Motor and vehicle

Abstract

The invention discloses a motor and a vehicle, and relates to the technical field of motors, the motor comprises a shell and a stator fixed in the shell, a stator core of the stator comprises first punching sheet units arranged at two axial ends and a second punching sheet unit arranged between the two first punching sheet units, the first punching sheet unit is provided with a plurality of first flow channels which are arranged at intervals in the circumferential direction, the first flow channels of the two first punching sheet units are arranged in a staggered manner in the circumferential direction of the stator core, the second punching sheet unit is provided with a plurality of second flow channels which are arranged at intervals in the circumferential direction, and the second flow channels penetrate through the two axial ends of the second punching sheet unit; the first flow channel and the second flow channel of one first punching sheet unit, and the first flow channel and the other second flow channel of the other first punching sheet unit are sequentially and alternately connected in a reciprocating mode so as to form a cooling flow path which continuously extends in a zigzag mode in the circumferential direction of the stator iron core. According to the technical scheme provided by the invention, the circumferential 360-degree cooling of the stator core is realized, the motor performance is improved, and the vehicle performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor and a vehicle. Background Art

[0002] As a core component of a motor, the stator generates significant heat during operation due to electromagnetic losses and mechanical friction. If this heat cannot be dissipated promptly, the stator's temperature will rise excessively, affecting motor efficiency, insulation life, and even causing equipment failure. Therefore, stator cooling technology is crucial.

[0003] Currently, common cooling methods include air cooling, water cooling, and oil cooling. Oil cooling uses insulating oil as the cooling medium, providing both heat dissipation and insulation. However, traditional oil cooling methods, such as spraying and immersion, often fail to achieve 360° cooling of the stator core's circumference. Summary of the Invention

[0004] The main purpose of the present invention is to propose a motor and a vehicle, aiming to achieve 360° surrounding cooling of the stator core in the circumferential direction, improve the cooling effect of the stator in its circumferential direction, enhance the performance of the motor, and enhance the performance of the vehicle.

[0005] To achieve the above-mentioned object, the motor proposed in the present invention includes:

[0006] housing; and

[0007] A stator is fixed in the housing, the stator comprising a stator core and a stator winding, the stator core comprising a first punching unit provided at both axial ends and a second punching unit provided between the two first punching units, the first punching unit being provided with a plurality of first flow channels spaced apart in the circumferential direction, and the plurality of first flow channels of each of the two first punching units being staggered in the circumferential direction of the stator core, the second punching unit being provided with a plurality of second flow channels spaced apart in the circumferential direction, the second flow channels passing through both axial ends of the second punching unit;

[0008] For the multiple first flow channels, multiple second flow channels of a first punching sheet unit and the multiple first flow channels of another first punching sheet unit, the first flow channels of a first punching sheet unit, the second flow channels, the first flow channels of another first punching sheet unit and the second flow channels are connected in an alternating and reciprocating manner to form a coolant flow path extending in a continuous tortuous manner in the circumferential direction of the stator core.

[0009] In one embodiment, the first punching unit includes a first punching group and a second punching group stacked together, the second punching group is located on a side of the first punching group close to the second punching unit, the first flow channel is configured as a first liquid flow groove provided in the second punching group and axially passing through the second punching group, the first punching group blocks one axial end of the first liquid flow groove; the second flow channel is configured as a second liquid flow groove provided in the second punching unit and axially passing through the second punching unit.

[0010] In one embodiment, a liquid inlet channel is provided on the shell, the stator core is connected to the shell via a bolt locking structure, the bolt locking structure has a flow gap, and the liquid inlet channel is connected to the first liquid flow trough or the second liquid flow trough through the flow gap.

[0011] In one embodiment, a first lug is provided on an inner wall of the housing, and the bolt locking structure includes a first connecting hole provided on the first lug, a second connecting hole provided on the stator core and extending axially therethrough, and a bolt, wherein the flow gap is provided between the bolt and the first connecting hole and the second connecting hole.

[0012] The liquid inlet channel includes a liquid inlet hole provided on the housing, the liquid inlet hole is communicated with the first connecting hole, and the second connecting hole is communicated with the first liquid passage trough or the second liquid passage trough.

[0013] In one embodiment, the first connecting hole includes a coaxially connected threaded hole section and a light hole section, the diameter of the light hole section is larger than the diameter of the threaded hole section, the liquid inlet hole is connected to the light hole section, and the second connecting hole is configured as a light hole. The bolt passes through the second connecting hole and the light hole section in sequence and is screwed into the threaded hole section to lock the stator core to the first lug, and the flow gap is formed between the light hole section, the light hole and the bolt.

[0014] In one embodiment, at least the second punching plate group close to the liquid inlet is further provided with a guide notch, and the guide notch is connected to the second connecting hole and the first liquid flow channel.

[0015] In one embodiment, the first liquid flow groove extends in the circumferential direction, and the guide notch is connected to the middle part of the first liquid flow groove. After the coolant enters the first liquid flow groove from the liquid inlet hole through the guide notch, it can flow in the circumferential direction to the circumferential ends of the first liquid flow groove, and then flow in the axial direction to the two second liquid flow grooves respectively.

[0016] In one embodiment, the motor further includes oil rings provided at both ends of the stator core, the oil rings abutting against the first punching sheet group, the oil rings being provided with a connected input hole and a plurality of output holes, the first punching sheet group being provided with at least one first liquid outlet hole connected to the first liquid flow groove, the input hole being connected to the first liquid outlet hole, and the plurality of output holes being arranged at intervals along the circumference of the oil ring, and the output holes being used to lead the coolant to the stator winding.

[0017] In one embodiment, the output hole is provided on an end surface of the oil ring that is away from the stator core, and the output hole is inclined toward the center of the oil ring.

[0018] The present invention also provides a vehicle comprising the motor.

[0019] The technical solution of the present invention is to provide a shell and a stator fixed in the shell in the motor, the stator including a stator core and a stator winding, the stator core including a first punching unit provided at both axial ends and a second punching unit provided between the two first punching units, the first punching unit and the second punching unit respectively provided with a plurality of first flow channels and a plurality of second flow channels spaced apart along their circumferential directions, wherein the plurality of first flow channels of each of the two first punching units are staggered in the circumferential direction of the stator core, and the second flow channels extend axially and pass through the second punching unit; the plurality of first flow channels, the plurality of second flow channels of a first punching unit and the plurality of first flow channels of another first punching unit are connected in an alternating reciprocating manner in such a manner that the first flow channel of a first punching unit, the second flow channel, the first flow channel of another first punching unit and the second flow channel are alternately connected in sequence to form a cooling liquid flow path extending in a continuous tortuous manner in the circumferential direction of the stator core. In this way, the coolant can flow along an S-shaped path on the stator core, so that the coolant can cool the stator core 360° in the circumferential direction, thereby improving the full coverage of the circumferential cooling of the stator core, which is beneficial to improving the cooling effect of the stator core, and is beneficial to improving the cooling effect of the stator, and then is beneficial to improving the performance of the motor and the performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of an embodiment of a motor provided by the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the exploded structure of an embodiment of the stator core;

[0023] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of the second punching sheet group;

[0024] Figure 4 for Figure 2 A structural diagram of an embodiment in which a portion of the outer peripheral wall of the stator core is removed after removing a first punching sheet group;

[0025] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0026] Figure 6 for Figure 1 sectional view of

[0027] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0028] Figure 8 for Figure 1 A structural schematic diagram of an embodiment of the first lug from another perspective;

[0029] Figure 9 for Figure 1 A schematic structural diagram of an end face of an embodiment of an oil ring;

[0030] Figure 10 for Figure 1 A schematic structural diagram of another end surface of another embodiment of the oil ring in FIG.

[0031] Description of Figure Numbers:

[0032] 100, housing; 110, liquid inlet channel; 111, liquid inlet hole; 120, first lug; 121, first connecting hole; 1211, threaded hole section; 1212, smooth hole section; 130, second lug; 131, first fixing hole; 140, liquid inlet nozzle;

[0033] 200, stator;

[0034] 300, stator core;

[0035] 310, first punching unit; 3101, first flow channel; 3102, first liquid trough; 311, first punching group; 3111, first liquid outlet; 312, second punching group; 3121, guide notch;

[0036] 320, second punching unit; 3201, second flow channel; 3202, second liquid flow channel; 330, second connecting hole; 340, connecting protrusion;

[0037] 400, stator winding;

[0038] 500, bolt locking structure; 510, bolt; 520, flow clearance;

[0039] 600 , oil ring; 610 , input hole; 620 , output hole; 630 , second fixing hole; 640 , fixing protrusion.

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] As a core component of a motor, the stator generates significant heat during operation due to electromagnetic losses and mechanical friction. If this heat cannot be dissipated promptly, the stator's temperature will rise excessively, affecting motor efficiency, insulation life, and even causing equipment failure. Therefore, stator cooling technology is crucial.

[0045] Common cooling methods currently include air cooling, water cooling, and oil cooling. Oil cooling uses insulating oil as the cooling medium, providing both heat dissipation and insulation. However, traditional oil cooling methods, such as spraying and immersion, often fail to achieve uniform cooling of the stator circumference, leading to localized hot spots.

[0046] The present invention provides a motor.

[0047] See also Figures 1 to 5 In one embodiment of the present invention, the motor includes a housing 100 and a stator 200 fixed in the housing 100. The stator 200 includes a stator core 300 and a stator winding 400. The stator core 300 includes a first punching unit 310 provided at both axial ends and a second punching unit 320 provided between the two first punching units 310. The first punching unit 310 and the second punching unit 320 are respectively provided with a plurality of first flow channels 3101 spaced apart along their circumferential directions, and the plurality of first flow channels 3101 of each of the two first punching units 310 are staggered in the circumferential direction of the stator core 300. The second punching unit 320 is provided with a plurality of second flow channels 3201 spaced apart in the circumferential direction, and the second flow channels 3201 pass through both axial ends of the second punching unit 320.

[0048] For the multiple first flow channels 3101 of a first punching sheet unit 310, the multiple second flow channels 3201 and the multiple first flow channels 3101 of another first punching sheet unit 310, the first flow channel 3101 of a first punching sheet unit 310, the second flow channel 3201, the first flow channel 3101 of another first punching sheet unit 310, and the other second flow channel 3201 are connected in an alternating reciprocating manner to form a cooling liquid flow path extending in a continuous tortuous direction in the circumferential direction of the stator core 300.

[0049] Understandable, see Figure 1 , stator 200 is connected by bolt 510 (such as Figure 7 The stator 200 is fixed to the housing 100 (as shown), thereby achieving the connection and installation between the stator 200 and the housing 100. The stator 200 comprises a stator core 300 and stator windings 400. The stator windings 400 are the core conductive components of the stator 200 and are responsible for generating an alternating magnetic field to drive the rotor. In one embodiment, the inner wall of the stator core 300 is provided with a plurality of slots spaced apart along its circumference. The stator windings 400 are embedded in the slots and emerge from both axial ends of the stator core 300.

[0050] See also Figure 2The stator core 300 is formed by stacking a plurality of stator punching sheets. A plurality of stator punching sheets can be stacked to form a punching sheet group, and a plurality of punching sheet groups can be stacked to form a punching sheet unit. In one embodiment, the stator core 300 includes two first punching sheet units 310 and one second punching sheet unit 320, wherein the two first punching sheet units 310 are located at both ends of the axial direction of the stator 200, and a second punching sheet unit 320 is located between the two first punching sheet units 310. The first punching sheet unit 310 is provided with a plurality of first flow channels 3101 spaced apart along its circumference. For convenience of explanation, the stator 200 is defined as having opposite first and second ends in the axial direction, that is, the two first punching sheet units 310 include the first punching sheet unit 310 at the first end and the first punching sheet unit 310 at the second end. In the circumferential direction of the stator core 300, the first flow channels 3101 at the first end and the first flow channels 3101 at the second end are staggered. In one embodiment, the first flow channels 3101 on the two first punching sheet units 310 are configured identically. When assembling the stator core 300, one first punching sheet unit 310 is rotated circumferentially by a certain angle relative to the other first punching sheet unit 310, thereby achieving a staggered arrangement of the first flow channel 3101 at the first end and the first flow channel 3101 at the second end.

[0051] The second punching unit 320 is provided with a plurality of second flow channels 3201 spaced apart along its circumference, wherein the second flow channels 3201 extend axially and penetrate the second punching unit 320. That is, in the axial direction of the stator core 300, the second flow channel 3201 has two opposite flow channel openings, which are respectively connected to the first flow channel 3101 at the first end and the first flow channel 3101 at the second end.

[0052] It is understandable that the second punching unit 320 is composed of a plurality of punching sheets stacked together. In one embodiment, the plurality of punching sheets in the second punching unit 320 have the same structure and are aligned in the circumferential direction. In this case, the cross-section of the second flow channel 3201 is roughly rectangular, and the second flow channel 3201 is configured as a straight flow channel. Of course, the plurality of punching sheets in the second punching unit 320 can also be slightly staggered in the circumferential direction, as long as the second flow channel 3201 composed of the plurality of punching sheets can be vertically connected in the axial direction. In another embodiment, the plurality of punching sheets in the second punching unit 320 can also have different structures, as long as the second flow channel 3201 composed of the plurality of punching sheets with different structures can be vertically connected in the axial direction.

[0053] See also Figure 4 and Figure 5In the stator core 300, the first flow channel 3101 at the first end, the second flow channel 3201, the first flow channel 3101 at the second end, the other second flow channel 3201, and the other first flow channel 3101 at the first end are alternately connected in a reciprocating manner, thereby forming an S-shaped coolant flow path on the stator core 300. It will be appreciated that the first flow channel 3101 and the second flow channel 3201 both have a certain extension width in the circumferential direction, and the coolant can flow in the circumferential direction of the first flow channel 3101 as well as the circumferential direction of the second flow channel 3201. Specifically, the coolant flows axially through the first flow channel 3101 at the first end to the second flow channel 3201, and then flows axially to the first flow channel 3101 at the second end. The coolant flows circumferentially in the first flow channel 3101 at the second end to flow to another second flow channel 3201, and then reverses axially from the second flow channel 3201 to the first flow channel 3101 at the first end, and so on. This allows the coolant to flow along an "S"-shaped flow path in the stator core 300, so that the coolant can cool the stator core 300 360° in the circumferential direction, which is beneficial to improving the cooling effect of the stator core 300, and is beneficial to improving the cooling effect of the stator 200, and further beneficial to improving the performance of the motor. It is worth noting that Figure 4 and Figure 5 The straight arrows in the figure indicate the direction of coolant flow.

[0054] It is understandable that the stator core 300 is further provided with a liquid inlet channel 110 (such as Figure 6 As shown) and the liquid outlet channel (not shown), the liquid inlet channel 110 is used to introduce the external coolant into the first channel 3101 and the second channel 3201, and the liquid outlet channel is used to lead the cooled coolant out of the stator core 300 from the first channel 3101. It can be understood that the coolant can only flow out of the stator core 300 from the liquid outlet channel. In order to prevent the coolant from flowing out of the stator core 300 axially from the first channel 3101, the first channel 3101 cannot penetrate the first punching unit 310 (as shown) in the axial direction. Figure 4 shown).

[0055] It is understood that to ensure the cooling effect of the coolant flowing along the S-shaped path on the stator core 300, the thickness of the first punching unit 310 is less than the thickness of the second punching unit 320. The thickness of the first punching unit 310 and the second punching unit 320 can be set based on factors such as the power of the motor and the structural strength of the stator punching, and is not limited herein. It is worth noting that the thickness direction is the axial direction of the stator 200.

[0056] The technical solution of the present invention is to set a housing 100 and a stator 200 fixed in the housing 100 in the motor, the stator 200 includes a stator core 300 and a stator winding 400, the stator core 300 includes a first punching unit 310 provided at both ends of the axial direction and a second punching unit 320 provided between the two first punching units 310, the first punching unit 310 and the second punching unit 320 are respectively provided with a plurality of first flow channels 3101 and a plurality of second flow channels 3201 at intervals along the circumference thereof, wherein the plurality of first flow channels 3101 of each of the two first punching units 310 are arranged in the stator core 300. The second flow channels 3201 extend axially and penetrate the second punching sheet unit 320; the multiple first flow channels 3101, the multiple second flow channels 3201 of a first punching sheet unit 310 and the multiple first flow channels 3101 of another first punching sheet unit 310 are connected in an alternating manner in which the first flow channel 3101 of a first punching sheet unit 310, the second flow channel 3201, the first flow channel 3101 of another first punching sheet unit 310 and the second flow channel 3201 are alternately connected in sequence to form a coolant flow path extending in a continuous zigzag manner in the circumferential direction of the stator core 300. In this way, the coolant can flow along an S-shaped path on the stator core 300, so that the coolant can cool the stator core 300 360° in the circumferential direction, thereby improving the full coverage of the circumferential cooling of the stator core 300, which is beneficial to improving the cooling effect of the stator core 300, and is beneficial to improving the cooling effect of the stator 200, and further beneficial to improving the performance of the motor and the performance of the vehicle.

[0057] See also Figures 2 to 5 In an embodiment of the present invention, the first punching unit 310 includes a stacked first punching group 311 and a second punching group 312. The second punching group 312 is located on a side of the first punching group 311 close to the second punching unit 320. The first flow channel 3101 is configured as a first liquid flow groove 3102 provided in the second punching group 312 and axially passing through the second punching group 312. The first punching group 311 blocks one axial end of the first liquid flow groove 3102. The second flow channel 3201 is configured as a second liquid flow groove 3202 provided in the second punching unit 320 and axially passing through the second punching unit 320.

[0058] It is understandable that in the present invention Figure 2In the embodiment shown in FIG, a first liquid-passing groove 3102 is provided axially through the second punching sheet group 312, and a second liquid-passing groove 3202 is provided axially through the second punching sheet unit 320. That is, both the first liquid-passing groove 3102 and the second liquid-passing groove 3202 are provided in the stator yoke of the stator core 300, and in the radial direction of the stator core 300, the first liquid-passing groove 3102 and the second liquid-passing groove 3202 are provided at positions away from the axis of the stator core 300. Thus, when machining the stator core 300, punching can be achieved by directly punching the second punching sheet group 312 and the second punching sheet unit 320.

[0059] As will be appreciated, the stator core 300 is provided with a liquid outlet channel, as mentioned above. In the present invention, the liquid outlet channel is provided at both axial ends of the stator core 300 to direct coolant to the stator windings 400 at both axial ends of the stator core 300, further cooling the stator windings 400 at both ends. To prevent coolant from flowing out of the stator core 300 through the first liquid passage trough 3102 outside of the liquid outlet channel, the end of the first liquid passage trough 3102 away from the second liquid passage trough 3202 needs to be blocked.

[0060] More specifically, the first punch unit 310 includes a stacked first punch group 311 and a second punch group 312, wherein the second punch group 312 is disposed adjacent to the second punch unit 320. A first liquid trough 3102 is disposed in the second punch group 312, and the first liquid trough 3102 axially extends through the second punch group 312. A liquid outlet channel is disposed in the first punch group 311. In one embodiment, the liquid outlet channel is configured as a first liquid outlet hole 3111 disposed in the first punch group 311. In the axial direction, the first liquid outlet hole 3111 is connected to at least one first liquid trough 3102, thereby leading the cooled coolant out of the stator core 300. It is understood that the first punch group 311 intercepts the coolant at a position outside the first liquid outlet hole 3111 to ensure an S-shaped flow of the coolant in the stator core 300. That is, when the first punching plate group 311 and the second punching plate group 312 are overlapped, the first punching plate group 311 blocks one axial end of the first liquid passage trough 3102 except for the position of the first liquid outlet 3111 .

[0061] Thus, compared with the method of providing ribs on the outer wall of the stator core 300 and forming flow channels using the spaces between adjacent ribs, the structure of the stator core 300 of the present invention is simpler and also helps to reduce the weight of the stator 200.

[0062] See also Figure 6 and Figure 7In an embodiment of the present invention, a liquid inlet channel 110 is provided on the housing 100, and the stator core 300 is connected to the housing 100 through a bolt locking structure 500. The bolt locking structure 500 has a flow gap 520, and the liquid inlet channel 110 is connected to the first liquid flow tank 3102 or the second liquid flow tank 3202 through the flow gap 520.

[0063] Understandable, see Figure 1 and Figure 6 The housing 100 is provided with a liquid inlet channel 110. In one embodiment, the liquid inlet channel 110 can be used to install a liquid inlet nozzle 140. The liquid inlet nozzle 140 can be connected to an external coolant tank through an external liquid inlet pipeline to introduce coolant. Figure 7 The stator core 300 is connected to the inner wall of the housing 100 via a bolt locking structure 500. Typically, a flow gap 520 is defined between the bolt locking structure 500 and the inner wall of the stator core 300 and the housing 100. It is understood that the flow gap 520 refers to the gap between the bolt 510 in the bolt locking structure 500 and the bolt hole through which the bolt 510 passes. The bolt 510 extends axially along the stator core 300, and the flow gap 520 also extends axially therewith. The flow gap 520 communicates with the liquid inlet channel 110 and is also connected to the first liquid flow channel 3102 or the second liquid flow channel 3202.

[0064] Specifically, see Figure 5 and Figure 7 When the liquid inlet channel 110 is connected to the first liquid flow channel 3102 through the flow gap 520, the liquid inlet channel 110 is provided at the axial end of the stator core 300 and is able to communicate with the flow gap 520 between the first punching unit 310 and the bolt 510. At this time, the coolant flows in the following order: the liquid inlet channel 110 - the flow gap 520 - the first liquid flow channel 3102 - the second liquid flow channel 3202 - the other first liquid flow channel 3102, alternating in sequence, thereby forming an "S"-shaped flow of the coolant.

[0065] When the liquid inlet channel 110 is connected to the second liquid flow channel 3202 through the flow gap 520, the liquid inlet channel 110 is located in the middle of the axial direction of the stator core 300 and can be connected to the flow gap 520 between the second punching unit 320 and the bolt 510. At this time, the flow path of the coolant is the liquid inlet channel 110-flow gap 520-second liquid flow channel 3202, and then it is divided into two paths, flowing toward the axial ends of the second liquid flow channel 3102 respectively, flowing to the first liquid flow channel 3102 at the first end and the second end, and then flowing from the two first liquid flow channels 3102 to the other second liquid flow channels 3202 connected to each other, so that the coolant flows in an "S" shape.

[0066] It is understood that in one embodiment, the liquid inlet channel 110 can be a liquid inlet pipe that extends into the housing 100, and the liquid outlet end of the liquid inlet pipe can be connected to the flow gap 520. At the same time, it is necessary to ensure the sealing between the liquid inlet channel 110 and the flow gap 520 to prevent leakage of the coolant.

[0067] In this way, the coolant can flow from the liquid inlet channel 110 into the flow gap 520 of the bolt locking structure 500, and then into the first liquid flow channel 3102 or the second liquid flow channel 3202, thereby cooling the stator core 300. In this way, the coolant flow path uses the flow gap 520 of the bolt locking structure 500, avoiding the need for additional communication paths and simplifying the structure of the stator core 300.

[0068] It can be understood that in the stator 200, the stator core 300 can be connected to the housing 100 through multiple bolt locking structures 500. One or more liquid inlet channels 110 can be provided. When one liquid inlet channel 110 is provided, the unit volume of coolant flows in the stator core 300 in an S-shape along the circumference for 360° and then flows out of the stator core 300, so that the unit volume of coolant can take away more heat. When multiple liquid inlet channels 110 are provided, correspondingly, multiple liquid outlet channels are provided so that the coolant flowing into one liquid inlet channel 110 can flow out from its corresponding liquid outlet channel. In this way, multiple S-shaped channels are formed in the stator core 300, and the multiple S-shaped channels are connected end to end and arranged along the circumference of the stator core 300 to cool the stator core 300 360° in the circumference. In this way, the flow path and flow time of the cooling liquid per unit volume can be shortened, which is beneficial to improving the cooling effect and cooling uniformity.

[0069] In one embodiment, when the liquid inlet channel 110 is connected to the first liquid flow channel 3102 via the flow gap 520, only one liquid inlet channel 110 may be provided in the axial direction, that is, the liquid inlet channel 110 is connected only to the first liquid flow channel 3102 at one axial end of the stator core 300. Of course, two liquid inlet channels 110 may also be provided, that is, the two liquid inlet channels 110 are respectively connected to the two first liquid flow channels 3102 at the two axial ends of the stator core 300. The following description uses the example of a single liquid inlet channel 110, and the liquid inlet channel 110 is connected only to the first liquid flow channel 3102 at one axial end of the stator core 300.

[0070] See also Figure 2 、 Figure 7 and Figure 8In an embodiment of the present invention, a first lug 120 is provided on the inner wall of the housing 100. The bolt locking structure 500 includes a first connecting hole 121 provided on the first lug 120, a second connecting hole 330 axially extending through the stator core 300, and a bolt 510. A flow gap 520 is defined between the bolt 510 and the first connecting hole 121 and the second connecting hole 330. The liquid inlet channel 110 includes a liquid inlet hole 111 provided on the outer wall of the housing 100. The liquid inlet hole 111 is connected to the first connecting hole 121, and the second connecting hole 330 is connected to the first liquid flow trough 3102 or the second liquid flow trough 3202.

[0071] As will be understood, the bolt locking structure 500 includes a first connection hole 121, a second connection hole 330, and a bolt 510. The inner wall of the housing 100 is provided with an inwardly protruding first lug 120. The first connection hole 121 is located on the first lug 120 and extends axially. The first connection hole 121 is configured as a blind hole. The stator yoke of the stator core 300 is formed with a connection protrusion 340 at a position away from the axis. The second connection hole 330 is located on the connection protrusion 340 and axially penetrates the stator core 300. As will be understood, the first connection hole 121 is a threaded hole, while the second connection hole 330 is a plain hole. To connect the stator core 300 and the housing 100, the stator core 300 is placed within the housing 100, with one axial end of the stator core 300 aligned with the first lug 120 of the housing 100. This aligns the second connection hole 330 of the stator core 300 with the first connection hole 121 of the first lug 120 of the housing 100. A bolt 510 is inserted through the second connection hole 330 and the first connection hole 121, with the external thread of the bolt 510 threadedly engaged with the internal thread of the first connection hole 121, thereby connecting the stator core 300 and the housing 100. The bolt locking structure 500 is a clearance fit, meaning there is a thread gap between the bolt 510 and the threaded first connection hole 121, and a connection gap between the outer wall of the bolt 510 and the inner wall of the second connection hole 330. After the bolt 510 passes through the first connection hole 121 and the second connection hole 330, the thread gap and the connection gap connect to form a flow gap 520.

[0072] See also Figure 7 and Figure 8 In one embodiment, the liquid inlet channel 110 includes a liquid inlet hole 111 disposed on the outer wall of the housing 100, extending radially along the motor. When the liquid inlet hole 111 is located at the first lug 120 of the housing 100, the liquid inlet end of the liquid inlet hole 111 is connected to the liquid inlet nozzle 140, and the liquid outlet end of the liquid inlet hole 111 is connected to the first connecting hole 121. The first connecting hole 121 is in turn connected to the second connecting hole 330, which is in turn connected to the first liquid transfer groove 3102 or the second liquid transfer groove 3202, thereby introducing coolant into the stator core 300.

[0073] It can be understood that the second connecting hole 330 is provided on the two first punching units 310 and the second punching unit 320, the first liquid passage groove 3102 is provided in the second punching group 312 of the first punching unit 310, and the second liquid passage groove 3202 is provided in the second punching unit 320. Along the radial direction of the stator core 300, the second connecting hole 330 is located outside the first liquid passage groove 3102 and the second liquid passage groove 3202 (such as Figure 2 and Figure 3 When the second connecting hole 330 is connected to the first liquid flow channel 3102, in one embodiment, a radial flow channel is provided in the second punching plate group 312 to connect the second connecting hole 330 and the first liquid flow channel 3102. When the second connecting hole 330 is connected to the second liquid flow channel 3102, in one embodiment, a radial flow channel is provided in the second punching plate unit 320 to connect the second connecting hole 330 and the second liquid flow channel 3202. The following description takes the connection between the second connecting hole 330 and the first liquid flow channel 3102 as an example.

[0074] It is understood that there is a gap between the outer wall of the stator core 300 and the inner wall of the housing 100. When the liquid inlet channel 110 is configured as a liquid inlet hole 111 provided in the housing 100, the liquid inlet hole 111 must be provided at a position corresponding to the first lug 120 to prevent the coolant from leaking through the gap between the outer wall of the stator core 300 and the inner wall of the housing 100 after entering through the liquid inlet hole 111 when the liquid inlet hole 111 is provided at a position other than the position corresponding to the first lug 120. Of course, in other embodiments, when the liquid inlet channel 110 is configured as a liquid inlet pipe, the liquid inlet pipe can be provided at a position other than the position corresponding to the first lug 120, that is, the liquid inlet pipe can be connected to the second connecting hole 330.

[0075] See also Figure 5 and Figure 7 In an embodiment of the present invention, the first connecting hole 121 includes a coaxially connected threaded hole section 1211 and a light hole section 1212. The diameter of the light hole section 1212 is larger than the diameter of the threaded hole section 1211. The liquid inlet hole 111 is connected to the light hole section 1212. The second connecting hole 330 is configured as a light hole. The bolt 510 passes through the second connecting hole 330 and the light hole section 1212 in sequence and is screwed into the threaded hole section 1211 to lock the stator core 300 to the first lug 120. The flow gap 520 is formed between the light hole section 1212, the light hole, and the bolt 520.

[0076] As will be appreciated, when all first connection holes 121 are configured as threaded holes, the thread gap between the bolt 510 and the first connection hole 121 is small, resulting in a small flow of coolant, which is detrimental to cooling the stator core 300. To this end, the first connection hole 121 is configured to include a coaxially connected threaded hole section 1211 and a light hole section 1212. The diameter of the light hole section 1212 is radially larger than that of the threaded hole section 1211, and the liquid inlet hole 111 is radially connected to the light hole section 1212. One axial end of the light hole section 1212 is connected to the threaded hole section 1211, and the other axial end is connected to the second connection hole 330. As will be appreciated, the gap between the light hole section 1212 and the bolt 510 is larger than the gap between the threaded hole section 1211 and the bolt 510, thereby increasing the flow of coolant.

[0077] In the embodiment shown in the drawings, the liquid inlet 111 is located at the first lug 120 of the housing 100, connecting the liquid inlet 111 to the light hole section 1212. Furthermore, the light hole section 1212 is connected to the second connecting hole 330, which in turn is connected to the first liquid flow channel 3102. This creates a flow path for the coolant entering the stator core 300: liquid inlet 111 - light hole section 1212 - second connecting hole 330 - first liquid flow channel 3102. This also simplifies the overall structure of the stator core 300, creating a simpler flow path.

[0078] As will be appreciated, the stator core 300 and the housing 100 are connected via bolts 510. In the axial direction, the first lug 120 abuts against one axial end of the first punching unit 310. To ensure the tightness of the connection between the first connecting hole 121 and the second connecting hole 330, that is, to ensure the tightness of the connection between the light hole segment 1212 and the second connecting hole 330, a sealant, a sealing gasket, etc. may be provided between the first lug 120 and the first punching unit 310. This reduces the possibility of coolant leakage from between the first connecting hole 121 and the second connecting hole 330.

[0079] See also Figure 3 In an embodiment of the present invention, at least the second punching plate group 312 close to the liquid inlet hole 111 is further provided with a guide notch 3121 , and the guide notch 3121 communicates with the second connecting hole 330 and the first liquid passage trough 3102 .

[0080] As will be appreciated, the second connecting hole 330 is radially disposed outside the first liquid transfer trough 3102 and needs to be connected to the first liquid transfer trough 3102 via a diversion channel. In one embodiment, the diversion channel is configured as a diversion notch 3121 that extends radially, thereby connecting the second connecting hole 330 and the first liquid transfer trough 3102. This allows coolant to flow from the flow gap 520 of the second connecting hole 330 through the diversion notch 3121 into the first liquid transfer trough 3102.

[0081] It can be understood that the function of the guide notch 3121 is to guide the coolant from the second connecting hole 330 into the first liquid trough 3102, thereby achieving cooling of the stator core 300. In this way, a guide notch 3121 is provided on the second punching plate group 312 at least at a position close to the liquid inlet hole 111. That is, when there is only one liquid inlet channel 110, one or more guide notches 3121 can be provided. Among them, the guide notch 3121 close to the liquid inlet hole 111 is used to guide the coolant from the second connecting hole 330 to the first liquid trough 3102; the guide notches 3121 at other positions can guide the coolant in the first liquid trough 3102 to the second connecting hole 330. Considering the cooling effect on the stator core 300, only one guide notch 3121 is provided and is provided close to the liquid inlet hole 111. The following description is based on the example of one guide notch 3121.

[0082] In the scheme shown in the figure of the present invention, the guide gap 3121 is set as a straight flow channel. In other embodiments, the guide gap 3121 can also be set as a multi-segment line, a wave shape, etc., and the specific structure of the guide gap 3121 is not limited here.

[0083] See also Figure 5 In an embodiment of the present invention, the first liquid flow groove 3102 extends in the circumferential direction, and the guide notch 3121 is connected to the middle portion of the first liquid flow groove 3102. After the coolant enters the first liquid flow groove 3102 from the liquid inlet hole 111 through the guide notch 3121, it can flow in the circumferential direction to the circumferential ends of the first liquid flow groove 3102, and then flow in the axial direction to the two second liquid flow grooves 3202 respectively.

[0084] As can be understood, the first liquid transfer groove 3102 extends circumferentially to have a certain circumferential width, so that the circumferential ends of the first liquid transfer groove 3102 can respectively connect with the two adjacent second liquid transfer grooves 3202, thereby forming an "S"-shaped cooling path on the stator core 300. The guide gap 3121 is connected to the middle portion of a first liquid transfer groove 3102. In this way, the coolant flows radially from the liquid inlet 111 into the stator core 300, then axially enters the light hole section 1212 and the second connecting hole 330, and then radially flows into the guide gap 3121. Inside the guide gap 3121, the coolant flows radially into the first liquid transfer groove 3102. The coolant flowing into the first liquid transfer groove 3102 is divided into two flows: one flowing clockwise along the circumference of the first liquid transfer groove 3102, and the other flowing counterclockwise along the circumference of the first liquid transfer groove 3102. After the coolant flows to the two circumferential ends of the first liquid passage groove 3102 , it flows to the two second liquid passage grooves 3202 respectively.

[0085] In this way, after the coolant enters the first liquid flow groove 3102 from the liquid inlet hole 111 through the guide notch 3121, it can flow toward both ends in the circumferential direction, and flow axially to the two second liquid flow grooves 3202 respectively, so that the coolant flows along two "S"-shaped flow branches in the circumferential direction of the stator core 300. Each "S"-shaped flow branch extends 180° along the circumference of the stator core 300, so that the unit volume of coolant only needs to flow 180° in the circumferential direction of the stator core 300. Compared with the solution of forming only one "S"-shaped flow path in the circumferential direction of the stator core 300, this avoids the temperature of the unit volume of coolant being too high due to the long flow distance, thereby avoiding poor cooling effect and uneven cooling effect; at the same time, it is beneficial to improve cooling efficiency and ensure cooling effect and cooling uniformity. In addition, the liquid inlet ends of the two “S”-shaped flow branches are both supplied with cooling liquid by the first liquid passage trough 3102 connected to the guide gap 3121, which is conducive to the simplicity of the overall flow path structure.

[0086] See also Figure 1 、 Figure 9 and Figure 10 In an embodiment of the present invention, the motor further includes oil rings 600 provided at both ends of the stator core 300. The oil rings 600 abut against the first punching sheet group 311. The oil ring 600 is provided with an input hole 610 and a plurality of output holes 620 that are connected to each other. The first punching sheet group 311 is provided with at least one first liquid outlet hole 3111 that is connected to the first liquid flow groove 3102. The input hole 610 is connected to the first liquid outlet hole 3111. The plurality of output holes 620 are arranged at intervals along the circumference of the oil ring 600. The output holes 620 are used to guide the coolant to the stator winding 400.

[0087] It will be appreciated that the portion of the stator winding 400 embedded in the slots of the stator core 300 can be cooled by the coolant in the first and second flow channels 3101 and 3201. The stator winding 400 also has portions exposed at both axial ends of the stator core 300. To cool these portions, oil rings 600 are provided at both ends of the stator core 300, abutting the first punching assembly 311. The oil rings 600 are filled with coolant and are used to spray the coolant onto the portions of the stator winding 400 exposed at both axial ends of the stator core 300, thereby cooling the stator winding 400.

[0088] See also Figure 1 In one embodiment, a second lug 130 is provided on the inner wall of the housing 100. The second lug 130 and the first lug 120 are located at the same axial end of the housing 100. A first fixing hole 131 is defined in the second lug 130. The oil ring 600 is provided with a fixing protrusion 640 at a position away from the axis, and a second fixing hole 630 is defined in the fixing protrusion 640. For ease of explanation, the first end of the stator core 300 is defined as being connected to the first lug 120. Correspondingly, the second fixing hole 630 of the oil ring 600 at the first end is aligned with the first fixing hole 131 of the second lug 130. A connecting member passes through the first fixing hole 131 and the second fixing hole 630, thereby securing the oil ring 600. The second fixing hole 630 of the second end oil ring 600 is aligned with the second connection hole 330 of the stator core 300. The bolt 510 passes through the first connection hole 121 and the second connection hole 330, and also passes through the second fixing hole 630, thereby fixing the second end oil ring 600 to the stator core 300. In this way, the oil ring 600 is installed and fixed.

[0089] As will be appreciated, after the coolant flows out of the stator core 300, it can flow into the oil ring 600, cooling the windings through the oil ring 600, thereby simultaneously cooling the stator core 300 and the windings. In one embodiment, the oil ring 600 is provided with a connected input hole 610 and multiple output holes 620. The input hole 610 is connected to the first liquid outlet hole 3111, thereby introducing the coolant into the oil ring 600. The multiple output holes 620 are spaced apart along the circumference of the oil ring 600 to spray the stator windings 400 from multiple locations, thereby improving the cooling effect and cooling uniformity of the stator windings 400.

[0090] In one embodiment, the oil ring 600 is a one-piece structure having an internal oil ring channel connecting the input hole 610 and the plurality of output holes 620. This facilitates the sealing of the oil ring 600 and reduces the possibility of coolant leakage. It will be appreciated that to prevent coolant leakage from the connection between the oil ring 600 and the stator core 300, a sealant, a gasket, or the like may be provided between the oil ring 600 and the first punching assembly 311.

[0091] As will be appreciated, two oil rings 600 are provided, one at each axial end of the stator core 300. The inlet hole 610 of the oil ring 600 is connected to the first liquid outlet hole 3111 of the stator core 300. In other words, liquid outlet channels are provided at both axial ends of the stator core 300, i.e., both first punching sheet groups 311 at the axial ends of the stator core 300 are provided with first liquid outlet holes 3111 for guiding the coolant out.

[0092] See also Figure 9 and Figure 10 In an embodiment of the present invention, the output hole 620 is provided on the end surface of the oil ring 600 away from the stator core 300 , and the output hole 620 is inclined toward the center of the oil ring 600 .

[0093] As will be appreciated, in the embodiment shown in the drawings of the present invention, the output hole 620 is provided on the end face of the oil ring 600 axially facing away from the stator core 300. This allows the cooling oil to be sprayed further in the axial direction, compared to a configuration where the output hole 620 is provided on the end face of the oil ring 600 facing the axis, thereby reducing the axial thickness of the oil ring 600 and facilitating cost reduction. Furthermore, to ensure that the coolant is sprayed onto the stator winding 400 as closely as possible, the output hole 620 is tilted toward the center of the oil ring 600. The tilt angle of the output hole 620 is not limited herein.

[0094] The present invention also proposes a vehicle, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiments. Since this vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0095] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: shell; and A stator is fixed in the housing, the stator comprising a stator core and a stator winding, the stator core comprising two first punching units respectively provided at two axial ends and a second punching unit provided between the two first punching units, the first punching units being provided with a plurality of first flow channels spaced apart in the circumferential direction, and the plurality of first flow channels of each of the two first punching units being staggered in the circumferential direction of the stator core, the second punching unit being provided with a plurality of second flow channels spaced apart in the circumferential direction, and the second flow channels passing through the two axial ends of the second punching unit; For the multiple first flow channels, multiple second flow channels of a first punching sheet unit and the multiple first flow channels of another first punching sheet unit, the first flow channels of a first punching sheet unit, the second flow channels, the first flow channels of another first punching sheet unit and the second flow channels are connected in an alternating and reciprocating manner to form a coolant flow path extending in a continuous tortuous manner in the circumferential direction of the stator core.

2. The motor according to claim 1, wherein The first punching unit includes a first punching group and a second punching group stacked together, the second punching group is located on a side of the first punching group close to the second punching unit, the first flow channel is configured as a first liquid flow groove provided in the second punching group and axially passing through the second punching group, the first punching group blocks one axial end of the first liquid flow groove; the second flow channel is configured as a second liquid flow groove provided in the second punching unit and axially passing through the second punching unit.

3. The motor according to claim 2, characterized in that The shell is provided with a liquid inlet channel, the stator core is connected to the shell via a bolt locking structure, the bolt locking structure has a flow gap, and the liquid inlet channel is connected to the first liquid flow trough or the second liquid flow trough via the flow gap.

4. The motor according to claim 3, wherein The inner wall of the housing is provided with a first lug, and the bolt locking structure includes a first connecting hole provided on the first lug, a second connecting hole provided on the stator core and extending axially therethrough, and a bolt, wherein the bolt has the flow-through gap between the first connecting hole and the second connecting hole; The liquid inlet channel includes a liquid inlet hole provided on the housing, the liquid inlet hole is communicated with the first connecting hole, and the second connecting hole is communicated with the first liquid passage trough or the second liquid passage trough.

5. The motor according to claim 4, characterized in that The first connecting hole includes a coaxially connected threaded hole section and a light hole section, the diameter of the light hole section is larger than the diameter of the threaded hole section, the liquid inlet hole is connected to the light hole section, and the second connecting hole is configured as a light hole. The bolt passes through the second connecting hole and the light hole section in sequence and is screwed into the threaded hole section to lock the stator core to the first lug, and the flow gap is formed between the light hole section, the light hole and the bolt.

6. The motor according to claim 4, characterized in that A guide notch is provided on at least the second punching plate group close to the liquid inlet hole, and the guide notch is connected to the second connecting hole and the first liquid flow groove.

7. The motor according to claim 6, characterized in that The first liquid flow groove extends in the circumferential direction, and the guide notch is connected to the middle part of the first liquid flow groove. After the coolant enters the first liquid flow groove from the liquid inlet hole through the guide notch, it can flow in the circumferential direction to the circumferential ends of the first liquid flow groove, and then flow in the axial direction to the two second liquid flow grooves respectively.

8. The motor according to claim 2, wherein: The motor also includes oil rings provided at both ends of the stator core, the oil rings abutting against the first punching sheet group, the oil rings being provided with a connected input hole and a plurality of output holes, the first punching sheet group being provided with at least one first liquid outlet hole connected to the first liquid flow groove, the input hole being connected to the first liquid outlet hole, and the plurality of output holes being arranged at intervals along the circumference of the oil ring, the output holes being used to lead the coolant to the stator winding.

9. The motor according to claim 8, characterized in that The output hole is provided on an end surface of the oil ring which is away from the stator core, and the output hole is inclined toward the center of the oil ring.

10. A vehicle, characterized in that: The motor comprises the motor according to any one of claims 1 to 9.

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