Double stacked connection stator core

Abstract

The invention relates to the technical field of stators, in particular to a double-stacked connection stator core, which comprises a plurality of groups of stator punching sheets which are stacked and are welded and connected after welding grooves on the plurality of groups of stator punching sheets are aligned to form a central punching sheet group; the end punching sheet groups are stacked at the two ends of the central punching sheet group, and the parts close to the central punching sheet group are welded and connected with the central punching sheet group; and the end punching sheet group is formed by stacking and bonding a plurality of groups of self-adhesive punching sheets. The phenomenon that the flatness of the end face is unstable due to laser hot penetration after a traditional stator is welded is avoided; and the problem of insufficient welding strength caused by welding arc suppression of the end face punching sheet is also solved.

Description

Technical Field

[0001] The present invention relates to the technical field of stators, and specifically refers to a double-stack connected stator core. Background Art

[0002] A stator punching sheet is a thin silicon steel sheet formed by stamping for manufacturing a stator core of an electric motor, and it is the basic unit of the stator core.

[0003] After the conventional stator punching sheets are stacked, their welding grooves are aligned and then the stacked stator punching sheets are connected together by laser welding, such as Figure 1 .

[0004] After welding, due to laser heat penetration, the flatness of the end face will be unstable (the flatness after conventional laser welding > 0.3 mm, and the flatness of the self-adhesive coating < 0.05 mm);

[0005] Due to insufficient welding strength caused by the welding arc extinguishing, the connection strength after welding is generally below 2000 N. Summary of the Invention

[0006] (1) Technical Problem

[0007] The present invention aims to solve at least the problems of poor quality at the ends of stator punching sheets and insufficient connection strength existing in the prior art.

[0008] (2) Technical Content

[0009] This solution provides a double-stack connected stator core, which is achieved by the following specific technical means, including:

[0010] Stator punching sheets, stacked in multiple groups and welded together after the welding grooves on the multiple groups of stator punching sheets are aligned to form a central punching sheet group;

[0011] End punching sheet groups, there are two groups, respectively stacked at both ends of the central punching sheet group, and the parts close to the central punching sheet group are welded to the central punching sheet group;

[0012] The end punching sheet group is formed by stacking and bonding multiple groups of self-adhesive punching sheets.

[0013] Preferred Technical Solution 1: The end punching sheet group contains 1 to 20 self-adhesive punching sheets.

[0014] Preferred Technical Solution 2: The self-adhesive punching sheet is a silicon steel punching sheet with a self-adhesive coating.

[0015] Preferred Technical Solution 3: The side of the self-adhesive punching sheet also has a welding groove.

[0016] Preferred Technical Solution 4: The stator punching sheet is a conventional silicon steel punching sheet.

[0017] (III) Technical Effects

[0018] Adopting the above structure enables this solution to have the following beneficial effects:

[0019] 1. Since the self-adhesive punching pieces in the end punching piece group are bonded, the welding track does not need to extend to the outermost self-adhesive punching piece. Therefore, the problem of unstable end face flatness caused by laser heat penetration after traditional stator welding is solved;

[0020] 2. Since the front and rear ends of the stator are bonded, the welding track does not need to strictly control the arc extinguishing position, solving the problem of insufficient welding strength caused by arc extinguishing during welding of the end punching pieces. Brief Description of the Drawings

[0021] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0022] Figure 1 is a schematic structural diagram of an existing stator;

[0023] Figure 2 is a perspective view of this solution;

[0024] Figure 3 is a side view of this solution;

[0025] Figure 4 is a front view of the stator punching piece of this solution.

[0026] Among them, 1. Central punching piece group, 11. Stator punching piece, 2. End punching piece group, 21. Self-adhesive punching piece, 3. Welding groove. Detailed Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] Please refer to Figures 2 - 4 , a double-stack connected stator core, including a stator punching piece 11 and an end punching piece group 2:

[0029] The stator punching piece 11 is a conventional silicon steel punching piece, stacked in multiple groups. During processing, the welding grooves 3 on multiple groups of stator punching pieces 11 are aligned and then welded and connected along the welding grooves 3 by laser welding to form a central punching piece group 1;

[0030] Two groups of end punching sheet groups 2 are respectively stacked at both ends of the central punching sheet group 1. The end punching sheet group 2 is formed by stacking and bonding 1 to 20 self-adhesive punching sheets 21. The bonding operation is as follows: multiple groups of self-adhesive punching sheets 21 are preheated and cured under pressure so that the self-adhesive punching sheets 21 are bonded together to form the end punching sheet group 2. There are also welding grooves 3 on the side of the self-adhesive punching sheet 21. When bonding, the welding grooves 3 of multiple groups of self-adhesive punching sheets 21 are aligned;

[0031] During assembly, the two bonded end punching sheet groups 2 are respectively placed at both ends of the central punching sheet group 1, and the welding grooves 3 are kept aligned. Then, laser welding is used to weld along the welding grooves 3 at the docking part between the end punching sheet group 2 and the central punching sheet group 1, connecting the end punching sheet groups 2 at both ends and the central punching sheet group 1 together. The welding track does not extend to the outermost self-adhesive punching sheet 21.

[0032] Please refer to Figures 2 - 3 , for the double-stack connected stator core. The self-adhesive punching sheet 21 is a silicon steel punching sheet with a self-adhesive coating. The self-adhesive coating is preferably an epoxy resin bonding coating. The connection strength between the self-adhesive punching sheets 21 has been verified that the bonding force can reach more than 50 times the connection strength of laser welding.

[0033] Please refer to Figures 3 - 4 , for the double-stack connected stator core. The improvement of this solution lies in the connection method of the punching sheets, rather than the inner wall structure of the punching sheets. Therefore, the inner wall groove structure and the inner and outer diameters of the self-adhesive punching sheet 21 and the stator punching sheet 11 are the same, thus forming the stator core.

[0034] The parts not disclosed in the present invention are all prior arts, and their specific structures and working principles will not be elaborated here.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double stacked stator core, comprising stator punching sheets (11), multiple groups of which are stacked and placed, and the welding grooves (3) on the multiple groups of stator punching sheets (11) are aligned and welded to form a central punching sheet group (1), characterized in that: Also includes The end punching sheet groups (2) include two groups, which are respectively stacked on the two ends of the center punching sheet group (1), and the parts close to the center punching sheet group (1) are welded and connected to the center punching sheet group (1); The end punching sheet group (2) is formed by stacking and bonding multiple groups of self-adhesive punching sheets (21).

2. A double stacked stator core according to claim 2, characterized in that: The self-adhesive punching sheet (21) is a silicon steel punching sheet with a self-adhesive coating.

3. A double stacked stator core according to claim 1 or 2, characterized in that: The side of the self-adhesive punching sheet (21) also has a welding groove (3), and the welding grooves (3) on the multiple groups of self-adhesive punching sheets (21) in the end punching sheet group (2) are aligned; At the same time, the welding groove (3) on the end punching sheet group (2) is aligned with the welding groove (3) on the center punching sheet group (1), and a welding connection is performed at the connection point, and the welding track does not extend to the outermost self-adhesive punching sheet (21).

4. The double stacked stator core according to claim 1, characterized in that: The end punching sheet group (2) contains 1 to 20 self-adhesive punching sheets (21).

5. The double stacked stator core according to claim 1, characterized in that: The inner wall groove structures and inner and outer diameters of the self-adhesive punching sheet (21) and the stator punching sheet (11) are consistent.

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