JPWO2013051125A1 - Manufacturing method of laminated iron core and laminated iron core produced thereby - Google Patents

Abstract

  The method of manufacturing a laminated core according to the present invention includes a plurality of divided core pieces, each of which includes a back yoke portion and a magnetic pole teeth portion protruding from the back yoke portion, arranged in a straight line, punched, and laminated by caulking. A method of manufacturing a laminated iron core comprising: a first step of punching out a first portion located on the side of a demagnetizing teeth portion between adjacent end portions of a back yoke portion of the core piece; and a back yoke portion of the core piece A second step of punching out a second portion located on the side of the magnetic pole teeth portion between adjacent end portions, the first portion punched out by the first step, and the second portion punched out by the second step It includes a third step of punching out the communicating portion and a fourth step of punching out so as to form the magnetic pole tooth portion.

Description

  The present invention relates to a method for manufacturing a laminated core of a rotating electrical machine, and more particularly, to an improvement in the characteristics of a laminated core in addition to improvement in productivity and material yield in a laminated core in which core pieces are connected.

  The conventional laminated iron core includes a back yoke portion, a magnetic teeth portion protruding from the back yoke portion, an arc-shaped convex portion provided at one end of the back yoke portion, a back yoke portion end, and the like. A core piece having an arcuate concave portion provided at an end and a rotating shaft provided in an arcuate convex portion is formed by connecting an arcuate convex portion and an arcuate concave shape of adjacent core pieces. The first core member, which is sequentially arranged so that the portions are in contact with each other, and the arc-shaped convex portion and the arc-shaped concave portion are fitted so that the arrangement direction of the core pieces is different from that of the first core member. Japanese Patent Application Laid-Open No. 2000/1990 discloses a structure in which second core members sequentially arranged in contact with each other are alternately stacked and connected, and stacked cores in which core pieces are stacked are connected to each other so as to be rotatable around a rotation shaft portion. -1116074.

  The fitting contact portion between the arc-shaped convex portion and the arc-shaped concave portion of the adjacent core piece is formed by punching and cutting in a mold as disclosed in JP-A-2002-171725. Is formed.

JP 2000-116074 A JP 2002-171725 A

  In the above-described conventional laminated core, since the fitting contact portion of the adjacent core piece is formed by cutting and bending, distortion occurs in the portion corresponding to the bending fulcrum of the cutting and bending, so that There have been problems such as reduced efficiency of the rotating electrical machine and increased torque pulsation due to deterioration in shape accuracy and partial magnetostriction of the laminated core.

  Further, FIG. 1 of Patent Document 1 discloses a method of improving the material yield of the laminated core by arranging and pressing the core pieces in a straight line, but the process A or the process of Patent Document 1 is disclosed. It is difficult to accurately produce a punch that integrally punches the gap forming the back yoke portion end of the adjacent core piece, such as B, and the inner and outer peripheral portions of the back yoke portion in the vicinity thereof. Since the gap and the portion where the inner and outer peripheral portions are punched are connected in a discontinuous manner, stress concentration occurs in the connecting portion, the durability of the punch is lowered, and the die is difficult to mass-produce the laminated core.

  The present invention has been made to solve the above-described problems, and its object is to provide a press processing method that is excellent in mass productivity and has a high material yield, and reduces the processing distortion of the core piece. It is an object of the present invention to provide a method for manufacturing a laminated core capable of improving characteristics such as efficiency and torque pulsation.

  The method of manufacturing a laminated core according to the present invention includes a plurality of divided core pieces, each of which includes a back yoke portion and a magnetic pole teeth portion protruding from the back yoke portion, arranged in a straight line, punched, and laminated by caulking. A method of manufacturing a laminated iron core comprising: a first step of punching out a first portion located on the side of a demagnetizing teeth portion between adjacent end portions of a back yoke portion of the core piece; and a back yoke portion of the core piece A second step of punching out a second portion located on the side of the magnetic pole teeth portion between adjacent end portions, the first portion punched out by the first step, and the second portion punched out by the second step It includes a third step of punching out the communicating portion and a fourth step of punching out so as to form the magnetic pole tooth portion.

  According to the method for manufacturing a laminated core according to the present invention, a portion that communicates the first portion punched out in the first step and the second portion punched out in the second step is punched out in a third step. Therefore, the press work can be performed without using the cutting method in the state where the core pieces are arranged in a straight line, so that the processing distortion can be reduced and the characteristics such as efficiency and torque pulsation can be improved.

  Further, a step of punching adjacent end portions of the back yoke portion includes a first step of punching a first portion located on the side opposite to the magnetic pole teeth portion between the adjacent end portions of the back yoke portion of the core piece, and the core piece. A second step of punching out a second portion located on the magnetic pole teeth portion side between adjacent end portions of the back yoke portion, the first portion punched out by the first step, and the second portion punched out by the second step. Since the second part is divided into the third step of punching out the part communicating with the two parts, the manufacture of the punch is facilitated, the durability of the punch is improved, and the mass productivity can be improved.

  Furthermore, since the press work can be performed in a state where the core pieces are linearly arranged on the metal sheet, the material yield can be improved.

It is a top view which shows the rotary electric machine concerning Embodiment 1 of this invention. It is a top view which shows the laminated iron core concerning Embodiment 1 of this invention. It is a perspective view which shows the laminated iron core concerning Embodiment 1 of this invention. It is the elements on larger scale of FIG. 2 concerning Embodiment 1 of this invention. It is a top view which shows the state after the press work of the laminated iron core concerning Embodiment 1 of this invention. It is the elements on larger scale of FIG. 5 concerning Embodiment 1 of this invention. It is the elements on larger scale of FIG. 6 concerning Embodiment 1 of this invention. It is a top view which shows the press work process drawing of the laminated iron core concerning Embodiment 1 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 7. In each figure, the same or equivalent members and parts will be described with the same reference numerals. 1 is a plan view showing a rotary electric machine according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing the laminated iron core according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing the laminated iron core according to Embodiment 1 of the present invention. 4 is a partially enlarged view of FIG. 2 according to Embodiment 1 of the present invention. FIG. 5 is a plan view showing a state after press working of the laminated iron core according to Embodiment 1 of the present invention. 6 is a partially enlarged view of FIG. 5 according to Embodiment 1 of the present invention. FIG. 7 is a partially enlarged view of FIG. 6 according to the first embodiment of the present invention. FIG. 8 is a plan view showing a pressing process diagram of the laminated core according to the first embodiment of the present invention.

  In each of these drawings, reference numeral 1 denotes a rotating electric machine, a stator 2 in which a drive coil 5 is wound around a laminated core 3 via an insulator 4, and a rotor 6 that is disposed on the inner peripheral side of the stator 2 and has a permanent magnet 7. And a housing 8 for holding the stator 2 and the rotor 6.

  The laminated iron core 3 is composed of, for example, nine core blocks 12 as shown in FIG. As shown in FIG. 4, the core block 12 includes a back yoke portion 13 that forms an annular yoke portion of the laminated core 3, and a magnetic pole on which the drive coil 5 that protrudes from the back yoke portion 13 to the inner peripheral side is wound. The teeth 14, the rotating shaft 15 provided at one end of the end of the back yoke 13 connecting the adjacent core blocks 12, and the outer circumferential notch 19, the adjacent core blocks 12 are mutually connected. The rotary shaft portion 15 is connected so as to be rotatable.

  As shown in FIG. 6, the laminated iron core 3 is manufactured by pressing a magnetic steel sheet in a state where the magnetic pole teeth portions 14 are linearly expanded so as to be substantially parallel to each other, as shown in FIG. Further, a core piece having a substantially convex portion 17 at one end of the back yoke portion 13, a substantially concave portion 18 at the other end, a substantially convex portion 17, and an outer peripheral notch portion 19 provided on the outer peripheral side of the substantially concave portion 18. As shown in FIG. 5 (A) and FIG. 5 (B), the first core members 20 are arranged in sequence so that the substantially convex portions 17 and the substantially concave portions 18 face each other at a predetermined pitch, The core member 20 is a second member in which the substantially convex portion 17 and the substantially concave portion 18 are sequentially arranged so as to face each other at a predetermined pitch so that the directions of the substantially convex portion 17 and the substantially concave portion 18 are opposite to each other. For example, as shown in FIG. 3, the core member 21 is laminated every three layers and fixed by a caulking 22. It has been determined.

  The rotating shaft portion 15 is provided on the substantially convex portion 17 of the core piece 16. Here, the outer circumferential notch 19 has a symmetrical shape with respect to a straight line passing through the rotating shaft 15 and parallel to the magnetic pole teeth 14, and is magnetic between the first core member 20 and the second core member 21. Torque pulsation can be reduced to achieve a balanced balance, and in the pressing process of the laminated core to be described later, one type of punch for forming the outer peripheral side notch portion 19 can be made. Miniaturization can be achieved.

  As shown in FIGS. 2 and 4, the core piece 16 is rotated about the rotating shaft portion 15 so that the substantially convex portion 17 and the substantially concave portion 18 abut each other when the laminated core 3 is closed in an arc shape. It is configured. Here, since the axis P1 of the rotating shaft portion 15 is provided so as to be positioned on the outer peripheral side with respect to the center P2 of the arc portion of the substantially convex portion 17 as shown in FIG. As shown in the figure, in a state where the laminated iron core 3 is linearly developed so that the magnetic pole teeth portions 14 are substantially parallel to each other, an outer peripheral side cutout portion is provided between the substantially convex portion 17 and the substantially concave portion 18 of the adjacent core piece 16. A gap 23 between the core pieces connected from 19 to the inner peripheral side is formed.

  Further, when the core piece 16 is closed to form the annular laminated core 3 as shown by a two-dot chain line in FIG. 7, the substantially concave portion 18 and the substantially convex portion 17 are attached to each other so that the magnetic resistance of the back yoke portion 13 is reduced. It can be made small, and the loss of efficiency of the rotating electrical machine 1 can be suppressed.

  Then, the press work process which manufactures the laminated iron core 3 is demonstrated using (A)-(H) of FIG. First, in the step (A), a pilot hole 30 for positioning with a mold is punched out from a belt-shaped electromagnetic steel sheet set in a press. Subsequently, the electromagnetic steel sheet moves in the material feeding direction at an equal pitch, and the processing in each process is continuously performed.

  The step (B) is a first step of punching out a first portion located on the side opposite to the magnetic pole teeth between the adjacent end portions of the back yoke portion 13 of the core piece 16, and the outer peripheral side cutout portion which is the first portion. The slit 31 for forming 19 is punched out.

  Step (C) is a second step of punching out a second portion located on the side of the magnetic pole teeth between the adjacent ends of the back yoke portion 13 of the core piece 16, and the figure shows the magnetic pole teeth 14 as an example. The fourth step of punching out is operated integrally to punch out the slit 32 forming the second portion and the magnetic pole teeth 14.

  Steps (D) and (E) are a third step of punching out a portion that connects the first portion punched out in the first step and the second portion punched out in the second step, and the back yoke portion 13 of the core piece 16 is punched out. The slits 33 and 34 which are the gaps 23 between the core pieces for forming the substantially convex part 17 and the substantially concave part 18 at the end of the core are punched.

  The punches for punching the slits 33 and 34 are synchronized with the operation of the press to form the two types of the first core member 20 and the second core member 21 shown in FIGS. 5 (A) and 5 (B). Thus, the slits 33 and 34 are not punched in duplicate. For example, the slit 33 and the slit 34 are automatically switched and punched every predetermined number of laminated cores 3, for example, every three.

  Here, since the slits 31, 32, 33, and 34 are punched with independent punches, it is easy to manufacture each punch, and the slits 33 and 34 are punched after the slits 31 and 32 are punched in advance. It is possible to reduce a load applied to the punches of the slits 33 and 34 having a relatively small punch rigidity.

  In order to further improve the durability of the punches of the slits 33 and 34, it is possible to set the punch width of the slits 33 and 34 corresponding to the gap 23 between the core pieces to be equal to or greater than the plate thickness of the core piece 16 (electromagnetic steel plate). preferable.

  Here, as described above, the slit 31 forming the outer circumferential notch 19 is symmetrical with respect to a straight line passing through the rotary shaft 15 and parallel to the magnetic pole teeth 14, that is, symmetrical with respect to the slits 33 and 34. Therefore, the outer peripheral cutout 19 can be formed with one type of punch and can be integrated into the step (B), so that the mold can be simplified and miniaturized.

  Subsequently, in the step (F), the slit 35 into which the removal caulking 22 is fitted and the hole 36 into which the rotation shaft portion 15 is fitted are punched, and in the step (G), the dowels of the removal caulking 22 and the rotation shaft portion 15 are formed. . These steps (F) and (G) are selectively switched and formed. For example, in the step (F), a predetermined number of laminated cores 3, for example, every three, the slit 35 and the hole 36 are automatically switched and punched. The slits 35 are laminated so that the caulking 22 is fitted and the rotary shaft portion 15 is fitted in the hole 36.

  Further, since the first core member 20 and the second core member 21 are magnetically balanced, torque pulsation can be reduced. Finally, in step (H), the outer periphery of the core piece 16 is punched out, and the core piece 16 is continuously laminated inside the mold. By becoming effective when reaching the number of sheets, it is possible to prevent the plurality of laminated cores 3 from being connected by punching.

  In addition, although the process (F) and the process (G) described the case where the first core member 20 for which the process (D) was selected was described, the process (E) was selected but not illustrated. After performing the process (F) and the process (G), the outer periphery of the core piece 16 is punched out in the process (H), and the core piece 16 is continuously laminated inside the mold.

  In the laminated iron core of the rotating electrical machine according to the embodiment of the present invention, when the substantially convex portion 17 and the substantially concave portion 18 are formed at the end of the back yoke portion 13 of the adjacent core piece 16, the back yoke portion 13 is adjacent. A first step of punching a first portion located on the side of the anti-magnetic teeth portion between the end portions, a second step of punching a second portion located on the side of the magnetic pole teeth portion between the adjacent ends of the back yoke portion 13, and Since the first portion punched out in the first step and the second portion punched out in the second step are divided into the third step of punching out, the punch can be easily manufactured and the durability of the punch is improved. It is possible to improve the mass productivity of press working in a state where the core pieces 16 are linearly arranged.

  In addition, the laminated iron core manufactured in the first embodiment can suppress processing strain, improve characteristics such as efficiency and torque pulsation, and improve material yield. Furthermore, the influence of the magnetic anisotropy of the electromagnetic steel sheet can be reduced and torque pulsation can be reduced as compared with the case of pressing in an arcuate or annular state.

  Also, the second step of punching out the second portion located on the side of the magnetic pole teeth between the adjacent ends of the back yoke portion 13 of the core piece 16 and the fourth step of punching out to form the magnetic pole teeth 14 are integrated. However, the present invention is not limited to this, and the second step of punching the second portion and the punching step of forming the magnetic teeth 14 may be separated and punched. Of course. Further, the punching step for forming the magnetic teeth 14 and the step (H) for punching the outer periphery of the core 16 piece may be integrally punched, and the number of steps can be reduced to reduce the size of the mold. .

  By the way, in embodiment mentioned above, between the 1st process which punches out the 1st site | part located in the antimagnetic teeth part side between the adjacent edge parts of the back yoke part 13, and the adjacent edge part of the back yoke part 13 When the second step of punching out the second part located on the side of the magnetic teeth portion and the third step of punching out the part connecting the first part punched out by the first step and the second part punched out by the second step are performed. As described above, it is common to the first step of punching out the first portion and the third step of punching out the portion connecting the first portion and the second portion. As compared with the above, the punch can be easily manufactured, the durability of the punch is improved, and the mass productivity of the press work in a state where the core pieces 16 are arranged in a straight line can be improved.

  In the above-described embodiment, the first step of punching out the first portion located on the side of the anti-magnetic teeth portion between the adjacent end portions of the back yoke portion 13 and the adjacent end portions of the back yoke portion 13 are performed. When the second step of punching out the second part located on the side of the magnetic teeth portion and the third step of punching out the part connecting the first part punched out by the first step and the second part punched out by the second step are performed. As described above, the second step of punching out the second part and the third step of punching out the part communicating with the first part and the second part are common, that is, the conventional process described above may be performed. As compared with the above, the punch can be easily manufactured, the durability of the punch is improved, and the mass productivity of the press work in a state where the core pieces 16 are arranged in a straight line can be improved.

  In the embodiment described above, the outer peripheral cutout 19 is formed in the step (B). However, the step is performed by integrally punching the outer periphery of the core 16 pieces into the step (H). It is also possible to reduce the number of molds by reducing the number.

  Moreover, in the said embodiment, although it is a method of manufacturing the laminated iron core with which the adjacent core block 12 was connected by the rotating shaft part 15, the process of this rotating shaft part 15 is abbreviate | omitted and each core block 12 is divided | segmented. It is applicable also to the manufacturing method of the laminated core which is. In this case, the material yield of the split laminated core can be improved, and the productivity can be improved.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  The present invention is suitable for realizing a method for manufacturing a laminated iron core that can reduce processing distortion of the core piece and improve characteristics such as efficiency and torque pulsation.

The method of manufacturing a laminated core according to the present invention includes a plurality of divided core pieces, each of which includes a back yoke portion and a magnetic pole teeth portion protruding from the back yoke portion, arranged in a straight line, punched, and laminated by caulking. A method of manufacturing a laminated iron core comprising: a first step of punching out a first portion located on the side of a demagnetizing teeth portion between adjacent end portions of a back yoke portion of the core piece; and a back yoke portion of the core piece A second step of punching a second portion located between the adjacent ends of the magnetic teeth portion, the first portion punched by the first step after the first step and the second step, and the This includes a third step of punching out a portion communicating with the second portion punched out in the second step, and a fourth step of punching out so as to form the magnetic pole tooth portion.

Claims (13)

  A method of manufacturing a laminated core comprising a back yoke part and a plurality of divided core pieces formed by magnetic pole teeth projecting from the back yoke part arranged in a straight line, punched and laminated, A first step of punching out a first portion located on the side of the demagnetizing teeth portion between adjacent ends of the back yoke portion of the core piece; and the magnetic pole teeth portion between adjacent ends of the back yoke portion of the core piece. A second step of punching a second portion located on the side, a third step of punching a portion communicating the first portion punched by the first step and the second portion punched by the second step, And a fourth step of punching so as to form a magnetic tooth portion.   The adjacent end portions of the back yoke portions of the plurality of core pieces are provided with a substantially convex portion on one end side, a substantially concave portion on the other end side, and a substantially convex portion on one end side of the core piece. The method for manufacturing a laminated core according to claim 1, wherein the core portion and the substantially concave portion on the other end side of the core piece are abutted with each other.   A first core member formed by sequentially arranging a core piece having a back yoke portion having a substantially convex portion on one end side and a substantially concave portion on the other end side; and the core piece of the first core member A back yoke portion having a substantially concave portion at a position corresponding to the position of the substantially convex portion and a substantially convex portion at a position corresponding to the position of the substantially concave portion of the core piece of the first core member. The method for manufacturing a laminated core according to claim 2, wherein the second core members formed by sequentially arranging the core pieces are laminated alternately.   The method for producing a laminated core according to claim 2 or 3, wherein a connecting means for connecting adjacent edges in the stacking direction of the cores is provided on the substantially convex portion.   The shape of the first part punched out in the first step is symmetric with respect to a straight line passing through the rotation center of the connecting means in parallel with the protruding direction of the magnetic pole teeth. Item 5. The method for producing a laminated core according to any one of Items4.   The punching width of the part that communicates the first part and the second part is a punching width that is equal to or greater than the plate thickness of the core piece. The manufacturing method of the laminated iron core as described in a term.   2. The method for manufacturing a laminated core according to claim 1, wherein the first step of punching out the first portion is common with the third step of punching out a portion communicating the first portion and the second portion. .   2. The method of manufacturing a laminated core according to claim 1, wherein the second step of punching out the second part is common to a punch that punches out a part communicating the first part and the second part.   2. The method of manufacturing a laminated core according to claim 1, wherein the second step of punching out the second portion is common to the fourth step of punching out so as to form a magnetic tooth portion.   The method for manufacturing a laminated core according to claim 1, wherein the first step of punching out the first portion is common with the step of punching out and laminating the core pieces.   The back yoke portion has a shape in which a step does not occur on the outer peripheral side where the end portions of the back yoke portion contact each other in a state where a plurality of the core pieces are arranged in an annular shape or an arc shape in order. Item 3. A method for producing a laminated iron core according to Item 2.   5. The method for manufacturing a laminated core according to claim 4, wherein the rotation center of the connecting means is provided so as to be positioned on the outer peripheral side from the rotation center of the substantially convex portion.   A laminated core manufactured by the manufacturing method according to any one of claims 1 to 12.

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