Stator core and motor

Abstract

The utility model provides a stator core and a motor, and the stator core comprises a stacking body which at least comprises a first stator punching sheet and a second stator punching sheet which are stacked. The sealing ring is arranged on the inner side of the stacked body, at least two end parts of the sealing ring are fixedly connected with the second stator punching sheet along the axial direction of the sealing ring so as to form axial sealing, a gap exists between the sealing ring and the inner diameter of the first stator punching sheet so as to form a circumferential oil distribution cavity, and the oil distribution cavity is communicated with each wire slot of the stacked body; and at least part of the first stator punching sheets are provided with the oil inlet grooves, and the oil inlet grooves are communicated with the oil distribution cavity. According to the utility model, the sealing rings are matched with different stator punching sheets to form the oil distribution cavities which are through in the circumferential direction, so that cooling oil flows into different oil inlet grooves to enter each wire slot so as to cool the winding in the slot, the winding can be directly cooled in the slot, and the cooling effect is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a stator core and a motor. Background Art

[0002] With the emergence and continuous development of high-power density motors in new energy vehicles, how to improve and enhance the heat dissipation of motors has received increasing attention. At present, the cooling methods of motors mostly adopt air cooling, water cooling, oil cooling, etc. Compared with air cooling and water cooling, oil has strong heat conduction ability, and the oil liquid has more direct and efficient contact and heat exchange with the main heat-generating area, so oil liquid cooling has gradually become the mainstream trend of driving motor heat dissipation.

[0003] Traditional motors have poor sealing effect of the cooling mechanism, and the cooling oil liquid is easy to flow out to the rotor assembly. The rotor assembly stirs the oil, causing mechanical losses, and at the same time reducing the cooling effect of the motor, further leading to unstable motor efficiency and temperature rise. In addition, adding an oil cooling structure to a traditional motor easily causes an increase in the volume of the motor.

[0004] At the same time, one of the main heat sources for the stator is the winding, and the temperature in the stator slot is the highest during actual operation. The current mainstream methods for cooling the winding include spraying the winding through a spray oil pipe, but this method occupies a large space and the cooling uniformity is not ideal; there is also a method of cooling the winding by axially opening an oil groove in the yoke part of the stator core and arranging oil rings with holes at the upper and lower ends, and a method of spraying the winding from bottom to top by opening an oil passage in the middle of the motor stator core and axially arranging an oil groove leading to the winding directly. However, the above-mentioned schemes not only have complex assembly processes but also are difficult to achieve the purpose of cooling the highest temperature part of the stator. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a stator core and a motor to improve the problems of poor sealing effect of the cooling mechanism of traditional motors and the inability to effectively dissipate heat from the winding in the slots of the stator core.

[0006] To achieve the above purpose and other related purposes, the present utility model provides a stator core, including:

[0007] A stacked body, at least including stacked first stator punching sheets and second stator punching sheets;

[0008] A sealing ring, arranged inside the stacked body. Along the axial direction of the sealing ring, at least at both ends of the sealing ring, it is fixedly connected to the second stator punching sheet to form an axial seal, and there is a gap between the inner diameter of the sealing ring and the first stator punching sheet to form a circumferential oil distribution cavity, and the oil distribution cavity is communicated with each wire slot of the stacked body;

[0009] An oil inlet groove is provided on at least a part of the first stator punching, and the oil inlet groove communicates with the oil distribution cavity.

[0010] In an embodiment of the present invention, the inner diameter of the first stator punching is greater than the inner diameter of the second stator punching.

[0011] In an embodiment of the present invention, the sealing ring includes an annular main body part and protruding parts arranged at circumferential intervals along the annular main body part, the protruding parts extend along the axial direction of the annular main body part, and each protruding part corresponds to one of the wire grooves.

[0012] In an embodiment of the present invention, both sides of the pole shoe part of the second stator punching are clamped and fixed with two of the protruding parts.

[0013] In an embodiment of the present invention, engaging grooves extending axially are provided on both sides of the protruding part, the pole shoe part is engaged in the engaging grooves, and the outer circumferential surface of the annular main body part is in close fit with the inner diameter surface of the second stator punching.

[0014] In an embodiment of the present invention, the second stator punching includes a pole shoe part, the thickness of the pole shoe part is less than the thickness of the tooth part of the second stator punching, and a plurality of through holes are formed in the circumferential direction of the part where the sealing ring is connected to the second stator punching, and the through holes are fixedly connected to the pole shoe part.

[0015] In an embodiment of the present invention, the sealing ring is provided as an integrally injection-molded structure with the stacked body as an insert.

[0016] In an embodiment of the present invention, a plurality of the oil inlet grooves are uniformly arranged along the circumference of the stacked body, the oil inlet grooves are located on the same first stator punching or different first stator punchings; and / or a plurality of the oil inlet grooves are arranged along the axial direction of the stacked body.

[0017] In an embodiment of the present invention, one end of the oil inlet groove communicates with the oil distribution cavity, and the other end communicates with the outer circumferential surface of the stacked body; or, bolt holes are arranged along the circumference of the stacked body, one end of the oil inlet groove communicates with the oil distribution cavity, and the other end communicates with the bolt holes.

[0018] The present invention provides a motor, including: a rotor and a stator, the stator is coaxially disposed around the outer periphery of the rotor, and the stator includes a stator core as described in any one of the above embodiments.

[0019] The present utility model provides a stator core and a motor. By arranging special punching sheets to form a stack body, a sealing ring is arranged inside the stack body. Both sides of the sealing ring are fixedly connected to the second stator punching sheet to form an axial surface. An oil distribution cavity is formed between the sealing ring and the first stator punching sheet. The oil distribution cavity is communicated with each wire groove of the stack body. At the same time, an oil inlet groove is arranged on the first stator punching sheet, so that the cooling oil enters the circumferentially communicated oil distribution cavity through the oil inlet groove, and then flows into different wire grooves, thereby cooling the windings in the grooves, enabling the windings to be directly cooled in the grooves, and achieving a better cooling effect. At the same time, the sealing ring is tightly attached to the inner diameter surface of the stack body to form a seal, and the pole shoe parts of some stator punching sheets in the stack body are snap-connected to the sealing ring to form an axial seal, thus ensuring the sealing performance of the oil cooling structure.

[0020] The present utility model provides a stator core and a motor. By setting some stator punching sheets in the stator core as punching sheets with oil inlet grooves, and at the same time, the pole shoe parts can be cancelled to form an oil distribution cavity due to the gap between the stator punching sheet and the density ring. Since the number of punching sheets with slots in the electromagnetic influence area is very small, the electromagnetic performance is basically not affected, and its structure is simple and easy to process.

[0021] The present utility model provides a stator core and a motor. The oil cooling structure for realizing in-slot cooling in the stator core can be applied to cores with other connection methods such as welded cores, snap points and bonding, etc., and can achieve the same heat dissipation effect; it is also applicable to electromagnetic schemes with different pole-slot combinations; and the cooling oil entering the slots can be ejected from the end of the core to be used in combination with the core during different axial cooling, and the effect of spraying the windings can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the stator core in an embodiment of the present utility model.

[0024] Figure 2 It is a schematic structural diagram of the first stator punching sheet in an embodiment of the present utility model.

[0025] Figure 3 It is a schematic structural diagram of the second stator punching sheet in an embodiment of the present utility model.

[0026] Figure 4 It is a schematic structural diagram of the sealing ring in an embodiment of the present utility model.

[0027] Figure 5 This is a schematic structural diagram of the second stator punching sheet in another embodiment of the present utility model.

[0028] Figure 6 This is a schematic structural diagram of the sealing ring in another embodiment of the present utility model.

[0029] Label description:

[0030] 100, stator core; 10, stack; 20, sealing ring; 101, oil inlet groove; 102, oil distribution cavity; 103, wire groove; 11, first stator punching sheet; 12, second stator punching sheet; 21, annular main body part; 22, protruding part; 201, through hole; 121, pole shoe part; 104, bolt hole. Specific embodiments

[0031] The following specific examples illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0032] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0033] Please refer to Figures 1 to 6 As shown, the present utility model provides a stator core and a motor to improve the problems of poor sealing effect of the cooling mechanism of traditional motors and the inability to effectively dissipate heat from the slot windings of the stator core. Specifically, the stator core 100 can form an oil passage that can enter each wire groove by arranging special punching sheets and a matching sealing ring, so that the cooling oil can enter the slot to directly cool the slot windings.

[0034] Please refer to Figures 1 to 6As shown, in this embodiment, the stator core 100 includes a stack body 10, a sealing ring 20, and an oil inlet groove 101. The sealing ring 20 is disposed inside the stack body 10. Along the axial direction of the sealing ring 20, at least at both end portions of the sealing ring 20, it is fixedly connected to some stator laminations in the stack body 10 to form an axial seal. A gap is formed between a part of the sealing ring 20 and the inner diameter surface of the stack body 10. Specifically, this part refers to the part of the sealing ring 20 except for the part that is fixedly connected to the stack body 10 to form an axial seal, which can form an oil distribution cavity 102 between the sealing ring 20 and the stack body 10 at this gap. The oil distribution cavity 102 runs through circumferentially along the stack body 10. The oil distribution cavity 102 communicates with each wire groove 103 on the stack body 10. At least part of the stator laminations corresponding to the gap formed between the sealing ring 20 and the stack body 10 are provided with the oil inlet groove 101. The oil inlet groove 101 communicates with the oil distribution cavity 102, so that the cooling oil enters the circumferentially communicating oil distribution cavity 102 through the oil inlet groove 101, and then flows into different wire grooves 103 to cool the windings in the grooves, enabling the windings to be directly cooled in the grooves and achieving a better cooling effect.

[0035] Please refer to Figures 1 to 3 As shown, in this embodiment, the stack body 10 at least includes stacked first stator laminations 11 and second stator laminations 12. For example, the stack body 10 is formed by stacking the first stator laminations 11 and the second stator laminations 12 located on both sides of the first stator laminations 11. The first stator laminations 11 are the stator laminations with a gap from the sealing ring 20 to form the oil distribution cavity 102, and the second stator laminations 12 are the stator laminations fixedly connected to the sealing ring 20 to form an axial seal. Specifically, in this embodiment, along the axial direction of the sealing ring 20, at both end portions of the sealing ring 20, it is fixedly connected to the second stator laminations 12 to form an axial seal. The part of the sealing ring 20 between the two ends forms the oil distribution cavity 102 with the first stator laminations 11, and at least part of the first stator laminations 11 are provided with the oil inlet groove 101. The oil inlet groove 101 communicates with the oil distribution cavity 102 to facilitate the cooling oil to flow into each wire groove 103 to achieve in-groove cooling.

[0036] Of course, a plurality of axial sealing regions may be axially spaced apart along the sealing ring 20. That is, in this axial sealing region, the sealing ring 20 is sealingly connected to the second stator lamination 12 to form an axial seal. A part between every two adjacent regions on the sealing ring 20 that form an axial seal forms the oil distribution chamber 102 with the first stator lamination 11. That is, a plurality of the oil distribution chambers 102 are formed along the axis of the sealing ring 20. Each oil distribution chamber 102 is circumferentially through, and an oil inlet groove 101 is provided on the first stator lamination 11 corresponding to each oil distribution chamber 102 to inject cooling oil into each oil distribution chamber 102 through the oil inlet groove 101, so that it flows into each wire groove 103 to realize in-slot cooling.

[0037] Please refer to Figures 1 to 3 As shown, in this embodiment, the inner diameter of the first stator lamination 11 is larger than the inner diameter of the second stator lamination 12, so that an oil distribution chamber 102 is formed between the sealing ring 20 and the first stator lamination 11. In this embodiment, for example, the pole shoe portion of the first stator lamination 11 can be removed to increase the inner diameter of the first stator lamination 11, thereby forming the oil distribution chamber. At the same time, it can also prevent the sealing ring 20 from occupying the air gap space and affecting the assembly with the rotor and the subsequent operation of the motor.

[0038] Please refer to Figures 1 to 4 As shown, in this embodiment, the sealing ring 20 includes an annular main body portion 21 and a protruding portion 22. The protruding portions 22 are arranged at intervals along the circumference of the annular main body portion 21 and are located on the outer circumferential surface of the annular main body portion 21. And the protruding portions 22 extend axially along the annular main body portion 21, and each protruding portion 22 corresponds to a wire groove 103. When the sealing ring 20 is installed with the stack 10, both sides of the pole shoe portion 121 of the second stator lamination 12 are respectively clamped and fixed with two of the protruding portions 22. Specifically, clamping grooves extending axially are provided on both sides of the protruding portion 22, and both sides of the pole shoe portion 121 are respectively connected and matched with the clamping grooves on two of the protruding portions 22 to be clamped in the clamping grooves. And when the sealing ring 20 is connected and matched with the stack 10, the outer circumferential surface of the annular main body portion 21 is closely attached to the inner diameter surface of the second stator lamination 12, and cooperates with the pole shoe portion 121 and the protruding portion 22 to form an axial seal, ensuring that the cooling oil entering the oil distribution chamber 102 will not leak axially to the rotor assembly.

[0039] Please refer to Figures 1 to 4As shown, in this embodiment, a fixed limit structure matching with the second stator punching sheet 12 is provided on the protruding part 22, so as to ensure that when the sealing ring 20 is connected with the stacked body 10 in a matching manner, it can be fixed at the corresponding position, and problems such as sealing failure caused by misalignment or displacement between the sealing ring 20 and the stator punching sheet can be avoided.

[0040] Please refer to Figure 1 , Figure 5 and Figure 6 As shown, in another embodiment, the thickness of the pole shoe part 121 of the second stator punching sheet 12 is less than the thickness of the tooth part of the second stator punching sheet 12. For example, the thickness of the pole shoe part 121 can be reduced by milling. Correspondingly, the part of the sealing ring 20 that cooperates with the second stator punching sheet 12 to form an axial seal is defined as an axial seal area. A plurality of through holes 201 are formed in the circumferential direction of the axial seal area on the sealing ring 20, and the through holes 201 are fixedly connected to the pole shoe part 121 with reduced thickness. In this embodiment, the sealing ring 20 can be an integrally injection-molded structure with the stacked body 10 as an insert, so as to ensure the installation reliability and sealing effect between the sealing ring 20 and the stacked body 10.

[0041] It can be understood that by setting some of the stator punching sheets in the stator core to have oil inlet grooves and appropriately reducing the inner diameter, for example, canceling the punching sheet of the pole shoe part and some punching sheets with appropriately reduced thickness of the pole shoe part, and cooperating with the sealing ring 20, a cooling oil passage for in-slot cooling can be formed. The number of punching sheets with slots for the electromagnetic influence area is very small, and it has basically no influence on the electromagnetic performance. Its structure is simple and easy to process.

[0042] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, a plurality of the oil inlet grooves 101 are uniformly arranged along the circumferential direction of the stacked body 10. The oil inlet grooves 101 can be arranged on the same first stator punching sheet 11, or can be arranged on different first stator punching sheets 11. Of course, a plurality of oil inlet grooves 101 can also be arranged along the axial direction of the stacked body 10, that is, the oil inlet grooves 101 are respectively arranged on different first stator punching sheets 11 along the axial direction of the stacked body 10, and each oil inlet groove 101 communicates with the oil distribution cavity 102.

[0043] Please refer to Figure 1 and Figure 2As shown, in this embodiment, one end of the oil inlet groove 101 communicates with the oil distribution cavity 102, and the other end communicates with the outer circumferential surface of the stacked body 10. That is, the oil inlet groove 101 can be directly formed on the outer circumferential surface of the first stator punching 11 and extend radially thereof to communicate with the oil distribution cavity 102. Of course, it can also be that bolt holes 104 are provided along the circumferential direction of the stacked body 10. One end of the oil inlet groove 101 communicates with the oil distribution cavity 102, and the other end communicates with the bolt holes 104. That is, the oil inlet groove 101 can be formed on the part of the outer circumferential surface of the first stator punching 11 where the bolt holes 104 are provided and extend radially thereof to communicate with the oil distribution cavity 102.

[0044] Of course, the stator core in this application is not limited to a welded core, and can also cover cores with other connection methods such as snap points, bonding, bolt connection, interference connection, etc., and can achieve the same heat dissipation effect. It is also applicable to electromagnetic schemes with different pole-slot combinations, and the cooling oil entering the slots can be ejected from the end of the core to be used in combination with the core during different axial cooling, and the effect of spraying the windings can be achieved.

[0045] Please refer to Figures 1 to 6 As shown, the present utility model also proposes a motor, which includes a rotor (not shown) and a stator. The stator is disposed around the outer circumference of the rotor, and the stator and the rotor are coaxially arranged. The stator includes the stator core 100 described in the above embodiment. It should be noted that the structure of the stator core is similar to or the same as that of the stator core 100 described in the above embodiment. To avoid repetition, it will not be elaborated here.

[0046] It can be understood that the stator core 100 may include a plurality of stacked bodies, and at least one of the stacked bodies is formed by stacking the first stator punching 11 and the second stator punching 12 described in the above embodiment, and is combined with the sealing ring 20 to form a cooling oil passage capable of realizing in-slot cooling.

[0047] The present utility model proposes a stator core and a motor. By setting special punchings and forming a stacked body, a sealing ring is arranged inside the stacked body. Both sides of the sealing ring are fixedly connected to the second stator punching to form an axial surface. An oil distribution cavity is formed between the sealing ring and the first stator punching. The oil distribution cavity communicates with each slot of the stacked body. At the same time, an oil inlet groove is arranged on the first stator punching, so that the cooling oil enters the circumferentially connected oil distribution cavity through the oil inlet groove, and then flows into different slots, thereby cooling the windings in the slots, enabling the windings to be directly cooled in the slots, and the cooling effect is better. At the same time, the sealing ring is tightly attached to the inner diameter surface of the stacked body to form a seal, and the pole shoe parts of some stator punchings in the stacked body are engaged with the sealing ring to form an axial seal, thereby ensuring the sealing performance of the oil cooling structure.

[0048] The present utility model provides a stator core and a motor. By setting some of the stator punching sheets in the stator core as punching sheets of an oil inlet groove, and at the same time, by canceling the pole shoe part, a gap is formed between the stator punching sheet and the density ring to form an oil distribution cavity. The number of punching sheets with slots in the electromagnetic influence area is very small, and it has basically no influence on the electromagnetic performance. Its structure is simple and easy to process.

[0049] The above-described embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model, and should all be included in the protection scope of the present utility model.

[0050] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. To highlight the innovative features of the present utility model, the remaining technical features are not described herein again.

Claims

1. A stator core, characterized in that, Comprising: A stack body, at least including stacked first stator laminations and second stator laminations; A sealing ring, disposed inside the stack body. Axially along the sealing ring, at least at both ends of the sealing ring, it is fixedly connected to the second stator lamination to form an axial seal, and there is a gap between the inner diameter of the sealing ring and the first stator lamination to form a circumferential oil distribution cavity, and the oil distribution cavity communicates with each slot of the stack body; An oil inlet groove, the oil inlet groove is provided on at least part of the first stator lamination, and the oil inlet groove communicates with the oil distribution cavity.

2. The stator core according to claim 1, characterized in that, The inner diameter of the first stator lamination is greater than the inner diameter of the second stator lamination.

3. The stator core according to claim 1, wherein, The sealing ring includes an annular main body part and protruding parts arranged circumferentially at intervals along the annular main body part. The protruding parts extend axially along the annular main body part, and each protruding part corresponds to one slot.

4. The stator core according to claim 3, characterized in that, Both sides of the pole shoe part of the second stator lamination are clamped and fixed to the two protruding parts.

5. The stator core according to claim 4, characterized in that Both sides of the protruding part are provided with engaging grooves extending axially. The pole shoe part is engaged in the engaging grooves, and the outer circumferential surface of the annular main body part is closely attached to the inner diameter surface of the second stator lamination.

6. The stator core according to claim 1, wherein The second stator lamination includes a pole shoe part. The thickness of the pole shoe part is less than the thickness of the tooth part of the second stator lamination. A plurality of through holes are formed circumferentially at the part where the sealing ring is connected to the second stator lamination, and the through holes are fixedly connected to the pole shoe part.

7. The stator core according to claim 6, wherein The sealing ring is set as an integrally injection-molded structure with the stack body as an insert.

8. The stator core according to claim 1, wherein, A plurality of the oil inlet grooves are uniformly arranged circumferentially along the stack body. The oil inlet grooves are located on the same first stator lamination or different first stator laminations; and / or a plurality of the oil inlet grooves are arranged axially along the stack body.

9. The stator core according to claim 1, wherein One end of the oil inlet groove communicates with the oil distribution cavity, and the other end communicates with the outer circumferential surface of the stack body; or, bolt holes are arranged circumferentially along the stack body, one end of the oil inlet groove communicates with the oil distribution cavity, and the other end communicates with the bolt holes.

10. A motor, characterized in that, Comprising: A rotor and a stator. The stator is coaxially disposed around the outer periphery of the rotor, and the stator includes a stator core as described in any one of claims 1 to 9.

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