Stator core, stator, motor and compressor

Abstract

The application discloses a kind of stator core, stator, motor and compressor, it is related to motor technical field, wherein, stator core includes multiple laminated punching sheet, the outer circle of each punching sheet is equipped with multiple cutting edge, multiple cutting edge is equipped with a pair of riveting slot, multiple cutting edge is also equipped with welding site, multiple punching sheet is welded together by welding site;Two the pair of riveting slot is respectively arranged in the opposite side of stator core, the center of groove bottom of two the pair of riveting slot is respectively connected with the center of circle of stator core and is recorded as AO and BO, the included angle of AO and BO is θ1, θ1 satisfies 120 ° < θ1 ≤ 180 °.The technical scheme provided by the application can guarantee that stator core does not scatter piece and improves the manufacturing yield of motor at the same time, reduces the eddy current loss generated due to rivet, to improve motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator core, a stator, a motor, and a compressor. Background Technology

[0002] The refrigeration industry has increasingly higher requirements for energy efficiency, and changes in motor efficiency directly affect compressor efficiency.

[0003] An electric motor consists of two main components: a stator and a rotor. The stator core is composed of multiple stator laminations. In related technologies, the stator core is generally formed by stacking and fixing multiple laminations axially through rivet points. Although this rivet can ensure that the stator core does not break apart, it will increase interlayer eddy currents, thereby reducing the efficiency of the motor. Summary of the Invention

[0004] The main objective of this invention is to provide a stator core, stator, motor, and compressor that aims to ensure the stator core does not break apart while reducing eddy current losses caused by rivets.

[0005] To achieve the above objectives, the stator core proposed in this invention comprises:

[0006] Multiple laminations are stacked together. Each lamination has multiple tangled edges on its outer circumference. Each tangled edge has a pair of riveting grooves and welding positions. The multiple laminations are welded together through the welding positions. Two riveting grooves are respectively located on opposite sides of the stator core. The lines connecting the center of the bottom of the two riveting grooves to the center of the stator core are denoted as AO and BO, respectively. The included angle between AO and BO is θ1, and θ1 satisfies 120°<θ1≤180°.

[0007] In one embodiment, θ1 satisfies 130°<θ1≤180°.

[0008] In one embodiment, the number of welding positions is X1, satisfying: 3≤X1≤9.

[0009] In one embodiment, the lamination includes a plurality of spaced stator teeth, and the distance L1 from the welding position to the center line of the stator tooth corresponding to the cut edge satisfies L1 > 1 mm.

[0010] In one embodiment, the number of stator teeth X2 satisfies: 6≤X2≤15.

[0011] In one embodiment, the two groove walls of the riveting groove, which are arranged opposite each other in the circumferential direction, have an included angle of θ2 in the radial direction, satisfying 0°<θ2≤60°.

[0012] In one embodiment, the distance from the center point of the bottom of the riveting groove to the outer circumference of the stator core is L2, which satisfies L2 > 1 mm.

[0013] In one embodiment, the number of riveting slots is X3, satisfying: 2≤X3≤6.

[0014] In one embodiment, the maximum depth of the riveting groove is H, which satisfies the following condition: 0.5mm < H < 4mm.

[0015] In one embodiment, the bottom of the riveting groove is flat or curved.

[0016] In one embodiment, the lamination is provided with a stator slot, the minimum distance from the cut edge to the bottom of the stator slot is L3, and the minimum distance from the outer circumference of the stator core to the bottom of the stator slot is L4, satisfying: 0.65×L3<L3<1.1×L4.

[0017] The present invention also proposes a stator, characterized in that it includes the stator core described above.

[0018] The present invention also proposes an electric motor, characterized in that it includes the stator described above.

[0019] The present invention also proposes a compressor, characterized in that it includes the aforementioned motor.

[0020] The technical solution of this invention involves setting a pair of riveting grooves on the tangential edge of the laminations. These grooves accommodate auxiliary riveting components with rivets, which match the grooves to pre-fix multiple laminations. Then, the laminations are welded together at welding points on the tangential edge, ensuring the stator core does not detach. The auxiliary riveting components are then removed from the grooves, leaving the assembled stator core without rivets. This avoids interlayer eddy currents caused by rivet points, reducing eddy current losses in the stator core and improving motor efficiency. Furthermore, this solution limits the angle θ1 between the center of the bottom of the two riveting grooves and the center of the stator core to between 120° and 180°, further reducing the probability of the stator core laminations becoming loose. If θ1 < 120°, then θ1 is too small, which can easily cause the stator core laminations to become loose. Moreover, the value of θ1 is also related to the manufacturing yield of the motor. Limiting θ1 to between 120° and 180° can help improve the manufacturing yield of the motor. It can be seen that this technical solution can ensure that the stator core does not break apart and improve the manufacturing yield of the motor, while reducing the eddy current loss caused by the rivets, thereby improving the motor efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the first embodiment of the stator core provided by the present invention;

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of the second embodiment of the stator core provided by the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the third embodiment of the stator core provided by the present invention;

[0026] Figure 5 A comparison chart showing the efficiency of conventional motors using existing technology and motors using the stator core of this solution;

[0027] Figure 6 This diagram illustrates the relationship between the manufacturing yield of a motor using the stator core of this design and θ1.

[0028] Explanation of icon numbers:

[0029] 10. Stator core; 100. Lamination; 110. Cut edge; 120. Riveting groove; 130. Welding position; 200. Stator tooth; 210. Center line; 300. Outer circumference; 400. Stator slot.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0034] The refrigeration industry has increasingly higher requirements for energy efficiency, and changes in motor efficiency directly affect compressor efficiency.

[0035] An electric motor consists of two main components: a stator and a rotor. The stator core is composed of multiple stator laminations. In related technologies, the stator core is generally formed by stacking and fixing multiple laminations axially through rivet points. Although this rivet can ensure that the stator core does not break apart, it will increase interlayer eddy currents, thereby reducing the efficiency of the motor.

[0036] To address the aforementioned problems, this invention proposes a stator core 10.

[0037] Please see Figures 1 to 4 In one embodiment of the present invention, the stator core 10 includes a plurality of stacked laminations 100. Each lamination 100 has a plurality of tangent edges 110 on its outer circumference 300. Each tangent edge 110 has a pair of riveting grooves 120 and a welding position 130. The plurality of laminations 100 are welded together through the welding position 130. The two riveting grooves 120 are respectively disposed on opposite sides of the stator core 10. The lines connecting the center of the bottom of the two riveting grooves 120 to the center of the stator core 10 are denoted as AO and BO, respectively. The included angle between AO and BO is θ1, and θ1 satisfies 120°<θ1≤180°.

[0038] The technical solution of the present invention provides a pair of riveting grooves 120 on the cut edge 110 of the outer circumference 300 of the lamination 100. The riveting grooves 120 are used for setting auxiliary riveting parts with rivets. The auxiliary riveting parts match the riveting grooves 120 to pre-fix multiple laminations 100 in advance. Then, the multiple laminations 100 are welded together by the welding position 130 on the cut edge 110, thereby ensuring that the stator core 10 does not fall apart. After that, the auxiliary riveting parts are removed from the riveting grooves 120, so that there are no rivets on the assembled stator core 10. This can avoid interlayer eddy currents caused by rivet points, that is, reduce the eddy current loss of the stator core 10, and thus improve the efficiency of the motor.

[0039] It should be noted that "multiple" in this solution refers to two or more, such as two, four, seven, eleven, etc. Secondly, a pair of riveting grooves 120 are provided on the cut edge 110 of the outer circumference 300 of the stamping 100. This can be understood as at least one pair of riveting grooves 120 being provided on the cut edge 110 of the outer circumference 300 of the stamping 100. However, the understanding of "a pair of riveting grooves 120" does not mean that all the riveting grooves 120 on the outer circumference 300 of the stamping 100 are provided in pairs. One riveting groove 120 can also be paired with two other riveting grooves.

[0040] Reference Figure 6 , Figure 6 A comparison chart of the efficiency of conventional motors using existing technology and motors using the stator core 10 of this solution is provided for reference. Figure 6 It can be seen that the motor efficiency of the stator core 10 using this patented technology is greater than that of the motor using traditional technology.

[0041] Secondly, this solution limits the angle θ1 between the center of the bottom of the two riveting grooves 120 and the center of the stator core 10 to a range greater than 120° and less than or equal to 180°. This reduces the probability of the stator core 10 laminations 100 becoming loose. If θ1 < 120°, then θ1 is too small, which can easily cause the core laminations 100 to become loose. Moreover, the value of θ1 is also related to the manufacturing yield of the motor. Limiting θ1 to a range greater than 120° and less than or equal to 180° is beneficial to improving the manufacturing yield of the motor. Therefore, this technical solution can ensure that the stator core 10 does not break apart and improve the manufacturing yield of the motor, while reducing eddy current losses caused by riveting, thereby improving motor efficiency.

[0042] Reference Figure 5 , Figure 5 A diagram illustrating the relationship between motor manufacturing yield and 5; see reference. Figure 5 It can be seen that as θ1 increases, the manufacturing yield of the motor also increases continuously. When θ1 is greater than 120°, the manufacturing yield of the motor is greater than 99.2%.

[0043] It is understandable that the outer circumference 300 of the lamination 100 is provided with multiple chamfered edges 110. The multiple chamfered edges 110 improve the oil return capacity of the compressor. On the other hand, it can save materials as a whole. After the stator core 10 is assembled, the chamfered edges 110 can form a better heat dissipation gap between the stator core 10 and the motor housing, improve heat dissipation performance, and reduce the consumption of steel plates.

[0044] It should be noted that, in this scheme, the cut edge 110 refers to the edge of the part of the outer circumference 300 of the stamping 100 that is cut off, that is, the missing part of the outer circumference 300 of the stamping 100.

[0045] Optionally, the number of cutting edges 110 can be 6, 8, 9, 10 or 12, and no specific number of cutting edges 110 is limited here.

[0046] It should be noted that the auxiliary riveting part and the stamp 100 are integrally formed. That is, when the stamp 100 is formed, the auxiliary riveting part is formed on the riveting groove 120 at the same time, which can reduce processing efficiency. Of course, this solution is not limited to this. In other embodiments, the auxiliary riveting part can also be installed into the riveting groove 120 after the stamp 100 is formed.

[0047] Reference Figures 1 to 4 Furthermore, in this embodiment, at least a portion of the cut edge 110 is provided with a riveting groove 120, and at least a portion of the cut edge 110 is provided with a welding position 130. The same cut edge 110 may be provided with both a riveting groove 120 and a welding position 130, or the same cut edge 110 may be provided with only a riveting groove 120 or a welding position 130.

[0048] Furthermore, in this embodiment, to further improve the oil return of the compressor, a radially inward oil return groove is also provided on the outer circumference 300 of the lamination 100. It can be understood that the oil return groove can increase the oil return efficiency, thereby further improving the oil return of the compressor.

[0049] In this embodiment, the oil return groove is provided on the cut edge 110. Of course, this solution is not limited to this, and the oil return groove may not be provided on the cut edge 110.

[0050] Furthermore, in this embodiment, θ1 satisfies 130°<θ1≤180°, which can further improve the manufacturing yield of the motor. (Refer to...) Figure 5 It can be seen that when θ1 is between 130° and 180°, the manufacturing yield of the motor is greater than 99.5% but less than 100%.

[0051] Furthermore, θ1 satisfies 150°<θ1≤180°, which can further improve the manufacturing yield of the motor.

[0052] In one embodiment, the number of welding positions 130 is X1, satisfying: 3 ≤ X1 ≤ 9. It is understood that if the number of welding positions 130 is too small, the stator core 10 will be poorly secured, easily leading to stator core 10 breakage. If the number of welding positions 130 is too large, it will increase the engineering difficulty. This solution limits the number of welding positions 130 X1 to 3 to 9, thus ensuring engineering difficulty while reducing the probability of stator core 10 breakage.

[0053] In one embodiment, the lamination 100 includes a plurality of spaced stator teeth 200. The distance L1 from the welding position 130 to the center line 210 of the stator tooth 200 corresponding to the cut edge 110 satisfies L1 > 1 mm. It can be understood that if L1 is less than 1 mm, the welding position 130 is too close to the center region of the stator tooth 200. Welding in this region will cause deformation of the stator core 10, leading to vibration and noise problems. This solution ensures that the distance L1 from the welding position 130 to the center line 210 of the stator tooth 200 corresponding to the cut edge 110 is greater than 1 mm. This reduces the probability of stator core 10 deformation, thereby reducing motor vibration and noise.

[0054] It should be noted that the point of welding position 130 closest to the corresponding center line 210 is the first starting point. A perpendicular line is drawn from this first starting point to the center line 210; the intersection of this perpendicular line and the center line 210 is the first ending point. The distance between the first starting point and the first ending point is the minimum distance x1 between welding position 130 and the center line 210. The point of welding position 130 furthest from the corresponding center line 210 is the second starting point. A perpendicular line is drawn from this second starting point to the center line 210; the intersection of this perpendicular line and the center line 210 is the second ending point. The distance between the second starting point and the second ending point is the maximum distance x2 between welding position 130 and the center line 210. L1 represents the average of the minimum distance x1 between welding position 130 and the center line 210 and the maximum distance x2 between welding position 130 and the center line 210.

[0055] Optionally, in this embodiment, the number of stator teeth 200 X2 satisfies: 6≤X2≤15. At this time, the number of stator slots 400 can be 6, 9, 12, or 15 slots. This type of stator core 10 can better match 120°<θ1≤180°, thereby further reducing the eddy currents of the stator core 10.

[0056] Optionally, the distance between the two groove walls of the riveting groove 120 arranged opposite each other in the circumferential direction gradually decreases in the direction close to the center of the stator core 10. This allows the auxiliary riveting part to better cooperate with the riveting groove 120 and increases the stability of the auxiliary riveting part.

[0057] Alternatively, in order to make the auxiliary riveting part and the riveting groove 120 more closely contact each other, the included angle between the two groove walls of the riveting groove 120 arranged opposite each other in the circumferential direction in the radial direction is θ2, which satisfies 0°<θ2≤60°.

[0058] Furthermore, in one embodiment, θ2 satisfies 20°<θ2≤60°, which further enables the auxiliary riveting part to make closer contact with the riveting groove 120.

[0059] In one embodiment, the distance from the center point of the bottom of the riveting groove 120 to the outer circumference 300 of the stator core 10 is L2, which satisfies L2 > 1mm, thus ensuring that the riveting groove 120 and the auxiliary riveting parts are fully engaged.

[0060] It should be noted that the center point of the bottom of the riveting groove 120 is taken as the third starting point. A perpendicular line is drawn from the third starting point to the outer circumference 300 of the stator core 10. The intersection of this perpendicular line and the outer circumference 300 of the stator core 10 is the third ending point. L2 represents the distance between the third starting point and the third ending point.

[0061] In one embodiment, the number of riveting slots 120 is X3, satisfying: 2 ≤ X3 ≤ 6. It can be understood that if the number of riveting slots 120 is less than 2, the auxiliary riveting component cannot provide support for multiple punch pieces 100. If the number of riveting slots 120 is greater than 6, the engineering difficulty increases. This solution limits the number of riveting slots 120 (X3) to between 2 and 6, which is beneficial for the auxiliary riveting component to provide stable support for multiple punch pieces 100 while ensuring the engineering difficulty is controlled.

[0062] In one embodiment, the maximum depth of the riveting groove 120 is H, satisfying the condition: 0.5mm < H < 4mm. It is understood that if the maximum depth H of the riveting groove 120 is greater than or equal to 4mm, the groove would be too deep, excessively increasing the bonding force between the auxiliary riveting component and the groove 120, making disassembly difficult and increasing engineering complexity. This solution limits the maximum depth H of the riveting groove 120 to 0.5mm < H < 4mm, which helps reduce the bonding force between the auxiliary riveting component and the groove 120, facilitating the removal of the auxiliary riveting component after welding multiple stamping pieces 100 together, thereby reducing engineering complexity.

[0063] It should be noted that the point at the bottom of the riveting groove 120 closest to the center of the stator core 10 is taken as the fourth starting point. A perpendicular line is drawn from the fourth starting point to the groove opening plane of the riveting groove 120. The intersection of this perpendicular line and the groove opening plane of the riveting groove 120 is the fourth ending point. H represents the distance from the fourth starting point to the fourth ending point.

[0064] In one embodiment, the bottom of the riveting groove 120 is a flat or curved surface.

[0065] In this embodiment, the groove walls of the rivet groove 120 distributed circumferentially are planar, and the bottom of the rivet groove 120 is planar. In the second embodiment, the groove walls of the rivet groove 120 distributed circumferentially are planar, and the bottom of the rivet groove 120 is arc-shaped.

[0066] In one embodiment, the lamination 100 is provided with a stator slot 400. The minimum distance from the cut edge 110 to the bottom of the stator slot 400 is L3, and the minimum distance from the outer circumference 300 of the stator core 10 to the bottom of the stator slot 400 is L4, satisfying: 0.65×L4<L3<1.1×L4. It can be understood that the distance from the center of the bottom of the stator slot 400 to the outer circumference of the stator core 10 cannot be too small. If it is too small, the strength of the stator core 10 will be too poor, causing vibration and noise problems in the compressor. If the distance from the center of the bottom of the stator slot 400 to the outer circumference of the stator core 10 is too large, the bonding force between the riveting groove 120 and the auxiliary riveting parts will be weak, and multiple laminations 100 will easily loosen during pre-fixation. This scheme ensures that L4 satisfies 0.65×L4<L3<1.1×L4, thereby improving the strength of the stator core 10 while guaranteeing the bonding force between the riveting groove 120 and the auxiliary riveting parts, thus reducing the vibration and noise of the compressor.

[0067] It should be noted that the fifth starting point is the point on the bottom of the stator slot 400 closest to the outer circumference of the stator core 10. A perpendicular line is drawn from the fifth starting point to the tangent edge corresponding to the stator slot 400. The intersection of this perpendicular line and the tangent edge is the fifth ending point. L3 represents the distance from the fifth starting point to the fifth ending point. The sixth starting point is the point on the bottom of the stator slot 400 closest to the outer circumference of the stator core 10. A perpendicular line is drawn from the sixth starting point to the outer circumference circle 300 of the stator core 10. The intersection of this perpendicular line and the outer circumference circle 300 is the sixth ending point. L4 represents the distance from the sixth starting point to the sixth ending point.

[0068] It should be noted that the minimum distance from the cut edge 110 to the bottom of the stator slot 400 is L3, and the minimum distance from the outer circumference 300 of the stator core 10 to the bottom of the stator slot 400 is L4. The bottom of the stator slot 400 refers to the center of the bottom of the stator slot 400.

[0069] The present invention also proposes a stator, which includes a stator core. The specific structure of the stator core is as described in the above embodiments. Since the stator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] The present invention also proposes an electric motor, which includes a stator. The specific structure of the stator is as described in the above embodiments. Since the present motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0071] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0072] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator core, characterized in that, include: Multiple laminations are stacked together. Each lamination has multiple tangled edges on its outer circumference. Each tangled edge has a pair of riveting grooves and welding positions. The multiple laminations are welded together through the welding positions. Two riveting grooves are respectively located on opposite sides of the stator core. The lines connecting the center of the bottom of the two riveting grooves to the center of the stator core are denoted as AO and BO, respectively. The included angle between AO and BO is θ1, and θ1 satisfies 120°<θ1≤180°.

2. The stator core as described in claim 1, characterized in that, The θ1 satisfies 130°<θ1≤180°.

3. The stator core as described in claim 1, characterized in that, The number of welding positions is X1, which satisfies: 3≤X1≤9.

4. The stator core as described in claim 3, characterized in that, The lamination includes a plurality of spaced stator teeth, and the distance L1 from the welding position to the center line of the stator tooth corresponding to the cut edge satisfies L1 > 1 mm.

5. The stator core as described in claim 4, characterized in that, The number of stator teeth, X2, satisfies: 6 ≤ X2 ≤ 15.

6. The stator core as described in claim 1, characterized in that, The two groove walls of the riveting groove, which are arranged opposite each other in the circumferential direction, have an included angle θ2 in the radial direction, which satisfies 0°<θ2≤60°.

7. The stator core as described in claim 6, characterized in that, The distance from the center point of the bottom of the riveting groove to the outer circumference of the stator core is L2, which satisfies L2 > 1mm.

8. The stator core as described in claim 1, characterized in that, The number of riveting slots is X3, satisfying: 2≤X3≤6.

9. The stator core as described in claim 1, characterized in that, The maximum depth of the rivet groove is H, which satisfies the following condition: 0.5mm < H < 4mm.

10. The stator core as described in claim 1, characterized in that, The bottom of the riveting groove is either flat or curved.

11. The stator core as described in any one of claims 1 to 10, characterized in that, The lamination is provided with a stator slot, the minimum distance from the cut edge to the bottom of the stator slot is L3, and the minimum distance from the outer circumference of the stator core to the bottom of the stator slot is L4, satisfying: 0.65×L4<L3<1.1×L4.

12. A stator, characterized in that, Includes the stator core as described in any one of claims 1 to 11.

13. An electric motor, characterized in that, Includes the stator as described in claim 12.

14. A compressor, characterized in that, Including the motor as described in claim 13.

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