth.

[0066] The third core stack 14 includes multiple stacked fourth laminations S5, each fourth lamination S5 including multiple winding slots 101 and multiple teeth 102. For example... Figures 14 to 16 As shown, the two circumferential sidewalls in the winding groove 101 extend in parallel directions. When the winding is installed in place, the inner wall of the winding groove 101 in the fourth lamination S5 serves to fix the winding and prevent the winding 20 from shifting in the circumferential direction.

[0067] like Figure 3 As shown, by arranging the second core stack 13 and the third core stack 14 alternately along the axial direction, the problem of winding 20 moving can be prevented, which helps to improve the NVH performance of the motor.

[0068] The fourth lamination S5 has oil passages 105 formed on both sides of the toothed portion 102 near the winding groove 101 for forming the second sub-oil guide channel 122. Specifically, as shown... Figure 15 and Figure 16 As shown, multiple radially arranged oil passages 105 are formed on both sides of the winding groove 101 in the fourth lamination S5, and the oil passages 105 connected in the axial direction in the third core stack 14 form the second sub-oil guide channel 122.

[0069] like Figure 15 As shown, for a row of oil passage holes 105, the diameter of the oil passage holes 105 gradually decreases along the radial inner direction in order to ensure the uniformity of the effective width of the tooth 102 in the radial direction, so as to ensure the uniformity of the magnetic flux density of the tooth and the performance of the motor.

[0070] like Figure 3 As shown, in this embodiment, the number of second iron core stacks 13 is greater than the number of third iron core stacks 14, so that a second iron core stack 13 is provided at both ends of the axial direction of the third iron core stack 14, to ensure that the first sub-oil guide channel 121 is connected to the outlet of the first oil guide channel 110, and the first sub-oil guide channel 121 is also connected to the inlet of the oil outlet channel 130. Figure 7 and Figure 8 As shown, the first sub-oil guide passage 121 located at both ends of the axial direction in each sub-oil passage can play the role of liquid storage to ensure the pressure of coolant flow.

[0071] In this embodiment, the winding grooves 101 in the middle lamination S1, the first lamination S2, the second lamination S3, and the fourth lamination S5 all have the same specifications, and the axial projections of the winding grooves 101 in each lamination completely overlap. Furthermore, the winding grooves 101 in each lamination are closed grooves, thereby ensuring the flow of coolant within the winding grooves 101 and preventing coolant leakage from the winding grooves.

[0072] In this embodiment, the fourth core stack 15 has a plurality of oil outlet channels 130 arranged along the axial direction. The fourth core stack 15 includes a plurality of stacked first laminations S2. The structure of the first laminations S2 is as described above and will not be repeated here.

[0073] In the fourth core stack 15, the first through holes 103 of any two adjacent first laminations S2 are interconnected and their first through holes 103 partially overlap along the axial direction. The distance between the first through hole 103 of the first lamination S2 near the middle of the stator core 10 and the central axis of the stator core 10 is less than the distance between the first through hole 103 of the first lamination S2 far from the middle of the stator core 10 and the central axis of the stator core 10. This makes the oil outlet 130 formed by multiple interconnected first through holes 103 an inclined oil outlet, and the outlet of the oil outlet 130 is located radially outside its inlet.

[0074] Optionally, a second lamination S3 is provided at one end of the fourth core stack 15 near the middle of the stator core 10. The structure of the second lamination S3 is as described above and will not be repeated here. The oil reservoir 104 of the second lamination S3 in the fourth core stack 15 serves to contain coolant, such as... Figure 7 and Figure 8As shown, a second oil storage chamber 150 is formed in the oil storage tank 104 in the oil circuit. By setting the second oil storage chamber 150, the pressure of the coolant flowing to the oil outlet 130 can be increased, which is beneficial to ensure the flow rate of the coolant and ensure the smooth flow of the coolant.

[0075] like Figure 3 As shown, the fourth core stack 15 has an end plate S6 at the end away from the second core stack 13. In this embodiment, the end plate S6 serves to seal the axial end of the winding slot 101 in the stator core 10, preventing coolant leakage and ensuring that coolant can only be sprayed out from the outlet of the oil outlet 130.

[0076] like Figure 17 and Figure 18 As shown, the end laminations S6 form multiple circumferentially spaced grooves S61, which correspond one-to-one with the winding grooves 101 of the stator core 10. Figure 19 As shown, the circumferential and radial dimensions of the wire groove S61 are smaller than those of the winding groove 101 in the first lamination S2, so as to seal the axial port of the winding groove 101.

[0077] The wire groove S61 includes multiple conductor grooves S611 arranged radially. Each conductor groove S611 can only accommodate one conductor from the flat wire winding 20. That is, the shape and size of the conductor groove S611 are the same as the shape and size of the conductor, so that the peripheral wall of the conductor groove S611 abuts against the conductor, thereby fixing the conductor.

[0078] Optionally, such as Figure 18 As shown, each wire slot S61 includes six conductor slots S611. The number of conductor slots S611 is the same as the number of layers of the flat wire winding 20. Those skilled in the art can determine the number of conductor slots S611 in each wire slot S61 based on the actual number of layers of the flat wire winding.

[0079] When the end lamination S6 is provided, the outlet of the oil passage 130 is also formed at the end lamination S6. Specifically, as shown in Figure 17 and Figure 18 As shown, a second through hole S62 is also formed on the radial outer side of each wire groove S61. The second through hole S62 is the outlet of the oil outlet 130. Since the end plate S6 blocks the axial port of the winding groove 101, the coolant can only be sprayed out from the second through hole S62.

[0080] To improve the sealing between the conductor slot S611 and the conductor, no insulating paper is provided between the conductor slot S611 and the conductor in this embodiment. Therefore, to ensure the insulation between the conductor slot S611 and the conductor, the end lamination S6 should be made of an insulating material. For example, the material used to manufacture the end lamination S6 includes organic polymer materials. By providing an insulating end lamination S6, the insulation performance of the stator assembly can also be improved.

[0081] In this embodiment, an insulating paper 30 is provided between the winding 20 and the winding slot 101. The structure of the insulating paper 30 is as follows: Figure 20 As shown.

[0082] In order to avoid interference between the insulating paper 30 and the end stack S6, the axial end of the insulating paper 30 is flush with the axial end of the fourth iron core stack 15 in this embodiment. That is, the axial length of the insulating paper 30 is equal to the sum of the axial lengths of all the middle stack 11, the first iron core stack 12, the second iron core stack 13, the third iron core stack 14 and the fourth iron core stack 15, so that the axial end of the insulating paper 30 abuts against one side of the wire groove S61 in the end stack S6.

[0083] Those skilled in the art will understand that, in order to ensure the insulation performance between the winding 20 and the stator core 10, each winding slot 101 of the stator core 10 is provided with an insulating paper 30, which is a cylindrical structure formed by winding an insulating sheet. In this embodiment, since the first sub-oil guide channel 121 is formed by the periphery of the winding slot 101 in the third lamination S4 and the winding, the insulating paper 30 is provided with a perforated portion 31 to ensure that the coolant can directly contact the winding.

[0084] like Figure 20 As shown, a plurality of hollow portions 31 are formed on the insulating paper 30 along the axial direction. The number of hollow portions 31 is the same as the number of the first sub-oil guide channels 121, so that after the insulating paper 30 is inserted into the winding groove 101, the hollow portions 31 are aligned with the first sub-oil guide channels 121.

[0085] Furthermore, the two axial ends of the hollow portion 31 are flush with the two axial ends of the winding groove 101 of the second iron core stack 13 to ensure the volume of the first sub-oil guide channel 121, and to ensure that the peripheral wall of each winding groove 101 in the third iron core stack 14 is completely separated from the winding by the insulating paper, thus ensuring the insulation performance.

[0086] Those skilled in the art will understand that the flat wire winding 20 of the stator assembly provided in the various embodiments of this application includes, but is not limited to, flat wires such as copper flat wires, aluminum flat wires, and copper-aluminum composite flat wires.

[0087] Based on the same inventive concept, another embodiment of this application provides a flat wire motor, which includes a housing, a rotor disposed within the housing, and a stator assembly provided in any of the above embodiments.

[0088] The beneficial effects of this flat wire motor are described above in the section on stator assemblies, and will not be repeated here.

[0089] It should be understood that the above embodiments and some aspects or features thereof can be appropriately combined.

[0090] This application has at least one of the following advantages: (i) In the stator assembly provided in this embodiment, by setting the first sub-oil guide channels and the second sub-oil guide channels arranged alternately along the axial direction, the windings in the winding slots are fixed by part of the peripheral wall of the winding slots, while the coolant can directly contact the windings located in the winding slots, thereby improving the heat dissipation performance of the stator assembly. Both the first oil guide channel and the oil outlet channel are inclined oil channels, which reduces their impact on the magnetic circuit and ensures smooth flow of the oil. Moreover, the coolant is finally sprayed out from the radially outer side of the end windings, so that the sprayed coolant can directly cool the end windings, further improving the heat dissipation performance of the stator assembly.

[0091] (ii) In the stator assembly provided in this embodiment, by forming a first oil reservoir 140 in the oil circuit, the pressure of the coolant flowing to the second oil guide passage 120 can be increased, which helps to ensure the flow rate of the coolant and ensures the smooth flow of the coolant. Furthermore, by forming a second oil reservoir 150 in the oil circuit, the pressure of the coolant flowing to the oil outlet passage 130 can be increased.

[0092] (iii) In the stator assembly provided in this embodiment, by setting insulated end laminations, not only can the conductor be fixed, but the sealing performance can also be improved, so that the coolant can only be sprayed out from the oil outlet, ensuring the pressure of the coolant at the oil outlet, and improving the insulation performance of the stator assembly.

[0093] Of course, this application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application without departing from the scope of this application.

Claims

1. A stator assembly, comprising: A stator core with an oil inlet channel formed on the outer circumferential surface at the center of the axial direction, characterized in that multiple first oil guide channels, multiple second oil guide channels, and multiple oil outlet channels are formed on both sides of the oil inlet channel in the stator core. The first oil guide channel extends from the yoke to the toothed portion, and the angle between the extension direction of the first oil guide channel and the central axis of the stator core is an acute angle; the second oil guide channel extending axially includes a first sub-oil guide channel and a second sub-oil guide channel that are alternately arranged and connected along the axial direction, the first sub-oil guide channel being formed in the winding groove, and the second sub-oil guide channel being formed in the toothed portion; the oil outlet channel extends from the toothed portion to the yoke, and the angle between the extension direction of the oil outlet channel and the central axis of the stator core is an acute angle; The first oil guide channel is located at the inlet of the yoke and communicates with the oil inlet channel, and at the outlet of the toothed part and communicates with the second oil guide channel; the oil outlet channel is located at the inlet of the toothed part and communicates with the second oil guide channel, and at the outlet of the yokeed part is located on the radial outer side of the winding groove. Along the direction from the middle of the stator core to the end, at both ends of the middle stack located in the axial middle of the stator core, a first core stack, a plurality of alternately arranged second core stacks, a third core stack, and a fourth core stack are sequentially arranged; the first oil guide channel is formed in the first core stack; when a winding is provided in the winding slot of the second core stack, the peripheral wall of the winding slot and the winding form the first sub-oil guide channel; the second sub-oil guide channel is formed on at least one side of the winding slot in the third core stack in the circumferential direction, and each winding slot of the third core stack is not connected to the second sub-oil guide channel; the oil outlet channel is formed in the fourth core stack; Both the first core stack and the fourth core stack include a plurality of stacked first laminations, each first lamination forming a plurality of first through holes, and the first through holes being located radially outside the winding groove; in the first core stack, the first through holes of any two adjacent first laminations partially overlap, and the distance between the first through hole of the first lamination closer to the center of the core and the central axis is greater than the distance between the first through hole of the first lamination farther from the center of the core and the central axis; in the fourth core stack, the first through holes of any two adjacent first laminations partially overlap, and the distance between the first through hole of the first lamination closer to the center of the core and the central axis is less than the distance between the first through hole of the first lamination farther from the center of the core and the central axis.

2. The stator assembly according to claim 1, characterized in that, All the winding slots in the stator core are closed slots. The fourth core stack is provided with an end plate at the end away from the second core stack. The end plate is made of organic polymer materials. The end laminations form multiple slots and a second through hole located radially outside the slots. The slots include multiple conductor slots arranged radially. When a winding is provided in the winding slot of the stator core, each conductor slot allows only one conductor to pass through, and the peripheral wall of the conductor slot abuts against the conductor to close the axial ends of the winding slot in the stator core. The second through hole is the outlet of the oil passage.

3. The stator assembly according to claim 2, characterized in that, An insulating paper is provided between the winding and the winding slot, and the axial end of the insulating paper is flush with the axial end of the fourth iron core stack.

4. The stator assembly according to claim 3, characterized in that, The insulating paper has multiple perforations, and when the insulating paper is inserted into the winding slot, each winding slot of the second iron core stack is provided with one of the perforations.

5. The stator assembly according to claim 4, characterized in that, The peripheral wall of each winding slot of the first iron core stack is isolated from the winding by the insulating paper, and the axial ends of the hollow portion are flush with the axial ends of the winding slot of the first iron core stack.

6. The stator assembly according to claim 1, characterized in that, At least one second lamination is provided at one end of the first core stack away from the middle of the stator core and / or at one end of the fourth core stack near the middle of the stator core; The second lamination has multiple winding grooves and oil reservoirs. The oil reservoirs are located radially outside the winding grooves and communicate with the winding grooves. The circumferential dimension of the oil reservoirs is larger than the circumferential dimension of the winding grooves, and the oil reservoirs extend from the yoke to the tooth.

7. The stator assembly according to claim 1, characterized in that, The second core stack includes a plurality of stacked third laminations, each third lamination forming a plurality of winding slots. The included angle between the extending directions of two circumferential sidewalls in a winding slot is an acute angle, and the extending directions of the two circumferential sidewalls of the teeth located between any two adjacent winding slots are parallel to each other; and / or, The third core stack includes a plurality of stacked fourth laminations, each fourth lamination having a plurality of winding grooves. The two circumferential sidewalls of the winding grooves extend in parallel directions, and at least one side of the winding groove has a plurality of radially arranged oil passage holes.

8. A flat wire motor, characterized in that, include: The housing, the rotor, and the stator assembly according to any one of claims 1-7.

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