Method for manufacturing a laminated core

Abstract

To provide a lamination core production method in which an adhesive can be easily applied to a gap between layered electromagnetic steel sheets.SOLUTION: A lamination core production method according to the present disclosure includes a first step ST1, a second step ST2, and a third step ST3. In the first step ST1, a plurality of electromagnetic steel sheets 1 are layered in a lamination direction, whereby an electromagnetic steel plate laminate 10 is formed. In the second step ST2, the electromagnetic steel plate laminate 10 is excited in a direction intersecting the lamination direction. In the third step ST3, an adhesive is applied to a gap between the electromagnetic steel sheets 1 of the electromagnetic steel plate laminate 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a laminated core.

Background Art

[0002] Patent Document 1 discloses, as an example of a method for manufacturing such a laminated core, a method for manufacturing a laminated steel plate by laminating a plurality of steel plates. This method for manufacturing a laminated steel plate includes a coating step of applying an adhesive to the surface of a steel plate, and a laminating step of laminating the steel plate having the adhesive applied thereto and another steel plate while shifting their positions around an axis, and adhering the steel plate and the laminate with the adhesive.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have found the following problems. In such a method for manufacturing a laminated core, among a plurality of steel plates, after applying an adhesive to each steel plate one by one, the plurality of steel plates are laminated. Therefore, the coating step may require a long time. Thus, the inventors of the present application thought of a method for manufacturing a laminated core in which an adhesive is applied to the gaps between a plurality of laminated steel plates, but the gaps between the plurality of steel plates are small and it is difficult to apply the adhesive.

[0005] The present disclosure has been made in view of the above-described problems, and aims to provide a method for manufacturing a laminated core capable of easily applying an adhesive to the gaps between laminated electromagnetic steel plates.

Means for Solving the Problems

[0006] The method for manufacturing a laminated core according to the present disclosure is A first step of laminating a plurality of electromagnetic steel sheets in the lamination direction to form an electromagnetic steel sheet laminate; A second step of exciting the electromagnetic steel sheet laminate in a direction intersecting the lamination direction; And a third step of applying an adhesive to the gaps between the plurality of electromagnetic steel sheets in the electromagnetic steel sheet laminate.

[0007] According to such a configuration, after exciting the electromagnetic steel sheet laminate in a direction intersecting the lamination direction, an adhesive is applied to the gaps between the plurality of electromagnetic steel sheets. Therefore, the adhesive can be easily applied to the gaps between the plurality of electromagnetic steel sheets.

[0008] Also, in the second step of the manufacturing method of the laminated core described above, The electromagnetic steel sheet laminate may be excited in a direction intersecting the lamination direction to repel the plurality of electromagnetic steel sheets from each other and expand the gaps between the plurality of electromagnetic steel sheets.

[0009] According to such a configuration, after exciting the electromagnetic steel sheet laminate in a direction intersecting the lamination direction, the gaps between the plurality of electromagnetic steel sheets are expanded and then the adhesive is applied. Therefore, the adhesive can be more reliably applied to the gaps between the plurality of electromagnetic steel sheets.

[0010] Also, in the first step of the manufacturing method of the laminated core described above, The electromagnetic steel sheet laminate may be formed by laminating the plurality of electromagnetic steel sheets and caulking the laminated plurality of electromagnetic steel sheets.

Advantages of the Invention

[0011] According to the present disclosure, an adhesive can be easily applied to the gaps between the laminated electromagnetic steel sheets.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0013] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are simplified as appropriate.

[0014] (Embodiment 1) The method for manufacturing a laminated core according to Embodiment 1 will be described with reference to FIGS. 1 to 5. FIG. 1 is a flowchart showing the method for manufacturing a laminated core according to Embodiment 1.

[0015] Of course, the right-handed XYZ coordinates shown in FIG. 2 and other drawings are for convenience in explaining the positional relationship of the components. Usually, the Z-axis direction is the lamination direction, the XY plane is the main surface of the electromagnetic steel sheet 1, and it is common among the drawings.

[0016] The method for manufacturing a laminated core according to Embodiment 1 can manufacture the laminated core 100 shown in Fig. 2(a). Fig. 2(a) is a perspective view showing an example of a laminated core by the method for manufacturing a laminated core according to Embodiment 1. The laminated core 100 according to Embodiment 1 is a stator core, but may also be a rotor core. The laminated core 100 includes a plurality of electromagnetic steel sheet laminates 10. An example of the laminated core 100 shown in Fig. 2(a) includes six electromagnetic steel sheet laminates 10. The six electromagnetic steel sheet laminates 10 are arranged along a substantially circular shape.

[0017] First, a plurality of electromagnetic steel sheets 1 are laminated in the lamination direction to form an electromagnetic steel sheet laminate 10 (first step ST1). As shown in Fig. 2(b), an example of the electromagnetic steel sheet laminate 10 is a block body extending in a substantially T shape, and includes an arc-shaped portion 10a extending in an arc shape and a protrusion portion 10b. The protrusion portion 10b protrudes from near the center of the arc-shaped portion 10a toward the center of the arc along which the arc-shaped portion 10a extends. The electromagnetic steel sheet laminate 10 includes the plurality of laminated electromagnetic steel sheets 1. Fig. 2(b) is a schematic view showing the first step in the method for manufacturing a laminated core according to Embodiment 1. For example, it is a plate-like body extending in a substantially T shape. An example of the electromagnetic steel sheet laminate 10 shown in Fig. 2(b) is formed by laminating six electromagnetic steel sheets 1 in the lamination direction (here, the Z-axis direction), but the number of electromagnetic steel sheets 1 may be any plural number and is not limited to this.

[0018] Specifically, a plurality of electromagnetic steel sheets 1 may be laminated in the lamination direction, and the laminated electromagnetic steel sheets 1 may be caulked to form an electromagnetic steel sheet laminate 10. As shown in FIGS. 3(a) and 3(b), the formed electromagnetic steel sheet laminate 10 includes a caulked portion 11. FIG. 3(a) is a top view schematically showing the electromagnetic steel sheet laminate 10 after performing the first step in the method for manufacturing a laminated core according to Embodiment 1. FIG. 3(b) is a side view of the electromagnetic steel sheet laminate 10 shown in FIG. 3(a). The caulked portion 11 is between a plurality of electromagnetic steel sheets 1 that are caulked and pressed against each other, and temporarily holds the plurality of electromagnetic steel sheets 1. For example, the plurality of electromagnetic steel sheets 1 in the caulked portion 11 may be pressed in the lamination direction and plastically deformed. An example of the caulked portion 11 shown in FIG. 3(b) is provided near the center of the protrusion 10b of the electromagnetic steel sheet laminate 10, but the caulked portion 11 may be provided at any position of the electromagnetic steel sheet laminate 10. There is almost no gap between the plurality of electromagnetic steel sheets 1 in the caulked portion 11. Further, in order to ensure the shape accuracy of the electromagnetic steel sheet laminate 10, there is preferably almost no gap between the plurality of electromagnetic steel sheets 1 at the tip of the protrusion 10b or at the outer edge of the arc-shaped portion 10a.

[0019] Subsequently, as shown in FIGS. 3(a) to 3(d), the electromagnetic steel sheet laminate 10 is excited in a direction intersecting the lamination direction (second step ST2). FIG. 3(c) is a top view schematically showing the electromagnetic steel sheet laminate 10 after performing the second step. FIG. 3(d) is a side view of the electromagnetic steel sheet laminate 10 shown in FIG. 3(c). Specifically, the N pole of the permanent magnet M1 is brought close to or into contact with the tip of the protrusion 10b of the electromagnetic steel sheet laminate 10. Here, the permanent magnet M1 is a substantially rod-shaped body, and the N pole and the S pole are arranged side by side along its axial direction (here, Y-axis direction ). More specifically, while the magnetization direction of the permanent magnet M1 remains along the direction intersecting the lamination direction (here, the Y-axis direction), the N pole of the permanent magnet M1 is brought close to the tip of the protrusion 10b of the electromagnetic steel sheet laminate 10. The direction intersecting the lamination direction is, for example, a direction orthogonal to this lamination direction, or in FIGS. 3(a) to 3(d), the X-axis direction, the Y-axis direction, etc., and may be any direction other than the Z-axis direction. When the electromagnetic steel sheet laminate 10 is excited in a direction intersecting the lamination direction, the plurality of electromagnetic steel sheets 1 are separated from each other.

[0020] Here, referring to FIG. 4, the principle of separation between a plurality of electromagnetic steel sheets in the second step ST2 will be described. FIG. 4 is a schematic diagram for explaining the principle of separation between a plurality of electromagnetic steel sheets.

[0021] As shown in FIG. 4, in the second step ST2, the permanent magnet M1 and the plurality of electromagnetic steel sheets 1 approach or contact each other (step ST21). Then, the plurality of electromagnetic steel sheets 1 are excited (step ST22). Then, the plurality of electromagnetic steel sheets 1 are excited and have an N pole and an S pole. One end of the plurality of electromagnetic steel sheets 1 is the N pole, and the other end is the S pole. Since one ends of the plurality of electromagnetic steel sheets 1 are all N poles, one ends of adjacent electromagnetic steel sheets 1 receive a repulsive force due to magnetic force from each other. Similarly, since the other ends of the plurality of electromagnetic steel sheets 1 are all S poles, the other ends of adjacent electromagnetic steel sheets 1 receive a repulsive force due to magnetic force from each other. By these, the plurality of electromagnetic steel sheets 1 are repelled from each other, and the gap between the plurality of electromagnetic steel sheets 1 is enlarged. Note that in the caulked portion 11, the plurality of electromagnetic steel sheets 1 are caulked and pressed against each other, while at the tip of the protrusion 10b and the outer edge of the arc-shaped portion 10a, the plurality of electromagnetic steel sheets 1 are not pressed against each other and are free. Therefore, the plurality of electromagnetic steel sheets 1 at the tip of the protrusion 10b and the outer edge of the arc-shaped portion 10a tend to have a larger gap compared to that in the caulked portion 11. Note that the size of the gap between the plurality of electromagnetic steel sheets 1 may be appropriately adjusted and determined based on the specifications of the caulked portion 11, the rigidity of the electromagnetic steel sheet 1, and the magnetic force of the electromagnetic steel sheet 1.

[0022] Finally, an adhesive is applied to the gap between the plurality of electromagnetic steel sheets 1 in the electromagnetic steel sheet laminate 10 (third step ST3). In the second step ST2, since the plurality of electromagnetic steel sheets 1 are separated from each other, the adhesive can be easily applied to the gap between the plurality of electromagnetic steel sheets 1.

[0023] Here, as shown in FIG. 5, the relationship between the temperature of the adhesive, the gap (penetration distance), and the arrival time will be described. FIG. 5 is a graph showing the relationship between the temperature of the adhesive, the gap (penetration distance), and the arrival time.

[0024] As shown in FIG. 5, the relationship between the temperature of the adhesive and the arrival time is generally inversely proportional. Also, when the temperature of the adhesive is high, that is, when the viscosity of the adhesive is low, the arrival time tends to be shortened. On the other hand, in many cases, since the adhesive is a thermosetting adhesive, if the temperature of the adhesive becomes too high, the curing reaction proceeds too far. Therefore, the temperature of the adhesive is set within a predetermined range. As shown in FIG. 5, when the temperature of the adhesive is constant, as the gap becomes larger, the arrival time tends to be shortened. Therefore, when the gap between the plurality of electromagnetic steel sheets 1 expands, the arrival time of the adhesive may be shortened.

[0025] Note that after the third step ST3, each of the plurality of electromagnetic steel sheet laminates 10 is impregnated. Then, by assembling the plurality of electromagnetic steel sheet laminates 10, the laminated core 100 shown in FIG. 2(a) is formed. Specifically, after the third step ST3, the electromagnetic steel sheet laminate 10 may be impregnated as it is, or the electromagnetic steel sheet laminate 10 may be placed in a constant temperature furnace and heated and held, for example, at 50° C. for impregnation. Further, after impregnating the electromagnetic steel sheet laminate 10, while pressing it into a required shape and fixing it, excess adhesive protruding from the gap between the plurality of electromagnetic steel sheets 1 may be removed. Then, the electromagnetic steel sheet laminate 10 may be heated and held, for example, at 100° C. to cure the adhesive.

[0026] From the above, according to the method for manufacturing a laminated core according to the above-described Embodiment 1, after exciting the electromagnetic steel sheet laminate 10 in the lamination direction, an adhesive is applied to the gap between the plurality of electromagnetic steel sheets 1. Therefore, the adhesive can be easily applied to the gap between the plurality of electromagnetic steel sheets 1.

[0027] Also, in the second step of the method for manufacturing a laminated core according to Embodiment 1, the electromagnetic steel sheet laminate 10 is excited in a direction intersecting the lamination direction. Thereby, the plurality of electromagnetic steel sheets 1 repel each other, and the gap between the plurality of electromagnetic steel sheets 1 is expanded. Therefore, after exciting the electromagnetic steel sheet laminate in a direction intersecting the lamination direction, the gap between the plurality of electromagnetic steel sheets 1 is expanded and then the adhesive is applied. Therefore, the adhesive can be more reliably applied to the gap between the plurality of electromagnetic steel sheets 1.

[0028] Also, in the first step according to the first embodiment, a plurality of electromagnetic steel sheets 1 are laminated, and the laminated plurality of electromagnetic steel sheets 1 are caulked to form an electromagnetic steel sheet laminate 10. As a result, the tip of the protrusion 10b and the outer edge of the arc-shaped portion 10a tend to have an enlarged gap compared to the vicinity of the caulked portion 11. Therefore, an adhesive can be easily applied to the gaps between the plurality of electromagnetic steel sheets 1 at the tip of the protrusion 10b and the outer edge of the arc-shaped portion 10a. Also, while integrating the electromagnetic steel sheet laminate 10, a gap is ensured between the plurality of electromagnetic steel sheets. Therefore, the handling of the electromagnetic steel sheet laminate 10 is easy.

[0029] Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist. Also, the present invention may be implemented by appropriately combining the above-described embodiments and examples thereof. For example, in the second step ST2 shown in FIGS. 3(a) to (d), a permanent magnet M1 was used, but an electromagnet may be used. Also, in the second step ST2, while the magnetization direction of the permanent magnet M1 remains along the direction intersecting the lamination direction, the N pole of the permanent magnet M1 was brought close to the tip of the protrusion 10b of the electromagnetic steel sheet laminate 10, but the S pole of the permanent magnet M1 may be brought close to the tip of the protrusion 10b of the electromagnetic steel sheet laminate 10. Also, the permanent magnet M1 may be brought close to a portion other than the tip of the protrusion 10b of the electromagnetic steel sheet laminate 10, for example, close to the outer edge side of the arc-shaped portion 10a.

Explanation of Reference Numerals

[0030] 100 Laminated core, 10 Electromagnetic steel sheet laminate, 10a Arc-shaped portion, 10b Protrusion, 11 Caulked portion, 1 Electromagnetic steel sheet, M1 Permanent magnet, ST1 First step, ST2 Second step, ST21, ST22 Steps, ST3 Third step

Claims

1. A first step of laminating a plurality of electromagnetic steel sheets in a lamination direction to form an electromagnetic steel sheet laminate; A second step of exciting the electromagnetic steel sheet laminate in a direction intersecting the lamination direction; A third step of applying an adhesive to gaps between the plurality of electromagnetic steel sheets in the electromagnetic steel sheet laminate, and comprising: In the second step, The electromagnetic steel sheet laminate is excited in a direction intersecting the lamination direction to repel the plurality of electromagnetic steel sheets from each other and expand the gaps between the plurality of electromagnetic steel sheets. A method for manufacturing a laminated core.

2. In the first step, The plurality of electromagnetic steel sheets are laminated, and the laminated plurality of electromagnetic steel sheets are caulked to form the electromagnetic steel sheet laminate. The method for manufacturing a laminated core according to claim 1.

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