JP4965202B2 - Armature core and manufacturing method of the armature core - Google Patents

Description

  The present invention relates to an armature core of an outer rotor type electric motor configured by combining a plurality of divided portions and a method for manufacturing the same.

An electric motor of a type having a cylindrical shaft fixed at the center, an armature fixed to the shaft, and a rotor rotating outside the armature is called an outer rotor type motor. In a conventional outer rotor type motor, a thin silicon steel plate (magnetic plate) punched by a press is laminated as the iron core of the armature (stator) fixed to the shaft, and integrated by caulking or welding The iron core is used. Further, in order to increase the space factor of the winding, improve the workability of the winding, and improve the yield of the core material, a split type core structure in which the core is divided in the circumferential direction is adopted.
For example, Patent Document 1, Patent Document 2, and Patent Document 3 show a method of forming an armature (stator) by winding a core on a magnetic pole divided into magnetic poles and arranging them in a circle and then assembling them together. Has been.

  In Patent Document 1, the laminated partial cores laminated to a predetermined thickness are arranged on the circumference, and the concave portions and the convex portions provided in the respective back yoke portions are fitted into the convex portions and the concave portions of the adjacent yokes, respectively. However, since it is press-fitted when fitted, the pressure input increases when the number of stacked layers is large or when the number of slots (the number of magnetic poles) is large and the number of slots is large. There is a problem that the jig to be assembled becomes large. Also, all the split cores must be pressed and pressed in such a way that a force is applied evenly in the circumferential direction at the same time, and the jig that can apply such a force has a complicated structure. is there.

  Further, in Patent Document 2, a method of assembling the back yoke divided parts as an upward hook claw and a downward hook claw and assembling them integrally using pins is shown, but in this case, the number of pins required is the number of divisions. There is a problem of becoming. That is, extra parts other than the iron core must be prepared for assembling the iron core.

Further, in Patent Document 3, in order to solve the problems of Patent Documents 1 and 2, the split portion of the back yoke is composed of an upper protrusion and a lower protrusion, and can be assembled together with a smaller force than that of Patent Document 1. It is configured to be able to. However, even in this method, after all the divided cores are arranged on the circumference, it is necessary to configure the jig so that force is applied evenly at the same time. If the diameter is large and the number of slots is large, the jig is large. There is a problem of becoming more complicated and complicated.
JP 2001-251792 A JP 2000-50583 A JP 2003-199270 A

Since the armature core of the conventional outer rotor type motor is configured as described above, it is arranged on the circumference when the concave and convex portions provided in the back yoke portion of the divided core are fitted. Later, all the iron cores had to be pressed uniformly, the manufacturing method was complicated, the jigs to be assembled were also complicated, and there was a problem of increasing the size.
In addition, when assembling, there is a problem that parts for assembling are required in addition to the iron core.

  The present invention has been made to solve the above-described problems. Even when the number of laminated magnetic plates is large or when the number of slots is large and the number of slots is large, the manufacturing method is simple and the assembly is easily performed with a small pressure input. Therefore, it is an object of the present invention to provide an armature core that does not require special special assembly jigs and does not require special parts for assembly other than the iron core, and a method for manufacturing the same.

The armature core of the present invention is a magnetic plate having a trapezoidal back yoke portion having a long side, a short side and two side sides, and a teeth portion connected to the long side in a T-shape,
A first convex portion provided on one side of the back yoke portion and having a tip width larger than a base width, an internal width provided on the other side and larger than an opening, and its shape is A first iron core plate having a first recess having the same shape as the first protrusion,
A rectangular second protrusion having a width the same as the width of the opening of the first recess, provided on one of the sides of the back yoke portion, and the width of the second protrusion provided on the other side. A second iron core plate having a second concave portion that is a rectangle having the same width as the width of the tip of the convex portion;
The first core core plate and the second core core plate are laminated in a predetermined order and are partially fixed to each other.
A plurality of partial cores arranged in an annular shape by fitting the second convex portion into the second concave portion of the adjacent partial core in the first concave portion of the partial core adjacent to the first convex portion. ,
The number of laminated magnetic plates of the first iron core plate is smaller than the number of laminated magnetic plates of the second iron core plate .

The armature core manufacturing method of the present invention produces a magnetic plate having a trapezoidal back yoke portion having a long side, a short side and two sides, and a tooth portion connected to the long side in a T-shape. The process of
A first convex portion having a tip width larger than the base width is provided on one of the side sides of the back yoke portion, and an internal width larger than the opening is provided on the other side, and the shape thereof is the first side. Providing a first recess having the same shape as the projection to form a first iron core plate,
A rectangular second convex portion having the same width as the opening of the first concave portion is provided on one side of the back yoke portion, and the width of the first convex portion is provided on the other side. A step of providing a second recess that is a rectangle having the same width as the width of the tip of the second core element plate,
The first iron core plate and the second iron core plate are laminated in a predetermined order, and the number of laminated magnetic plates of the first iron core plate is the number of laminated magnetic plates of the second iron core plate. Less , the process of fixing to each other to make a partial iron core,
A plurality of the partial cores are arranged in a ring shape and shifted in the stacking direction, and the first convex portions of one partial core are arranged in the second concave portions of the adjacent partial cores. Inserting the second convex portion into the first concave portion of the adjacent partial core, and placing the side edges of the partial cores in contact with each other;
The arrayed partial iron cores are slid in the stacking direction, the first convex portions are fitted into the first concave portions of the adjacent partial cores, and the second convex portions are the second concave portions of the adjacent partial cores. it is intended to include the step of fitting the.

  According to the armature core and the manufacturing method thereof of the present invention, when assembling the partial core, it is possible to connect by press-fitting only a part of the total thickness of the laminated layers, so that the press-fitting fitting force is reduced. be able to. Therefore, even a motor having a large diameter or a motor having a large number of stacked layers can be easily assembled with high accuracy, and the structure of a jig for assembly can be simplified.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a plan view showing an armature core 100 (entire combination of partial cores 90) according to Embodiment 1 of the present invention, and FIG. 2 is a detailed view showing the structure of one partial core 90 of the armature core 100. is there. As shown in FIG. 1, the armature core 100 of the present invention is configured by combining a plurality of partial cores 90 arranged on the circumference. The partial iron core 90 includes a trapezoidal back yoke portion 51 (having a long side Q and a short side X and two side sides Y and Z) and a teeth portion 50 connected to the long side Q of the trapezoid in a T shape. Have. Moreover, the partial iron core 90 has the 1st convex core 1 which has the 1st convex part 1a shown in FIG. 3 in the side Y of the back yoke part 51, and the 1st recessed part 1b in the side Z, and the back yoke part. A second core element plate having a second convex portion 2a on the side Y of 51 and a second concave portion 2b on the side Z is arranged in a plurality of layers in a predetermined order (in FIG. 2, as an example The first iron core plate 1 is arranged in three layers and the second iron core plate 2 is arranged in two layers alternately). Each iron core plate is formed by laminating one or more thin magnetic plates (not shown alone) and integrated by caulking, welding, or bonding not shown.

  The magnetic plate will be described in detail with reference to FIGS. The material of the magnetic plate is, for example, a silicon steel plate. This magnetic plate has a trapezoidal shape, and its short side X has an arc shape recessed inward. An arbitrary fourth side (long side of the trapezoid) having a side Y at one end of the short side X and a side Z at the other end and further provided between the two sides Y and Z. It has Q. A range surrounded by the short side X, the side side Y, the side side Z, and the long side Q is referred to as a back yoke portion 51. A plurality of back yoke portions 51 are arranged on the circumference in contact with the short side X, and the annular sides can be formed by making the side sides Y and Z contact each other. On the long side Q of the back yoke portion 51, there is a teeth portion 50 provided in a T shape toward the outside.

  In order to show the structure of FIG. 2 in more detail, FIG. 3 shows the first iron core plate 1 and FIG. 4 shows the second iron core plate 2. The first iron core plate 1 and the second iron core plate 2 both have one or more magnetic plates having the same shape of the teeth portion 50 and the back yoke portion 51 (excluding the difference in the shape of the protrusion / recess). The same number of layers are stacked. The first convex portion 1a is formed on the side Y of the first core plate 1, the first concave portion 1b is formed on the side Z, the second convex portion 2a is formed on the side Y of the second core plate 2, The side Z is provided with a second recess 2b. The shape of the first convex portion 1 a is a shape whose tip is larger than the base (trapezoid as an example in FIG. 3), and the upper side (short side) of the trapezoid is in contact with the side Y of the back yoke portion 51. That is, the base portion (base portion) has a narrow width and the tip has a wide width. The shape of the first recess 1 b is also a trapezoid having the same shape, and is provided so that the upper side (short side) of the trapezoid is in contact with the side Z of the back yoke portion 51. That is, the cut has a shape in which the width of the opening is narrow and the width of the back is wide. And the 1st convex part 1a is the same shape as the 1st recessed part 1b (only the difference of a convex and a concave). However, the height of the first convex portion may be slightly smaller than the height of the first concave portion (in the figure, it is set as minus α, α is a dimension in μ units). The dimensions of each side of the first convex portion and the first concave portion are shown in FIG. 5 are position reference lines for explaining the positions of the respective convex portions / concave portions, and all the distances from the short side X of the back yoke portion 51 are unified to the same (A). Yes. The apparent shape of the convex part 80 and the concave part 81 of FIG. 2 is shown in FIG.

The first iron core plate 1 is provided with a first convex portion 1a having a tip width larger than the base width toward the outside on the side Y of the magnetic plate, and an opening toward the inside on the side Z. One or more layers each having a first concave portion 1b having an internal width larger than the width and having the same shape as the first convex portion 1a are laminated.
The second iron core plate 2 is provided with a second convex portion 2a having a rectangular shape on the side Y of the magnetic plate, the width of which is the same as the width of the opening of the first concave portion 1b. One or more sheets each having a second recess 2b having a rectangular shape whose width is the same as the width of the tip of the first protrusion 1a are stacked on Z.

As is clear from FIG. 5, when the first convex portion 1 a of one first iron core plate 1 is press-fitted into the first concave portion 1 b of another first iron core plate 1, the first iron core plate 1 is fixed and fitted together. However, since the width of the tip of the first convex portion 1a is larger than the width of the opening of the first concave portion 1b as described above, the first convex portion 1a cannot be directly inserted in the same plane. It is performed from the direction orthogonal to the paper surface of FIG.
Moreover, the 2nd convex part 2a and the 2nd recessed part 2b of the 2nd iron core base plate 2 are both simple rectangles. The dimensions of each side are shown in FIG. The width of the portion in contact with the side Y of the second convex portion 2a is the same as the width L3 of the root (base) of the first concave portion 1b. The width L2 of the portion of the second recess 2b in contact with the side Z of the second core element plate is the same as the width L2 of the maximum portion of the first protrusion 1a. That is, the 2nd convex part 2a becomes a shape which can be easily inserted in both the 1st recessed part 1b and the 2nd recessed part 2b from the direction parallel to the paper surface of a figure. Moreover, the 1st convex part 1a becomes a shape which can be easily inserted from the direction parallel to the paper surface of a figure with respect to the 2nd recessed part 2b.
In order to help understanding, FIG. 7 shows the relationship between the first convex portion, the first concave portion, the second convex portion, and the second concave portion, which can be inserted from a direction parallel to the surface. That is, both the first convex portion 1a and the second convex portion 2a can be inserted into the second concave portion 2b from the horizontal direction, but only the second convex portion 2a can be inserted into the first concave portion 1b. One convex part 1a cannot be inserted from the horizontal direction, and can only be inserted from above or below the page.

  The method of assembling the partial iron core will be described later, but the structure after the assembly of the armature iron core of the present invention is completed. The first convex portion 1a of one partial iron core is fitted into the first concave portion 1b of the adjacent partial iron core, and the second convex portion 2a of one partial iron core is fitted into the second concave portion 2b of the adjacent partial iron core. Arranged to mate.

After understanding the relationship of FIG. 7, the basic assembly principle of the armature of the present invention, that is, how to combine the partial cores 90 will be described with reference to FIG. 8.
FIG. 8 shows two partial iron cores 90a and 90b having the same structure as each other to help understanding. These two have the same structure, but are given different reference numbers for convenience of explanation. In order to help understanding, the simplest case is shown in which each partial iron core has only two original plates, one first iron core plate 1 on the upper side and one second iron core plate 2 on the lower side. The first iron core plate 1 and the second iron core plate 2 are fixed to each other by welding or adhesion (not shown). To combine the partial iron core 90a and the partial iron core 90b, first, the first convex portion 1a of the first iron core plate 1 of the partial iron core 90b is changed to the second concave portion of the second iron core plate 2 below the partial iron core 90a. 2b is inserted from the horizontal direction. In this case, based on the relationship shown in FIG. 7, the first convex portion 1a of the first core plate 1 of the partial core 90b is horizontal to the second concave portion 2b of the second core plate 2 below the partial core 90a. Since the second iron core plate 2 on the lower side of the partial iron core 90b is easily inserted from the direction, the second iron core plate 2 on the lower side of the second iron core plate 2 of the partial iron core 90a enters into an empty area. Can be inserted as easily. As a result, as shown in FIG. 9, the partial iron core 90a and the partial iron core 90b are in contact with each other in a state of being shifted by one step.

  Next, the partial iron core 90b is slid from the lower side to the upper side in FIG. 9, that is, in the stacking direction. At this time, the first convex portion 1a of the first iron core plate 1 of the partial core 90b enters the first concave portion 1b of the first iron core plate 1 of the partial iron core 90a, but the dimensions of the concave portion and the convex portion are substantially the same. Therefore, it will be press-fitted, firmly fixed, and in the state shown in FIG.

  The above operation will be described again using a more specific example that constitutes the entire armature. FIG. 11 is a diagram in which the partial iron cores 90 are arranged on the circumference when starting to assemble the armature. Although not clearly shown in the drawing, the partial iron cores 90 are arranged one by one up and down. The arrows in the figure indicate that the partial iron cores 90 are all moved toward the center of the circle to combine the convex portions and the concave portions. This combination procedure will be described with reference to FIG. 12 to FIG. FIG. 12 shows four stages of the first core element plate 1 formed by stacking n magnetic plates and seven stages of the second core element plate 2 configured by stacking n magnetic plates. It is the figure which showed the state which assembled the partial iron core 90 of a structure. 12A is a cross-sectional view seen from a direction parallel to the surface of the magnetic plate, FIG. 12B is a cross-sectional view taken along line AA of FIG. 12A, and FIG. 12C is FIG. It is BB sectional drawing of. When the adjacent partial cores 90 are brought close to each other as shown in FIG. 12A, as shown in FIG. 12B, the partial cores 90b are made only by the thickness of the first iron core plate (the number of laminated magnetic plates n). Arranged by shifting in the stacking direction (downward here), the partial core 90a or 90b is moved in the circumferential direction as shown in FIG. 12A, and the convex portion is inserted into the concave portion. At this time, the upper two positions among the first convex portions 1a of the three first core sheets 1 of the partial core 90b are changed to the second concave portions 2b of the second core sheets 2 of the two partial cores 90a. Easy to insert. And one place of the lowest layer moves to the place where there is no partner. Moreover, the 2nd convex part 2a of the 2nd core sheet 2 of the partial core 90b is easily inserted in the 1st recessed part 1b of the 1st core sheet 1 of the partial core 90a. The inserted results are as shown in FIGS. 13 (a), (b), and (c). FIGS. 13A, 13B, and 13C are views after insertion corresponding to FIGS. 12A, 12B, and 12C, respectively.

  After the partial core 90a and the partial core 90b are in close contact with each other by the above insertion, the levels are adjusted by moving the partial cores in the stacking direction as shown in FIGS. 14 (a), 14 (b), and 14 (c). By being press-fitted), they are fixed to each other. At this time, the first convex portion 1 a of the first iron core plate 1 is press-fitted into the first concave portion 1 b of the first iron core plate 1 of the adjacent partial iron core 90. The press-fitting force is only the number of the first core core plate 1 out of the total number of laminated cores, and the press-fitting can be performed with a smaller force than when the total number of laminated cores are press-fitted. Moreover, the operation of press-fitting in the stacking direction can be performed by moving all the partial iron cores simultaneously, or can be press-fitted one by one sequentially (described in the second embodiment), one by one. When performing, it can press-fit with much less force. In addition, the 2nd convex part 2a bears the role which hold | maintains a position when sliding and guides so that excessive force may not be applied to the 1st convex part 1a.

  In the above description, since the first core sheets 1 are fixed to each other by press fitting, when the partial core 90 is configured, the first core sheets 1 are arranged at the uppermost part and the lowermost part. It is preferable not to arrange the iron core plate 2 at the top and bottom. That is, the number of the first core sheets 1 is an even number and the number of the second core sheets 2 is an odd number, but this is not so much. That is, it is only necessary to alternately stack the first iron core plate 1 and the second iron core plate 2. The number n of stacked magnetic plates is, for example, several to several tens.

Embodiment 2. FIG.
12 to 14 of the first embodiment, it has been described that all the partial iron cores are inserted at the same time. However, as shown in FIG. 15, a plurality of partial iron cores 90 (for example, four) are inserted by the above procedure. First, a plurality of partial core groups 101 are manufactured by press-fitting and fixing. Next, the necessary number of partial core groups 101 are arranged on the circumference and inserted into each other for press-fitting and assembly. In FIG. 15, one partial iron core group 101 is described as connecting four partial iron cores 90. However, the number may be any number as long as it is two or more, and each group may have a different number of partial iron cores. When assembling the whole as shown in FIG. 11 of the first embodiment, some holding tool is required. However, if partial assembly is stacked as in the present embodiment, a special holding tool is required. It can also be assembled manually.

Embodiment 3 FIG.
FIG. 16 is a plan view showing an armature core (a state before combination) according to Embodiment 3 of the present invention. The partial iron core 91 of the present embodiment integrally has a plurality of teeth portions 20 (four examples are shown in FIG. 16) arranged in an arc shape on one back yoke portion 51 bent in an arc shape. The first core plate 21 having the first convex portion 1a at one end and the first concave portion 1b at the other end, and the same number of teeth portions 20 are integrally provided, and the second convex portion 2a is provided at one end. Those having the second recess 2b at the end are stacked in a predetermined order (for example, alternately). The shape of the 1st convex part 1a, the 1st recessed part 1b, the 2nd convex part 2a, and the 2nd recessed part 2b is the same as that of Embodiment 1. FIG. Further, since the structure in the thickness direction is the same as in the first embodiment, the description thereof is omitted.
In the assembling method, as shown by the arrows in FIG. 16, the adjacent partial cores 91 are brought close to each other, and at that time, they are shifted in the stacking direction (up or down) by the thickness of the first core core plate 21. The subsequent procedure is the same as in the first embodiment. FIG. 17 shows the armature core 200 assembled as described above.

Embodiment 4 FIG.
In the first embodiment, it has been described that the number of laminated magnetic plates of the first core plate 1 and the number of laminated magnetic plates of the second core plate 2 are the same. That is, the thickness of the first core element plate 1 and the thickness of the second core element plate 2 are the same. However, since there is an error in the thickness of the magnetic plate, it cannot be said that the laminated thickness is exactly the same.
Here, for the sake of explanation, FIG. 18 shows a view of the convex portion 80 and the concave portion 81 of the partial iron core 90 of FIG. The figure of the convex part 80 shows the shape of the tip of the convex part 80, and the figure of the concave part 81 shows the shape of the entrance (opening) of the concave part 81. In general, the error in the stacking dimension (the error in the height direction) is very large compared to the machining accuracy, so that the height dimension of the first protrusion 1a in FIG. 18 is smaller than the height of the second recess 2b. May occur. In this case, as a matter of course, there arises a problem that it cannot be easily inserted in a direction parallel to the surface of the magnetic plate.

FIG. 19 is a diagram showing a configuration of a laminated portion of the different-number-shaped partial iron core 92 according to the fourth embodiment for solving the above problem. In the present embodiment, the number of laminated magnetic plates constituting the first core element plate 1 of the partial core 90 shown in the first embodiment is N, and the number of laminated magnetic plates of the second core element plate 2 is M. And N <M.
FIG. 20 is a view of the convex portion 80 and the concave portion 81 of the different-number-shaped partial iron core 92 of FIG. 19 as viewed from the front. The figure of the convex part 80 shows the shape of the tip of the convex part, and the figure of the concave part 81 shows the shape of the entrance of the concave part.
By setting N <M, as shown in FIG. 20, when the first convex portion 1a is inserted into the second concave portion 2b from the direction parallel to the surface of the magnetic plate, the number N of the first core core plates 1 is larger than the number N. Since the number M of the second core core plates 2 is larger, even if the positions of the adjacent partial cores have a slight error in the stacking direction or there is a thickness deviation of the stacked steel plates, they can be easily inserted. it can. Since how much M should be increased with respect to N should be such that the expected thickness error can be sufficiently absorbed, as an example, it is preferable to set M to about 105 to 120% of N. . It is not preferable to make the difference between M and N extremely large, that is, to reduce N extremely, because the fixing force between the partial iron cores will be weakened.

Embodiment 5 FIG.
The other shape of the 1st convex part 1a and 1st recessed part 1b of Embodiment 1 is demonstrated. The shape of the first concave portion 1b is as long as the entrance is narrow and widened at the back, and the first convex portion 1a press-fitted from the vertical direction to the inside does not come out in the direction parallel to the surface. The shape other than the shape shown in the first form may be used. That is, as shown in FIG. 21A, the tip (in the back) may be rectangular. Further, as shown in FIG. 21 (b), the tip (back) may have a round shape. In these cases, although illustration is omitted, the second convex portion 2a has a width that can easily pass through the width of the entrance of the first concave portion 1b, and the second concave portion 2b has an easily rounded portion at the tip of the first convex portion 1a. It must be wide enough to pass through.

Embodiment 6 FIG.
Although the manufacturing method of the armature core of the first embodiment has been described in the first embodiment, the main points will be described again in order to facilitate understanding.
First, a magnetic plate is manufactured. This magnetic plate has a back yoke portion and a teeth portion connected in a T-shape. The back yoke portion is substantially trapezoidal. A trapezoid side Y connected to one end of the trapezoid short side X is provided. Further, a trapezoidal side Z connected to the other end of the short side X is provided. When a plurality of the magnetic plates are arranged on the circumference in contact with the short side X so that the side Y and the side Z of the adjacent magnetic plate are in contact with each other, an annular core is formed. On the long side Q of the trapezoid provided between the side edge Y and the side edge Z, a tooth portion 50 is provided outward.

Next, the first convex portion 1a having a tip width larger than the base width toward the outside is provided on the side Y, and the inner width greater than the opening width toward the inside is provided on the side Z. At the same time, the first iron core plate 1 is manufactured by laminating one or more magnetic plates provided with the first concave portion 1b having the same shape as the first convex portion 1a.
Next, on the side Y, the second convex portion 2a having the same rectangular shape as the width of the opening of the first concave portion 1b is provided outward, and the side Z is inwardly facing the inner side. One or more magnetic plates provided with a second concave portion 2b having a rectangular shape with a width equal to the width of the tip of the first convex portion 1a are laminated to manufacture the second iron core plate 2.
Next, the first iron core plate 1 and the second iron core plate 2 are laminated in a predetermined order (for example, alternately) and fixed to each other to manufacture the partial iron core 90.

Next, on the circumference in contact with the short side X, the first convex portion 1a of one partial iron core 90 is replaced with the second concave portion 2b of the adjacent partial core 90, and the second convex portion 2a of one partial iron core 90. Is inserted into the first recess 1b of the adjacent partial core 90, and the side Y of one partial core 90 is arranged so as to contact the side Z of the adjacent partial core.
Then, the arranged partial iron core 90 is slid in the magnetic plate stacking direction so that the first convex portion 1a of one partial iron core is fitted into the first concave portion 1b of the adjacent partial iron core, and the second of the one partial iron core is fitted. The convex portion 2a is fitted into the second concave portion 2b of the adjacent partial iron core. At this time, it is a press-fitting operation.

  The armature core and the manufacturing method thereof according to the present invention can be applied not only to an armature fixed to an outer rotor type rotating electric machine but also to an armature rotating by a rotating electric machine that is not an outer rotor type.

FIG. 3 is a plan view of the armature core according to the first embodiment. It is a perspective view which shows the detail of the partial iron core of the armature iron core of FIG. It is a perspective view of the 1st iron core base plate which comprises the division part of FIG. It is a perspective view of the 2nd iron core base plate which comprises the division part of FIG. It is a dimension explanatory drawing of the convex / concave part of the 1st iron core base plate of FIG. It is a dimension explanatory drawing of the convex / concave part of the 2nd iron core base plate of FIG. It is a figure explaining the relationship of the propriety of insertion of each convex recessed part. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. FIG. 3 is a diagram for explaining a method for assembling a partial iron core according to the first embodiment. 6 is a plan view of an armature core according to Embodiment 2. FIG. FIG. 10 is a plan view in the middle of assembly of the partial iron core according to the third embodiment. It is a top view of the partial iron core of FIG. It is a figure which shows the shape of the convex part and recessed part of the partial iron core of FIG. 2 of Embodiment 1. FIG. FIG. 6 is a cross-sectional view of an armature core according to a fourth embodiment. It is a figure which shows the shape of the convex part and recessed part of a partial iron core of FIG. It is a figure which shows the shape of the 1st convex part of Embodiment 5, and a 1st recessed part.

Explanation of symbols

1, 21 1st iron core plate, 2 2nd iron core plate,
1a 1st convex part of a 1st iron core base plate, 1b 1st recessed part of a 1st iron core base plate,
2a 1st convex part of the 2nd core sheet, 2b 2nd recessed part of the 2nd core sheet,
50 teeth, 51 back yoke,
80 convex shape, 81 concave shape,
90, 90a, 90b Partial iron core,
91 multiple teeth type partial core, 92 different number type partial iron core,
100 armature cores, 101 partial core groups, 200 stator cores,
X arcuate side, Y first contact side, Z second contact side, Q fourth side.

Claims (4)

A magnetic plate having a trapezoidal back yoke portion having a long side, a short side and two side sides, and a teeth portion connected to the long side in a T-shape;
A first convex portion provided on one side of the back yoke portion and having a tip width larger than the base width, an internal width provided on the other side and larger than an opening width, and the shape thereof is A first iron core plate having a first recess having the same shape as the first protrusion,
A rectangular second protrusion having a width the same as the width of the opening of the first recess, provided on one of the sides of the back yoke portion, and the width of the second protrusion provided on the other side. A second iron core plate having a second concave portion that is a rectangle having the same width as the width of the tip of the convex portion;
The first core core plate and the second core core plate are laminated in a predetermined order and are partially fixed to each other.
Said first recess of said portion iron core adjacent the first convex portion, provided with a plurality of partial core having the by fitted to the second recess portion iron cores arranged in an annular adjacent said second protrusion ,
The armature core according to claim 1, wherein the number of stacked magnetic plates of the first core element plate is smaller than the number of stacked magnetic plates of the second core element plate .   The armature core according to claim 1, wherein the back yoke portion has a plurality of tooth portions. 3. The armature core according to claim 1 , wherein the partial core has a first core element plate disposed at an uppermost part and a lowermost part . 4. Producing a magnetic plate having a trapezoidal back yoke portion having a long side, a short side and two side sides, and a teeth portion connected to the long side in a T-shape;
A first convex portion having a tip width larger than the base width is provided on one side of the back yoke portion, and an internal width larger than the opening width is provided on the other side, and the shape thereof is the first side. Providing a first recess having the same shape as the projection to form a first iron core plate,
A rectangular second convex portion having the same width as the opening of the first concave portion is provided on one side of the back yoke portion, and the width of the first convex portion is provided on the other side. A step of providing a second recess that is a rectangle having the same width as the width of the tip of the second core element plate,
The first iron core plate and the second iron core plate are laminated in a predetermined order, and the number of laminated magnetic plates of the first iron core plate is the number of laminated magnetic plates of the second iron core plate. Less , the process of fixing to each other to make a partial iron core,
A plurality of the partial cores are arranged in a ring shape and shifted in the stacking direction, and the first convex portions of one partial core are arranged in the second concave portions of the adjacent partial cores. Inserting the second convex portion into the first concave portion of the adjacent partial core, and placing the side edges of the partial cores in contact with each other;
Slide the sequence portion iron core in the stacking direction, wherein the first protrusion is fitted into the first recess of the adjacent partial core, wherein the second recess portion iron core adjacent the second projecting portion method of manufacturing an armature core which comprises a step of fitting the.

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