Motor stator core and motor

Abstract

The motor stator iron core comprises four iron core sections, a second iron core section, a third iron core section and a fourth iron core section are sequentially stacked on the two sides of the first iron core section respectively, an annular groove is formed between the first iron core section and the second iron core section, a first welding groove is formed in the annular groove, and a second welding groove is formed in the second iron core section. The other iron core sections are provided with a plurality of cooling oil channels communicated with the annular groove; the second iron core section is provided with a second welding groove and a third welding groove, the third iron core section is provided with a fourth welding groove, the fourth iron core section is provided with a fifth welding groove, and all the welding grooves form two welding beads. Compared with the prior art, the iron core has the advantages that the annular groove can be rapidly filled with cooling oil introduced into the annular groove, the cooling oil located in the annular groove can evenly enter the multiple cooling oil channels of the second iron core section, the third iron core section and the fourth iron core section, and the spraying effect is good; and the two welding beads are not communicated, so that all the iron core sections can be welded together, and cooling oil in the annular grooves can be prevented from leaking to the outside along the welding beads.

Description

Technical Field

[0001] This utility model relates to a motor stator, and more particularly to a motor stator core and a motor. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Generally, an electric motor mainly includes components such as a stator, rotor, shaft, and bearings. The stator is the core part of the motor and mainly includes a stator core and windings. The windings are wound on the stator core and are used to generate a magnetic field.

[0003] The stator core is made of laminated silicon steel sheets to reduce eddy current losses. During motor operation, the stator core generates a large amount of heat. To dissipate heat, cooling oil channels are provided on the stator core. Cooling oil flows into these channels to carry away heat and extend the motor's service life. However, the existing cooling oil channel structure on the stator core is relatively complex, making it difficult for the cooling oil to flow smoothly and evenly to both sides of the stator core to cool the windings.

[0004] In summary, the technical problem that needs to be solved is how to design a stator core that enables uniform and efficient flow of cooling oil. Utility Model Content

[0005] The purpose of this invention is to overcome the defects of uneven distribution of cooling oil in the prior art by providing a motor stator core and a motor.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] According to one aspect of this utility model, a motor stator core is provided, comprising a first core segment, a second core segment, a third core segment, and a fourth core segment. The second core segment, the third core segment, and the fourth core segment are stacked sequentially on both sides of the first core segment. The outer diameter of the first core segment is smaller than that of the second core segment. An annular groove is formed between the first core segment and the second core segment. The second core segment, the third core segment, and the fourth core segment are provided with multiple cooling oil channels communicating with the annular groove, and cooling oil flows into the annular groove. The annular groove, the second core segment, the third core segment, and the fourth core segment are welded together by two non-communicating weld beads.

[0008] As a preferred technical solution, the annular groove is provided with a first weld groove, the second iron core segment is provided with a second weld groove and a third weld groove, the third iron core segment is provided with a fourth weld groove, and the fourth iron core segment is provided with a fifth weld groove. The first weld groove and the second weld groove form a first weld bead, and the third weld groove, the fourth weld groove and the fifth weld groove form a second weld bead. The first weld bead and the second weld bead are spaced at a fixed angle apart in the circumferential direction of the stator iron core.

[0009] As a preferred technical solution, the second core segment comprises two parts, which are rotated relative to each other at a fixed angle in the circumferential direction; wherein, the second weld groove of the part closer to the first core segment is connected to the annular groove; and the third weld groove of the part closer to the third core segment is connected to the fourth and fifth weld grooves.

[0010] As a preferred technical solution, the second core segment is provided with a plurality of circumferentially distributed first oil grooves, the third core segment is provided with a plurality of circumferentially distributed second oil grooves, and the fourth core segment is provided with a circumferentially distributed third oil groove; the first oil groove, the second oil groove and the third oil groove all extend along the axial direction of the stator core and are connected one-to-one to form cooling oil channels; the cross-sections of the first oil groove, the second oil groove and the third oil groove are all partially annular.

[0011] As a preferred technical solution, the inner diameter of the first oil groove cross-section is less than or equal to the outer diameter of the first iron core segment; the outer diameter of the second oil groove cross-section is greater than the inner diameter of the first oil groove cross-section and less than the outer diameter of the first oil groove cross-section; the outer diameter of the third oil groove cross-section is greater than the inner diameter of the second oil groove cross-section and less than the outer diameter of the second oil groove cross-section.

[0012] As a preferred technical solution, the first oil groove, the second oil groove and the third oil groove are all close to the outer circumference of the stator core.

[0013] As a preferred technical solution, the outer diameters of the second, third, and fourth core segments are equal.

[0014] As a preferred technical solution, the first core segment includes multiple layers of first stator laminations stacked together, the second core segment includes multiple layers of second stator laminations stacked together, the third core segment includes multiple layers of third stator laminations stacked together, and the fourth core includes multiple layers of fourth stator laminations stacked together.

[0015] As a preferred technical solution, keyways are provided on the outer circumferential surfaces of the third and fourth core sections.

[0016] According to another aspect of the present invention, an electric motor is provided, including the aforementioned motor stator core.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) In this utility model, an annular groove is formed between the first core segment and the second core segment. The cooling oil introduced into the annular groove can quickly fill the annular groove. The cooling oil located in the annular groove can evenly enter multiple cooling oil channels of the second core segment, the third core segment and the fourth core segment, resulting in a good spraying effect. Two weld beads are set on the stator core. The two weld beads are not connected, which can not only weld all the core segments together, but also prevent the cooling oil in the annular groove from leaking to the outside along the weld beads.

[0019] 2) The second core segment of this utility model includes two parts, which are connected to the first core segment and the third core segment respectively through the second weld groove and the third weld groove, thus playing the role of a bridge, welding all the core segments together, and preventing the first weld and the second weld from being connected.

[0020] 3) The first oil groove, the second oil groove and the third oil groove of this utility model are arranged in a stepped manner, and the closer they are to the end face of the stator core and the distance to the axis of the stator core, the more they form a centripetal structure, which facilitates the cooling of the windings at both ends of the stator core.

[0021] 4) The outer circumference of the third and fourth core sections of this utility model is provided with keyways. During the assembly of the production line tooling, the core inner diameter and the keyways can be used for positioning to achieve accurate assembly of the stator and the housing. Each core section is composed of multiple stator laminations. The thickness of the core section can be adjusted by increasing or decreasing the number of stator laminations to meet different needs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a motor stator core according to the present invention;

[0023] Figure 2 This is a schematic diagram of a partial structure of a motor stator core according to the present invention;

[0024] Figure 3 This is a schematic diagram of the first stator lamination structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the second stator lamination structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the third stator lamination structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the fourth stator lamination structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the weld structure of this utility model;

[0029] Figure 8 This is a cross-sectional view of a motor stator core according to the present invention;

[0030] Figure 9 This is a schematic diagram of the cooling oil passage structure of this utility model;

[0031] Figure 10 This is a schematic diagram of the overall structure of the cooling oil passage of this utility model;

[0032] The numbers in the diagram are as follows:

[0033] 1. First core segment; 11. Annular groove; 12. First weld groove; 2. Second core segment; 21. Second weld groove; 22. Third weld groove; 23. First oil groove; 3. Third core segment; 31. Fourth weld groove; 32. Second oil groove; 4. Fourth core segment; 41. Fifth weld groove; 42. Third oil groove; 5. First weld bead; 6. Second weld bead; 7. Cooling oil passage; 8. Keyway. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, this utility model provides a motor stator core, including a first core segment 1, a second core segment 2, a third core segment 3, and a fourth core segment 4. The second core segment 2, the third core segment 3, and the fourth core segment 4 are stacked sequentially on both sides of the first core segment 1. The outer diameter of the first core segment 1 is smaller than that of the second core segment 2, while the outer diameters of the second core segment 2, the third core segment 3, and the fourth core segment 4 are the same. Figures 3-6 As shown, the first core segment 1 includes multiple layers of first stator laminations stacked together, the second core segment 2 includes multiple layers of second stator laminations stacked together, the third core segment 3 includes multiple layers of third stator laminations stacked together, and the fourth core includes multiple layers of fourth stator laminations stacked together; the thickness of the core segment can be adjusted by increasing or decreasing the number of stator laminations.

[0037] An annular groove 11 is formed between the first core section 1 and the second core section 2. A first welding groove 12 is provided on the annular groove 11. Multiple cooling oil channels 7 are provided on the second core section 2, the third core section 3 and the fourth core section 4, which are connected to the annular groove 11. Cooling oil is introduced into the annular groove 11 and quickly fills the annular groove 11. The annular groove 11 plays the role of collecting oil. The cooling oil in the annular groove 11 flows into the cooling oil channels 7 at the same time.

[0038] The second core segment 2 is provided with a second weld groove 21 and a third weld groove 22. The second core segment 2 includes two parts, which are rotated at a fixed angle relative to each other in the circumferential direction. The second weld groove 21 on the part closer to the first core segment 1 is connected to the first weld groove 12, or the second weld grooves 21 on both parts are connected to the first weld groove 12. The third weld groove 22 on the part closer to the third core segment 3 is connected to the fourth weld groove 31 and the fifth weld groove 41. The second core segment 2 is provided with a plurality of first oil grooves 23 evenly distributed in a circle. The cross-section of the first oil groove 23 is partially annular.

[0039] The third core section 3 is provided with a fourth welding groove 31. The third core section 3 is provided with a plurality of second oil grooves 32 evenly distributed around the circumference, and the cross-section of the second oil grooves 32 is partially annular.

[0040] The fourth core section 4 is provided with a fifth welding groove 41. The fourth core section 4 is provided with a third oil groove 42 evenly distributed around its circumference, and the cross-section of the third oil groove 42 is partially annular. The outer circumferential surfaces of the third core section 3 and the fourth core section 4 are provided with keyways 8. During assembly of the production line tooling, the inner diameter of the core and the keyway 8 can be used for positioning to achieve accurate assembly of the stator and the housing.

[0041] like Figure 7 As shown, the second weld groove 21 and the first weld groove 12 aligned with it in the axial direction form the first weld bead 5, which welds the first core segment 1 and the second core segment 2 together. The third weld groove 22, the fourth weld groove 31, and the fifth weld groove 41 are aligned in the axial direction to form the second weld bead 6, which welds the second core segment 2, the third core segment 3, and the fourth core segment 4 together. This completes the welding of all core segments. Because the first part and the second part of the second core segment 2 have rotated relative to each other at a certain angle, the first weld bead 5 and the second weld bead 6 are not connected, which can avoid the problem of oil leakage.

[0042] like Figures 8-10 As shown, the first oil groove 23, the second oil groove 32, and the third oil groove 42 are all close to the outer circumference of the stator core. The first oil groove 23, the second oil groove 32, and the third oil groove 42 are connected one-to-one to form a cooling oil channel 7, forming multiple cooling oil channels 7 in total. The first oil groove 23, the second oil groove 32, and the third oil groove 42 are arranged in a stepped manner. The inner diameter of the first oil groove 23 is equal to the outer diameter of the first core segment 1. The outer diameter of the second oil groove 32 is greater than the inner diameter of the first oil groove 23 but less than the outer diameter of the first oil groove 23. The outer diameter of the third oil groove 42 is greater than the inner diameter of the second oil groove 32 but less than the outer diameter of the second oil groove 32.

[0043] Example 2

[0044] This utility model provides an electric motor that uses the motor stator core from Embodiment 1.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electric machine stator core, characterized in that, The application relates to a stator core, which comprises a first core segment (1), a second core segment (2), a third core segment (3) and a fourth core segment (4), the two sides of the first core segment (1) are sequentially stacked with the second core segment (2), the third core segment (3) and the fourth core segment (4) respectively, the outer diameter of the first core segment (1) is smaller than that of the second core segment (2), an annular groove (11) is formed between the first core segment (1) and the second core segment (2), a plurality of cooling oil channels (7) are arranged on the second core segment (2), the third core segment (3) and the fourth core segment (4) and are communicated with the annular groove (11), and cooling oil is introduced into the annular groove (11); the annular groove (11), the second core segment (2), the third core segment (3) and the fourth core segment (4) are welded by two mutually unconnected welding grooves.

2. A motor stator core according to claim 1, characterized in that The annular groove (11) is provided with a first welding groove (12), the second core segment (2) is provided with a second welding groove (21) and a third welding groove (22), the third core segment (3) is provided with a fourth welding groove (31), the fourth core segment (4) is provided with a fifth welding groove (41), the first welding groove (12) and the second welding groove (21) form a first welding groove (5), the third welding groove (22), the fourth welding groove (31) and the fifth welding groove (41) form a second welding groove (6), and the first welding groove (5) and the second welding groove (6) are separated by a fixed angle in the circumferential direction of the stator core.

3. A motor stator core according to claim 1, characterized in that The second core segment (2) comprises two parts, and the two parts are relatively rotated by a fixed angle in the circumferential direction; wherein the second welding groove (21) of one part close to the first core segment (1) is communicated with the annular groove (11), and the third welding groove (22) of one part close to the third core segment (3) is connected with the fourth welding groove (31) and the fifth welding groove (41).

4. A motor stator core according to claim 1, characterized in that The second core segment (2) is provided with a plurality of first oil grooves (23) which are uniformly distributed in the circumferential direction, the third core segment (3) is provided with a plurality of second oil grooves (32) which are uniformly distributed in the circumferential direction, and the fourth core segment (4) is provided with a plurality of third oil grooves (42) which are uniformly distributed in the circumferential direction; the first oil grooves (23), the second oil grooves (32) and the third oil grooves (42) are all extended in the axial direction of the stator core and are communicated one by one to form the cooling oil channels (7); and the cross sections of the first oil grooves (23), the second oil grooves (32) and the third oil grooves (42) are all partially circular annular.

5. A motor stator core according to claim 4, characterized in that The inner diameter of the cross section of the first oil groove (23) is smaller than or equal to the outer diameter of the first core segment (1), the outer diameter of the cross section of the second oil groove (32) is greater than the inner diameter of the cross section of the first oil groove (23) and smaller than the outer diameter of the cross section of the first oil groove (23), and the outer diameter of the cross section of the third oil groove (42) is greater than the inner diameter of the cross section of the second oil groove (32) and smaller than the outer diameter of the cross section of the second oil groove (32).

6. A motor stator core according to claim 4, characterized in that The first oil groove (23), the second oil groove (32) and the third oil groove (42) are all close to the outer circumferential surface of the stator core.

7. A motor stator core according to claim 1, characterized in that The outer diameters of the second core segment (2), the third core segment (3) and the fourth core segment (4) are equal.

8. A motor stator core according to claim 1, characterized in that The first core section (1) comprises a plurality of stacked first stator sheets, the second core section (2) comprises a plurality of stacked second stator sheets, the third core section (3) comprises a plurality of stacked third stator sheets, and the fourth core section comprises a plurality of stacked fourth stator sheets.

9. A motor stator core according to claim 1, characterized in that The third core section (3) and the fourth core section (4) are provided with key grooves (8) on the outer circumferential surfaces thereof.

10. An electric machine characterized by The motor stator core comprises the motor stator core according to any one of claims 1-9.

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