JP2013027104A - Method of manufacturing laminated core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core to which resin sealing can be applied without causing resin leakage, even if there is a difference in height or a slight inclination depending on the position of a magnet insertion hole in a laminated core body or on the upper and lower surfaces of the laminated core body.SOLUTION: In this method of manufacturing the laminated core, the laminated core body 23 in which a permanent magnet 37 is inserted in a magnet insertion hole 31 formed side by side in a circumferential direction is disposed between a pressurizing plate 39 and a holding plate 36, and a molten resin 47 is filled into the magnet insertion hole 31 by resin discharge means provided in the pressurizing plate 39. The resin discharge means has a resin pot block 41 provided from the pressurizing plate 39 to the laminated core body side through a spring 40, and a caul plate 38 for guiding the resin 47 pushed out from the resin pot block 41 by a plunger 46 to the magnet insertion hole 31, and one side of the caul plate 38 adheres closely to the resin injecting side face (top face) of the laminated core body 23 to prevent resin leakage.

Description

The present invention provides a laminated core body in which annular core pieces are laminated or a laminate in which permanent magnets (including non-magnetized ones) are resin-sealed in magnet insertion holes of a laminated core body in which strip-like core pieces are spirally wound and laminated. The present invention relates to a method for manufacturing an iron core.

Patent Document 1 discloses that a permanent magnet is put in a magnet insertion hole of a laminated core body formed by caulking and laminating annular core pieces and resin-sealed. In Patent Document 1, a dummy plate (culplate) is arranged on a laminated core body, and molten resin from a resin reservoir provided in an upper mold is filled into a magnet insertion hole through the dummy plate. Yes.

Patent Document 2 discloses that a laminated core body is manufactured by spirally winding a strip-shaped core piece in which segment core pieces having a plurality of magnetic pole pieces are connected by a connecting portion. It is described that a plurality of magnet insertion holes are formed in the radially outer region of the laminated core body, and permanent magnets are inserted into the magnet insertion holes and sealed with resin.

JP 2008-54376 A JP 2009-1000051 A

When resin-sealing the permanent magnets in all of the magnet insertion holes of the laminated core body as described in Patent Document 2, as shown in FIG. 12, at the beginning and end of winding of the strip-shaped core piece 70, There is a step 71, and the laminated core main body 72 has a spiral inclination that the upper and lower surfaces are not perpendicular to the outer periphery but a round (in the case of a single winding) in the circumferential direction, and a resin reservoir pot is provided. Even if pressed by a mold (usually an upper mold), resin leakage will occur from the gap formed between the mold and the laminated core body. Therefore, jigs (dummy plates) 75 and 76 having appropriate steps 73 are provided. I need. Here, 78 indicates a resin reservoir pot, and 79 indicates a magnet insertion hole.
In addition, even in a laminated core body in which annular core pieces are laminated, the thickness of the iron core pieces is not uniform. Therefore, even if the pressing surface to the laminated core body of the upper die or the lower die is flat, resin leakage may occur. There was a problem that there was.

The present invention has been made in view of such circumstances, and even if there is a difference in height or some inclination depending on the position of the magnet insertion hole on the upper and lower surfaces of the laminated core body or the laminated core body, resin leakage occurs. It aims at providing the manufacturing method of the laminated iron core which can be resin-sealed.

According to the first aspect of the present invention, there is provided a method for manufacturing a laminated core, wherein a laminated core body in which a permanent magnet is inserted into a magnet insertion hole formed in a circumferential direction is disposed between a pressure plate and a holding plate. In the method of manufacturing a laminated core in which the magnet insertion hole is filled with the resin melted by the resin discharge means provided on the pressure plate,
The resin discharging means includes a resin pot block provided on the laminated core body side from the pressure plate via a spring, and a culplate for guiding the resin pushed out from the resin pot block by a plunger to the magnet insertion hole. And filling the resin with one surface of the cull plate in close contact with the resin injection side surface of the laminated core body.

A method for manufacturing a laminated core according to a second invention is the method for producing a laminated core according to the first invention, wherein the resin pot block is provided with a resin pot sleeve penetrating to the pressure plate, and the plunger The resin pot sleeve is moved up and down.

A method for manufacturing a laminated core according to a third aspect is the method for producing a laminated core according to the first and second aspects, wherein the cull plate and the resin pot block are made of an annular plate.

A method for manufacturing a laminated core according to a fourth invention is the method for producing a laminated core according to the third invention, comprising a main shaft penetrating the laminated core body between the laminated core body and the holding plate, A lower plate for closing the magnet insertion hole is provided.

A method for manufacturing a laminated core according to a fifth aspect is the method for producing a laminated core according to the first and second aspects, wherein the cull plate is divided into one or a plurality of adjacent magnet insertion holes.

A method for manufacturing a laminated core according to a sixth aspect is the method for producing a laminated core according to the fifth aspect, wherein the resin pot block is divided together with the cull plate.

A method for manufacturing a laminated core according to a seventh aspect is the method for producing a laminated core according to the fifth and sixth aspects, wherein the laminated core body includes a segment core piece having one or a plurality of magnetic pole pieces as a connecting portion. It is a wound core body formed by bending connected strip-shaped core pieces at the connecting portion.

A method for manufacturing a laminated core according to an eighth invention is the method for producing a laminated core according to the seventh invention, wherein the wound core body is produced by winding the strip-shaped core piece around a lower mold plate having a main shaft at the center. .

And the manufacturing method of the laminated iron core which concerns on 9th invention is a manufacturing method of the laminated iron core which concerns on 8th invention. It has a linear protrusion in the circumference | surroundings of the said main axis | shaft, and has the inside of the said strip | belt-shaped core piece. The wound core body is manufactured while meshing with the positioning recess formed in the above.

In the method for manufacturing a laminated core according to the first to ninth inventions, the resin discharge means is extruded from the pressure plate by a plunger from the resin pot block provided on the laminated core body side via a spring, and the resin pot block. Since the resin plate has a cull plate for guiding the resin to the magnet insertion hole, the cull plate is brought into close contact with the resin injection side surface of the laminated core body, thereby preventing resin leakage.

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In particular, in the method for manufacturing a laminated core according to the second invention, the resin pot block is provided with a resin pot sleeve that penetrates to the pressure plate, and the plunger moves up and down in the resin pot sleeve. There is no resin leakage between the pot block.

In the method for manufacturing a laminated core according to the third aspect of the invention, the cull plate and the resin pot block are made of annular plates, so that they can be easily attached and detached. Suitable for laminated core body without corresponding steps.

In the method for manufacturing a laminated core according to the fourth aspect of the present invention, a lower mold plate is provided between the laminated core body and the holding plate, the main plate penetrating the laminated core body and closing the magnet insertion hole. The resin leakage of the core body can be eliminated with the lower mold plate.

In the method for manufacturing a laminated core according to the fifth aspect of the invention, since the cull plate is divided into one or a plurality of adjacent magnet insertion holes, the cull plate is more accurately applied to the surface of the laminated core body having different heights and inclinations. Resin leakage can be prevented individually.

In the method for manufacturing a laminated core according to the sixth aspect of the invention, since the resin pot block is divided together with the cull plate, the surface of the laminated iron core body, the surface of the cull plate and the resin pot block can be combined, Leakage can be prevented more reliably.

In the method for manufacturing a laminated core according to the seventh aspect of the invention, the laminated core is formed by bending a strip-shaped core piece in which the laminated core body has one or more magnetic pole piece parts connected at the connecting part and bending at the connecting part. Since it is a main body, it has a level | step difference in the upper and lower surfaces of a laminated core main body, and is especially suitable for the manufacturing method of the laminated core which concerns on 5th, 6th invention.

In the method for manufacturing a laminated core according to the eighth aspect of the invention, the wound core body is manufactured by winding the strip-shaped core piece around the lower mold plate having the main shaft at the center, and therefore the manufacture of the wound core body is facilitated.

And in the manufacturing method of the laminated core which concerns on 9th invention, it has a linear protrusion with the predetermined pitch around the main axis | shaft, and it engages with the positioning recessed part formed inside a strip | belt-shaped core piece, Since it manufactures, manufacture of a wound core main body is attained, winding up a strip | belt-shaped core piece reliably.

It is a partially omitted sectional view showing a method for manufacturing a laminated core according to the first embodiment of the present invention. (A), (B) is a perspective view which shows the manufacturing method of the laminated core, (C) is a perspective view of the laminated core main body which applies the manufacturing method of the laminated core. (A), (B) is a front view which shows the manufacturing method of the laminated core. It is a top view of the resin pot block used for the manufacturing method of the laminated core. It is a top view of the cull plate used for the manufacturing method of the laminated core. (A), (B) is explanatory drawing of the manufacturing method of the same laminated iron core, respectively. (A), (B) is a perspective view which shows the manufacturing method of a laminated core main body, respectively. (A), (B) is a top view which shows the manufacturing method of the laminated core main body which concerns on another example, respectively. (A), (B) is a front view which shows the manufacturing method of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is a top view of the resin pot block used for the manufacturing method of the laminated core. It is a top view of the cull plate used for the manufacturing method of the laminated core. It is a perspective view which shows the manufacturing method of the laminated iron core used as the foundation of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
FIGS. 7A, 7B, and 7C show a method for manufacturing the laminated core bodies 23 and 29 (see FIGS. 2 and 8) applied to the method for producing the laminated core according to the first embodiment of the present invention. Description will be made with reference to FIGS.
As shown in FIG. 7 (B), a strip-shaped strip made of a magnetic steel plate is connected in a straight line through a connecting portion 13 in which a segment core piece 12 having one or a plurality of magnetic pole piece portions 11 can be bent. The core pieces 14 and 15 are formed by punching.

The unwinding ends of the strip-shaped core pieces 14 and 15 are placed on the lower mold plate 18 so as to coincide with the steps 19 and 20 provided on the lower mold plate 18 having the main shaft 17 at the center. In this state, while the positioning recess 22 formed on the inner side of the annular core piece bent by the connecting portion 13 is engaged with the linear protrusions 23a provided at a predetermined pitch around the main shaft 17, the lower mold The main shaft 17 is rotated together with the plate 18. In addition, it is preferable to temporarily clamp the strip-shaped core pieces 14 and 15 to the lower mold plate 18 at the stage of starting the winding of the strip-shaped core pieces 14 and 15.

By gradually rotating the main shaft 17, the strip-shaped core pieces 14 and 15 are gradually wound around the main shaft 17 in a direction tangentially opposite to each other to produce a laminated core body (winding core body) 23. In this case, when the segment core pieces 12 of the strip-shaped core pieces 14 and 15 are overlapped at exactly the same phase, the positions of the connecting portions 13 of the strip-shaped core pieces 14 and 15 are also overlapped. Just shift. Thereby, the position of the connection part 13 of the upper and lower iron core pieces of the laminated core body 23 does not overlap, and a strong laminated core body 23 can be formed. A through hole 24 is provided in the center of the main shaft 17 and is connected to a rotation drive source (not shown) that rotates the main shaft 17.

Since the laminated core body 23 shown in FIG. 7 has two strips of the core pieces 14 and 15 wound, two steps 26 and 27 (see FIG. 2C) are formed on the upper surface of the laminated core body 23. . In this example, the laminated core body 23 is formed using two (a plurality of) strip-shaped core pieces 14 and 15, but as shown in FIG. 8, only one strip-shaped core piece 14 is used to form a wound laminated core. The body 29 can also be formed. Even in this case, it is the same to manufacture the laminated core body 29 using the lower mold plate 18 having the main shaft 17. In this case, only one step is formed above and below the laminated core body 29, and one step corresponding to this is formed on the lower mold plate 18. In addition, the end portions of the strip-shaped core pieces 14 and 15 are always formed at the position of the connecting portion 13 regardless of whether the winding is one or two.

The laminated core bodies 23 and 29 have a through hole 30 at the center, a plurality of magnet insertion holes 31 formed in the circumferential direction around the center, and a through hole 32 on the inner side. Are common. Then, as shown in FIG. 8A, a concave portion 33 and a convex portion 34 are formed at the ends of the adjacent segment core pieces 12, and the convex portion 34 is fitted into the concave portion 33 during assembly, and the adjacent segment cores A separation line 35 is formed on the piece 12 toward the connecting portion 13. The description of the separation line 35 is omitted in FIG.

Subsequently, referring to FIGS. 1, 2 </ b> A to 2 </ b> C, 3 </ b> A, 3 </ b> B, and 4 to 6, the laminated core body 23 (the same applies to the laminated core body 29). A method for manufacturing a laminated iron core according to the first embodiment of the present invention in which permanent magnets 37 are inserted into the magnet insertion holes 31 to perform resin sealing will be described.
The laminated core body 23 placed on the lower mold plate 18 functioning as a conveying jig is positioned and placed on the holding plate 36. A permanent magnet (including an unmagnetized one) 37 is inserted into the magnet insertion hole 31 of the laminated core body 23. In this case, the cull plate 38 is placed on the laminated core body 23. Then, in this state, a resin pot block 41 that is positioned and placed on the cull plate 38 and attached to the pressure plate 39 via a coil spring (an example of a spring) 40 is placed. The lower mold plate 18 closes the lower part of the magnet insertion hole 31 of the laminated core body 23.

The cull plate 38 is divided into a plurality for each magnet insertion hole 31 serving as a magnetic pole portion, and the resin pot block 41 is also divided into a plurality corresponding to the cull plate 38. The pressure plate 39 that is circular in plan view has a resin pot sleeve 42 formed of a short tube that penetrates the resin pot block 41 in a penetrating state. A plurality of coil springs 40 are arranged around one resin pot sleeve 42, and a positioning bolt 43 is provided at the center of each coil spring 40 to hold the resin pot block 41 so that it does not fall. Note that the bolt insertion hole 44 formed in the pressure plate 39 becomes a loose hole about 0.5 to 2 mm larger than the diameter of the positioning bolt 43, and the resin pot block 41 and the culplate 38 just below the laminated iron core. The main body 23 has a structure that can be tilted according to the surface around the magnet insertion hole 31. In FIG. 4, reference numeral 44a denotes a female screw hole. As shown by the alternate long and short dash line in FIG. 8B, the culplate 38a may be divided into a plurality of (two or more) adjacent magnet insertion holes 31. In this case, the cull plate located at the step at the end of winding of the strip-shaped iron core piece is cut so as to coincide with the step.

The resin pot sleeve 42 protrudes from the upper surface of the pressure plate 39, and has a plunger 46 that can be moved up and down. The melted resin 47 in the resin pot sleeve 42 is passed through the resin injection hole 48 of the cull plate 38. The magnet insertion hole 31 can be filled. As a result, even if there is a step or inclination on the surface of the laminated core body 23, the cull plate 38 can respond flexibly, and the resin pot block 41 also corresponds to this, and as a result, the lower surface of the cull plate 38 is laminated. The resin can be sealed without being leaked by being in close contact with the upper surface of the core body 23. A resin pot block 41, a cull plate 38, a resin pot sleeve 42, and a plunger 46 for pushing out the resin in the resin pot sleeve 42 are provided below the pressure plate 39 via a coil spring 40. Resin discharging means is configured.

When removing the resin pot block 41 from the laminated core body 23, the pressure plate 39 is raised. In this case, since the cull plate 38 is pressed to the laminated core body 23 side by the coil spring 40 provided in the resin pot block 41 at the initial rise of the pressure plate 39, the cull plate 38 is pressed to the laminated core body 23. The resin pot sleeve 42 fixed to the pressure plate 39, the resin pot block 41, and the resin pot block 41 is raised.

The cull plate 38 remaining on the laminated core body 23 is conveyed from the holding plate 36 to a different position together with the lower mold plate 18 in a state where the cured resin tub remains, and is conveyed onto a work table (not shown). Then, as shown in FIGS. 1, 6 (A), (B), it is removed by the calplate removing members 49, 50. The cull plate removing members 49 and 50 advance and retreat in the radial direction (shown by arrows a and b in FIG. 6A), and the cull plate removing members 49 and 50 move away from the laminated core body 23, respectively. In this state, the cull plate removing members 49 and 50 are moved up and down (shown by arrows c and d in FIG. 6 (A)). As shown in FIG. 1, the main shaft 17 is provided with a notch 52 into which a cull plate removing member 49 can be inserted.

The cull plate removing members 49 and 50 have an L-shaped cross section and have a latching portion at the lower portion. As shown in FIG. The cull plate 38 is removed from the laminated core main body 23 (that is, the laminated iron core 51 to be a product) which is hooked on the cull plate 38 from the outside in the direction and the resin sealing is completed. Thereafter, the laminated iron core 51 is removed from the lower mold plate 18.

In this embodiment, the cull plate 38 is removed using the cull plate removing members 49 and 50. However, the cull plate 38 can be removed manually or by a robot hand or a vacuum suction mechanism.
When placing the cleaned cull plate 38 for removing the adhering resin on a predetermined position of the laminated core body 23, each cull plate 38 is mounted on the laminated core body 23 using the cull plate removing members 49 and 50. Alternatively, it may be performed by another handling mechanism or manually.

Alternatively, a vacuum suction hole may be provided at the bottom of the resin pot block 41, and the cull plate 38 may be vacuum-sucked and disposed at the bottom of the resin pot block 41 as shown in FIG.
Each cull plate 38 is preferably provided with a pilot pin and a guide member (not shown) so as to accurately coincide with predetermined positions of the resin pot block 41 and the laminated core body 23.

In any case, as shown in FIG. 3B, the cull plate 38 and the resin pot block 41 are placed on the laminated core body 23 and the laminated core body 23 is pressed by the pressure plate 39. Then, the resin 47 is put into the resin pot sleeve 42 and heated to melt the resin 47, and then the plunger 46 is put into the resin pot sleeve 42, and the melted resin 47 is passed through the resin injection hole 48 of the cull plate 38. Then, the magnet insertion hole 31 is filled with the resin 47, and the internal permanent magnet 37 is sealed with the resin.

Thereafter, the pressure plate 39 is raised and the resin pot block 41 is removed with the cull plate 38 left on the laminated core body 23. Then, in a state of being placed on the lower mold plate 18, the laminated core body 23 is taken out from the holding plate (lower mold) 36 by a conveying means (not shown), the cull plate 38 is removed, the lower mold plate 18 is also removed, and the laminated core 51 is removed. obtain.

Then, the manufacturing method of the laminated core which concerns on the 2nd Embodiment of this invention is demonstrated, referring FIG. 9 (A), (B), FIG. 10, FIG. In this embodiment, the laminated core body 55 is not formed by the laminated core bodies 23 and 29 in which the strip-shaped core pieces 14 and 15 are spirally wound, but is formed by caulking and laminating a predetermined number of donut-shaped annular core pieces 56 in plan view. Has been. Also in this laminated core body 55, the upper surface and the lower surface of the laminated core body 55 are not completely parallel but slightly inclined due to the plate thickness deviation of each annular core piece 56, and the upper surface of the lower mold plate and the lower surface of the upper mold plate However, if resin sealing of the magnet insertion hole is performed using a completely parallel resin sealing device, there will be some resin leakage.

Therefore, a resin pot block 57 as shown in FIG. 10 and a cull plate 58 as shown in FIG. 11 are used. The resin pot block 57 is an annularly integrated resin pot block 41 that is divided for each magnetic pole portion in the first embodiment (annular plate). The cull plate 58 is obtained by integrating the divided cull plate 38 according to the first embodiment in an annular shape. The resin pot sleeve 42 and the coil spring 40 are used as they are.

Therefore, the cull plate 58 and the resin pot block 57 used in this embodiment are inclined according to the inclination of the laminated core body 55, the gap between the lower surface of the laminated core body 55 and the lower mold plate 18, and the laminated core body 55. There is no gap between the upper surface and the cull plate 58, and no resin leakage occurs. Since the other configuration and the manufacturing method of the laminated iron core are the same as the manufacturing method of the laminated iron core according to the first embodiment, detailed description thereof is omitted. Also in this embodiment, a resin pot block and a cull plate divided in the same manner as in the first embodiment may be used.

The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention. For example, in the above embodiment, the resin is directly injected into the magnet insertion hole of the laminated core body from the resin injection hole formed in the calplate, but the resin flow path (runner) is provided in the calplate, and the resin pot sleeve The extruded resin can be filled in one or two magnet insertion holes through the resin flow path.
In the above-described embodiment, the resin pot sleeve is provided on the pressure plate serving as the upper mold, but the resin pot sleeve may be provided on the holding plate and the lower mold plate.

11: magnetic pole piece, 12: segment core piece, 13: connecting part, 14, 15: strip-shaped iron core piece, 17: main shaft, 18: lower mold plate, 19, 20: step, 22: positioning recess, 23a: linear Protrusion, 23: Laminated core body, 24: Through hole, 26, 27: Step, 29: Laminated core body, 30: Through hole, 31: Magnet insertion hole, 32: Extraction hole, 33: Recess, 34: Convex 35: separation line, 36: holding plate, 37: permanent magnet, 38, 38a: cul plate, 39: pressure plate, 40: coil spring, 41: resin pot block, 42: resin pot sleeve, 43: positioning bolt, 44: Bolt insertion hole, 44a: Female screw hole, 46: Plunger, 47: Resin, 48: Resin injection hole, 49, 50: Cull plate removing member, 51: Laminated iron core, 52: Notch, 55: Laminated iron Body, 56: annular core piece, 57: resin pot block, 58: Cal plate

Claims (9)

A laminated core body in which permanent magnets are inserted into magnet insertion holes formed side by side in the circumferential direction is arranged between the pressure plate and the holding plate, and the resin melted by the resin discharge means provided on the pressure plate is used. In the method of manufacturing a laminated core that fills the magnet insertion hole,
The resin discharging means includes a resin pot block provided on the laminated core body side from the pressure plate via a spring, and a culplate for guiding the resin pushed out from the resin pot block by a plunger to the magnet insertion hole. And filling the resin with one surface of the cull plate in close contact with the resin injection side surface of the laminated core body. 2. The laminated iron core manufacturing method according to claim 1, wherein the resin pot block is provided with a resin pot sleeve penetrating to the pressure plate, and the plunger moves up and down in the resin pot sleeve. Manufacturing method of iron core. 3. The method for manufacturing a laminated core according to claim 1, wherein the cull plate and the resin pot block are made of an annular plate. 4. 4. The method of manufacturing a laminated core according to claim 3, wherein a lower mold plate is provided between the laminated core main body and the holding plate, the main plate penetrating the laminated core main body and closing the magnet insertion hole. The manufacturing method of the laminated iron core characterized by the above-mentioned. 3. The method for manufacturing a laminated core according to claim 1, wherein the cull plate is divided into one or a plurality of adjacent magnet insertion holes. 4. 6. The method for manufacturing a laminated core according to claim 5, wherein the resin pot block is divided together with the cull plate. The method of manufacturing a laminated core according to claim 5 or 6, wherein the laminated core body is formed by bending a strip-shaped core piece obtained by connecting segment core pieces having one or a plurality of magnetic pole pieces at a connecting portion. A method of manufacturing a laminated core, which is a wound core body. 8. The method of manufacturing a laminated core according to claim 7, wherein the wound core body is manufactured by winding the strip-shaped core piece around a lower mold plate having a main shaft at the center. 9. The method of manufacturing a laminated core according to claim 8, wherein the wound core body is formed by engaging linear positioning protrusions formed at a predetermined pitch around the main shaft and engaging with a positioning recess formed inside the strip-shaped core piece. A method of manufacturing a laminated iron core, characterized by manufacturing.

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