Stator structure, motor and vehicle

Abstract

The invention relates to the technical field of motors, and provides a stator structure, a motor and a vehicle, and the stator structure comprises a housing which is provided with an oil inlet hole at one end and an oil outlet hole at the other end; the stator core is arranged in the shell, and a plurality of winding grooves for accommodating windings are formed in the stator core at intervals in the circumferential direction; the oil blocking piece comprises a plurality of first blocking parts and a plurality of second blocking parts, the first blocking parts are located at the two ends of the stator core respectively and matched with the diameter of the inner ring of the stator core, and the first blocking parts extend in the axial direction and abut against the shell; and the plurality of second stop parts are fixedly connected with the plurality of first stop parts, and the plurality of second stop parts are respectively and correspondingly positioned at the opening positions of the plurality of winding grooves. According to the technical scheme, the winding at the end of the motor can be subjected to comprehensive soaking cooling, and the cooling effect on the winding is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular, to a stator structure, a motor and a vehicle. Background Art

[0002] At present, high-performance drive motors generally adopt oil cooling, and the cooling of the stator end is mainly based on the spraying solution. The winding is the main heat source of the motor, and the winding at the end of the stator core is mainly cooled by spraying oil. However, due to the irregular surface structure of the winding at the end of the motor, it is difficult to spray the oil evenly, resulting in poor cooling effect. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a stator structure, a motor and a vehicle, which can fully immerse and cool the windings at the ends of the motor, thereby improving the cooling effect of the windings.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] In the first aspect, the present application provides a stator structure, including: a shell, one end of which is provided with an oil inlet hole, and the other end of which is provided with an oil outlet hole; a stator core, which is arranged in the shell, and the stator core is provided with a plurality of winding slots for accommodating windings at circumferential intervals; an oil retaining member, including a plurality of first stop portions and a plurality of second stop portions, the plurality of first stop portions are respectively located at the two ends of the stator core and are adapted to the inner ring diameter of the stator core, and the first stop portions extend axially and abut against the shell; a plurality of second stop portions are all fixedly connected to a plurality of first stop portions, and a plurality of second stop portions are respectively located corresponding to the opening positions of the plurality of winding slots.

[0006] As an embodiment, the oil baffle also includes a plurality of limiting portions, the number of the limiting portions is the same as the number of the winding slots, the limiting portions are fixedly connected to the first stop portion and are located at one end of the stator core, and the limiting portions and the first stop portion enclose a accommodating area for fixing the winding.

[0007] As an embodiment, the limiting portion includes two first side edges, the two first side edges extend along the radial direction of the stator core, and the distance between the two first side edges is smaller than the distance between two slot side walls in the corresponding direction of the winding slot.

[0008] As an embodiment, the limiting portion further includes a second side edge, the second side edge is respectively connected to the two first side edges, and at least one groove is provided on the first side edge and / or the second side edge.

[0009] As an embodiment, the shell includes at least one end cover, and the first stopper abuts against the end cover and is sealedly connected to the end cover.

[0010] As an implementation mode, the oil retaining member and the stator core are integrally formed by injection molding.

[0011] As an implementation manner, the oil blocking member is an elastic hard member.

[0012] As an embodiment, a plurality of first cooling oil channels are provided at intervals on the outer surface of the stator core, and a plurality of second cooling oil channels are provided along the radial direction of the body of the stator core.

[0013] In a second aspect, the present application provides a motor, comprising the stator structure provided in the first aspect, and further comprising a rotor structure, wherein the rotor structure is located within the inner ring diameter of the stator core and is coaxial with the stator core.

[0014] In a third aspect, the present application provides a vehicle, comprising a motor provided in the second aspect.

[0015] The technical solution of this application has the following effects:

[0016] A stator core is arranged in the shell, and an oil inlet hole is arranged at one end of the shell, and an oil outlet hole is arranged at the other end. A plurality of winding slots are arranged at intervals along the circumferential direction on the stator core, and each winding slot is provided with an opening; the stator structure also includes an oil retaining member, including a plurality of first stop parts and a plurality of second stop parts, the plurality of first stop parts are respectively located at the two ends of the stator core, and are adapted to the inner ring diameter of the stator core, the first stop parts extend axially and abut against the shell, thereby forming an annular chamber in cooperation with the shell; the plurality of second stop parts are all fixedly connected to the plurality of first stop parts, and the plurality of second stop parts are respectively located at the opening positions of the plurality of winding slots, so that the second stop parts seal the winding slots, thereby preventing the cooling oil from leaking out from the opening positions of the winding slots, in this way, the plurality of first stop parts cooperate with the plurality of second stop parts, so that the motor is located in the winding immersed oil cavity at the end, the winding is fully cooled, and the cooling area and cooling effect of the winding are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a stator structure provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a partial explosion structure of a stator structure provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a partial structure of a stator structure provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of an exploded structure of a stator structure provided in an embodiment of the present application;

[0022] Figure 5 Another exploded structural schematic diagram of the stator structure provided in an embodiment of the present application;

[0023] Figure 6 A schematic cross-sectional view of a stator structure provided in an embodiment of the present application;

[0024] Figure 7 A side view of a stator structure provided in an embodiment of the present application;

[0025] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the AA direction.

[0026] Icons: 1-housing; 11-end cover; 111-oil inlet; 12-side peripheral wall; 2-stator core; 21-winding slot; 22-first cooling oil channel; 23-second cooling oil channel; 3-oil retaining member; 31-first stopper; 32-second stopper; 33-limiting portion; 331-first side edge; 332-second side edge; 333-groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] like Figure 1 , 2, 5 and 7, in the first aspect, the embodiment of the present application provides a stator structure, including a shell 1, a stator core 2 is arranged in the shell 1, and an oil inlet hole 111 is arranged at one end of the shell 1, and an oil outlet hole is arranged at the other end, and the stator core 2 is provided with a plurality of winding slots 21 spaced apart along the circumferential direction, and each winding slot 21 is provided with an opening; the stator structure also includes an oil retaining member 3, including a plurality of first stop portions 31 and a plurality of second stop portions 32, the plurality of first stop portions 31 are respectively located at the two ends of the stator core 2, and are adapted to the inner ring diameter of the stator core 2, and the first stop portions 31 extend axially and abut against the shell 1 The plurality of second stoppers 32 are fixedly connected to the plurality of first stoppers 31, and the plurality of second stoppers 32 are respectively located at the opening positions of the plurality of winding slots 21, so that the second stoppers 32 block the winding slots 21, thereby preventing the cooling oil from leaking out from the opening positions of the winding slots 21. In this way, the plurality of first stoppers 31 cooperate with the plurality of second stoppers 32, and when the cooling oil enters from the oil inlet hole 111, the winding at the end of the motor is immersed in the oil cavity, so that the winding is fully cooled, thereby improving the cooling area and cooling effect of the winding.

[0030] Optionally, the first stop portion 31 is a ring structure, and the two ends of the second stop portion 32 are fixedly connected to the two first stop portions 31 respectively. The first stop portion 31 and the second stop portion 32 can be integrally formed by injection molding. In a possible case, the first stop portion 31 and the second stop portion 32 can also be glued.

[0031] Optionally, the stator core 2 includes an outer ring diameter and an inner ring diameter, the outer ring diameter is in contact with the housing 1, and the inner ring diameter is used to accommodate the rotor structure.

[0032] Optionally, the second stop portion 32 in the accompanying drawings does not completely seal the opening of the winding slot 21. In fact, the second stop portion 32 is longitudinally long and consistent with the length of the stator core 2. It is used to seal the opening position of the winding slot 21, so that the winding slot 21 is axially through and has a closed structure on all sides.

[0033] Optionally, the second stopper 32 may be injection-molded at the opening of the winding slot 21 first, and then the first stopper 31 may be injection-molded.

[0034] Optionally, the oil baffle 3 and the stator core 2 can be integrally injection molded to improve the stability between the oil baffle 3 and the stator core 2. However, due to the long length of the stator core 2, it is necessary to pay attention to the draft angle when directly injection molding the second stop portion 32. The injection molding structure of the second stop portion 32 is particularly long, which will cause the space occupied by the second stop portion 32 to increase. Therefore, when injection molding the second stop portion 32, it can be injection molded in sections with the stator core 2. The stator core 2 is formed by stacking multiple stator core 2 sheets. A small section of the stator core 2 can be formed first, and a section of the second stop portion 32 can be injection molded. Then, the multiple sections of the stator core 2 can be welded or riveted.

[0035] Optionally, the first stopper 31 cooperates with the end cover 11 to form an annular chamber. Compared with the end cover 11 forming an annular chamber, the embodiment of the present application can reduce the production process and the cost, and it is also easy to ensure the sealing.

[0036] Optionally, the second stop portion 32 includes an abutting portion and a convex portion, the convex portion is located at the lower end surface of the abutting portion, the convex portion is used to block the opening of the winding slot 21, and the abutting portion is used to overlap two sides of the opening of the winding slot 21.

[0037] like Figure 4 and 6 As shown, as an embodiment, the oil retaining member 3 also includes a plurality of limiting portions 33, the number of the limiting portions 33 is the same as the number of the winding slots 21, the limiting portion 33 is fixedly connected to the first stop portion 31, and the limiting portion 33 has a certain thickness and is located at one end of the stator core 2, the limiting portion 33 and the first stop portion 31 enclose a accommodating area for fixing the winding, and the limiting portion 33 extends axially, that is, the limiting portion 33 has a certain thickness, thereby increasing the contact area with the winding and improving the stability between the winding and the winding; at the same time, by setting the limiting portion 33, the stator structure of the embodiment of the present application eliminates the use of insulating paper and dripping paint to fix the winding. Compared with the prior art of fixing the winding by insulating paper and dripping paint, the dripping paint and insulating paper will occupy the space of the winding slot 21. The solution of the present application can vacate the space in the winding slot 21 without expanding the winding slot 21, so as to cool the winding without sacrificing the slot fill rate.

[0038] Optionally, the limiting portion 33 and the first stopping portion 31 may be integrally formed by injection molding to improve the structural stability of the oil retaining member 3 .

[0039] like Figure 3 and 8As shown, as an embodiment, the limiting portion 33 includes two first side edges 331, and the two first side edges 331 extend along the radial direction of the stator core 2. The distance between the two first side edges 331 is smaller than the distance between the two slot side walls in the corresponding direction of the winding slot 21, so that the winding of the winding slot 21 is not in direct contact with the winding slot 21, which is both insulated and leaves space for cooling oil to flow, so as to cool the winding. At the same time, there is no need to fix the winding by dripping paint, so that more cooling oil can flow through the winding slot 21 of the same size, thereby improving the cooling effect.

[0040] Optionally, the distance between the two first sides 331 is smaller than the distance between the two slot side walls in the corresponding direction of the winding slot 21, which may be the layout space of the insulating paper. In this way, more cooling oil can flow and cool in the winding slot 21 of the original size, thereby improving the cooling effect.

[0041] Optionally, the cross section of the winding slot 21 can also be regarded as a rectangle, in which one short side is set at the opening, the two long sides correspond to the two first side edges 331 respectively, and the distance between the two first side edges 331 is greater than the distance between the two long sides of the winding slot 21.

[0042] like Figure 2 , 3 As shown in FIG. 8 , as an embodiment, the limiting portion 33 also includes a second side 332, and the second side 332 is respectively connected to the two first side 331, and at least one groove 333 is provided on the first side 331 and / or the second side 332, so that the cooling oil can enter the winding slot 21 through the groove 333 to cool the winding.

[0043] In the prior art, most of the winding slots 21 need to be arranged with insulating paper and windings, and finally the gaps are filled by dripping paint, and there is no space for oil. There are two main solutions. One direction is to expand the winding slot 21 or design various special-shaped slot structures, and then pass oil through the expanded part to cool the winding. Such a solution will sacrifice the slot full rate, affect the system torque performance and efficiency, and this solution is difficult to drip paint to fix (the flowing paint will penetrate everywhere and fill the expanded part), resulting in poor overall rigidity of the system, and then lead to poor NVH (Noise, Vibration, Harshness, noise, vibration and acoustic roughness) effect. Another direction is not to arrange insulating paper, nor to drip paint, and use the original insulating paper space for oil, but without insulating paper, the winding will directly contact the iron core, and the risk of insulation breakdown will be greatly increased, making it difficult for the system to ensure reliability. At the same time, due to the lack of dripping paint fixation, the NVH effect will decrease.

[0044] The present invention adopts a solution without arranging insulating paper or dripping paint. The opening of the winding slot 21 is closed by injection molding the second stopper 32 and the stator core 2. At the same time, a limiting portion 33 is injection molded at the end of the stator core 2 to fix the winding in the middle of the winding slot 21, so that the winding can be fixed without contacting the stator core 2. The original efficiency, torque and other performance can be maintained without reduction, and insulation risks and NVH risks can be avoided. The winding at the end of the motor is immersed in cooling oil, and the cooling solution of oil passing through the winding slot 21 greatly improves the cooling efficiency, thereby improving the system's continuous power, efficiency and other performance.

[0045] like Figure 4 and 6 As shown, as an embodiment, the housing 1 includes at least one end cover 11, and the first stop portion 31 abuts against the end cover 11 and is sealed with the end cover 11, so that the first stop portion 31 cooperates with the end cover 11 to form a sealed annular chamber for immersing the end winding in cooling oil.

[0046] Optionally, the oil retaining member 3 may be made of an elastic material, so that there is no need to provide vulcanized rubber or a sealing ring to seal with the end cover 11 .

[0047] Optionally, the position where the first stopper 31 abuts against the end cap 11 can be sealed by vulcanized rubber or adding a sealing ring. Of course, in a possible case, a plug-in form can also be adopted, that is, the end cap 11 is provided with a circle groove, and the first stopper 31 is inserted into the groove.

[0048] Optionally, the shell 1 may be provided with only one end cover 11, and the end cover 11 at the other end may be integrally formed with the side circumferential wall 12, and the two end covers 11 may be provided with an oil inlet hole 111 and an oil outlet hole, respectively. The oil inlet hole 111 and the oil outlet hole may be arranged in the axial direction of the end cover 11, or may be arranged on the side of the end cover 11; of course, the shell 1 may also include two end covers 11, and the two end covers 11 are respectively connected to the side circumferential wall 12.

[0049] Optionally, the shell 1 also includes a side wall 12. If the shell 1 includes an end cover 11, one end of the side wall 12 is connected to the end cover 11, the side wall 12 is in contact with the stator core 2, and the other end of the side wall 12 serves as the bottom wall of the shell 1; if the shell 1 includes two end covers 11, the two ends of the side wall 12 are respectively connected to the two end covers 11.

[0050] Optionally, the end cover 11 is annular, and the inner diameter of the end cover 11 may be provided with a folded edge, which may fit with the first stopper 31 to improve the sealing between the end cover 11 and the first stopper 31 .

[0051] As an implementation mode, the oil retaining member 3 and the stator core 2 are integrally formed by injection molding, thereby improving the stability between the oil retaining member 3 and the stator core 2 .

[0052] As an implementation method, the oil retainer 3 is an elastic hard part. On the one hand, the elastic performance of the oil retainer 3 can save the sealing ring structure without vulcanized rubber or adding a sealing ring to the end cover 11; on the other hand, the winding can be better constrained by a certain elastic force, that is, the oil retainer 3 can be made of a material that still has a certain elasticity after injection molding, which helps the structure buffer and improves the NVH effect to a certain extent. The oil retainer 3 also needs to have a certain hardness and rigidity, so that it can play a role in fixing and supporting the winding.

[0053] Optionally, the oil baffle 3 is in direct contact with the winding, so the oil baffle 3 also needs to have a certain high temperature resistance. Therefore, the oil baffle 3 can be made of thermoplastic elastomer, polyphenylene sulfide, polycarbonate plastic or other plastic materials.

[0054] like Figure 3 As shown, as an embodiment, a plurality of first cooling oil channels 22 are provided at intervals on the outer surface of the stator core 2, and a plurality of second cooling oil channels 23 are provided along the radial direction of the body of the stator core 2, thereby improving the cooling effect of the stator core 2.

[0055] Optionally, the first cooling oil channel 22 may cooperate with the side peripheral wall 12 of the housing 1 to cool the stator core 2 .

[0056] In a second aspect, an embodiment of the present application provides a motor, which includes the stator structure provided in the first aspect, and also includes a rotor structure, wherein the rotor structure is located within the inner ring diameter of the stator core 2 and is coaxial with the stator core 2.

[0057] In a third aspect, an embodiment of the present application provides a vehicle, on which the motor provided by the second aspect is installed.

[0058] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A stator structure, characterized in that: include: A housing, one end of which is provided with an oil inlet hole and the other end of which is provided with an oil outlet hole; A stator core is disposed in the housing, wherein the stator core is provided with a plurality of winding slots for accommodating windings at intervals along the circumferential direction; The oil stop part includes a plurality of first stop parts and a plurality of second stop parts, wherein the plurality of first stop parts are respectively located at the two ends of the stator core and are adapted to the inner ring diameter of the stator core, and the first stop parts extend axially and abut against the shell; the plurality of second stop parts are all fixedly connected to the plurality of first stop parts, and the plurality of second stop parts are respectively located corresponding to the opening positions of the plurality of winding slots.

2. The stator structure according to claim 1, characterized in that: The oil retaining member also includes a plurality of limiting portions, the number of the limiting portions is the same as the number of the winding slots, the limiting portion is fixedly connected to the first stop portion and is located at one end of the stator core, and the limiting portion and the first stop portion enclose a accommodating area for fixing the winding.

3. The stator structure according to claim 2, characterized in that: The limiting portion includes two first side edges, the two first side edges extend along the radial direction of the stator core, and the distance between the two first side edges is smaller than the distance between two slot side walls in the corresponding direction of the winding slot.

4. The stator structure according to claim 3, characterized in that: The limiting portion further includes a second side edge, wherein the second side edge is respectively connected to the two first side edges, and at least one groove is provided on the first side edge and / or the second side edge.

5. The stator structure according to any one of claims 1 to 4, characterized in that: The housing includes at least one end cover, and the first stopper abuts against the end cover and is sealedly connected to the end cover.

6. The stator structure according to any one of claims 1 to 4, characterized in that: The oil retaining member is integrally formed with the stator core by injection molding.

7. The stator structure according to any one of claims 1 to 4, characterized in that: The oil blocking member is an elastic hard member.

8. The stator structure according to any one of claims 1 to 4, characterized in that: A plurality of first cooling oil channels are arranged at intervals on the outer surface of the stator core, and a plurality of second cooling oil channels are arranged along the radial direction of the body of the stator core.

9. A motor, characterized in that: The motor comprises the stator structure according to any one of claims 1 to 8, and further comprises a rotor structure, wherein the rotor structure is located within the inner ring diameter of the stator core and is coaxial with the stator core.

10. A vehicle, characterized in that: The vehicle is equipped with the motor according to claim 9.

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