JP2008118838A - Laminated core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core wherein winding of a coil around a magnetic pole center portion is performed without damaging an insulating film of the coil and the coil itself, a better space factor is obtained, and winding work is performed with better productivity. <P>SOLUTION: In the laminated core in which split laminated cores 10 are connected through connecting portions 19, 20, corner portions 15, 16 of upper and lower ends of the magnetic pole center portion 12, and corner portions 17, 18 at a radial outside, and of upper and lower ends of a thickness direction of a magnetic pole tooth portion 13 are rounded, wherein the split laminated cores are formed by laminating by caulking split iron core members 21, 22 in which yoke strips are split for every magnetic pole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a laminated iron core that can be wound around a magnetic pole of a divided laminated iron core so that it can be wound with high density and can be easily wound without damaging the winding wound around the magnetic pole.

The winding of the laminated core on the magnetic pole is facilitated by using a divided laminated core, and can be wound with high density. However, as shown in FIGS. 5 (A) and 5 (B), although the winding 60 is workable, gaps 64 and 65 are formed between the magnetic pole upper end 62 and the magnetic pole lower end 63 when it is wound around the magnetic pole 61. It is possible to increase the winding density. In particular, when the thick winding is wound around the magnetic pole so as to reduce the copper loss of the motor, the gaps 64 and 65 are formed wider. Here, 66 indicates a split laminated iron core, 67 indicates a caulking portion, and 68 and 69 indicate connecting portions.

As a technique for coping with this, Patent Document 1 discloses a technique in which a magnetic pole 70 of a laminated iron core is gradually reduced from an upper end portion 72 and a lower end portion 73 of a magnetic pole shaft portion 71 as viewed from a cross section as shown in FIG. . According to this, the winding around the magnetic pole shaft portion 71 can be wound without causing a gap between the upper end portion 72 and the lower end portion 73.

JP 2005-348553 A

However, in the technique of Patent Document 1, the upper and lower ends of the magnetic pole shaft portion 71 have no corners and the winding can be smoothly performed without generating a gap, but the upper and lower ends of the magnetic pole tooth portion 74 at the tip of the magnetic pole shaft portion 71. Since they are cut at a right angle and have the same inclination, there is a problem that the insulating film is broken by closely competing with the winding wound around the magnetic pole 70 (more precisely, the magnetic pole shaft portion 71).
Further, when winding the winding around the magnetic pole 70, the magnetic pole tooth portion 74 is larger than the magnetic pole shaft portion 71 and is located on the winding machine side. It may damage itself. Since such a phenomenon is likely to occur when winding at high speed, there remains a problem that the winding work cannot be made more productive.
In Patent Document 1, the magnetic pole teeth are directed to both sides in the circumferential direction so that the radial thickness is extremely thin. However, this increases the attenuation of magnetic flux on both sides of the magnetic pole teeth and increases the magnetic efficiency. There is also the problem of getting worse.

In the present invention, winding of the winding around the magnetic pole shaft portion can be performed with good space factor without damaging the insulating coating of the winding and the winding itself, and the winding work can be performed with higher productivity. It aims at obtaining the laminated iron core made.

The laminated core according to the first aspect of the present invention is formed by caulking and laminating divided core pieces obtained by dividing a yoke piece for each magnetic pole, and the widths of the upper end side and lower end side of the magnetic pole shaft portion are gradually reduced. A plurality of divided laminated iron cores having magnetic pole tooth portions that are formed on both sides in the circumferential direction in a radial direction and have arcuate inner ends in the radial direction are arranged on both sides of the divided yoke portions of the divided laminated iron cores. In the laminated iron core connected through the connecting part formed in
The width (thickness) in the radial direction becomes narrower (thin) toward both sides in the circumferential direction of the magnetic pole tooth part, and the radial widths on the upper end side and the lower end side of the magnetic pole tooth part gradually decrease, The distance between the radially outer side of the magnetic pole tooth part and the radially inner side of the divided yoke part gradually widens at the upper and lower end parts.

Moreover, the laminated core which concerns on 2nd invention is a laminated iron core which concerns on 1st invention, The edge of the radial direction outer side of the magnetic pole tooth piece part of the said division | segmentation iron core piece is linear.
And the laminated iron core which concerns on 3rd invention is a laminated iron core which concerns on 1st and 2nd invention, and the skew is formed in the lamination direction in the said magnetic pole tooth part. Note that it is preferable for the efficiency of the winding that the magnetic pole shaft portion is straight and does not form a skew.

In the present invention, not only the magnetic pole shaft portion but also the width of the magnetic pole tooth portion at the upper end side and the lower end side of the stack are gradually reduced and the corner (corner portion) is rounded. The windings that can be guided to the four corners on the upper and lower sides in the radial direction under a wide interval and that are introduced even if the winding speed is increased are wound without hitting the corners of the magnetic pole teeth. Thus, a laminated core can be obtained in which the winding can be performed with good productivity without causing damage to the insulating coating.
Further, since the magnetic pole shaft portion of the magnetic pole is as described above, it is needless to say that there is an effect that the winding is wound with a high space factor without causing a gap between the upper end side and the lower end side of the magnetic pole shaft portion.
In particular, by forming a skew in the magnetic pole teeth, the rotational torque is stabilized, and torque unevenness and knocking during low-speed rotation are eliminated.

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 is a plan view of a split laminated core of the laminated core according to one embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line XX, and FIG. 2 is a manufacturing method of the laminated core. 3A to 3C are plan views of divided core pieces, and FIGS. 4A and 4B are divided portions used for a laminated core according to another embodiment of the present invention. Explanatory drawing of a laminated iron core, (C) is explanatory drawing of the division | segmentation laminated | stacked iron core used for the laminated iron core which concerns on further another embodiment of this invention. In plan view, in order to distinguish each part of the split core piece of the same shape that is a component of the split laminated core, the split core pieces are distinguished by attaching “pieces”, and in some cases, the same Give a number.

First, a laminated core (specifically, a stator laminated core) according to an embodiment of the present invention will be described. This laminated core is constituted by combining a plurality of divided laminated cores 10 shown in FIG. 1 in which a yoke is divided for each magnetic pole. Each of the divided laminated cores 10 includes a divided yoke portion 11 having an arc shape on the outer side and a magnetic pole portion 14 integrally connected to the center in the radial direction of the divided yoke portion 11. The magnetic pole portion 14 includes a magnetic pole shaft portion 12 and a magnetic pole tooth portion 13 that is connected to the magnetic pole shaft portion 12 and has a radially inner end that is arcuate in plan view. Further, the magnetic pole tooth portion 13 is formed so as to spread on both sides of the magnetic pole shaft portion 12 (spread on both sides in the circumferential direction). The width of the magnetic pole shaft 12 gradually decreases at the upper end of the stack and the lower end of the stack, and the corners 15 and 16 of the upper and lower ends and the corners 17 and 18 of the upper and lower ends in the thickness direction outside the magnetic pole teeth 13 have corners. Removed and rounded.

As shown in FIGS. 1 (A) and 1 (B), on both sides in the circumferential direction of the divided yoke portion 11, connecting portions 19 and 20 connected to adjacent divided yoke portions (not shown) are provided. As shown in FIG. 1B, the connecting portions 19 and 20 are composed of a plurality of pieces of two divided core pieces 21 and 22 having different shapes on both sides constituting the divided laminated iron core 10 (four in this embodiment). ) Alternately stacked. In the divided core piece 21, a protruding portion 23 is formed on one side in the circumferential direction (right side in FIG. 1), and a notch 24 is formed on the other side so as to match the protruding portion 23. A notch 25 is formed on the side, and a protrusion 26 that fits into the notch 25 is formed on the other side. Each of the laminated core pieces 21 and 22 laminated is laminated and connected by a caulking portion 27 (half-cut caulking or V caulking) having a caulking projection and a caulking concave portion having a known structure.

The radially outer side of the divided yoke portion 11 has an arc shape in plan view, and a locking portion 28 for fixing the divided yoke portion 11 to the assembly jig is formed at the center thereof. The locking portion 28 is formed by a trapezoidal groove having a narrower inlet side than the inner side. Further, the radially inner side of the divided yoke portion 11, that is, the portion where the magnetic pole portion 14 is continuous is a straight line in plan view, and the magnetic pole shaft portion 12 is continuously provided at a right angle. The sides of the magnetic pole teeth 13 that are radially outward and the sides on both sides of the magnetic pole shaft 12 intersect at an obtuse angle, and the magnetic pole teeth 13 are the magnetic pole shaft around which a coil (winding) is wound. Since the width of the magnetic pole shaft portion 12 is narrowed on the bottom end side of 12, the magnetic pole tooth portion 13 is long in the circumferential direction, and the end portion side is narrowed to have a curved surface. And since the both ends of the magnetic pole tooth part 13 are bent in the winding machine direction, it is easy to wind.

Then, the manufacturing method of the division | segmentation laminated | stacked iron core 10 is demonstrated, referring FIG. In the production of the divided laminated core 10, since the processes of Step 1 to Step 10 are performed, 10 stations for performing the processes of Step 1 to Step 10 may be provided in one mold apparatus. Processes 1 to 10 may be performed by dividing them into a plurality of mold apparatuses. However, since the mold apparatus uses a well-known structure having a punch at the top and a die at the bottom, the detailed description thereof is as follows. Omitted.

For example, a strip 30 made of a magnetic steel plate having a thickness of 0.2 to 0.5 mm is prepared. The width is a dimension that allows the divided core pieces 21 and 22 to be arranged in the width direction.
In step 1 (station 1, the same applies hereinafter), pilot holes 31 and 32 are formed at both ends of the strip 30. As a result, the strip 30 can be accurately positioned. In step 2, a slot 33 on one side of the divided core pieces 21 and 22 is formed, and in step 3, a slot 34 on the other side of the divided core pieces 21 and 22 is formed. Each pair of punch and die (not shown) used in Steps 2 and 3 has a structure in which the punch and die can be moved in the width direction of the strip 30.

That is, in the divided laminated core 10, if the number of laminated core pieces 21 and 22 is n (usually n is 20 or more), m slots 33 and 34 on the upper end side and the lower end side (usually 3 to 6 slots) In the case of punching, the width of the magnetic pole shaft piece 12a (see FIG. 3) of the uppermost and lowermost divided core pieces 21 and 22 is gradually increased, and the width w of the normal magnetic pole shaft piece 12a is gradually increased. And

Therefore, when forming the slots 33 and 34 of the n divided core pieces 21 and 22 in the steps 2 and 3, the first m divided core pieces 21 or 22 (in FIG. 1B) The first of the divided core pieces 21) brings the punch and die closer to the center of the strip 30, and the second one is a little distance away (for example, about 0.5 to 3 times the plate thickness) from the center. This operation is performed up to the m-th sheet. Then, in the last m pieces of divided core pieces 21 or 22, the punch and die are gradually moved to the center of the strip 30, and the slots 33 and 34 are punched.
FIG. 3 shows three of the divided core pieces 21 at the time of completion. The widths of the magnetic pole piece 12a and the magnetic pole piece 13a become narrower in the order of (A), (B), and (C). ing.

Thus, when the divided core pieces 21 and 22 are laminated, the divided laminated core 10 in which the left and right corner parts 15 and 16 of the magnetic pole shaft part 12 are rounded as shown in FIG. Is formed. Further, when the slots 33 and 34 are formed in this way, the corner portions 17 and 18 at the upper and lower ends of the radially outer portion of the magnetic pole tooth portion 13 whose outer sides are obtuse with respect to the magnetic pole shaft portion 12 are also rounded. In other words, a split laminated iron core 10 having a reduced angle is formed. As a result, the magnetic pole teeth 13 have a narrower radial width toward both sides in the circumferential direction, and the radial widths on the upper and lower lamination sides of the magnetic pole teeth 13 are gradually reduced. The distance between the outer side in the radial direction and the inner side in the radial direction of the divided yoke portion 11 gradually widens at the upper and lower ends.

In step 4, the connecting portion of the split core piece 21 on one side is removed. In this case, one side (the lower side in FIG. 2) forms a cutout 24 on the other side of the protrusion 23. The split core piece 22 on the other side passes this step 4. Then, in step 5, the connecting portion of the other divided core piece 22 is removed, and the cut portion 25 is formed on one side and the protruding portion 26 is formed on the other side. Step 5 passes without processing the split core piece 21 on one side.

In step 6, the cutouts 35 and 36 at the ends of the magnetic pole tooth pieces 13a of the divided core pieces 21 and 22 are performed. It should be noted that the punch and die that perform the cutouts 35 and 36 at the end of the magnetic pole piece 13a in step 6 are pressed in the direction of the pressing line of the magnetic pole piece 13a (that is, the circumferential direction in the direction of arrow a or the circumferential direction in the direction of arrow b). ), The divided laminated iron core 10a in which the magnetic pole teeth 13p are skewed as shown in FIGS. 4A and 4B can be formed. Here, if the thickness of the laminated core is T, and the circumferential phase distance between the upper end and the lower end of the magnetic pole teeth 13p of the laminated core is H, the skew angle α is arctan H / T. The phase distance H is 0.8 to 5 times the gap G between the magnetic pole tooth portions of the adjacent divided core pieces at the same height when the adjacent magnetic pole tooth portions 13p are viewed in plan (preferably 1. It is better to set it in the range of 2 to 2.5 times. If the number of the laminated core pieces 21 and 22 stacked is n, the minute distance k is H / n.

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 performing the cutouts 35 and 36 at the end of the magnetic pole piece 13a are moved back and forth in the pressing line direction (that is, the circumferential direction) of the magnetic pole piece 13a, so that FIG. As shown in the figure, the split laminated iron core 10b can be formed by forming a bent skew in the magnetic pole tooth portion 13q. In any case, since the magnetic pole shaft portion 12 is straight (vertical) in the vertical direction, the winding can be performed with good workability, and the winding is made with a high space factor.

In step 7, the cutout 37 of the locking portion 28 of the divided core pieces 21 and 22 is performed. In step 8, the caulking hole (an example of the caulking portion) 39 of the divided core piece (the divided core piece 21 in this embodiment) located at the lowermost portion of the divided core pieces 21 and 22 is punched. Processing of the caulking portions (half punched recesses and half punched projections) 27 of the divided core pieces 21 and 22 is performed.

In step 10, the divided core pieces 21, 22 are extracted and caulked in a die to form a divided laminated core 10. In this way, after a predetermined number of divided laminated iron cores 10 are manufactured and wound, the divided laminated iron cores 10 are connected via the connecting portions 19 and 20, and the laminated portions are separated by inserting a jig in the locking portion 28. The iron core 10 is fixed and assembled in a ring shape.
The present invention is not limited to the embodiment described above, and the shape and numerical value can be changed without departing from the scope of the present invention.

(A) is a top view of the division | segmentation laminated | stacked iron core of the laminated iron core which concerns on one embodiment of this invention, (B) is arrow XX sectional drawing. It is explanatory drawing which shows the process of the manufacturing method of the same laminated iron core. (A)-(C) is a top view of a division | segmentation iron core piece, respectively. (A), (B) is explanatory drawing of the division | segmentation laminated | stacked iron core used for the laminated iron core which concerns on other embodiment of this invention, (C) is the division | segmentation used for the laminated iron core which concerns on further another embodiment of this invention. It is explanatory drawing of a laminated iron core. It is a division | segmentation laminated | stacked iron core which concerns on a prior art example, Comprising: (A) is a top view, (B) is YY sectional drawing. It is explanatory drawing which shows the other example of the conventional division | segmentation laminated | stacked iron core.

Explanation of symbols

10, 10a, 10b: Divided laminated iron core, 11: Divided yoke portion, 12: Magnetic pole shaft portion, 12a: Magnetic pole shaft piece portion, 13, 13p, 13q: Magnetic pole tooth portion, 13a: Magnetic pole tooth piece portion, 14: Magnetic pole portion 15-18: Corner part, 19, 20: Connection part, 21, 22: Divided core piece, 23: Projection part, 24, 25: Cut part, 26: Projection part, 27: Caulking part, 28: Locking part , 30: strip material, 31, 32: pilot hole, 33, 34: slot, 35-37: cutout, 39: caulking hole

Claims (4)

The core pieces are divided by caulking and laminated for each magnetic pole, and the widths of the top and bottom layers of the magnetic pole shaft are gradually reduced. The magnetic pole shaft is spread radially on both sides in the circumferential direction. A laminated core that connects a plurality of divided laminated iron cores having magnetic pole teeth that are formed in an arc shape at the radially inner end via connecting parts formed on both sides of a divided yoke part of the divided laminated core. In
The width of the magnetic pole tooth portion in the radial direction is reduced toward both sides in the circumferential direction, and the radial width of the magnetic pole tooth portion on the upper end side and the lower end side of the stack is gradually reduced. A laminated iron core characterized in that the distance between the outer side and the inner side in the radial direction of the divided yoke part gradually widens at the upper and lower ends. 2. The laminated core according to claim 1, wherein a radially outer side of the magnetic pole tooth piece portion of the divided iron core piece is linear. 3. 3. The laminated core according to claim 1, wherein a skew is formed in the laminating direction in the magnetic pole tooth portion. 4. The laminated core according to any one of claims 1 to 3, wherein the magnetic pole shaft portion is straight in the lamination direction.

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