JP2008219030A - Iron core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a low-cost iron core and its manufacturing method by a coupling method which reguires no welding, no pins or the like in coupling of sheets of their laminated iron core, and also enable position precision between split iron cores to be increased at a low cost in the iron core of coupled ones. <P>SOLUTION: The laminated iron core of sheets 1 keeps respective sheets 1a, 1b, 1c and 1d coupled by forming isolation strips 2a, 2b and 2c isolated by half blanking return which changes it into a half blanking state with press to return the half blanking state 1 (1a, 1b and 1c) inside the sheet 1 (1a, 1b and 1c) in the sheet 1 (1a, 1b and 1c), by engaging the isolation strips 2a, 2b and 2c inside the hole of the adjacent sheet, and by allowing the engaged isolation strips 2a, 2b and 2c to straddle the adjacent sheets. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to iron cores such as electric motors and transformers, and more specifically, stacks sheets such as steel plates, and forms a core that combines stacked sheets, or a split core that stacks sheets such as steel plates. The invention relates to an iron core obtained by joining divided iron cores.

  The conventional coupling method in the iron core is welding, or as shown in Patent Document 1, a sheet such as a steel plate provided with a through hole is laminated to form a laminated iron core, and the through hole is another part. Sheets are joined together by inserting pins, or a split iron core with a connecting part having a through-hole is formed, and by inserting a pin that is another part into the through-hole of the connecting part, the split iron cores are joined together Combined.

Japanese Patent Laying-Open No. 2003-52138 (pages 3 to 4, FIGS. 1 to 6)

  As described above, the conventional coupling method in the iron core requires a dedicated welding machine, and there is a problem that the cost is increased.

  In addition, when inserting a pin into a through hole, it must be inserted between a long distance from the top to the bottom of the through hole, and the pin may be gnawed while the pin is being inserted. Therefore, there is a problem that the surface finish and outer diameter of the pin must be maintained with high accuracy.

  Moreover, when the positional accuracy between adjacent division | segmentation iron cores is required, it is necessary to make the clearance of a pin and a through-hole high, and there exists a problem that cost becomes high as a result.

  The present invention has been made to solve the above-described problems, and aims to obtain a low-cost iron core by a welding method that does not require other parts such as welding or pins. It is.

  Moreover, it aims at obtaining the iron core which can make the position accuracy between division | segmentation iron cores highly accurate at low cost.

The iron core according to the present invention is an iron core formed by laminating sheets,
The sheet has a separation piece separated from the sheet into a predetermined shape, and a hole having the predetermined shape,
While laminating the plurality of sheets so that the holes of the predetermined shape communicate coaxially,
The separation pieces corresponding to the sheets are fitted into the holes of the predetermined shape so as to straddle between the sheets adjacent in the stacking direction, and the sheets are joined to each other.

  According to the iron core according to the present invention, since the sheets are joined to each other by the separated piece obtained by separating the sheet, extra members such as welding and pins are not required, and the cost can be reduced.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a first embodiment of the iron core according to the present invention. As shown in FIG. 1, a sheet 1 made of a steel plate or the like is laminated, and a separation piece 2 (2a, 2b, 2c) having a columnar shape or the like separated and formed on each sheet 1a, 1b, 1c by half-drawing described later. Are formed in the holes, and the holes of the sheets 1a, 1b, 1c, and 1d are coaxially connected, and the separation pieces 2 (2a, 2b, and 2c) are the sheets 1a and 1b, the sheets 1b and 1c, and the sheet 1c, respectively. And 1d, the sheets 1 that are adjacent to each other are joined together. In this example, the separation piece 2 is not provided on the sheet 1d, but the separation piece 2 may be provided on the sheet 1d.

  FIG. 2 is a cross-sectional view showing a process of manufacturing the iron core shown in FIG. A manufacturing process is demonstrated according to a figure.

  First, as shown in FIG. 2A, the separation piece 2 and the hole in a half-punched state are formed in the sheet 1 with a mold.

  Next, as illustrated in FIG. 2B, the separation piece 2 separated from the sheet 1 is formed in the hole of the sheet 1 by returning the separation piece 2 in the half-drawn state into the hole of the sheet 1. . The process shown in FIGS. 2A and 2B is referred to as half extraction.

  Next, as shown in FIG. 2C, the sheets 1a, 1b, 1c on which the separation pieces 2 are formed and the sheet 1d on which the separation pieces 2 are completely punched are stacked.

  Next, as shown in FIG. 2 (d), the separation piece 2a is pressed with a punch, the separation pieces 2 (2a, 2b, 2c) are fitted into the holes of the adjacent sheets, and the separation pieces 2 (2a, 2a, 2b, 2c) straddles between the sheets 1a and 1b, the sheets 1b and 1c, and the sheets 1c and 1d, respectively.

  As described above, the separation piece 2a joins the sheets 1a and 1b, the separation piece 2b joins the sheets 1b and 1c, the separation piece 2c joins the sheets 1c and 1d, and the sheets 1a, 1b, An iron core in which 1c and 1d are coupled is obtained.

  According to this Embodiment 1, other parts, such as a welding machine or a pin, are not required, and cost can be reduced.

  In addition, since the separation pieces 2a and 2b are fitted into the holes so as to straddle between the adjacent sheets 1a and 1b, the surface finish, clearance accuracy, etc. are taken into consideration as in the case of using pins. do not have to.

  In addition, in the example of FIG.1 and FIG.2, although the example which piled up the sheet | seat 1 was shown, it is not restricted to this, The same iron core can be manufactured by overlapping required several sheets. .

Embodiment 2. FIG.
FIG. 3 is a sectional view showing a second embodiment of the iron core according to the present invention. In the second embodiment, divided cores formed by stacking sheets are joined to each other.

  As shown in FIG. 3, the split iron core 3 a is formed by stacking sheets 1 a so as to form the protruding portions 4 a that are alternately connected portions, and similarly, the split iron core 3 b is the protruding portions that are alternately connected portions. The sheets 1b are stacked so as to form 4b. The protruding portion (connecting portion) 4a and the protruding portion (connecting portion) 4b overlap each other. Each protruding portion 4a, 4b is provided with a cylindrical separation piece 2a, 2b, and the separating pieces 2a, 2b are fitted into adjacent sheet holes so as to straddle between the adjacent protruding portions 4a, 4b. And adjacent protrusion part 4a, 4b is couple | bonded. The split iron core 3a and the split iron core 3b are connected by the connection between the projecting portions 4a and 4b.

  FIG. 4 is a cross-sectional view for explaining the joining process of the split iron cores 3a and 3b in the second embodiment. As shown in FIG. 4A, the separation pieces 2a and 2b are formed by half-removal similarly to the first embodiment, and as shown in FIG. 4B, the separation cores 3a and 3b are separated. After the protrusions 4a and 4b are overlapped with each other, as shown in FIG. 4 (c), the separation piece 2a is pressurized with the punch 5, and the separation pieces 2a and 2b are fitted into the holes of the adjacent sheets, It is made to straddle between protrusion part 4a, 4b.

  As described above, the separation pieces 2a and 2b connect the protruding portions 4a and 4b, and an iron core in which the divided core 3a and the divided core 3b are combined is obtained.

  According to the second embodiment, other parts such as a welding machine or a pin are not required, and the cost can be reduced.

  In addition, since the separation pieces 2a and 2b are fitted into the holes of the adjacent sheets and joined so as to straddle between the protrusions 4a and 4b, the surface finish and clearance accuracy are the same as when using pins. The position accuracy of the split iron cores 3a and 3b can be made high without having to consider the above.

  In the second embodiment, the protruding portion is formed by one sheet. However, as shown in FIG. 5, the protruding portions (three in the drawing) in which the sheets 1a and 1b are overlapped ( (Connection part) 4a, 4b may be formed.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view showing a third embodiment of the iron core according to the present invention, and the same reference numerals as those in the second embodiment denote the same or corresponding parts.

  In Embodiment 2 described above, the separation pieces are provided on all the sheets, but it is not always necessary to provide the separation pieces on all the sheets. For example, when each sheet of the split iron core is joined by caulking or separation pieces at a position other than the connecting portion as in the first embodiment, as shown in FIG. There may be sheets 1a and 1b that are not provided with 2a and 2b, and the divided core 3a and the divided core 3b are joined at a connecting portion between the upper and lower sheets 1a and 1b of the sheets 1a and 1b.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view showing a fourth embodiment of the iron core according to the present invention, and the same reference numerals as those in the second embodiment denote the same or corresponding parts.

  When the number of sheets to be stacked is large, the pressing force that presses the separation pieces 2a and 2b with a punch increases, and a large press may be required.

  In such a case, as shown in FIGS. 7A and 7B, a joined body is formed by joining a small number of divided cores 3a and 3b, and as shown in FIG. One combined body has the separating pieces 2a or 2b protruding downward, and as shown in FIG. 7 (c), the protruding separating pieces 2a or 2b are fitted into the holes of the other combined body to obtain a large number of sheets. An iron core made of the sheets 1a, 1a ′, 1b, 1b ′ can be produced.

  According to the fourth embodiment, even when the number of stacked sheets is large, it is possible to reduce the pressure applied to press the separation pieces 2a and 2b with a punch.

  Note that although FIG. 7 shows the case where there are two conjugates, even when there are three or more conjugates, the conjugates can be joined in the same manner as in the case of two.

Embodiment 5. FIG.
FIGS. 8 to 13 are diagrams showing specific examples of the iron core obtained by the coupling methods of Embodiments 2 to 4, FIGS. 8A and 8C are plan views, and FIGS. d) are AA and BB sectional views, FIGS. 9A and 9C are plan views, FIG. 9B is an AA sectional view, and FIGS. 10 and 11 are plan views. (A) is a top view, FIG.12 (b) is AA sectional drawing, FIG. 13 is a top view. The same reference numerals as those in Embodiment 2 denote the same or corresponding parts.

  FIG. 8 is an example of a rectangular iron core. As shown in FIGS. 8A and 8B, a split iron core 6 is produced by stacking a plurality of strip-shaped sheets 1 so as to provide protrusions 4 on both sides in the longitudinal direction. Each protruding part 4 is formed with a rectangular separating piece 2.

  As shown in FIGS. 8C and 8D, the projecting portions 4 of the laterally divided core 6a and the longitudinally divided core 6b are fitted into the gap between the projecting portions 4, and the separating pieces 2a, 2b is pressed with a punch to obtain a rectangular iron core to which the divided iron cores 6a and 6b are coupled.

  In FIG. 8, since the separation pieces 2a and 2b are rectangular, the divided iron cores 6a and 6b are not rotated and the rectangular shape is maintained.

  FIG. 9 is an example of a stator of a rotating electrical machine. As shown in FIGS. 9A and 9B, one end surface is a semicircular convex portion 6e, and the other end surface is a semicircular concave portion 6f that fits with the semicircular convex portion 6e. The sheet 1 having the yoke portion 6d in which the rectangular separating piece 2 is formed on the convex portion 6e and the magnetic teeth 6c protruding from the central portion of the yoke portion 6d, the semicircular convex portions 6e are alternately reversed. The divided iron cores 6 stacked in such a manner are produced.

  As shown in FIG. 9 (c), the semicircular convex portions 6e and the semicircular concave portions 6f of the yoke portion 6d in the adjacent divided iron cores 6 are fitted and sequentially arranged in a circular shape, so that the separation piece 2 Is pressed with a punch to obtain a stator core in which the divided cores 6 are joined together.

  In FIG. 9, since the separation piece 2 is rectangular, the divided iron core 6 is not rotated and the circular shape is maintained.

  FIG. 10 shows another example of the stator of the rotating electric machine. In FIG. 10, the split core 6 has the same shape as the example of FIG. 9, but the split core 6 is linearly connected by a caulking portion 7 and separated into semicircular convex portions 6 e of the split core 6 at both ends. A piece 2 is formed. The split iron cores 6 can be bent at the crimping portion 7.

  As shown in FIG. 11, the segmented iron cores 6 connected in a straight line are bent at a caulking portion 7 to be circular, the semicircular convex portions 6e at both ends are overlapped with each other, and the separation piece 2 is added by a punch. To obtain an iron core in which rows of the divided cores 6 connected in a straight line are connected in a circle.

  FIG. 12 is an example of a ring-shaped iron core. As shown in FIG. 12, the arc-shaped one end surface is a semicircular convex portion 6e, and the other end surface is a semicircular concave portion 6f fitted with the semicircular convex portion 6e, which is a semicircular convex portion 6e. A split iron core 6 is prepared by stacking the sheets 1 on which the circular separation pieces 2 are formed so that the semicircular convex portions 6e are alternately reversed.

  The stator cores in which the semicircular convex portions 6e and the semicircular concave portions 6f in the adjacent divided cores 6 are fitted, arranged sequentially in a circle, and the separation pieces 2 are pressed with a punch to join the divided cores 6 together. Get.

  In the ring-shaped iron core shown in FIG. 12, the split cores 6 are connected to each other by three separation pieces 2, and the split cores 6 are bent at the connecting portion, arranged on a straight line, and the coil is wound. Thereafter, the separated pieces 2 are joined so that the divided iron cores 6 are arranged in a circle, and a circular iron core can be obtained. Here, the winding work is facilitated by arranging the divided iron cores 6 on a straight line.

  13A is an example in which the separation piece 2 is made circular in FIG. 8, and FIG. 13B is an example in which the separation piece 2 is made circular in FIG. In FIG. 13A, since the divided iron cores 6a and 6b are rotated at the joint portion of the separation piece 2 and can be wound in a straight line, the winding work is facilitated. Further, in FIG. 13B, the split iron cores 6a and 6b are rotated at the connecting portion of the separating piece 2 to reverse the circle, so that the space between the magnetic teeth 6c around which the coil is wound can be greatly widened. Work becomes easy.

  The iron core according to the present invention can be effectively used for rotating electric machines such as motors and iron cores such as transformers.

It is sectional drawing which shows Embodiment 1 in the iron core which concerns on this invention. It is sectional drawing which shows the process of manufacturing the iron core shown in FIG. It is sectional drawing which shows Embodiment 2 in the iron core which concerns on this invention. FIG. 6 is a cross-sectional view illustrating a split iron core joining step in the second embodiment. It is sectional drawing which shows another form of Embodiment 2 in the iron core which concerns on this invention. It is sectional drawing which shows Embodiment 3 in the iron core which concerns on this invention. It is sectional drawing which shows Embodiment 4 in the iron core which concerns on this invention. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4. It is a figure which shows the specific example of the iron core obtained by the coupling | bonding method of Embodiment 2 thru | or 4.

Explanation of symbols

1, 1a, 1a ′, 1b, 1b ′, 1c, 1d sheet, 2, 2a, 2c separation pieces,
3, 3a, 3b Split iron core, 4, 4a, 4b Projection, 5 Punch,
6, 6a, 6b Iron core, 6c magnetic pole teeth, 6d yoke part, 6e convex part, 6f concave part,
7 Caulking club.

Claims (6)

In iron cores made by laminating sheets,
The sheet has a separation piece separated from the sheet into a predetermined shape, and a hole having the predetermined shape,
While laminating the plurality of sheets so that the holes of the predetermined shape communicate coaxially,
An iron core, wherein the separation pieces corresponding to the sheets are fitted into the holes of the predetermined shape so as to straddle between the sheets adjacent in the stacking direction, and the sheets are coupled to each other. The iron core is formed by combining a plurality of divided iron cores in which sheets are stacked, and forms a connecting portion for the connection in which the sheet end portions of the split iron core are overlapped with each other. The iron core according to claim 1, wherein a separation piece is formed. 3. The iron core according to claim 2, wherein the sheets of the divided iron cores are joined to each other at a position other than the connecting portion, and the separation pieces are not formed on a plurality of the sheets. 3. The iron core according to claim 2, wherein sheet end portions of the split iron core are alternately overlapped with each other, and the separation piece is formed on each of the sheet end portions. The iron core according to claim 1, wherein the separation piece is a circular column. The iron core according to any one of claims 1 to 4, wherein the separation piece is a polygonal column.

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