JP2007267493A - Laminated iron core and manufacturing method of laminated iron core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated iron core and a manufacturing method of the laminated iron core capable of manufacturing a laminated iron core having excellent electromagnetic characteristics, reducing a manufacturing cost, has long lifetime and excellent reliability. <P>SOLUTION: This laminated iron core is a laminated iron core 1 which is manufactured by caulking and laminating iron core pieces 10, 20 formed by punching metal thin plates t, u. In this iron core 1, the electromagnetic steel plate-made iron core pieces 10 punched from the electromagnetic steel plate t into a desired shape and having a caulking portion k1 formed thereon, and a low-carbon steel plate-made iron core pieces 20 punched from the low-carbon steel plate u into the same shape as that of the core pieces 10 and having a caulking portion k2 formed thereon are caulked alternately or per predetermined number of pieces and laminated via the caulking portions k1, k2, and are subjected to heat treatment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a laminated core in which core pieces punched from a thin metal plate are squeezed and laminated together, and a method for manufacturing the laminated core.

    A laminated core 100 shown in FIG. 5 is used as a main part of a rotating electrical machine, for example, a motor. 5A and 5B are a top view and a side view of the laminated core 100, respectively, and the winding is omitted.

  Although there are a wide variety of rotating electrical machines, it is desired to increase the efficiency and output, and in order to cope with this, it is considered to manufacture from a magnetic steel sheet with a thin laminated core (for example, a thickness of 0.24 mm or less). Yes. From such a background, it is possible to obtain a laminated core excellent in electromagnetic characteristics by increasing the efficiency and output by punching an iron core piece from a thin electromagnetic steel sheet and manufacturing the laminated core.

  On the other hand, it is important to reduce the production cost of laminated iron cores. However, large rotating electrical machines that output a high driving force have a large material cost due to the large size of the laminated iron core and the need for many core pieces. This is even more so because it becomes high.

  As a technique for reducing the cost, conventionally, there is a technique in which a laminated core of a laminated core is manufactured from a divided stator core piece. This increases the yield of the electromagnetic steel sheet by forming the stator core piece 101, for example, by dividing the yoke part 100y for each magnetic pole part b and punching out the magnetic steel sheet to form a divided stator core piece. Cost reduction is planned.

In addition, there exists the following patent document 1 as literature well-known invention which concerns on this application.
JP-A-8-186958

    By the way, when the laminated core 100 is formed by laminating the divided stator core pieces, the laminated stator core pieces must be laminated, and the laminated divided iron cores must be assembled while paying attention to the assembly accuracy such as roundness and squareness. First, it requires advanced motor assembly technology.

  In addition, some laminated cores composed of laminated cores cannot be fully adapted to their use due to their life in harsh usage environments, etc., and have excellent electromagnetic characteristics and long life while reducing costs. There is a problem of obtaining a laminated iron core.

  In view of the above circumstances, the present invention provides a laminated core and a method for producing a laminated core that can produce a laminated core that has excellent electromagnetic characteristics, can reduce costs, has a long life, and is highly reliable. With the goal.

    In order to achieve the above object, the laminated iron core of claim 1 according to the present invention is a laminated iron core in which core pieces punched from a thin metal plate are squeezed and laminated together, and are punched into a desired shape from a magnetic steel sheet. The magnetic steel plate core pieces in which the caulking portion is formed and the low carbon steel plate core pieces in which the caulking portion is formed while being punched in the same shape as the magnetic steel plate iron core piece from the low carbon steel plate are alternately or predetermined. The sheets are alternately squeezed through the staking section and heat treated.

  The laminated core of claim 2 according to the present invention is the laminated core according to claim 1, wherein the heat treatment of the laminated core is a heat treatment at a temperature equal to or higher than a recrystallization temperature of the iron core piece made of the low carbon steel sheet.

  The laminated core of claim 3 according to the present invention is a method of manufacturing a laminated core in which iron core pieces are punched from a thin metal plate, and the iron core pieces are squeezed and laminated to each other. Punching and forming a crimped part, on the other hand, punching a low-carbon steel sheet core piece of the same shape as the electromagnetic steel sheet core piece from a low carbon thin steel sheet and forming a crimped part, the electromagnetic steel sheet core piece and the The low-carbon steel plate core pieces are alternately squeezed and laminated through the squeezing portions alternately every predetermined number of sheets, and then heat-treated.

  The laminated core of claim 4 according to the present invention is the laminated core manufacturing method according to claim 3, wherein the heat treatment of the laminated core is performed at a temperature equal to or higher than a recrystallization temperature of the iron core piece made of the low carbon steel sheet.

    As described above in detail, according to the laminated iron core related to claim 1 of the present invention and the laminated iron core manufacturing method related to claim 3 of the present invention, the laminated iron core is made of an electromagnetic steel plate and a low carbon steel plate. And the use of expensive electrical steel sheets is reduced, and the cost can be reduced.

  In addition, by heat-treating the laminated laminated core, the low-carbon steel sheet core piece has a permeability, magnetic flux density, and iron loss that are reduced by the permeability, magnetic flux density, and iron loss improvement factor of the magnetic steel sheet core piece. Thus, a laminated core having an electromagnetic characteristic approximate to that of the laminated steel core made up of magnetic steel sheet core pieces is manufactured.

In addition, both the magnetic steel sheet core pieces and the low carbon steel sheet core pieces that make up the laminated iron core are single-piece iron core pieces, so they can be used for a long time in harsh environments compared to the case of using a split core piece. It operates reliably and has a long service life.

  According to the laminated iron core related to claim 2 of the present invention and the laminated iron core manufacturing method related to claim 4 of the present invention, the portion of the low-carbon steel sheet core piece subjected to punching strain is recrystallized or further grown. And the magnetic permeability, magnetic flux density, and iron loss are improved more than the increase in the magnetic permeability, magnetic flux density, and iron loss of the magnetic steel sheet core piece.

  Therefore, a laminated iron core is manufactured that is in no way inferior to the one in which the laminated iron core is composed of magnetic steel sheet core pieces.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  A laminated core 1 manufactured by applying the present invention shown in FIG. 1 is used for a stator of a motor, and includes a large number of magnetic poles 2 wound (not shown) and a current flowing through the winding. A yoke 3 in which a magnetic field by electromagnetic induction is formed, and a crimping portion k used for crimping between the iron core pieces 10 and 20 are provided.

  This laminated iron core 1 includes magnetic steel sheet core pieces 10 (see FIG. 2) and low carbon steel sheet core pieces 20 (see FIG. 2) formed in the same shape as the magnetic steel sheet core pieces 10 alternately or in a predetermined manner. The sheet is manufactured by crimping and laminating with each other via the crimping portions k (k1, k2) alternately, and then performing heat treatment.

  The magnetic steel sheet core piece 10 and the low carbon steel sheet core piece 20 constituting the laminated core 1 are formed by punching a thin steel sheet (metal thin plate) t and a low carbon steel plate (metal thin plate) u, respectively. As shown in FIG. 2, the magnetic pole portions 12 and 22 that form a large number of magnetic poles 2 of the laminated core 1, the yoke portions 13 and 23 that form the yoke 3 of the laminated iron core 1, and the core pieces 10 and 20 The caulking portions k1 and k2 used for fixing the caulking are formed.

  The caulking portions k1 and k2 are not shown in FIG. 3A in the sectional view taken along the line AA in FIG. 2A, but also in the sectional view taken along the line AA in FIG. The v-shaped projection having a v-shaped cross-section formed by projecting the center portion shown in FIG. 3 or the cut-and-raised projection shown in FIG. 3 (c) of the cross-sectional view taken along the line AA in FIG. Selected and formed.

  Next, a method for manufacturing the laminated core 1 having the above configuration will be described.

  As shown in FIG. 4, a press die apparatus (not shown) for manufacturing the laminated core 1 includes an electromagnetic steel sheet core piece forming line L1 for forming an electromagnetic steel sheet core piece 10, and a low carbon steel core. A low-carbon steel core piece feeding line L2 for forming the piece 20 and feeding it to the processing station S5 which is a caulking laminating station is provided. FIG. 4 is a top view showing a process of manufacturing the laminated core 1 using the magnetic steel sheet core piece forming line L1 and the low carbon steel core piece feeding line L2.

  The electromagnetic steel plate core piece 10 is formed by punching a thin strip-shaped electromagnetic steel plate t through a magnetic steel plate core piece forming line L1 intermittently. This magnetic steel sheet iron core piece forming line L1 includes processing stations S1 to S5 for sequentially performing predetermined pressing on the magnetic steel sheet t of the base material that is intermittently conveyed.

  Manufacture of the laminated core 1 using a press die apparatus is performed as follows.

  First, in the processing station S1, the inner diameter n (see FIG. 2 (a)) of the electromagnetic steel sheet iron core piece 10 is punched from the electromagnetic steel sheet t.

  Subsequently, in the processing station S2, a slot s (see FIG. 2A) between the magnetic pole portions 12 in the electromagnetic steel sheet core piece 10 is punched from the electromagnetic steel sheet t.

  Subsequently, in the processing station S3, the crimping portion k1 (see FIGS. 2A and 3) of the magnetic steel sheet iron core piece 10, for example, the half-projection projection, the v-shaped projection, and the caulking projection such as the cut-and-raised projection is formed. Formation takes place. It should be noted that the caulking portions k1 and k2 formed in the first laminated steel sheet core piece 10 or the low carbon steel core piece 20 are punched holes.

  Subsequently, in the processing station S4, an auxiliary pilot hole p1 for punching out the outer shape g of the magnetic steel sheet core piece 10 is formed by punching from the magnetic steel sheet t.

  Subsequently, in the processing station S5 which is a caulking laminating station, the outer shape g of the electromagnetic steel sheet core piece 10 is punched from the electromagnetic steel sheet t.

  On the other hand, in the low carbon steel core piece feeding line L2, the low carbon steel sheet u is lowered from the thin carbon steel sheet u using a processing station similar to the processing stations S1 to S4 of the magnetic steel sheet core piece forming line L1. After forming the carbon steel plate core piece 20 and removing the outer shape, it is pushed back, and the low carbon steel plate core piece 20 and the magnetic steel plate core piece 10 are alternately sent to the processing station S5. The steel core pieces 20 are pulled out and laminated alternately with the magnetic steel sheet core pieces 10, and crimped to each other via the crimped portions k 1 of the magnetic steel sheet core pieces 10 and the crimped portions k 2 of the low carbon steel plate core pieces 20. Join.

  In the above example, the case where the magnetic steel sheet core pieces 10 and the low carbon steel sheet core pieces 20 are alternately laminated one by one is illustrated, but the electromagnetic steel sheet core pieces 10 and the low carbon steel sheet core pieces 20 Alternately for every predetermined number, for example, the magnetic steel sheet core pieces 10 and the low carbon steel sheet core pieces 20 are alternately arranged in the same number, or 2, 4, 2,..., Or 2, 4 Different numbers such as three, five, etc. may be stacked alternately.

  Thus, after manufacturing the laminated core 1 by alternately stacking the magnetic steel sheet core pieces 10 and the low carbon steel sheet core pieces 20 alternately or by a predetermined number of sheets, the low carbon steel sheet core pieces 20 are reused. Heat treatment is performed at a temperature higher than the crystal temperature, for example, 600 ° C. or higher.

  The method of mixing the magnetic steel plate core piece 10 and the low carbon steel plate core piece 20 is not limited to the above-described embodiment. For example, the magnetic steel plate and the low carbon plate steel plate are stacked, and the core piece is punched out by a press die device. It is also possible to carry out by caulking and the like.

  According to the above configuration, the electromagnetic steel sheet core piece 10 obtained by punching the electromagnetic steel sheet core piece 10 from the electromagnetic steel sheet t into a desired shape and forming the crimped portion k1, and the low carbon thin steel sheet u to the electromagnetic steel sheet core piece 10 The laminated core 1 is formed by punching into the same shape and laminating the low-carbon steel sheet core pieces 20 formed with the crimped portion k2 alternately or by a predetermined number of sheets via the crimped portions k1 and k2 and then heat-treating. To do.

  Therefore, the laminated iron core 1 is formed by mixing the magnetic steel sheet iron core piece 10 and the low carbon steel plate iron core piece 20, so that the use of the expensive electromagnetic steel sheet t is reduced and the production cost is reduced.

  Further, since the heat treatment of the laminated laminated core 1 is performed in a temperature range equal to or higher than the recrystallization temperature of the low-carbon steel sheet core piece 20, the location where the low-carbon steel sheet core piece 20 has been subjected to processing distortion due to punching is regenerated. The low-carbon steel plate core piece 20 causes crystal growth and further crystal grain growth, and the permeability, magnetic flux density, and iron loss are improved more than the improvement of the magnetic permeability, magnetic flux density, and iron loss of the magnetic steel plate core piece 10. Thus, the difference between the magnetic steel sheet core piece 10 and the low carbon steel sheet core piece 20 is reduced, and the laminated core 1 having an electromagnetic characteristic approximate to that of the laminated iron core 1 made up of all of the electroblasted steel core pieces 10 is manufactured. The

  Moreover, since both the electromagnetic steel plate core piece 10 and the low carbon steel plate core piece 20 constituting the laminated core 1 are each formed from a single plate, compared to the case where the laminated core pieces are formed using divided core pieces. It operates reliably in long-term use under harsh usage environments and has a long service life.

  Thereby, there exists an effect that the laminated iron core 1 which is not inferior to what comprised the laminated iron core 1 by the electromagnetic steel plate iron core piece 10 is manufactured.

    As an application example of the present invention, the present invention can be applied not only to the manufacture of a stator laminated core of a motor but also to the manufacture of a rotor laminated core, and it can be widely applied to a laminated core having a similar structure in which core pieces are laminated.

The perspective view which shows the laminated iron core in connection with the Example of this invention. (a) And (b) is the top view and side view which show the core piece made from an electromagnetic steel plate and the core piece made from a low carbon steel plate which comprise the laminated core of an Example. (a), (b) and (c) are the sectional views on the AA line of Drawing 2 (a). The top view which shows the process of manufacturing a laminated iron core with an electromagnetic steel plate core piece formation line and a low carbon steel plate core piece feeding line. (a) And (b) is the top view and side view which show the conventional laminated iron core.

Explanation of symbols

1 ... laminated iron core,
10 ... Magnetic steel sheet core pieces,
20 ... low carbon steel core pieces,
k1 ... caulking part of magnetic steel sheet iron core piece,
k2 ... The caulking part of the core piece made of low-carbon steel sheet,
t ... electromagnetic steel sheet (metal sheet),
u: Low carbon steel plate (metal thin plate).

Claims (4)

It is a laminated core in which core pieces punched from a thin metal sheet are crimped together and laminated,
An electromagnetic steel plate core piece that is punched from a magnetic steel sheet into a desired shape and a crimped portion is formed, and a low carbon steel plate that is punched from a low carbon steel plate into the same shape as the magnetic steel plate core piece and is formed with a crimped portion A laminated iron core, wherein the iron core pieces are laminated by being crimped through the caulking portions alternately or every predetermined number of sheets, and heat-treated.
The laminated iron core according to claim 1, wherein the heat treatment of the laminated iron core is a heat treatment at a temperature equal to or higher than a recrystallization temperature of the iron core piece made of the low carbon steel sheet. A method of manufacturing a laminated core in which a core piece is punched from a thin metal plate, and the core pieces are crimped together and laminated,
An electromagnetic steel plate core piece is punched from a magnetic steel sheet into a desired shape and a crimped portion is formed. On the other hand, a low carbon steel plate core piece having the same shape as the electromagnetic steel plate core piece is punched from a low carbon thin steel plate and a crimped portion. Forming the magnetic steel sheet iron core pieces and the low carbon steel sheet iron core pieces alternately or by predetermined number of sheets, and laminating them through the caulking portions, and then heat-treating the laminated iron cores. Production method. The method for producing a laminated core according to claim 3, wherein the heat treatment of the laminated core is performed at a temperature equal to or higher than a recrystallization temperature of the low-carbon steel sheet core piece.

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