Stator assembly, motor, driving assembly and vehicle

Abstract

The utility model provides a stator assembly, a motor, a driving assembly and a vehicle, the stator assembly comprises a stator iron core and a first oil spraying member arranged at the first end of the stator iron core, the stator iron core comprises a hollow yoke part, a tooth part arranged on the inner wall of the yoke part and a fixed part arranged on the outer wall of the yoke part, the stator assembly is further provided with a liquid cooling flow channel capable of being connected into an external cooling liquid supply assembly, the liquid cooling flow channel at least comprises a first cooling flow channel formed in the fixing part and an oil spraying flow channel formed in the first oil spraying piece, the first cooling flow channel communicates with the oil spraying flow channel, and the first oil spraying piece is provided with first spraying holes communicating with the oil spraying flow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator component, a motor, a drive assembly and a vehicle. Background Art

[0002] When a motor is running, the coil windings generate heat and transfer it to the stator core. Therefore, it is necessary to dissipate heat and cool the coil windings and stator core. Using coolant to cool the stator core and coil windings is a commonly used heat dissipation and cooling solution. As motor designs become increasingly compact and miniaturized, it becomes increasingly difficult to provide liquid cooling channels in the stator core to allow coolant to flow and absorb heat. For example, the stator core's volume and shape must simultaneously accommodate the space requirements of the yoke, teeth, and liquid cooling channels. This can potentially encroach on the space available for the teeth, coil windings, and even the rotor assembly. Furthermore, the liquid cooling channels complicate the motor structure, reducing assembly convenience and performance reliability. Utility Model Content

[0003] In view of this, the present invention provides a stator assembly and a motor with a simple and compact structure and easy to dissipate heat and cool down with a coolant, and also provides a drive assembly and a vehicle including the motor.

[0004] The stator assembly of the present invention includes a stator core and a first oil sprinkling piece provided at the first end of the stator core. The stator core includes a hollow yoke, a tooth portion provided on the inner wall of the yoke, and a fixed portion provided on the outer wall of the yoke. The stator assembly is also constructed with a liquid cooling channel that can be connected to an external coolant supply component. The liquid cooling channel includes at least a first cooling channel opened in the fixed portion and an oil sprinkling channel opened in the first oil sprinkling piece. The first cooling channel is connected to the oil sprinkling channel, and the first oil sprinkling piece is provided with a first spray hole connected to the oil sprinkling channel.

[0005] In some embodiments, the liquid cooling channel further includes a second cooling channel opened in the yoke and connected to the oil spray channel.

[0006] In some embodiments, the stator assembly is provided with an entrance connected to a first cooling channel, the first cooling channel passes through the first end of the stator core and forms a first connecting port, and the two ends of the second cooling channel respectively pass through the first end and the second end of the stator core and form a second connecting port and an outlet respectively, and the first connecting port and the second connecting port are connected to the oil spray channel.

[0007] In some embodiments, the first oil sprinkling part has a connecting portion, the end of the connecting portion and the end of the fixed portion are arranged relative to each other, and the liquid cooling flow channel also includes a cache flow channel located outside the connecting portion, and the cache flow channel connects the first connecting port and the oil sprinkling flow channel.

[0008] In some embodiments, the first oil spraying member is provided with a first spray hole connected to the oil spraying channel, and the first spray hole is used to spray coolant onto the portion of the stator coil winding protruding from the first end, wherein:

[0009] In the axial orientation of the yoke, the first spray hole is not lower than the tooth portion; and / or,

[0010] The first oil spraying member extends in a ring shape along the circumference of the yoke, and the first spraying holes are configured in plurality and arranged along the circumference of the yoke.

[0011] In some embodiments, the second cooling channels are configured in plurality and are arranged in a circumferential direction of the yoke, and the oil dripping channel extends along the circumference of the yoke and connects with each of the second cooling channels.

[0012] In some embodiments, the inlet and the outlet are both located at the second end of the stator core.

[0013] In some embodiments, the stator assembly further includes a second oil sprinkling member disposed at the second end of the stator core, the liquid cooling channel further includes an oil spray channel opened in the second oil sprinkling member, the outlet is connected to the oil spray channel, the second oil sprinkling member is provided with a second spray hole connected to the oil spray channel, and the second spray hole is used to spray cooling liquid onto the portion of the stator coil winding protruding from the second end.

[0014] In some embodiments, the total opening area of the second spray holes is smaller than the total opening area of the outlets.

[0015] In some embodiments, inner walls of the first cooling channels are all formed by the stator core and are circumferentially closed; and / or inner walls of the second cooling channels are all formed by the stator core and are circumferentially closed.

[0016] In some embodiments, there are multiple fixing parts, each of which is provided with a first cooling channel; and / or,

[0017] The fixing portion extends along the axial direction of the yoke to form a rib-shaped structure. The first cooling channel is a straight channel and extends along the axial direction of the yoke.

[0018] The motor provided by the utility model includes the above-mentioned stator assembly.

[0019] The drive assembly provided by the present invention includes a drive motor and a mounting seat. The drive motor includes the above-mentioned stator assembly. One end of the stator core is used as a mounting end for mounting the mounting seat, wherein:

[0020] The mounting seat is provided with an injection hole for receiving an external coolant supply assembly, and the first cooling channel is connected to the injection hole; and / or,

[0021] The liquid cooling channel also includes a second cooling channel opened in the yoke. The mounting end is provided with an outlet connected to the second cooling channel. Part of the mounting seat covers the half side of the outlet that is relatively far away from the axis of the yoke.

[0022] The vehicle provided by the utility model includes the above-mentioned motor.

[0023] Compared with the prior art, the beneficial effects of the present invention include:

[0024] 1) At least a portion of the liquid cooling channels, including the first cooling channel, is provided in the fixed portion, reducing the difficulty and cost of providing the liquid cooling channels on the stator core. Therefore, for a motor equipped with the stator assembly of the present invention, the coil winding exchanges heat with the stator assembly through the teeth. The heat is then transferred from the teeth to the fixed portion through the yoke. Heat is then exchanged between the coolant in the first cooling channel and the fixed portion, thereby achieving heat dissipation and cooling of the stator core and coil winding.

[0025] 2) The fixed portion of the stator core is efficiently utilized. The fixed portion is not only used to connect the stator assembly and the external connection structure, but also serves as a forming structure for at least part of the liquid cooling channel. The first cooling channel provided in the fixed portion does not encroach on the space of the yoke and teeth, nor does it occupy the space for arranging the rotor assembly. Therefore, the stator assembly is suitable for installation in a compact and small motor product.

[0026] 3) The first cooling channel not only serves as a flow channel for the coolant, but also is equivalent to a material reduction cavity for material reduction processing of the stator core. The material reduction cavity corresponds to the radial direction of the fixed part in each radial direction of the yoke, thereby offsetting the dimensional thickness gain of the stator core in the radial direction of the fixed part, which helps to improve the uniformity of the magnetic flux inside the stator core, that is, in each radial direction of the yoke, the magnetic circuit inside the stator core is more balanced and the uniformity of the magnetic flux flow is improved, thereby reducing the torque fluctuation amplitude during motor operation, which helps to improve the stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a motor according to one embodiment of the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of a stator assembly according to one embodiment of the present utility model;

[0029] Figure 3 This is a cross-sectional view of a motor according to one embodiment of the present invention;

[0030] Figure 4 This is a partial structural schematic diagram of a stator assembly according to one embodiment of the present utility model;

[0031] Figure 5This is a partial structural schematic diagram of a stator assembly according to another embodiment of the present invention.

[0032] Explanation of the reference numerals: 10, stator core; 11, yoke; 111, second cooling channel; 1111, outlet; 1112, second connecting port; 12, tooth portion; 13, fixing portion; 131, first cooling channel; 1311, inlet; 1312, first connecting port; 132, first fixing hole; 20, first oil spraying part; 21, oil spraying part; 22, connecting portion; 221, second fixing hole; 23, oil spraying channel; 232, buffer channel; 24, first spray hole; 30, coil winding; 31, winding welding end; 32, winding crown end; 50, fastener; 60, rotor assembly; 70, mounting seat; 71, injection hole; 80, second oil spraying part; 81, second spray hole; 82, inlet hole; 83, fastener outlet hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 creative efforts are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The utility model provides a stator component and a motor, and also provides a drive assembly including the motor and a vehicle. The motor can be used as a power source for a vehicle driving system, and can also be used as a power source for other movable components or systems on the vehicle.

[0036] See Figures 1 and 2The stator assembly includes a stator core 10, which includes a yoke 11 with a hollow cylindrical structure and a plurality of teeth 12 provided on the inner wall of the yoke 11. Each tooth 12 is a convex rib protruding from the inner wall of the yoke 11, and the opposite ends of the convex rib are arranged along the axial direction of the yoke 11 and form the two ends of the tooth 12; the motor includes a stator assembly, a stator coil winding 30 and a rotor assembly 60. The stator coil winding 30 is embedded in the tooth slots between the teeth 12 and is fixedly connected to the stator core 10. The rotor assembly 60 is rotatably provided in the hollow channel of the yoke 11 and is coaxially arranged with the stator core 10, that is, the axis of the rotor assembly 60 coincides with the axis of the yoke 11.

[0037] Further, see Figure 3 The stator core 10 includes a first end and a second end. The first end and the second end of the stator core 10 are arranged along the axial direction of the yoke 11 and are away from each other. One end of the stator coil winding 30 protrudes from the first end of the stator core 10 in the axial direction of the yoke 11 to form a winding crown end 32. The other end of the stator coil winding 30 protrudes from the second end of the stator core 10 in the axial direction of the yoke 11 to form a winding welding end 31. The winding welding end 31 is used to realize the electrical connection between the stator coil winding 30 and an external energized device, so that current can pass through the stator coil winding 30, so that the stator coil winding 30 cuts the magnetic flux lines of the stator core 10 and excites an induced magnetic field.

[0038] Further, see Figures 1 and 2 The stator core 10 further includes a fixing portion 13 provided on the outer peripheral wall of the yoke 11. The fixing portion 13 is used to achieve a fixed connection between the stator assembly and the external connection structure. The fixing portion 13 can be a lug for fixedly connecting to the external connection structure via a fastener 50. When the fixing portion 13 is a lug, the fixing portion 13 is a rib-like structure extending along the axial direction of the yoke 11 and protruding from the outer peripheral wall of the yoke 11. The fixing portion 13 is provided with a first fixing hole 132 extending along the axial direction of the yoke 11. The first fixing hole 132 allows a fastener 50 such as a bolt or stud to pass through, thereby fixing the fixing portion 13 to the external connection structure via the fastener 50.

[0039] Optionally, there are multiple fixing parts 13, and the multiple fixing parts 13 are arranged along the circumference of the yoke 11. Preferably, the multiple fixing parts 13 are evenly arranged at equal intervals along the circumference of the yoke 11. With this arrangement, the installation stability of the stator assembly is stronger, and the force on the stator assembly is more balanced when the motor is running.

[0040] To dissipate heat and cool the stator core 10 and stator coil windings 30, the stator assembly of the present invention is also constructed with a liquid cooling channel that can be connected to an external coolant supply assembly. The liquid cooling channel serves as a cavity for the flow of coolant. When the motor is running, the heat generated by the stator coil windings 30 is transferred to the stator core 10 through the teeth 12. The coolant in the liquid cooling channel then exchanges heat with the stator core 10, thereby absorbing and removing the heat from the stator core 10. Figures 2 and 3 The liquid cooling channel includes at least a first cooling channel 131 provided in the fixed portion 13. Furthermore, the liquid cooling channel also includes an oil spray channel 23 located at the end of the stator core 10 and a second cooling channel 111 provided in the yoke 11. The oil spray channel 23 sprays coolant toward the winding crown end 32 or the winding welding end 31. The second cooling channel 111 is closer to the teeth 12 and the stator coil winding 30, allowing for efficient and rapid cooling of the stator coil winding 30.

[0041] It should be noted that, in other embodiments, the second cooling channel 111 may not be provided. On the basis of providing the first cooling channel 131, the stator assembly further includes a first oil spraying member 20 provided at the first end of the stator core 10 and / or a second oil spraying member 80 provided at the second end of the stator core 10. The liquid-cooling channel further includes a first spray hole 24 located at the first end and formed in the first oil spraying member 20; and / or, the liquid-cooling channel further includes a second spray hole located at the second end and formed in the second oil spraying member 80. The first spray hole 24 and the second spray hole are connected to the first cooling channel 131. The first spray hole 24 is used to spray coolant onto the winding crown end 32 to reduce the temperature of the stator coil winding 30, and the second spray hole is used to spray coolant onto the winding welding end 31 to reduce the temperature of the stator coil winding 30.

[0042] Based on the first cooling channel 131 provided in the fixed portion 13, the heat conducted from the stator coil winding 30 to the stator core 10 accumulates in the fixed portion 13, and then heat exchange occurs between the coolant in the first cooling channel 131 and the fixed portion 13, thereby absorbing and carrying away the heat accumulated in the fixed portion 13. This improves the heat dissipation capacity of the outside of the stator core 10. The heat dissipation capacity of the outside of the stator core 10 is the heat dissipation capacity of the outer peripheral wall of the yoke 11 and the surface of the fixed portion 13; it also reduces the difficulty and cost of providing a liquid cooling channel on the stator core 10, and efficiently utilizes the fixed portion 13, so that the fixed portion 13 is not only used to connect the stator assembly and the external connection structure, but also serves as the structure where at least a part of the liquid cooling channel is located. The first cooling channel 131 does not encroach on the molding space for the yoke 11 and the tooth portion 12, nor does it encroach on the space for arranging the rotor assembly 60 and the stator coil winding 30. Therefore, the stator assembly of the present invention is suitable for being mounted in motor products with a more compact structure and smaller size.

[0043] The significance of the first cooling channel 131 lies not only in providing a cavity for the flow of coolant, but more importantly, in that the provision of the first cooling channel 131 enables improved material reduction of the stator core 10. The first cooling channel 131 is equivalent to a material reduction cavity obtained after material reduction of the stator core 10. This material reduction cavity corresponds to the radial direction of the fixing portion 13 in each radial direction of the yoke 11, thereby offsetting the dimensional thickness gain of the stator core 10 in the radial direction of the fixing portion 13. The dimensional thickness gain specifically refers to the dimensional thickness gain brought by the fixing portion 13 on the basis of the wall thickness of the yoke 11. Therefore, the first cooling channel 131 helps to improve the uniformity of the magnetic flux inside the stator core 10, that is, in each radial direction of the yoke 11, the magnetic circuit inside the stator core 10 is more balanced and the uniformity of the magnetic flux flow is improved, thereby improving the amplitude of the torque fluctuation generated by the motor during operation, which is beneficial to improving the operating stability of the motor.

[0044] In some embodiments, the first cooling channel 131 and the second cooling channel 111 are fluidly connected, and the coolant can flow through the first cooling channel 131 and the second cooling channel 111 successively, or flow through the second cooling channel 111 and the first cooling channel 131 successively.

[0045] See Figure 1 and Figure 3 The first end of the stator core 10 is provided with a first communication port 1312 and a second communication port 1112, and the second end of the stator core 10 is provided with an inlet 1311 and an outlet 1111. The inlet 1311 and the first communication port 1312 serve as the two end openings of the first cooling channel 131, respectively. The second communication port 1112 and the outlet 1111 serve as the two end openings of the second cooling channel 111, respectively. The stator assembly further includes a first oil spraying member 20 mounted on the first end. The liquid cooling channel further includes an oil spraying channel 23 provided on the first oil spraying member 20. The oil spraying channel 23 connects the first communication port 1312 and the second communication port 1112, thereby achieving communication between the first cooling channel 131 and the second cooling channel 111. The first spray hole 24 is provided on the first oil spraying member 20 and connects to the oil spraying channel 23.

[0046] exist Figure 1 and Figure 3 In the motor shown, first, the external coolant supply assembly provides coolant to the first cooling channel 131 from the inlet 1311, then the coolant flows into the oil spray channel 23 from the first connecting port 1312, then the coolant flows out of the oil spray channel 23 from the second connecting port 1112 and flows into the second cooling channel 111, and finally the coolant flows out of the second cooling channel 111 from the outlet 1111.

[0047] In other embodiments, the external coolant supply assembly can also provide coolant to the second cooling channel 111 from the outlet 1111, and then the coolant flows into the oil spray channel 23 from the second connecting port 1112, and then the coolant flows out of the oil spray channel 23 and flows into the first cooling channel 131 from the first connecting port 1312, and finally the coolant flows out of the first cooling channel 131 from the inlet 1311.

[0048] Specifically, see Figure 2 and Figure 3 When the fixing portion 13 is a rib-shaped lug extending axially along the yoke 11, the two ends of the rib-shaped structure are the two ends of the fixing portion 13. The first end of the stator core 10 includes the first end of the yoke 11 and the first end of the fixing portion 13. The second end of the stator core 10 includes the second end of the yoke 11 and the second end of the fixing portion 13. The first communicating port 1312 is opened at the first end of the fixing portion 13, and the inlet 1311 is opened at the second end of the fixing portion 13; the second communicating port 1112 is opened at the first end of the yoke 11, and the outlet 1111 is opened at the second end of the yoke 11.

[0049] Alternatively, as Figure 2 In the illustrated stator core 10, each first cooling channel 131 extends through both ends of the fixed portion 13 to form an inlet 1311 and a first communication opening 1312. Each second cooling channel 111 extends through both ends of the yoke 11 to form an outlet 1111 and a second communication opening 1112. There can be multiple first cooling channels 131 and multiple second cooling channels 111.

[0050] Optionally, the number of the second cooling channels 111 is multiple times greater than the number of the first cooling channels 131, and the plurality of second cooling channels 111 are arranged circumferentially around the yoke 11. More second cooling channels 111 are intended to better meet the need for heat dissipation and cooling of the yoke 11 / tooth 12 / stator coil winding 30. The greater the number of second cooling channels 111, the more heat the coolant absorbs from the yoke 11 / tooth 12 / stator coil winding 30, and the greater the resulting cooling amplitude. Therefore, it is necessary to evacuate the coolant from the first cooling channel 131 to the plurality of second cooling channels 111 through the oil spray channel 23. For this, please refer to Figure 1 、 Figures 3 and 4 The first oil-sprinkling member 20 includes an arc-shaped or closed ring-shaped oil-sprinkling portion 21, which is arranged opposite to the first end of the yoke 11. The oil-sprinkling channel 23 is an arc-shaped channel formed in the oil-sprinkling portion 21. The oil-sprinkling channel 23 extends in an arc shape along the circumference of the yoke 11 and connects all the second connecting ports 1112.

[0051] It should be noted that, in some other embodiments, the inlet 1311 can also be opened at other positions of the stator assembly and is not limited to being opened at the first end of the stator core 10. Taking the motor used in new energy vehicles as an example, when the motor is used in a hybrid vehicle, the opening position of the inlet 1311 can be as follows: Figure 3 The embodiment shown is located at the first end of the stator core 10, i.e., both the inlet 1311 and the outlet 1111 are located at the first end of the stator core 10. When the motor is used in a pure electric vehicle, the inlet 1311 can be located on the outer peripheral wall of the yoke 11. Of course, the aforementioned locations for the inlet 1311 are not absolute and can be flexibly selected or adaptively adjusted based on the vehicle platform, drive assembly layout, and architecture, and will not be elaborated on here.

[0052] Further, see Figure 3 and Figure 4 The first oil-sprinkling member 20 further includes a connecting portion 22, which is connected to the oil-sprinkling member 21 and is disposed at the first end of the fixed portion 13. The liquid-cooling channel also includes a buffer channel 232 formed in the first oil-sprinkling member 20 and extending from the outside of the connecting portion 22. The buffer channel 232 is located at the first end of the fixed portion 13 and directly connects to the first connecting port 1312. Specifically, the number of fixed portions 13 is equivalent to the number of connecting portions 22, and the first ends of the fixed portions 13 and the connecting portions 22 are disposed in a one-to-one correspondence. A buffer channel 232 connecting to the oil-sprinkling channel 23 is formed on the outside of each connecting portion 22. The buffer channel 232 formed on the outside of each connecting portion 22 is specifically used to collect the coolant flowing out of the first connecting port 1312 corresponding to the connecting portion 22. The first connecting port 1312 corresponding to the connecting portion 22 refers to the first connecting port 1312 opened on the fixed portion 13 corresponding to the connecting portion 22.

[0053] With such an arrangement, when the coolant enters the second cooling channel 111 from the first cooling channel 131 through the oil sprinkling channel 23, the coolant flows sequentially through the first connecting port 1312, the buffer channel 232, the oil sprinkling channel 23, and the second connecting port 1112; when the coolant enters the first cooling channel 131 from the second cooling channel 111 through the oil sprinkling channel 23, the coolant flows sequentially through the second connecting port 1112, the oil sprinkling channel 23, the buffer channel 232, and the first connecting port 1312.

[0054] like Figure 3 and Figure 4As shown, the connecting portion 22 is provided with a second fixing hole 221, and the inner wall of the second fixing hole 221 is axially closed, so that the second fixing hole 221 and the buffer flow channel 232 are not connected to each other, and the coolant will not leak into the second fixing hole 221. In any fixing portion 13 and the connecting portion 22 corresponding to the fixing portion 13, the first fixing hole 132 and the second fixing hole 221 are directly connected, so that the fastener 50 can pass through the first fixing hole 132 and the second fixing hole 221 at the same time, thereby fixing the stator core 10 and the first oil spraying member 20 together. The fastener 50 can be Figure 3 Preferably, the fastener 50 may also extend from the second end of the fixing portion 13 , that is, the fastener 50 protrudes from the second end of the stator core 10 , thereby enabling the fastener 50 to be fixedly connected to the external connection structure at the second end of the stator core 10 .

[0055] It can be understood that the first oil spraying member 20 can also be fixedly connected to the first end of the stator core 10 by bonding, welding, etc. The first oil spraying member 20 with the oil spraying channel 23 is provided to simplify the structure of the stator assembly and facilitate the connection of the first cooling channel 131 to the second cooling channel 111. In other embodiments, the first oil spraying member 20 can also be integrally formed with the stator core 10.

[0056] Further, see Figure 1 and Figure 3 In the axial direction of the yoke 11, the oil spraying portion 21 protrudes from the end of the tooth portion 12. In the axial direction of the yoke 11, the first spray hole 24 is not lower than the tooth portion 12, thereby spraying coolant onto the winding crown end 32 to cool the stator coil winding. Therefore, the coolant entering the oil spraying channel 23 from the first cooling channel 131 is divided into two parts: one part flows out of the first spray hole 24 to cool the stator coil winding 30, and the other part flows into the second cooling channel 111 to cool the stator core 10.

[0057] Alternatively, as Figure 1 and Figure 4 As shown, the oil-sprinkling portion 21 is an arc-shaped structure extending along the circumference of the yoke 11, and the oil-sprinkling channel 23 is a closed loop extending along the circumference of the yoke 11. The first oil-sprinkling member 20 is sleeved on the outer circumference of the winding crown end 32. Multiple first spray holes 24 are provided on the side of the oil-sprinkling portion 21 closest to the axis of the yoke 11. These first spray holes 24 are arranged along the circumference of the yoke 11, with their openings radially oriented toward the winding crown end 32. This arrangement ensures a uniform cooling effect on the winding crown end 32 along the circumference of the yoke 11.

[0058] Optionally, see Figure 2The inner wall of the first cooling channel 131 is formed by the fixed portion 13 of the stator core 10, and the inner wall of the first cooling channel 131 is circumferentially closed. The inner wall of the second cooling channel 111 is formed by the yoke 11 or the tooth portion 12 of the stator core 10, and the inner wall of the second cooling channel 111 is circumferentially closed. With this arrangement, the first cooling channel 131 and the second cooling channel 111 are obtained after the stator core 10 is formed. The stator core 10 does not need to be combined with an external structure to jointly define the first cooling channel 131 and the second cooling channel 111 with the external structure. The airtightness of the first cooling channel 131 and the second cooling channel 111 is ensured, preventing the first cooling channel 131 and the second cooling channel 111 from leaking coolant due to assembly errors between the stator core 10 and the external structure.

[0059] As a preference, Figure 2 and Figure 3 As shown, each fixed portion 13 has a first cooling channel 131 defined within it. Both the first cooling channel 131 and the second cooling channel 111 are linear channels, extending along the axis of the yoke 11. The first cooling channel 131 directly penetrates the first and second ends of the stator core 10, forming a first communication port 1312 and an inlet 1311, respectively. The second cooling channel 111 directly penetrates the first and second ends of the stator core 10, forming a second communication port 1112 and an outlet 1111, respectively. This arrangement simplifies the molding of the stator core 10. It is understood that in other embodiments, the first cooling channel 131 may be defined in only a portion of the fixed portion 13.

[0060] See Figure 3 The drive assembly of the present invention includes a drive motor and a mounting base 70. The drive motor is the motor provided by the present invention. The mounting base 70 is fixedly mounted to the second end of the stator core 10. When the drive assembly is applied to the driving system of an automobile, the mounting base 70 is fixedly connected to the automobile body. Specifically, a portion of the mounting base 70 is fixedly mounted to an end of the fixing portion 13 relatively away from the first oil spraying member 20. The fastener 50 extends from the end of the fixing portion 13 relatively away from the first oil spraying member 20 and extends into the mounting base 70. The mounting base 70 defines an injection hole 71 connected to the inlet 1311. The injection hole 71 can be connected to an external coolant supply assembly, thereby allowing coolant to be supplied from the external coolant supply assembly to the liquid cooling channel. When the motor needs to be disassembled and maintained, it is only necessary to remove the fastener 50 to remove the fixing portion 13 from the mounting base 70, and the entire motor can be removed from the vehicle without affecting the connection between the external coolant supply assembly and the mounting base 70. After the mounting base 70 and the fixing portion 13 are reconnected, the external coolant supply assembly can resume supplying coolant to the liquid cooling channel.

[0061] In some embodiments, see Figure 3The other part of the mounting seat 70 covers the half side of the outlet 1111 that is relatively far from the axis of the yoke 11, that is, the other part of the mounting seat 70 protrudes relative to the half side of the outlet 1111 that is far from the axis of the yoke 11 and forms a step. The half side of the outlet 1111 that is far from the axis of the yoke 11 refers to: in the opening edge of the outlet 1111, the half edge that is farther from the axis of the yoke 11. With this arrangement, the other half side of the outlet 1111 that is relatively close to the axis of the yoke 11 forms a second spray hole. The opening shape of the second spray hole is no longer a regular circle. The above-mentioned step can change the speed direction and trajectory of the coolant when it flows out of the outlet 1111. The coolant flowing out of the second spray hole obtains a velocity vector close to the axis of the yoke 11 under the influence of the step. Therefore, the coolant can be sprayed on the winding welding end 31, and finally the part of the stator coil winding 30 protruding from the second end is cooled.

[0062] See Figure 5 In some embodiments, the stator assembly further includes a second oil sprinkling member 80 provided at the second end of the stator core 10, the second oil sprinkling member 80 including an annular end plate, a first flange, and a second flange. The annular end plate has the same shape as the second end of the stator core 10, the first flange and the second flange are both protruding from the side of the annular end plate close to the second end of the stator core 10, the first flange extends along the outer peripheral edge of the annular end plate and matches the outer contour of the second end of the stator core 10, the second flange extends along the inner peripheral edge of the annular end plate and matches the inner contour of the second end of the stator core 10, the yoke 11 and the fixing portion 13 form the outer contour of the end portion of the stator core 10, and the tooth portion 12 and the tooth slots between the tooth portions 12 form the inner contour of the end portion of the stator core 10.

[0063] The liquid cooling channel also includes an oil spray channel defined within the second oil spray member 80. The outlet 1111 communicates with the oil spray channel. The second oil spray member 80 also has a second spray hole 81 connected to the oil spray channel. The second spray hole 81 is defined within the annular end plate and is used to spray coolant toward the welding end 31 of the stator coil winding 30. When the second oil spray member 80 is positioned at the second end of the stator core 10, the annular end plate of the second oil spray member 80 is spaced apart and disposed opposite the second end of the stator core 10. In this manner, the annular end plate, the second end of the stator core 10, the first flange, and the second flange collectively form the oil spray channel.

[0064] As mentioned above, the more the number of second cooling channels 111, the better the cooling and heat dissipation effect on the stator core 10. Correspondingly, the more the number of outlets 1111. However, if the number of outlets 1111 is too large, the total opening area of the outlets 1111 will be larger. Then, if the coolant is sprayed to the winding welding end 31 through the outlets 1111, the flow rate and pressure of the coolant will be insufficient, which will affect the heat dissipation effect on the winding welding end 31. In view of this, after the coolant flows out of the outlet 1111, it first enters the oil spray channel, and then sprays the coolant to the winding welding end 31 through the second spray hole 81, and the total opening area of the second spray hole 81 is smaller than the total opening area of the outlet 1111. Figure 3 and Figure 5 As shown, the number of the second spray holes 81 is less than the number of the outlets 1111. Compared with the flow rate and pressure of the coolant when it flows out of the outlet 1111, the flow rate and pressure of the coolant when it flows out of the second spray holes 81 are increased, which can expand the range of the coolant mist, thereby increasing the area of the winding welding end 31 covered by the coolant.

[0065] See again Figure 5 Optionally, the annular end plate of the second oil sprinkling member 80 is further provided with an inlet hole 82 and a fastener outlet hole 83. The inlet hole 82 and the inlet 1311 are directly connected, and the inlet hole 82 and the injection hole 71 are directly connected. The coolant provided by the external coolant supply assembly passes through the injection hole 71, the inlet hole 82 and the inlet 1311 in sequence and then enters the first cooling channel 131; the fastener outlet hole 83 and the first fixing hole 132 are directly connected, and the fastener passes through the first fixing hole 132 and the fastener outlet hole 83 in sequence and then connects to the mounting base 70.

[0066] In other embodiments, the annular end plate of the second oil-spraying member 80 has the same shape as the end face of the yoke 11 of the stator core 10. When the second oil-spraying member 80 is provided at the second end of the stator core 10, the second oil-spraying member 80 covers the end face of the yoke 11, but does not cover the end face of the fixing portion 13. At this time, the inlet hole 82 and the fastener outlet hole 83 can be eliminated, and the coolant provided by the external coolant supply assembly passes through the injection hole 71 and the inlet 1311 in sequence and enters the first cooling channel 131. The fastener passes through the first fixing hole 132 and directly extends into and connects to the mounting seat 70. In addition, the second oil-spraying member 80 can also be eliminated. After elimination, the outlet 1111 directly serves as the second spray hole to spray coolant to the winding welding end 31.

[0067] The various technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments fall within the scope of protection claimed by the present invention.

Claims

1. A stator assembly, characterized in that: The invention comprises a stator core (10) and a first oil sprinkling member (20) provided at a first end of the stator core (10), wherein the stator core (10) comprises a hollow yoke (11), a tooth portion (12) provided on an inner wall of the yoke (11), and a fixing portion (13) provided on an outer wall of the yoke (11), and the stator assembly is further configured with a liquid cooling channel capable of being connected to an external coolant supply assembly, wherein the liquid cooling channel at least comprises a first cooling channel (131) provided on the fixing portion (13) and an oil sprinkling channel (23) provided on the first oil sprinkling member (20), wherein the first cooling channel (131) is connected to the oil sprinkling channel (23), and the first oil sprinkling member (20) is provided with a first spray hole (24) connected to the oil sprinkling channel (23).

2. The stator assembly according to claim 1, wherein The liquid cooling channel also includes a second cooling channel (111) opened in the yoke (11) and connected to the oil spray channel (23).

3. The stator assembly according to claim 2, wherein: The stator assembly is provided with an inlet (1311) connected to the first cooling channel. The first cooling channel (131) passes through the first end of the stator core (10) and forms a first connecting port (1312). The two ends of the second cooling channel (111) respectively pass through the first end and the second end of the stator core (10) and form a second connecting port (1112) and an outlet (1111). The first connecting port (1312) and the second connecting port (1112) are connected to the oil spray channel (23).

4. The stator assembly according to claim 3, wherein: The first oil-spraying part (20) has a connecting portion (22) therein, and the connecting portion (22) and the end of the fixing portion (13) are arranged relative to each other. The liquid-cooling flow channel also includes a buffer flow channel (232) located outside the connecting portion (22), and the buffer flow channel (232) connects the first connecting port (1312) and the oil-spraying flow channel (23).

5. The stator assembly according to claim 3, wherein: The first oil spraying member (20) is provided with a first spray hole (24) connected to the oil spraying channel (23), and the first spray hole (24) is used to spray coolant to the portion of the stator coil winding (30) protruding from the first end, wherein: In the axial orientation of the yoke (11), the first spray hole (24) is not lower than the tooth portion (12); and / or, The first oil spraying member (20) extends in a ring shape along the circumference of the yoke (11), and the first spraying holes (24) are configured in plurality and arranged along the circumference of the yoke (11).

6. The stator assembly according to claim 3, wherein: The second cooling channels (111) are configured in a plurality and are arranged in a circumferential direction of the yoke (11); the oil spray channel (23) extends in a circumferential direction of the yoke (11) and is connected to each of the second cooling channels (111).

7. The stator assembly according to claim 3, wherein: The inlet (1311) and the outlet (1111) are both located at the second end of the stator core (10).

8. The stator assembly according to claim 7, wherein: The stator assembly further comprises a second oil sprinkling member (80) provided at the second end of the stator core (10); the liquid cooling channel further comprises an oil spray channel opened in the second oil sprinkling member (80); the outlet (1111) is connected to the oil spray channel; the second oil sprinkling member (80) is provided with a second spray hole (81) connected to the oil spray channel; the second spray hole (81) is used to spray cooling liquid onto a portion of the stator coil winding (30) protruding from the second end.

9. The stator assembly according to claim 8, wherein: The total opening area of the second spray holes (81) is smaller than the total opening area of the outlet (1111).

10. The stator assembly according to claim 2, wherein: The inner wall of the first cooling channel (131) is formed by the stator core (10) and is circumferentially closed; and / or the inner wall of the second cooling channel (111) is formed by the stator core (10) and is circumferentially closed.

11. The stator assembly according to claim 1, wherein: There are a plurality of fixing parts (13), and each fixing part (13) is provided with the first cooling channel (131); and / or, The fixing portion (13) extends along the axial direction of the yoke (11) to form a convex rib-shaped structure, and the first cooling channel (131) is a straight channel and extends along the axial direction of the yoke (11).

12. A motor, characterized in that: The invention comprises a stator assembly according to any one of claims 1 to 11.

13. A drive assembly, characterized in that: The invention comprises a driving motor and a mounting seat (70), wherein the driving motor comprises a stator assembly according to any one of claims 1 to 11, one end of the stator core (10) is used as a mounting end for mounting the mounting seat (70), wherein: The mounting seat (70) is provided with an injection hole (71) for receiving an external coolant supply assembly, and the first cooling channel (131) is connected to the injection hole (71); and / or, The liquid cooling channel also includes a second cooling channel (111) opened in the yoke (11) and / or the tooth portion (12), and the mounting end is provided with an outlet (1111) connected to the second cooling channel (111), and part of the mounting seat (70) covers the half side of the outlet (1111) relatively away from the axis of the yoke (11).

14. A vehicle, characterized in that: Comprising the motor as claimed in claim 12.

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