Stator core

Abstract

The utility model discloses a stator core, which comprises a stator punching sheet, the stator punching sheet comprises at least two split punching sheets, and the at least two split punching sheets are sequentially connected end to end to form the stator punching sheet; the plurality of stator punching sheets are laminated up and down to form a stator core, gaps between adjacent layers of stator punching sheets are arranged in a staggered manner, and the gaps are gaps between adjacent split punching sheets. Compared with a complete iron core punching sheet, the split type structure can effectively reduce material waste through scientific arrangement and reasonable suit cutting arrangement. And meanwhile, the split structure improves the utilization rate of materials by reducing the waste of the middle silicon steel wafer. That is to say, the silicon steel sheets are processed into a plurality of split punching sheets, so that the utilization rate of the silicon steel sheets is improved, and waste of corners and central parts of the silicon steel sheets is avoided. Moreover, the stator punching sheets of adjacent layers are limited to be arranged in a staggered manner at intervals, and the overall strength of the stator iron core can be improved through the staggered lamination mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stator core technical field especially relates to a stator core. BACKGROUND

[0002] The technological process that silicon steel sheet is processed into core punching piece is as follows: cutting: firstly, the silicon steel sheet is cut into a certain width strip on the cutting bed, and then the strip is cut into a circle or other required shape according to the design requirement. Punching: the cut silicon steel sheet is sent into a punch, and the silicon steel sheet is punched into the embedded wire slot shape of a stator or a rotor through a punching die, and the inner circle part is removed to form a punching piece. Laminating: the punched silicon steel sheet is laminated according to the design requirement to form a stator or rotor core. The silicon steel sheet may need to be rotated during the laminating process to eliminate thickness error and ensure the uniformity of the core height. Surface treatment: the laminated core is subjected to surface treatment, such as paint dipping, phosphorization, zinc plating, etc., to improve its insulation performance, magnetic permeability and corrosion resistance. Curing: the coating is fully cured and the overall stability of the core is improved by using hot pressing or step heating curing method. Quality detection: finally, the core is subjected to quality detection to ensure that it meets the design requirements.

[0003] It can be known from the above technological process that there is waste of the edge and center part of the silicon steel sheet during the cutting process. The silicon steel sheet produces edge and corner scraps during the cutting and punching process, and if these edge and corner scraps are not collected, it will cause great waste and affect the utilization rate of the silicon steel sheet. SUMMARY

[0004] The embodiment of the utility model provides a kind of stator core, which can improve the utilization rate of silicon steel sheet and avoid the waste of edge and center part of silicon steel sheet.

[0005] To solve the above problems, according to one aspect of the present application, the embodiment of the utility model provides a kind of stator core, the stator core includes stator punching piece, the stator punching piece includes at least two split type punching pieces, at least two the split type punching piece head-to-tail sequentially connected to form the stator punching piece;Multiple stator punching pieces are stacked to form the stator core, and the gap of the adjacent layer of the stator punching piece is staggered, wherein the gap is the gap between the adjacent split type punching pieces.

[0006] In some embodiments, the first end of the split type punching piece has a first connecting piece, the second end of the split type punching piece has a second connecting piece, the first connecting piece of the first end of the split type punching piece matches the second connecting piece of the second end of the split type punching piece adjacent thereto, and the second connecting piece of the second end of the split type punching piece matches the first connecting piece of the first end of the split type punching piece adjacent thereto.

[0007] In some embodiments, the first connecting piece is a dovetail groove formed in the first end of the split stamping piece; the second connecting piece is a dovetail latch provided at the second end of the split stamping piece; the dovetail latch matches the dovetail groove.

[0008] In some embodiments, the first end of the split stamping piece has a first welding groove, the second end of the split stamping piece has a second welding groove, the first welding groove of the first end of the split stamping piece and the second welding groove of the second end of the split stamping piece adjacent thereto can be combined into a welding groove, and the second welding groove of the second end of the split stamping piece and the first welding groove of the first end of the split stamping piece adjacent thereto can also be combined into a welding groove.

[0009] In some embodiments, the first welding groove is a first arc structure, the second welding groove is a second arc structure, and the first arc structure and the second arc structure can be combined into a complete circle.

[0010] In some embodiments, the split stamping piece comprises a yoke and a plurality of stator teeth, the yoke is arc-shaped, and the plurality of stator teeth are uniformly arranged along the inner circle of the yoke.

[0011] In some embodiments, the arc angle θ of the yoke is 360 / n, where n is the number of the split stamping pieces.

[0012] In some embodiments, a key groove is formed on the outer side of the split stamping piece.

[0013] In some embodiments, a rivet hole is formed on the split stamping piece.

[0014] In some embodiments, the stator core further comprises a rivet, the rivet passes through the rivet holes on the plurality of stator stamping pieces to fix the plurality of stator stamping pieces.

[0015] Compared with the prior art, the stator core has at least the following beneficial effects:

[0016] The stator core provided by the utility model discloses a stator stamping piece, the stator stamping piece comprises at least two split stamping pieces, and the at least two split stamping pieces are sequentially connected in a head-tail mode to form the stator stamping piece.

[0017] The utility model discloses a split type punching piece, compared with the complete core punching piece, split type punching piece can better utilize silicon steel sheet. Specifically: split type punching piece is through the integral punching piece is changed into several same size split punching piece, can reduce the size of punching piece mould, thereby reduces mould cost, processing cycle and difficulty, promotes material utilization. The traditional annular silicon steel sheet is wasted a large amount of material when cutting forming, and split type structure passes through scientific discharging and reasonable cover cutting and arranging sample, can effectively reduce material waste. The stamping force of split type punching piece drops greatly, can adopt small tonnage high -speed punch batch production, thereby improves production efficiency. And, split type structure reduces the waste of intermediate silicon steel disc, improves the utilization of material. That is to say, the utility model discloses a silicon steel sheet is processed into a plurality of split type punching pieces, and the plurality of split type punching pieces are sequentially connected to form a complete stator punching piece, improve the utilization of silicon steel sheet, avoid the waste of silicon steel sheet edge angle and center part.

[0018] In addition, the utility model limits that the stator punching piece is stacked to form the stator core, and the gap of the adjacent layer of stator punching piece is staggered, which can increase the overall strength of the stator core.

[0019] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail below. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 It is a structure schematic view of split type punching piece in the stator core provided by the embodiment of the utility model;

[0022] Figure 2 It is a structure schematic view of stator punching piece in the stator core provided by the embodiment of the utility model;

[0023] Figure 3 It is Figure 2 The local enlarged view of A in the figure;

[0024] Figure 4 It is another structure schematic view of split type punching piece in the stator core provided by the embodiment of the utility model;

[0025] Figure 5is a structure schematic view of a stator core provided by an embodiment of the utility model;

[0026] Figure 6 is Figure 5 The local enlarged view at B in the middle part;

[0027] Reference signs:

[0028] 1, split type punching sheet;11, yoke part;12, stator tooth;13, key groove;14, rivet hole;2, first connecting piece;3, second connecting piece;4, first welding groove;5, second welding groove;6, rivet. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the following will be combined with the drawings and the preferred embodiments, and the specific embodiments, structures, features and effects according to the utility model application will be described in detail as follows.In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment.In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0030] In the description of the utility model, it is necessary to make clear that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence;The terms "vertical", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model, and do not mean that the device or element referred to must have a specific orientation or position, so it cannot be understood as a limitation on the utility model.

[0031] In the description of the utility model, it is necessary to make clear that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium.The above-mentioned terms in the utility model can be understood according to the specific meaning of the above-mentioned terms in the utility model.

[0032] Generally, silicon steel sheets are processed into core punching sheets. Silicon steel sheets have a high resistivity, and processing the core into a sheet shape can effectively reduce eddy current loss, thereby improving the efficiency of the motor and transformer. At the same time, the hysteresis loss and eddy current loss of the silicon steel sheet are small, and the core stacked with the silicon steel sheet can significantly reduce the iron loss and reduce the heat generation of the equipment. In addition, the silicon steel sheet has high permeability and can provide greater magnetic flux, thereby improving the output power and efficiency of the equipment.

[0033] However, there is waste when the silicon steel sheet is processed into a core punching sheet. For example, during the cutting and stamping process, due to the size and shape limitations of the silicon steel sheet, corner scraps will be generated, resulting in low material utilization. In addition, in order to ensure the integrity of the outer circle of the punching sheet, a margin will usually be left during processing, which will increase the consumption of additional silicon steel sheets. During the blanking process, the silicon steel disc in the middle part cannot be effectively utilized, causing waste.

[0034] To solve this problem, the utility model adopts a split punching sheet, which can better utilize the silicon steel sheet compared to a complete core punching sheet.

[0035] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments in the specification.

[0036] The embodiment provides a stator core, which comprises a stator punching sheet, the stator punching sheet comprises at least two split punching sheets 1, and the at least two split punching sheets 1 are sequentially connected head to tail to form the stator punching sheet; a plurality of the stator punching sheets are stacked and pressed to form the stator core, and the gaps of the stator punching sheets of adjacent layers are arranged in a staggered manner, wherein the gap is the gap between adjacent split punching sheets 1.

[0037] The embodiment adopts a split punching sheet 1, which can better utilize the silicon steel sheet compared to a complete core punching sheet. Specifically, the split punching sheet 1 can reduce the size of the punching sheet mold by changing the whole punching sheet into a plurality of split punching sheets of the same size, thereby reducing the mold cost, processing period and difficulty, and improving the material utilization. A large amount of material is wasted when a traditional ring-shaped silicon steel sheet is cut and formed, and the split structure can effectively reduce material waste by scientific material arrangement and reasonable nesting and layout. The stamping force of the split punching sheet is greatly reduced, and small-tonnage high-speed presses can be used for batch production, thereby improving the production efficiency. In addition, the split structure reduces the waste of the middle silicon steel disc, thereby improving the material utilization. That is, the embodiment processes the silicon steel sheet into a plurality of split punching sheets 1, and the plurality of split punching sheets 1 are sequentially connected head to tail to form a complete stator punching sheet, thereby improving the utilization of the silicon steel sheet and avoiding the waste of the silicon steel sheet at the corners and the center.

[0038] In addition, the utility model limits that the stator core is formed by stacking the stator lamination sheet up and down, and the gap of the stator lamination sheet of adjacent layers is set in staggered mode, specifically, assuming that the stator lamination sheet includes eight split lamination sheets 1 in a certain embodiment, taking the first layer as the reference, the stator lamination sheet of the second layer needs to rotate a certain angle, such as 22.5 DEG, along the specified direction, so that the gap of the stator lamination sheet of adjacent layers is set in staggered mode, and the overall strength of the stator core can be increased through this staggered stacking mode.

[0039] In specific embodiments, the first end of the split lamination sheet 1 has a first connecting piece 2, the second end of the split lamination sheet 1 has a second connecting piece 3, the first connecting piece 2 of the first end of the split lamination sheet 1 matches the second connecting piece 3 of the second end of the split lamination sheet 1 adjacent thereto, and the second connecting piece 3 of the second end of the split lamination sheet 1 matches the first connecting piece 2 of the first end of the split lamination sheet 1 adjacent thereto.

[0040] In addition, a clearer explanation of adjacent split lamination sheets 1 is given, assuming that the split lamination sheet 1 has four in a certain embodiment, which are a first split lamination sheet, a second split lamination sheet, a third split lamination sheet and a fourth split lamination sheet; wherein the first end of the first split lamination sheet, the second split lamination sheet, the third split lamination sheet and the fourth split lamination sheet all have a first connecting piece 2, and the second end all has a second connecting piece 3; then when the first split lamination sheet, the second split lamination sheet, the third split lamination sheet and the fourth split lamination sheet are connected in sequence, the second connecting piece 3 of the first split lamination sheet is connected with the first connecting piece 2 of the second split lamination sheet, the second connecting piece 3 of the second split lamination sheet is connected with the first connecting piece 2 of the third split lamination sheet, the second connecting piece 3 of the third split lamination sheet is connected with the first connecting piece 2 of the fourth split lamination sheet, and the second connecting piece 3 of the fourth split lamination sheet is connected with the first connecting piece 2 of the first split lamination sheet, so as to realize the fixed connection of the first split lamination sheet, the second split lamination sheet, the third split lamination sheet and the fourth split lamination sheet.

[0041] In specific embodiments, the first connecting piece 2 is a dovetail groove opened at the first end of the split lamination sheet 1; the second connecting piece 3 is a dovetail latch provided at the second end of the split lamination sheet 1; and the dovetail latch matches the dovetail groove.

[0042] More specifically, the dovetail groove shape is similar to the tail of a swallow, which forms two interlocking concave and convex parts with the dovetail tongue. This design can achieve close connection and locking between adjacent split laminations 1. The dovetail tongue and dovetail groove locking effect mainly reflects the interlocking and stability of the structure design. The dovetail groove is a common connection method, which designs the shape of two objects into a dovetail shape that fits each other, achieving precise splicing and firm connection. This design not only can withstand large tensile and shear forces, but also can form a stable locking effect after compression, thereby eliminating the leakage path.

[0043] In specific embodiments, the first end of the split lamination 1 has a first welding groove 4, the second end of the split lamination 1 has a second welding groove 5, and the first welding groove 4 at the first end of the split lamination 1 and the second welding groove 5 at the second end of the adjacent split lamination 1 can be combined into a welding groove. The second welding groove 5 at the second end of the split lamination 1 and the first welding groove 4 at the first end of the adjacent split lamination 1 can also be combined into a welding groove.

[0044] The welding groove plays a key role in the splicing process of the split lamination 1 stator core. Through welding of the welding groove, multiple split laminations 1 can be firmly connected together, thereby ensuring the strength and stability of the entire stator core. For example, when six stator core split structures are spliced into a whole circular stator core module, the adjacent two layers of whole circular stator core modules are rotated by 30° and spliced by staggering, and the welding groove can be overlapped and welded, thereby ensuring the strength of the overall structure.

[0045] In specific embodiments, the first welding groove 4 is a first arc structure, and the second welding groove 5 is a second arc structure, and the first arc structure and the second arc structure can be combined into a whole circle.

[0046] More preferably, the first arc structure and the second arc structure are both semicircles. Another semicircle is combined into a whole circle. The circular welding groove can improve the conductor filling condition, and the round bottom groove can better embed the wire, especially under the same slot filling rate, the round bottom groove is easier to embed the wire than the flat bottom groove, thereby improving the slot fill rate and efficiency of the motor. The circular welding groove can also reduce magnetic leakage, which helps to improve the magnetic performance of the motor, thereby improving the overall performance of the motor. In addition, during the welding process, the circular welding groove can better adapt to the requirements of the welding process, especially in the case of high precision and high quality welding, the circular structure helps to reduce welding defects and improve the yield of welded products.

[0047] In specific embodiments, the split lamination 1 includes a yoke 11 and a plurality of stator teeth 12, the yoke 11 is a circular arc, and the plurality of stator teeth 12 are uniformly arranged along the inner circle of the yoke 11.

[0048] When multiple said split laminations 1 are connected end to end, multiple yokes 11 form a ring structure, mainly used to guide and concentrate magnetic flux, thereby improving the efficiency of the motor's magnetic circuit. In addition, in some designs, the height of the yoke 11 is controlled within a certain proportion of the tooth height (such as not more than 1.5 times the tooth height) to ensure the effective guidance and stability of the magnetic flux. The stator teeth 12 are the part of the motor used to embed the winding, and its design directly affects the electromagnetic performance of the motor.

[0049] The stator teeth 12 and the yoke 11 together form the winding slot, which is the key part of the motor winding embedding and magnetic flux path. The yoke 11 and the stator teeth 12 play complementary roles in the stator lamination. The yoke 11 is mainly responsible for the guidance and heat dissipation of the magnetic flux, while the stator teeth 12 are responsible for embedding the winding and optimizing the electromagnetic performance. The design and cooperation of the two directly affect the overall performance and reliability of the motor.

[0050] In specific embodiments, the circular arc angle θ of the yoke 11 is 360 / n, where n is the number of said split laminations 1. For example, assuming that four split laminations 1 are combined to form a stator lamination, the circular arc angle θ of the yoke 11 is 90°, assuming that five split laminations 1 are combined to form a stator lamination, the circular arc angle θ of the yoke 11 is 72°, and assuming that six split laminations 1 are combined to form a stator lamination, the circular arc angle θ of the yoke 11 is 60°.

[0051] In specific embodiments, the split lamination 1 has a keyway 13 on the outer side. The keyway 13 on the outer side of the split lamination 1 mainly serves to achieve the fastening connection and positioning of the stator core. Specifically, the keyway 13 plays the following roles in the split stator core: fastening connection: in the design of the split stator core, the keyway is usually matched with the corresponding key or protruding key, and the fan-shaped core unit is tightly combined with the circular ring-shaped core seat or other adjacent core units through the interference inlaying method, which can avoid the problem of unreliable motor operation due to looseness. Positioning function: the keyway 13 can also be used as a marking slot to help workers distinguish the forward and reverse directions when stacking split laminations, ensuring the correctness and consistency of the stack. This helps to keep the slot shape neat and the burr direction consistent, thereby improving the stability and manufacturing efficiency of the overall structure.

[0052] In specific embodiments, a rivet hole 14 is provided on the split lamination 1. The rivet 6 passes through the rivet holes 14 on multiple said stator laminations, which can stack multiple split laminations 1 together through riveting to form a whole structure. This design can ensure that the split laminations can be tightly fitted during assembly, and the overall stability and strength can be enhanced through the connection of the rivets.

[0053] In specific embodiments, the stator core further comprises rivets 6 passing through rivet holes 14 on a plurality of the stator laminations to achieve fixation of the plurality of the stator laminations.

[0054] The stator core provided by the embodiment applies the stator laminations in the embodiment 1, and the split type laminations reduce material waste and improve material utilization by reducing the size of the overall stamping die.

[0055] In addition, the stator core provided by the embodiment is applied to a motor.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A stator core characterized by, The stator core comprises stator laminations, the stator laminations comprise at least two split laminations, the at least two split laminations are sequentially connected head-to-tail to form the stator lamination, a plurality of the stator laminations are stacked to form the stator core, and gaps of the stator laminations of adjacent layers are arranged in a staggered manner, wherein the gap is a gap between adjacent split laminations.

2. The stator core according to claim 1, characterized by The first end of the split lamination has a first connecting piece, the second end of the split lamination has a second connecting piece, the first connecting piece of the first end of the split lamination matches the second connecting piece of the second end of the split lamination adjacent thereto, and the second connecting piece of the second end of the split lamination matches the first connecting piece of the first end of the split lamination adjacent thereto.

3. The stator core of claim 2, characterized by The first connecting piece is a dovetail groove formed in the first end of the split lamination, the second connecting piece is a dovetail latch provided on the second end of the split lamination, and the dovetail latch matches the dovetail groove.

4. The stator core of claim 1, characterized by The first end of the split lamination has a first welding groove, the second end of the split lamination has a second welding groove, the first welding groove of the first end of the split lamination and the second welding groove of the second end of the split lamination adjacent thereto can be combined into a welding groove, and the second welding groove of the second end of the split lamination and the first welding groove of the first end of the split lamination adjacent thereto can also be combined into a welding groove.

5. The stator core of claim 4, characterized by The first welding groove is a first arc structure, the second welding groove is a second arc structure, and the first arc structure and the second arc structure can be combined into a complete circle.

6. The stator core of claim 1, characterized by The split lamination comprises a yoke and a plurality of stator teeth, the yoke is in a circular arc shape, and the plurality of stator teeth are uniformly arranged along an inner circle of the yoke.

7. The stator core of claim 6, characterized by The circular arc angle θ of the yoke is 360 / n, where n is the number of the split laminations.

8. The stator core according to any one of claims 1 to 7, characterized in that, A key groove is formed on the outer side of the split lamination.

9. The stator core according to any one of claims 1 to 7, characterized in that, A rivet hole is formed on the split lamination.

10. The stator core of claim 9, characterized by The stator core further comprises a rivet, the rivet passes through the rivet holes on the plurality of stator laminations to fix the plurality of stator laminations.

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