Stator punching sheet, stator core, motor, power assembly and vehicle

Abstract

The utility model belongs to the technical field of motor parts, and particularly relates to a stator punching sheet, a stator core, a motor and a vehicle. The stator punching sheet comprises a stator punching sheet body and a connecting lug connected with the peripheral surface of the stator punching sheet body, the connecting lug is provided with a mounting hole and a through hole, the mounting hole penetrates through the connecting lug along the axial direction of the stator punching sheet, and the through hole is communicated with the mounting hole and extends towards the radial outer side of the mounting hole. At least part of the annular structure, around the mounting hole, of the connecting lug is disconnected by the penetrating opening, so that part of a magnetic circuit at the connecting lug is effectively blocked, and stator magnetic field uniformity is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor parts, and in particular relates to a stator punching sheet, a stator iron core, a motor, a power assembly and a vehicle. Background Art

[0002] The motor includes a stator and a rotor. The stator includes a stator winding and a stator core. The stator core is a cylinder composed of multiple stator punchings stacked together. The rotor is installed in the stator core. After the stator winding is energized, the rotor rotates relative to the stator to generate a rotating magnetic field.

[0003] In order to achieve the lamination of multiple stator punchings, in the motor of the related art, multiple spaced connection ears are provided on the outer circumference of the stator punchings, and the connection ears are provided with through mounting holes. When stacking, the connection ears of all stator punchings are aligned, and the rods of the bolts pass through the mounting holes on the corresponding connection ears and are fastened by nuts to laminate all the stator punchings together.

[0004] However, in the above-mentioned motor, the mounting hole is of fully enclosed design, and a closed ring is formed on the connecting ear at the outer periphery of the mounting hole, which is equivalent to an increase in the outer diameter of the stator punching sheet at the connecting ear. As a result, the stator magnetic field is easily passed through the connecting ear when flowing, causing the magnetic field around the connecting ear to weaken, resulting in an uneven stator magnetic field. Utility Model Content

[0005] The technical problem to be solved by the utility model is: for the motor of the related technology, the stator magnetic field is easy to pass through the connecting ear when flowing, causing the magnetic field around the connecting ear to weaken. A stator punching sheet, a stator core, a motor, a power assembly and a vehicle are provided.

[0006] In order to solve the above technical problems, on the one hand, an embodiment of the utility model provides a stator punching sheet, including a stator punching sheet body and a connecting ear connected to the outer peripheral surface of the stator punching sheet body, the connecting ear is provided with a mounting hole and a through-hole, the mounting hole penetrates the connecting ear along the axial direction of the stator punching sheet, and the through-hole is connected to the mounting hole and extends radially outward of the mounting hole.

[0007] Optionally, the through-hole penetrates the connecting ear along the axial direction of the stator punching sheet.

[0008] Optionally, the through opening penetrates the connecting ear toward the radial outside of the mounting hole.

[0009] Optionally, the through opening has a first opening penetrating through the hole wall of the mounting hole and a second opening penetrating through the outer wall of the connecting ear, and the width of the first opening is smaller than the diameter of the mounting hole.

[0010] Optionally, the width of the second opening is greater than the width of the first opening.

[0011] Optionally, the width of the through opening gradually increases from inside to outside in the radial direction of the stator punching sheet.

[0012] Optionally, the width L1 of the first opening is (1 / 3 to 1 / 2) d, where d is the diameter of the mounting hole.

[0013] Optionally, the width L2 of the second opening is (1.1-1.3)d, where d is the diameter of the mounting hole.

[0014] Optionally, the through opening is located on a radial side of the mounting hole away from the stator punching body.

[0015] Optionally, on a plane parallel to the axial end face of the stator punch body, the shape of the mounting hole is symmetrical, the shape of the through opening is symmetrical, and the symmetry line of the mounting hole and the symmetry line of the through opening are on the same straight line.

[0016] Optionally, a groove communicating with the mounting hole is further provided on the connecting ear, and the groove is located on a radial side of the mounting hole close to the stator punching body.

[0017] Optionally, the groove passes through the connecting ear along the axial direction of the stator punching sheet, and the groove has a third opening that passes through the hole wall of the mounting hole, and the width of the third opening is smaller than the diameter of the mounting hole.

[0018] Optionally, the width L3 of the third opening is (1 / 4 to 1 / 3) d, where d is the diameter of the mounting hole.

[0019] Optionally, on a plane parallel to the axial end face of the stator punch body, the shape of the mounting hole is symmetrical, the shape of the groove is symmetrical, and the symmetry line of the mounting hole and the symmetry line of the groove are on the same straight line.

[0020] Optionally, the bottom wall of the groove is tangent to the annular surface where the outer wall of the stator punch body is located.

[0021] Optionally, the groove has a first side wall and a second side wall opposite to each other in the circumferential direction of the stator punching sheet, the first side wall is connected between one side of the bottom wall of the groove and the hole wall of the mounting hole, and the second side wall is connected between the other side of the bottom wall of the groove and the hole wall of the mounting hole.

[0022] Optionally, the first side wall and the second side wall are parallel to each other and perpendicular to the bottom wall of the groove.

[0023] Optionally, the first side wall and the bottom wall of the groove are in smooth transition, and the second side wall and the bottom wall of the groove are in smooth transition;

[0024] The first side wall smoothly transitions to the hole wall of the mounting hole, and the second side wall smoothly transitions to the hole wall of the mounting hole.

[0025] In the stator punching sheet of the utility model, the through-hole connected to the mounting hole extends radially outward from the mounting hole, so that at least part of the annular structure of the connecting ear around the mounting hole is disconnected by the through-hole, so as to effectively block part of the magnetic circuit at the connecting ear, reduce the magnetic flux flowing to the connecting ear, and further reduce the influence on the magnetic field around the connecting ear, which is conducive to the uniformity of the stator magnetic field.

[0026] On the other hand, an embodiment of the present invention provides a stator core, comprising a plurality of stator punching sheets as described above.

[0027] On the other hand, an embodiment of the present invention provides a motor, comprising the above-mentioned stator core.

[0028] On the other hand, an embodiment of the present invention provides a power assembly including the above-mentioned motor.

[0029] On the other hand, an embodiment of the present invention provides a vehicle, comprising the above-mentioned motor or the above-mentioned power assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a stator punching sheet provided by an embodiment of the utility model;

[0031] Figure 2 yes Figure 1 A magnified view of part A in FIG.

[0032] The reference numerals in the specification are as follows:

[0033] 1. stator punching sheet body; 2. connecting ear; 21. mounting hole; 22. through-hole; 221. first opening; 222. second opening; 23. groove. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a stator punching sheet, including a stator punching sheet body 1 and a connecting ear 2 connected to the outer peripheral surface of the stator punching sheet body 1, the connecting ear 2 is provided with a mounting hole 21 and a through-hole 22, the mounting hole 21 penetrates the connecting ear 2 along the axial direction of the stator punching sheet, and the through-hole 22 is connected to the mounting hole 21 and extends toward the radial outside of the mounting hole 21.

[0036] When multiple stator punching sheets are stacked together, the connecting ears 2 of the multiple stator punching sheets are aligned, and the shank of the bolt is inserted into the mounting hole 21 of the corresponding connecting ear 2 and fastened by the nut to fix the multiple stator punching sheets together.

[0037] Since the through opening 22 is connected to the mounting hole 21 and extends radially outward from the mounting hole 21, at least part of the annular structure of the connecting ear 2 around the mounting hole 21 is disconnected by the through opening 22 to block part of the magnetic circuit at the connecting ear 2, reduce the magnetic flux flowing to the connecting ear 2, and further reduce the impact on the magnetic field around the connecting ear 2, which is beneficial to the uniformity of the stator magnetic field.

[0038] Moreover, due to space limitations, the number of mounting holes 21 is prone to not correspond to the number of stator pole pairs. The stator punching sheets in the prior art will have uneven magnetic fields for the magnetic poles corresponding to the mounting holes 21 and uniform magnetic fields for the magnetic poles staggered from the mounting holes 21, resulting in uneven magnetic fields for the stator core as a whole. Under the action of eccentricity and heavy loads, this defect will be amplified, resulting in large eccentric electromagnetic excitation and noise. In the stator punching sheets of the utility model, the through-hole 22 can effectively block part of the magnetic circuit at the connecting ear 2, reduce the magnetic flux flowing to the connecting ear 2, and thereby reduce the impact on the magnetic field around the connecting ear 2, and weaken the uneven magnetic field of the stator core caused by the mismatch between the number of mounting holes 21 and the number of stator pole pairs, so as to reduce the noise generated by the eccentric electromagnetic excitation under the action of eccentricity and heavy loads.

[0039] In the stator punching sheet of the utility model, the through-hole 22 is connected with the mounting hole 21 and extends radially outward from the mounting hole 21. At least part of the annular structure of the connecting ear 2 around the mounting hole 21 is disconnected by the through-hole 22 to block part of the magnetic circuit at the connecting ear 2, reduce the magnetic flux flowing to the connecting ear 2, and further reduce the influence on the magnetic field around the connecting ear 2, which is beneficial to the uniformity of the stator magnetic field.

[0040] In one embodiment, the through hole 22 penetrates the connecting ear 2 along the axial direction of the stator punching sheet to increase the magnetic circuit at the connecting ear 2 blocked by the through hole 22, improve the blocking effect, and further facilitate the uniformity of the stator magnetic field.

[0041] In one embodiment, the through hole 22 penetrates the connecting ear 2 toward the radial outside of the mounting hole 21 to increase the magnetic circuit at the connecting ear 2 blocked by the through hole 22, improve the blocking effect, and further facilitate the uniformity of the stator magnetic field.

[0042] In one embodiment, the through hole 22 penetrates the connecting ear 2 along the axial direction of the stator punching sheet and penetrates the connecting ear 2 toward the radial outside of the mounting hole 21, so that the through hole 22 disconnects the entire annular structure of the connecting ear 2 around the mounting hole 21, so as to effectively block the annular magnetic circuit at the connecting ear 2, avoiding the situation in the prior art where the stator magnetic field flows to the connecting ear 2, resulting in the weakening of the magnetic field around the connecting ear 2 and the uneven magnetic field of the stator punching sheet.

[0043] In one embodiment, the through opening 22 has a first opening 221 that passes through the hole wall of the mounting hole 21 and a second opening 222 that passes through the outer wall of the connecting ear 2, and the width of the first opening 221 is smaller than the diameter of the mounting hole 21. Since the width of the first opening 221 is smaller than the diameter of the mounting hole 21, the shank of the bolt installed in the mounting hole 21 cannot be separated from the mounting hole 21 through the first opening 221, so that the mounting hole 21 still maintains the function of a fully surrounding hole to limit the radial position of the shank of the bolt, so that the bolt installed in the mounting hole 21 can be used normally.

[0044] It should be noted that it is not necessary for the width of the first opening 221 on all stator punchings to be greater than the diameter of the mounting hole 21. As long as the width of the second opening 222 on at least one of the multiple stator punchings, or the two stator punchings at the end is greater than the diameter of the mounting hole 21, it can also be ensured that the bolt will not fall off.

[0045] In other embodiments, the width of the first openings 221 on all stator punching sheets may be greater than the diameter of the mounting hole 21 . To prevent the bolts from falling off, several non-opening steel plates may be added to the end faces of the connecting ears 2 .

[0046] In one embodiment, if Figure 2 As shown, the width of the second opening 222 is greater than the width of the first opening 221. On the one hand, the blocking effect is improved by increasing the opening. On the other hand, after a plurality of stator punching sheets are stacked together, the corresponding connecting ears 2 are laser welded so that all connecting ears 2 are fixed together to jointly bear the connecting force of the bolts, thereby improving the structural strength of the stator core at the through-opening 22. The through-opening 22 has sharp corners A1, A2, B1, and B2, and the four sharp corners are laser welding positions. When the width of the second opening 222 is greater than the width of the first opening 221, the distance between the sharp corners A1 and B1 and between the sharp corners A2 and B2 can be increased, which is conducive to avoiding interference during welding.

[0047] In one embodiment, the width of the through hole 22 gradually increases from inside to outside in the radial direction of the stator punching sheet, so that the width of the through hole 22 at any location is not less than the width of the first opening 221, further improving the blocking effect.

[0048] In one embodiment, if Figure 2As shown, the width L1 of the first opening 221 is (1 / 3 to 1 / 2) d, where d is the diameter of the mounting hole 21 . The connecting ear 2 within this value range of the width of the first opening 221 can balance the blocking effect and the structure of the connecting ear 2 .

[0049] In one embodiment, if Figure 2 As shown, the width L2 of the second opening 222 is (1.1-1.3) d, where d is the diameter of the mounting hole 21 . The connecting ear 2 having the width of the second opening 222 within this value range can balance the blocking effect and the structure of the connecting ear 2 .

[0050] In one embodiment, the through-hole 22 is located on the radial side of the mounting hole 21 away from the stator punching body 1, so that the through-hole 22 is as close as possible to the middle position of the annular portion of the connecting ear 2 around the mounting hole 21, so as to improve the structural strength of the two sections of the connecting ear 2 disconnected by the through-hole 22, and to ensure the preload force of the bolt connection on the stator punching as much as possible.

[0051] If the pre-tightening force is insufficient, a few closed steel plates or steel sleeves can be added to the end surface of the connecting ear 2 to solve the problem.

[0052] In one embodiment, if Figure 2 As shown, on a plane parallel to the axial end face of the stator punch body 1, the shape of the mounting hole 21 is symmetrical, the shape of the through opening 22 is symmetrical, and the symmetry line of the mounting hole 21 and the symmetry line of the through opening 22 are on the same straight line.

[0053] In one embodiment, if Figure 2 As shown, the connecting ear 2 is also provided with a groove 23 connected with the mounting hole 21, and the groove 23 is located on the radial side of the mounting hole 21 close to the stator sheet body 1. There is a certain distance between the hole wall of the mounting hole 21 and the outer wall of the stator sheet body 1, which causes the outer diameter of the stator sheet at the connecting ear 2 to become larger. Even if the through hole 22 can block the annular magnetic circuit of the connecting ear 2 at the periphery of the mounting hole 21, the stator magnetic field will still flow to the magnetic circuit formed by the distance, causing the magnetic field around the connecting ear 2 to weaken. The setting of the groove 23 can disconnect part of the magnetic circuit formed by the distance between the hole wall of the mounting hole 21 and the outer wall of the stator sheet body 1, so as to further improve the blocking effect.

[0054] In one embodiment, the groove 23 passes through the connecting ear 2 along the axial direction of the stator punching sheet to reduce the outer diameter of the stator punching sheet at the connecting ear 2. The groove 23 has a third opening passing through the hole wall of the mounting hole 21, and the width of the third opening is smaller than the diameter of the mounting hole 21.

[0055] Since the width of the third opening is smaller than the diameter of the mounting hole 21, the rod of the bolt installed in the mounting hole 21 cannot escape from the mounting hole 21 through the third opening, so that the mounting hole 21 still maintains the function of a fully enclosed hole to limit the radial position of the rod of the bolt, so as to facilitate the normal use of the bolt installed in the mounting hole 21.

[0056] It should be noted that it is not necessary for the width of the third openings on all stator punchings to be greater than the diameter of the mounting hole 21. Normal use of the bolts can be ensured as long as the width of the third openings on at least one of the multiple stator punchings, or the two stator punchings at the ends, is greater than the diameter of the mounting hole 21.

[0057] In other embodiments, the width of the third openings on all stator punching sheets may be greater than the diameter of the mounting hole 21 . To prevent the bolts from detaching from the mounting hole 21 through the third openings, several non-opening steel plates may be added to the end faces of the connecting ears 2 .

[0058] In one embodiment, if Figure 2 As shown, the width L3 of the third opening is (1 / 4 to 1 / 3) d, where d is the diameter of the mounting hole 21 . The connecting ear 2 within this value range of the width of the third opening can balance the blocking effect and the structural strength of the connecting ear 2 .

[0059] In one embodiment, on a plane parallel to the axial end surface of the stator sheet body 1 , the shape of the mounting hole 21 is symmetrical, the shape of the groove 23 is symmetrical, and the symmetry line of the mounting hole 21 and the symmetry line of the groove 23 are on the same straight line.

[0060] In one embodiment, the bottom wall of the groove 23 is tangent to the annular surface where the outer wall of the stator punching body 1 is located, so that the outer diameter of the stator punching at the hole wall of the mounting hole 21 does not increase, avoiding the uneven magnetic field caused by the increase in the outer diameter of the connecting ear 2.

[0061] In one embodiment, the groove 23 has a first side wall and a second side wall opposite to each other in the circumferential direction of the stator punching sheet, the first side wall is connected between one side of the bottom wall of the groove 23 and the hole wall of the mounting hole 21, and the second side wall is connected between the other side of the bottom wall of the groove 23 and the hole wall of the mounting hole 21.

[0062] In one embodiment, the first side wall and the second side wall are parallel to each other and perpendicular to the bottom wall of the groove 23. The structure of the groove 23 is simple and easy to process.

[0063] In one embodiment, the first side wall and the bottom wall of the groove 23 have an arc transition, and the second side wall and the bottom wall of the groove 23 have a smooth transition.

[0064] The first side wall and the hole wall of the mounting hole 21 are in smooth transition, and the second side wall and the hole wall of the mounting hole 21 are in smooth transition.

[0065] In one embodiment, the stator punching body 1 is in a circular ring shape;

[0066] The width of the connecting ear 2 gradually decreases in the direction away from the stator sheet body 1 .

[0067] In other embodiments, the through hole 22 may be a blind hole, and the depth of the through hole 22 in the axial direction of the stator punching sheet is smaller than the thickness of the connecting ear 2 .

[0068] In other embodiments, the through opening 22 may extend toward the radial outer side of the stator sheet to a preset position, and the preset position is at a certain distance from the outer wall of the connecting ear 2 .

[0069] In other embodiments, the through opening 22 may be located at any position on the circumference of the mounting hole 21 .

[0070] In other embodiments, the cross-sectional shape of the through opening 22 may be asymmetrical, for example, a right-angled trapezoid.

[0071] In other embodiments, the width of the second opening 222 may be equal to the width of the first opening 221 .

[0072] In other embodiments, the width of the through opening 22 may first increase and then decrease from the first opening 221 to the second opening 222 .

[0073] In other embodiments, the axial depth of the groove 23 of the stator punching sheet may be smaller than the thickness of the connecting ear 2 .

[0074] In other embodiments, the cross-sectional shape of the groove 23 may be asymmetrical, for example, a right-angled trapezoid or an irregular shape.

[0075] In other embodiments, the bottom wall of the groove 23 may be an arc-shaped shape that matches the annular surface where the outer wall of the stator punch body 1 is located.

[0076] In other embodiments, the groove 23 may be semicircular and have only arc-shaped walls.

[0077] In other embodiments, the width of the groove 23 gradually increases in a direction away from the mounting hole 21 .

[0078] In addition, an embodiment of the utility model provides a stator core, comprising a plurality of stator punching sheets of the above-mentioned embodiments, wherein the plurality of stator punching sheets are stacked together, the connecting ears 2 of the plurality of stator punching sheets are aligned correspondingly, the rod of the bolt passes through the connecting hole on the corresponding connecting ear 2 and is fastened by a nut to fix all the stator punching sheets together to form a stator core.

[0079] In addition, an embodiment of the present invention provides a motor, comprising the stator core of the above embodiment.

[0080] In addition, an embodiment of the present invention provides a power assembly, including the motor of the above embodiment.

[0081] In addition, an embodiment of the present invention provides a vehicle, comprising the motor or powertrain of the above embodiment.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: The invention comprises a stator punch body (1) and a connecting ear (2) connected to the outer peripheral surface of the stator punch body (1); the connecting ear (2) is provided with a mounting hole (21) and a through-hole (22); the mounting hole (21) penetrates the connecting ear (2) along the axial direction of the stator punch; the through-hole (22) is communicated with the mounting hole (21) and extends toward the radial outside of the mounting hole (21).

2. The stator sheet according to claim 1, characterized in that: The through-hole (22) penetrates the connecting ear (2) along the axial direction of the stator punching sheet.

3. The stator sheet according to claim 1, characterized in that: The through opening (22) penetrates the connecting ear (2) toward the radial outer side of the mounting hole (21).

4. The stator sheet according to claim 3, characterized in that: The through opening (22) comprises a first opening (221) penetrating the hole wall of the mounting hole (21) and a second opening (222) penetrating the outer wall of the connecting ear (2); the width of the first opening (221) is smaller than the diameter of the mounting hole (21).

5. The stator sheet according to claim 4, characterized in that: The width of the second opening (222) is greater than the width of the first opening (221).

6. The stator sheet according to claim 5, characterized in that: The width of the through opening (22) gradually increases from the inside to the outside in the radial direction of the stator punching sheet.

7. The stator sheet according to claim 4, characterized in that: The width L1 of the first opening (221) is (1 / 3 to 1 / 2) d, where d is the diameter of the mounting hole (21).

8. The stator sheet according to claim 4, characterized in that: The width L2 of the second opening (222) is (1.1-1.3) d, where d is the diameter of the mounting hole (21).

9. The stator sheet according to claim 1, characterized in that: The through opening (22) is located on a radial side of the mounting hole (21) away from the stator punch body (1).

10. The stator sheet according to claim 9, characterized in that: On a plane parallel to the axial end face of the stator punch body (1), the shape of the mounting hole (21) is symmetrical, the shape of the through opening (22) is symmetrical, and the symmetry line of the mounting hole (21) and the symmetry line of the through opening (22) are on the same straight line.

11. The stator sheet according to claim 1, characterized in that: The connecting ear (2) is also provided with a groove (23) communicating with the mounting hole (21), and the groove (23) is located on a radial side of the mounting hole (21) close to the stator punch body (1).

12. The stator sheet according to claim 11, characterized in that: The groove (23) penetrates the connecting ear (2) along the axial direction of the stator punching sheet, and the groove (23) has a third opening that penetrates the hole wall of the mounting hole (21), and the width of the third opening is smaller than the diameter of the mounting hole (21).

13. The stator sheet according to claim 12, characterized in that: The width L3 of the third opening is (1 / 4 to 1 / 3) d, where d is the diameter of the mounting hole (21).

14. The stator sheet according to claim 11, characterized in that: On a plane parallel to the axial end face of the stator punch body (1), the shape of the mounting hole (21) is symmetrical, the shape of the groove (23) is symmetrical, and the symmetry line of the mounting hole (21) and the symmetry line of the groove (23) are on the same straight line.

15. The stator sheet according to claim 11, characterized in that: The bottom wall of the groove (23) is tangent to the annular surface where the outer wall of the stator punch body (1) is located.

16. The stator sheet according to claim 11, characterized in that: The groove (23) has a first side wall and a second side wall which are opposite to each other in the circumferential direction of the stator punching sheet, the first side wall being connected between one side of the bottom wall of the groove (23) and the hole wall of the mounting hole (21), and the second side wall being connected between the other side of the bottom wall of the groove (23) and the hole wall of the mounting hole (21).

17. The stator sheet according to claim 16, characterized in that: The first side wall and the second side wall are parallel to each other and perpendicular to the bottom wall of the groove (23).

18. The stator sheet according to claim 16, characterized in that: The first side wall and the bottom wall of the groove (23) are in smooth transition, and the second side wall and the bottom wall of the groove (23) are in smooth transition; The first side wall smoothly transitions to the hole wall of the mounting hole (21), and the second side wall smoothly transitions to the hole wall of the mounting hole (21).

19. A stator core, characterized in that: The invention comprises a plurality of stator sheets according to any one of claims 1 to 18.

20. A motor, characterized in that: Comprising the stator core as claimed in claim 19.

21. A powertrain, characterized in that: Includes the motor as claimed in claim 20.

22. A vehicle, characterized in that: Includes the motor according to claim 20 or the powertrain according to claim 21.

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