JPH053648A - Laminated core for stator of motor and its manufacture - Google Patents

Abstract

PURPOSE:To mount a coil on a core without using any special jig, simplify a facility, and improve working efficiency by uniting main magnetic pole sections to one body by coupling the sections by means of upper and lower connecting magnetic pole core sections. CONSTITUTION:A laminated magnetic pole core section 24 is provided with a main magnetic pole section 25 and connecting magnetic pole sections 26 and 27. The main magnetic pole section 25 is formed by successively piling up a large number of magnetic pole pieces 17 divided into magnetic poles and polymerizing them together with glue and equally arranged in the radial direction so that gaps can be formed between each magnetic pole. The connecting magnetic pole core sections 26 and 27 divide the large number of main magnetic poles 25 into two or more groups and have magnetic pole core pieces 16 provided with connecting sections so as to fill the gaps between each magnetic pole belonging to each group. In addition, the sections 26 and 27 are formed by polymerizing together with glue the pieces 16 in the circumferential direction and firmly stuck to the upper and lower surfaces of each main magnetic pole section 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated iron core used for a stator of an electric motor, and in particular, it is composed of respective laminated magnetic pole iron core portions separated and laminated, and a laminated yoke iron iron core portion to which the laminated magnetic pole iron core portion is mounted. The present invention relates to a laminated core for a stator of an electric motor and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a stator core of an electric motor has a large number of inner magnetic poles 10 formed by press molding.
Stator core piece 12 press-formed with caulking projection 11
However, since the magnetic pole 10 is inside, winding is difficult and automation of winding work is also difficult. Therefore, the applicant of the present invention has previously proposed Japanese Patent Publication Sho 57
As disclosed in Japanese Patent No. 12378, the stator core is separated into an outer laminated yoke core portion and a laminated magnetic pole portion which is mounted on the laminated yoke core portion and divided into magnetic poles, thereby automating winding. A method of manufacturing a stator of a rotating electric machine that can be achieved has been proposed.

[0003]

However, in the stator of the rotating electric machine proposed in Japanese Patent Publication No. 57-12378, since the inner laminated magnetic pole portions are all disjointed, the laminated magnetic pole portions are arranged at predetermined positions. Therefore, there is a problem that a jig is required to hold the device and the device is complicated, and the manufacturing process is also complicated. Further, even if the electromagnetic steel sheet used is a standard one, there is a thickness deviation of about 1 to 3%, so if sheet-like electromagnetic steel sheets are sequentially pressed and laminated, the laminated iron core will also be used. 1 to
A height deviation of 3% may occur, which causes a problem that the mounting groove of the laminated yoke iron core portion is inclined and the laminated magnetic pole portion is difficult to mount. The present invention has been made in view of the above circumstances, and each laminated magnetic pole can be held at a predetermined interval without requiring a jig, and winding and pressing work can be easily performed. It is an object of the present invention to provide a laminated iron core for a stator of an electric motor and a method for manufacturing the laminated iron core, which can obtain a laminated iron core having a substantially uniform height and a very small inclination of a mounting groove even if an electromagnetic steel sheet having a large deviation of And

[0004]

According to a first aspect of the present invention, there is provided a laminated core for a stator of a motor according to claim 1, wherein a plurality of magnetic pole core pieces are arranged in a radial pattern along an inner circumference of the stator core. A yoke core piece having a mounting groove on the inside corresponding to the magnetic pole core piece is sequentially laminated and polymerized by using caulking protrusions arranged on each core piece A laminated core for a stator of an electric motor having a magnetic pole core portion, wherein the laminated magnetic pole core portion sequentially transposes and superposes a large number of magnetic pole core pieces divided for each magnetic pole, and between each magnetic pole. Main magnetic pole portions radially arranged so as to form a gap and upper and lower sides of the main magnetic pole portion are fixed to each other. The large number of magnetic poles are divided into two or more groups, and a gap between the magnetic poles belonging to each group is formed. Form a magnetic pole iron core group piece with a connecting portion so as to close it, and Heart group pieces to each other in the circumferential direction is composed of a rotational stacking polymerized connecting pole core portion. According to a second aspect of the present invention, a method of manufacturing a laminated core for a stator of an electric motor according to the first aspect of the present invention includes a plurality of magnetic pole core pieces radially and equally arranged along an inner circumference of the stator core, and the magnetic pole cores. A yoke iron core piece having a groove for mounting the piece is punched and formed, and the caulking protrusions arranged on each iron core piece are used to successively stack and polymerize in the mold to form a laminated magnetic pole core portion and a laminated yoke iron core portion. In a method of manufacturing a laminated core for a stator of an electric motor, which comprises a step of separately laminating, when a gap is formed in all of the plurality of magnetic pole core pieces, a region corresponding to the gap is preliminarily punched and formed. Forming a magnetic pole core group piece by punching out an air gap so as to leave a connecting portion that closes a gap between other magnetic pole core pieces except at least two gaps between the plurality of magnetic pole core pieces; At least a magnetic pole core group piece The sheets are sequentially transposed and polymerized in the mold to form a connecting magnetic pole core portion, and the main magnetic pole portion is formed by sequentially transposing and superposing the divided magnetic pole core pieces on the connecting magnetic pole core portion, And forming a laminated magnetic pole core portion by stamping and forming a connecting magnetic pole core portion on which at least two magnetic pole core group pieces having the same shape as the magnetic pole core group piece are sequentially transposed and polymerized. Has been done.

[0005]

In the laminated core for a stator of an electric motor according to claim 1, a main magnetic pole portion is formed by sequentially transposing and stacking magnetic pole core pieces divided for each magnetic pole, and a large number of them are provided above and below the main magnetic pole portion. Is divided into two or more magnetic pole core pieces, and a magnetic pole core group piece having a connecting portion that closes the gap between the magnetic pole core pieces is transposed in the circumferential direction to form a stack to eliminate the gap between adjacent magnetic poles. Since the magnetic pole core portions are joined together, the assembled laminated magnetic pole core portions are integrated. Since a gap is provided between the adjacent magnetic poles of the main magnetic pole portion, the magnetic resistance is increased, and thereby an efficient magnetic flux can be generated. The method of manufacturing a laminated core for a stator of an electric motor according to claim 2, wherein when a gap is formed in all of the plurality of magnetic pole core pieces, a region corresponding to the gap is preliminarily punched and formed. And a step of forming a magnetic pole core group piece by punching out an air gap so as to leave a connecting portion that closes a gap between other magnetic pole core pieces except at least two gaps between the plurality of magnetic pole core pieces. Thus, a magnetic pole core piece having a single magnetic pole and a magnetic pole core group piece having a plurality of magnetic poles connected to each other are formed in the same mold in accordance with the assembly situation in the subsequent process.
Then, first, at least two pieces of the magnetic pole core group pieces are transposed and joined to each other to form a connected magnetic pole core portion which is entirely connected in a mold,
Then, the magnetic pole core pieces separated from each other are gradually transposed and joined. As a result, even if there is a deviation in thickness of the pole core pieces that have been transposed and joined, the pole pieces are evenly divided, so that a laminated magnetic pole core portion having a substantially uniform height and having no inclination is formed.
Since the connected magnetic pole core portion, in which the magnetic pole core group pieces having the same shape as the magnetic pole core group pieces are transposed and joined, is placed on this, the main magnetic pole portions in which the respective magnetic pole core pieces are disjointed are coupled by the upper and lower magnetic pole core group pieces. Can be integrated.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic plan view for explaining a manufacturing process of a laminated core for a stator of an electric motor according to an embodiment of the present invention,
2 is the same perspective view, FIG. 3 is a partially omitted plan view showing the same assembled state, and FIG. 4 is the same perspective view.

First, a manufacturing and assembling process of a laminated core for a stator of an electric motor according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a strip 15 made of a silicon steel plate or the like showing a process of forming a magnetic pole core piece and a yoke core piece formed by press molding.
Divides a large number of magnetic poles into two or more groups (four groups in this embodiment), and manufactures a stator core including a magnetic pole core group piece 16 having a connecting portion so as to close the gap between the magnetic poles. , (B) show respective steps of manufacturing the stator core including the magnetic pole core pieces 17 divided for each magnetic pole.

The step A in FIG. 1 (a) shows a situation in which the punching punches for the intermittent operation do not project, whereby the connecting portions 18 for closing the gaps between the magnetic poles in the magnetic pole iron core group pieces 16 are finally made. Although formed, in step A in FIG. 1B, eight punches 19 project to form square holes, and finally the magnetic pole core pieces 17 divided for each magnetic pole are formed. The punches 19 are arranged on the same circumference, but two punches 19 form a group.

After that, the strip 15 on which both outer shapes, slots and the like are punched out by press molding and the caulking projections are formed, the strip 15 is punched by a punch 20 between the magnetic pole core group pieces 16 or between the magnetic pole core pieces 17 by a punch 20. Gap 21
Are formed as shown in step C. Then, as shown in the step D, a dividing line 22a is formed between the yoke 22 and the outer yoke core piece 23a by the punch 22, and the magnetic pole core group piece 16 or the magnetic pole core piece 17 is punched out, which is an example of a lower die. Do not insert into a blank die.

Therefore, when manufacturing the laminated core 23 for a stator of an electric motor according to an embodiment of the present invention, first, referring to FIG.
By the process shown in (a), the connecting portion 18 is formed without using the punch 19, and at the same time, the connecting portion 18 has three magnetic poles.
A piece of the magnetic pole core group piece 16 is manufactured, and is pulled into the blank die. Since the blank die is provided with a rotating mechanism having a blank holder and can rotate at every angle (α degrees) corresponding to the magnetic pole angles that are radially uniformly arranged, as shown in FIG. When the lowermost magnetic pole core group piece 16 is pulled out into the blank die, it rotates in the circumferential direction by α degrees, and the second magnetic pole core group piece 16 is shifted by α degrees and transposed and polymerized. After the two layers of magnetic pole core group pieces 16 are transposed and polymerized through such steps, the blank die is rotated,
A magnetic pole core piece 17 manufactured by dividing into 12 pieces at the same time through the step shown in FIG. 1B is transposition-polymerized on the magnetic pole core group piece 16, and thereafter a plurality of magnetic pole cores are subjected to the same step. Piece 17 is transposition polymerized.

Then, after the magnetic pole core piece 17 which is the third iron core from the top is transposed and polymerized, the magnetic pole core group piece 16 manufactured by the respective steps shown in FIG. The magnetic pole core piece 17 is laminated on the magnetic pole core piece 17, and the blank die is further rotated by .alpha.
7 is transposed and polymerized, whereby a laminated magnetic pole core portion 24 which is wholly integrated is manufactured. It should be noted that a main magnetic pole portion 25 having a gap between magnetic poles is formed by the magnetic pole core pieces 17 that have been transposed and polymerized, and connecting magnetic pole core portions 26, 27 are formed by the upper and lower two-layer magnetic pole core group pieces 16. The magnetic pole core group pieces 16 and the magnetic pole core pieces 17 are firmly connected and coupled by a caulking projection (not shown) formed in the center of the magnetic pole. Therefore, even if the strip 15 has a deviation in plate thickness, the whole is transposed and polymerized, so that the variations in plate thickness are equalized.

On the other hand, the strip 15 in which the magnetic pole iron core group piece 16 and the magnetic pole iron core piece 17 are punched out is formed by the step E in FIG.
After the F step, punching is performed by the punch 28 to form the yoke core piece 23a. The yoke core pieces 23a are sequentially laminated or transposed to form a laminated yoke core portion 29 as shown in FIG. Mounting grooves 30 are formed in the laminated yoke iron core portion 29 so as to correspond to the number of the magnetic poles. The mounting grooves 30 are, for example, medium expanding dovetail grooves as shown in FIG. The outer side portions of the laminated magnetic pole core portion 24 shown in A) can be press-fitted in the axial direction. FIG. 4 (C) shows a laminated iron core 23 for a stator of an electric motor, which is assembled as shown in FIG. 4 (A).
The windings inserted in this state are not shown. Although the number of magnetic poles is 12 and the number of divided groups is 4 in the above-described embodiment, the present invention is not limited to the number of magnetic poles, and is not limited by the number of divided groups.

[0013]

As is apparent from the above description, the laminated iron core for a stator of an electric motor and the manufacturing method thereof according to the first and second aspects of the present invention are as follows. Although it is divided, it is connected by the upper and lower connecting magnetic pole iron cores and is integrated, so a coil can be mounted on the iron core without requiring a special jig, and the equipment can be simplified. At the same time, work efficiency can be improved. Further, since the magnetic pole core group pieces that form the connecting magnetic pole core section and the magnetic pole core pieces that form the main magnetic pole section are transposition-polymerized in the mold, even if the strips have deviations in plate thickness, they can be assembled. Since the deviations of the laminated magnetic pole cores are equalized and there is no deviation in thickness, and the stacked iron cores do not tilt, press-fitting into the laminated yoke cores can be performed without any problems, and a stator of a high-quality motor Can manufacture laminated cores for automobiles. Furthermore, when forming the gaps between all the magnetic pole core pieces, the regions corresponding to the gaps are punched out in advance intermittently, so that the pressing process is reduced and the equipment cost is reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a manufacturing process of a laminated core for a stator of an electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a partially omitted plan view of a laminated magnetic pole core portion in an assembled state.

FIG. 4 is a perspective view showing a manufacturing process of a laminated core for a stator of the electric motor.

FIG. 5 is a perspective view of a stator core of an electric motor according to a conventional example.

[Explanation of symbols]

15 strips 16 Magnetic pole core group pieces 17 Magnetic pole piece 18 Connection 19 punch 20 punches 21 Gap 22 punch 22a dividing line 23 Laminated iron core for stator of electric motor 23a yoke core piece 24 Laminated magnetic pole core 25 Main magnetic pole 26 Connection magnetic pole core 27 Connection magnetic pole core 28 punches 29 Laminated yoke core 30 mounting groove

Claims (2)

[Claims] 1. A plurality of magnetic pole core pieces radially and equally arranged along the inner circumference of a stator core, and a yoke core piece having a mounting groove inside corresponding to the magnetic pole core pieces. A laminated core for a stator of an electric motor, comprising a laminated yoke core portion and a laminated magnetic pole core portion, which are divided and formed by sequentially laminating and superposing using caulking protrusions arranged on one side, said laminated magnetic pole core The part is formed by successively transposing and superposing a large number of magnetic pole core pieces divided for each magnetic pole, and the main magnetic pole parts are arranged in a radial pattern so as to form a gap between the magnetic poles, and the main magnetic pole parts are formed above and below the main magnetic pole part. The plurality of magnetic poles, which are fixed to each other, are divided into two or more groups, and a magnetic pole core group piece having a connecting portion is formed so as to close a gap between the magnetic poles belonging to each group, and the magnetic pole core group pieces are mutually connected. It is characterized in that it is composed of a coupled magnetic pole iron core part which is transposed and laminated in the circumferential direction. Laminated iron core for electric motor stators. 2. A yoke core piece having a large number of magnetic pole core pieces radially arranged uniformly along the inner circumference of a stator core and a groove for mounting the magnetic pole core pieces, which are punched to form each core piece. In the method for manufacturing a laminated iron core for a stator of an electric motor, which comprises sequentially laminating and polymerizing in a mold using a caulking protrusion arranged in, a laminated magnetic pole core portion and a laminated yoke iron core portion being divided and laminated, When forming the gaps between all of the multiple magnetic pole core pieces, a step of intermittently punching out a region corresponding to the gaps, and other than removing at least two gaps between the multiple magnetic pole core pieces A step of punching out an air gap so as to leave a connecting portion that closes the gap between the magnetic pole core pieces to form a magnetic pole core group piece, and at least two of the magnetic pole core group pieces are sequentially transposed and polymerized in the mold. Forming a connecting magnetic pole core, A main magnetic pole portion obtained by sequentially transposing and superposing the divided magnetic pole core pieces on the magnetic pole core portion is punched to form at least two magnetic pole core group pieces having the same shape as the magnetic pole core group piece. A step of forming a laminated magnetic pole core portion by stamping and forming the transposed and stacked coupled magnetic pole core portions, and a method of manufacturing a laminated core for a stator of an electric motor.