A double layer slot bottom insulation paper structure

Abstract

The utility model relates to motor stator insulation technical field, concretely is a kind of double-layer slot bottom insulation paper structure, including the first insulation paper and second insulation paper of laminated arrangement, the first insulation paper includes A face and B face, the two side edges of width direction of the first insulation paper are equipped with the folding edge bent to A face, the folding edge and the body of first insulation paper jointly constitute limiting groove, the second insulation paper is flat plate structure, the second insulation paper is stacked in the limiting groove of first insulation paper, the two side edges of the second insulation paper and the inside wall of the folding edge abut, the first insulation paper and second insulation paper in length direction Two sides are bent to B face jointly and form the bending part for assembling with stator slot, the utility model prevents effectively two layers of insulation paper misplacement by folding edge structure, improves the neatness and assembly reliability of insulation paper, applicable to motor stator slot insulation field.

Description

Technical Field

[0001] This utility model relates to the field of motor stator insulation technology, specifically a double-layer slot bottom insulation paper structure. Background Technology

[0002] In the manufacturing process of motor stators, two layers of insulating paper are typically laid at the bottom of the stator slot to improve the insulation performance within the slots, thereby enhancing the electrical insulation between windings and between the windings and the iron core. The traditional method involves directly stacking two flat sheets of insulating paper, bending them, and then inserting the whole assembly into the stator slot. However, in practice, due to the smooth material of the insulating paper and the lack of an effective positioning structure, the two layers of insulating paper are prone to relative sliding and misalignment during stacking, bending, and installation, leading to problems such as uneven edges and uneven thickness in certain areas. This not only affects the neatness of the insulating paper's appearance but also reduces the withstand voltage strength of the insulation within the slot. During motor operation, vibration may cause further displacement of the insulation layer, leading to partial discharge or even short circuit risks, seriously affecting the reliability and service life of the motor. Therefore, a new structure that can effectively prevent misalignment of the double-layer insulating paper and improve assembly quality and insulation stability is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide a double-layer grooved bottom insulating paper structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a double-layer groove bottom insulating paper structure, comprising a first insulating paper and a second insulating paper stacked together. The first insulating paper includes an A side and a B side. The two sides of the width direction of the first insulating paper are provided with folded edges that bend towards the A side. The folded edges and the body of the first insulating paper together form a limiting groove. The second insulating paper is a flat structure. The second insulating paper is stacked in the limiting groove of the first insulating paper. The two sides of the second insulating paper abut against the inner sidewall of the folded edges. The first insulating paper and the second insulating paper are bent towards the B side on both sides in the length direction to form a bent portion for assembly with the stator groove.

[0005] Preferably, the first insulating paper has the following dimensions: length 50-350mm, width 30-130mm, and thickness 0.25-0.6mm.

[0006] Preferably, the dimensions of the second insulating paper are 50-350mm in length, 20-120mm in width, and 0.25-0.6mm in thickness.

[0007] Preferably, the height of the folded edge is 0.5mm-2mm.

[0008] Preferably, both the first insulating paper and the second insulating paper are made of NMN insulating paper.

[0009] Preferably, the folded edge is made by a mechanical bending process.

[0010] Compared with existing technologies, this utility model provides a double-layer groove-bottom insulating paper structure with the following advantages: By setting folded edges on both sides of the first insulating paper to form limiting grooves, the second insulating paper is embedded in them, effectively restricting the relative movement of the two insulating paper layers in the width direction and avoiding the misalignment phenomenon common in traditional structures. This structure not only improves the neatness and assembly efficiency of the insulating paper, but also enhances the integrity and reliability of the insulation layer, reducing the risk of insulation failure caused by misalignment. At the same time, the design of the bending part facilitates matching and installation with the stator slot, further improving the practicality and applicability of the product. Attached Figure Description

[0011] Figure 1 This is a schematic diagram showing the separation state of the existing first insulating paper and the existing second insulating paper; Figure 2 This is a schematic diagram showing the state where existing first insulating paper and existing second insulating paper are easily misaligned after being stacked. Figure 3 This is a schematic diagram of the structure of the existing first insulating paper and the existing second insulating paper after bending. Figure 4 This is a schematic diagram of the structure of the first insulating paper and the second insulating paper of this utility model; Figure 5 This is a schematic diagram of the structure of the first insulating paper and the second insulating paper after being stacked in this utility model; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the bent portion formed after the first and second insulating papers are bent in this utility model. Figure 8 This is a schematic diagram of the stator core structure; Figure 9 for Figure 8 An explosion diagram.

[0012] Explanation of reference numerals in the attached drawings: 1. First insulating paper; 11. Side A; 12. Side B; 2. Second insulating paper; 3. Folded edge; 4. Limiting groove; 5. Bending part; 6. Existing first insulating paper; 7. Existing second insulating paper; 8. Stator core; 81. Stator slot; 9. Winding. Detailed Implementation

[0013] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model: like Figure 1-3As shown, in the traditional double-layer slot bottom insulation paper structure, two flat insulation papers (i.e., the existing first insulation paper 6 and the existing second insulation paper 7) are usually directly stacked and bent before being inserted into the stator slot as a whole. However, due to the smooth surface of the insulation paper and the lack of an effective positioning structure, the two layers of insulation paper are prone to relative sliding and misalignment during stacking, bending, and installation, resulting in problems such as uneven edges and uneven thickness in some areas. This misalignment not only affects the overall aesthetics of the insulation paper, but also causes inconsistent insulation thickness in the motor stator slot, a decrease in local withstand voltage, and even displacement of the insulation layer due to vibration during use, increasing the risk of short circuits and reducing the reliability and lifespan of the motor.

[0014] To solve the above problems, this utility model provides a double-layer groove bottom insulating paper structure that is structurally reasonable, easy to assemble, and has a significant anti-misalignment effect. The following will describe it in conjunction with the attached... Figure 4-9 The specific embodiments of this utility model will be described in detail.

[0015] like Figure 4-9 As shown, this utility model provides a double-layer groove bottom insulating paper structure, including a first insulating paper 1 and a second insulating paper 2 stacked together. The dimensions of the first insulating paper 1 are 50-350mm in length, 30-130mm in width, and 0.25-0.6mm in thickness. The dimensions of the second insulating paper 2 are 50-350mm in length, 20-120mm in width, and 0.25-0.6mm in thickness. Both the first insulating paper 1 and the second insulating paper 2 are made of NMN insulating paper, which has good insulation performance.

[0016] The first insulating paper 1 includes an A-side 11 and a B-side 12. The two edges of the first insulating paper 1 in the width direction are provided with folded edges 3 that bend towards the A-side 11. The folded edges 3 are made by a mechanical bending process, and their height is 0.5mm-2mm. The folded edges 3 and the body of the first insulating paper 1 together form a limiting groove 4. This limiting groove 4 is used to accommodate and limit the second insulating paper 2, preventing it from shifting in the width direction.

[0017] The second insulating paper 2 has a flat structure. The second insulating paper 2 is stacked in the limiting groove 4 of the first insulating paper 1. The two side edges of the second insulating paper 2 abut against the inner side wall of the folded edge 3. This structural design ensures that the two layers of insulating paper remain aligned during the stacking process, avoiding the misalignment problem caused by the lack of constraints in the traditional method.

[0018] The first insulating paper 1 and the second insulating paper 2 are bent together on both sides along the length direction toward surface B 12 to form a bent portion 5 for assembly with the stator slot 81. This bent portion 5 is used to assemble with the stator slot 81 in the stator core 8, ensuring that the insulating paper structure is firmly embedded in the slot and providing reliable insulation between the windings 9.

[0019] The specific assembly steps are as follows: 1. Prepare the first insulating paper 1: Cut the first insulating paper 1 according to the size of the stator slot 81 of the stator core 8, ensuring that its width is slightly larger than the second insulating paper 2, and leave space for folding edges; 2. Forming folded edge 3: Using mechanical bending equipment, bend the two edges of the first insulating paper 1 in the width direction to form a folded edge 3 with a height of 0.5-2mm, thereby forming the limiting groove 4; 3. Place the second insulating paper 2: Insert the pre-cut second insulating paper 2 into the limiting groove 4 in a flat shape, so that its two sides are in contact with the inner wall of the folded edge 3, ensuring that there is no misalignment or lifting; 4. Overall bending and forming: The stacked first insulating paper 1 and second insulating paper 2 are bent together on both sides of the length direction toward surface B 12 to form a bent part 5 that matches the structure of stator slot 81. The bending process requires control of force and angle to avoid damage to the insulating paper. 5. Installation into stator slot 81: The formed double-layer insulating paper structure is inserted into the stator slot 81 of the stator core 8. The bending part 5 is used to cooperate with the slot wall to achieve a tight installation. Then, the winding 9 is embedded in the slot. The insulating paper structure is located between the winding 9 and the stator core 8, playing a key role in slot bottom insulation, effectively preventing electrical short circuits between windings and improving the safety and reliability of motor operation.

[0020] This utility model effectively avoids the misalignment problem of the two layers of insulating paper during assembly and use through the folded edge and limiting groove structure, which significantly improves the neatness of the insulation layer and the assembly efficiency. It is suitable for various motor stator slot insulation applications and has the advantages of simple structure, strong applicability and high reliability.

[0021] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A double-layer grooved bottom insulating paper structure, characterized in that: The first insulating paper (1) and the second insulating paper (2) are stacked together. The first insulating paper (1) includes an A-side (11) and a B-side (12). The two sides of the first insulating paper (1) in the width direction are provided with folded edges (3) that bend towards the A-side (11). The folded edges (3) and the body of the first insulating paper (1) together form a limiting groove (4). The second insulating paper (2) is a flat structure. The second insulating paper (2) is stacked in the limiting groove (4) of the first insulating paper (1). The two sides of the second insulating paper (2) abut against the inner sidewall of the folded edges (3). The first insulating paper (1) and the second insulating paper (2) are bent towards the B-side (12) on both sides in the length direction to form a bent part (5) for assembly with the stator slot (81).

2. The double-layer groove bottom insulating paper structure according to claim 1, characterized in that: The first insulating paper (1) has the following dimensions: length 50-350mm, width 30-130mm, and thickness 0.25-0.6mm.

3. The double-layer groove bottom insulating paper structure according to claim 1, characterized in that: The second insulating paper (2) has the following dimensions: length 50-350mm, width 20-120mm, and thickness 0.25-0.6mm.

4. The double-layer groove bottom insulating paper structure according to claim 1, characterized in that: The height of the folded edge (3) is 0.5mm-2mm.

5. The double-layer groove bottom insulating paper structure according to claim 1, characterized in that: The first insulating paper (1) and the second insulating paper (2) are both made of NMN insulating paper.

6. The double-layer groove bottom insulating paper structure according to claim 1, characterized in that: The folded edge (3) is made by mechanical bending process.

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