JP4578460B2 - Manufacturing method of stator laminated iron core - Google Patents

Description

The present invention relates to a method for manufacturing a stator laminated core in which windings are familiar with the magnetic poles of a divided laminated core and can be wound with high density, and the connecting and assembling of the divided laminated cores is labor-free and highly accurate.

Nowadays, the winding of the stator laminated core to the magnetic pole is facilitated by using a divided laminated core, and can be wound with high density. However, even though the winding is workable, in the case of winding around the magnetic pole, as shown in FIGS. 5A and 5B, in the split laminated core 70, the magnetic pole upper end portion 72 of the magnetic pole shaft portion 71 and the magnetic pole Clearances 74 and 75 are formed at the lower end 73, and the winding density of the coil 76 cannot be increased. In particular, when a thick winding is wound around the magnetic pole so as to reduce the copper loss of the motor, there is a problem that the gap is wider.
As a technique for coping with this problem, in Patent Document 1, as shown in FIGS. 6 (A) and 6 (B), the width of the upper end 79 and the lower end 80 is gradually reduced when the magnetic pole shaft 78 of the laminated iron core is viewed from the cross section. The thing is disclosed. According to this, the winding to the magnetic pole shaft part 78 can be wound without causing a gap between the upper end part 79 and the lower end part 80.

JP 2005-348553 A

However, Patent Document 1 does not clearly disclose a method for industrially manufacturing a laminated iron core, and the magnetic pole tooth portion 81 formed at the tip of the magnetic pole shaft portion has a trapezoidal shape in plan view. Considering that the inside of the yoke portion has an arcuate shape, it is extremely difficult to manufacture, and there is a problem to develop a method for manufacturing such a laminated core. Further, this type of laminated iron core is formed by connecting divided laminated iron cores, but there is a problem that the connecting and assembling does not require labor and the assembling accuracy is high.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a stator laminated core capable of manufacturing a stator laminated core capable of high-density winding of magnetic poles at an industrially low cost. .

According to the first aspect of the invention, the stator laminated core manufacturing method according to the first aspect of the invention includes punching and laminating divided core pieces obtained by dividing the annular yoke piece for each pole piece by passing the work plate through the press processing reference line. Then, after forming the divided laminated core in which the upper part of the magnetic pole shaft portion is directed upward and the lower part of the laminated layer is gradually reduced downward, the divided laminated iron cores are formed at both ends. In the manufacturing method of the stator laminated iron core to be connected through the part,
There are provided first and second molds for punching a slot portion for punching one and the other side surfaces of a magnetic pole shaft piece portion connected to the yoke piece portion and the magnetic pole tooth piece portion of the divided core piece from the work plate. And
With respect to the divided core pieces from the first laminated sheet to the desired number n1 of the magnetic pole shaft piece portions having a predetermined width W, the first and second press working reference lines that are the center lines of the magnetic pole shaft piece portions Punching out the second mold so that the width of the magnetic pole piece is gradually increased to the predetermined width W;
Punching out the magnetic pole shaft piece from the desired number n1 to the desired number n2 with the predetermined width W while fixing the positions of the first and second molds;
Wherein from a desired number n2 until laminated final number n3 segment core pieces, the first, second mold the pressing reference the predetermined width said pole shaft piece is advanced to the line W Punched out gradually from
At both ends of the yoke piece portion of the divided iron core piece, connecting piece portions for connecting the divided laminated iron cores finally caulked and laminated are formed, respectively, and the divided laminated iron core is further provided on the back surface of the yoke piece portion. After forming the engaging portion to be fixed to the jig, each of the divided core pieces is cut out and caulked and laminated,
In addition, the punching processing by the first and second molds on the one and other side surfaces of the magnetic pole piece is sequentially performed .

A method for manufacturing a stator laminated core according to a second invention is the method for manufacturing a stator laminated core according to the first invention, wherein the circumferential end surfaces of the magnetic pole tooth pieces are arranged at a predetermined distance from each other. The magnetic pole tooth piece is formed by gradually moving the second punching die to be formed in one direction or the other direction with respect to the pressing reference line (that is, as a reference) for each of the divided core pieces. The part is formed so as to be shifted (circumferentially) around the magnetic pole piece, and a skew is formed in the magnetic pole teeth of the divided laminated core formed by caulking and laminating the divided pieces.

The method for manufacturing a stator laminated core according to claim 1 or 2 is such that the laminated upper part of the magnetic pole shaft portion gradually decreases in the upward direction and the width of the laminated lower part decreases in the downward direction. The coil can be wound more densely around the magnetic pole shaft.
And in the manufacture of the split core pieces having different widths of the magnetic pole piece, the slot part punching die can be moved forward or backward with respect to the press working reference line, so that industrially more efficient manufacture can be achieved. It becomes possible.
Furthermore, since an engaging portion is formed on the back surface of each divided laminated iron core, this portion can be easily and accurately assembled by being locked to a jig.

Since the processing of one and the other side surfaces of the magnetic pole piece is performed sequentially, the design of the mold becomes easy and the power applied to the mold can be reduced.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of a process of a method for manufacturing a stator laminated core according to an embodiment of the present invention, and FIGS. 2A to 2C are stators according to another embodiment of the present invention. Explanatory drawing of the division | segmentation core piece formed by the manufacturing method of a lamination | stacking core, FIG. 3 (A), (B) is a top view of the division | segmentation lamination | stacking core which comprises the stator lamination | stacking iron core which concerns on the 1st Embodiment of this invention. 4A and 4B are explanatory views of a split laminated core used for the stator laminated core according to the second embodiment of the present invention, and FIG. 4C is a third embodiment of the present invention. It is explanatory drawing of the division | segmentation laminated | stacked iron core used for the stator laminated iron core which concerns on this form.

First, with reference to FIGS. 3A and 3B, the individual divided laminated cores 10 constituting the stator laminated core according to the first embodiment of the present invention will be described.
A stator laminated iron core (not shown) has a plurality of, for example, 8 to 16 magnetic poles 11 inside an annular yoke iron core. In the stator laminated core, the yoke core is divided for each magnetic pole 11 to form one divided laminated core 10. Each magnetic pole 11 has a magnetic pole shaft portion 13 whose base is connected to a yoke portion 12 (that is, a divided yoke iron core), and a magnetic pole tooth portion 14 provided at the tip of the magnetic pole shaft portion 13.

This divided laminated iron core 10 has a well-known shape formed on the yoke piece portion 22 of each divided iron piece 20, 21 in which an annular yoke piece is divided for each magnetic pole piece, and on the magnetic pole shaft piece portion 23 to which the base is connected. It is caulked and laminated via the caulking portion 24.
The width of the magnetic pole shaft portion (lower layer) 13 of the divided laminated core 10 from below the laminated divided core pieces 20 and 21 (first laminated layer) to n1th (for example, about 3 to 10) is directed downward. Thus, the length is gradually shortened from the left-right direction with reference to the center line of the magnetic pole shaft portion 13. Further, the magnetic pole shaft part (laminated upper part) 13 from the top of the divided core pieces 20 and 21 to the (n3-n2) th sheet is gradually shortened symmetrically toward the upper side. Note that n3 is the final number of laminated core pieces. The width of the remaining n2-n1 magnetic pole shaft portions 13 of the divided laminated iron core 10 is maintained at W. With this configuration, the corners 15 to 18 at the four corners of the cross section of the magnetic pole shaft 13 are formed in an arc shape or an elliptical arc shape.

The caulked portion of the lowermost divided core piece 20 is a through hole. Each of the divided core pieces 20 and 21 has an engagement portion 25 formed on the back side, that is, on the outer side in the radial direction and formed of a groove-shaped notch. The engaging portion 25 is used when the divided laminated core 10 is fixed to a jig (not shown).

The divided core piece 20 has a protruding portion (an example of a connecting piece portion) 26 on one side of the yoke piece portion 22 and a notched portion (an example of a connecting piece portion) 27 on the other side, and the divided core piece 21 is a yoke piece. In this embodiment, each of the divided laminated cores 10 has a cutout portion 27a on one side and a protruding portion 26a on the other side. On both sides of the yoke portion 12, connecting portions 28 and 29 each having a concave portion and a convex portion are formed. And the connection parts 28 and 29 of the adjacent division | segmentation laminated | stacked iron core 10 are meshed | engaged so that it may become a stator lamination | stacking iron core. In this embodiment, three divided core pieces are continuously laminated, but the present invention is also applied to a case where two or four or more pieces are continuously laminated.

Further, in the split laminated core 10, the radially inner sides 31 and 32 of the yoke portion 12 to which the base portion of the magnetic pole shaft portion 13 is connected and the magnetic pole to which the tip portion of the magnetic pole shaft portion 13 (that is, the radially inner side) is connected. The radially outer sides 33 and 34 of the tooth portion 14 have the same width and are parallel to each other. Therefore, also in the divided core pieces 20 and 21 constituting the divided laminated core 10, the radially inner sides 31 and 32 of the yoke piece 22 (the same name and number are used because they are at the same position as the divided laminated core 10). The radially outer sides 33 and 34 of the magnetic pole piece 35 are parallel and have the same width.

Then, the manufacturing method of the stator laminated core which concerns on one embodiment of this invention is demonstrated, referring FIG.
First, a strip material (for example, a silicon steel plate having a thickness of 0.2 to 1 mm) 36, which is an example of a processed plate having a length from which the divided core pieces 20 and 21 are collected, is prepared. It introduces into the press work facility which performs the press work process of the process 10 sequentially. The strip 36 is intermittently conveyed from step 1 to step 10 sequentially by a conveying means (not shown) with reference to the pilot holes 37 and 38.

In step 1, pilot holes 37 and 38 are formed on both sides of the strip 36 in the width direction. In step 2, a first hole 40 is formed which forms one radial outer side 34, one radial inner side 32 of each of the divided core pieces 20 and 21, and one outline 39 of the magnetic pole shaft piece 23 connected thereto. Form. A first die (an example of a slot punching die) composed of a punch and a die for forming the first punching hole 40 (the same applies to the following die) includes a radially outer side 34 and a radially inner side. It moves along the side 32 so that the width of the magnetic pole piece 23 can be adjusted. In step 3, the second radial hole 43 that forms the other radial outer side 33, the radial inner side 31 of the divided core pieces 20, 21, and the other contour line 42 of the magnetic pole piece piece 23 connected thereto. Form. A second die (an example of a slot punching die) that forms the second punching hole 43 moves along the radially outer side 33 and the radially inner side 31, and the width of the magnetic pole piece 23. Can be adjusted.

Therefore, when forming the n1st divided core pieces 20 and 21 from the lowest layer constituting the divided laminated core 10, the first and second dies are used as the press working reference line (that is, the center of the strip 36). The first and second punching holes 40 and 43 are punched while being gradually retreated with respect to the wire and also the center line of the magnetic pole piece 23. Further, when forming the n1-th to n2-th divided core pieces 20, 21 constituting the divided laminated core 10, the first and second magnetic pole shaft pieces 23 maintain a predetermined width, for example, the maximum width W. The first and second punch holes 40 and 43 are punched by fixing the position of the mold. And in manufacture of the split core pieces 20 and 21 from the n2nd to the final stack number n3 constituting the split laminated core 10, the first and second molds are gradually advanced with respect to the press working reference line. Thus, the width W of the magnetic pole piece piece 23 is gradually reduced.

In Steps 4 and 5, the third to sixth holes 44 to 47 that form the outlines of the protruding portions 26 and 26 a and the notches 27 and 27 a that become the connecting portions 28 and 29 with respect to the divided core pieces 20 and 21. Punching is performed with the third to sixth molds. When the split core piece 20 passes through the process 4, the movement of the third and fourth molds is stopped, and when the split core piece 21 passes through the process 5, the movement of the fifth and sixth molds. Stop. In step 6, the contours of both side ends of the magnetic pole tooth pieces 35 of the divided core pieces 20, 21 are formed by punching the seventh and eighth punch holes 48, 49 with the seventh and eighth molds. And do it.

In this embodiment, since the positions of the seventh and eighth molds are fixed, the magnetic pole tooth portion 14 formed on the split laminated core 10 is perpendicular to the vertical direction (straight). 7 and 8, which form eight punching holes 48 and 49 (that is, punches and dies, each of which is an example of a second slot punching die), are shown in FIG. Forming a magnetic pole tooth piece portion 35a finally formed by moving the divided core pieces 20 and 21 through the predetermined minute distance k at the same time while maintaining a predetermined interval in the circumferential direction (that is, in the circumferential direction). The position can be gradually changed between the maximum displacement in one direction from the circumferential direction with respect to the magnetic pole piece 23 (that is, the press working reference line). When the divided core pieces 20 and 21 are caulked and laminated, as shown in FIGS. 4A and 4B, the divided laminated core 10a in which the magnetic pole tooth portion 14p is skewed (second embodiment of the present invention). ) Can be formed. Here, if the thickness of the divided laminated core 10a is T and the circumferential phase distance between the upper end and the lower end of the magnetic pole teeth 14p of the divided laminated core 10a is H, the skew angle α is arctan H / T. When the adjacent magnetic pole tooth portions 14p are viewed in plan, the phase distance H is 0.8 to 5 times the gap G between the magnetic pole tooth portions 35a of the adjacent divided core pieces 20 and 21 at the same height (preferably , 1.2 to 2.5 times) is preferable. When the number of the divided core pieces 20 and 21 stacked is m, the minute distance k is H / m.

In the divided laminated core 10a shown in FIGS. 4A and 4B, the other components are the same as those of the divided laminated core 10, and therefore, the same reference numerals are given and detailed description thereof is omitted. Further, the punch and die for cutting out the end portions of the magnetic pole tooth pieces (forming the seventh and eighth punch holes 48 and 49) are simultaneously applied in the circumferential direction of the divided core piece to be the final punched piece. By moving back and forth, as shown in FIG. 4C, it is possible to form the split laminated iron core 10b (third embodiment of the present invention) in which a skew is formed in the magnetic pole tooth portion 14q. In either case, since the magnetic pole shaft portion 13 is straight (vertical) in the vertical direction, the winding can be wound without any trouble.

In step 7, a ninth punch hole 50 for forming an engaging portion 25 (groove) formed on the back portion (radially outer center) of each of the divided core pieces 20, 21 is punched and formed by a ninth die. In step 8, the three caulking holes 51 to be caulked portions of the lowermost divided core pieces 20 are formed by the tenth to twelfth molds.

In step 9, the three caulking protrusions 52 that form the caulking portions of the divided core pieces 20 and 21 excluding the lowermost layer are formed by the thirteenth to fifteenth molds. In step 10, punching of the radially inner contour line 53 and the radially outer contour line 54 of the split core pieces 20, 21 is performed by punching with a sixteenth mold. In steps 6 to 8, the case where the split core pieces 20 are formed is described. However, the split core pieces 21 are also processed in the same process. Moreover, although the process 9 demonstrated the case where the split core piece 21 was formed, the split core piece 20 is processed by the same process. The 16th metal mold | die used for the process 10 becomes a shape which includes both the division | segmentation iron core pieces 20 and 21. FIG.

The split core pieces 20 and 21 that have been removed from the lower part of the mold in Step 10 are sequentially caulked and stacked to form the split stack core 10 shown in FIG. In the lamination of the divided core pieces 20 and 21, as shown in FIG. 3B, it is preferable that a plurality of divided core pieces 20 and 21 are alternately stacked (for example, 2 to 6 pieces). Thereby, even when the split core pieces 20 and 21 are extremely thin, the meshing portions of the connecting portions 28 and 29 have a constant thickness, and the assembly efficiency of the split laminated core 10 is improved. As a matter of course, a predetermined coil is wound around each magnetic pole shaft portion 13 of the divided laminated core 10 and then assembled.

Next, a method for manufacturing a stator laminated core according to another embodiment of the present invention will be described with reference to FIG. 2. In the method for manufacturing a stator laminated core shown in FIG. In step 2, the second mold is used in step 3, and the first and second punch holes 40 and 43 are respectively formed. In this embodiment, the first mold and the second mold are formed. The first and second punch holes 40 and 43 are punched using the two molds simultaneously in the same process. In this case, the first and second molds are structured to advance and retract in synchronization with the press working reference line.

Accordingly, the divided core piece 20 (21 is also the same) having a narrow pole shaft piece portion 23 shown in FIG. 2A, the divided core piece 20 having a wide width, shown in FIG. The intermediate divided core piece 20 shown in 2 (B) can be formed in one process, and the process can be shortened.

In the embodiment described above, the number of magnetic poles of the stator laminated core has been specified and described. However, the number of magnetic poles and the shape of the stator laminated core can be arbitrarily selected within a range not changing the gist of the present invention.
Further, in the method of manufacturing the stator laminated iron core, in forming the magnetic pole shaft pieces with different widths, the mold is moved in one step to change the width of the magnetic pole shaft pieces to be formed. The mold may be moved separately.
Further, by changing the distance to move the mold in accordance with the position of the divided core pieces to be stacked, it is possible to change the arc shape or elliptic arc shape of the upper and lower cross-sectional shapes of the magnetic pole shaft portion.

It is explanatory drawing of the process of the manufacturing method of the stator laminated core which concerns on one embodiment of this invention. (A)-(C) are explanatory drawings of the division | segmentation core piece formed with the manufacturing method of the stator laminated core which concerns on other embodiment of this invention. (A), (B) is the top view and sectional drawing of the division | segmentation laminated | stacked iron core which comprise the stator laminated iron core which concerns on the 1st Embodiment of this invention. (A), (B) is explanatory drawing of the division | segmentation laminated | stacked iron core used for the stator lamination | stacking iron core which concerns on the 2nd Embodiment of this invention, (C) is the stator which concerns on the 3rd Embodiment of this invention. It is explanatory drawing of the division | segmentation laminated | stacked iron core used for a laminated iron core. (A) is a top view of the division | segmentation laminated | stacked iron core which concerns on a prior art example, (B) is arrow aa 'sectional drawing in the same figure (A). (A) is sectional drawing of the division | segmentation laminated | stacked iron core which concerns on a prior art example, (B) is the same top view.

10, 10a, 10b: Divided laminated iron core, 11: magnetic pole, 12: yoke portion, 13: magnetic pole shaft portion, 14, 14p, 14q: magnetic pole tooth portion, 15-19: corner portion, 20, 21: divided iron core piece, 22: Yoke piece part, 23: Magnetic pole piece part, 24: Caulking part, 25: Engagement part, 26, 26a: Projection part, 27, 27a: Notch part, 28, 29: Connection part, 31, 32: Radial inner side, 33, 34: Radial outer side, 35, 35a: Magnetic pole tooth piece, 36: Strip material, 37, 38: Pilot hole, 39: Outline line, 40: First punch hole, 42: Outline line, 43: second hole, 44: third hole, 45: fourth hole, 46: fifth hole, 47: sixth hole, 48: seventh hole 49: eighth punch hole, 50: ninth punch hole, 51: caulking hole, 52: caulking projection, 53, 54: contour line

Claims (2)

The plate to be processed is passed through the press processing reference line, and divided core pieces obtained by dividing the annular yoke piece for each pole piece are punched and laminated, and the upper part of the magnetic pole shaft is directed upward and the lower part of the laminated part is In the manufacturing method of the stator laminated core, in which the divided laminated cores whose width is gradually reduced toward the lower direction are formed, and then the divided laminated cores are connected to each other through the connecting portions formed at both ends.
There are provided first and second molds for punching a slot portion for punching one and the other side surfaces of a magnetic pole shaft piece portion connected to the yoke piece portion and the magnetic pole tooth piece portion of the divided core piece from the work plate. And
With respect to the divided core pieces from the first laminated sheet to the desired number n1 of the magnetic pole shaft piece portions having a predetermined width W, the first and second press working reference lines that are the center lines of the magnetic pole shaft piece portions Punching out the second mold so that the width of the magnetic pole piece is gradually increased to the predetermined width W;
Punching out the magnetic pole shaft piece from the desired number n1 to the desired number n2 with the predetermined width W while fixing the positions of the first and second molds;
Wherein from a desired number n2 until laminated final number n3 segment core pieces, the first, second mold the pressing reference the predetermined width said pole shaft piece is advanced to the line W Punched out gradually from
At both ends of the yoke piece portion of the divided iron core piece, a connecting piece portion for connecting the divided laminated iron cores finally caulked and laminated is formed, and the divided laminated iron core is further provided on the back surface of the yoke piece portion. After forming the engaging portion to be fixed to the jig, each of the divided core pieces is cut out and caulked and laminated ,
In addition, a method for manufacturing a stator laminated core, wherein each of the first and second molds on the one and other side surfaces of the magnetic pole piece is sequentially punched . 2. The method of manufacturing a stator laminated core according to claim 1 , wherein a second slot punching die that is arranged at a predetermined distance and forms a circumferential end face of each of the magnetic pole tooth pieces is used as each of the divided cores. For each piece, it is gradually moved in one direction or the other direction with respect to the press-working reference line, and the magnetic pole tooth pieces are formed so as to be shifted from the magnetic pole piece, and the divided core pieces are caulked. A method of manufacturing a stator laminated core, wherein skew is formed in the magnetic pole teeth of the divided laminated core formed by lamination.

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