Stator core, stator assembly, motor, driving assembly and vehicle

Abstract

The utility model relates to a stator iron core, a stator assembly, a motor, a driving assembly and a vehicle, the stator iron core comprises an iron core body, a linear flow channel part and a snake-shaped flow channel part are formed on the iron core body, the linear flow channel part is provided with a first liquid inlet in a first end of the iron core body, the linear flow channel part is provided with a first liquid outlet in a second end of the iron core body, and the snake-shaped flow channel part is provided with a second liquid outlet in a second end of the iron core body. The S-shaped flow channel part is provided with a second liquid inlet in the first end of the iron core body, the S-shaped flow channel part is provided with a second liquid outlet in the second end of the iron core body, the linear flow channel part and the S-shaped flow channel part are mutually independent, and the linear flow channel part extends in the axial direction of the iron core body and penetrates through the iron core body. According to the stator iron core, the cooling time difference between the stator winding at the first end of the iron core body and the stator winding at the second end of the iron core body can be shortened, and the cooling effect on the stator windings at the two ends of the iron core body is guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motor cooling, and in particular, to a stator core, a stator assembly, a motor, a drive assembly and a vehicle. Background Art

[0002] Since the higher the motor speed, torque density and power density, the higher the heat it generates, the heat dissipation and cooling structure of the motor are essential for the reliable, stable and efficient operation of the motor. The cooling methods of the motor can be divided into air cooling, water cooling and oil cooling. Oil cooling is becoming the first choice for high-performance motor cooling solutions due to its natural electrical insulation and high structural design freedom.

[0003] In the related art, a cooling flow path for cooling oil to pass through is provided inside the stator core, and oil rings are usually provided at both ends of the stator core. When cooling oil is injected into the motor for cooling, a part of the cooling oil can cool the stator winding inside the oil ring at one end of the stator core, and the other part of the cooling oil passes through the cooling flow path on the stator core to cool the stator core, and then enters the oil ring at the other end of the stator core to cool the stator winding inside the oil ring at the other end of the stator core. The flow path of the cooling oil in the cooling flow path is relatively long, resulting in a longer time for the cooling oil to flow from one end of the stator core to the other end of the stator core, which in turn results in a large difference in the cooling time of the stator winding inside the two oil rings. Utility Model Content

[0004] The purpose of the present disclosure is to provide a stator core, a stator assembly, a motor, a drive assembly and a vehicle to solve the technical problems existing in the related art.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides a stator core, including a core body, on which a straight flow channel portion and a serpentine flow channel portion are formed, the straight flow channel portion having a first liquid inlet on the first end of the core body, the straight flow channel portion having a first liquid outlet on the second end of the core body, the serpentine flow channel portion having a second liquid inlet on the first end of the core body, the serpentine flow channel portion having a second liquid outlet on the second end of the core body, the straight flow channel portion and the serpentine flow channel portion being independent of each other, and the straight flow channel portion extending along the axial direction of the core body and penetrating the core body.

[0006] Optionally, there are multiple straight flow channel portions and multiple serpentine flow channel portions, and the multiple straight flow channel portions and the multiple serpentine flow channel portions are arranged at intervals along the circumference of the core body, and the straight flow channel portions and the serpentine flow channel portions are alternately arranged along the circumference of the core body.

[0007] Optionally, the plurality of straight flow channel portions include a first straight flow channel portion and a second straight flow channel portion, and the first straight flow channel portion and the second straight flow channel portion are opposite to each other along the radial direction of the core body;

[0008] The multiple serpentine flow channel portions include a first serpentine flow channel portion and a second serpentine flow channel portion, the first serpentine flow channel portion is located between one side of the first straight flow channel portion and one side of the second straight flow channel portion, and the second serpentine flow channel portion is located between the other side of the first straight flow channel portion and the other side of the second straight flow channel portion.

[0009] Optionally, the second liquid inlet of the first serpentine flow channel portion and the second liquid inlet of the second serpentine flow channel portion are both adjacent to the first liquid inlet of the first straight flow channel portion; and / or,

[0010] The second liquid outlet of the first serpentine flow channel portion and the second liquid outlet of the second serpentine flow channel portion are both adjacent to the first liquid outlet of the first straight flow channel portion.

[0011] Optionally, an area of ​​the second liquid inlet of the first serpentine flow channel portion and an area of ​​the second liquid inlet of the second serpentine flow channel portion are both larger than an area of ​​the first liquid inlet of the first straight flow channel portion.

[0012] Optionally, the linear flow channel portion includes a plurality of linear flow channels, the plurality of linear flow channels are arranged side by side along the circumference of the core body, and each of the linear flow channels extends along the axial direction of the core body and penetrates the core body.

[0013] Optionally, the serpentine flow channel portion includes a plurality of arcuate flow channels, each of the arcuate flow channels extends along the circumference of the core body, and the plurality of arcuate flow channels are arranged along the axial direction of the core body and connected end to end.

[0014] Optionally, the core body comprises a plurality of first core segments and a plurality of second core segments, the first core segments and the second core segments are alternately arranged along the axial direction of the core body, and the first core segments and the second core segments are stacked along the axial direction of the core body;

[0015] The linear flow channel portion includes at least one linear flow channel, each of the first core segments is formed with a first linear sub-flow channel extending along the axial direction of the first core segment and penetrating the first core segment, each of the second core segments is formed with a second linear sub-flow channel extending along the axial direction of the second core segment and penetrating the second core segment, and the first linear sub-flow channel and the second linear sub-flow channel are connected to each other to form the linear flow channel;

[0016] A connecting flow channel penetrating the first core segment is formed on each of the first core segments, and an arcuate flow channel extending along the circumference of the second core segment is formed on each of the second core segments. One end of the arcuate flow channel on each of the second core segments is connected to a connecting flow channel on a first core segment adjacent to the second core segment, and the other end of the arcuate flow channel on each of the second core segments is connected to a connecting flow channel on another first core segment adjacent to the second core segment. The connecting flow channel and the arcuate flow channel together constitute the serpentine flow channel portion.

[0017] Optionally, the connecting flow channel on one of the two first core segments adjacent to the second core segment is centrally symmetrical with the connecting flow channel on the other first core segment about the central axis of the core body.

[0018] Optionally, each of the first core segments includes a plurality of first stator punching sheets, each of the second core segments includes a plurality of second stator punching sheets, the plurality of first stator punching sheets are stacked along the axial direction of the first core segment, and the plurality of second stator punching sheets are stacked along the axial direction of the second core segment;

[0019] A first through hole is formed on each of the first stator punching sheets, and the first through holes on the plurality of first stator punching sheets of each of the first core segments are coaxial and interconnected to form the first straight sub-flow channel; a second through hole is formed on each of the second stator punching sheets, and the second through holes on the plurality of second stator punching sheets of each of the second core segments are coaxial and interconnected to form the second straight sub-flow channel;

[0020] A third through hole is formed on each of the first stator punching sheets, and the third through holes on the multiple first stator punching sheets of each of the first core segments are coaxial and interconnected to form the connecting flow channel. An arcuate groove extending along the circumferential direction of the second stator punching sheet is formed on each of the second stator punching sheets, and the arcuate grooves on the multiple second stator punching sheets of each of the second core segments are aligned with each other and connected to form the arcuate flow channel.

[0021] According to a second aspect of the present disclosure, a stator assembly is provided, including a stator, wherein the stator includes the above-mentioned stator core.

[0022] Optionally, the stator assembly further includes a first cooling ring and a second cooling ring, the first cooling ring and the second cooling ring are respectively located at two ends of the stator core along the axial direction of the stator core, the outer circumferential surface of the first cooling ring can be used to define a first liquid storage cavity between the first cooling ring and the inner wall of the motor casing, the outer circumferential surface of the second cooling ring can be used to define a second liquid storage cavity between the second cooling ring and the inner wall of the motor casing, the first liquid inlet and the second liquid inlet are both connected to the first liquid storage cavity, and the first liquid outlet and the second liquid outlet are both connected to the second liquid storage cavity.

[0023] Optionally, the stator also includes a stator winding wound on the stator core, the stator winding having a first protrusion protruding from the first end of the stator core and a second protrusion protruding from the second end of the stator core, the first protrusion is located on the inner side of the first cooling ring, the second protrusion is located on the inner side of the second cooling ring, a first liquid spray port is provided on the first cooling ring, a second liquid spray port is provided on the second cooling ring, the first liquid spray port is connected to the first liquid storage chamber and is used to spray liquid onto the first protrusion, and the second liquid spray port is connected to the second liquid storage chamber and is used to spray liquid onto the second protrusion.

[0024] Optionally, the first cooling ring has a gradually expanding section, and the diameter of the gradually expanding section gradually increases along the direction from one end of the gradually expanding section close to the stator core to one end away from the stator core, and the first liquid injection port is formed on the gradually expanding section.

[0025] According to a third aspect of the present disclosure, a motor is provided, comprising a housing and the above-mentioned stator assembly, wherein the stator assembly is located in the housing, a liquid injection hole is formed on the housing, and the first liquid inlet and the second liquid inlet are both connected to the liquid injection hole.

[0026] According to a fourth aspect of the present disclosure, there is provided a drive assembly comprising the above-mentioned motor.

[0027] According to a fifth aspect of the present disclosure, a vehicle is provided, comprising the above-mentioned drive assembly.

[0028] Through the above technical solution, in the process of injecting cooling medium into the motor to cool the motor, a part of the cooling medium can cool the stator winding located at the first end of the core body, and the other part of the cooling medium can flow into the straight flow channel part and the serpentine flow channel part through the first liquid inlet and the second liquid inlet respectively. The cooling medium flowing in the serpentine flow channel part has a tortuous flow path, and the flow path of the cooling medium in the serpentine flow channel part is longer, which can have a good cooling effect on the core body; the cooling medium in the straight flow channel part can flow in a straight line along the axial direction of the core body, cooling the core body while quickly flowing to the second end of the core body and flowing out through the first liquid outlet, so as to quickly cool the stator winding located at the second end of the core body.

[0029] Since the flow path of the cooling medium in the straight flow channel is shorter than the flow path of the cooling medium in the serpentine flow channel, the flow time of the cooling medium in the straight flow channel is shorter than the flow time of the cooling medium in the serpentine flow channel. The cooling medium can quickly flow from the first end of the core body to the second end of the core body through the straight flow channel and cool the stator winding at the second end of the core body, thereby shortening the cooling time difference between the stator winding at the first end of the core body and the stator winding at the second end of the core body, and ensuring the cooling effect of the stator winding at both ends of the core body. In addition, since the straight flow channel and the serpentine flow channel are independent of each other, the flow time, flow rate, etc. of the cooling medium in the straight flow channel will not be affected by the serpentine flow channel.

[0030] In other words, in the stator core provided by the present invention, the serpentine flow channel portion enables the cooling medium flowing through the core body to have a curved flow path, thereby ensuring the cooling effect on the core body, while the straight flow channel portion enables the cooling medium flowing through the core body to have a straight flow path, thereby enabling the cooling medium to flow quickly from the first end of the core body to the second end of the core body, thereby ensuring the cooling effect on the stator windings at both ends of the core body.

[0031] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 is a schematic diagram of a three-dimensional structure of a stator assembly provided in an exemplary embodiment of the present disclosure;

[0034] Figure 2 yes Figure 1 A magnified view of part A;

[0035] Figure 3 is a schematic diagram of a three-dimensional structure of a stator core provided in an exemplary embodiment of the present disclosure;

[0036] Figure 4 is a three-dimensional schematic diagram of an internal flow channel of a stator core provided in an exemplary embodiment of the present disclosure, wherein arrows are used to indicate a flow path of a cooling medium;

[0037] Figure 5 is an expanded schematic diagram of a stator core provided in an exemplary embodiment of the present disclosure, wherein arrows are used to illustrate a flow path of a cooling medium;

[0038] Figure 6 is a structural schematic diagram of a first stator punching sheet located on a first end of a core body of a stator core provided in an exemplary embodiment of the present disclosure;

[0039] Figure 7 is a schematic structural diagram of a second stator punching sheet of a stator core provided in an exemplary embodiment of the present disclosure;

[0040] Figure 8 is a schematic structural diagram of a first stator punching sheet located between a first end and a second end of a core body of a stator core provided in an exemplary embodiment of the present disclosure;

[0041] Fig. 9 is a cross-sectional view of a motor provided in an exemplary embodiment of the present disclosure, wherein arrows are used to illustrate a flow path of a cooling medium;

[0042] Fig.10 yes Fig. 9 An enlarged view of part B in FIG. 1 , arrows are used to show the flow path of the cooling medium;

[0043] Fig.11 yes Fig. 9 An enlarged view of part C in FIG. 1 , arrows are used to show the flow path of the cooling medium.

[0044] Description of Reference Numerals

[0045] 1. Core body; 101. First core segment; 1011. First stator sheet; 102. Second core segment; 1021. Second stator sheet; 2. Straight channel; 201. First straight channel; 202. Second straight channel; 3. Serpentine channel; 301. First serpentine channel; 302. Second serpentine channel; 4. First liquid inlet; 5. First liquid outlet; 6. Second liquid inlet; 7. Second liquid outlet; 8. Connecting flow channel; 9, arc-shaped flow channel; 10, first through hole; 11, second through hole; 12, third through hole; 13, arc-shaped groove; 14, first cooling ring; 15, second cooling ring; 16, first liquid storage chamber; 17, second liquid storage chamber; 18, first protrusion; 19, second protrusion; 20, first liquid spray port; 21, second liquid spray port; 22, gradually expanding section; 23, shell; 24, liquid injection hole; 25, liquid discharge hole; 26, first end; 27, second end. DETAILED DESCRIPTION

[0046] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0047] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", are generally defined in terms of the normal use state of the motor, and "inner" and "outer" refer to the inner and outer sides of the corresponding component outlines. The terms "first", "second", etc. are used to distinguish different components and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0048] like Figures 1 to 11 As shown, the present disclosure provides a stator core, including a core body 1, on which a straight flow channel portion 2 and a serpentine flow channel portion 3 are formed, the straight flow channel portion 2 has a first liquid inlet 4 on the first end 26 of the core body 1, the straight flow channel portion 2 has a first liquid outlet 5 on the second end 27 of the core body 1, the serpentine flow channel portion 3 has a second liquid inlet 6 on the first end 26 of the core body 1, the serpentine flow channel portion 3 has a second liquid outlet 7 on the second end 27 of the core body 1, the straight flow channel portion 2 and the serpentine flow channel portion 3 are independent of each other, and the straight flow channel portion 2 extends along the axial direction of the core body 1 and penetrates the core body 1.

[0049] It can be understood that the straight flow channel portion 2 extends along the axial direction of the core body 1 and passes through the core body 1, which means that the straight flow channel portion 2 extends from one axial end of the core body 1 to the other end and passes through the core body. That is to say, the straight flow channel portion 2 can extend along a direction parallel to the central axis of the core body 1 and pass through the core body 1, or it can extend and pass through the core body 1 at a certain angle relative to the central axis of the core body 1, as long as the straight flow channel portion 2 extends straightly between the two ends of the core body 1 in the axial direction and passes through the core body 1.

[0050] Through the above technical solution, in the process of injecting cooling medium into the motor to cool the motor, a part of the cooling medium can cool the stator winding located at the first end 26 of the core body 1, and the other part of the cooling medium can flow into the straight flow channel portion 2 and the serpentine flow channel portion 3 through the first liquid inlet 4 and the second liquid inlet 6 respectively. The cooling medium flowing in the serpentine flow channel portion 3 has a tortuous flow path, and the flow path of the cooling medium in the serpentine flow channel portion 3 is relatively long, which can have a good cooling effect on the core body 1; the cooling medium in the straight flow channel portion 2 can flow in a straight line along the axial direction of the core body 1, cool the core body 1, and quickly flow to the second end 27 of the core body 1 and flow out through the first liquid outlet 7, so as to quickly cool the stator winding located at the second end 27 of the core body 1.

[0051] Since the flow path of the cooling medium in the straight flow channel portion 2 is shorter than the flow path of the cooling medium in the serpentine flow channel portion 3, the flow time of the cooling medium in the straight flow channel portion 2 is shorter than the flow time of the cooling medium in the serpentine flow channel portion 3. The cooling medium can quickly flow from the first end 26 of the core body 1 to the second end 27 of the core body 1 through the straight flow channel portion 2 and cool the stator winding at the second end of the core body 1, thereby shortening the cooling time difference between the stator winding at the first end 26 of the core body 1 and the stator winding at the second end 27 of the core body 1, and ensuring the cooling effect on the stator winding at both ends of the core body 1. In addition, since the straight flow channel portion 2 and the serpentine flow channel portion 3 are independent of each other, the flow time and flow rate of the cooling medium in the straight flow channel portion 2 will not be affected by the serpentine flow channel portion 3.

[0052] In other words, in the stator core provided in the present invention, the serpentine flow channel portion 3 enables the cooling medium flowing through the core body 1 to have a curved flow path, thereby ensuring the cooling effect on the core body 1, while the straight flow channel portion 2 enables the cooling medium flowing through the core body 1 to have a straight flow path, so that the cooling medium can flow quickly from the first end 26 of the core body 1 to the second end 27 of the core body 1, thereby ensuring the cooling effect on the stator windings at both ends of the core body 1.

[0053] It should be noted that the cooling medium can be oil or other types of coolants, as long as it has electrical insulation and can cool the stator core and stator windings, and the present disclosure does not limit this.

[0054] In order to further improve the cooling effect on the core body 1 and increase the flow rate of the cooling medium flowing to the second end 27 of the core body 1, optionally, there can be multiple straight flow channel parts 2, and there can also be multiple serpentine flow channel parts 3, and the multiple straight flow channel parts 2 and the multiple serpentine flow channel parts 3 are arranged at intervals along the circumference of the core body 1, and the straight flow channel parts 2 and the serpentine flow channel parts 3 are arranged alternately along the circumference of the core body 1, that is, there is a serpentine flow channel part 3 between two adjacent straight flow channel parts 2, and there is a straight flow channel part 2 between two adjacent serpentine flow channel parts 3. Such an arrangement allows the straight flow channel parts 2 and the serpentine flow channel parts 3 to surround the core body 1 together along the circumference of the core body 1, so that the cooling medium can cover the entire circumferential direction of the core body 1 in the process of flowing through the multiple straight flow channel parts 2 and the multiple serpentine flow channel parts 3, so as to improve the cooling effect on the core body 1. Moreover, the provision of a plurality of straight flow channel portions 2 can, on the one hand, increase the flow rate of the cooling medium that flows rapidly to the second end 27 of the core body 1, thereby improving the cooling effect on the stator winding at the second end 27 of the core body 1; on the other hand, it can also enable the cooling medium to flow out rapidly from different positions of the second end 27 of the core body 1, thereby cooling different positions of the stator winding at the second end 27 of the core body 1.

[0055] As an exemplary embodiment, the plurality of linear flow channel portions 2 include a first linear flow channel portion 201 and a second linear flow channel portion 202, and the first linear flow channel portion 201 and the second linear flow channel portion 202 are opposite to each other along the radial direction of the core body 1. When the stator core is installed in the motor, since the cooling medium is usually injected into the motor from the top of the motor, and the first linear flow channel portion 201 and the second linear flow channel portion 202 are opposite to each other along the radial direction of the core body 1, Figure 4 As shown, the first linear flow channel portion 201 and the second linear flow channel portion 202 can be arranged to be opposite to each other in the vertical direction, for example, the first linear flow channel portion 201 is located above the second linear flow channel portion 202 and close to the position where the motor injects the cooling medium. That is to say, the first liquid inlet 4 and the first liquid outlet 5 of the first linear flow channel portion 201 are both located above the first liquid inlet 4 and the first liquid outlet 5 of the second linear flow channel portion 202, so that a part of the cooling medium injected from the top of the motor can first enter the first liquid inlet 4 of the first linear flow channel portion 201, so that the cooling medium can flow into the second end 27 of the core body 1 along the first linear flow channel portion 201, and another part of the cooling medium injected from the top of the motor can flow from the bottom under the action of gravity and quickly enter the second linear flow channel portion 202 through the first liquid inlet 4 of the second linear flow channel portion 202 and flow to the second end 27 of the core body 1.

[0056] Combination Figure 4 and Figure 5 The plurality of serpentine flow passage portions 3 may include a first serpentine flow passage portion 301 and a second serpentine flow passage portion 302, wherein the first serpentine flow passage portion 301 is located between one side of the first straight flow passage portion 201 and one side of the second straight flow passage portion 202, and the second serpentine flow passage portion 302 is located between the other side of the first straight flow passage portion 201 and the other side of the second straight flow passage portion 202. The first serpentine flow passage portion 301 and the second serpentine flow passage portion 302 can cover the region of the core body 1 between the first straight flow passage portion 201 and the second straight flow passage portion 202, so that the cooling medium can cover as much of the core body 1 as possible during the flow process, thereby improving the cooling effect on the core body 1.

[0057] Alternatively, if Figure 4 As shown, the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302 are both adjacent to the first liquid inlet 4 of the first straight flow channel portion 201, so that in the process of injecting cooling medium into the motor, the time difference between the cooling medium entering the first straight flow channel portion 201 and the second serpentine flow channel portion 302 can be shortened, so that the cooling medium can almost simultaneously enter the first liquid inlet 4 of the first straight flow channel portion 201, the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302, that is, the first serpentine flow channel portion 301, the second serpentine flow channel portion 302 and the first straight flow channel portion 201 can be almost synchronously introduced with the cooling medium to achieve synchronous cooling of different circumferential regions of the core body 1.

[0058] Furthermore, based on the above-mentioned first straight flow channel portion 201 and second straight flow channel portion 202 being arranged in a relative positional relationship along the up-down direction, the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302 are both located at a higher position on the core body 1, so that the cooling medium can flow rapidly from top to bottom under the action of gravity after entering the first serpentine flow channel portion 301 and the second serpentine flow channel portion 302 through the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302, so as to realize rapid oil inlet into the first serpentine flow channel portion 301 and the second serpentine flow channel portion 302.

[0059] In order to increase the flow rate of the cooling medium into the upper part of the cooling ring at the second end 27 of the core body 1, optionally, as Figure 4As shown, the second liquid outlet 7 of the first serpentine flow channel portion 301 and the second liquid outlet 7 of the second serpentine flow channel portion 302 are both adjacent to the first liquid outlet 5 of the first straight flow channel portion 201, so that the cooling medium flowing out of the second liquid outlet 7 of the first serpentine flow channel portion 301 and the second liquid outlet 7 of the second serpentine flow channel portion 302 can flow into the top of the cooling ring at the second end 27 of the core body 1.

[0060] It can be understood that in the present disclosure, while the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302 are both arranged adjacent to the first liquid inlet 4 of the first straight flow channel portion 201, the second liquid outlet 7 of the first serpentine flow channel portion 301 and the second liquid outlet 7 of the second serpentine flow channel portion 302 can also be arranged adjacent to the first liquid outlet 5 of the first straight flow channel portion 201.

[0061] When the second liquid inlet 6 of the first serpentine flow channel portion 301 and the second liquid inlet 6 of the second serpentine flow channel portion 302 are both adjacent to the first liquid inlet 4 of the first straight flow channel portion 201, in order to compensate for the difference in the flow rate of the cooling medium entering due to the position setting relationship of the second liquid inlet 6 of the serpentine flow channel portion 3 and the first liquid inlet 4 of the straight flow channel portion 2 on the core body 1, optionally, the area of ​​the second liquid inlet 6 of the first serpentine flow channel portion 301 and the area of ​​the second liquid inlet 6 of the second serpentine flow channel portion 302 are both larger than the area of ​​the first liquid inlet 4 of the first straight flow channel portion 201, so that as much cooling medium as possible can flow into the serpentine flow channel portion 3 from the second liquid inlet 6, thereby increasing the flow rate in the serpentine flow channel portion 3 and enhancing the cooling effect on the circumferential surface of the core body 1.

[0062] Optionally, the linear flow channel portion 2 may include a plurality of linear flow channels, the plurality of linear flow channels are arranged side by side along the circumference of the core body 1, each linear flow channel extends along the axial direction of the core body 1 and penetrates the core body 1, and the plurality of linear flow channels can simultaneously pass cooling medium to the second end 27 of the core body 1, increase the flow rate of cooling medium to the second end 27 of the core body 1, and quickly cool the stator winding at the second end 27 of the core body 1. The specific number of linear flow channels can be flexibly set according to the flow rate of cooling medium that needs to be quickly passed into the second end 27 of the core body 1, and is not limited in the present disclosure.

[0063] It can be understood that, for the embodiment in which the straight flow channel portion 2 includes the first straight flow channel portion 201 and the second straight flow channel portion 202, the first straight flow channel portion 201 and / or the second straight flow channel portion 202 may include the above-mentioned multiple straight flow channels.

[0064] Optionally, the serpentine flow channel portion 3 may include a plurality of arc flow channels 9, each arc flow channel 9 extending along the circumference of the core body 1, and the plurality of arc flow channels 9 are arranged along the axial direction of the core body 1 and connected end to end, so that the cooling medium can cover different circumferential areas on the core body 1 during the flow in the arc flow channels 9, thereby improving the cooling effect on the core body 1. Of course, the number of arc flow channels 9 can be flexibly set according to the area that the cooling medium needs to cover on the core body 1 and the effect of the opening of the arc flow channels 9 on the structural strength of the core body 1, and is not limited in the present disclosure.

[0065] It can be understood that the specific bending method of the serpentine flow channel portion 3 is not limited to the above-mentioned embodiment provided in the present disclosure. For example, as another embodiment, each arc flow channel 9 can extend along the axial direction of the core body 1, and multiple arc flow channels 9 are arranged along the circumference of the core body 1 and connected end to end.

[0066] In the present disclosure, the structural form of the core body 1 can also be diverse. For example, in an exemplary embodiment provided in the present disclosure, the core body 1 can include a plurality of first core segments 101 and a plurality of second core segments 102. The first core segments 101 and the second core segments 102 are alternately arranged along the axial direction of the core body 1, and the first core segments 101 and the second core segments 102 are stacked along the axial direction of the core body 1. The linear flow channel portion 2 includes at least one linear flow channel. A first linear sub-flow channel extending along the axial direction of the first core segment 101 and penetrating the first core segment 101 is formed on each first core segment 101. A second linear sub-flow channel extending along the axial direction of the second core segment 102 and penetrating the second core segment 102 is formed on each second core segment 102. The first linear sub-flow channel and the second linear sub-flow channel are interconnected to form a linear flow channel. A connecting flow channel 8 penetrating the first core segment 101 is formed on each first core segment 101, and an arcuate flow channel 9 extending circumferentially along the second core segment 102 is formed on each second core segment 102. One end of the arcuate flow channel 9 on each second core segment 102 is connected to the connecting flow channel 8 on a first core segment 101 adjacent to the second core segment 102, and the other end of the arcuate flow channel 9 on each second core segment 102 is connected to the connecting flow channel 8 on another first core segment 101 adjacent to the second core segment 102. The connecting flow channel 8 and the arcuate flow channel 9 together constitute a serpentine flow channel portion 3.

[0067] As can be seen from the above, the core body 1 can be composed of multiple core segments, the first core segment 101 and the second core segment 102 can be aligned and fitted together along the axial direction of the core body 1, and the diameter of the first core segment 101 can be equal to the diameter of the second core segment 102, thereby reducing the difficulty of manufacturing the core body 1 as a whole. In addition, the axial length of the core body 1 can also be flexibly set according to the number of the first core segment 101 and the second core segment 102.

[0068] As an exemplary implementation, Figure 4 As shown, the core body 1 is illustrated as being composed of five core segments. Along the direction from the first end 26 to the second end 27 of the core body 1, the core body 1 includes a first core segment 101, a second core segment 102, a first core segment 101, a second core segment 102 and a first core segment 101 which are arranged in sequence. That is, the first end 26 and the second end 27 of the core body 1 are both composed of the first core segment 101, and the two first core segments 101 adjacent to the second core segment 102 are staggered 180° along the axis of the core body 1.

[0069] In addition, in order to make the arc-shaped flow channel 9 cover as much of the circumferential surface of the core body 1 as possible, the connecting flow channel 8 on one of the two first core segments 101 adjacent to the second core segment 102 is symmetrical with the connecting flow channel 8 on the other first core segment 101 about the central axis of the core body 1. In other words, the two connecting flow channels 8 are 180° apart on the circumferential surface of the core body 1. Along the flow direction of the cooling medium, the cooling medium flows into the connecting flow channel 8 of the first first core segment 101 of the two first core segments 101 adjacent to the second core segment 102, and then enters the arc-shaped flow channel 9 of the second core segment 102, and then enters the connecting flow channel 8 of the next first core segment 101, so that the cooling medium can cover as much of the circumferential surface of the core body 1 as possible along the flow path of the arc-shaped flow channel 9, thereby improving the cooling effect on the core body 1.

[0070] In the present disclosure, the structural forms of the first core segment 101 and the second core segment 102 can also be diverse. For example, in an exemplary embodiment provided in the present disclosure, each first core segment 101 includes a plurality of first stator punching sheets 1011, and each second core segment 102 includes a plurality of second stator punching sheets 1021. The plurality of first stator punching sheets 1011 are stacked along the axial direction of the first core segment 101, and the plurality of second stator punching sheets 1021 are stacked along the axial direction of the second core segment 102. Different numbers of first stator punching sheets 1011 can be aligned and bonded to form first core segments 101 of different thicknesses. Similarly, different numbers of second stator punching sheets 1021 can also be aligned and bonded to form second core segments 102 of different thicknesses. Thus, the number of first core segments 101 and second core segments 102 can be flexibly set according to the thickness required by each.

[0071] Optionally, combined Figure 4 , Figure 6 and Figure 7A first through hole 10 is formed on each first stator punching sheet 1011, and the first through holes 10 on the multiple first stator punching sheets 1011 of each first core segment 101 are coaxial and interconnected to form a first straight sub-flow channel, and a second through hole 11 is formed on each second stator punching sheet 1021, and the second through holes 11 on the multiple second stator punching sheets 1021 of each second core segment 102 are coaxial and interconnected to form a second straight sub-flow channel; each first stator A third through hole 12 is formed on each of the sub-punches 1011. The third through holes 12 on the multiple first stator punches 1011 of each first core segment 101 are coaxial and interconnected to form a connecting flow channel 8. An arc groove 13 extending along the circumference of the second stator punch 1021 is formed on each of the second stator punches 1021. The arc grooves 13 on the multiple second stator punches 1021 of each second core segment 102 are aligned with each other and connected to form an arc flow channel 9.

[0072] Here, if Figure 6 As shown, it can be understood that the first through hole 10 of the first stator punching sheet 1011 located on the first end 26 of the core body 1 is the first liquid inlet 4, and the third through hole 12 of the first stator punching sheet 1011 located on the first end 26 of the core body 1 is the second liquid inlet 6; Figure 3 As shown, the first through hole 10 of the first stator punching sheet 1011 located on the second end 27 of the core body 1 is the first liquid outlet 5, and the third through hole 12 of the first stator punching sheet 1011 located on the second end 27 of the core body 1 is the second liquid outlet 7.

[0073] It should be noted that since the area of ​​the arcuate flow channel 9 formed by the arcuate groove 13 on the core body 1 is larger than the area of ​​the connecting flow channel 8 formed by the third through hole 12 on the core body 1, while ensuring the structural strength of the core body 1, the thickness of the second core segment 102 along the core body 1 can be set thicker than the first core segment 101 to increase the contact area between the cooling medium and the core body 1.

[0074] According to the second embodiment of the present disclosure, in combination with Fig. 9 , Fig.10 and Fig.11 The present disclosure also provides a stator assembly including a stator, and the stator includes the above-mentioned stator core.

[0075] Optionally, the stator assembly also includes a first cooling ring 14 and a second cooling ring 15, which are respectively located at both ends of the stator core along the axial direction of the stator core. The outer peripheral surface of the first cooling ring 14 can be used to define a first liquid storage chamber 16 between the inner wall of the motor housing 23, and the outer peripheral surface of the second cooling ring 15 can be used to define a second liquid storage chamber 17 between the inner wall of the motor housing 23. The first liquid inlet 4 and the second liquid inlet 6 are both connected to the first liquid storage chamber 16, and the first liquid outlet 5 and the second liquid outlet 7 are both connected to the second liquid storage chamber 17.

[0076] Optionally, the stator also includes a stator winding wound on the stator core, the stator winding having a first protrusion 18 protruding from the first end 26 of the stator core and a second protrusion 19 protruding from the second end 27 of the stator core, the first protrusion 18 is located on the inner side of the first cooling ring 14, the second protrusion 19 is located on the inner side of the second cooling ring 15, a first liquid spray port 20 is provided on the first cooling ring 14, and a second liquid spray port 21 is provided on the second cooling ring 15, the first liquid spray port 20 is connected to the first liquid storage chamber 16 and is used to spray liquid onto the first protrusion 18, and the second liquid spray port 21 is connected to the second liquid storage chamber 17 and is used to spray liquid onto the second protrusion 19.

[0077] It should be noted that the two ends of the stator core here are the first end 26 and the second end 27 of the core body 1 mentioned above, that is, the first cooling ring 14 can be set at the first end 26 of the core body 1, and the second cooling ring 15 can be set at the second end 27 of the core body 1.

[0078] Thus, in the process of injecting the cooling medium into the first liquid storage chamber 16, the cooling medium can fill the first liquid storage chamber 16, so that the cooling medium can be sprayed toward the first protrusion 18 through the first liquid injection port 20 provided on the first cooling ring 14, so as to cool down the first protrusion 18. Moreover, the first liquid inlet 4 and the second liquid inlet 6 are both connected to the first liquid storage chamber 16, that is, only by injecting the cooling medium into the first liquid storage chamber 16, the cooling medium can be provided to the straight flow channel portion 2 and the serpentine flow channel portion 3, and the first protrusion 18 can also be cooled. In addition, the cooling medium can also be quickly brought into the second liquid storage chamber 17 through the straight flow channel portion 2.

[0079] In conjunction with the embodiment of the present disclosure in which the first straight channel portion 201 and the second straight channel portion 202 are arranged to be opposite to each other in the vertical direction, the second liquid storage chamber 17 can be supplied with cooling medium from the upper part or from the lower part, so that the second liquid storage chamber 17 can be quickly filled and sprayed toward the second protruding portion 19 through the second liquid spray port 21 to quickly cool the second protruding portion 19. Moreover, the first liquid outlet 5 and the second liquid outlet 7 are both connected to the second liquid storage chamber 17, so that the cooling medium flowing through the serpentine flow channel portion 3 can also enter the second liquid storage chamber 17, increasing the flow rate of the cooling medium sprayed from the second liquid storage chamber 17 toward the second protruding portion 19.

[0080] As an exemplary embodiment, in order to achieve the spraying of the first protrusion 18 at multiple positions in the circumferential direction, a plurality of first spray outlets 20 are opened on the first cooling ring 14, and the plurality of first spray outlets 20 are evenly distributed along the circumference of the first cooling ring 14, and the first spray outlets 20 extend in the radial direction of the first cooling ring 14; similarly, in order to spray the second protrusion 19 at multiple positions in the circumferential direction, a plurality of second spray outlets 21 are opened on the second cooling ring 15, and the plurality of second spray outlets 21 are evenly distributed along the circumference of the second cooling ring 15, and the second spray outlets 21 extend in the radial direction of the second cooling ring 15.

[0081] Alternatively, if Fig.10 As shown, the first cooling ring 14 has a gradually expanding section 22, and the diameter of the gradually expanding section 22 gradually increases from the end of the gradually expanding section 22 close to the stator core to the end away from the stator core, and the first liquid injection port 20 is formed on the gradually expanding section 22. That is, after the cooling medium enters the first liquid storage chamber 16, the cooling medium can flow into the first liquid inlet 4 and the second liquid inlet 6 respectively and as much as possible under the guidance of the gradually expanding section 22, so as to quickly cool down the core body 1; because the first liquid injection port 20 is formed on the gradually expanding section 22, the opening area of ​​the first liquid injection port 20 can be increased, and the cooling medium can also be quickly and as much as possible sprayed to the first protrusion 18.

[0082] According to the third aspect of the present disclosure, the present disclosure also provides a motor, including a shell 23 and the above-mentioned stator assembly, the stator assembly is located in the shell 23, a liquid injection hole 24 is formed on the shell 23, and the first liquid inlet 4 and the second liquid inlet 6 are both connected to the liquid injection hole 24.

[0083] Based on the above-mentioned setting that both the first liquid inlet 4 and the second liquid inlet 6 are connected to the first liquid storage chamber 16, the cooling medium provided by the external liquid supply system to the injection hole 24 can be passed into the first liquid storage chamber 16 formed between the shell 23 and the first cooling ring 14. Therefore, only one injection hole 24 needs to be set on the shell 23, and the cooling medium provided by the external oil supply system to the injection hole 24 is passed into the first liquid storage chamber 16, so as to complete the distribution of the cooling medium, so as to achieve the cooling of the stator core and the stator winding. In addition, based on the embodiment in which the first straight flow channel portion 201 and the second straight flow channel portion 202 are set to be opposite in the up-down direction, the injection hole 24 can be set at the upper part of the shell 23.

[0084] Alternatively, if Fig. 9 As shown, a drainage hole 25 is also formed on the shell 23 , and one drainage hole 25 can be provided at a position close to the first cooling ring 14 and one at a position close to the second cooling ring 15 at the lower part of the shell 23 .

[0085] According to a fourth aspect of the present disclosure, the present disclosure also provides a drive assembly, comprising the above-mentioned motor.

[0086] According to a fifth aspect of the present disclosure, the present disclosure also provides a vehicle, comprising the above-mentioned drive assembly.

[0087] In actual application, the external liquid supply system supplies liquid to the top of the first liquid storage chamber 16 through the injection hole 24. Under the guidance of the gradually expanding section 22, the first liquid inlet 4, the second liquid inlet 6 and the first liquid spray port 20 can quickly pass the cooling medium, respectively realizing the rapid liquid inlet of the straight flow channel portion 2 to cool the core body 1 in the axial direction, the rapid liquid inlet of the serpentine flow channel portion 3 to cool the core body 1 in the circumferential direction, and the rapid cooling of the first protrusion 18; while the cooling medium in the straight flow channel portion 2 cools the core body 1 in the axial direction, it can also quickly flow into the second liquid storage chamber 17 and be sprayed toward the second protrusion 19 through the second liquid spray port 21 to cool the second protrusion 19, shorten the time difference between the cooling of the first protrusion 18 and the second protrusion 19, and ensure the cooling effect of the stator windings at both ends of the core body 1.

[0088] Because the external liquid supply system can adjust the flow rate of the cooling medium, after the flow rate of the cooling medium is increased, the cooling medium can quickly fill the first liquid storage chamber 16, so that the cooling medium can cool down the first protrusion 18 through the multiple first liquid spraying ports 20 along the circumference of the first cooling ring 14. Moreover, after the lower part of the first liquid storage chamber 16 is filled with oil, the cooling medium can be introduced into the second linear flow channel portion 202 below the first linear flow channel portion 201 to speed up the filling of the cooling medium, so that the cooling medium can cool down the second protrusion 19 through the multiple second liquid spraying ports 21 along the circumference of the second cooling ring 15. After the cooling medium has completed the heat exchange with the stator core and the stator winding, it is discharged through the drain hole 25 and enters the external oil supply system for cooling, and then enters the injection hole 24, and the cycle is repeated to continuously cool down the stator core and the stator winding.

[0089] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0090] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0091] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A stator core, characterized in that: It includes an iron core body, on which a straight flow channel portion and a serpentine flow channel portion are formed, the straight flow channel portion has a first liquid inlet on the first end of the iron core body, the straight flow channel portion has a first liquid outlet on the second end of the iron core body, the serpentine flow channel portion has a second liquid inlet on the first end of the iron core body, and the serpentine flow channel portion has a second liquid outlet on the second end of the iron core body, the straight flow channel portion and the serpentine flow channel portion are independent of each other, and the straight flow channel portion extends along the axial direction of the iron core body and penetrates the iron core body.

2. The stator core according to claim 1, characterized in that: There are multiple straight flow channel portions and multiple serpentine flow channel portions. The multiple straight flow channel portions and the multiple serpentine flow channel portions are arranged at intervals along the circumference of the core body, and the straight flow channel portions and the serpentine flow channel portions are alternately arranged along the circumference of the core body.

3. The stator core according to claim 2, characterized in that: The plurality of straight flow channel portions include a first straight flow channel portion and a second straight flow channel portion, wherein the first straight flow channel portion and the second straight flow channel portion are opposite to each other along the radial direction of the core body; The multiple serpentine flow channel portions include a first serpentine flow channel portion and a second serpentine flow channel portion, the first serpentine flow channel portion is located between one side of the first straight flow channel portion and one side of the second straight flow channel portion, and the second serpentine flow channel portion is located between the other side of the first straight flow channel portion and the other side of the second straight flow channel portion.

4. The stator core according to claim 3, characterized in that: The second liquid inlet of the first serpentine flow channel portion and the second liquid inlet of the second serpentine flow channel portion are both adjacent to the first liquid inlet of the first straight flow channel portion; and / or, the second liquid outlet of the first serpentine flow channel portion and the second liquid outlet of the second serpentine flow channel portion are both adjacent to the first liquid outlet of the first straight flow channel portion.

5. The stator core according to claim 4, characterized in that: An area of ​​the second liquid inlet of the first serpentine flow channel portion and an area of ​​the second liquid inlet of the second serpentine flow channel portion are both larger than an area of ​​the first liquid inlet of the first straight flow channel portion.

6. The stator core according to claim 1, characterized in that: The linear flow channel portion includes a plurality of linear flow channels, and the plurality of linear flow channels are arranged side by side along the circumferential direction of the core body, and each of the linear flow channels extends along the axial direction of the core body and penetrates the core body.

7. The stator core according to claim 1, characterized in that: The serpentine flow channel portion includes a plurality of arc-shaped flow channels, each of which extends along the circumference of the core body, and the plurality of arc-shaped flow channels are arranged along the axial direction of the core body and connected end to end.

8. The stator core according to any one of claims 1 to 7, characterized in that: The core body comprises a plurality of first core segments and a plurality of second core segments, wherein the first core segments and the second core segments are alternately arranged along the axial direction of the core body, and the first core segments and the second core segments are stacked along the axial direction of the core body; The linear flow channel portion includes at least one linear flow channel, each of the first core segments is formed with a first linear sub-flow channel extending along the axial direction of the first core segment and penetrating the first core segment, each of the second core segments is formed with a second linear sub-flow channel extending along the axial direction of the second core segment and penetrating the second core segment, and the first linear sub-flow channel and the second linear sub-flow channel are connected to each other to form the linear flow channel; A connecting flow channel penetrating the first core segment is formed on each of the first core segments, and an arcuate flow channel extending along the circumference of the second core segment is formed on each of the second core segments. One end of the arcuate flow channel on each of the second core segments is connected to a connecting flow channel on a first core segment adjacent to the second core segment, and the other end of the arcuate flow channel on each of the second core segments is connected to a connecting flow channel on another first core segment adjacent to the second core segment. The connecting flow channel and the arcuate flow channel together constitute the serpentine flow channel portion.

9. The stator core according to claim 8, characterized in that: The communication channel on one of the two first core segments adjacent to the second core segment is centrally symmetrical with the communication channel on the other first core segment about the central axis of the core body.

10. The stator core according to claim 8, characterized in that: Each of the first core segments includes a plurality of first stator punching sheets, and each of the second core segments includes a plurality of second stator punching sheets, wherein the plurality of first stator punching sheets are stacked along the axial direction of the first core segment, and the plurality of second stator punching sheets are stacked along the axial direction of the second core segment; A first through hole is formed on each of the first stator punching sheets, and the first through holes on the plurality of first stator punching sheets of each of the first core segments are coaxial and interconnected to form the first straight sub-flow channel; a second through hole is formed on each of the second stator punching sheets, and the second through holes on the plurality of second stator punching sheets of each of the second core segments are coaxial and interconnected to form the second straight sub-flow channel; A third through hole is formed on each of the first stator punching sheets, and the third through holes on the multiple first stator punching sheets of each of the first core segments are coaxial and interconnected to form the connecting flow channel. An arcuate groove extending along the circumferential direction of the second stator punching sheet is formed on each of the second stator punching sheets, and the arcuate grooves on the multiple second stator punching sheets of each of the second core segments are aligned with each other and connected to form the arcuate flow channel.

11. A stator assembly, characterized in that: It comprises a stator, wherein the stator comprises the stator core according to any one of claims 1 to 10.

12. The stator assembly according to claim 11, characterized in that The stator assembly also includes a first cooling ring and a second cooling ring, the first cooling ring and the second cooling ring are respectively located at two ends of the stator core along the axial direction of the stator core, the outer circumferential surface of the first cooling ring can be used to define a first liquid storage cavity between the first cooling ring and the inner wall of the motor housing, the outer circumferential surface of the second cooling ring can be used to define a second liquid storage cavity between the second cooling ring and the inner wall of the motor housing, the first liquid inlet and the second liquid inlet are both connected to the first liquid storage cavity, and the first liquid outlet and the second liquid outlet are both connected to the second liquid storage cavity.

13. The stator assembly according to claim 12, characterized in that The stator also includes a stator winding wound on the stator core, the stator winding having a first protrusion protruding from a first end of the stator core and a second protrusion protruding from a second end of the stator core, the first protrusion being located on an inner side of the first cooling ring, the second protrusion being located on an inner side of the second cooling ring, a first liquid spraying port being provided on the first cooling ring, a second liquid spraying port being provided on the second cooling ring, the first liquid spraying port being connected to the first liquid storage chamber and used for spraying liquid onto the first protrusion, the second liquid spraying port being connected to the second liquid storage chamber and used for spraying liquid onto the second protrusion.

14. The stator assembly according to claim 13, characterized in that The first cooling ring has a gradually expanding section, and the diameter of the gradually expanding section gradually increases along the direction from one end of the gradually expanding section close to the stator core to one end away from the stator core, and the first liquid injection port is formed on the gradually expanding section.

15. A motor, characterized in that: It comprises a shell and a stator assembly according to any one of claims 11 to 14, wherein the stator assembly is located in the shell, a liquid injection hole is formed on the shell, and the first liquid inlet and the second liquid inlet are both connected to the liquid injection hole.

16. A drive assembly, characterized in that: Includes the motor as claimed in claim 15.

17. A vehicle, characterized in that: Comprising the drive assembly as claimed in claim 16.

Images