JP6045638B2 - Manufacturing method of laminated iron core - Google Patents

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.

In the manufacturing method of the laminated core according to the present invention, the adjacent end portions of the back yoke portions of the plurality of divided core pieces constituted by the back yoke portion and the magnetic pole teeth portion protruding from the back yoke portion are on one end side. A substantially convex portion having an arc is provided on the other end portion, and a substantially concave portion having an arc is provided on the other end side. The substantially convex portion on one end side of the core piece and the other end side of the core piece are provided. core of the substantially concave portion is formed so as mate-out butt across the core pieces gap, with a back yoke portion having the substantially concave portion to the substantially convex portion and the other end side to one end side The first core member is formed by sequentially arranging pieces, and the first core member is formed as a substantially concave portion at a position corresponding to the position of the substantially convex portion of the core piece of the first core member. A back yoke portion having a substantially convex portion at a position corresponding to the position of the substantially concave portion of the core piece. Forming a second core member made of the core pieces are sequentially arranged, and the first core member and the second core member is a method of manufacturing a laminated core formed by caulking laminated vent alternately And a pressing step in which the plurality of core pieces are linearly arranged and punched out, and a laminating step in which the plurality of core pieces are stacked, and the pressing step forms a rotating shaft portion at the position of the substantially convex portion. The step of punching out the gap between the core pieces, the step of punching out the outer peripheral notch adjacent to the gap between the core pieces, and the step of forming the magnetic pole teeth, and the outer peripheral notch Has a symmetrical shape with respect to a straight line passing through the rotating shaft portion and parallel to the magnetic pole teeth portion, and a punching width between the core piece gaps is equal to or greater than a plate thickness of the core piece.

  According to the method for manufacturing a laminated core according to the present invention, the punching width between adjacent end portions of the core piece is equal to or greater than the plate thickness of the core piece, so that the punch can be easily manufactured. As a result, the processing strain is reduced and 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 out.

  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.

Claims (2)

Adjacent ends of the back yoke portions of a plurality of divided core pieces composed of a back yoke portion and a magnetic pole tooth portion protruding from the back yoke portion are provided with a substantially convex portion having an arc on one end side. A substantially concave portion having an arc on the other end side, and the substantially convex portion on one end side of the core piece and the substantially concave portion on the other end side of the core piece provide a gap between the core pieces. sandwiched therebetween are formed so as to mate-out collision, first core formed by sequentially arranging the core pieces having a back yoke portion having the substantially concave portion to the substantially convex portion and the other end side to one end side Forming a member , forming a substantially concave portion at a position corresponding to the position of the substantially convex portion of the core piece of the first core member, and the position of the substantially concave portion of the core piece of the first core member the second core portion formed by sequentially arranging the core pieces having a back yoke part and generally convex portion in a position corresponding to the Forming a said a first core member and the second core member is a method of manufacturing a laminated core formed by caulking laminated punching alternately,
A pressing step of arranging and punching the plurality of core pieces in a straight line; and a lamination step of stacking the plurality of core pieces,
The pressing step includes a step of forming a rotary shaft portion at the position of the substantially convex portion, a step of punching out the gap between the core pieces, and a step of punching out an outer peripheral side notch portion between the core piece gaps, Forming the magnetic pole teeth portion,
The outer peripheral notch has a symmetrical shape with respect to a straight line passing through the rotating shaft and parallel to the magnetic teeth portion, and a punching width between the core piece gaps is equal to or greater than a plate thickness of the core piece. The manufacturing method of the laminated iron core characterized by the above-mentioned. Is the rotating shaft portion you connecting edge portions comprising Neighboring the stacking direction before Symbol plurality of core pieces arranged in the substantially convex portion, the rotation center of the pre-Symbol rotation shaft portion of the substantially convex portion The method for manufacturing a laminated core according to claim 1, wherein the method is provided so as to be positioned on an outer peripheral side from a rotation center.

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