JP2008113529A - Laminated iron core and method for manufacturing the same - Google Patents

Abstract

Provided is a laminated iron core that can be formed at high density without causing a winding to a magnetic pole to damage an insulating film of the winding and without damaging the winding itself. A plurality of divided core pieces 20 to 22 each having a yoke divided thereon are caulked and laminated, and the widths of the upper end side and the lower end side of the magnetic pole shaft 15 are gradually reduced toward the upper end and the lower end, respectively. In the laminated core obtained by annularly connecting the divided laminated iron cores 10 without the ring via the connecting portions 11 and 12 provided at both ends of the divided laminated iron core 10 and the manufacturing method thereof, the width of the magnetic pole shaft portion 15 on the upper end side of the laminated layer is The split core piece 22 that has been gradually reduced has the pull-out sag 39a facing downward, and the split core piece 20 in which the width of the magnetic pole shaft portion 15 on the lower end of the stack has been gradually decreased has the sag 35a facing upward.
[Selection] Figure 1

Description

The present invention relates to a laminated iron core (particularly, a stator laminated iron core) and a method for producing a laminated iron core that can be wound with high density without causing damage to the insulating coating or the winding itself because the winding is familiar with the magnetic pole.

As shown in FIGS. 7A and 7B, the winding of the laminated core on the magnetic pole can be facilitated by using a divided laminated core 50 in which the yoke is divided for each magnetic pole, and can be wound with high density. It has become. However, since the winding 53 is usually made of copper wire, it can be said that there is workability, but the upper end of the magnetic pole and the lower end of the magnetic pole are wound around the magnetic pole shaft 51 constituting a part of the magnetic pole having a rectangular cross section. There is a problem that the gaps 54 and 55 are formed in the gap and the winding density cannot be increased. Reference numeral 56 denotes a caulking portion, and 57 and 58 are connecting portions.
As a technique for coping with this problem, Patent Document 1 discloses that as shown in FIG. 8, the widths of the upper end 61 and the lower end 62 are gradually reduced as viewed from the cross section of the magnetic pole shaft portion 60 of the divided laminated core 59 constituting the laminated core. It is disclosed. According to this, the winding around the magnetic pole shaft portion 60 can be wound without causing a gap between the upper end portion 61 and the lower end portion 62. In FIG. 8, 63 is a magnetic pole tooth part.

JP 2005-348553 A

By the way, each divided core piece 64 constituting the divided laminated core 59 is formed by press working, and a burr 65 is generated at the end of the divided core piece 64. On the other hand, the winding to the magnetic pole shaft part 60 is performed at high speed by applying tension to the winding. Therefore, the insulating coating formed on the surface of the winding may be damaged at a location where it directly contacts the magnetic pole shaft portion 60. In particular, there is a problem that the insulating coating is damaged at a location from the upper end side to the intermediate portion side and a location from the lower end side to the intermediate portion side of the magnetic pole shaft portion 60 where the winding direction of the winding changes.

The present invention has been made in view of such circumstances, and a laminated iron core formed at a high density without causing the winding to the magnetic pole shaft portion to damage the insulating coating of the winding or damaging the winding itself. It is an object of the present invention to provide a method for obtaining the laminated iron core.

The laminated iron core according to the first aspect of the present invention is formed by caulking and laminating a plurality of divided iron core pieces obtained by dividing a yoke for each magnetic pole, and the width of the laminated upper end side and the laminated lower end side of the magnetic pole shaft portion is the upper end and the lower end, respectively. In the laminated core in which the divided laminated iron cores gradually decreased toward the magnetic pole shaft portion and the corners of the magnetic pole shaft portions are removed are connected in an annular manner via connecting portions provided at both ends of the divided laminated iron cores.
The split iron core piece with the width of the magnetic pole shaft portion on the upper end side of the stack gradually decreasing has a downward sag, and the split core piece with the width of the magnetic pole shaft portion on the lower end side of the stack gradually has an upward sag.
Here, the sag is a shoulder sag that occurs at the upper edge of the work plate when the work plate is punched by lowering the punch using the upper punch and the lower die. Means that this shoulder sag is down. In this case, a punching burr is generated at the lower end portion of the processed plate, and the direction of the punching burr is also the same direction as the punching sagging. When the vertical relationship between the punch and the die is reversed, the sag and burrs are upward.

Also, the manufacturing method of the laminated core according to the second invention that meets the above-mentioned object is characterized in that a plurality of divided core pieces obtained by dividing the yoke for each magnetic pole are caulked and laminated, and the width of the magnetic pole shaft portion on the upper end side of the stack and on the lower end side of the stack Is a laminated core in which the divided laminated cores, which are gradually reduced toward the upper end and the lower end, respectively, and the corners of the magnetic pole shaft portions are eliminated, are connected in a ring shape via connecting portions provided at both ends of the divided laminated core, and A split core piece with a gradually decreasing width of the magnetic pole shaft portion on the upper end side of the stack has a downward sag, and a split core piece with a gradually decreasing width of the magnetic pole shaft portion on the lower end side of the stack has a sag downward. A manufacturing method comprising:
Punching of the magnetic pole shaft piece of the divided core piece on the lower end side of the stack performed by passing the work plate through a press processing line is performed from below, and the magnetic pole shaft piece portion of the divided core piece on the upper end side of the stack Is formed from above.

In the method for manufacturing a laminated core according to the second aspect of the invention, the first slot punching for forming the magnetic pole shaft piece of the split core piece on the lower end of the stack and the magnetic pole piece of the split core piece on the upper end of the stack Are formed at different stations, and the first slotting is provided with a punch on the lower side of the work plate and a die paired with the punch on the upper side. In the slot removal, it is preferable that a punch is provided on the upper side of the work plate and a die which is paired with the punch is provided on the lower side.

In the laminated iron core according to claim 1, since the magnetic pole around which the winding is wound is drawn toward the middle portion in the laminated thickness direction (that is, the sharp angle is eliminated) on both the laminated upper end side and the laminated lower end side. Even if the wire is wound under high tension, the wire is wound without damaging the insulating coating. It is wound at a higher density.

Moreover, the manufacturing method of the laminated iron core according to claim 2 and 3 performs the punching formation of the magnetic pole shaft piece portion of the divided iron core piece on the lower end side of the lamination performed by passing the work plate through the press working line from the lower side, Since the magnetic pole shaft piece of the split core piece on the upper end side of the stack is punched from above, the magnetic poles on the upper end of the stack and the lower end of the stack are oriented toward the middle in the stack thickness direction, and high tension is applied during winding The winding is wound in direct contact with the upper end side and the lower end side of the magnetic poles, but the windings are not damaged by the insulating coating and have the effect of being wound with high productivity. .

According to a third aspect of the present invention, there is provided a method for manufacturing a laminated core, comprising: first slotting for forming a magnetic pole piece of a divided core piece on the lower end of the laminated; and forming a magnetic pole piece of a divided core piece on the upper end of the laminated piece. The second slotting is performed at different stations, the first slotting is provided on the lower side of the work plate, the raising and lowering punch is provided on the upper side, and the die paired with the punch is provided on the upper side. Since the die that moves up and down is provided on the upper side of the work plate and the die that is paired with the punch is provided on the lower side, the mold configuration is facilitated, and the divided cores are manufactured by continuously manufacturing the divided core pieces. It is easy to manufacture.

Subsequently, a laminated core and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
1A and 1B are respectively a plan view and a front sectional view of a divided laminated core constituting the laminated iron core according to the embodiment of the present invention, and FIGS. 2A and 2B are respectively shown. FIG. 1B is an enlarged view of part a and part b, FIG. 3 is an explanatory view showing a method for manufacturing a laminated core according to an embodiment of the present invention, FIGS. 4 and 5 are detailed explanatory views of the method, 6A to 6E are plan views of the divided core pieces.

First, a laminated iron core according to an embodiment of the present invention will be described. In the laminated iron core of the present embodiment, a plurality of divided laminated iron cores 10 as shown in FIGS. 1A and 1B are connected to each other via connecting portions 11 and 12 provided on both sides thereof (in this embodiment, 8). Piece) connected in a ring shape. Since each divided laminated iron core 10 has the same shape, one of them will be described in detail. In addition, the same number is used for each component of the split core piece having the same shape in plan view of the split laminated core 10, and the term “piece” is added to the name in principle.

When viewed in plan, the divided laminated core 10 in which the yoke is divided for each magnetic pole has a divided yoke part 13 whose outer side has an arc shape, and a magnetic pole part 14 connected radially inward at the center of the divided yoke part 13. Further, the magnetic pole part 14 has a magnetic pole shaft part 15 and a magnetic pole tooth part 16 having an arcuate inner surface. Then, when the divided laminated core 10 is viewed in the lamination thickness direction, an area 17 on the lower end side of the lamination, an intermediate area 18 laminated thereon, and an area 19 on the upper end side of the lamination laminated thereon. Each of the plurality of divided core pieces 20 to 22 is caulked and connected via a caulking portion 23 having a known shape. Note that only the caulking through hole 23a (see FIG. 3) is formed in the lowermost divided core piece 20, and there is no caulking projection on the lower side.

The divided yoke piece 13 of the divided core piece 22 from the uppermost part (or the lowermost part) to n sheets (in this embodiment, three pieces) is one side (right side) in FIG. A notch 25 is provided in which the protruding portion 24 of the divided core piece 22 disposed adjacent to the (left side) fits exactly. In the divided core pieces 22, 21 from the (n + 1) th sheet to the 2nth sheet (fourth to sixth sheets in this embodiment) from the top, the shape of the divided yoke piece 13 extends from the top to the nth sheet. 1, the positions of the projections 24 and the cutouts 25 are changed between the left and right sides, and the connecting parts 11 having irregularities as shown in FIG. 12 are formed on both sides of the split laminated iron core 10.

The widths of the magnetic pole shaft pieces 15 of the divided core pieces 20 and 22 in the regions 17 and 19 on the lower layer side and the upper layer side of the divided laminated iron core 10 gradually narrow toward the lower and upper ends, respectively. The four corners normally formed at the four corners are eliminated. In this embodiment, as shown in FIGS. 6D to 6A, four (m) divided core pieces 20 in the region 17 on the lower end side of the stack are directed toward the lower end, and the region on the upper end side of the stack. Each of the four divided core pieces 22 at 19 has the width of the magnetic pole piece 15 narrowing toward the upper end. FIG. 6E shows a split core piece 21 that is caulked and stacked on the split core piece 20 (22), and has the width of the regular magnetic pole piece 15.

Then, as shown in FIG. 2 (B), the burrs 35 (see FIG. 4) are caulked at the both end portions of the magnetic pole piece 15 of the divided core piece 20 in the region 17 on the lower end side of the stack. The magnetic pole shaft piece 15 is laminated and a sag 35a is formed on the lower side of the magnetic pole shaft piece 15. The corners are rounded. Further, as shown in FIG. 2A, the punching burrs 39 (see FIG. 5) formed on both side ends of the magnetic pole piece 15 of the divided core piece 22 in the upper end side region 19 are formed downward. The upper side of both end portions of the magnetic pole piece piece 15 is a sag 39a and is rounded.

The radially outer wall 26 of the magnetic pole tooth portion 16 has the same configuration as that of the magnetic pole shaft portion 15, and the thicknesses in the radial direction of the regions 17 and 19 on the lower layer side and the upper layer side are respectively lower and upper. The corners on the outside in the radial direction are rounded. In addition, the sag is also in the same direction as that of the magnetic pole shaft portion 15 so that the sharp corner portions of the divided core pieces 20 and 22 do not come into contact with the portion where the winding contacts. The inner wall 27 in the radial direction of the divided yoke portion 13 is a vertical surface orthogonal to the axis of the magnetic pole shaft portion 15. With such a structure, even if the winding is firmly applied to the magnetic pole shaft portion 15, the winding contacts the magnetic pole shaft portion 15 and the magnetic pole tooth portion 16 so that wrinkles do not occur.
In addition, an engagement portion 29 having a trapezoidal cross section for engaging and connecting the manufactured divided laminated core 10 to an assembly jig is provided on the radially outer side in the center of the divided yoke portion 13.

Next, with reference to FIGS. 3 to 5, a method for manufacturing the divided laminated core 10 constituting the laminated core according to the embodiment of the present invention will be described.
In summary, the split laminated iron core 10 is manufactured through steps 1 to 10 (corresponding to the stations 1 to 10) by a press device (not shown) as shown in FIG.
In step 1, pilot holes 31 are formed on both sides of a processed plate 30 made of, for example, a magnetic steel plate, which passes through a press processing line. This processed plate 30 is intermittently fed through steps 1 to 10, and alignment with a die including a punch and a die is performed using the pilot holes 31.

Step 2 is slot removal for forming the magnetic pole piece 15, and 32 in FIG. 3 indicates a pair of slots. In this step 2, as shown in FIG. 4A, a die 33 that is paired with the punch 33 is disposed below the work plate 30, and the die 34 is fixed and the punch 33 is fixed from below. The work plate 30 is punched out. As a result, as shown in FIG. 4B, the punching burr 35 at the time of punching is formed facing upward, and the punching end portion on the lower side of the processed plate 30 becomes a punching sag 35a and has a rounded corner.

In this step 2, the slotting of the four (m) divided core pieces 20 and the divided core piece 21 thereon as shown in FIGS. 6 (A) to 6 (D) is performed. Accordingly, the punch 33 and the die 34 which are paired in the plate width direction sequentially move from the minimum width position to the normal width position of the magnetic pole piece 15 to thereby form the four divided core pieces 20 and the divided core pieces 21 thereon. A radially outer contour of the magnetic pole piece 15 and the magnetic pole tooth portion 16 connected to the magnetic pole piece 15 and a radially inner contour of the divided yoke piece 13 are formed.

The divided core piece 21 positioned at the lowermost part of the magnetic pole piece 15 having a regular dimension shown in FIG. 6 (E) performs punching (upper punching) to move the punch 33 upward from below. With respect to the divided core pieces 21 and 22 positioned above the piece 21, slotting for forming the magnetic pole piece piece 15 is performed in step 3 (ie, station 3). Therefore, the divided core pieces 21 and 22 for which the punching process is performed in the process 3 are idle processes in the process 2, and the divided core pieces 20 and 21 formed by punching in the process 2 are the idle process.
In FIG. 3, reference numeral 40 denotes a slot 40 formed by removing the slot in step 3. In addition, it is possible to form all the divided core pieces 21 except the uppermost divided core piece 21 in the step 2, but in the case of the process 3, since the slotted punch 36 falls down, scrap processing is performed. Becomes easy.

In this step 3, when slotting is performed to form the magnetic pole piece 15 of the split core piece 22 shown in parentheses in FIGS. 6D to 6A, the magnetic pole piece 15 of the normal width is initially set. The punch 37 and the die 38 on both sides in the width direction are moved to the center side of the press processing line with the press processing line (not shown) sandwiched from the position to form the magnetic pole shaft piece portion 15 in order. Narrow and punched. As shown in FIG. 5 (A), the punch 37 in this case moves from the upper side to the lower side (that is, the lower punch), so that all the punch burrs 39 face downward as shown in FIG. 5 (B). The upper end of the cut end of the work plate 30 is a sag 39a with rounded corners.

Steps 4 and 5 are steps of forming a protruding portion 24 on one side and a notch 25 into which the protruding portion 24 is fitted on the other side in order to form a connecting portion of the divided core pieces 20 to 22. In this embodiment, the connecting portions 11 and 12 of the divided laminated core 10 are formed by changing the formation positions of the protrusions 24 and the notches 25 every three (n). Therefore, the process 4 and the process 5 become an idle process every 3 sheets with respect to all the division | segmentation iron core pieces 20-22. The protrusion 24 and the notch 25 are formed by forming notches 42 to 45 having outer shapes in the width direction of the protrusion 24 and the notch 25 at predetermined positions of the processed plate 30.

In step 6, the tooth end portions 46 and 47 for determining the end portion of the magnetic pole tooth piece portion 16 are punched out from all the divided core pieces 20 to 22. Step 7 punches out the hole 48 that forms the engagement portion 29 with the assembly jig in the back portion of the divided laminated core 10 for all the divided core pieces 20 to 22.
In step 8, the through-holes 23a are formed in the split core pieces 20 at the bottom of the stack. In step 9, the caulking portion 23 is formed on the other divided core pieces 20 and the divided core pieces 21, 22 except for the lowermost divided core piece 20. In this embodiment, the caulking portion 23 uses half-cut caulking, but may be a known V-shaped caulking. In step 10, the divided core pieces 20 to 22 are removed from the outer shape, and the divided core pieces 20 to 22 are sequentially stacked in the mold while being caulked to produce the divided laminated core 10 shown in FIG. 1.

Next, a winding is applied to the magnetic pole shaft portion 15 of the predetermined number of divided laminated iron cores 10, and a plurality of divided laminated iron cores 10 are connected in an annular shape via the connecting portions 11, 12, so that the stator provided with the winding A laminated iron core (stator) is manufactured.

The present invention is not limited to the above-described embodiment. For example, the present invention can be applied to laminated iron cores having different numbers of magnetic poles.
In the above embodiment, the inner wall in the radial direction of the divided yoke portion 13 of each divided laminated core 10 has a flat shape, but the present invention also applies to an arcuate surface having the same center as the outer shape of the divided yoke portion. Applies.
In the above embodiment, the “hole” includes a case of penetrating.

(A), (B) is the top view and front sectional view of the division | segmentation laminated | stacked iron core which respectively comprise the laminated iron core which concerns on one embodiment of this invention. (A), (B) is an enlarged view of a part and b part of Drawing 1 (B), respectively. It is explanatory drawing which shows the manufacturing method of the laminated iron core which concerns on one embodiment of this invention. (A) and (B) are detailed explanatory views of the method. (A) and (B) are detailed explanatory views of the method. (A)-(E) are top views of a division | segmentation iron core piece. (A) is a top view of the division | segmentation laminated | stacked iron core which concerns on a prior art example, (B) is a front sectional view of the magnetic pole axial part of the division | segmentation laminated | stacked iron core. It is explanatory drawing of the magnetic pole part of the laminated iron core which concerns on a prior art example.

Explanation of symbols

10: split laminated iron core, 11, 12: connecting portion, 13: split yoke portion (split yoke piece portion), 14: magnetic pole portion, 15: magnetic pole shaft portion (magnetic pole shaft piece portion), 16: magnetic pole tooth portion (magnetic pole tooth) (Single part), 17: area on the lower end side of the stack, 18: area on the upper end of the stack, 19: area on the upper end side of the stack, 20-22: split core pieces, 23: caulking part, 23a: caulking through hole, 24: protruding part, 25: Notch, 26: Radial outer wall, 27: Radial inner wall, 29: Engagement part, 30: Work plate, 31: Pilot hole, 32: Slot, 33: Punch, 34: Die, 35 : Burr, 35a: Drain, 36: Punch, 37: Punch, 38: Die, 39: Burr, 39a: Butter, 40: Slot, 42-45: Notch hole, 46, 47: End of tooth Part, 48: hole

Claims (3)

A plurality of divided core pieces each having a yoke divided for each magnetic pole are caulked and laminated, and the widths of the upper end side and the lower end side of the magnetic pole shaft portion are gradually reduced toward the upper end and the lower end, respectively, so that the angle of the magnetic pole shaft portion is eliminated. In the laminated core in which the divided laminated iron cores are connected in a ring shape via connecting portions provided at both ends of the divided laminated iron cores,
The split core piece with the width of the magnetic pole shaft portion on the upper end of the stack gradually decreasing has a pulling downward direction, and the split core piece with the width of the magnetic pole shaft portion on the lower end side of the stack gradually decreasing has a pulling upward direction. Characteristic laminated iron core. A plurality of divided core pieces each having a yoke divided for each magnetic pole are caulked and laminated, and the widths of the upper end side and the lower end side of the magnetic pole shaft portion are gradually reduced toward the upper end and the lower end, respectively, so that the angle of the magnetic pole shaft portion is eliminated. The laminated cores obtained by connecting the divided laminated cores in a ring shape through the connecting portions provided at both ends of the divided laminated cores, and further, the divided core pieces whose width of the magnetic pole shaft portion on the upper end side of the laminated layers is gradually reduced are removed. The split core piece in which the width of the magnetic pole shaft portion on the lower end side of the laminated layer is gradually reduced in the downward direction is a manufacturing method of the laminated core in which the punching is upward.
Punching of the magnetic pole shaft piece of the divided core piece on the lower end side of the stack performed by passing the work plate through a press processing line is performed from below, and the magnetic pole shaft piece portion of the divided core piece on the upper end side of the stack A method for manufacturing a laminated iron core, wherein the punching of is performed from above. 3. The method of manufacturing a laminated core according to claim 2, wherein a first slotting for forming a magnetic pole shaft piece portion of the divided core piece on the lower end side of the laminated layer and a magnetic pole shaft piece portion of the divided core piece on the upper end side of the laminated layer are provided. The second slotting to be formed is performed at a separate station, the first slotting is provided with a punch that moves up and down below the workpiece plate, and a die that is paired with the punch on the upper side. 2. The method of manufacturing a laminated core according to claim 2, wherein the punching of the slot 2 includes a punch that moves up and down above the workpiece plate and a die that is paired with the punch on the lower side.

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