Stator structure, pouring sealing method of stator structure and motor

Abstract

The invention discloses a stator structure, a pouring sealing method of the stator structure and a motor, the stator structure comprises a plurality of stator cores, a stator shell, a partition plate and a plurality of rib plates, the plurality of stator cores are arranged in the stator shell and are distributed in the circumferential direction of the stator shell, and the stator shell comprises an outer shell and an inner shell; an outer side flow channel is defined between the stator winding and the outer shell, an inner side flow channel is defined between the stator winding and the inner shell, and the outer shell is provided with an oil inlet and an oil outlet which are communicated with the outer side flow channel; the partition plate is located between the oil inlet and the oil outlet. Each rib plate is arranged between two adjacent stator cores, at least part of each rib plate extends into the corresponding outer runner, and each rib plate is provided with an overflowing hole; cooling liquid at the oil inlet enters the outer side flow channel, then flows through the overflowing holes and then flows to the oil outlet, or the cooling liquid at the oil inlet enters the outer side flow channel, flows through a part of the overflowing holes, then flows into the inner side flow channel, flows through a part of the overflowing holes from the inner side flow channel, flows to the outer side flow channel and flows to the oil outlet. According to the stator structure, the heat dissipation effect between the adjacent stator iron cores can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator structure, a method for pouring and sealing the stator structure, and a motor. Background Art

[0002] The heat dissipation efficiency of the motor stator is crucial to ensure the normal operation of the motor and extend the life of the motor. The heat dissipation of the motor stator mainly depends on the design of its internal structure and the efficiency of the external heat dissipation system. In order to improve the heat dissipation efficiency of the stator structure, air cooling, liquid cooling and evaporative cooling can be adopted for cooling.

[0003] For example, the core heat dissipation area required by the stator structure of an axial flux motor is the gap channel between the windings. However, in the stator structure in the prior art, the heat dissipation effect of the gap channel of the winding is poor, and there is room for improvement. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a stator structure, which enables the heat between adjacent stator windings to be effectively dissipated or the adjacent stator windings to be cooled by a coolant, thereby improving the heat dissipation effect of the heat between adjacent stator windings.

[0005] According to the stator structure of the embodiment of the present invention, it includes: a plurality of stator cores, a stator shell, a partition and a plurality of ribs; the plurality of stator cores are arranged in the stator shell and are distributed in sequence in the circumferential direction of the stator shell, a stator winding is wound around the stator core, the stator shell includes an outer shell and an inner shell, an outer flow channel is defined between the stator winding and the outer shell, and an inner flow channel is defined between the stator winding and the inner shell, the outer shell is provided with an oil inlet and an oil outlet connected to the outer flow channel; the partition is connected between the outer shell and the stator winding and separates the outer flow channel in the circumferential direction of the stator shell, and the partition is located at the outer shell. between the oil inlet and the oil outlet; each of the ribs is arranged between two adjacent stator cores, at least a portion of the ribs extends into the outer flow channel and is spaced apart from the partition in the circumferential direction of the stator shell, and at least a portion of each of the ribs is provided with a flow hole; wherein, after the coolant at the oil inlet enters the outer flow channel, it is suitable to flow through the flow holes and then flow to the oil outlet, or the coolant at the oil inlet enters the outer flow channel and flows through a portion of the flow holes and then flows into the inner flow channel and flows from the inner flow channel through a portion of the flow holes to the outer flow channel and to the oil outlet.

[0006] According to the stator structure of the embodiment of the present invention, the rib plate transfers the heat in the gap between adjacent stator windings to the outer flow channel, and the rib plate is cooled by the coolant in the outer flow channel, so that the heat between adjacent stator windings can be dissipated as quickly as possible, or the outer flow channel and the inner flow channel are connected through the flow holes of the rib plate, so that the coolant in the outer flow channel flows between adjacent stator windings, thereby improving the heat dissipation effect of the heat between adjacent stator windings.

[0007] According to the stator structure of the embodiment of the present invention, the flow holes are provided at the ends of the ribs, and the flow holes of a plurality of the ribs are connected along the circumference of the stator shell and at the outer flow passage.

[0008] According to the stator structure of the embodiment of the present invention, the oil inlet and the oil outlet are each provided in one, and the partition is provided in one and is located in the middle position between the oil inlet and the oil outlet.

[0009] According to the stator structure of the embodiment of the present invention, the angle between the oil inlet and the oil outlet along the central axis of the stator housing in the radial direction is a, and satisfies: 15°≤a≤180°.

[0010] According to the stator structure of the embodiment of the present invention, the flow holes of the rib plate extend along the outer flow channel toward the inner flow channel and connect the outer flow channel with the inner flow channel.

[0011] According to the stator structure of an embodiment of the present invention, there are at least two oil inlets and at least one oil outlet, wherein the circumferential distance between the two oil inlets is smaller than the circumferential distance between one oil inlet and one oil outlet; at least three partitions are provided, wherein one of the partitions is located between the two oil inlets, another of the partitions is located between one of the oil inlets and the oil outlet, and another of the partitions is located between the other oil inlet and the oil outlet.

[0012] According to the stator structure of the embodiment of the present invention, the central symmetry axis of the two oil inlets passes through the center of the oil outlet.

[0013] According to the stator structure of the embodiment of the present invention, the angle between the two oil inlets along the central axis of the stator housing in the radial direction is b, and satisfies 60°≤b≤270°.

[0014] According to the stator structure of the embodiment of the present invention, one of the inner wall of the shell and the rib plate is provided with a snap-in groove and the other is provided with a snap-in protrusion, one end of the rib plate is snap-connected to the inner wall of the shell and the other end extends between two adjacent stator cores.

[0015] The embodiment of the present invention discloses a method for injection sealing of a stator structure, which is used for the above-mentioned stator structure and includes the following steps: installing the rib plate on the stator shell, assembling the stator core and the stator winding, and positioning and installing the assembled stator core and the stator winding in the stator shell; placing the axial direction of the stator shell in the up-down direction, injecting a first layer of resin solution and making the first layer of resin solution reach at least the lower side of the flow hole in the up-down direction; after the first layer of resin solution solidifies, injecting a molten core solution and making the molten core solution reach at least the upper side of the flow hole; after the molten core solution solidifies, injecting a second layer of resin solution; melting the molten core and letting it flow out.

[0016] According to the infusion sealing method of the stator structure of the embodiment of the present invention, the two axial ends of the stator shell are sealed with resin, and the molten core forms the outer flow channel and the inner flow channel of the stator shell after melting and flowing out, thereby achieving good sealing at the two axial ends of the stator shell.

[0017] According to the infusion sealing method of the stator structure of the embodiment of the present invention, when the first layer of resin solution is injected, the first layer of resin solution is submerged in the lower side of the flow hole by a distance c in the vertical direction, and 0≤c≤8mm is satisfied.

[0018] According to the infusion sealing method of the stator structure of an embodiment of the present invention, when the fusible core is melted and flows out, liquid is injected along the oil inlet, and the melting point of the liquid is greater than or equal to the melting point of the fusible core, and the fusible core flows out along the oil outlet after melting.

[0019] An embodiment of the present invention further discloses a motor, comprising the above-mentioned stator structure.

[0020] The corresponding advantages of the motor and the stator structure are the same and will not be elaborated here.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a front view of a stator housing of an embodiment of the present invention;

[0024] Figure 2 is a side view of a stator case according to an embodiment of the present invention;

[0025] Figure 3 An embodiment of the present invention Figure 2 Cross-sectional view in the AA direction;

[0026] Figure 4 is a stereogram of another viewing angle of an embodiment of the present invention;

[0027] Figure 5 An embodiment of the present invention Figure 4 Schematic diagram of the internal structure;

[0028] Figure 6 This is a schematic diagram of the injection molding perspective of the stator shell of the present invention in the axial direction;

[0029] Figure 7 2 is a schematic structural diagram of a sickle-shaped rib plate applicable to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the sickle-shaped rib plate applicable to another embodiment of the present invention. Figure 1 ;

[0031] Fig. 9 This is a schematic diagram of the structure of the sickle-shaped rib plate applicable to another embodiment of the present invention. Figure 2 ;

[0032] Fig.10 This is a schematic diagram of the structure of the sickle-shaped rib plate applicable to another embodiment of the present invention. Figure 3 ;

[0033] Fig.11 is a front view of a stator housing of another embodiment of the present invention;

[0034] Fig.12 is a side view of a stator case according to another embodiment of the present invention;

[0035] Fig.13 Another embodiment of the present invention is Fig.12 BB cross-sectional view;

[0036] Fig.14 It is a schematic structural diagram of a rectangular rib plate applicable to an embodiment of the present invention;

[0037] Fig.15 This is a schematic diagram of the structure of a rectangular rib plate applicable to another embodiment of the present invention. Figure 1 ;

[0038] Fig.16 This is a schematic diagram of the structure of a rectangular rib plate applicable to another embodiment of the present invention. Figure 2 ;

[0039] Fig.17 This is a schematic diagram of the structure of a rectangular rib plate applicable to another embodiment of the present invention. Figure 3 ;

[0040] Fig.18 It is a schematic diagram of the injection sealing process of the stator structure of an embodiment of the present invention.

[0041] Reference numerals:

[0042] Stator structure 100,

[0043] Outer shell 1, oil inlet 2, oil outlet 3, partition 4, stator core 5, cooling channel 6, outer channel 61, inner channel 62, inner shell 7, rib 8, flow hole 81, first hole section 811, extended hole section 812, first side 82, second side 83, lower side 84, upper side 85, stator winding 9, resin layer 10, fusible core 11, snap-in groove 12, snap-in protrusion 13. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Reference below Figure 1-Figure 18The stator structure 100 according to the embodiment of the present invention is described, the rib plate 8 transfers the heat of the gap between adjacent stator windings 9 to the outer flow channel 61, and cools the rib plate 8 through the coolant in the outer flow channel 61, so that the heat between adjacent stator windings 9 can be dissipated as soon as possible, or the outer flow channel 61 and the inner flow channel 62 are connected through the flow hole 81 of the rib plate 8, so that the coolant in the outer flow channel 61 flows between adjacent stator windings 9, thereby improving the heat dissipation effect of the heat between adjacent stator windings 9. At the same time, the rib plate 8 also has the function of increasing structural stability, transferring the torque of the stator core 5 to the stator shell, thereby improving mechanical reliability; in addition, in the embodiment of the present invention, the resin solution is injected into the two ends of the stator shell in the axial direction, and the molten core solution is injected in the middle, and the two end surfaces of the stator shell in the axial direction are sealed after the resin solution solidifies, and the outer flow channel 61 and the inner flow channel 62 are formed after the molten core 11 is melted, thereby improving the overall sealing of the stator shell in the axial direction.

[0048] Reference below Figure 1-Figure 18 The stator structure 100 according to the embodiment of the present invention is described, comprising: a plurality of stator cores 5 , a stator shell, a partition plate 4 and a plurality of ribs 8 .

[0049] Among them, multiple stator cores 5 are arranged in the stator shell and distributed in sequence in the circumferential direction of the stator shell, a stator winding 9 is wound around the stator core 5, the stator shell includes an outer shell 1 and an inner shell 7, an outer flow channel 61 is defined between the stator winding 9 and the outer shell 1, and an inner flow channel 62 is defined between the stator winding 9 and the inner shell 7, the outer shell 1 is provided with an oil inlet 2 and an oil outlet 3 connected to the outer flow channel 61; the partition 4 is connected between the outer shell 1 and the stator winding 9 and separates the outer flow channel 61 in the circumferential direction of the stator shell, and the partition 4 is located between the oil inlet 2 and the oil outlet 3; each rib 8 is provided between two adjacent stator cores 5, at least a portion of the rib 8 extends into the outer flow channel 61 and is spaced apart from the partition 4 in the circumferential direction of the stator shell, and at least a portion of each rib 8 is provided with a flow hole 81.

[0050] When the coolant is injected from the oil inlet 2, the coolant at the oil inlet 2 enters the outer flow channel 61 and is suitable to flow through the flow hole 81 and then flow to the oil outlet 3, or the coolant at the oil inlet 2 enters the outer flow channel 61 and flows through a part of the flow holes 81 and then flows into the inner flow channel 62 and flows from the inner flow channel 62 through a part of the flow holes 81 to the outer flow channel 61 and flows to the oil outlet 3.

[0051] In practice, the stator shell includes an inner shell 7 and an outer shell 1. The inner shell 7 is located inside the outer shell 1 and forms an installation space with the outer shell 1. For example, an annular installation space is formed between the inner shell 7 and the outer shell 1 in the embodiment of the present invention. A plurality of ribs 8 are circumferentially installed on the stator shell, and the stator winding 9 and the stator core 5 are installed and fixed between adjacent ribs 8. One end of each rib 8 is connected to the inner wall of the outer shell 1 and part of the rib 8 is arranged between adjacent stator windings 9 and extends between adjacent stator windings 9. The thickness of the rib 8 can be 1-5 mm. By arranging the rib 8, the structure of the stator shell can be strengthened, the stability of the stator shell can be improved, and the stator core 5 and the stator winding 9 can be positioned.

[0052] Furthermore, after a plurality of stator cores 5 with stator windings 9 are distributed along the circumferential direction of the stator shell, the circumferentially arranged stator windings 9 divide the installation space between the inner shell 7 and the outer shell 1 into an inner flow channel 62 and an outer flow channel 61, that is, the inner flow channel 62 is arranged between the inner shell 7 and the stator windings 9, and the outer flow channel 61 is arranged between the stator windings 9 and the inner wall of the outer shell 1, and a partition 4 is also arranged in the outer flow channel 61, and the partition 4 is located between the oil inlet 2 and the oil outlet 3 of the outer shell 1, that is, after the coolant is injected from the oil inlet 2, the coolant flows along the oil inlet 2 to the outer flow channel 61. Due to the arrangement of the partition 4, the partition 4 guides the coolant, and each rib 8 is provided with a flow hole 81. When the flow holes 81 of the plurality of ribs 8 are connected along the circumferential direction, that is, after the coolant enters the outer flow channel 61, the coolant flows to the outer flow channel 61 on one side of the partition 4, and flows to the oil outlet 3 after circumferential flow.

[0053] It should be noted that the partition 4 is arranged between the stator winding 9 and the inner shell 7. The partition 4 can be in contact with the stator winding 9 or have a tiny gap, which can prevent the coolant from passing through, or produce a large flow resistance, and can only allow a very small amount of cooling oil to pass through, which can be ignored. Therefore, a circulation passage for the coolant can be formed to prevent the coolant from short-circuiting. That is, the coolant enters the outer flow channel 61 from the oil inlet 2 and then flows to the oil outlet 3 after making a circle.

[0054] Moreover, the partition 4 of the embodiment of the present invention is located in the outer flow channel 61, so the connecting wires for connecting multiple stator windings 9 can be arranged in the inner flow channel 62, that is, there is no interference problem between the partition 4 and the connecting wires of multiple stator windings 9.

[0055] In addition, the flow holes 81 of the rib plate 8 can only flow with the outer flow channel 61, or the flow holes 81 of the rib plate 8 can flow with the outer flow channel 61 and the inner flow channel 62 and the flow holes 81 of multiple rib plates 8 flow in the circumferential direction. When the flow holes 81 of the rib plate 8 only flow with the outer flow channel 61, the rib plate 8 transfers the heat in the gap between adjacent stator windings 9 to the outer flow channel 61, and cools the rib plate 8 by the coolant in the outer flow channel 61. For example, the rib plate 8 can be made of aluminum alloy material or other materials with high thermal conductivity, so that the heat between adjacent stator windings 9 can be dissipated as soon as possible. Of course, the coolant in the outer flow channel 61 can also be cooled to the stator. The stator winding 9 is cooled along one side of the stator shell in the radial direction to achieve a better cooling effect on the stator winding 9; when the flow holes 81 of the rib 8 connect the outer flow channel 61 and the inner flow channel 62 and the flow holes 81 of multiple ribs 8 flow in the circumferential direction, the coolant in the outer flow channel 61 flows between adjacent stator windings 9, and then flows to the inner flow channel 62, and can flow from the inner flow channel 62 along other flow holes 81 to the outer flow channel 61, realizing two-way flow of coolant, thereby improving the heat dissipation effect of the heat between adjacent stator windings 9, which can effectively reduce the temperature rise of the motor, improve the efficiency and reliability of the motor, and improve the life of the motor.

[0056] In some embodiments, the flow holes 81 are disposed at the ends of the ribs 8 , and the flow holes 81 of a plurality of ribs 8 are connected along the circumference of the stator case and at the outer flow channel 61 .

[0057] In practice, refer to Figure 7 and Fig.14 As shown, Figure 7 The rib 8 is constructed in a sickle shape. Fig.14 The rib plate 8 is constructed in a rectangular shape, and the flow holes 81 are provided at the ends of the rib plate 8 in the length direction. The length direction of the rib plate 8 is the direction extending in the radial direction of the stator shell when the rib plate 8 is installed in the stator shell. When the coolant flows to the outer flow channel 61, but the flow holes 81 do not extend in the length direction of the rib plate 8, the coolant flows circumferentially through the flow holes 81 of the rib plate 8, that is, when the rib plate 8 is connected between adjacent stator windings 9 and contacts the adjacent stator windings 9, the coolant flows along Figure 7 and Fig.14 The flow holes 81 of any one of the ribs 8 flow circumferentially. Since both sides of the rib 8 are in contact with the adjacent stator windings 9, the coolant cannot flow between the adjacent stator windings 9, or even if there is flow, the small flow amount can be ignored. At this time, the coolant flows circumferentially in the outer flow channel 61.

[0058] Then the flow hole 81 of the rib 8 is arranged at the end of the rib 8, so that the end of the rib 8 with the flow hole 81 can be located in the outer flow channel 61, which facilitates the connection between the flow hole 81 and the outer flow channel 61, and also facilitates the connection of multiple flow holes 81 of multiple ribs 8 along the circumferential direction of the stator winding 9. At this time, the heat of adjacent stator windings 9 is mainly transferred to the outer flow channel 61 and the outer casing 1 through the rib 8, so that the heat between adjacent stator windings 9 can be dissipated.

[0059] In some embodiments, there is one oil inlet 2 and one oil outlet 3 , and there is one partition plate 4 located in the middle between the oil inlet 2 and the oil outlet 3 .

[0060] like Figure 1 and Figure 3 As shown, for the design of small heating power density, the oil inlet 2 and the oil outlet 3 are each set to one, with a height of 5-50mm, the thickness of the shell is 2-20mm, and the oil inlet 2 and the oil outlet 3 are arranged on both sides of the partition 4, wherein the partition 4 is located in the middle position of the oil inlet 2 and the oil outlet 3, and the thickness of the partition 4 is 2-10mm. When the coolant enters the oil inlet 2, a small amount of coolant flows in the direction toward the partition 4, and a large amount of coolant flows in the direction away from the partition 4. The setting of a partition 4 can achieve the effect of drainage, so that the coolant is guided to flow in the direction away from the partition 4 after entering along the oil inlet 2, thereby realizing the normal circulation of the coolant.

[0061] Moreover, the partition 4 is arranged in the middle position of the oil inlet 2 and the oil outlet 3, so that too much coolant will not stay at the position of the oil inlet 2 or the position of the oil outlet 3. When the distance between the partition 4 and the oil inlet 2 is smaller than the distance between the partition 4 and the oil outlet 3, more coolant will stay in the space between the partition 4 and the oil outlet 3, and when the distance between the partition 4 and the oil inlet 2 is larger than the distance between the partition 4 and the oil inlet 2, more coolant will stay in the space between the partition 4 and the oil inlet 2. In the embodiment of the present invention, the partition 4 is arranged in the middle position of the oil inlet 2 and the oil outlet 3, and the coolant staying between the partition 4 and the oil inlet 2 and the coolant staying between the partition 4 and the oil outlet 3 are not too much, which promotes smoother circulation of the coolant and makes the pressure of the oil entering the oil inlet 2 on the partition 4 basically balanced with the pressure of the oil near the oil outlet 3 on the partition 4.

[0062] Moreover, at this time, only one oil inlet 2 and one oil outlet 3 are provided to achieve the cooling effect on the stator core 5 and the stator winding 9, and the structure is simple.

[0063] In some embodiments, the angle between the oil inlet 2 and the oil outlet 3 along the central axis of the stator case in the radial direction is a, and satisfies: 15°≤a≤180°.

[0064] Continue to refer to Figure 3 As shown, that is, the maximum angle between the central axis of the oil outlet 3 along the radial direction of the stator shell and the central axis of the oil inlet 2 along the radial direction of the stator shell is 180°. At this time, the coolant entering from the oil inlet 2 can flow along the outer flow channel 61 to half of the circumference of the stator shell, that is, the coolant can circulate, and the coolant can exert the heat dissipation and cooling effect on the stator winding 9 and the stator core 5; and the angle between the oil outlet 3 and the oil inlet 2 is set to at least 15°, which can facilitate the arrangement of a partition 4 between the oil inlet 2 and the oil outlet 3, so that the partition 4 can guide the coolant in the outer flow channel 61, that is, the coolant in the outer flow channel 61 can cool and dissipate heat for each rib 8, and multiple ribs 8 transfer the heat between multiple groups of adjacent stator windings 9 to the outer flow channel 61 and the stator shell, thereby strengthening the overall structural strength while also solving the heat dissipation problem between adjacent stator windings 9.

[0065] In actual design, if the angle between the oil outlet 3 and the oil inlet 2 along the central axis of the stator shell in the radial direction can be set to 20°, 30°, 50°, etc., the effect of setting the partition 4 between the oil inlet 2 and the oil outlet 3 for drainage can be met, and the coolant can have a longer flow path, which is beneficial to heat dissipation.

[0066] In some embodiments, the flow holes 81 of the rib 8 extend along the outer flow channel 61 toward the inner flow channel 62 and connect the outer flow channel 61 with the inner flow channel 62 .

[0067] Reference Figure 8-10 As shown, Figure 8-10 The rib plate 8 is a sickle-shaped rib plate 8. At this time, the flow hole 81 is open toward the right side of the rib plate 8. Figure 8-10 The right side of the upper end is the second side 83, and the right side below the rib 8 is the first side 82. At this time, the rib 8 is arranged in the length direction, that is, along the radial direction of the stator shell, and there is a space between the first side 82 and the second side 83, that is, in the width direction of the rib 8, so that the coolant can flow from the upper end of the flow hole 81 to the lower end; that is, when the rib 8 is arranged between two adjacent stator windings 9, the coolant can flow along the upper end of the flow hole 81 in the radial direction of the stator shell to the lower end of the flow hole 81. At this time, the coolant can also flow from the outer flow channel 61 to the inner flow channel 62. Figure 8-Figure 10 The difference is that the width of the channel for the coolant to flow from the outer flow channel 61 to the inner flow channel 62 of the stator shell at the flow hole 81 is increased. Therefore, in actual design, the ribs 8 with the three different sizes of flow holes 81 can be arranged between adjacent stator windings 9 according to the actual flow rate requirements of the coolant.

[0068] Similarly, refer to Figure 15-17As shown, in this case, it is a rectangular rib plate 8, and the flow hole 81 of the rectangular rib plate 8 is set to be wide at the upper end and narrow at the lower end, that is, the upper end of the flow hole 81 is a first hole section 811, and the lower end is a second hole section 812. The first hole section 811 of the flow hole 81 is located in the outer flow channel 61, and the second hole section 812 of the flow hole 81 can allow the coolant to flow along the outer flow channel 61 to the inner flow channel 62. At this time, the coolant flows along Fig.15 The width of the channel from the outer channel 61 to the inner channel 62 is less than Fig.16 The width of Fig.16 The width of the channel from the outer channel 61 to the inner channel 62 is less than Fig.17 The width of the outer flow channel 61 to the inner flow channel 62 can be designed differently according to the actual flow rate of the coolant.

[0069] Specifically, the shape of the plurality of ribs 8 arranged in the circumferential direction of the plurality of stator cores 5 of the stator shell can be Figure 15-17 In the three-shape combination design, different shapes of ribs 8 have different flow channels, so the coolant can generate pressure between different ribs 8 through the channels of different flow holes 81, so that the coolant can have the power to flow, thereby improving the heat dissipation effect of the coolant.

[0070] In some embodiments, there are at least two oil inlets 2 and at least one oil outlet 3, wherein the circumferential distance between the two oil inlets 2 is smaller than the circumferential distance between one oil inlet 2 and one oil outlet 3; at least three partitions 4 are provided, wherein one partition 4 is located between the two oil inlets 2, another partition 4 is located between one oil inlet 2 and the oil outlet 3, and another partition 4 is located between the other oil inlet 2 and the oil outlet 3.

[0071] Reference Fig.13 As shown, there are two oil inlets 2 and one oil outlet 3. At this time, the coolant can enter the coolant along two different oil inlets 2, and a partition 4 is provided between adjacent oil inlets 2. Then, after entering the oil inlet 2, the coolant can be guided through the partition 4, so that the coolant flows from the outer flow channel 61 to the inner flow channel 62 along the flow holes 81 of the ribs 8 between adjacent partitions 4. That is, the partition 4 has the function of guiding and gathering the coolant together, and the gathered coolant flows to the inner flow channel 62 along the flow holes 81 of multiple ribs 8 between multiple groups of adjacent stator windings 9. After flowing in the inner flow channel 62, the coolant can also flow along the inner flow direction to the outer flow channel 61, so as to flow out of the oil outlet 3 from the outer flow channel 61. At this time, the coolant effectively cools the two adjacent stator windings 9, and at the same time, the ribs 8 can also transfer the heat of the two adjacent stator windings 9 to the outer flow channel 61, thereby further improving the heat dissipation effect.

[0072] For example, a partition 4 is provided between the two oil inlets 2, and a partition 4 is also provided between each oil inlet 2 and an oil outlet 3. After the coolant enters the outer flow channel 61, the coolant flows circumferentially between the partitions 4 on both sides of an oil inlet 2. At the same time, under the action of the two partitions 4 on both sides of the oil inlet 2, the coolant is guided to the inner flow channel 62 along the flow holes 81 of the ribs 8 between the adjacent stator windings 9. Due to the pressure of the coolant entering the two oil inlets 2, the coolant in the inner flow channel 62 flows to the outer flow channel 61 through the flow holes 81 of the ribs 8 near the oil outlet 3, and flows from the outer flow channel 61 to the oil outlet 3. Fig.13 The middle shear shows the flow direction of the coolant, so that the stator core 5 and both sides of the stator winding 9 as well as the adjacent stator windings 9 can be effectively cooled.

[0073] Of course, in actual design, there can be more than two oil inlets 2, such as three, and there can also be two oil outlets 3. In this case, a partition 4 can be set between every two adjacent oil inlets 2. The principle is the same as above. In the embodiment of the present invention, two oil inlets 2 are designed and one oil outlet 3 is designed, which fully considers the circulation flow path of the coolant. If there are too many oil outlets 3, the flow path will be short and the cooling effect will be poor. Therefore, two oil inlets 2 and one oil outlet 3 are designed to meet the appropriate flow path of the coolant to improve the heat dissipation effect.

[0074] In some embodiments, the central symmetry axis of the two oil inlets 2 passes through the center of the oil outlet 3 .

[0075] That is to say, when the coolant flows from two oil inlets 2 to the same oil outlet 3, the flow path is more uniform, avoiding the situation where the coolant enters from one oil inlet 2 and the flow path is too short and flows out of the oil outlet 3, resulting in poor heat dissipation effect. Moreover, after the coolant flows from the outer flow channel 61 to the inner flow channel 62, and from the inner flow channel 62 to the outer flow channel 61, the flow is more orderly.

[0076] In some embodiments, the angle between the two oil inlets 2 along the central axis of the stator housing in the radial direction is b, and satisfies 60°≤b≤270°.

[0077] In practice, if the angle between the two oil inlets 2 is 80°, it is convenient to arrange the three partitions 4 appropriately, so that the distance between the two partitions 4 on both sides of each oil inlet 2 is appropriate, so that the coolant entering one oil inlet 2 can be guided to the flow hole 81 along the rib 8 to the inner flow channel 62 under the action of the two partitions 4 on both sides, and at the same time, the coolant in the inner flow channel 62 can be better guided to the oil outlet 3, so that the flow path layout of the coolant is more reasonable and the flow resistance is reduced.

[0078] like Fig.13As shown, the two oil inlets 2 are located on the lower side of the stator housing, and the oil inlet 2 is located on the upper side of the stator housing. Fig.13 In the upper and lower directions shown, a partition 4 is located between the two oil inlets 2, and the other two partitions 4 are used to block the oil inlet 2 and the oil outlet 3. The coolant in the inner flow channel 62 is guided to the outer flow channel 61 close to the oil outlet 3 under the action of the oil inlet pressure, so that the coolant flows to the oil outlet 3 more quickly.

[0079] In some embodiments, one of the inner wall of the housing 1 and the rib 8 is provided with a snap-in groove 12 and the other is provided with a snap-in protrusion 13 , one end of the rib 8 is snap-fitted to the inner wall of the housing 1 and the other end extends between two adjacent stator cores 5 .

[0080] In practice, a snap-in groove 12 can be provided on the inner wall of the housing 1, and the snap-in protrusion 13 of the rib plate 8 is the end of the rib plate 8 along the radial direction of the stator shell, and the end of the rib plate 8 along the radial direction of the stator shell is snap-in in the snap-in groove 12, so that the connection of multiple rib plates 8 is more convenient, and the rib plates 8 can be quickly positioned and installed, saving connection time, and the appropriate shape of the rib plate 8 can be selected according to actual conditions. Of course, the snap-in protrusion 13 can also be provided on the inner wall of the stator shell, and the snap-in groove 12 can be provided at one end of the rib plate 8 connected to the inner wall of the stator shell, and the snap-in protrusion 13 is snap-in in the snap-in groove 12; in addition, the depth of the snap-in groove 12 of the housing 1 is 2-10mm, so as to ensure the reliability and convenience of the connection between the rib plate 8 and the housing 1, such as 3mm, 5mm and 6mm, etc. The height of the snap-in groove 12 along the axial direction of the stator shell is 0-10mm less than the height of the stator shell, which provides a connection space for the two end surfaces of the rib plate 8 along the axial direction of the stator shell to connect to other closed stator shell structures. In addition, the flow hole 81 of the rib plate 8 is 2-20 mm away from the side. Fig.14 As shown, the distance between the flow hole 81 of the rib plate 8 and the side edge of the top and the side can be 10 mm, which meets the structural strength required for torque transmission.

[0081] The embodiment of the present invention further discloses a method for sealing a stator structure 100 by injection molding, which is used for the above-mentioned stator structure 100 and includes the following steps:

[0082] S1: Install the rib plate 8 on the stator shell, assemble the stator core 5 and the stator winding 9, and position and install the assembled stator core 5 and the stator winding 9 in the stator shell.

[0083] In practice, the stator core 5 and the stator winding 9 can be first assembled as a whole, and then a plurality of ribs 8 can be connected to the stator shell one by one, so that a setting space for installing the stator core 5 and the stator winding 9 is formed between adjacent ribs 8, and the stator core 5 connected with the stator winding 9 is positioned and installed between two adjacent ribs 8, and the stator winding 9 is in contact with the ribs 8, so that the stator core 5 and the stator winding 9 are positioned and installed in the stator shell.

[0084] Moreover, by providing the ribs 8, firstly the strength and stability of the stator shell can be increased, and on the other hand, the torque generated by the stator core 5 can be transmitted to the outer shell 1 when the motor is running. At the same time, the flow holes 81 provided on the ribs 8 can achieve the function of guiding the coolant, thereby improving the heat dissipation effect of the stator core 5 and the stator winding 9.

[0085] S2: The stator case is placed in the axial direction in the up-down direction, and a first layer of resin solution is injected so that the first layer of resin solution at least reaches the lower side 84 of the flow hole 81 in the up-down direction.

[0086] That is, when the circumference of the stator shell is placed in the up-down direction, the first layer of resin solution can flow downward under the action of gravity. At this time, the width direction of the rib 8 is the up-down direction. When the first layer of resin solution reaches at least the lower side 84 of the flow hole 81, Fig.14 and Fig.15 As shown, the rib 8 is arranged in the radial direction, and both sides of the rib 8 are in contact with the stator winding 9. When the axial direction of the stator shell is placed in the up-down direction, the lower side 84 of the flow hole 81 of the rib 8 can be understood as Fig.14 and Fig.15 As shown in the lower side 84, the first layer of resin solution forms a first resin layer after solidification, and the first resin layer can form an end surface of one axial end of the stator shell, thereby sealing the one axial end of the stator shell.

[0087] Moreover, the resin solution has good anti-corrosion effect and stability, and has good heat resistance and wear resistance, which prevents the stator winding 9 and the stator core 5 from being affected by the temperature increase, so that the first layer of resin layer after solidification can better seal the end face of the stator shell in the axial direction, prevent coolant leakage, and prevent external water from entering the stator winding 9 and the stator core 5 and affecting the stator winding 9 and the stator core 5. If the stator winding 9 contacts water, it may cause a short circuit and damage the winding. Impurities and chemical components in the water may also corrode the stator winding 9, affecting its conductivity and service life.

[0088] In addition, when the resin liquid is injected at least when the lower side 84 is reached, the injection of the resin liquid can be stopped to prevent the flow hole 81 from being blocked by the continued injection of more injection liquid. At this time, the first layer of resin solution can also be slightly higher than the lower side 84 of the flow hole 81, so that the flow hole 81 is reserved and the coolant is guaranteed to flow along the flow hole 81 to cool the stator core 5 and the stator winding 9.

[0089] S3: After the first layer of resin solution solidifies, the solution of the fusible core 11 is injected so that the solution of the fusible core 11 at least reaches the upper side 85 of the flow hole 81;

[0090] In practice, the fusible core 11 can be made of paraffin material. The characteristic of paraffin material is that the melting point is between 47°C and 64°C, and the melting point of resin material is generally between 225°C and 235°C, that is, the melting point of paraffin material is much lower than that of resin material. Therefore, when the paraffin is melted, the resin can be kept in a solidified state. The paraffin is arranged between the upper side 85 and the lower side 84 of the flow hole 81. Then, when the paraffin is melted, the outer flow channel 61 and the inner flow channel 62 of the rib 8 can be formed.

[0091] S4: After the molten core 11 solution solidifies, the second layer of resin solution is injected.

[0092] Among them, after the solution of the fusible core 11 solidifies, the second layer of resin solution is injected. The fusible core 11 can not only support the second layer of resin solution, but also form a sealing surface of the other end face of the stator shell after solidification. Combined with the design of the first layer of resin solution, both end faces of the stator shell can be sealed, thereby having a good protective effect on the stator winding 9 and the stator core 5, preventing the leakage of coolant, and preventing external moisture from entering the stator winding 9 and the stator core 5, which may corrode the stator core 5 and the stator winding 9 or cause a current short circuit.

[0093] In addition, the thickness of the resin layer 10 at both ends is roughly the same, and the thickness difference does not exceed 1 mm, so as to keep the thickness of the two end surfaces uniform and prevent uneven thermal expansion caused by the different thickness of the resin layer 10 at both ends, thereby avoiding mechanical damage caused by thermal stress.

[0094] S5: Melt the molten core 11 and flow out.

[0095] Specifically, Figure 6 As shown, after the first layer of resin solution and the second layer of resin solution solidify, the fusible core 11 is sandwiched in the middle. After the fusible core 11 is melted, the flow holes 81 of the rib plate 8 can flow coolant. That is, the purpose of adding the fusible core 11 is to form the cooling channel 6 of the stator winding 9 and the stator core 5, and the purpose of adding the resin is to seal the two end faces of the stator shell in the axial direction.

[0096] In some embodiments, when the first layer of resin solution is injected, the distance c that the first layer of resin solution covers the lower side 84 of the flow hole 81 in the vertical direction satisfies 0≤c≤8mm.

[0097] In practice, when the first layer of resin solution covers the lower side 84 of the flow hole 81 by a distance of 0-8 mm, the solidified first and second resin layers can reinforce both sides of the rib 8 in the width direction, thereby improving the stability of the rib 8. At the same time, the distance of 0-8 mm can reduce the impact on the flow hole 81, thereby enabling the coolant to flow along the flow hole 81 to cool the stator core 5 and the stator winding 9. The two layers of resin layers 10 are connected to the rib 8 to prevent the two layers of resin layers 10 from generating gaps with the rib 8 along the axial direction of the stator shell, thereby blocking the coolant from flowing along the gap between the resin layer 10 and the rib 8.

[0098] When the first layer of resin solution is injected, the distance that the first layer of resin solution covers the lower side 84 of the flow hole 81 in the up and down directions is 3 mm, which can not only strengthen the side of the rib 8 from the flow hole 81 to the width direction of the rib 8 by the solidified first layer of resin, but also reduce the influence of the first layer of resin on the flow hole 81.

[0099] In some embodiments, when the fusible core 11 is melted and flows out, liquid is injected along the oil inlet 2 , and the melting point of the liquid is greater than or equal to the melting point of the fusible core 11 , and the fusible core 11 flows out along the oil outlet 3 after melting.

[0100] Among them, the injected liquid can be high-temperature boiling water or other liquids with a melting point higher than paraffin. Generally, high-temperature water is more convenient and can reduce the impact on the stator core 5 and the stator winding 9. For example, high-temperature liquid water or other incompatible liquids with a melting point slightly higher than the melting point of the fusible core 11 are repeatedly introduced along the oil inlet 2 until the fusible core 11 is completely melted and flushed out, thereby forming an internal cooling channel 6, and at the same time does not affect the two layers of resin 10 after solidification.

[0101] The embodiment of the present invention further discloses a motor, comprising the above-mentioned stator structure 100.

[0102] The embodiment of the present invention enables the heat between adjacent stator windings 9 to be effectively dissipated or the adjacent stator windings 9 to be cooled, thereby improving the heat dissipation effect of the heat between adjacent stator windings 9, and further enabling the stator windings 9 and the stator core 5 to have a better heat dissipation effect, thereby effectively reducing the temperature rise of the motor, improving the efficiency and reliability of the motor, and increasing the life of the motor.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0104] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator structure, characterized in that: include: A plurality of stator cores; A stator shell, wherein a plurality of stator cores are arranged in the stator shell and are sequentially distributed in the circumferential direction of the stator shell. The stator core is wound with a stator winding, the stator shell comprises an outer shell and an inner shell, an outer flow channel is defined between the stator winding and the outer shell, and an inner flow channel is defined between the stator winding and the inner shell, and the outer shell is provided with an oil inlet and an oil outlet communicated with the outer flow channel; a partition, the partition being connected between the housing and the stator winding and separating the outer flow passage in the circumferential direction of the stator housing, the partition being located between the oil inlet and the oil outlet; A plurality of ribs, each of which is disposed between two adjacent stator cores, at least a portion of the ribs extends into the outer flow channel and is spaced apart from the partition in the circumferential direction of the stator shell, and at least a portion of each of the ribs is provided with a flow hole; Among them, the coolant at the oil inlet enters the outer flow channel and is suitable for flowing through the flow holes and then flowing to the oil outlet, or the coolant at the oil inlet enters the outer flow channel and flows through a part of the flow holes and then flows into the inner flow channel and flows from the inner flow channel through a part of the flow holes to the outer flow channel and flows to the oil outlet.

2. The stator structure according to claim 1, characterized in that: The flow holes are arranged at the ends of the ribs, and the flow holes of a plurality of the ribs are connected along the circumferential direction of the stator shell and at the outer flow passage.

3. The stator structure according to claim 1, characterized in that: The oil inlet and the oil outlet are each provided in one piece, and the partition is provided in one piece and is located in the middle position between the oil inlet and the oil outlet.

4. The stator structure according to claim 3, characterized in that: The angle between the oil inlet and the oil outlet along the central axis of the stator housing in the radial direction is a, and satisfies: 15°≤a≤180°.

5. The stator structure according to claim 1, characterized in that: The flow holes of the rib plate extend along the outer flow channel toward the inner flow channel and connect the outer flow channel with the inner flow channel.

6. The stator structure according to claim 5, characterized in that: There are at least two oil inlets and at least one oil outlet, wherein the circumferential distance between the two oil inlets is smaller than the circumferential distance between one oil inlet and one oil outlet; The partitions are arranged in at least three parts, wherein one of the partitions is located between the two oil inlets, another of the partitions is located between one of the oil inlets and the oil outlet, and another of the partitions is located between another of the oil inlets and the oil outlet.

7. The stator structure according to claim 6, characterized in that: The central symmetry axis of the two oil inlets passes through the center of the oil outlet.

8. The stator structure according to claim 7, characterized in that: The angle between the two oil inlets along the central axis of the stator housing in the radial direction is b, and satisfies 60°≤b≤270°.

9. The stator structure according to claim 1, characterized in that: One of the inner wall of the shell and the rib plate is provided with a clamping groove and the other is provided with a clamping protrusion. One end of the rib plate is clamped to the inner wall of the shell and the other end extends between two adjacent stator cores.

10. A method for sealing a stator structure by injection molding, characterized in that: The stator structure according to any one of claims 1 to 9 comprises the following steps: Installing the rib plate on the stator shell, assembling the stator core and the stator winding, and positioning and installing the assembled stator core and the stator winding in the stator shell; The axial direction of the stator shell is placed in the up-down direction, and a first layer of resin solution is injected so that the first layer of resin solution reaches at least the lower side of the flow hole in the up-down direction; After the first layer of resin solution solidifies, injecting a fusible core solution so that the fusible core solution at least reaches the upper side of the flow hole; After the molten core solution solidifies, injecting a second layer of resin solution; The molten core is melted and flows out.

11. The method for sealing a stator structure by injection molding according to claim 10, characterized in that: When the first layer of resin solution is injected, the first layer of resin solution is submerged over the lower side of the flow hole by a distance c in the vertical direction, and 0≤c≤8mm is satisfied.

12. The method for sealing a stator structure by injection molding according to claim 10, characterized in that: When the fusible core is melted and flows out, liquid is injected along the oil inlet, and the melting point of the liquid is greater than or equal to the melting point of the fusible core, and the fusible core flows out along the oil outlet after melting.

13. A motor, characterized in that: The stator structure comprises the stator structure described in any one of claims 1 to 9.

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