JPH02299443A - Wound iron core for electric motors - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stator core of a DC or AC motor used in industrial machines such as robots, home appliances such as refrigerators, automobiles, etc. This invention relates to an improvement in a stator core manufactured by a wound core method (hereinafter referred to as a wound core for electric motors).

[Prior Art] Conventionally, stators for electric motors have been manufactured by laminating magnetic steel plates punched out using a press, as described in Japanese Patent Publication No. 60-46627, but this method had a poor material yield and Not only was this method inferior in productivity, but it was also not compatible with a wide variety of electric motors.

A single-turn iron core system has been developed to solve this problem. In this method, a piece of iron material is formed by alternately repeating teeth and slots along one end surface of a strip plate, and the one end surface is on the inner circumferential side, and a circle of a predetermined inner diameter is formed within the surface of the material. A wound core for a motor is manufactured by forming an arc-shaped iron piece and sequentially stacking the arc-shaped iron pieces so that the teeth and slots are aligned in the lamination direction between the layers.

By the way, in this type of wound core for electric motors, the teeth of the arc-shaped iron pieces that are sequentially laminated are aligned in the lamination direction between the layers,
It is necessary that they are aligned so that there is no deviation in the circumferential direction, and that they remain in that state without being disturbed until they are made into a product.

As a means for preventing the teeth from shifting in the circumferential direction in the conventional wound core system, for example, Japanese Patent Laid-Open No. 58-5
As described in Japanese Patent No. 8851, a wound core manufacturing apparatus is provided with alignment pins, and the pins are inserted between the teeth of the arc-shaped iron pieces to align the teeth. Furthermore, as described in Japanese Patent Publication No. 61-12468, after forming a wound core for an electric motor, a punch with a number of keys around the circumference is inserted into the center of the wound core, and some of the keys are wound. A method of aligning the teeth by inserting the iron core between the teeth is known. Furthermore, as described in Japanese Unexamined Patent Publication No. 60-200746, there is a method in which press grooves are provided on the inner periphery of arcuate iron pieces, and the arcuate iron cores are sequentially laminated using the press grooves as a guide.

On the other hand, there is also a method in which arc-shaped iron pieces are fixed together after forming them, and this is disclosed in Japanese Patent Application Laid-Open No. 57-755.
As described in Japanese Patent No. 51, there is a method in which half-opened protrusions are provided on the circumference of an arc-shaped iron piece, and the protrusions are welded together after lamination.

[Problems to be Solved by the Invention] In the above-mentioned prior art, the method of providing alignment pins in the wound core manufacturing apparatus is such that when there is misalignment in the wound core, the teeth of the wound core are temporarily aligned by inserting the pins. Even if they are aligned, when the restraint by the pins is removed, the internal strain that had been stored in the arc-shaped piece of iron is released,
Misalignment of the teeth of the wound core may occur.

This can also occur with the method of inserting a keyed punch into the center of the wound core, and either method requires a new teeth alignment step. In addition, the method of aligning the arcuate iron pieces by forming press grooves on the inner periphery requires space for the press grooves between the slots, making it impossible to increase the number of coils, which is not suitable for high-performance electric motors. There were problems such as not being able to hire them.

On the other hand, the method of welding the protrusions together requires a new welding process and a temporary fixing process to align the cores, which reduce production efficiency and increase the cost of the cores for electric motors. It was something to do.

The present invention solves the problems of the prior art described above, and provides a wound core for electric motors in which the teeth of the arc-shaped iron pieces are aligned in the lamination direction between layers, there is no deviation in the circumferential direction, and the core is inexpensive and easy to manufacture. Its purpose is to provide the following.

[Means for Solving the Problems] The structure of the wound core for a motor according to the present invention is to solve the above problems.

An iron piece material is formed by alternately repeating teeth and slots along one end surface of a strip plate, and repeatedly forming notches of the same shape along the other end surface. Form an arc-shaped iron piece with a predetermined inner diameter within the plane of the material so that the teeth are on the side,
In a wound core for a motor made of sequentially laminated C, a plurality of notches are provided with claws that extend from the notches in the lamination direction and are inserted into other notches so that the slots and notches are aligned between the layers in the lamination direction. , the claws are provided so that they do not interfere with each other, or teeth and slots are alternately formed along one end surface of the strip plate, and holes of the same shape are repeatedly drilled along the solid part. The iron piece material formed by the above-mentioned iron piece is formed into an arc-shaped iron piece with a predetermined inner diameter within the surface of the material so that the one end face is on the inner circumferential side, and this arc-shaped iron piece is formed into a circular iron piece with the teeth, slots, and punched holes. The plurality of punched holes are provided with claws that extend from the punched holes in the stacking direction and are inserted into other punched holes. It is designed to prevent interference.

More details are as follows.

An iron piece material is formed by alternately repeating teeth and slots along one end surface of a strip plate, and forming cutouts of the same shape at equal intervals on the other end surface to serve as refrigerant passages. , the notch is formed into an arcuate piece of iron so that it is on the outer circumferential side, and the pieces are laminated, and when forming the notch, in addition to a complete notch, An incomplete notch that is not completely formed is provided, a notch is made in this incomplete notch, and the part is bent in the axial direction of the arc-shaped iron piece (i.e., in the stacking direction) to use this as a claw. This is accomplished by inserting the claws into adjacent notches at the front of the circumference when manufacturing a wound core for a motor by laminating the arcuate iron pieces. Further, at this time, the claws are appropriately arranged so that a complete notch is located at the position where the claws are inserted.

[Effect] The arc-shaped iron piece is wound in a spiral shape, and.

It is a continuum. Therefore, in the entire wound iron core for an electric motor, there is at least one notch per turn of one arc-shaped iron piece.
Further, since the claws are inserted into the respective notches of at least one set (one set of two arranged in the stacking direction) of the arc-shaped iron pieces adjacent to each other in the stacking direction, the arc-shaped iron pieces are mutually circumferentially It will not deviate. Further, the arc-shaped iron pieces do not separate by themselves in the stacking direction due to the frictional force between the claws and the notches.

[Example] Hereinafter, the present invention will be explained by examples.

1 to 9 are for explaining a wound core for an electric motor according to a first embodiment of the present invention, FIG. 1 is a plan view of this wound iron core for an electric motor, and FIG. Figure 1 is a cross-sectional view taken along the line I--I in Figure 1, Figure 3 is a sectional view taken along the ■-■ arrow in Figure 2, and Figure 4 is
FIG. 5 is a front view of the iron piece material, FIG. 6 is a sectional view taken along the line mm in FIG. 5, and FIG. A schematic configuration diagram showing an example of a wound core manufacturing apparatus for manufacturing, FIG. 8 is a cross-sectional view taken along the line IV--■ in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line V-V in FIG. 7.

The outline of this wound iron core for electric motors will be explained using drawings. This core is formed by alternately repeating teeth 2 and slots 3 along one side end surface of a strip plate 7 (Fig. 5), and the other side. An iron piece material 17 formed by repeatedly forming notches 4 of the same shape along the end face is made into an arc-shaped iron piece 1' (with a predetermined inner diameter) within the material surface with the one end face facing the inner circumferential side. 7), and this arc-shaped iron piece 1' is formed into the teeth 2. Slot 3. It is made by sequentially laminating the layers so that the notches 4 are aligned in the lamination direction between the eyebrows, and the plurality of notches,
This is a wound core 1 for a motor (FIG. 1) in which claws 5 (details will be described later) extending from the notch in the stacking direction and inserted into other notches are provided so that the claws do not interfere with each other.

This will be explained in detail below.

This wound iron core 1 for an electric motor is made by laminating 50 (or 200) turns of arc-shaped iron pieces 1' in a spiral shape, and one turn of arc-shaped iron pieces 1' has 24 (
There are 4 notches (N=24).

Then, a pawl 5 (details will be described later) is provided for each of the five notches 4 (n=5), and this pawl 5 is located at a notch 4 that is offset by one position from the corresponding notch 4 of the previous arc-shaped iron piece 1'. Notch 4 (nX5=2
5=N-1, so it is inserted into the notch 4 (one piece deviates from the other), and is in close contact with the bottom of the notch 4, connecting the arcuate iron pieces 1 seamlessly in the stacking direction and in the circumferential direction. (Figure 4)
.

As shown in FIG. 5, the claws 5 have notches (this is a complete notch 4) formed at equal intervals along the other end surface of the strip plate 7 (this is a thin plate made of magnetic steel). and incomplete notches 6), each of the five incomplete notches 6
It is made by making cuts on both sides of the board and bending it in the board thickness direction (this is the stacking direction). The length of this claw 5 (Fig. 6) must be at least the thickness t of one turn of the arc-shaped iron piece 1' (i.e., the thickness of the strip) in order to prevent the claw 5 from coming off the inserted notch 4. (thickness of the plate 7) is necessary, and (n-1)× must be less than or equal to (n-1) in order for the claws 5 to not interfere with each other. It is necessary to make it smaller than H. Namely.

The dimensions may be within the range of t≦L≦(n-1)Xt≦H. In this example, L=2t. Further, the bending angle θ=90°. The tip of the claw 5 is chamfered to a depth of 0.5t to facilitate insertion into the notch 4.

Next, a method of manufacturing this wound iron core 1 for an electric motor will be briefly described.

First, the preforming process for obtaining the iron piece material 17 will be explained using FIG.

The strip 7 is sent to a progressive press (not shown), and in the first stage of the press die, the teeth 2. Slot 3. Notch 4. Punch out the incomplete notch 6. In the next second stage, the incomplete notch 6 is made a notch and is bent downward (perpendicular to the plane of the paper in FIG. can get.

The forming process for manufacturing the wound core 1 for a motor from this iron piece material 17 will be explained using FIGS. 7 to 9.

The iron piece material 17 is the entrance guide 1 of the wound iron core manufacturing device.
0 between rolling rolls 8 and 9. A rolling roll 8 driven by an electric motor (not shown),
9, 50% or more of the width of the solid portion 18 of the iron piece material 17 is rolled so that the closer to the teeth 2 and the slots 3 the smaller the reduction ratio is, and the closer to the notches 4 and the claws 5 the larger the reduction ratio. do. The larger the rolling reduction ratio, the more the workpiece is stretched, so that an arc-shaped iron piece 1' having the notch 4 and the claw 5 as its outer periphery is formed.

The arc-shaped iron piece 1' formed by the rolling rolls 8 and 9 is
While being kept flat by the exit guide 11.11',
After going around the outer periphery of the core bar 12 by guide rollers 13, 14, 15, it is guided to the opposite side of the rolling rolls 8, 9. Furthermore, after half a turn, the claw 5 is pushed into the adjacent notch 4 one turn earlier by the push roll 16.

In this way, when a predetermined number of turns of arc-shaped iron pieces 1' are laminated, the wound core manufacturing apparatus is turned off, and the desired wound iron core 1 for an electric motor is obtained.

According to the embodiment described above, there are the following effects.

(2) The teeth 2 of the 00 arc-shaped iron 1' are aligned in the stacking direction between the layers, and there is no deviation in the circumferential direction.

@00 The arc-shaped iron pieces 1' are difficult to separate in the stacking direction, and the arc-shaped iron pieces 1' are fixed to each other.

Furthermore, the wound iron core 1 for an electric motor can be manufactured easily and inexpensively without using special equipment such as a welding machine or a caulking machine, or separate parts such as rivets or clasps.

In the present embodiment, the incomplete notches 6 of the band plate 7 are bent in advance to form the claws 5.

The arc-shaped iron pieces 1' were laminated to manufacture the wound iron core 1 for a motor.
is unfinished), and then the claw 5 is removed from the incomplete notch 6.
It is also possible to mold it. This example will be explained using FIG. 10.

FIG. 10 is a cross-sectional view of a main part showing another example of a wound core manufacturing apparatus for manufacturing a wound core for an electric motor.

In the figure, the same numbers as in FIG. 8 indicate the same parts. And 24 is a disc-shaped rotary tool. In this example, after laminating arc-shaped iron pieces 1, 1 disc-shaped rotary tool 2
4 in the stacking direction in the groove formed by the four rows of notches, bend the incomplete notches 6 scattered in the groove to form the claw 5, and insert the tip side into the other notches. 4.

Other embodiments will be described below.

11 to 15 are schematic diagrams showing claws of a wound core for an electric motor according to second to sixth embodiments of the present invention, respectively.

The claw 5A (FIG. 11) according to the second embodiment has its tip 19 bent back in the direction opposite to the direction in which the base is bent. This has the advantage that the tip portion 19 can be inserted into the notch 4 more easily.

The claw 5B (FIG. 12) according to the third embodiment has an R-shaped chamfer 20 on its tip side.

The claws 5C, 5D, and 5D' according to the fourth to sixth embodiments all have a wide tip portion, and the width is the same as the width of the bottom of the notch 4 into which the claw is inserted. This is what I did.

As explained in the first embodiment, when forming the arc-shaped iron piece 1', the iron piece material 17 is rolled at a larger reduction ratio as it approaches the notch 4, so that the width of the notch 4 is widened by this rolling. Become. Therefore, the width of the pawl 5 that is not subjected to this rolling becomes narrower than the width of the notch 4, and when the pawl 5 is inserted into the notch 4, a gap is created between the two. However, in order to more reliably prevent displacement of the arcuate iron piece 1' in the circumferential direction, it is preferable that there be no gap.

The fourth to sixth embodiments implement this measure,
The claw 5C according to the fourth embodiment has its tip rolled and made wider, and the claw 5D according to the fifth and sixth embodiments,
5D' has slits 23 and 23' formed at its tip, which are then expanded. The slit may be pushed and expanded after the claw is inserted into the notch 4, or the claw may be spread out in advance and then the claw is press-fitted into the notch 4.

16 and 17 are for explaining a wound core for an electric motor according to a seventh embodiment of the present invention, and FIG.
FIG. 17, which is a front view of the iron piece material, is a partially developed view of the outer periphery of this wound iron core for a motor. In the figure, the same parts are denoted by the same numbers as in FIGS. 4 and 5.

In this embodiment, the claw 5 is more flexible than in the first embodiment.
are arranged even more densely. That is, in this embodiment, one claw 5 is provided after one notch 4, and then two
One claw 5 is repeatedly provided after two notches 4, and the length of each claw 5 is equal to the thickness of the strip plate 7.

In the preforming process for obtaining the iron piece material 17A, as shown in FIG. In the next second stage, the incomplete notch 6 is formed.
Form the claws 5.

Then, using this iron piece material 17A, one roll is formed and laminated in the same manner as in the first embodiment to manufacture a desired wound core for a motor.

According to this embodiment, since the claws 5 are closely arranged,
This has the advantage that displacement of the arc-shaped iron piece in the circumferential direction is extremely unlikely to occur, and the fixing force of the wound iron core itself is increased.

The claws 5 in the embodiments so far all come into close contact with the bottom of the notch 4 into which the claws are inserted.
This may be in close contact with the side wall of the inserted notch. An example in which this type of claw is provided will be described with reference to the drawings.

18 to 22 are for explaining a wound core for an electric motor according to an eighth embodiment of the present invention, and FIG.
The partial plan view of the iron piece material, Figure 19, is its front view, Figure 2.
Figure 0 is a front view of this wound core for electric motor, Figure 21 is:
FIG. 20 is a VI-VI arrow view, FIG. 22 is a sectional view taken along ■-■ in FIG. 21, and FIGS. FIG. 2 is a partial front view showing an iron piece material for an iron core. In each episode, the same numbers as in FIGS. 1 to 5 indicate the same parts.

The pawls 25 and 25' according to the eighth embodiment have incomplete notches 6 at every fifth notch formed at equal intervals on the band plate.
A notch 6a is made in the circumferential direction (in FIG. 19, the circumferential direction is the left-right direction, and the radial direction is the up-down direction), and a further notch 6b is made in the radial direction to divide it into two parts in the circumferential direction. It is molded by bending it to both sides.

Then, this claw 25.25 is inserted into the notch 4 (second
(Fig. 0), and is in close contact with the side wall to prevent one arc-shaped iron piece from shifting in the circumferential direction, and also to fix the arc-shaped iron pieces to each other.

The claw 27.27 (FIG. 23) according to the ninth embodiment has a slit 28 circumferentially formed in the incomplete notch of the strip at the same depth as the notch 4, and A radial slit 28' is made in the center of the incomplete notch, and 1
It is formed by bending from the dotted chain line.

The claws 29 and 29' (Fig. 24) according to the tenth embodiment are as follows:
It is formed by making a notch 30.30' in the incomplete notch part of the strip plate and bending it from the dashed line, resulting in a high material yield and a large contact area between the notch 4 and the claw 29.29'. is large.

The claws 31, 31' (Fig. 25) according to the eleventh embodiment are as follows:
A part of the outermost periphery of the claws 27, 276 is removed, and there is an advantage that bending and forming can be performed accurately at the one-dot chain line.

The claws 32, 32' (Fig. 26) according to the twelfth embodiment are as follows:
Chamfers 33, 33' and 34, 34 are applied to the outermost periphery of the claws 27, 27' and the slit 28 side,
In this case as well, bending can be performed accurately at the dashed line.

The claws in each of the above embodiments are located on the outer peripheral side of the arc-shaped iron piece, extend from one notch, and are inserted into other notches. However, the position where the claws are provided is not limited to the outer circumferential side of the arc-shaped iron piece, but may be provided on the inner circumferential side.

This will be explained using drawings.

27 and 28 illustrate a wound core for an electric motor according to a thirteenth embodiment of the present invention, FIG. 27 is a partial front view of the iron piece material, and FIG. FIG. 2 is a cross-sectional view in the stacking direction.

As shown in FIG. 27, the claws 38 are formed by punching holes drilled at equal intervals along the solid portion of the strip plate 7 (this includes a complete punching hole 36 and an incomplete punching hole portion 37). ), of which
It is formed by bending every five incomplete punch holes 37. The pawls 38 are inserted into adjacent punch holes 36 before one circumference of the arcuate iron pieces to prevent displacement of the arcuate iron pieces in the circumferential direction and to fix the arcuate iron pieces to each other (28th figure).

Note that 39 is a semicircular outer peripheral notch formed at a position facing the slot 3 in order to make the area of the magnetic circuit uniform.

[Effects of the Invention] As explained in detail above, according to the present invention, a wound core for an electric motor that does not shift in the circumferential direction and is fixed by itself without performing outer circumferential welding or caulking is provided. However, it has the advantage that it can be obtained easily and inexpensively, and the material utilization efficiency is also high.

In short, it is possible to provide a wound core for an electric motor in which the teeth of the arcuate iron pieces are aligned in the stacking direction between layers, there is no deviation in the circumferential direction, and which is inexpensive and easy to manufacture.

[Brief explanation of drawings]

1 to 9 are for explaining a wound core for an electric motor according to a first embodiment of the present invention, FIG. 1 is a plan view of this wound iron core for an electric motor, and FIG. 1, FIG. 3 is a sectional view taken along the ■-■ arrow in FIG.
FIG. 6 is a front view of the iron piece material, FIG. 6 is a sectional view taken along the line ■-■ in FIG. , Figure 8 is
Fig. 7 is a sectional view taken along the rV-IV arrow, and Fig. 9 is
10 is a cross-sectional view of main parts showing another example of a wound core manufacturing apparatus for manufacturing a wound core for a motor, and FIGS. 2-6
16 and 17 are schematic diagrams showing claws of a wound core for an electric motor according to a seventh embodiment of the present invention, and FIG. is a front view of the iron piece material, FIG. 17 is a partial outer peripheral development view of this wound core for a motor, and FIGS. 18 to 22 are diagrams for explaining a wound core for a motor according to an eighth embodiment of the present invention. Fig. 18 is a partial plan view of the iron piece material, and Fig. 19 is a partial plan view of the iron piece material.
20 is a front view of this wound core for a motor, FIG. 21 is a view taken along the line VI-VI in FIG. 20, and FIG.
The figure is a sectional view taken along the line ■-■ in FIG. 21, and FIGS. 27°28
The figures are for explaining a wound core for an electric motor according to a thirteenth embodiment of the present invention, FIG. 27 is a front view of the iron piece material, and FIG. 28 is a view of this wound iron core for an electric motor. FIG. 3 is a cross-sectional view in the stacking direction. 1... Wound iron core for electric motor, 1'... Arc-shaped iron piece, 2
...teeth, 3...slot, 4...notch,
7... Band plate, 17.17A... Iron piece material, 5.5A
, 5B, 5C. 5D, 50', 25.25', 27.27', 29,2
9.31, 31, 32, 32, 38...claw, 36...
・Extraction hole.

Claims (1)

[Claims] 1. An iron piece material formed by alternately repeating teeth and slots along one end face of a strip plate, and repeating cutouts of the same shape along the other end face. , forming an arc-shaped iron piece with a predetermined inner diameter within the surface of the material so that the one end face is on the inner peripheral side, and forming this arc-shaped iron piece so that the teeth, slots, and notches are aligned between the layers in the stacking direction. In a wound core for a motor made of sequentially laminated layers, claws are provided in a plurality of notches to extend from the notches in the stacking direction and to be inserted into other notches, so that the claws do not interfere with each other. A wound core for electric motors featuring: 2. Claim 1 characterized in that, assuming that the number of notches per turn of the arc-shaped iron piece is N, a claw is provided for every n notches (n×integer=N±1). Wound iron core for electric motors as described. 3. The wound iron core for an electric motor according to claim 1, wherein the claws are formed by bending the remaining material resulting from the formation of the notch in the laminating direction without cutting it from the strip plate. 4. The wound core for an electric motor according to claim 3, wherein the tip of the claw is bent back in a direction opposite to the direction in which the claw is bent. 5. The wound iron core for an electric motor according to claim 1, wherein the claw is in close contact with the bottom of the notch into which the claw is inserted. 6. The wound iron core for an electric motor according to claim 5, wherein the width of the tip of the claw is equal to the width of the bottom of the notch into which the claw is inserted. 7. The wound iron core for an electric motor according to claim 1, wherein the claw is in close contact with a side wall of the notch into which the claw is inserted. 8. The wound iron core for an electric motor according to claim 1, wherein a slit is formed in the claw. 9. The wound iron core for an electric motor according to claim 1, wherein the claws are chamfered. 10. Teeth and slots are alternately formed along one end surface of the strip plate, and punch holes of the same shape are repeatedly drilled along the solid part. is formed into an arc-shaped iron piece with a predetermined inner diameter within the material plane, and the arc-shaped iron pieces are successively stacked so that the teeth, slots, and holes are aligned in the stacking direction between the layers. An electric motor characterized in that a plurality of the punched holes are provided with claws that extend from the punched holes in the stacking direction and are inserted into other punched holes so that the claws do not interfere with each other. Wound iron core.