JP5162786B2 - Manufacturing method of laminated core and strip-shaped core - Google Patents

Description

    The present invention relates to a method for manufacturing a laminated core and a strip-shaped core piece, and more specifically, a plurality of segment core pieces having a substantially fan shape are connected to a shape extending linearly via a connecting portion provided on the outer peripheral side. The present invention relates to a method of manufacturing a laminated core by laminating the formed strip-shaped core pieces while being spirally wound, and a strip-shaped core piece employed in the manufacturing method.

    For example, a laminated stator core of a drive motor is usually manufactured by stamping and forming a stator core piece from a metal plate using a press mold device, and laminating a predetermined number of the stator core pieces and caulking together. Is done.

  According to such a method of manufacturing a laminated stator core, a laminated stator core with good shape accuracy can be produced, but the individual stator core pieces constituting the laminated stator core have a circular outer shape. In addition, since there is an opening for accommodating the rotor in the center, there are many parts that become scrap when punching and the material yield of the iron core plate is lowered.

  Here, as an example of a technique for eliminating the reduction in the material yield as described above, there is provided a method of manufacturing a laminated stator core by spirally winding and laminating strip-like core pieces formed by punching from a metal plate. (For example, refer to Patent Document 1).

  FIG. 9 is an example of a laminated stator core manufactured by the above-described method, and this laminated stator core A includes salient poles St, St... Projecting radially inward from a ring-shaped yoke. And a strip-shaped core piece W formed by connecting a plurality of segment core pieces S, S... Having a substantially fan shape to a shape extending linearly via connecting portions J provided on the outer peripheral side. The strip-shaped core pieces W are laminated while being spirally wound, and the wound strip-shaped core pieces W, W,.

In addition, as a typical process for manufacturing the laminated stator core A, as shown in FIG. 10, after forming the strip-shaped core piece W continuously from the strip-shaped steel plate in the press device P, the strip-shaped core piece W Is fed to the winding laminating apparatus M, and the laminated strip core pieces W are caulked and joined to each other while being wound around the mandrill Mm of the winding laminating apparatus M, thereby producing an integrated laminated stator core A.
JP-A-9-308143

    By the way, although the strip | belt-shaped iron core piece W for manufacturing the said laminated stator core A is exhibiting the shape which connected several segment core piece S, S ... by the connection part J in a part of outer peripheral side, The part J is formed as thin as possible within an allowable range so that the strip-shaped core piece W can be easily bent in the winding and laminating process in the winding and laminating apparatus M.

  For this reason, when it is wound around the mandrill Mm of the winding laminating apparatus M, when it is conveyed with a tensile force acting on the strip-shaped iron core piece W, or in a dangling manner between the press apparatus P and the winding laminating apparatus M as shown in FIG. Due to the tensile force acting by the weight of the strip-shaped iron core piece W itself, a large burden is applied to the thin connecting portion J that connects the segment core pieces S to each other.

  As described above, since a large burden is applied to the connecting portion J, the strip-shaped core piece W is often deformed or cut, and when the strip-shaped core piece W is deformed, the completed stator core piece A There is an inconvenience that the quality is lowered, and there is an inconvenience that the productivity of the stator core piece A is greatly hindered by the cutting of the strip-shaped core piece W.

  An object of the present invention is to provide a laminated iron core having excellent quality in view of the above-described actual conditions, and capable of producing an improved workability and cost reduction. It is in providing the manufacturing method of an iron core, and a strip-shaped iron core piece.

In order to achieve the above object, the method for manufacturing a laminated iron core according to the invention of claim 1 has a shape that extends linearly through a connecting portion provided on the outer peripheral side with a plurality of segment core pieces having a substantially fan shape. A method of manufacturing a laminated iron core by laminating a strip-shaped iron core piece formed by joining together while being spirally wound,
On the inner peripheral side between adjacent segment core pieces, using a strip-shaped iron core piece formed with an auxiliary connecting part via an easy-cut part,
Immediately before the step of spirally winding the strip-shaped core piece, the step of removing the auxiliary connecting portion from the strip-shaped core piece at the easy-cut portion is characterized.

  The method for manufacturing a laminated core according to the invention of claim 2 is the method of manufacturing a laminated core according to claim 1, wherein the easy-to-cut portion of the strip-shaped core piece is formed in a portion that enters the segment core piece. It is characterized by.

The strip-shaped iron core piece according to the invention of claim 3 is formed by connecting a plurality of segment core pieces having a substantially fan shape to a shape extending linearly via a connecting portion provided on the outer peripheral side, and wound in a spiral shape. It is a strip-shaped core piece that forms a laminated core by being laminated while rotating,
An auxiliary connecting portion is formed on the inner peripheral side between adjacent segment core pieces via an easily cut portion.

  The strip-shaped core piece relating to the invention of claim 4 is characterized in that, in the strip-like core piece relating to the invention of claim 3, the easy-cut portion is formed at a portion entering the inside of the segment core piece.

    According to the manufacturing method of the laminated core related to the invention of claim 1, by using a strip-shaped core piece in which an auxiliary connecting portion is formed via an easily cut portion on the inner peripheral side between adjacent segment core pieces, Since the segment core pieces of the above-mentioned strip-shaped core pieces are also connected by the auxiliary joint portion together with the connecting portion, even if a large tensile force acts in the manufacturing process, it is possible to prevent the strip-shaped core piece from being deformed or cut. Therefore, it is possible to manufacture a laminated iron core having excellent quality with good productivity.

  Moreover, according to the manufacturing method of the laminated core related to the invention of claim 1, immediately before the step of spirally winding the strip-shaped core piece, by removing the auxiliary connecting portion from the strip-shaped core piece at the easily cut portion, In the same manner as using the conventional strip-shaped core pieces in which the segment core pieces are connected only by the connecting portion, it is possible to manufacture a laminated core by spirally winding the strip-shaped core pieces without any trouble.

  According to the method for manufacturing a laminated core according to the invention of claim 2, the easy-cut portion of the strip-shaped core piece is formed at a portion that has entered the inside of the segment core piece, so that the easy-cut portion can be supplemented from the strip-shaped core piece. By cutting off the connecting portion, when the strip-shaped core pieces are wound, the meeting edge portions of the segment core pieces do not interfere with each other, so that it is possible to manufacture a laminated core having excellent shape accuracy.

  According to the strip-shaped core piece relating to the invention of claim 3, the segment core of the strip-shaped core piece is formed by forming the auxiliary connecting portion via the easy-cut portion on the inner peripheral side between the adjacent segment core pieces. Since the pieces are connected by the auxiliary connecting portion together with the connecting portion, even when a large tensile force is applied in the manufacturing process, deformation and cutting of the strip-shaped iron core pieces are suppressed, and the quality is excellent. It becomes possible to manufacture a laminated iron core with good productivity.

  According to the strip-shaped core piece relating to the invention of claim 4, by forming the easy-cut portion in the portion that has entered the inside of the segment core piece, by cutting the auxiliary connecting portion from the strip-shaped core piece in the easy-cut portion When the strip-shaped core pieces are wound, the meeting edge portions of the segment core pieces do not interfere with each other, and it is possible to manufacture a laminated core having excellent shape accuracy.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an example of a laminated core manufactured in accordance with the present invention. This laminated stator core (laminated core) 1 has salient poles 11t and 11t protruding radially inward from a ring-shaped yoke. As shown in FIG. 2, a plurality of segment core pieces 11, 11... Having a substantially fan shape are connected to the connecting portions 12, 12. Using the strip-shaped core pieces 10 connected in a linearly extending shape along the axis XX through the portions 13, 13 ..., the strip-shaped core pieces 10 are laminated while being spirally wound, It is manufactured by caulking and fixing the wound strip-shaped core pieces 10, 10.

  As shown in FIGS. 2 and 3, the strip-shaped core piece 10 has a plurality of segment core pieces 11, 11..., And each segment core piece 11 is an abbreviation that constitutes the yoke of the laminated stator core 1 described above. It has a fan-shaped divided yoke portion 11y and salient poles 11t, 11t... Projecting from the inner peripheral side of the divided yoke portion 11y.

  Adjacent segment core pieces 11 are connected to each other via a connecting portion 12 provided on the outer peripheral side of the segment core piece 11, more specifically, on the outer peripheral side of the meeting edge portion 11e in the divided yoke portion 11y. Is formed as thin as possible within an allowable range so that the strip-shaped core piece 10 can be easily bent in the winding and laminating process in the winding and laminating apparatus M described later.

  Further, the adjacent segment core pieces 11 are connected to each other via an auxiliary connecting portion 13 provided on the inner peripheral side of the segment core piece 11, more specifically, on the inner peripheral side of the meeting edge portion 11e in the divided yoke portion 11y. In the connecting portion between the auxiliary connecting portion 13 having a rib shape and the divided yoke portion 11y, an easily cut portion 14 including a V notch 14v extending on an extension line of the meeting edge portion 11e is formed.

  In order to manufacture the laminated stator core 1 shown in FIG. 1 using the above-described strip-shaped iron core piece 10, as shown in FIGS. After the formation, the strip-shaped core piece 10 is conveyed to the winding and laminating apparatus M.

  Next, the strip-shaped core piece 10 fed into the winding laminating apparatus M is wound around the mandrill Mm and wound. Here, immediately before the step of winding the strip-shaped core piece 10 is installed in the winding laminating apparatus M. The step of removing the auxiliary connecting portion 13 of the strip-shaped core piece 10 from the strip-shaped core piece 10 by cutting the auxiliary connecting portion 13 of the strip-shaped core piece 10 at the left and right easy-to-cut sections 14 and 14 is essential.

  Thus, immediately before the step of winding the strip-shaped iron core piece 10, by removing the auxiliary connecting portion 13, the adjacent segment core pieces 11 are connected only by the connecting portion 12. The integrated laminated stator core 1 is manufactured by caulking and joining the strip-shaped core pieces 10 and 10 wound around the mandrill Mm of the winding laminating apparatus M and spirally wound and laminated. Become.

  According to the configuration described above, by using the strip-shaped core piece 10 in which the auxiliary connecting portion 13 is formed via the easily cut portion 14 on the inner peripheral side between the adjacent segment core pieces 11, the strip-shaped core piece 10. Since the segment core pieces 11 are connected to each other by the auxiliary connecting portion 13 together with the connecting portion 12, the strip-shaped core pieces 10 are transported in a manner of hanging between the press device P and the winding laminating device M. Even when a large tensile force due to its own weight is applied, deformation and cutting of the strip-shaped core piece 10 can be suppressed, and it is possible to manufacture the laminated core 1 having excellent quality with good productivity. Become.

  Further, since the connection between the segment core pieces 11 in the strip-shaped core piece 10 can be strengthened, it is possible to withstand higher speed conveyance, so that the conveyance speed between the press apparatus P and the winding laminating apparatus M is increased. In addition, it is possible to increase the speed of the winding and laminating process, and it is possible to achieve further improvement in productivity, and it is also possible to achieve reduction in production cost.

  Moreover, since the strength of the strip-shaped core piece 10 is improved, it can sufficiently withstand deformation due to an external force during handling, and the conventional handling of the strip-shaped core piece in a nervous manner is alleviated. Further improvements can be achieved.

  Furthermore, according to the above-described configuration, the segment core pieces 11 are connected to each other by removing the auxiliary connecting portion 13 from the strip-shaped core piece 10 at the easy-cut portion 14 immediately before the step of winding the strip-shaped core piece 10 in a spiral shape. It is possible to manufacture the laminated core 1 by spirally winding the strip-shaped core piece 10 without any trouble as in the case of using the conventional strip-shaped core piece that is connected only by the connecting portion 12. Needless to say.

  FIG. 6 shows another embodiment of the strip-shaped core piece used in the method for manufacturing a laminated core according to the present invention and the strip-shaped core piece according to the present invention.

  Adjacent segment core pieces 21 in the strip-shaped iron core piece 20 are connected to each other via a connecting portion 22 provided on the outer peripheral side of the segment core piece 21, more specifically on the outer peripheral side of the meeting edge portion 21e in the divided yoke portion 21y. In addition, they are connected to each other via an auxiliary connecting portion 23 provided on the inner peripheral side of the segment core piece 21, specifically, on the inner peripheral side of the meeting edge portion 21 e in the divided yoke portion 21 y.

  The connecting portion between the auxiliary connecting portion 23 and the segment core pieces 21, 21 faces the meeting edge portion 21 e of the split yoke portion 21 y and is easily formed by constriction by notches 24 a, 24 a formed in the auxiliary connecting portion 23. A cutting portion 24 is formed.

  The configuration of the strip-shaped core piece 20 described above is basically the same as that of the strip-shaped core piece 10 shown in FIGS. 2 and 3 except for the easy-to-cut portion 24 including the notches 24a and 24a. 6 that are the same as those of the elements are denoted by the same reference numerals as those of FIGS.

  In order to manufacture a laminated stator core using the above-described strip-shaped core piece 20, as shown in FIGS. 4 and 5, the strip-shaped core piece 20 formed in the press device is transported to the winding and laminating apparatus, and the strip-shaped core piece 20. Immediately before the step of winding the strips, the auxiliary connecting portions 23 are separated and removed in the easy-cut portions 24, 24, and then the strip-shaped core pieces 20, 20 that are spirally wound around the mandrill of the winding laminating apparatus and stacked. This is done by caulking together.

  According to the above-described configuration, it is possible to manufacture the laminated core 1 having excellent quality with good productivity in the same manner as the embodiment shown in FIGS. 1 to 5 and to increase the speed of the manufacturing process. Further improvement in productivity and reduction in production cost can be achieved, and further improvement in workability can be achieved because the strip-shaped core piece resists deformation during handling.

  Here, in the strip-shaped iron core piece 10 shown in FIG. 3, the easy-cut portion 14 is formed by the V notch 14 v so as to be easily broken when the auxiliary connecting portion 13 is removed, and the strip-shaped core piece 10 shown in FIG. 6. In the iron core piece 20, the easy cutting part 24 is formed by the notches 24 a and 24 a (bundled) so that the auxiliary connecting part 23 can be easily cut into pieces, but the auxiliary connecting part in the strip-shaped iron core piece is removed. As the means, a method of punching out the necessary shape of the auxiliary connecting portion with a die (punch / die) is optimal.

  In addition, the “V notch” and “neck” that make up the easy-to-cut part are suitable on the extended line of the segmented edge of the segment core piece or on the segment core piece itself. Alternatively, when allowed in performance, the above-described conditions are not imposed.

  Furthermore, the easy cutting part is not limited to either “V notch” or “narrowing”, and it goes without saying that the easy cutting part can be configured by combining “V notch” and “narrowing”. Yes.

  On the other hand, when the auxiliary joint in the strip-shaped core piece is removed by punching using a die (punch / die), the part cut into the segment core piece so that the cut portion does not remain in the segment core piece It is necessary to cut the auxiliary connecting portion. However, if the corresponding part of the segment core piece has a cutout in terms of performance or design, removing the auxiliary connecting part following the shape of the cutout will not leave a wasteful bite mark on the segment core piece. The auxiliary joint portion can be removed from the strip-shaped core piece.

  FIG. 7 shows another embodiment of the strip-shaped core piece used in the method for manufacturing a laminated core according to the present invention and the strip-shaped core piece according to the present invention. The edge has a notch in terms of performance or design.

  Adjacent segment core pieces 31 in the strip-shaped core piece 30 are connected to each other via a connecting portion 32 provided on the outer peripheral side of the segment core piece 31, more specifically, on the outer peripheral side of the meeting edge portion 31e in the divided yoke portion 31y. In addition, the segment core pieces 31 are connected to each other via an auxiliary connecting portion 33 provided on the inner peripheral side of the segment core piece 31, more specifically, on the inner peripheral side of the meeting edge portion 31e in the divided yoke portion 31y.

  The auxiliary connecting portion 33 and the segment core pieces 31, 31 are connected via easy-cut portions 34, 34, and the easy-cut portions 34 are both surfaces of the portion that has entered the segment core piece 31. Are formed by V notches 34v, 34v,... Arranged in a predetermined substantially arc shape.

  2 and 3 except for the easy-to-cut portion 34 composed of V notches 34v, 34v,... Arranged in a substantially arcuate shape at a portion entering the inside of the segment core piece 31. 7 is basically the same as the strip-shaped core piece 10 shown in FIG. 7, and therefore, in FIG. 7, the same reference numerals as those in FIG. 2 and FIG. The description is omitted by attaching the code of the number stand.

  In order to manufacture a laminated stator core using the above-described strip-shaped core piece 30, as shown in FIGS. 4 and 5, the strip-shaped core piece 30 formed in the pressing device is conveyed to the winding stacking apparatus, and the strip-shaped core piece 30 is obtained. Immediately before the winding step, the easy-cutting portions 34, 34 are punched out by the cutter device (see reference C in FIG. 4) made of a die (punch / die) to remove the auxiliary connecting portion 33, and then the winding is performed. This is performed by caulking and joining the strip-shaped core pieces 30 and 30 that are spirally wound around the mandrill of the laminating apparatus.

  According to the above-described configuration, a laminated iron core having excellent quality can be manufactured with good productivity in the same manner as the embodiment shown in FIGS. Further improvement in productivity and reduction in production cost can be achieved, and further improvement in workability can be achieved because the strip-shaped core piece resists deformation during handling.

  Furthermore, according to the above-described configuration, the easily cut portion 34 in the strip-shaped core piece 30 is formed in a portion that has entered the inside of the segment core piece 31, so that the auxiliary joint portion from the strip-shaped core piece 30 in the easily cut portion 34. By removing 33, the associated edge portions 31e of the segment core pieces 31 do not interfere with each other when the strip-shaped iron core piece 30 is wound, so that a laminated iron core having excellent shape accuracy can be manufactured. .

  FIG. 8 shows another embodiment of the strip-shaped core piece used in the method for manufacturing a laminated core according to the present invention and the strip-shaped core piece according to the present invention.

  FIG. 8 shows another embodiment of the strip-shaped core piece used in the method of manufacturing a laminated core according to the present invention and the strip-shaped core piece according to the present invention. The strip-shaped core piece 40 is also shown in FIG. Similar to the core piece 30, a segmental core piece 41 has a notch in performance or design at the meeting edge.

  Adjacent segment core pieces 41 in the strip-shaped core piece 40 are connected to each other via a connecting portion 42 provided on the outer peripheral side of the segment core piece 41, specifically, on the outer peripheral side of the meeting edge portion 41e in the divided yoke portion 41y. In addition, they are connected to each other via an auxiliary connecting portion 43 provided on the inner peripheral side of the segment core piece 41, specifically, on the inner peripheral side of the meeting edge portion 41e in the divided yoke portion 41y.

  The auxiliary connecting portion 43 and the segment core pieces 41 and 41 are connected to each other through easy-to-cut portions 44 and 44. The easy-to-cut portion 44 is a part of the part that enters the segment core piece 41. In the direction, V notches 44v, 44v,... Arranged in a predetermined substantially rectangular shape are formed.

  2 and 3 except for the easy-to-cut portion 44 composed of V notches 44v, 44v,... Arranged in a substantially rectangular shape at a portion entering the inside of the segment core piece 41. 8 is basically the same as the strip-shaped core piece 10 shown in FIG. 8, and therefore, in FIG. 8, the same reference numerals as those in FIG. 2 and FIG. The description is omitted by attaching the code of the number stand.

  In order to manufacture a laminated stator core using the above-described strip-shaped core piece 40, as shown in FIGS. 4 and 5, the strip-shaped core piece 40 formed in the press device is conveyed to the winding and stacking apparatus, and the strip-shaped core piece 40 is obtained. Immediately before the winding step, the easy-cutting portions 44 and 44 are punched out by the cutter device (see reference numeral C in FIG. 4) made of a die (punch / die) to remove the auxiliary joint portion 43, and then the winding is performed. This is performed by caulking and joining the strip-shaped core pieces 40, 40 wound spirally around the mandrill of the laminating apparatus.

  According to the above-described configuration, a laminated iron core having excellent quality can be manufactured with good productivity in the same manner as the embodiment shown in FIGS. Further improvement in productivity and reduction in production cost can be achieved, and further improvement in workability can be achieved because the strip-shaped core piece resists deformation during handling.

  Furthermore, according to the above-described configuration, the easily cut portion 44 in the strip-shaped core piece 40 is formed at a portion that has entered the inside of the segment core piece 41, so that the easily connecting portion 44 is connected to the auxiliary connecting portion from the strip-shaped core piece 40. By removing 43, the associated edge portions 41e of the segment core piece 41 do not interfere with each other when the belt-like core piece 40 is wound, and thus it is possible to manufacture a laminated core having excellent shape accuracy. .

  In addition, in the strip-shaped core piece 30 shown in FIG. 7, the easy-to-cut part 34 is comprised from V notches 34v, 34v ... formed in both surfaces of the segment core piece 31, and the strip-shaped core piece 40 shown in FIG. Then, the easy-cut portion 44 is composed of V notches 34v, 34v ... formed on one side of the segment core piece 41, but is the V-notch constituting these easy-cut portions formed on one side of the segment core piece 41? Needless to say, the formation on both sides is an arbitrary design matter that can be appropriately selected.

  Further, in each of the above-described embodiments, an example in which the present invention is applied to the manufacture of a laminated stator core (stator) in an electric motor has been shown, but of course also related to the production of a laminated rotor core (rotor) in an electric motor. Of course, the present invention can be applied very effectively.

(a) And (b) is the top view and side view of a laminated core manufactured by the manufacturing method and strip | belt-shaped core piece concerning this invention. The top view which shows the strip | belt-shaped iron core piece concerning this invention. (a) is a principal part top view of the strip | belt-shaped iron core piece concerning invention, (b) is the principal part enlarged view in (a), (c) is the cc sectional view taken on the line in (b). The conceptual diagram which shows the manufacturing apparatus for enforcing the manufacturing method of the laminated core concerning this invention. The top view of the strip | belt-shaped core piece which showed the aspect which manufactures a laminated core in the manufacturing apparatus of FIG. 4 notionally. (a) is the principal part top view which shows the other Example of the strip | belt-shaped iron core piece concerning this invention, (b) is the principal part enlarged view in (a), (c) is the cc line in (b). Sectional drawing. (a) is the principal part top view which shows the other Example of the strip | belt-shaped iron core piece concerning this invention, (b) is the principal part enlarged view in (a), (c) is the cc line in (b). Sectional drawing. (a) is the principal part top view which shows the other Example of the strip | belt-shaped iron core piece concerning this invention, (b) is the principal part enlarged view in (a), (c) is the cc line in (b). Sectional drawing. (a) And (b) is the top view and side view of the laminated iron core manufactured by the conventional manufacturing method and strip | belt-shaped iron core pieces. The conceptual diagram which shows the manufacturing apparatus for manufacturing the conventional laminated iron core.

Explanation of symbols

1 ... Laminated core (laminated stator core),
10, 20, 30, 40 ... strip-shaped iron core pieces,
11, 21, 31, 41 ... segment core piece,
11e, 21e, 31e, 41e, 51e ... meeting edge,
12, 22, 32, 42 ... connecting part,
13, 23, 33, 43 ... auxiliary connecting part,
14, 24, 34, 44 ... Easy cutting part.

Claims (4)

A laminated core by laminating a plurality of segment core pieces having a substantially fan shape connected in a linearly extending shape via a connecting portion provided on the outer peripheral side while being spirally wound. A method of manufacturing
On the inner peripheral side between the segment core pieces adjacent to each other, using the strip-shaped iron core piece formed with an auxiliary connecting portion via an easy-cut portion,
A method of manufacturing a laminated core, comprising a step of removing the auxiliary connecting portion from the strip-shaped core piece at the easy-cutting portion immediately before the step of spirally winding the strip-shaped core piece. 2. The method of manufacturing a laminated core according to claim 1, wherein the easy-cut portion in the strip-shaped core piece is formed in a portion that enters the segment core piece. A plurality of segment core pieces having a substantially fan shape are connected to a shape extending linearly via a connecting portion provided on the outer peripheral side, and are laminated while being spirally wound to form a laminated core. A strip of iron core,
A strip-shaped core piece, wherein an auxiliary connecting portion is formed on an inner peripheral side between the adjacent segment core pieces via an easily cut portion. The strip-shaped iron core piece according to claim 3, wherein the easy-cut portion is formed at a portion that enters the inside of the segment core piece.

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