JP2006081302A - Manufacturing method for laminated stator core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for laminated stator cores, to which a construction in which strip-shaped core pieces are spirally wound and laminated together is applied, wherein a laminated stator core that is superior in form accuracy and in the electrical characteristics can be manufactured. <P>SOLUTION: The manufacturing method for laminated stator cores includes the steps of stamping a metal sheet to form strip-shaped yoke core pieces that have, such a shape that the yoke of a laminated stator core is expanded linearly, and have coupling recesses at their side edges equivalent to the inner circumferential surface; spirally winding the strip-shaped yoke core pieces, laminating them, and coupling them together, by caulking to form a yoke laminate; stamping a metal sheet to form magnetic pole core pieces having coupling projections at their base; laminating a predetermined number of magnetic pole core pieces, and coupling them together by caulking to form a magnetic pole laminate; and winding wires on the magnetic pole laminate, and fitting the coupling projections into the coupling recesses to couple together the yoke laminate and the magnetic pole laminate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a method of manufacturing a laminated stator core, and more particularly to a method of manufacturing a laminated stator core to which a configuration in which strip-shaped core pieces are wound in a spiral manner and stacked on each other is applied.

    Large-sized laminated cores incorporated in drive motors that generate high horsepower are used.When manufacturing such large-sized laminated cores, for example, laminated stator cores, large-scale manufacturing equipment (molding equipment) ) Is required, resulting in high costs, and further, there is a problem in that the yield when cutting the core material is greatly reduced.

  As a technique for solving the above inconvenience, by punching and forming a strip-shaped core piece having a shape in which a laminated stator core is linearly expanded from a metal plate, the strip-shaped core pieces are spirally wound and laminated together, A method of manufacturing a laminated stator core is provided (see, for example, Patent Document 1 and Patent Document 2).

  A laminated stator core A shown in FIG. 12 includes a yoke Y having a cylindrical shape and a predetermined number of salient poles T, T... Projecting radially inward from the yoke Y, and has a belt-like core as shown in FIG. A strip-shaped core piece S in which magnetic pole portions St, St... Are formed on a side edge corresponding to the inner periphery of the yoke portion Sy that extends in a straight line is wound and laminated along the outer periphery of the guide G. It is manufactured by pressing the stacked strips S, S... From above and below and crimping them together or fixing them together by welding.

According to such a method of manufacturing a laminated stator core, a large-scale manufacturing apparatus (molding apparatus) is not required, and the yield when cutting the core material is improved, so that the cost related to manufacturing is increased. It can be avoided.
JP-A-11-299136 JP 2000-224817 A

    By the way, in the conventional manufacturing method as described above, since the planar shape of the strip-shaped core piece S constituting the laminated stator core A is extremely complicated, there is a variation in the degree of deformation at each place when it is spirally wound. It is difficult to wind the strip-shaped iron core piece S into a perfect circle due to factors such as the occurrence of the magnetic field. Further, since it is easy to cause a deviation between the stacked magnetic pole portions St, St. There has been a problem that the accuracy of the shape of the laminated stator core A is greatly reduced.

  Further, in the conventional manufacturing method as described above, the yoke Y and the magnetic poles T, T... In the laminated stator core A are integrally formed, so that it is difficult to wind the winding around the individual magnetic poles T. There is a disadvantage in that the electrical characteristics are deteriorated due to the disturbance of the winding.

  An object of the present invention is to provide a method of manufacturing a laminated stator core capable of producing a laminated stator core excellent in shape accuracy and electrical characteristics in view of the above-described actual situation.

    In order to achieve the above object, a method of manufacturing a laminated stator core according to the invention of claim 1 has a shape in which a yoke of the laminated stator core is linearly developed, and has a connecting recess on a side edge corresponding to the inner periphery. A step of punching and forming the strip-shaped yoke core pieces from the metal plate, a step of spirally winding and stacking the strip-shaped yoke core pieces, and caulking and bonding each other to form a yoke laminate, and a connecting projection at the base end Forming a magnetic pole core piece from a metal plate, laminating a predetermined number of magnetic core pieces and caulking them together to form a magnetic pole laminate, connecting the magnetic pole laminate after winding A step of fitting the connecting convex portion into the concave portion and connecting the yoke laminate and the magnetic pole laminate to each other.

  According to a second aspect of the present invention, there is provided a method for manufacturing a laminated stator core comprising: a strip-shaped yoke core piece having a shape in which a yoke of the laminated stator core is linearly developed and having a connecting recess on an inner peripheral equivalent side edge; After the stamping and forming step, the side edges corresponding to the outer periphery of the strip-shaped yoke core pieces are locally pressed and spread in the longitudinal direction, the strip-shaped yoke core pieces are spirally wound and laminated, and then crimped together. A step of forming a yoke laminate, a step of punching and forming magnetic pole core pieces having connecting projections at the base end from a metal plate, a predetermined number of magnetic pole core pieces are laminated, and caulking together to form a magnetic pole laminate. And a step of connecting the yoke stack and the magnetic pole stack to each other by fitting the connecting protrusion into the connecting recess after winding the magnetic pole stack.

  A method for manufacturing a laminated stator core according to the invention of claim 3 is the method for producing a laminated stator core according to claim 1 or 2, wherein the yoke laminate is formed after the step of forming the yoke laminate. And a step of correcting the shape of the yoke laminate by applying an expanding force from the inner diameter side of the yoke laminate before the step of connecting the magnetic pole laminate and the magnetic pole laminate.

  The manufacturing method of the laminated stator core according to the invention of claim 4 is the manufacturing method of the laminated stator core according to any one of claims 1 to 3, wherein Is characterized in that the tip has a wide tapered shape.

  The manufacturing method of the laminated stator core according to the invention of claim 5 is the manufacturing method of the laminated stator core according to any one of claims 1 to 3, wherein the connecting convex portion in the magnetic pole laminate is provided. Is characterized in that minute projections are formed on the side portions.

  The method for manufacturing a laminated stator core according to the invention of claim 6 is the method for producing a laminated stator core according to any one of claims 1 to 5, wherein The fitting fixing portion is pressed and formed in at least one of the connecting concave portion and the connecting convex portion after fitting the connecting convex portion of the magnetic pole laminate.

According to the method for manufacturing a laminated stator core according to the invention of claim 1, the yoke laminate constituting the yoke of the laminated stator core and the magnetic pole laminate constituting the magnetic pole of the laminated stator core are separately formed. Therefore, the strip-shaped yoke core piece constituting the yoke laminate has a relatively narrow strip shape, and a connecting recess is formed on the side edge corresponding to the inner periphery of the strip-shaped yoke core piece. The bend formability of the strip-shaped yoke core pieces is greatly improved, and the yoke laminate formed by winding the strip-shaped yoke core pieces can be formed into a perfect circle.
Further, since the magnetic pole laminate is formed by caulking and laminating a predetermined number of magnetic pole core pieces, the magnetic pole laminate is manufactured without causing a gap between the laminated magnetic pole core pieces, and thus the yoke laminate is formed in the yoke laminate. A laminated stator core formed by connecting a predetermined number of magnetic pole laminates has excellent shape accuracy.
Furthermore, since the magnetic pole laminate is formed separately from the yoke laminate, the winding work for the magnetic pole laminate becomes extremely easy, and the winding can be wound with high density and good proportions. can do.
Thus, according to the method for manufacturing a laminated stator core according to the invention of claim 1, it is possible to produce a laminated stator core having excellent shape accuracy and electrical characteristics.

According to the method for manufacturing a laminated stator core according to the invention of claim 2, the yoke laminated body constituting the yoke of the laminated stator core and the magnetic pole laminated body constituting the magnetic pole of the laminated stator core are separately formed. Therefore, the strip-shaped yoke core piece constituting the yoke laminate has a relatively narrow strip shape, and the connecting concave portion is formed on the side edge corresponding to the inner periphery of the strip-shaped yoke core piece. The bend formability of the strip-shaped yoke core pieces is greatly improved, and the yoke laminate formed by winding the strip-shaped yoke core pieces can be formed into a perfect circle.
Furthermore, before the strip-shaped yoke core piece is spirally wound, the side-corresponding side edge of the strip-shaped yoke core piece is locally pressed and spread in the longitudinal direction, thereby further winding the strip-shaped yoke core piece. Therefore, the roundness of the yoke laminate formed by winding the strip-shaped yoke core pieces is further improved, and the shape accuracy of the yoke laminate is extremely excellent.
Further, since the magnetic pole laminate is formed by caulking and laminating a predetermined number of magnetic pole core pieces, the magnetic pole laminate is manufactured without causing a gap between the laminated magnetic pole core pieces, and thus the yoke laminate is formed in the yoke laminate. A laminated stator core formed by connecting a predetermined number of magnetic pole laminates has excellent shape accuracy.
Furthermore, since the magnetic pole laminate is formed separately from the yoke laminate, the winding work for the magnetic pole laminate becomes extremely easy, and the winding can be wound with high density and good proportions. can do.
Thus, according to the method for manufacturing a laminated stator core according to the invention of claim 2, it is possible to produce a laminated stator core having excellent shape accuracy and electrical characteristics.

  According to the method for manufacturing a laminated stator core according to the invention of claim 3, the shape is corrected by applying an expanding force from the inner diameter side to the yoke laminate formed by winding the strip-like yoke core piece. Therefore, it is possible to improve the roundness of the yoke laminate, and thus it is possible to manufacture a laminated stator core with better shape accuracy.

  According to the method of manufacturing the laminated stator core according to the invention of claim 4, the coupling strength between the yoke laminate and the pole laminate is greatly increased by forming the tip of the connecting convex portion in the pole laminate to have a wide tapered shape. An improved laminated stator core can be manufactured.

  According to the method for manufacturing a laminated stator core according to the invention of claim 5, the coupling strength between the yoke laminate and the pole laminate is greatly increased by forming the minute projections on the side of the connecting convex portion in the pole laminate. An improved laminated stator core can be manufactured.

  According to the method for manufacturing a laminated stator core according to the invention of claim 6, after fitting the connecting convex portion of the magnetic pole laminate into the connecting concave portion of the yoke laminate, the fitting is fitted into at least one of the connecting concave portion and the connecting convex portion. By pressing the fixing portion, it is possible to manufacture a laminated stator core in which the coupling strength between the yoke laminate and the magnetic pole laminate is significantly improved.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 7 show a method of manufacturing a laminated stator core according to the first invention, and the laminated stator core 1 manufactured according to the present invention has a single yoke laminate having an annular shape. 10 and a predetermined number (12 in the embodiment) of magnetic pole laminates 20, 20... Coupled to the inner diameter of the yoke laminate 10.

  The yoke laminate 10 is formed by spirally winding and laminating strip-shaped yoke core pieces 11 formed by stamping from a strip-shaped steel plate (metal plate) as will be described later, and by caulking and bonding (caulking stacking) to each other. A predetermined number (12 in the embodiment) of connecting recesses 11a, 11a,... Are formed on the inner peripheral edge of the yoke laminate 10. In addition, the code | symbol 11c in a figure is the crimping part formed in the said strip | belt-shaped yoke iron core piece 11. FIG.

  On the other hand, the magnetic pole laminate 20 is formed by laminating a predetermined number of magnetic pole core pieces 21, 21... Punched and formed from a strip-shaped steel plate (metal plate) as will be described later and caulking them together (caulking laminating). In addition, at the base end of each magnetic pole laminate 20, a connecting convex portion 21a that fits with the connecting concave portion 11a of the yoke laminate 10 described above is formed. In addition, the code | symbol 21c in a figure is the crimping part formed in each magnetic pole core piece 21,21 ....

  The above-mentioned yoke laminated body 10 and the magnetic pole laminated bodies 20, 20... Are integrally connected by fitting the coupling convex portions 21a of the individual magnetic pole laminated bodies 20 into the respective connected concave portions 11a, 11a. As a result, the laminated stator core 1 having a predetermined shape in which a predetermined number of magnetic pole laminates 20, 20... Protrude in the inner diameter direction of the yoke laminate 10 is manufactured.

  Below, the manufacturing procedure of the lamination | stacking stator core which concerns on this invention is demonstrated in detail by exemplifying the manufacturing procedure of the lamination | stacking stator core 1 mentioned above.

First, as shown in FIG. 3A, the strip-shaped yoke core piece 11 is formed by stamping from an electromagnetic steel plate (metal plate) not shown.
The strip-shaped yoke core piece 11 has a shape in which the yoke of the laminated stator core 1 described above is linearly developed, specifically, a narrow strip shape that extends straight, and has a predetermined width in the central region. The caulking portions 11c, 11c,... Are arranged at a pitch.

  Further, the side edge 11i corresponding to the inner periphery of the strip-shaped yoke core piece 11, that is, the inner peripheral surface of the yoke laminate 10 (see FIG. 2) is formed when the strip-shaped yoke core piece 11 is wound in a later step. The connection recesses 11a, 11a,... Are arranged at a predetermined pitch in the part.

  Here, the formation pitch of the connecting recesses 11a, 11a,... Is set so that the connecting recesses 11a coincide with each other when the strip-shaped yoke core pieces 11 are spirally wound and stacked in a later step. Similarly, the formation pitch of the crimped portions 11c, 11c,... Is set so that the crimped portions 11c match each other when the strip-shaped yoke iron core pieces 11 are spirally wound and stacked in a later step.

  After the strip-shaped yoke core piece 11 is formed by punching from an electromagnetic steel plate (metal plate), the strip-shaped yoke core piece 11 is carried into a manufacturing apparatus (not shown), and as shown in FIG. Are stacked in a spiral manner and are joined together by caulking to form the yoke laminate 10 (see FIG. 2B).

  Specifically, one end of the strip-shaped yoke core piece 11 is locked to the winding guide G of the manufacturing apparatus, and the strip-shaped yoke core piece 11 is rotated as indicated by the arrow R while being loaded into the winding guide G as indicated by the arrow F. The belt-shaped yoke core pieces 11 are wound around the outer periphery of the winding guide G, and the belt-shaped yoke core pieces 11 laminated by a predetermined number of layers are coupled to each other by crimping portions 11c, 11c. A yoke laminate 10 having a predetermined shape as shown in FIG.

  Here, the strip-shaped yoke core piece 11 constituting the yoke laminate 10 has a narrow strip shape as described above, and the connection recesses 11a, 11a,. Therefore, the bending workability is very good, and it becomes possible to form the yoke laminate 10 formed by winding the belt-like yoke core piece 11 in a perfect circle.

  After forming the yoke laminate 10 (see FIG. 2B) in a manufacturing apparatus (not shown), a correction device (not shown) is inserted into the central opening of the yoke laminate 10 as necessary. As shown in FIG. 4, the shape of the yoke laminate 10 is corrected by applying an expanding force Q, Q... To the yoke laminate 10 from the inner diameter side.

  By correcting the shape in this way, the roundness of the yoke laminate 10 can be improved, and the laminated stator core 1 with better shape accuracy can be manufactured.

  On the other hand, as shown in FIG. 5A, a magnetic pole laminate 20 is formed from an electromagnetic steel plate (metal plate) W through processing stations S1 to S3 of a transfer press (not shown).

  That is, the pilot hole P is formed at the processing station S1, the crimping portion 21c is formed at the processing station S2, and then the magnetic pole core piece 21 is removed / caulked and stacked at the processing station S3 to form the magnetic pole stack 20 (FIG. 5 ( b)).

  In addition, it cannot be overemphasized that the manufacturing procedure of the magnetic pole laminated body 20 using a transfer press is not limited to the Example mentioned above, It can set suitably.

  Here, since the magnetic pole laminated body 20 is formed by caulking and laminating the magnetic pole core pieces 21, 21... As described above, the magnetic pole laminated body 20 is manufactured without causing a gap between the laminated magnetic pole core pieces 21. Therefore, the laminated stator core 1 formed by connecting the magnetic pole laminate 20 to the yoke laminate 10 has excellent shape accuracy.

  Further, since the magnetic pole laminate 20 is formed separately from the above-described yoke laminate 10, the yield when the magnetic pole core pieces 21, 21... Are cut from the electromagnetic steel plate (metal plate) W is improved. Therefore, it is possible to avoid an increase in manufacturing cost.

  After the magnetic pole laminate 20 is manufactured as described above, the winding L is wound around the magnetic pole laminate 20 using a dedicated device (not shown) as shown in FIG. In addition to winding the winding L directly around the magnetic pole laminate 20, a bobbin (not shown) around which the winding L is wound may be attached to the magnetic pole laminate 20 in a separate process. Needless to say.

  Here, when winding the winding L around the magnetic pole laminate 20, the magnetic pole laminate 20 is separated from the yoke laminate 10, so that the winding operation of the winding L around the magnetic pole laminate 20 is extremely easy. As a result, the winding L is wound with high density and good proportion.

  After the winding L has been wound around the predetermined number of magnetic pole stacks 20, the connecting protrusions 20a of the magnetic pole stack 20 are arranged in the axial direction of the yoke stack 10 with respect to the connecting recesses 10a of the yoke stack 10. The yoke laminate 10 and the pole laminate 20 are connected and fixed to each other.

  As described above, the coupling convex portion 21a of the magnetic pole laminate 20 is fitted into the coupling concave portion 11a of the yoke laminate 10, and the yoke laminate 10 and the magnetic pole laminate 20 are coupled and fixed to each other, whereby a laminated stator having a predetermined shape is obtained. As the iron core 1 is manufactured, the stator of the motor in which the winding L is wound around the magnetic pole laminates 20, 20... Of the laminated stator iron core 1 is completed.

  Incidentally, the connecting concave portion 11a of the yoke laminate 10 has a substantially rectangular shape as shown in FIG. 7 (a) before the strip-shaped yoke core piece 11 is wound. After the yoke laminate 10 is formed, the opening width on the inner diameter side becomes narrower as shown in FIG. 7B, so that the connecting convex portion 21a of the magnetic pole laminate 20 is tight with respect to the connecting concave portion 11a. The yoke laminate 10 and the magnetic pole laminate 20 are firmly connected and fixed.

  As described above, according to the method for manufacturing a laminated stator core according to the first invention, it is possible to produce a laminated stator core 1 having excellent shape accuracy and electrical characteristics.

  FIG. 8 shows another embodiment of the laminated stator core manufactured according to the first invention. The laminated stator core 1 is connected to the connecting concave portion 11a of the yoke laminate 10 in the magnetic pole laminate 20. Are connected to the yoke laminate 10 and the magnetic pole laminate 20, and fitting fixing portions 30, 30... Are pressed around the connection recess 11a.

  By pressing and forming the fitting and fixing part 30, the periphery of the connection concave part 11a is slightly deformed, and the connection convex part 21a of the magnetic pole laminate 20 is tightened, so that the yoke laminate 10 and the magnetic pole laminate 20 are strengthened. Will be linked.

  Here, the structure of the laminated stator core 1 described above is the same as that of the laminated stator core 1 shown in FIGS. 1 to 7 except that the fitting fixed portions 30, 30... There is no change. In FIG. 8, the winding L (see FIG. 6) wound around each magnetic pole laminate 20 is omitted.

  According to the manufacturing method of the laminated stator core as described above, the coupling strength between the yoke laminate 10 and the magnetic pole laminate 20 is greatly increased by press-fitting the fitting fixing portions 30, 30. It is possible to manufacture the laminated stator core 1 improved to the above.

  In addition, the site | part which press-forms the fitting fixing | fixed part 30,30 ... is not limited only to the circumference | surroundings of the connection recessed part 11a shown in the Example, The periphery of the connection convex part 21a in the magnetic pole laminated body 20, Furthermore, Of course, both the periphery of the connecting recess 11a and the periphery of the connecting protrusion 21a may be pressed.

  FIG. 9 shows another embodiment of the laminated stator core manufactured according to the first invention. In the magnetic pole laminate 20 ′ shown in FIG. Tapered portions 21t 'and 21t' are formed on the side surfaces, and the connecting convex portion 21a 'has a tapered shape with a wide tip (reverse taper). In the magnetic pole laminate 20 "shown in FIG. Further, minute projections 21p "and 21p" are formed on the side surface of the connecting convex portion 21a ".

  The magnetic pole laminate 20 ′ is firmly connected and fixed to the yoke laminate 10 by fitting the connecting convex portion 21 a ′ of the magnetic pole laminate 20 ′ into the joint concave portion 11 a of the yoke laminate 10. Similarly, the magnetic pole laminate 20 ″ is firmly connected and fixed to the yoke laminate 10 by fitting the connecting convex portion 21 a ″ of the magnetic pole laminate 20 ″ into the connecting recess 11 a of the yoke laminate 10. It becomes.

  10 and 11 show a method for manufacturing a laminated stator core according to the second invention. The manufacturing method according to the present invention is the same as the manufacturing method according to the first invention described with reference to FIGS. 1 to 9 except that the details of the steps related to the formation of the yoke laminate 10 ′ are different as described later. There is no fundamental change, and the laminated stator core manufactured according to the present invention is also different from the laminated stator core shown in FIGS. There is basically no difference from 1.

In the method for manufacturing a laminated stator core according to the second invention, first, as shown in FIG. 10 (a), a strip-like yoke core piece 11 'is formed by stamping from an electromagnetic steel plate (metal plate) not shown.
The strip-shaped yoke core piece 11 ′ has a shape in which the yoke of the laminated stator core that is a finished product is linearly developed, specifically, a narrow strip shape that extends straight, Caulking portions 11c ′, 11c ′,... Are arranged at a predetermined pitch.

  Further, when the strip-shaped yoke iron core piece 11 'is wound in the subsequent process, the yoke laminated body 10' (see FIG. 11 (b)). .. Are formed in a predetermined pitch at a portion constituting the inner peripheral surface of the inner peripheral surface. Incidentally, the shape of the strip-shaped yoke core piece 11 ′ is not different from the strip-shaped yoke core piece 11 described with reference to FIG.

  After the strip-shaped yoke core piece 11 'is formed by punching from an electromagnetic steel plate (metal plate), the strip-shaped yoke core piece 11' is carried into a manufacturing apparatus (not shown), and the strip-shaped yoke core piece as shown in FIG. 10 (b). After the outer peripheral equivalent side edge 11o 'of 11' is locally pressed and extended in the longitudinal direction, the above-mentioned belt-like yoke core pieces 11 'are spirally wound and laminated together, and the yoke lamination is performed by caulking together. A body 10 '(see FIG. 11 (b)) is formed.

  Specifically, one end of the strip-shaped yoke iron core piece 11 ′ is locked to the winding guide G of the manufacturing apparatus, and the strip-shaped yoke iron core piece 11 ′ is carried into the winding guide G as indicated by an arrow F, as indicated by an arrow R. By winding the strip-shaped yoke core piece 11 ′ around the outer periphery of the rotating winding guide G, the strip-shaped yoke core piece 11 ′ is bent.

  At this time, before winding the winding guide G and bending the strip-shaped yoke core piece 11 ', as shown in FIG. 10 (b), the thin portion 11p is formed on the outer peripheral equivalent side edge 11o' of the strip-shaped yoke core piece 11 '. By pressing the ′, the outer peripheral equivalent side edge 11o ′ is locally pressed and spread in the longitudinal direction. The thin-walled portion 11p 'is pressed and formed at a predetermined pitch on the outer peripheral equivalent side edge 11o' as the belt-shaped yoke core piece 11 'is conveyed.

  As described above, after the thin-walled portion 11p ′ is pressed and formed on the side edge 11o ′ corresponding to the outer periphery of the strip-shaped yoke core piece 11 ′, the strip-shaped yoke core piece 11 ′ is wound around the outer periphery of the rotating winding guide G, Are bonded together by caulking portions 11c ', 11c' ... (caulking laminating) to produce a yoke laminated body 10 'having a predetermined shape as shown in FIG. 11 (b). Is done.

  Here, the strip-shaped yoke iron core piece 11 'constituting the yoke laminate 10' has a narrow strip shape as described above, and the coupling recesses 11a ', 11a',. Therefore, the bending workability is extremely good, and it becomes possible to form a yoke laminated body 10 'formed by winding the strip-shaped yoke iron core piece 11' in a perfect circle.

  Further, before the strip-shaped yoke core piece 11 'is spirally wound, the strip-shaped yoke core pieces 11' are locally pressed and extended in the longitudinal direction so as to extend in the longitudinal direction. The piece 11 'can be wound more easily, and the roundness of the yoke laminate 10' formed by winding the strip-like yoke core piece 11 'is further improved, and the shape accuracy of the yoke laminate 10' is improved. Is extremely excellent.

  Furthermore, since the thin-walled portion 11p ′ formed by local pressing exists locally (intermittently) without being continuous, the appearance of the laminated stator core is not deteriorated, and intrusion of dust or the like Long life can be achieved because there is no.

  By connecting and fixing a separately formed magnetic pole laminate (not shown) to the yoke laminate 10 'formed as described above, similarly to the method of manufacturing the laminated stator core according to the first invention. Thus, a laminated stator core having a predetermined shape is manufactured.

  Thus, according to the manufacturing method of the laminated stator core related to the second invention, the laminated fixing excellent in both shape accuracy and electrical characteristics as in the manufacturing method of the laminated stator core related to the first invention described in detail above. It becomes possible to manufacture a child iron core.

  In each of the above-described embodiments, a laminated stator core composed of a yoke laminated body having a ring shape and 12 magnetic pole laminated bodies is illustrated, but the present invention is limited to the production of the laminated stator core described above. Of course, the present invention can be effectively applied as a method of manufacturing laminated stator cores having various configurations.

(a) And (b) is the whole top view and whole side view which show one Example of the lamination | stacking stator core manufactured by applying the method in connection with 1st invention. (a) And (b) is an external appearance perspective view of the magnetic pole laminated body and yoke laminated body which comprise the laminated stator core shown in FIG. (a) And (b) is a conceptual diagram which shows the manufacturing procedure of the yoke laminated body in the lamination | stacking stator core shown in FIG. The conceptual diagram which shows the manufacturing procedure of the yoke laminated body in the lamination | stacking stator core shown in FIG. (a), (b) and (c) are the conceptual diagrams which show the manufacture procedure of the magnetic pole laminated body in the lamination | stacking stator core shown in FIG. (a) And (b) is a conceptual diagram which shows the manufacturing procedure of the lamination | stacking stator core shown in FIG. (a) And (b) is a principal part top view which shows the shape change of the connection recessed part in a yoke laminated body. (a) And (b) is the whole top view and whole side view which show the other Example of the lamination | stacking stator core manufactured based on this invention. (a) And (b) is a whole top view which shows the other Example of the magnetic pole laminated body in the laminated stator core manufactured based on this invention. (a) And (b) is a conceptual diagram which shows the manufacture procedure of the yoke laminated body in the lamination | stacking stator core manufactured by applying the method concerning 2nd invention. (a) And (b) is the XI-XI sectional view taken on the line in FIG. 10, and the whole top view of a yoke laminated body. (a) And (b) is the whole top view and principal part cross-section side view which show the laminated stator core manufactured by the prior art. The conceptual diagram which shows the manufacturing method of the lamination | stacking stator core shown in FIG.

Explanation of symbols

1 ... Laminated stator core,
10 ... Yoke laminate,
11 ... strip-shaped yoke iron core piece,
11i ... Inner circumference equivalent side edge,
11a: Connection recess,
11c ... caulking part,
10 '... Yoke laminate,
11 '... strip-shaped yoke core piece,
11i ′: inner peripheral equivalent side edge,
11a '... Connection concave part,
11o ′: side edge corresponding to inner circumference,
11p '... thin part,
11c '... crimping part,
20 ... magnetic pole laminate,
21 ... Magnetic core pieces,
21a ... connecting convex part,
21c ... crimping part,
21 ′… Magnetic core pieces,
21a '... connecting convex part,
21c '... crimping part,
21t '... taper part,
21 ″… Magnetic core pieces,
21a ″ —the connecting projection,
21c "... crimping part,
21p "... microprotrusions,
L ... Winding,
W: Strip steel plate (metal plate).

Claims (6)

A step of punching and forming a strip-shaped yoke core piece having a shape in which the yoke of the laminated stator core is linearly developed and having a connecting concave portion on a side edge corresponding to the inner periphery from a metal plate;
A step of spirally winding and laminating the strip-shaped yoke core pieces, and caulking together to form a yoke laminate;
A step of punching and forming a magnetic pole core piece having a connecting convex portion at the base end from a metal plate;
A step of laminating a predetermined number of the magnetic core pieces, and caulking together to form a magnetic pole laminate;
A step of connecting the yoke stack and the magnetic pole stack to each other by fitting the connecting convex in the connecting recess after winding the magnetic pole stack;
The manufacturing method of the laminated stator core characterized by comprising. A step of punching and forming a strip-shaped yoke core piece having a shape in which the yoke of the laminated stator core is linearly developed and having a connecting concave portion on a side edge corresponding to the inner periphery from a metal plate;
After the side yoke corresponding to the outer periphery of the strip-shaped yoke core piece is locally pressed and spread in the longitudinal direction, the strip-shaped yoke core pieces are spirally wound and laminated, and are joined together by caulking to form a yoke laminate. Forming, and
A step of punching and forming a magnetic pole core piece having a connecting convex portion at the base end from a metal plate;
A step of laminating a predetermined number of the magnetic core pieces, and caulking together to form a magnetic pole laminate;
A step of connecting the yoke stack and the magnetic pole stack to each other by fitting the connecting convex in the connecting recess after winding the magnetic pole stack;
The manufacturing method of the laminated stator core characterized by comprising. After the step of forming the yoke stack, and before the step of connecting the yoke stack and the magnetic pole stack, the yoke stack is applied by applying an expanding force from the inner diameter side of the yoke stack. The method of manufacturing a laminated stator core according to claim 1 or 2, further comprising a step of correcting the shape of the body. 4. The method of manufacturing a laminated stator core according to claim 1, wherein the connecting convex portion in the magnetic pole laminate has a tapered shape with a wide tip. 5. The method of manufacturing a laminated stator core according to any one of claims 1 to 3, wherein a minute projection is formed on a side portion of the connecting convex portion in the magnetic pole laminate. The fitting fixing part is pressed and formed in at least one of the connecting concave part and the connecting convex part after fitting the connecting convex part of the magnetic pole laminate into the connecting concave part of the yoke laminate. The manufacturing method of the laminated stator core as described in any one of Claims 1-5.

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