JP2017216880A - Manufacturing method for laminated iron-core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for laminated iron-core capable of improving an iron core density and reducing generation of eddy currents as many as possible.SOLUTION: The manufacturing method is a manufacturing method for laminated iron-core formed by laminating a plurality of core pieces 10 through a caulked part 23. The laminated iron-core is a stator laminated iron-core 14 and the caulked part 23 is formed at each of a plurality of retaining parts 17, 17a separatable formed on the outside of a yoke part 15. A width of one retaining part 17a in the circumferential direction is different from the width of the other retaining part 17.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method of manufacturing a laminated iron core (referred to as a stator laminated iron core or a rotor laminated iron core), and in particular, reduces residual stress when forming a laminated iron core and reduces eddy currents generated in the laminated iron core. The present invention relates to a method for manufacturing a laminated iron core that reduces and increases the efficiency of a motor.

When forming a laminated core by caulking core pieces (iron core pieces), eddy currents are generated because the upper and lower core pieces are electrically connected at the caulked portion even if the surface of the core piece is insulated. However, there is a problem that power loss of the laminated iron core occurs.
Therefore, Patent Document 1 provides a technique for reducing the generation of eddy currents by providing a plurality of orifices in each core piece, inserting a non-conductive material (for example, resin), and connecting the core pieces in the stacking direction. Has been proposed.

Further, Patent Documents 2 and 3 propose a technique for heating and annealing a laminated iron core, thereby removing distortion and residual stress generated when a core piece is manufactured (for example, press working). It has been proposed.

Special table 2003-529309 gazette Japanese Patent Laid-Open No. 62-56521 Japanese Patent Publication No.7-110115

However, in the technique described in Patent Document 1, the occurrence of eddy current loss is certainly reduced, but in the process of manufacturing the core piece, strain and residual stress remain in the core piece, and even if pressed up and down by a press There is a problem in that a gap is generated between the core pieces and resin leakage or the like is likely to occur.

Therefore, as described in Patent Documents 2 and 3, when the core pieces are annealed, the gap between the core pieces is reduced. However, in the state where only the annealing is performed, swell and deflection remain, and the core density cannot be increased. In addition, when the core pieces are not caulked and laminated, the core pieces are separated, and there is a problem that handling is difficult.

This invention is made | formed in view of this situation, and it aims at providing the manufacturing method of the laminated iron core which raised iron core density and reduced generation | occurrence | production of eddy current as much as possible.

In the method for manufacturing a laminated core according to the first aspect of the present invention, after annealing a laminated core formed by laminating a plurality of core pieces, the laminated iron core is pressed in the laminating direction and fixed by a resin mold. In the method for manufacturing a laminated core to be integrated, the resin mold is performed using the heat of annealing in the process of lowering the temperature after the laminated core is annealed.

A method for manufacturing a laminated core according to a second invention is the method for producing a laminated core according to the first invention, wherein the resin mold is reheated or kept warm after the laminated core is annealed.

A method for manufacturing a laminated core according to a third invention is the method for producing a laminated core according to the first and second inventions, wherein the laminated core is formed by laminating a plurality of block cores in which the core pieces are laminated, It is integrated by the resin mold. In addition, you may perform annealing at the time of manufacturing a block core, or when making a laminated iron core by stacking a block core.

A method for manufacturing a laminated core according to a fourth aspect of the present invention is the method for manufacturing a laminated core according to the third aspect of the present invention, wherein the block cores are laminated with the core pieces interposed through caulking portions.

A method for manufacturing a laminated core according to a fifth invention is the method for producing a laminated core according to the fourth invention, wherein the laminated core is a stator laminated core, and the caulking portion is formed outside the annular yoke portion. Each of the plurality of separable holding portions is formed.

A method for manufacturing a laminated core according to a sixth aspect is the method for producing a laminated core according to the fifth aspect, wherein n holding parts are provided outside the yoke part every (360 degrees / n). .
However, n is an integer of 3 or more.

A method for manufacturing a laminated core according to a seventh aspect is the method for producing a laminated core according to the sixth aspect, wherein the holding portion and the yoke portion are connected to each other through a reduced width portion.

The method for manufacturing a laminated core according to an eighth invention is the method for producing a laminated core according to the third to seventh inventions, wherein the block cores are rolled up in units of the block cores.

A method for manufacturing a laminated core according to a ninth invention is the method for producing a laminated core according to the first to eighth inventions, wherein the resin mold uses all or part of the holes penetrating the laminated core. Has been done.

And the manufacturing method of the laminated core which concerns on 10th invention is a manufacturing method of the laminated core which concerns on 1st, 2nd invention, The said laminated core is a rotor laminated core or a stator laminated iron core.

In the manufacturing method of the laminated core according to the first to tenth inventions, the laminated core is fixed by pressing with a resin mold after being annealed, and thus the laminated core does not require a caulking portion. Therefore, the power loss accompanying eddy current generation can be suppressed. Also, after each core piece is annealed and recrystallized, the resin is sealed in a pressurized state, so there is less resin leakage due to the effects of strain, residual stress, swell, and deflection, and the core density also increases. An excellent laminated iron core.

In particular, the method for manufacturing a laminated core according to the first invention is performed using the heat of annealing in the process of lowering the temperature of the resin mold after the laminated core is annealed, so that the residual heat of annealing can be used, No preheating device is required, and no time is required for preheating. Also, the overall thermal efficiency is improved.

In the method for manufacturing a laminated core according to the second aspect of the invention, since the resin mold is reheated or kept warm after the laminated core is annealed, the laminated core can be sealed with resin at an appropriate temperature.

In the method for manufacturing a laminated core according to the third aspect of the invention, the laminated core is formed by laminating a plurality of block cores in which a plurality of core pieces are laminated and integrated by a resin mold. Become.

In the method for manufacturing a laminated core according to the fourth aspect of the invention, the block cores are laminated through the caulking portions, so that the block cores do not have to be disassembled.

In the laminated core manufacturing method according to the fifth aspect of the invention, the laminated core is a stator laminated core, and the caulking portions are respectively formed on a plurality of detachable holding portions formed outside the annular yoke portion. Therefore, the caulking portion can be eliminated from the laminated iron core, and the generation of eddy current can be reduced more reliably. Moreover, the core piece which comprises a laminated iron core does not fall apart, and it is easy to handle it.

In the method for manufacturing a laminated core according to the sixth aspect of the present invention, n holding parts are provided outside the yoke part every (360 degrees / n), so that the molds forming the core pieces have the same shape. Become.

In the method for manufacturing a laminated core according to the seventh aspect of the invention, since the holding part and the yoke part are connected via the cross-sectionally reduced width part, the holding part can be easily separated and removed.

In the method for manufacturing a laminated core according to the eighth aspect of the present invention, the block cores are transposed for each block core unit, so that the thickness deviation of the core pieces can be eliminated.

In the method for manufacturing a laminated core according to the ninth invention, since the resin mold is performed using all or part of the holes penetrating the laminated core, the connection of the core pieces can be more reliably ensured.

It is process drawing of the manufacturing method of the laminated core which concerns on one embodiment of this invention. (A), (B), (C) is explanatory drawing which shows 1 process of the manufacturing method of the laminated core. It is explanatory drawing of the manufacturing method of the laminated core. It is explanatory drawing of the manufacturing method of the laminated core. (A), (B), (C), (D) is explanatory drawing of the manufacturing method of the laminated core, respectively. (A), (B), (C), (D) is explanatory drawing of the manufacturing method of the laminated core which concerns on other embodiment of this invention, respectively. It is explanatory drawing of the manufacturing method of the laminated iron core which concerns on other embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the method for manufacturing a laminated core according to an embodiment of the present invention is a first method of manufacturing a block core 11 by punching and laminating a core piece 10 having a predetermined shape from a strip-shaped electromagnetic steel sheet. Step (a), a second step (b) in which the block core 11 is put into an annealing furnace and annealing, and a third step (c) in which the annealed block cores 11 are stacked and placed on the carrier 12 (see FIG. 3). And a fourth step (d) in which a predetermined number of block cores 11 placed on the carrier table 12 are conveyed to the mold apparatus 13 (see FIG. 4) and pressed, and through holes (an example of holes) in the block core 11 are provided. A fifth step (e) in which resin sealing (resin molding) is performed and fixed and integrated, and a sixth step in which the stator laminated iron core 14 (an example of a laminated iron core) that has been resin-sealed is taken out from the mold apparatus 13 (F). These will be described in detail below.

In addition, in the following description, since the planar shape of the core piece 10 and the block core 11 is substantially the same, it attaches | subjects and demonstrates in principle the same number.
As shown in FIGS. 2 (A), 2 (B), (C), and FIG. 3, the core piece 10 includes an annular yoke piece 15, a magnetic pole piece 16 that is evenly arranged on the inside thereof, and a yoke piece 15. A plurality of holding pieces 17 and 17a (equal to 4 in this example) are arranged on the outer periphery of each of the holding pieces 17 and 17a. A rotor space 18 that forms a circle (including a polygon close to a circle) is formed inside the plurality of magnetic pole piece portions 16. A magnetic pole tooth piece portion may be provided at the tip of the magnetic pole piece portion 16.

In this embodiment, four holding pieces 17 and 17a are provided, and the width of the three holding pieces 17 in the circumferential direction is w1, but the width of one holding piece 17a is w2 (<w1 ). By this holding piece portion 17a, the angular positions of the core piece 10 and the block core 11 can be detected by a sensor or visual observation.

The holding piece portions 17 and 17 a are arranged at an equal angle (for example, 90 degrees) on the outer periphery of the yoke piece portion 15, and the rectangular caulking formation piece portions 20 and 20 a and the caulking formation piece portions 20 and 20 a are arranged on the yoke piece portion 15. It has cross-section reduced width portions 21 and 21a connected to the outer periphery. A caulking portion 23 is formed at the center of the caulking forming pieces 20 and 20a. The caulking portion 23 is made of a well-known half-cut caulking or V caulking. A plurality of core pieces 10 are connected via the caulking portion 23 to form the block core 11. The caulking portion 23 of the core piece 10 at the end of each block core 11 is preferably a well-known caulking hole, but is not an essential requirement.

The core piece 10 is punched and formed by a punching device (press device), and is caulked and laminated in the final process to form the block core 11. The holding piece portions 17 and 17 a of the core piece 10 laminated by the block cores 11 form holding portions 17 and 17 a of the block core 11 outside the annular yoke portion 15.

Further, on the center line of the magnetic pole piece 16, a circular or square punched hole 10 a is provided at a radial intermediate position of the yoke piece 15 or a radially inner position from the intermediate position. Although a diameter is arbitrary, it selects in the range of 3-10 mm, for example. The hole 10a becomes a resin hole 10b (an example of a hole penetrating the laminated iron core) in the block core 11, and finally fills with resin and serves to connect the core pieces 10 (the first step). ).

One or a plurality of block cores 11 manufactured by a punching apparatus are put in an annealing furnace, and are annealed at a temperature that does not destroy an insulating film of about 700 to 850 ° C. (preferably 750 to 800 ° C.) to remove residual stress. (The second step). As a result, the core piece 10 is somewhat softened, and distortion and the like are removed. A plurality (m, four in this embodiment) of the block cores 11 taken out from the annealing furnace are placed on a single carrier 12 in a stacked state. In this case, the temperature of the block core 11 is preferably about 250 to 300 ° C. (temperature in the process of annealing and lowering the temperature).

The carriage 12 has a rectangular base plate 26 and a guide rod 27 formed at the center of the base plate 26 as shown by a two-dot chain line in FIG. The diameter of the guide rod 27 substantially coincides with the outer shape of the rotor space 18, and the block core 11 can be positioned. Here, in this embodiment, the four block cores 11 are laminated, but may be changed in a range of multiples of the number of holding portions 17. Note that the guide rod is not limited to the rotor space of the block core, and for example, an arbitrary number of guide rods may be installed in the plurality of slot spaces to position the block core.

The first, second, third, and fourth block cores 11 are rotated and arranged every 90 degrees (that is, transposed). In this embodiment, the determination every 90 degrees is determined by confirming that the position of the narrow holding portion 17a is shifted by a predetermined angle (90 degrees in this example) as it goes upward.
The alignment of each block core 11 is performed by confirming that the side portions of the holding portions 17 and 17a are linearly aligned in the upward direction. The holding portions 17 and 17a can be clamped from the circumferential direction with a parallel member (the third step).

Next, before the temperature of the block core 11 is lowered, as shown in FIG. 4, the block core 11 is conveyed to the mold apparatus 13, and the axis and angle are adjusted between the upper and lower resin injection molds 29 and the receiving mold 30. Deploy. The axis is aligned with the center hole 32 of the resin injection mold 29 by aligning the tip of the guide rod 27, and the angle is determined by using a rectangular groove-shaped guide member that guides the rectangular base plate 26 provided in the receiving mold 30. .

As shown in FIGS. 3 and 4, a cylindrical resin pot 33 is formed in the resin injection mold 29 in accordance with the resin hole 10 b, and the plunger 34 pushes out the resin from the resin pot 33, and the runner 35 and the dummy plate 36. The resin hole 10b is filled with the resin through the injection hole 37 provided in the structure. In addition, if a resin pot is arrange | positioned just above an injection hole, a runner can be abbreviate | omitted.
Although the dummy plate 36 can be omitted, the provision of the dummy plate 36 facilitates the resin peeling from the stator laminated core 14. The dummy plate 36 has a diameter larger than that of the core piece 10, has a shaft hole 38 in the center, and is positioned by the guide rod 27. A dummy plate 36 may be disposed on the resin injection side of the stator laminated core 14 in which the block cores 11 are laminated.

In this state, the stator laminated core 14 is pressed together with the dummy plate 36 in the laminating direction by the resin injection mold 29 and the receiving mold 30 (the fourth step). The plunger 34 is moved to inject the resin into the resin hole 10b. Since the stator laminated iron core 14 composed of a plurality of block cores 11 is heated by annealing heat, it is not necessary to preheat the stator laminated iron core prior to resin sealing, and the resin injection mold has no heating mechanism. However, the injected resin (usually a thermosetting resin such as epoxy) is cured and the resin sealing is completed (the fifth step).

After the injected resin is cured, the resin injection mold 29 and the receiving mold 30 are released from pressure, and the stator laminated iron core 14 that is resin-sealed together with the carrier 12 is taken out from the mold apparatus 13 and the dummy plate 36 is removed. remove. Thereby, the laminated iron core with which the core piece 10 was connected with resin is made (the above, 6th process). Next, using the press cutter 39 shown in FIGS. 5A and 5B, the surrounding holding portions 17 and 17 a are separated from the yoke portion 15 at the base portions of the cross-section reduced width portions 21 and 21 a and removed. 5A and 5B, reference numeral 40 denotes an upper cutter, and 41 denotes a lower cutter. Thereby, the stator laminated core 14 is completed.

Note that, as shown in FIG. 5C, a cutout 43 may be provided in the cross-section reduced width portions 21 and 21a so as to cut with a smaller load.
Moreover, the groove | channel can be provided in the cut part of the cross-section width-reduced part 21, 21a, and the burden of the press cutter 39 can also be made small. Furthermore, as shown in FIG. 5D, a dovetail-shaped fitting portion 57 may be formed by pushback, and the holding portion 17 including the fitting portion 57 may be pushed out and removed after resin sealing. .

In the above-described embodiment, the stator laminated iron core 14 is provided with the resin holes 10b and filled with the resin, and the core pieces 10 are connected. 1) As shown in FIG. When the resin is filled in with a constant thickness, 2) When the resin layer is formed with a predetermined thickness inside the slot for forming the magnetic pole part of the laminated core as shown in FIGS. 6B and 6C, 3 6) As shown in FIG. 6D, the present invention is applied even when a resin layer is formed in the air gap part at the tip of the magnetic pole part or when these are combined.

Although the said embodiment demonstrated the stator lamination | stacking iron core 14, this invention is applicable also to the rotor lamination | stacking iron core 45 as shown in FIG. In this case, it is preferable to perform resin sealing using a magnet insertion hole 47 (an example of a hole) in which the permanent magnet 46 is disposed, but a through hole (an example of a hole) that fills resin in other portions. There are a method of forming, a method of covering a part of a laminated core (for example, a magnet insertion hole) with a resin layer and connecting core pieces, etc. (refer to Japanese Patent Laid-Open Nos. 2007-282392 and 2008-54376, etc.) ).

In FIG. 7, 48 is a shaft hole, 49 is a resin pot formed in a resin injection mold, and 50 is a runner. The holding portions 52 having different shapes may be provided around the shaft hole 48 at an equal angle. In this case, if the concave portion 53 is provided inside the shaft hole 48 and the holding portion 52 is provided in the concave portion 53, there is an advantage that the accuracy of the shaft hole 48 is maintained when the holding portion 52 is removed. Reference numeral 55 denotes a caulking portion. Providing the concave portion 53 is also applied to the outer peripheral portion of the stator laminated core.

In the embodiment, generally, n holding portions are provided at an angle of (360 degrees / n) (n is an integer of 3 or more). The rolling angle is (360 degrees / n) × p (p is 1, 2, 3,..., For example).
Moreover, in the said embodiment, although all the resin holes provided in the laminated iron core were resin-sealed, some of them can also be utilized.

The present invention is not limited to the above-described embodiment, and the shape and configuration thereof can be changed without changing the gist of the present invention.
In the above embodiment, the temperature of the laminated core is increased by using the residual heat after annealing, but the residual heat after annealing is not used, and the laminated core cooled after annealing is heated or kept at a suitable temperature by heating means. In this case, the present invention is also applied. Moreover, the residual heat after annealing and the heating by a heating means can also be used together.
Moreover, in the said embodiment, although the block core is transposed, transposition is not an essential requirement.
In the annealing step, the laminated iron core may be subjected to chemical conversion treatment (blueing), or the laminated iron core may be resin-molded.
Furthermore, the present invention can also be applied to a laminated iron core that is divided into a plurality of parts in the circumferential direction.

In this embodiment, the laminated core is annealed at the stage where each block core is manufactured. However, a required number of core pieces are laminated to form a laminated core (that is, not a block core), The present invention is also applied when the laminated core is annealed.

10: core piece, 10a: punching hole, 10b: resin hole, 11: block core, 12: transfer table, 13: molding die device, 14: stator laminated iron core, 15: yoke piece (yoke part), 16 : Magnetic pole piece part, 17, 17a: holding piece part (holding part), 18: rotor space, 20, 20a: caulking forming piece part, 21, 21a: cross-section reduced width part, 23: caulking part, 26: base plate, 27: guide rod, 29: resin injection mold, 30: receiving mold, 32: center hole, 33: resin pot, 34: plunger, 35: runner, 36: dummy plate, 37: injection hole, 38: shaft hole, 39 : Press cutter, 40: Upper cutter, 41: Lower cutter, 43: Notch, 45: Rotor laminated iron core, 46: Permanent magnet, 47: Magnet insertion hole, 48: Shaft hole, 49: Resin pot, 50: Runner , 52: holding part, 53: concave , 55: caulking portion, 57: engaging portion

The present invention relates to a method of manufacturing a laminated iron core (referred to as a stator laminated iron core or a rotor laminated iron core), and in particular, reduces residual stress when forming a laminated iron core and reduces eddy currents generated in the laminated iron core. The present invention relates to a method for manufacturing a laminated iron core that reduces and increases the efficiency of a motor.

When forming a laminated core by caulking core pieces (iron core pieces), eddy currents are generated because the upper and lower core pieces are electrically connected at the caulked portion even if the surface of the core piece is insulated. However, there is a problem that power loss of the laminated iron core occurs.
Therefore, Patent Document 1 provides a technique for reducing the generation of eddy currents by providing a plurality of orifices in each core piece, inserting a non-conductive material (for example, resin), and connecting the core pieces in the stacking direction. Has been proposed.

Further, Patent Documents 2 and 3 propose a technique for heating and annealing a laminated iron core, thereby removing distortion and residual stress generated when a core piece is manufactured (for example, press working). It has been proposed.

Special table 2003-529309 gazette Japanese Patent Laid-Open No. 62-56521 Japanese Patent Publication No.7-110115

However, in the technique described in Patent Document 1, the occurrence of eddy current loss is certainly reduced, but in the process of manufacturing the core piece, strain and residual stress remain in the core piece, and even if pressed up and down by a press There is a problem in that a gap is generated between the core pieces and resin leakage or the like is likely to occur.

Therefore, as described in Patent Documents 2 and 3, when the core pieces are annealed, the gap between the core pieces is reduced. However, in the state where only the annealing is performed, swell and deflection remain, and the core density cannot be increased. In addition, when the core pieces are not caulked and laminated, the core pieces are separated, and there is a problem that handling is difficult.

This invention is made | formed in view of this situation, and it aims at providing the manufacturing method of the laminated iron core which raised iron core density and reduced generation | occurrence | production of eddy current as much as possible.

The method for manufacturing a laminated core according to the first aspect of the present invention is a method for producing a laminated core formed by laminating a plurality of core pieces via caulked portions, wherein the laminated core is a stator laminated core. Te, the caulked portion is formed in a plurality of holding portions can be disconnected formed outside the yoke portion, the circumferential width of the holding portion of the scratch, that is different from the width of the other of said holding portion .

A method for manufacturing a laminated core according to a second aspect of the present invention is a method for producing a laminated core formed by laminating a plurality of core pieces via caulking portions, wherein the laminated core is a rotor laminated core, and has a shaft hole. A concave portion is provided on the inner side, and the caulking portion is formed in a detachable holding portion formed in the concave portion.

A method for manufacturing a laminated core according to a third invention is the method for producing a laminated core according to the first invention, wherein the holding part and the yoke part are connected via a cross-sectionally reduced width part. The part is provided with a notch.

A method for manufacturing a laminated core according to a fourth invention is the method for producing a laminated core according to the first to third inventions, wherein n holding parts are provided on the outer side of the yoke part (360 degrees / n). It has been. However, n is an integer of 3 or more.

In the method for manufacturing a laminated core according to the first invention, the caulking portion is formed on each of the plurality of detachable holding portions formed outside the yoke portion, and the circumferential width of one holding portion is the other. Therefore, the angular position of one holding portion can be detected by a sensor or visual observation.

Since the manufacturing method of the laminated core according to the second invention is provided with a recess inside the shaft hole and the caulking portion is formed in the detachable holding portion formed in the recess, the shaft is removed when the holding portion is removed. The accuracy of the hole is maintained.

In the method for manufacturing a laminated core according to the third aspect of the invention, the holding portion and the yoke portion are connected via the cross-section reduced width portion, and the cross-section reduced width portion is provided with a notch. Can be cut.

In the method for manufacturing a laminated core according to the fourth aspect of the invention, n holding portions are provided outside the yoke portion every (360 degrees / n), so that the molds forming the core pieces have the same shape. Become.

It is process drawing of the manufacturing method of the laminated core which concerns on one embodiment of this invention. (A), (B), (C) is explanatory drawing which shows 1 process of the manufacturing method of the laminated core. It is explanatory drawing of the manufacturing method of the laminated core. It is explanatory drawing of the manufacturing method of the laminated core. (A), (B), (C), (D) is explanatory drawing of the manufacturing method of the laminated core, respectively. (A), (B), (C), (D) is explanatory drawing of the manufacturing method of the laminated core which concerns on other embodiment of this invention, respectively. It is explanatory drawing of the manufacturing method of the laminated iron core which concerns on other embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the method for manufacturing a laminated core according to an embodiment of the present invention is a first method of manufacturing a block core 11 by punching and laminating a core piece 10 having a predetermined shape from a strip-shaped electromagnetic steel sheet. Step (a), a second step (b) in which the block core 11 is put into an annealing furnace and annealing, and a third step (c) in which the annealed block cores 11 are stacked and placed on the carrier 12 (see FIG. 3). And a fourth step (d) in which a predetermined number of block cores 11 placed on the carrier table 12 are conveyed to the mold apparatus 13 (see FIG. 4) and pressed, and through holes (an example of holes) in the block core 11 are provided. A fifth step (e) in which resin sealing (resin molding) is performed and fixed and integrated, and a sixth step in which the stator laminated iron core 14 (an example of a laminated iron core) that has been resin-sealed is taken out from the mold apparatus 13 (F). These will be described in detail below.

In addition, in the following description, since the planar shape of the core piece 10 and the block core 11 is substantially the same, it attaches | subjects and demonstrates in principle the same number.
As shown in FIGS. 2 (A), 2 (B), (C), and FIG. 3, the core piece 10 includes an annular yoke piece 15, a magnetic pole piece 16 that is evenly arranged on the inside thereof, and a yoke piece 15. A plurality of holding pieces 17 and 17a (equal to 4 in this example) are arranged on the outer periphery of each of the holding pieces 17 and 17a. A rotor space 18 that forms a circle (including a polygon close to a circle) is formed inside the plurality of magnetic pole piece portions 16. A magnetic pole tooth piece portion may be provided at the tip of the magnetic pole piece portion 16.

In this embodiment, four holding pieces 17 and 17a are provided, and the width of the three holding pieces 17 in the circumferential direction is w1, but the width of one holding piece 17a is w2 (<w1 ). By this holding piece portion 17a, the angular positions of the core piece 10 and the block core 11 can be detected by a sensor or visual observation.

The holding piece portions 17 and 17 a are arranged at an equal angle (for example, 90 degrees) on the outer periphery of the yoke piece portion 15, and the rectangular caulking formation piece portions 20 and 20 a and the caulking formation piece portions 20 and 20 a are arranged on the yoke piece portion 15. It has cross-section reduced width portions 21 and 21a connected to the outer periphery. A caulking portion 23 is formed at the center of the caulking forming pieces 20 and 20a. The caulking portion 23 is made of a well-known half-cut caulking or V caulking. A plurality of core pieces 10 are connected via the caulking portion 23 to form the block core 11. The caulking portion 23 of the core piece 10 at the end of each block core 11 is preferably a well-known caulking hole, but is not an essential requirement.

The core piece 10 is punched and formed by a punching device (press device), and is caulked and laminated in the final process to form the block core 11. The holding piece portions 17 and 17 a of the core piece 10 laminated by the block cores 11 form holding portions 17 and 17 a of the block core 11 outside the annular yoke portion 15.

Further, on the center line of the magnetic pole piece 16, a circular or square punched hole 10 a is provided at a radial intermediate position of the yoke piece 15 or a radially inner position from the intermediate position. Although a diameter is arbitrary, it selects in the range of 3-10 mm, for example. The hole 10a becomes a resin hole 10b (an example of a hole penetrating the laminated iron core) in the block core 11, and finally fills with resin and serves to connect the core pieces 10 (the first step). ).

One or a plurality of block cores 11 manufactured by a punching apparatus are put in an annealing furnace, and are annealed at a temperature that does not destroy an insulating film of about 700 to 850 ° C. (preferably 750 to 800 ° C.) to remove residual stress. (The second step). As a result, the core piece 10 is somewhat softened, and distortion and the like are removed. A plurality (m, four in this embodiment) of the block cores 11 taken out from the annealing furnace are placed on a single carrier 12 in a stacked state. In this case, the temperature of the block core 11 is preferably about 250 to 300 ° C. (temperature in the process of annealing and lowering the temperature).

The carriage 12 has a rectangular base plate 26 and a guide rod 27 formed at the center of the base plate 26 as shown by a two-dot chain line in FIG. The diameter of the guide rod 27 substantially coincides with the outer shape of the rotor space 18, and the block core 11 can be positioned. Here, in this embodiment, the four block cores 11 are laminated, but may be changed in a range of multiples of the number of holding portions 17. Note that the guide rod is not limited to the rotor space of the block core, and for example, an arbitrary number of guide rods may be installed in the plurality of slot spaces to position the block core.

The first, second, third, and fourth block cores 11 are rotated and arranged every 90 degrees (that is, transposed). In this embodiment, the determination every 90 degrees is determined by confirming that the position of the narrow holding portion 17a is shifted by a predetermined angle (90 degrees in this example) as it goes upward.
The alignment of each block core 11 is performed by confirming that the side portions of the holding portions 17 and 17a are linearly aligned in the upward direction. The holding portions 17 and 17a can be clamped from the circumferential direction with a parallel member (the third step).

Next, before the temperature of the block core 11 is lowered, as shown in FIG. 4, the block core 11 is conveyed to the mold apparatus 13, and the axis and angle are adjusted between the upper and lower resin injection molds 29 and the receiving mold 30. Deploy. The axis is aligned with the center hole 32 of the resin injection mold 29 by aligning the tip of the guide rod 27, and the angle is determined by using a rectangular groove-shaped guide member that guides the rectangular base plate 26 provided in the receiving mold 30. .

As shown in FIGS. 3 and 4, a cylindrical resin pot 33 is formed in the resin injection mold 29 in accordance with the resin hole 10 b, and the plunger 34 pushes out the resin from the resin pot 33, and the runner 35 and the dummy plate 36. The resin hole 10b is filled with the resin through the injection hole 37 provided in the structure. In addition, if a resin pot is arrange | positioned just above an injection hole, a runner can be abbreviate | omitted.
Although the dummy plate 36 can be omitted, the provision of the dummy plate 36 facilitates the resin peeling from the stator laminated core 14. The dummy plate 36 has a diameter larger than that of the core piece 10, has a shaft hole 38 in the center, and is positioned by the guide rod 27. A dummy plate 36 may be disposed on the resin injection side of the stator laminated core 14 in which the block cores 11 are laminated.

In this state, the stator laminated core 14 is pressed together with the dummy plate 36 in the laminating direction by the resin injection mold 29 and the receiving mold 30 (the fourth step). The plunger 34 is moved to inject the resin into the resin hole 10b. Since the stator laminated iron core 14 composed of a plurality of block cores 11 is heated by annealing heat, it is not necessary to preheat the stator laminated iron core prior to resin sealing, and the resin injection mold has no heating mechanism. However, the injected resin (usually a thermosetting resin such as epoxy) is cured and the resin sealing is completed (the fifth step).

After the injected resin is cured, the resin injection mold 29 and the receiving mold 30 are released from pressure, and the stator laminated iron core 14 that is resin-sealed together with the carrier 12 is taken out from the mold apparatus 13 and the dummy plate 36 is removed. remove. Thereby, the laminated iron core with which the core piece 10 was connected with resin is made (the above, 6th process). Next, using the press cutter 39 shown in FIGS. 5A and 5B, the surrounding holding portions 17 and 17 a are separated from the yoke portion 15 at the base portions of the cross-section reduced width portions 21 and 21 a and removed. 5A and 5B, reference numeral 40 denotes an upper cutter, and 41 denotes a lower cutter. Thereby, the stator laminated core 14 is completed.

Note that, as shown in FIG. 5C, a cutout 43 may be provided in the cross-section reduced width portions 21 and 21a so as to cut with a smaller load.
Moreover, the groove | channel can be provided in the cut part of the cross-section width-reduced part 21, 21a, and the burden of the press cutter 39 can also be made small. Furthermore, as shown in FIG. 5D, a dovetail-shaped fitting portion 57 may be formed by pushback, and the holding portion 17 including the fitting portion 57 may be pushed out and removed after resin sealing. .

In the above-described embodiment, the stator laminated iron core 14 is provided with the resin holes 10b and filled with the resin, and the core pieces 10 are connected. 1) As shown in FIG. When the resin is filled in with a constant thickness, 2) When the resin layer is formed with a predetermined thickness inside the slot for forming the magnetic pole part of the laminated core as shown in FIGS. 6B and 6C, 3 6) As shown in FIG. 6D, the present invention is applied even when a resin layer is formed in the air gap part at the tip of the magnetic pole part or when these are combined.

Although the said embodiment demonstrated the stator lamination | stacking iron core 14, this invention is applicable also to the rotor lamination | stacking iron core 45 as shown in FIG. In this case, it is preferable to perform resin sealing using a magnet insertion hole 47 (an example of a hole) in which the permanent magnet 46 is disposed, but a through hole (an example of a hole) that fills resin in other portions. There are a method of forming, a method of covering a part of a laminated core (for example, a magnet insertion hole) with a resin layer and connecting core pieces, etc. (refer to Japanese Patent Laid-Open Nos. 2007-282392 and 2008-54376) ).

In FIG. 7, 48 is a shaft hole, 49 is a resin pot formed in a resin injection mold, and 50 is a runner. The holding portions 52 having different shapes may be provided around the shaft hole 48 at an equal angle. In this case, if the concave portion 53 is provided inside the shaft hole 48 and the holding portion 52 is provided in the concave portion 53, there is an advantage that the accuracy of the shaft hole 48 is maintained when the holding portion 52 is removed. Reference numeral 55 denotes a caulking portion. Providing the concave portion 53 is also applied to the outer peripheral portion of the stator laminated core.

In the embodiment, generally, n holding portions are provided at an angle of (360 degrees / n) (n is an integer of 3 or more). The rolling angle is (360 degrees / n) × p (p is 1, 2, 3,..., For example).
Moreover, in the said embodiment, although all the resin holes provided in the laminated iron core were resin-sealed, some of them can also be utilized.

The present invention is not limited to the above-described embodiment, and the shape and configuration thereof can be changed without changing the gist of the present invention.
In the above embodiment, the temperature of the laminated core is increased by using the residual heat after annealing, but the residual heat after annealing is not used, and the laminated core cooled after annealing is heated or kept at a suitable temperature by heating means. In this case, the present invention is also applied. Moreover, the residual heat after annealing and the heating by a heating means can also be used together.
Moreover, in the said embodiment, although the block core is transposed, transposition is not an essential requirement.
In the annealing step, the laminated iron core may be subjected to chemical conversion treatment (blueing), or the laminated iron core may be resin-molded.
Furthermore, the present invention can also be applied to a laminated iron core that is divided into a plurality of parts in the circumferential direction.

In this embodiment, the laminated core is annealed at the stage where each block core is manufactured. However, a required number of core pieces are laminated to form a laminated core (that is, not a block core), The present invention is also applied when the laminated core is annealed.

10: core piece, 10a: punching hole, 10b: resin hole, 11: block core, 12: transfer table, 13: molding die device, 14: stator laminated iron core, 15: yoke piece (yoke part), 16 : Magnetic pole piece part, 17, 17a: holding piece part (holding part), 18: rotor space, 20, 20a: caulking forming piece part, 21, 21a: cross-section reduced width part, 23: caulking part, 26: base plate, 27: guide rod, 29: resin injection mold, 30: receiving mold, 32: center hole, 33: resin pot, 34: plunger, 35: runner, 36: dummy plate, 37: injection hole, 38: shaft hole, 39 : Press cutter, 40: Upper cutter, 41: Lower cutter, 43: Notch, 45: Rotor laminated iron core, 46: Permanent magnet, 47: Magnet insertion hole, 48: Shaft hole, 49: Resin pot, 50: Runner , 52: holding part, 53: concave , 55: caulking portion, 57: engaging portion

Claims (4)

In the manufacturing method of the laminated iron core formed by laminating a plurality of core pieces via the caulking portion,
The laminated iron core is a stator laminated iron core,
The caulking portion is formed on each of a plurality of separable holding portions formed on the outer side of the yoke portion, and the circumferential width of one of the holding portions is different from the width of the other holding portion. A method for producing a laminated core as a feature. In the manufacturing method of the laminated iron core formed by laminating a plurality of core pieces via the caulking portion,
The laminated iron core is a rotor laminated iron core,
A manufacturing method of a laminated iron core, wherein a concave portion is provided inside a shaft hole, and the caulking portion is formed in a detachable holding portion formed in the concave portion. In the manufacturing method of the laminated iron core of Claim 1,
The holding part and the yoke part are connected via a cross-sectionally reduced width part, and the cut-out part is provided in the cross-sectionally reduced width part. In the manufacturing method of the laminated iron core of any one of Claims 1-3,
The manufacturing method of a laminated core, wherein n holding parts are provided every (360 degrees / n). However, n is an integer of 3 or more.

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