JP2011147241A - Laminated core - Google Patents

Abstract

An object of the present invention is to reduce the amount of steel used and increase the cooling efficiency of a laminated core.
A laminated core (21) according to an embodiment of the present invention is an annular laminated core formed by spirally laminating a plurality of core pieces (811) connected to each other by a connecting portion. Each core piece is provided on the inner peripheral side of the laminated core, and has a main core part in which a tooth part is formed on the inner peripheral side, and a secondary iron core part provided on the outer peripheral side of the main core part. Are connected to each other by a connecting portion provided at the boundary between the main iron core portion and the sub iron core portion, and the connecting portions are arranged in a straight line in the lamination direction of the laminated iron core, so that the outer peripheral surface of the laminated iron core and the connecting portion is A groove (815) extending in the lamination direction of the laminated iron core is formed at the provided position.
[Selection] Figure 1

Description

  The present invention relates to a laminated iron core, and more particularly to a laminated iron core formed by laminating a belt-like iron core in a spiral shape.

  Conventionally, a technique for manufacturing a laminated iron core by laminating a strip-like iron core in a spiral shape has been proposed (see, for example, Patent Document 1). FIG. 5 is a diagram showing a configuration of a conventional laminated iron core. FIG. 5 shows a front view (a) and a side view (b) of the laminated iron core. A two-dot chain line O in FIG. 5 is a straight line parallel to the stacking direction of the stacked cores. As shown in FIG. 5, the laminated iron core 51 is manufactured by spirally laminating a belt-like iron core composed of a plurality of iron core pieces 511 connected to each other by a connecting portion 512. The connecting portion 512 is provided between the outer peripheral portions 513 of the iron core pieces 511. Thereby, the usage-amount of a steel plate can be reduced compared with the case where the laminated iron core is manufactured by laminating | stacking the annular core punched out from the steel plate.

Japanese Patent Laid-Open No. 1-264548

  In recent years, it has been desired to increase the cooling efficiency of the laminated core depending on the use of the laminated core. However, in the above conventional technique, the amount of steel sheet used can be reduced, but no device has been made to increase the cooling efficiency of the laminated core.

  Then, an object of this invention is to reduce the usage-amount of a steel plate and to raise the cooling efficiency of a laminated iron core.

  The present invention has been made in order to solve the above-mentioned problems, and the laminated core according to the present invention is an annular laminate formed by spirally laminating a plurality of iron core pieces connected to each other by a connecting portion. Each core piece is provided on the inner peripheral side of the laminated core, and a main core part having a tooth portion formed on the inner peripheral side, and a sub-core part provided on the outer peripheral side of the main core part, Are connected to each other by a connecting portion provided at a boundary between the main iron core portion and the sub iron core portion, and the connecting portions are arranged in the stacking direction of the laminated iron core so that the outer peripheral surface of the laminated iron core is a connecting portion. A groove extending in the laminating direction of the laminated iron core is formed at the position where is provided.

  Preferably, the shape of each groove is the same.

  Alternatively, a groove extending in the stacking direction of the laminated core is further formed at a position different from the position where the connecting portion is provided on the outer circumferential surface of the laminated core, and each groove is spaced at the same interval in the circumferential direction of the laminated core. You may line up.

  ADVANTAGE OF THE INVENTION According to this invention, the usage-amount of a steel plate can be reduced and the cooling efficiency of a laminated iron core can be improved.

The figure which shows the structural example of the laminated iron core which concerns on the Example of this invention. The figure which shows an example of the structural member of a laminated iron core The figure which shows the other structural example of an iron core piece The figure which shows the other structural example of an iron core piece Diagram showing the structure of a conventional laminated core

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  With reference to FIG. 1 and FIG. 2, the structure of the laminated core which concerns on a present Example is demonstrated. FIG. 1 is a diagram illustrating a configuration example of a laminated iron core according to the present embodiment. FIG. 1 shows a front view (a) of the laminated iron core and a side view (b) of the laminated iron core. A two-dot chain line O in FIG. 1 is a straight line parallel to the stacking direction of the stacked iron cores. FIG. 2 is a diagram illustrating an example of a constituent member of a laminated iron core.

  As shown in FIGS. 1 and 2, the laminated core 21 is formed by laminating a strip-shaped core 81 punched from the strip-shaped steel plate 100 by press working in a spiral manner with the main core portion 8112 facing inward and the teeth portion 8113 aligned. It is manufactured by doing. The strip-shaped iron core 81 is configured by a plurality of iron core pieces 811 connected to each other by a connecting portion 814. Each core piece 811 has a substantially arc shape. Each iron core piece 811 includes a sub iron core portion 8111 for forming an axial fin and a main iron core portion 8112 in which a plurality of tooth portions 8113 are formed. The main iron core portion 8112 corresponds to the iron core piece 511 of the above prior art. The circumferential width of each iron core piece 811 is set to a width represented by an angle having a multiple of 360. In other words, each iron core piece 811 has the same number of teeth 8113 as the multiple of the total number of teeth 8113 of the laminated core 21. As a result, the connecting portions 814 are arranged in a straight line in the stacking direction of the stacked cores 21. The main iron core portion 8112 is disposed on the inner peripheral side of the laminated iron core 21 during lamination, and the teeth portion 8113 faces the inner peripheral side of the laminated iron core 21. The auxiliary iron core portion 8111 is disposed on the outer peripheral side of the laminated iron core 21 during lamination.

  A first notch 812 is formed between adjacent secondary iron core portions 8111, and a second notch 813 is formed between adjacent main iron core portions 8112. As a result, a connecting portion 814 having a narrow radial width is formed at the boundary between the secondary iron core portion 8111 and the main iron core portion 8112. Here, as an example, all the first notches 812 formed in the strip-shaped iron core 81 have the same shape, and all the first notches 813 formed in the strip-shaped iron core 81 also have the same shape. As described above, since the connecting portions 814 are arranged in a straight line in the stacking direction, the first notch 812 expands during stacking to form a groove 815 extending in the stacking direction as shown in FIG. The groove 815 is formed on the outer peripheral surface of the laminated iron core 21 at a position where the connecting portion 814 is provided. Moreover, the sub iron core part 8111 forms the axial direction fin extended in the lamination direction. In FIG. 2, reference numeral 8114 denotes an outer peripheral portion of the secondary iron core portion 8111.

  As described above, according to this embodiment, the laminated iron core 21 is manufactured by laminating the belt-like iron core 81 in a spiral shape. Thereby, the usage-amount of a steel plate can be reduced compared with the case where the laminated iron core is manufactured by laminating | stacking the annular core punched out from the steel plate. A groove 815 is formed on the outer peripheral surface of the laminated iron core 21. Thereby, the cooling efficiency of the laminated iron core 21 can be improved more than before.

  In addition, according to the present embodiment, the first notch 812 is widened at the time of stacking to form the groove 815. For this reason, in designing the width of the groove 815 in the circumferential direction of the laminated core 21 to be a predetermined width that can achieve a desired cooling efficiency, the opening width of the first notch 812 can be set to a width smaller than the predetermined width. it can. For this reason, there is also an advantage that the press die for forming the first notch 812 can be reduced in size and simplified.

  Moreover, according to the present Example, each core piece 811 is the same structure, and the connection part 814 is provided in each core piece 811. FIG. For this reason, the interval between adjacent notches 812 is also the same, and the grooves 815 are arranged in the circumferential direction of the laminated core 21 at the same interval. Thereby, it can suppress that the cooling efficiency of the laminated iron core 21 deteriorates locally. Further, in the present embodiment, the shape of the first notch 812 is the same in the belt-like iron core 81. For this reason, all the grooves 815 have the same shape, and the laminated core 21 can be cooled evenly.

  In the above description, the plurality of tooth portions 8113 are formed in the main iron core portion 8112. However, the present invention is not limited to this. As shown in FIG. 3, the number of teeth portions 8113 formed in the main iron core portion 8112 may be one. FIG. 3 is a diagram illustrating another configuration example of the iron core piece. In FIG. 3, the strip-shaped iron core 81a is formed of a plurality of core pieces 811a punched out from the strip-shaped steel plate 100 by press working and connected to each other by a connecting portion 814a. Each iron core piece 811a is substantially arc-shaped. Each iron core piece 811a is constituted by a sub iron core portion 8111a for forming an axial fin and a main iron core portion 8112a in which one tooth portion 8113 is formed. Each iron core piece 811a is formed with as many teeth 8113 as the multiple of the total number of teeth 8113 of the laminated iron core 21. For this reason, the connecting portions 814 a are arranged in a straight line in the stacking direction of the stacked cores 21. The main iron core portion 8112a is arranged on the inner peripheral side of the laminated iron core 21 during lamination, and the teeth portion 8113 faces the inner peripheral side of the laminated iron core 21. The auxiliary iron core portion 8111a is disposed on the outer peripheral side of the laminated iron core 21 during lamination. A first notch 812a is formed between adjacent secondary iron core portions 8111a, and a second notch 813a is formed between adjacent main iron core portions 8112a. As a result, a connecting portion 814a having a narrow radial width is formed at the boundary between the secondary iron core portion 8111a and the main iron core portion 8112a. As described above, since the connecting portions 814a are arranged in a straight line in the stacking direction, the first notch 812a spreads during stacking to form a groove extending in the stacking direction. The groove is formed on the outer peripheral surface of the laminated iron core 21 at a position where the connecting portion 814a is provided. Moreover, the sub iron core part 8111a forms the axial direction fin extended in the lamination direction.

  Further, in the above description, nothing is formed on the outer peripheral portion 8114 of the secondary iron core portion 8111. However, as shown in FIG. 4, a third notch 816 serving as a groove may be further formed on the outer peripheral portion 8114. FIG. 4 is a diagram illustrating another configuration example of the iron core piece. FIG. 4 is different from FIG. 2 in that the belt-shaped iron core 81 is replaced with the belt-shaped iron core 81b, the auxiliary iron core portion 8111 is replaced with the auxiliary iron core portion 8111b, the connecting portion 814 is replaced with the connecting portion 814b, and a third notch 816 is further formed. It is different in point. The 3rd notch 816 is formed in the same position with respect to each sub iron core part 8111b. Accordingly, since the connecting portions 814b are arranged in a straight line in the stacking direction, the third notch 816 forms a groove extending in the stacking direction when stacked. As a result, the surface area of the laminated iron core 21 is further increased, and the cooling efficiency is further increased. In FIG. 4, for example, the third notch 816 is arranged at the center between the first notches 812. As a result, the groove 815 formed by the first notch 812 and the groove formed by the third notch 816 are arranged in the circumferential direction of the laminated core 21 at the same interval. As a result, local deterioration of the cooling efficiency of the laminated core 21 can be suppressed. Furthermore, the shape of the third notch 816 is different from the shape of the first notch 812 by the opening angle, and the opening angle of the third notch 816 is set to the opening angle of the first notch 812 after lamination. Thereby, all the grooves have the same shape, and as a result, the laminated iron core 21 can be cooled evenly. A plurality of third cutouts 816 may be formed for one sub iron core portion 8111b.

21, 51 Laminated core 100 Strip steel plates 81, 81a, 81b Strip iron cores 511, 811, 811a, 811b 1 notch 813, 813a 2nd notch 512, 814, 814a connecting part 815 groove 816 3rd notch

Claims (4)

An annular laminated iron core formed by spirally laminating a plurality of iron core pieces connected to each other by a connecting portion,
Each of the core pieces is provided on the inner peripheral side of the laminated core, and a main core portion having a tooth portion formed on the inner peripheral side, and a sub-core portion provided on the outer peripheral side of the main core portion, And connected to each other by the connecting portion provided at the boundary between the main iron core and the sub iron core,
A laminated core in which a groove extending in the laminating direction of the laminated core is formed at a position on the outer peripheral surface of the laminated core where the connecting portion is provided by arranging the connecting parts in the laminating direction of the laminated core. .   The laminated core according to claim 1, wherein each groove has the same shape. A groove extending in the laminating direction of the laminated core is further formed at a position different from the position where the connecting portion is provided on the outer peripheral surface of the laminated core,
The laminated core according to claim 1, wherein the grooves are arranged at equal intervals in the circumferential direction of the laminated core.   The laminated iron core according to claim 3, wherein each groove has the same shape.

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