Stator assembly and flat wire motor

Abstract

This application relates to the technical field of electric motors, and discloses a stator assembly and a flat wire motor. The stator core of the stator assembly includes a first oil guide channel formed in the yoke, a second oil guide channel formed in the toothed portion, and a plurality of third oil guide channels formed at the ends and extending radially. The first oil guide channel communicates with an annular oil channel, and the first end of the third oil guide channel communicates with the annular oil channel, and the second end communicates with the second oil guide channel. The second oil guide channel includes an oil reservoir located in the middle of the stator core and oil outlets located at both axial ends. The oil outlets are located radially inner to the oil reservoir, and the second end of the third oil guide channel is located radially outer to the oil reservoir. This achieves direct heat dissipation of the yoke, toothed portion, and end windings at both ends of the stator core, improving the heat dissipation efficiency of the stator assembly. The oil reservoir in the second oil guide channel provides sufficient pressure for the cooling oil ejected from the oil outlets of the second oil guide channel, ensuring that the ejected cooling oil can be sprayed onto the windings, thereby ensuring heat dissipation efficiency.

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] In recent years, with the development of motors towards higher speeds, the power density of motors has also gradually increased, which has led to an increase in the heat generated by motors during operation. In particular, how to achieve efficient heat dissipation of stator components is an urgent problem to be solved in this field.

[0003] Moreover, with the increasing demand for cost reduction in auxiliary drive motors in the new energy vehicle sector, more and more manufacturers are replacing copper flat wires with aluminum flat wires in their auxiliary drive motors. Under the same power conditions, the heat generation of aluminum flat wires is significantly increased, which makes it difficult for the existing stator assembly heat dissipation structure design to meet the heat dissipation requirements of aluminum wire auxiliary drive motors.

[0004] The applicant proposed a stator assembly in Chinese patent publication number CN219477694U, which can provide efficient cooling for the stator within a limited space. However, with the industry's continuous pursuit of motor power density, there is still room for improvement in this solution. Summary of the Invention

[0005] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and provide a stator assembly and flat wire motor with high heat dissipation efficiency.

[0006] According to a first aspect of this application, a stator assembly is provided, comprising: a housing and a stator disposed within the housing, the stator including a stator core and end windings disposed at both ends of the stator core, an oil guide ring being fitted to one axial end of the stator core, the oil guide ring surrounding the outer periphery of the end windings, and an oil distribution hole being formed on the oil guide ring, the outer peripheral wall of the oil guide ring forming an annular oil channel with the housing and the stator core, and the inner peripheral wall of the oil guide ring forming a first chamber with the housing;

[0007] The outer casing has an axially extending oil inlet and outlet channel on its peripheral wall. The oil inlet channel and the annular oil channel are connected, and both the annular oil channel and the oil outlet channel are connected to the first chamber.

[0008] The stator core includes a plurality of first oil guide channels formed in the yoke and extending axially, a plurality of second oil guide channels formed in the toothed portion and extending axially, and a plurality of third oil guide channels formed at the ends of the stator core and extending radially. The first oil guide channels are connected to the annular oil channel, the first end of the third oil guide channel is connected to the annular oil channel, and the second end is connected to the second oil guide channel. The second oil guide channel includes an oil storage cavity located in the middle of the stator core and oil outlets located at both ends axially. The oil outlets are located radially inside the oil storage cavity, and the second end of the third oil guide channel is located radially outside the oil storage cavity.

[0009] In at least one embodiment, when the stator core is installed in place, the first oil guide channel is located only in the upper half of the stator core, and the second oil guide channel is distributed circumferentially throughout the entire stator core.

[0010] In the upper half of the stator core, the first and second oil guide channels are arranged alternately along the circumference.

[0011] In at least one embodiment, the stator core includes a main body stack, a first lamination, and a second lamination. Along the direction from the middle of the stator core to the end, at least one first lamination and at least one second lamination are sequentially provided at the first end of the main body stack, and at least two second laminations are provided at the second end of the main body stack. Furthermore, among all the second laminations located at the second end, any two adjacent second laminations are misaligned circumferentially.

[0012] The first and second oil guide channels both penetrate the main body stack, the first and second laminations along the axial direction; the first lamination has multiple first strip holes extending from the yoke to the teeth, and the first strip holes, the main body stack, and the second lamination adjacent to the first lamination enclose and form a third oil guide channel; the yoke of the second lamination adjacent to the first lamination has a drainage hole communicating with the first strip holes.

[0013] In at least one embodiment, the first lamination further includes a plurality of first oil guide holes formed on the yoke and a plurality of second oil guide holes formed on the teeth. The first oil guide holes are used to form a first oil guide channel, and the second oil guide holes are used to form an oil outlet at one end of the second oil guide channel.

[0014] The first strip hole and the second oil guide hole are arranged in a radial pair, and the second oil guide hole is located radially inside the first strip hole.

[0015] In at least one embodiment, the main body stack includes a plurality of third laminations stacked along the axial direction, the yoke of the third laminations forming a plurality of third oil guide holes arranged circumferentially, at least two teeth of the third laminations forming second strip holes, the third oil guide holes being used to form a first oil guide channel, and the second strip holes being used to form an oil storage cavity.

[0016] In the third lamination, at least one tooth without a second strip hole is provided between any two adjacent teeth with a second strip hole in the circumferential direction, and a third oil guide hole is formed in the yoke adjacent to the tooth without a second strip hole in the radial direction.

[0017] In at least one embodiment, along the axial direction, the radial inner end of the first strip hole is connected to the radial outer end of the second strip hole, and the second oil guide hole is connected to the radial inner end of the second strip hole.

[0018] In at least one embodiment, the first strip-shaped hole includes two circumferentially opposite sides, both sides being parallel to the sidewall of the toothed portion on which the first strip-shaped hole is formed; and / or,

[0019] The second strip-shaped hole includes two opposing sides along the circumferential direction, both sides being parallel to the sidewall of the tooth portion on which the second strip-shaped hole is formed.

[0020] In at least one embodiment, the teeth of the second lamination are formed with a first oil outlet hole, which is used to form an oil outlet.

[0021] With the stator core installed in place, the yoke of the upper half of the second lamination has multiple injection hole groups arranged circumferentially, and at least one injection hole in the injection hole group forms the oil injection port of the first oil guide channel.

[0022] In at least one embodiment, the injection port group includes a first injection port and a second injection port, wherein the distance between the first injection port and the central axis of the second lamination is greater than the distance between the second injection port and the central axis of the second lamination.

[0023] In the second lamination located at the first end of the main body stack, the first oil injection hole forms the oil inlet of the first oil guide channel, and the second oil injection hole forms the drainage hole;

[0024] The second end of the main body stack is provided with two second punches, and the first oil injection hole of one second punch is axially connected to the second oil injection hole of the other second punch, and the second oil injection hole is located axially outside the first oil injection hole.

[0025] According to a second aspect of this application, a flat wire motor is provided, including at least one stator assembly provided in the first aspect.

[0026] In the stator assembly provided in this application embodiment, the heat dissipation performance of the stator core can be improved by forming oil guide channels in both the yoke and toothed portions of the stator core. The oil guide rings, in conjunction with the stator core, enable heat dissipation from the end windings at both ends, thereby improving the heat dissipation efficiency of the stator assembly.

[0027] Furthermore, by setting an oil storage chamber in the second oil guide channel, sufficient pressure can be provided for the cooling oil sprayed from the oil outlet of the second oil guide channel, ensuring that the sprayed cooling oil can be sprayed onto the winding to ensure heat dissipation efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a stator assembly provided according to the first embodiment of this application, axially cut along the first oil guide passage.

[0029] Figure 2 This is a schematic diagram of the stator assembly provided according to the first embodiment of this application, axially cut along the second oil guide passage.

[0030] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0031] Figure 4 This is a schematic diagram of the stator and oil guide ring in the stator assembly provided in the first embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the stator in the stator assembly provided in the first embodiment of this application.

[0033] Figure 6 yes Figure 5 A schematic diagram of the stator from another perspective.

[0034] Figure 7 yes Figure 5 The image shows a side view of the stator after the end windings have been removed.

[0035] Figure 8 yes Figure 7 A partially enlarged schematic diagram of the stator shown.

[0036] Figure 9 yes Figure 5 The diagram shows an exploded view of the stator core in the stator.

[0037] Figure 10 This is a schematic diagram of the stator core after the second lamination has been removed from the liquid inlet end of the stator assembly provided in the first embodiment of this application.

[0038] Figure 11 yes Figure 10 A partially enlarged schematic diagram of the stator core shown.

[0039] Figure 12 This is a schematic diagram of the first lamination of the stator core in the stator assembly provided in the first embodiment of this application.

[0040] Figure 13 yes Figure 12 A partially enlarged schematic diagram of the first lamination shown.

[0041] Figure 14 This is a schematic diagram of the second lamination of the stator core in the stator assembly provided in the first embodiment of this application.

[0042] Figure 15 This is a schematic diagram of the third lamination of the stator core in the stator assembly provided in the first embodiment of this application.

[0043] Figure 16 yes Figure 15 A partially enlarged schematic diagram of the third lamination shown.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10-Outer casing; 11-Oil inlet passage; 12-Oil outlet passage;

[0046] 20-Stator; 21-Stator core; 211-Main body stack; H-Weld bead; 22-End winding;

[0047] 201 - First oil guide passage; 201a - Injector port; 201b - Liquid inlet; 202 - Second oil guide passage; 202a - Oil reservoir; 202b - Oil outlet; 203 - Third oil guide passage;

[0048] 30 - Oil guide ring; 31 - Oil distribution hole;

[0049] 101 - Annular oil passage; 102 - First chamber;

[0050] S1 - First punch; S11 - First strip hole; S12 - First oil guide hole; S13 - Second oil guide hole;

[0051] S2 - Second lamination; S21 - First oil outlet; S22 - Injection hole group; S221 - First oil injection hole; S222 - Second oil injection hole;

[0052] S3 - Third punch; S31 - Third oil guide hole; S32 - Second strip hole. Detailed Implementation

[0053] 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.

[0054] Unless otherwise specified, the radial, axial, and circumferential directions referred to below are all with reference to the radial, axial, and circumferential directions of the motor. The stator assembly or stator core in its installed position as described below refers to the position of the motor in its normal operating state, in which the motor's axis is horizontal.

[0055] The following reference Figures 1 to 15 This application provides a detailed description of the stator assembly and flat wire motor provided in the embodiments of this application.

[0056] The stator assembly includes a housing 10, a stator 20, and an oil guide ring 30, both of which are located inside the housing 10.

[0057] The stator 20 includes a stator core 21 and a flat wire winding. The flat wire winding is located in the winding slot inside the stator core 21, and the remaining part protrudes from the end of the stator core 21 to form an end winding 22.

[0058] The oil guide ring 30 is located only at one axial end of the stator core 21 and is sleeved on the outer periphery of the winding 22 at that end. No oil guide ring 30 is provided at the other axial end of the stator core 21. The outer peripheral wall of the oil guide ring 30, together with the outer shell 10 and one end of the stator core 21, forms an annular oil channel 101. The annular oil channel 101 surrounds the oil guide ring 30, and the inner peripheral wall of the oil guide ring 30, together with the outer shell 10, forms a first chamber 102. An oil distribution hole 31 is provided in the upper half of the oil guide ring 30, allowing the annular oil channel 101 to communicate with the first chamber 102.

[0059] The outer casing 10 has an axially extending oil inlet channel 11 and an oil outlet channel 12 formed on its peripheral wall. With the stator assembly installed, the oil inlet channel 11 is at the top and the oil outlet channel 12 is at the bottom. The oil inlet channel 11 communicates with the annular oil passage 101, and the oil outlet channel 12 communicates with the first chamber 102, so that a portion of the cooling oil output from the cooling system can enter the annular oil passage 101 and the first chamber 102 through the oil inlet channel 11, and be transported back to the cooling system through the oil outlet channel 12.

[0060] It should be noted that in this embodiment, the outer casing 10 only needs to form one oil inlet channel 11 and one oil outlet channel 12. To facilitate a clear understanding of the communication relationship between the oil inlet channel 11, the oil outlet channel 12, and the first oil guide channel 201 and the second oil guide channel 202, therefore, in Figure 1 and Figure 2 The image shows an oil inlet channel 11 and an oil outlet channel 12. However, in actual stator assembly products, when the image is cut along the first oil guide channel 201 axially or along the second oil guide channel 202 axially, the oil inlet channel 11 and the oil outlet channel 12 may not necessarily be visible.

[0061] The stator core 21 has an axially extending first oil guide channel 201, a second oil guide channel 202, and a radially extending third oil guide channel 203. The first oil guide channel 201 is formed in the yoke portion of the stator core 21, the second oil guide channel 202 is formed in the tooth portion of the stator core 21, and the third oil guide channel 203 is located in the stator core 21 and extends from the yoke portion to the tooth portion. One end of the first oil guide channel 201 (i.e., the inlet 201b) is connected to the annular oil channel 101, and the other end forms an oil spray nozzle 201a for spraying coolant into the end winding 22. Coolant is transported from the annular oil channel 101 to the second oil guide channel 202 through the third oil guide channel 203, so that coolant can be sprayed into the end winding 22 from both axial ends of the second oil guide channel 202.

[0062] Combination Figure 2 and Figure 3It is known that the second oil guide channel 202 includes an oil storage cavity 202a located in the middle of the stator core and oil outlets 202b located at both ends in the axial direction. The second end of the third oil guide channel 203, which communicates with the second oil guide channel 202, is located on the radial outer side of the oil storage cavity 202a, which can ensure that the coolant accumulates in the oil storage cavity 202a. Moreover, the oil outlet 202b is located on the radial inner side of the oil storage cavity 202a. This arrangement can increase the pressure of the coolant sprayed out at the oil outlet 202b, ensuring the cooling efficiency of the end winding 22.

[0063] In the stator assembly provided in this embodiment, the end winding 22 at one end can be cooled by providing an oil guide ring 30, and the end winding 22 at the other end can be cooled not only by providing a first oil guide channel 201, but also by providing a second oil guide channel 202, which can cool not only the teeth of the stator core 21, but also the end windings 22 at both ends. This allows the yoke and teeth of the stator core 21 to be in direct contact with the coolant, and the end windings 22 at both ends to be sprayed with coolant in two directions, thereby improving the heat dissipation efficiency of the stator assembly.

[0064] Furthermore, the second oil channel 202 includes an oil storage chamber 202a located in the middle of the stator core, which allows the coolant to accumulate in the oil storage chamber 202a before being sprayed out from the oil outlet 202b. This increases the pressure of the coolant sprayed from the oil outlet 202b, allowing the coolant to cover more of the end windings 22 and improve the heat dissipation performance of the end windings 22, thereby further improving the heat dissipation efficiency of the stator assembly.

[0065] In this embodiment, when the stator core 21 is installed in place, the first oil guide channel 201 is only located in the upper half of the stator core 21. Specifically, the first oil guide channel 201 is formed in the yoke of the stator core 21, and multiple first oil guide channels 201 are arranged at intervals along the circumference. The second oil guide channel 202 is distributed at intervals along the circumference throughout the entire stator core 21, and in the upper half of the stator core 21, the first oil guide channel 201 and the second oil guide channel 202 are arranged alternately along the circumference.

[0066] The advantage of this design is that, while ensuring cooling efficiency, it reduces the number of openings in the laminations forming the stator core 21. This not only ensures the structural strength of the laminations and improves the yield of the stator core 21, but also helps reduce iron losses in the stator core 21, thus ensuring motor performance. The structure of each lamination will be described in detail later and will not be repeated here.

[0067] To make it easier to visually understand the flow direction of the coolant, Figures 1-3 The direction of coolant flow is indicated by a dashed line with an arrow.

[0068] Combination Figures 1-3 As can be seen, in this embodiment, the coolant output from the cooling system enters the annular oil passage 101 through the oil inlet passage 11. Since the oil inlet passage 11 is located at the top, the coolant will first flow to the bottom of the annular oil passage 101 until the coolant accumulates to fill the entire annular oil passage 101. During this process, some coolant will be sprayed onto the end winding 22 through the oil distribution hole 31 and drip from the end winding 22 to the bottom of the first chamber 102, achieving the first heat dissipation of the end winding 22 located at the first end of the stator core 21, and then flowing out of the first chamber 102 into the oil passage 12.

[0069] A portion of the coolant accumulated in the annular oil passage 101 flows into the first oil guide passage 201 and is eventually sprayed from the oil nozzle 201a onto the end winding 22, thereby achieving the first heat dissipation for the end winding 22 located at the second end of the stator core 21. As the coolant flows along the first oil guide passage 201, it carries away the heat accumulated in the yoke of the stator core 21.

[0070] Another portion of the coolant accumulated in the annular oil passage 101 flows into the second oil passage 202 through the third oil passage 203 until the oil reservoir 202a of the second oil passage 202 is filled. During this process, the coolant is sprayed from the oil outlets 202b at both ends of the second oil passage 202 onto the end windings 22, thereby achieving a second heat dissipation for the end windings 22 located at the first and second ends of the stator core 21. As the coolant flows along the second oil passage 202, it can carry away the heat accumulated on the teeth of the stator core 21.

[0071] The specific structures of the first oil guide channel 201, the second oil guide channel 202, and the third oil guide channel 203 in this embodiment will be described below in conjunction with the structures of the first stamping S1, the second stamping S2, and the third stamping S3.

[0072] In this embodiment, the stator core 21 includes a main body stack 211 formed by multiple stacked stator stacks, and the stator stack is formed by multiple third laminations S3 stacked axially. One end of the main body stack 211 is provided with a first lamination S1 and a second lamination S2, and the other end is provided with two second laminations S2.

[0073] Moreover, such as Figure 4 As shown, in this embodiment, each oil channel is formed inside the stator core 21, eliminating the need to use the outer peripheral wall of the stator core 21 to form an oil channel. This ensures the integrity of the outer peripheral wall of each lamination. Therefore, the weld bead H of the stator core 21 is equal to the length of the stator core 21, which reduces the welding difficulty of the stator core 21 while ensuring the structural strength of the stator core 21.

[0074] The first lamination S1 includes a plurality of first strip holes S11, a plurality of first oil guide holes S12 and a plurality of second oil guide holes S13, wherein the first strip holes S11 extend radially from the yoke of the lamination to the toothed portion, the first oil guide holes S12 are located in the yoke, and the second oil guide holes S13 are located in the toothed portion.

[0075] The second lamination S2 includes multiple first oil outlet holes S21 and multiple injection hole groups S22, wherein the first oil outlet holes S21 are located in the toothed part and the injection hole groups S22 are located in the yoke part.

[0076] The third lamination S3 includes multiple third oil guide holes S31 and multiple second strip holes S32, wherein the third oil guide holes S31 are located in the yoke and the second strip holes S32 are located in the toothed portion. The diameter of the first oil outlet hole S21 is smaller than the radial dimension of the second strip hole S32.

[0077] After the laminations are stacked to form the stator core 21, the injection hole group S22, the first oil guide hole S12 and the third oil guide hole S31 are connected axially to form the first oil guide channel 201 located in the yoke. The second oil guide hole S13, the second strip hole S32 and the first oil outlet hole S21 are connected axially to form the second oil guide channel 202 located in the tooth. The first strip hole S11 forms the third oil guide channel 203 extending radially.

[0078] Specifically, the second strip-shaped hole S32 in each third lamination S3, which is axially connected, forms the oil storage cavity 202a of the second oil guide channel 202. The second oil guide hole S13 of the first lamination S1 and the first oil outlet hole S21 of the second lamination S2 at one end of the stator core 21 are connected to form the oil outlet 202b at one end of the second oil guide channel 202. The first oil outlet holes S21 of the two second laminations S2 at the other end of the stator core 21 are connected to form the oil outlet 202b at the other end of the second oil guide channel 202. The radial dimension of the oil outlet 202b is smaller than the radial dimension of the oil storage cavity 202a to ensure the oil outlet pressure of the oil outlet 202b.

[0079] In this embodiment, the stator core 21 only requires three types of laminations to form three types of oil channels, which can greatly reduce the manufacturing cost of the stator core 21.

[0080] like Figure 12 As shown, in the first lamination S1, the first strip hole S11 and the second oil guide hole S13 are arranged in a radial pair, and the second oil guide hole S13 is located on the radial inner side of the first strip hole S1 to ensure that the second oil guide hole S13 is connected to the oil storage cavity 202a and is located on the radial inner side of the oil storage cavity 202a.

[0081] Moreover, the first strip hole S11 and the second oil guide hole S13, which are arranged in pairs, are spaced apart from the first oil guide hole S12 in the circumferential direction, so that half of the teeth in the first lamination S1 can remain intact. While ensuring the structural strength of the first lamination S1, the influence of the second oil guide hole S13 and the first strip hole S11 on the magnetic circuit can be reduced, thus ensuring the performance of the stator.

[0082] like Figure 13 As shown, the axis of symmetry of the first strip-shaped hole S11 and the axis of symmetry of the second oil guide hole S13 are collinear in the radial direction, and the axis of symmetry of the first strip-shaped hole S11 is collinear with the axis of symmetry O1 of the tooth. The extension lines O2 and O3 of the two sides of the first strip-shaped hole S11 are parallel to the sidewall of the tooth. Therefore, the influence of the second oil guide hole S13 and the first strip-shaped hole S11 on the magnetic circuit can be further reduced, ensuring the performance of the stator.

[0083] like Figure 14 As shown, in the second lamination S2, when the stator core 21 is installed in place, the yoke portion of the upper half of the second lamination S2 has a group of injection holes S22 arranged circumferentially at intervals. The injection hole group S22 includes a plurality of injection holes arranged circumferentially at intervals.

[0084] In this embodiment, each injection hole group S22 includes a first injection hole S221 and a second injection hole S222. The distance between the first injection hole S221 and the central axis of the second lamination S2 is greater than the distance between the second injection hole S222 and the central axis of the second lamination S2. The circumferential distance between the first injection hole S221 and the second injection hole S222 is one slot. This allows the two second laminations S2 located at the second end of the stator core 21 (i.e., the end without the oil guide ring) to be circumferentially misaligned by one slot. After the first injection hole S221 of one second lamination S2 and the second injection hole S222 of the other second lamination S2 are axially connected, the extension direction of the injection port 201a formed by them can intersect with the end winding 22, ensuring that the coolant sprayed from the injection port 201a can effectively cover the end winding 22 and ensure cooling efficiency.

[0085] For the second lamination S2 located at the first end of the stator core 21 (i.e., the end where the oil guide ring is provided), the first oil injection hole S221 is connected to the third oil guide hole S31 of the third lamination S3, that is, the first oil injection hole S221 constitutes the oil inlet of the first oil guide channel 201. The second oil injection hole S222 serves as a drainage hole connected to the first strip hole S11 of the first lamination S1, so as to guide the coolant into the third oil guide channel 203.

[0086] like Figure 15As shown, in the third lamination S1, the third oil guide hole S31 and the second strip hole S32 are arranged circumferentially, so that half of the teeth in the third lamination S1 can remain intact. While ensuring the structural strength of the third lamination S1, the influence of the second strip hole S32 on the magnetic circuit can be reduced, thus ensuring the performance of the stator.

[0087] like Figure 16 As shown, the axis of symmetry of the second strip hole S32 is collinear with the axis of symmetry O1 of the tooth. The extension lines O2 and O3 of the two sides of the second strip hole S32 are parallel to the sidewall of the tooth. Therefore, the influence of the second strip hole S32 on the magnetic circuit can be further reduced, ensuring the performance of the stator.

[0088] Based on the same inventive concept, this embodiment also provides a flat wire motor, which includes the stator assembly described above. The beneficial effects of this flat wire motor are as described above regarding the stator assembly, and will not be repeated here.

[0089] Based on the above stator assembly structural design, the flat wire motor provided in this embodiment can be an aluminum winding motor, that is, the motor winding is formed by winding aluminum flat wire, thereby reducing the manufacturing cost of the flat wire motor.

[0090] It should be understood that the above-described embodiments and some aspects or features thereof can be appropriately combined.

[0091] This application has at least one of the following advantages:

[0092] (i) In the stator assembly provided in this embodiment, by providing the cooperation of the oil guide ring, the first oil guide channel, and the second oil guide channel, the yoke and teeth of the stator core can be directly contacted with the coolant, and the end windings at both ends can also be sprayed by the two coolants, thereby improving the heat dissipation efficiency of the stator assembly. Moreover, by providing an oil storage cavity in the middle of the second oil guide channel, the pressure of the coolant sprayed from the oil outlet can be increased, so that the spray range of the coolant covers more end windings, improving the heat dissipation performance of the end windings, thereby further improving the heat dissipation efficiency of the stator assembly.

[0093] (ii) The stator core only requires three sizes of laminations, which can greatly reduce the manufacturing cost of the stator core. Moreover, each oil channel is formed inside the stator core, which makes it easy to form a weld bead of the same length as its axis on the outer peripheral wall of the stator core, which can ensure the structural strength of the stator core and reduce the welding difficulty of the stator core.

[0094] (iii) The extension direction of the first oil guide channel injection port intersects with the end winding to ensure that the coolant sprayed from the injection port can effectively cover the end winding and ensure cooling efficiency.

[0095] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application.

Claims

1. A stator assembly, comprising: The housing and a stator disposed within the housing, the stator including a stator core and end windings disposed at both ends of the stator core, characterized in that an oil guide ring is fitted at one axial end of the stator core, the oil guide ring surrounds the outer periphery of the end windings, and an oil distribution hole is formed on the oil guide ring, the outer peripheral wall of the oil guide ring and the housing and the stator core enclose to form an annular oil channel, and the inner peripheral wall of the oil guide ring and the housing enclose to form a first chamber; The outer casing has an axially extending oil inlet channel and an oil outlet channel on its peripheral wall. The oil inlet channel is connected to the annular oil channel, and both the annular oil channel and the oil outlet channel are connected to the first chamber. The stator core includes a plurality of first oil guide channels formed in the yoke and extending axially, a plurality of second oil guide channels formed in the toothed portion and extending axially, and a plurality of third oil guide channels formed at the ends of the stator core and extending radially. The first oil guide channels are connected to the annular oil channels, and the first end of the third oil guide channel is connected to the annular oil channel, and the second end is connected to the second oil guide channel. The second oil guide channel includes an oil storage cavity located in the middle of the stator core and oil outlets located at both ends axially. The oil outlets are located radially inside the oil storage cavity, and the second end of the third oil guide channel is located radially outside the oil storage cavity. The stator core includes a main body stack, a first lamination, and a second lamination. Along the direction from the middle of the stator core to the end, at least one first lamination and at least one second lamination are sequentially provided at the first end of the main body stack, and at least two second laminations are provided at the second end of the main body stack; and among all the second laminations located at the second end, any two adjacent second laminations are misaligned circumferentially. Both the first and second oil guide channels axially penetrate the main body stack, the first lamination, and the second lamination; the first lamination has a plurality of first strip holes extending from the yoke to the toothed portion, and the first strip holes, the main body stack, and the second lamination adjacent to the first lamination enclose the third oil guide channel; the yoke of the second lamination adjacent to the first lamination has a drainage hole communicating with the first strip holes.

2. The stator assembly according to claim 1, characterized in that, When the stator core is installed in place, the first oil guide channel is located only in the upper half of the stator core, and the second oil guide channel is distributed circumferentially throughout the entire stator core. In the upper half of the stator core, the first oil guide channel and the second oil guide channel are arranged alternately along the circumference.

3. The stator assembly according to claim 1, characterized in that, The first lamination also includes a plurality of first oil guide holes formed on the yoke and a plurality of second oil guide holes formed on the teeth. The first oil guide holes are used to form the first oil guide channel, and the second oil guide holes are used to form an oil outlet at one end of the second oil guide channel. The first strip hole and the second oil guide hole are arranged in a radial pair, and the second oil guide hole is located radially inside the first strip hole.

4. The stator assembly according to claim 3, characterized in that, The main body stack includes a plurality of third laminations stacked along the axial direction. The yoke of the third lamination is formed with a plurality of third oil guide holes arranged at intervals along the circumference. At least two teeth of the third lamination are formed with second strip holes. The third oil guide holes are used to form the first oil guide channel, and the second strip holes are used to form the oil storage cavity. In the third lamination, at least one tooth without the second strip hole is provided between any two circumferentially adjacent teeth that have the second strip hole, and the third oil guide hole is formed on the yoke adjacent to the tooth without the second strip hole in the radial direction.

5. The stator assembly according to claim 4, characterized in that, Along the axial direction, the radial inner end of the first strip hole is connected to the radial outer end of the second strip hole, and the second oil guide hole is connected to the radial inner end of the second strip hole formed by the teeth of the third punch.

6. The stator assembly according to claim 4, characterized in that, The first strip-shaped hole includes two opposing sides along the circumferential direction, both sides being parallel to the sidewall of the toothed portion forming the first strip-shaped hole; and / or, The second strip-shaped hole includes two opposing sides along the circumferential direction, both sides being parallel to the sidewall of the toothed portion on which the second strip-shaped hole is formed.

7. The stator assembly according to claim 1, characterized in that, The teeth of the second lamination are formed with a first oil outlet hole, which is used to form the oil outlet. When the stator core is installed in place, the yoke of the upper half of the second lamination has a plurality of injection hole groups arranged circumferentially, and at least one injection hole in the injection hole group forms the oil injection port of the first oil guide channel.

8. The stator assembly according to claim 7, characterized in that, The injection hole group includes a first injection hole and a second injection hole, wherein the distance between the first injection hole and the central axis of the second punch is greater than the distance between the second injection hole and the central axis of the second punch; In the second lamination located at the first end of the main body stack, the first oil injection hole forms the oil inlet of the first oil guide channel, and the second oil injection hole forms the drain hole; The second end of the main body stack is provided with two second punches, and the first oil injection hole of one second punch is axially connected to the second oil injection hole of the other second punch, and the second oil injection hole is located axially outside the first oil injection hole.

9. A flat wire motor, characterized in that, It includes at least one stator assembly as described in any one of claims 1-8.

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