JP2009142065A - Method of manufacturing laminated core and strip core piece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core by spirally winding and stake-laminating a strip core piece formed by connecting a plurality of roughly sector-shaped segment core pieces, having a staked portion in a linearly-extending shape through joining portions, and the strip core piece used for the method, capable of manufacturing a laminated core with excellent accuracy of form, electric characteristics and mechanical strength. <P>SOLUTION: The method of manufacturing the laminated core employs the strip core piece formed by connecting the adjacent segment core pieces by the joining portions formed outside the outer circumference of the respective segment core pieces. The method includes a step of removing the joining portions from the strip core piece after the strip core piece is spirally wound and stake-laminated. The strip core piece is formed by connecting the adjacent segment core pieces, using the joining portions formed outside the outer circumference of the respective segment core pieces. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 formed with caulking portions are connected to a shape extending linearly via a connecting portion. The present invention relates to a method for manufacturing a laminated core by caulking and laminating a strip-shaped iron core piece wound in a spiral shape, 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. 8 shows an example of a laminated stator core manufactured by the above-described method. This laminated stator core A has salient poles St, St... Projecting radially inward from a ring-shaped yoke. And a strip-shaped core piece W (see FIG. 10) 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, J. The strip-shaped core pieces W are laminated while being spirally wound, and the wound strip-shaped core pieces W, W... Are joined together by caulking portions Sc, Sc.

Further, as a typical process for manufacturing the laminated stator core A, as shown in FIGS. 9 and 10, the strip-shaped core piece W is continuously formed from the strip-shaped steel plate in the pressing device P, and then the strip-shaped core core A is formed. An integral laminated stator core A is manufactured by caulking and joining the laminated strip-shaped core pieces W while feeding the core pieces W to the winding laminating apparatus M and winding them around the mandrill Mm of the winding laminating apparatus M. .
Japanese Patent Application Laid-Open No. 1-264548

    By the way, as shown in FIG. 10 and FIG. 11, the strip | belt-shaped iron core piece W for manufacturing the said laminated stator core A is made into the connection part J which connects several segment core piece S, S ... and each meeting edge part Se. , J ... are connected, but the connecting portion J is 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. It is shaped as thin as possible.

  On the other hand, in the winding and laminating step described above, the strip-shaped core piece W is desired while bending the connecting portion J as shown in FIG. 11 (b) to bring the joining edge portion Se between the adjacent segment core pieces S close to each other. When the connecting portion J is plastically deformed in the state of winding in the shape, the swollen strip in the thickness direction of the strip-shaped core piece W is generated.

  In this state, when the strip-shaped core pieces W are stacked while being spirally wound, a gap is generated between the segment core pieces S stacked one above the other due to the swelling of the connecting portion J described above. As a result, the density of the laminated layer is lowered, and there is a disadvantage in that the performance required for the laminated core, such as the shape accuracy and electrical characteristics of the laminated stator core A as a product, is lowered.

  Therefore, in order to eliminate the above inconvenience, in the conventional laminated stator core A, as shown in FIG. 11 (c), when the belt-like core pieces W are laminated while being spirally wound, they interfere with the lower connecting portion J. By forming an opening So (or a notch not shown) that accommodates and absorbs the swelling of the connecting portion J in a part of the segment core piece S to be wound, the wound strip-shaped core pieces W adhere to each other. Are configured to be stacked.

  However, in the configuration in which the opening So is formed in each segment core piece S, S... In order to avoid the interference with the connecting portion J as described above, the electrical characteristics are caused by the opening So (or notch). Not only lowering but also forming the opening So in the segment core piece S of the strip-shaped core piece W reduces the mechanical strength of the individual segment core pieces S, S. There is inconvenience to be invited.

  An object of the present invention is to provide a method of manufacturing a laminated core and a strip-shaped core piece capable of producing a laminated core excellent in shape accuracy, electrical characteristics, and mechanical strength in view of the above-described actual situation. There is to do.

In order to achieve the above object, a method of manufacturing a laminated core according to the invention of claim 1 is a shape in which a plurality of segment core pieces having a substantially fan shape formed with caulking portions are linearly extended via connecting portions. A method of manufacturing a laminated core by laminating a strip-shaped core piece connected to the coil while being spirally wound,
Using the strip-shaped core pieces formed by connecting adjacent segment core pieces to each other by a connecting portion formed on the outer periphery of each segment core piece,
The present invention is characterized by including a step of removing the connecting portion from the strip-shaped core piece after the strip-shaped core pieces are caulked and stacked while being spirally wound.

  The manufacturing method of the laminated core according to the invention of claim 2 is the manufacturing method of the laminated core according to the invention of claim 1, wherein an easily cut portion is formed near the outer periphery of the segment core piece in the connecting portion of the belt-like core pieces. It is a feature.

  The method for manufacturing a laminated core according to the invention of claim 3 is the manufacturing method of the laminated core according to claim 1 or 2, wherein the connecting portion of the strip-shaped core pieces is formed into an arc shape, a curved shape, or an uneven curved shape. It is characterized by the formation.

The strip-shaped iron core piece according to the invention of claim 4 is formed by connecting a plurality of segment core pieces having a substantially fan shape formed with caulking portions to a shape extending linearly via a connecting portion, and in a spiral shape. A strip-shaped core piece that forms a laminated core by being caulked and laminated while being wound,
Adjacent segment core pieces are connected by a connecting portion formed on the outer periphery of each segment core piece.

  The strip-shaped core piece related to the invention of claim 5 is characterized in that in the strip-shaped core piece related to the invention of claim 4, an easily cut portion is formed near the outer periphery of the segment core piece in the connecting portion.

  The strip-shaped core piece related to the invention of claim 6 is characterized in that, in the strip-shaped core piece related to the invention of claim 4 or claim 5, the connecting portion is formed in an arc shape, a curved shape, or an uneven curved shape.

    According to the method for manufacturing a laminated core according to the invention of claim 1, the strip-shaped core pieces formed by connecting adjacent segment core pieces to each other by a connecting portion formed outside the outer periphery of each segment core piece, After caulking and laminating the strip-shaped core pieces while spirally winding the strip-shaped core pieces, removing the connecting portions from the strip-shaped core pieces removes the connecting portions that are deformed and swollen when the strip-shaped core pieces are wound. Thus, there is no gap between the segment core pieces stacked one above the other, so that it is possible to manufacture a laminated core excellent in shape accuracy and electrical characteristics.

  Further, according to the method for manufacturing a laminated core according to the invention of claim 1, it is swollen by bending deformation by removing the connecting portion which is deformed and swollen when the strip-shaped core piece is wound as described above. In order to avoid interference with the connecting portion, it is not necessary to form an opening or notch in a part of the segment core piece, and thus it becomes possible to manufacture a laminated core excellent in mechanical strength and electrical characteristics. .

  According to the method for manufacturing a laminated core according to the invention of claim 2, by forming an easily cut portion near the outer periphery of the segment core piece at the connecting portion of the strip-shaped core pieces, caulking while winding the strip-shaped core pieces spirally After the lamination, when the connecting portion is removed from the segment core piece, the connecting portion can be removed very easily.

  According to the method for manufacturing a laminated core according to the invention of claim 3, the bending stress generated when the strip-shaped core piece is wound by forming the connecting portion of the strip-shaped core pieces in an arc shape, a curved shape, or an uneven curved shape. Is effectively absorbed by the shape of the connecting portion, and it is possible to reduce or prevent the bending stress of the connecting portion from affecting the segment core piece, and thus it is possible to manufacture a laminated core excellent in shape accuracy and electrical characteristics. Become.

  According to the strip-shaped core piece relating to the invention of claim 4, the adjacent segment core pieces are connected to each other by the connecting portion formed outside the outer periphery of each segment core piece, so that the strip-shaped core piece is spirally wound. While caulking and laminating, by removing the connecting portion that is deformed and swollen when the strip-shaped core pieces are wound, there is no gap between the segment core pieces laminated vertically, Therefore, it becomes possible to manufacture a laminated core excellent in shape accuracy and electrical characteristics.

  Further, according to the strip-shaped core piece relating to the invention of claim 4, as described above, the connecting portion that is swollen by bending deformation is removed by removing the connecting portion that is deformed and swollen when the strip-shaped core piece is wound. Therefore, it is not necessary to form an opening or a notch in a part of the segment core piece, and it is possible to manufacture a laminated core having excellent mechanical strength and electrical characteristics.

  According to the strip-shaped iron core piece relating to the invention of claim 5, since the easily cut portion is formed near the outer periphery of the segment core piece in the connecting portion, when the connecting portion is removed from the segment core piece, the connecting portion is extremely It can be easily removed.

  According to the strip-shaped core piece relating to the invention of claim 6, by forming the connecting portion in an arc shape, a curved shape, or an uneven curved shape, the bending stress generated when the strip-shaped core piece is wound depends on the shape of the connecting portion. It is possible to reduce or prevent that the bending stress of the connecting portion is effectively absorbed and affect the segment core piece, and thus it is possible to manufacture a laminated iron core having excellent shape accuracy and electrical characteristics.

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. 2, and a plurality of segment core pieces 11, 11... Having a substantially fan shape are connected via connecting portions 12, 12... Formed on the outer periphery of each segment core piece 11. , Using a strip-shaped core piece 10 connected in a linearly extending shape along the axis XX, and laminating the strip-shaped core piece 10 while spirally winding the strip-shaped core piece 10, 10 are manufactured by caulking and fixing each other.

  As shown in FIG. 2, the strip-shaped iron core piece 10 has a plurality of segment core pieces 11, 11..., And each segment core piece 11 has a substantially fan-like shape constituting the yoke of the laminated stator core 1 described above. A split yoke portion 11y and salient poles 11t protruding from the inner peripheral side of the split yoke portion 11y are formed, and a plurality of crimped portions 11c, 11c are formed.

  Adjacent segment core pieces 11 are connected to each other via a connecting portion 12 formed outside the outer periphery of the segment core piece 11, and the connecting portion 12 is adjacent to the adjacent segment core as shown in FIG. While having a substantially circular arc shape extending between the pieces 11 and 11, easy-to-cut portions 12 c and 12 c each formed of “neck” are formed near the outer periphery of the segment core piece 11 at both ends of the connecting portion 12. .

  Here, the connecting portion 12 can easily wind the strip-shaped core piece 10 in a winding and laminating process in the winding and laminating apparatus M described later, and bending stress is generated when the strip-shaped core piece 10 is wound. Even if it occurs, it is preferable to have a shape that can reduce or prevent the stress from affecting the segment core piece 11. In the strip-shaped core piece 10 shown in FIGS. 2, 4, and 5, as described above. The connecting portion 12 is formed in a substantially arc shape.

  In order to manufacture the laminated stator core 1 shown in FIG. 1 using the above-described strip-shaped core piece 10, the strip-shaped core piece 10 is continuously formed from the strip-shaped steel plate in the press device P as shown in FIGS. After the formation, the strip-shaped core piece 10 is conveyed to the winding and laminating apparatus M.

  Next, each of the segment core pieces 11, 11... Is crimped while the strip-shaped core piece 10 fed into the winding laminating apparatus M is wound around the mandrill Mm and spirally wound (see FIGS. 4 and 5B). After caulking and laminating via the part 11c, the connecting part 12 is cut at the left and right easy-to-cut parts 12c and 12c by the cutter apparatus Mc installed in the winding laminating apparatus M, so that the adjacent segment core pieces 11 and 11 It is removed (see FIG. 5C).

  In this way, after the strip-shaped core piece 10 fed into the winding laminating apparatus M is wound around the mandrill Mm and spirally wound while being caulked and laminated, through the step of removing the connecting portion 12 from the segment core pieces 11, 11, Furthermore, the integral laminated stator core 1 is manufactured by repeating the winding of the strip-shaped iron core piece 10, the caulking lamination, and the removal of the connecting portion 12.

  According to the above-described configuration, the strip-shaped core pieces 10 formed by connecting the adjacent segment core pieces 11 to each other by the connecting portion 12 formed outside the outer periphery of each segment core piece 11 are spirally wound. After caulking and laminating while being wound in a shape, the connecting portion 12 is removed from the strip-shaped core piece 10, thereby removing the connecting portion 12 that is deformed and swollen when the strip-shaped core piece 10 is wound. The laminated stator core 1 having excellent shape accuracy and electrical characteristics can be manufactured without generating a gap between the segment core pieces 11 laminated vertically.

  Moreover, according to the said structure, in order to avoid interference with the connection part 12 swollen by bending deformation by removing the connection part 12 which deform | transformed when the strip | belt-shaped iron core piece 10 was wound, and produced swelling. In addition, it is not necessary to form an opening or notch in a part of the segment core piece 11, and thus the laminated stator core 1 excellent in mechanical strength and electrical characteristics can be manufactured.

  Moreover, according to the said structure, since the connection part 12 of the strip | belt-shaped iron core piece 10 was formed in the substantially circular arc shape, the bending stress generate | occur | produced at the time of winding of the strip | belt-shaped iron core piece 10 is effectively absorbed by the said connection part 12. FIG. Accordingly, it is possible to reduce or prevent the bending stress of the connecting portion 12 from affecting the segment core piece 11, and thus it is possible to manufacture the laminated stator core 1 having excellent shape accuracy and electrical characteristics.

  Further, according to the above configuration, the easily cut portions 12c and 12c are formed near the outer periphery of the segment core piece 11 in the connecting portion 12 of the strip-shaped core piece 10, so that the strip-shaped core piece 10 is spirally wound. After caulking and laminating, when removing the connecting portion 12 from the segment core piece 11, the connecting portion 12 can be removed very easily.

  Here, as a means for removing the connecting portion 12 from the strip-shaped core piece 10, a method of cutting the root of the connecting portion 12 with a die (punch / die) in synchronization with the winding process of the strip-shaped core piece 10 is preferable. However, the method may be a method in which the easy-to-cut portion 12c formed by “constriction” of the connecting portion 12 is used as a starting point, and the connecting portion 12 can be removed by cutting.

  Moreover, in the connection part 12 in the strip | belt-shaped iron core piece 10 mentioned above, although the easy-to-cut part 12c of the shape narrowly bound is formed in the connection part with the segment core piece 11, the said easy-to-cut part is formed by "V notch". The easy-cut portion is not limited to either “neck” or “V-notch”, and the easy-cut portion can also be formed by a combination of “neck” and “V-notch”. It goes without saying that it can be configured.

  Further, in the above-described strip-shaped core piece 10, the shape of the connecting portion 12 is substantially arc-shaped in order to effectively absorb the bending stress generated when the strip-shaped core piece 10 is wound, but the segment core pieces are connected to each other. The shape of the connecting portion is not limited to the above-described substantially arc shape, and may be any shape as long as it can absorb bending stress generated when the strip-shaped core piece 10 is wound, and an appropriate shape can be adopted. Needless to say.

  FIG. 6 shows another embodiment of the strip-shaped core piece used in the method for manufacturing the laminated core according to the present invention and the strip-shaped core piece according to the present invention, and adjacent segment core pieces 21 in the strip-shaped core piece 20. They are connected to each other via a connecting portion 22 formed outside the outer periphery of the segment core piece 21. As shown in FIG. 6A, the connecting portion 22 is bent, specifically, substantially Ω-shaped. It is formed to span between adjacent segment core pieces 21, 21.

  The configuration of the above-described strip-shaped core piece 20 is basically the same as that of the embodiment shown in FIGS. 1 to 5 except for the shape of the connecting portion 22, and therefore has the same function as the constituent elements of the strip-shaped core piece 10. In FIG. 6, reference numerals in the 20s in which 10 is added to the same reference numerals as in FIGS.

  Further, in the method of manufacturing a laminated stator core using the above-described strip-shaped core pieces 20, the strip-shaped core pieces 20 are wound in a winding and laminating apparatus as in the embodiment shown in FIGS. 1 to 5 (FIG. 6B). After the segment core pieces 21, 21... Are caulked and laminated, the connecting portion 22 is removed (see FIG. 6C), and the integrated laminated stator core is manufactured.

  FIG. 7 shows another embodiment of the strip-shaped core piece used in the method for manufacturing the laminated core according to the present invention and the strip-shaped core piece according to the present invention. 31 are connected to each other via a connecting portion 32 formed on the outer periphery of the segment core piece 31. As shown in FIG. 7A, the connecting portion 32 has an uneven curved shape, specifically a meandering shape. It is formed to span between adjacent segment core pieces 31, 31.

  In addition, since the structure of the strip | belt-shaped core piece 30 mentioned above is fundamentally the same as the Example shown in FIGS. 1-5 except the shape in the connection part 32, it comprises the same effect | action as the component of the strip-shaped core piece 10. FIG. In FIG. 7, reference numerals in the 30s are added to the same reference numerals as those in FIGS. 1 to 5 and 20 is omitted.

  Further, in the method of manufacturing a laminated stator core using the strip-shaped core piece 30, the strip-shaped core piece 30 is wound in a winding and laminating apparatus as in the embodiment shown in FIGS. 1 to 5 (FIG. 7B). After the segment core pieces 31 are crimped and stacked, the connecting portion 32 is removed (see FIG. 7C), whereby an integrated stacked stator core is manufactured.

  As described above, according to the strip-shaped core piece shown in FIGS. 6 and 7 and the method of manufacturing the laminated stator core using the strip-shaped core piece, the connecting portion is bent (specifically, substantially Ω-shaped). , Dish-like shape), or uneven curved shape (specifically, meandering shape), the bending stress generated when winding the strip-shaped iron core piece is effectively absorbed only by the connecting part based on its shape. Since the influence on the segment core piece can be reduced or prevented, a laminated core excellent in shape accuracy and electrical characteristics can be manufactured.

  Moreover, it is also possible to form an easy-cut portion made of “neck”, “V notch”, or the like near the outer periphery of the segment core piece 21 in the connecting portion 22 of the above-described band-shaped core piece 20. In the manufacturing process of the stator core, the connecting portion 12 can be easily removed from the segment core piece 21.

  Similarly, it is possible to form an easy-cut portion made of “neck”, “V notch”, or the like near the outer periphery of the segment core piece 31 in the connecting portion 32 of the above-described strip-shaped core piece 30, thereby stacking layers. In the manufacturing process of the stator core, the connecting portion 32 can be easily removed from the segment core piece 31.

  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.Of course, the invention also relates 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. 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. 3 notionally. (a) is the principal part top view which shows the Example of the strip | belt-shaped core piece concerning this invention, (b) is the principal part enlarged view which shows the state which wound the strip | belt-shaped core piece, (c) is the state which removed the connection part. The principal part enlarged view which shows. (a) is the principal part top view which shows the other Example of the strip | belt-shaped core piece concerning this invention, (b) is a principal part enlarged view which shows the state which wound the strip | belt-shaped core piece, (c) removed a connection part. The principal part enlarged view which shows the state which carried out. (a) is a principal part top view which shows further another Example of the strip | belt-shaped core piece concerning this invention, (b) is a principal part enlarged view which shows the state which wound the strip | belt-shaped core piece, (c) is a connection part. The principal part enlarged view which shows the state removed. (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. 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. 9 notionally. (a) is a plan view of a main part showing a conventional strip-shaped core piece, (b) is a plan view of a main part showing a state where the conventional strip-shaped core piece is wound, and (c) is a caulking lamination of the wound strip-shaped core piece. The principal part top view which shows the state which carried out.

Explanation of symbols

1 ... Laminated core (laminated stator core),
10, 20, 30 ... strip-shaped core pieces,
11, 21, 31 ... segment core piece,
12, 22, 32 ... connecting part,
12c: Easy cutting part.

Claims (6)

By caulking and laminating a strip-shaped core piece formed by connecting a plurality of segment core pieces having a substantially fan shape forming a caulking part in a shape extending linearly via a connecting part while being spirally wound A method of manufacturing a laminated core,
Using the strip-shaped core pieces formed by connecting the segment core pieces adjacent to each other by a connecting portion formed outside the outer periphery of each segment core piece,
A method of manufacturing a laminated core, comprising the step of caulking and laminating the strip-shaped core pieces while spirally winding the strip-shaped core pieces, and then removing the connecting portion from the strip-shaped core pieces. 2. The method of manufacturing a laminated core according to claim 1, wherein an easily cut portion is formed near the outer periphery of the segment core piece at the connecting portion in the strip-shaped core piece. 3. The method for manufacturing a laminated core according to claim 1, wherein the connecting portion in the strip-shaped core piece is formed in an arc shape, a curved shape, or an uneven curved shape. A plurality of segment core pieces having a substantially fan shape forming caulking portions are connected to a shape extending linearly via a connecting portion, and the laminated iron core is formed by caulking and laminating while being spirally wound. A strip-shaped core piece to be formed,
Adjacent segment core pieces are connected to each other by a connecting portion formed outside the outer periphery of each segment core piece. The strip-shaped core piece according to claim 4, wherein an easily cut portion is formed near the outer periphery of the segment core piece in the connecting portion. The strip-shaped core piece according to claim 4 or 5, wherein the connecting portion is formed in an arc shape, a curved shape, or an uneven curved shape.

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