JPH0538105A - Manufacture of laminated iron core for stator of motor, and laminated mold device therefor - Google Patents

Abstract

PURPOSE:To provide a laminated iron core where the inclination of an installation groove is small at approximately equal height, even if one uses an electromagnetic steel plate great in thickness deviation, by performing the divisional formation and assembling of a laminated magnetic pole iron core member and a laminated yoke iron core member continuously by press processing. CONSTITUTION:In case of making a magnetic pole iron piece, which has a total of twelve magnetic iron cores, and a yoke iron core, for the strip 10 of a silicon steel plate, first, eight square holes 13 are made intermittently between magnetic iron cores, and next twelve slots 17 are punched, and then the air gap between a rotor and a stator and four other gaps are punched. And similarly the formation of four gaps are performed at the positions different from the positions of the gap punching between the rotor and the stator and the gaps, and then a dividing line 41 is made between it and the outer yoke iron core piece 40, and first to third magnetic pole iron core pieces are punched in to a lower blanking die. Next, the yoke iron core piece 40 is cut off, and is punched into the lower blanking die, so that upper and lower magnetic iron pieces are bound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated core used for a stator of an electric motor, and in particular, an electric motor composed of laminated magnetic pole core portions separated and laminated, and a laminated yoke iron core portion to which the laminated magnetic pole core portions are mounted. To a method for manufacturing a laminated iron core for a stator and a laminated die device therefor.

[0002]

2. Description of the Related Art Conventionally, a stator core of an electric motor has been formed by laminating and stacking a plurality of stator core pieces obtained by press molding a large number of inner magnetic poles and caulking projections. Since it is inside, winding was difficult, and automation of winding work was also difficult. Therefore, as disclosed in Japanese Patent Publication No. 57-12378, the present applicant has previously attached a stator core to an outer laminated yoke core portion and a laminated magnetic pole that is attached to the laminated yoke core portion and divided into magnetic poles. We have proposed a method for manufacturing a stator of a rotating electric machine that can be separated into parts and automation of windings.

[0003]

However, in the stator of the rotating electric machine proposed in Japanese Patent Publication No. 57-12378, since the inner laminated magnetic pole portions are all disjointed, the laminated magnetic pole portions are arranged at predetermined positions. Therefore, there is a problem that a jig is required to hold it, the coil mounting device becomes complicated, and the manufacturing process becomes complicated. Therefore, the present applicant previously formed a connecting magnetic pole core piece in which the gaps between the divided magnetic pole core pieces were partially connected, and transposing and polymerizing the formed magnetic pole core pieces to partially connect the magnetic pole core pieces to each other. We have proposed a laminated core for a stator of an electric motor, which is provided above and below a divided magnetic pole core to form an integrated laminated magnetic pole core. Therefore, it is difficult to position the upper punch and the rotating lower die, positioning pins are required, and the equipment cost becomes high, and it is easy for accidents such as burrs to occur in the product or the punch to be missing. There was a problem.
Moreover, even if the electromagnetic steel sheets used are manufactured according to the standard, there is a deviation in thickness. Therefore, if sheet-like electromagnetic steel sheets are sequentially pressed and laminated as they are, the laminated iron core has a high level of 1 to 3%. There is a problem in that the mounting groove of the laminated yoke iron core portion may be tilted, which makes it difficult to mount the laminated magnetic pole portion. The present invention has been made in view of the above circumstances, and each laminated magnetic pole can be held at a predetermined interval without requiring a jig, and winding and pressing work can be easily performed. A method of manufacturing a laminated core for a stator of an electric motor and a laminated mold apparatus therefor capable of obtaining a laminated core having a substantially uniform height and having an extremely small inclination of a mounting groove even if an electromagnetic steel sheet having a large deviation of The purpose is to provide.

[0004]

According to the first aspect of the present invention, there is provided a method for manufacturing a laminated core for a stator of an electric motor according to claim 1, wherein magnetic pole core pieces radially arranged from a metal strip and yoke cores for holding them are provided. And forming a predetermined shape of a core piece for a stator having a core piece and sequentially laminating and stacking in a mold by using a caulking protrusion arranged on the core piece, and a laminated magnetic pole core member and a laminated yoke iron core member. A method of manufacturing a laminated core for a stator of an electric motor, the method comprising: a step of laminating and assembling a magnetic pole core piece in a shape having a gap between all the magnetic pole core pieces; And a square hole forming part of a region corresponding to the air gap, which is previously punched intermittently in the previous step, and a square hole forming step, except for at least two gaps between the plurality of magnetic pole core pieces, The gap between the magnetic pole core pieces of A first magnetic pole core piece forming step of punching an air gap so as to leave a connecting portion and forming a first magnetic pole core piece intermittently; and a step of forming at least two gaps formed in the first magnetic pole core piece. A second magnetic pole core piece forming step of punching an air gap so as to form at least two gaps at a position different from the position, and intermittently forming a second magnetic pole core piece; A punching formation of a connected magnetic pole core portion by sequentially superimposing two magnetic pole core pieces, and a third magnetic pole core piece divided on the connected magnetic pole core portion are sequentially superposed to form a main gap having gaps between all magnetic poles. Forming the punched laminated body of the magnetic pole portion, and further laminating and stacking the first magnetic pole core piece and the second magnetic pole core piece on the main magnetic pole portion in sequence, and integrating the divided main magnetic pole portion To form a laminated core member Laminating and assembling process of the pole core member, and laminating and assembling process of the laminated yoke core member to form the laminated yoke core member by sequentially transposing and polymerizing the yoke core pieces having the mounting grooves into which the laminated magnetic pole core members are press-fitted The laminated magnetic pole core member and the laminated yoke core member are separately assembled and formed by press working.

According to a second aspect of the present invention, there is provided a laminated die device for a laminated iron core for a stator of an electric motor, comprising: a magnetic pole iron core portion radially arranged from a metal strip; and a yoke iron core portion holding the magnetic pole iron core portion. A stacking assembly for forming a laminated core member and a laminated yoke core member by punching and forming means for forming a required shape of a stator core piece having the above and a caulking projection arranged on the core piece. In a die device for manufacturing a laminated core for a stator of an electric motor, which is provided with a processing means, a predetermined square hole is formed in advance so as to form a square hole in a part of a region corresponding to the gap between the magnetic pole core pieces and the air gap. Between a slide plate that includes a punch and a die and that intermittently operates the square hole punch, a square hole forming unit that includes a drive unit that operates the plate, and between the stator and the rotor. Air gap that forms a gap in A first air gap forming punch having at least two protrusions equally arranged on the outer periphery of the punch forming punch, a slide cam plate for intermittently operating the punch, and a drive unit for operating the plate. A first magnetic pole core forming means, a second air gap forming punch having at least two protrusions at positions different from the protrusion positions of the first air gap forming punch, and the punch. Second magnetic pole core forming means composed of a slide cam plate that intermittently operates and a drive unit that operates the plate, and an outer circumference so as to separately punch out the first magnetic pole core and the second magnetic pole core. A punch having a split protrusion, a die and a crimping pressurizing function,
Of the magnetic pole core and the second magnetic pole core are sequentially punched and stacked to form a laminated magnetic pole core, and the third magnetic pole core is punched and stacked on the coupled magnetic pole core to form a stacked main magnetic pole portion, and the main magnetic pole portion is formed. , A stacking and assembling means for fixing the connecting cores to each other to form a laminated magnetic pole core member, a punch for sequentially stacking yoke core pieces, a caulking pressurizing mechanism for stacking the die and the core pieces, and eliminating plate thickness deviation. And a transposing / assembling means for punching and stacking the yoke core pieces to form a laminated yoke core member, and the laminated magnetic pole core member and the laminated yoke core member in a mold. It is configured to be divided and assembled.

[0006]

According to the first aspect of the present invention, there is provided a method of manufacturing a laminated core for a stator of an electric motor, wherein a rectangular hole forming a part of a region corresponding to the gap is punched intermittently in a previous step. Forming step and punching the air gap so as to leave at least two gaps between the plurality of magnetic pole core pieces, leaving a connecting portion that closes the gap between other magnetic pole core pieces, and intermittently disposing the first magnetic pole core pieces. A first magnetic pole core piece forming step, and at least 2 formed on the first magnetic pole core piece
The second magnetic pole core piece forming step of punching out the air gap and forming the second magnetic pole core piece intermittently so as to form at least two gaps at positions different from the positions of the two gaps. By alternately operating the steps, the main magnetic pole portion having a gap between all magnetic poles can be punched and formed, and the first magnetic pole core piece and the second magnetic pole core piece are provided above and below the main magnetic pole portion. It is possible to form the laminated magnetic pole core member integrally provided with the coupled magnetic pole core portion, which is obtained by coupling and polymerizing the above with the caulking projection. Then, in assembling the laminated yoke core member, since the yoke core pieces are sequentially transposed and polymerized, even if an electromagnetic steel sheet having a thickness deviation depending on the location is used,
The entire thickness can be integrally formed, and further, the groove for fixing the laminated magnetic pole core member formed inside can be formed straight.

According to a second aspect of the present invention, there is provided a laminated die apparatus for a laminated iron core for a stator of an electric motor, wherein at least two of the air gap forming punches which form a gap between the stator and the rotor are equally arranged. First air gap forming punch having a projection, a slide cam plate for intermittently operating the punch, and a first magnetic pole core forming means configured to have a driving unit for operating the plate, A second air gap forming punch having at least two protrusions at positions different from the protrusion positions provided in the first air gap forming punch, a slide cam plate for intermittently operating the punch, and the plate. Since it has a second magnetic pole core forming means composed of a driving portion that operates,
By operating the drive unit to move the slide cam plate, it is possible to form a magnetic pole iron core piece having a gap between all the magnetic pole iron core pieces, and further, the respective slide cam plates are appropriately formed. By driving, it is possible to form first and second magnetic pole core pieces that form the connecting magnetic pole core portions provided above and below the main magnetic pole portion. The stacking and assembling means is provided with a punch having a split protrusion on the outer periphery so as to punch out the first magnetic pole core and the second magnetic pole core in a divided manner, and has a crimping pressurizing function. The core and the second magnetic pole core are sequentially punched and polymerized to form a laminated layer of the coupled magnetic pole core, and the main magnetic pole portion and the coupling core are fixed to each other to form a laminated magnetic pole core member. Further, the transposing and assembling means for forming the laminated yoke core member is provided with a punch for sequentially laminating the yoke core pieces, a caulking pressurizing mechanism for superimposing the iron core pieces, and a transposition superposition mechanism. The plate thickness deviation of one piece is eliminated, and moreover, the mounting groove provided inside the laminated yoke iron core member also has the effect of becoming linear.

[0008]

EXAMPLES Next, examples embodying the present invention will be described to provide an understanding of the present invention. 1 is a schematic process diagram showing a manufacturing process of a laminated core for a stator of an electric motor according to an embodiment of the present invention, FIG. 2 is a partial plan view of the same, and FIG. 3 is a laminated core for a stator of the electric motor. FIG. 4 is a perspective view showing an assembled state, FIG. 4 is a perspective view of a laminated yoke core member, FIG. 5 is a plan view of a central portion showing an assembled state of a laminated core for a stator of the electric motor, and FIG. 6 is a main cross section of a magnetic pole core forming means. FIG. 7 is a main sectional view of the square hole forming means, and FIG. 8 is a main sectional view of the transposition assembly means.

FIG. 1 shows a strip 10 made of a silicon steel plate which is an example of a metal strip showing a process of forming a magnetic pole core piece and a yoke core piece having a total of 12 magnetic pole cores formed by press molding. In the (A) station, as shown in FIG. 2 (P) and FIG.
Square holes 13 that form eight gaps between the magnetic pole cores are intermittently formed by the die 1 and the lower die 12. Here, 14 is a center hole, 15 is a pilot hole, and 16 is a caulking projection.

Thereafter, twelve slots 17 are punched out by a slot punch (not shown) and then conveyed to the station (B). At the station (B), punching is performed as shown in FIGS. 2 (Q) and 6. An air gap between the rotor and the stator and four gaps are formed by 18 and the lower die 19. And (C)
In the station, as shown in FIGS. 2 (R) and 6, the punch 20 and the lower die 21 similarly remove the air gap between the rotor and the stator and form four gaps at positions different from the positions of the gaps. It is like this.

As shown in FIG. 7, the station (A) is provided with a slide cam plate 24, which is slidably moved by an electromagnet 23, which is an example of a drive source, at the back of the punch 11 and is driven by the electromagnet 23. When the slide cam plate 24 fixes and holds the rear end portion 22 of the rear portion of the punch 11, when the punch 11 is operated to form a predetermined hole in the strip 10 and the electromagnet 23 is not operated, Is constantly urged in the direction A by a spring 25, the base end portion 22 is fitted into the recess 26 of the slide cam plate 24, and the punch 11 is prevented from operating. Incidentally, 27 is a spring for constantly urging the punch 11 upward, 28 is a punch holder, and 29 is a strip holder, and the mechanism shown in FIG. 7 constitutes a square hole forming means.

As shown in FIG. 6, a slide cam plate 31 which is slidably moved by an electromagnet 30 which is an example of a driving source is provided at the back of the punches 18 and 20 of the stations (B) and (C). . The slide cam plate 31 is constantly biased in the C direction by a spring 32, and the slide cam plate 31 has a recess 33,
When the slide cam plate 31 is moved in the D direction by operating the electromagnet 30, the base end portion 35 of the punch 20 is fitted into the recess 34, and the punch 20 does not operate. And the base end 3 of the punch 18
The flat portion of the slide cam plate 31 is brought into contact with 6 and the punch 18 is operated. Also, the electromagnet 3
When 0 is not operated, the slide cam plate 31 is moved in the C direction by the spring 32, the base end portion 36 of the punch 18 is fitted into the recess 33, and the base end portion 35 of the punch 20 is inserted into the slide cam plate 31. The flat portions are brought into contact with each other, the punch 20 is operated, the punch 18 is not operated, and either the punch 18 or 20 can be selectively operated by operating the electromagnet 30. There is. In the figure, 37 is a punch holder, 38 is a strip holder, and the mechanism shown in FIG. 6 constitutes the first and second magnetic pole core forming means.

After that, in the (D) station, a parting line 41 is formed between the yoke 39 and the outer yoke core piece 40 by the punch 39, and first to third magnetic pole core pieces 42, 43, 44 described below are formed. Is drawn into the lower blank die 45 as shown in FIG. The (E) station is an idle station, and the yoke core piece 40 is cut off at the next (F) station and is pulled out to the blank die 45 below. The blank die 45 is provided with a sprocket 46, which is rotated and driven by a chain connected to a motor at a predetermined pitch (30 degrees in this embodiment) and is inserted into the yoke core piece 4.
0 is transposition polymerized. In FIG. 8, reference numeral 47 is a pedestal that moves up and down, 48 is a cylinder for product extrusion, and 49 is a press bolster, and the transposing and assembling means 50 is formed by the above configuration. In addition, the caulking projections (not shown) are provided on the first to third magnetic pole core pieces 42 to 4 respectively.
4, the upper and lower magnetic pole core pieces 42 to 44 are fixed to each other when the magnetic pole core pieces 42 to 44 are drawn into the lower blank die at the (D) station.

Therefore, when forming the first magnetic pole core piece 42 in which each magnetic pole is separated by four gaps and three magnetic poles are connected by the connecting portion 51 as shown in FIG. 3, it is shown in FIG. Thus, the electromagnet 23 is cut and the slide cam plate 24 is moved in the direction A by the spring 25 so that the punch 11 for the square hole of the station (A) is not operated. Then, the electromagnet 30 shown in FIG. 6 is operated to move the slide cam plate 31 in the D direction, and the punch 18 for removing the air gap in the station (B) is operated,
(C) Punch 20 for removing the air gap at the station
Keep it inactive. As a result, the first magnetic pole core piece 42 is formed. Where (B)
In the process, a first air gap forming punch 18 having at least four protrusions arranged evenly on the outer periphery and a slide cam plate 3 for intermittently operating the punch 18
1 and an electromagnet 30 for operating the plate,
Magnetic pole core forming means is formed.

When the second magnetic pole core piece 43 to be mounted on the first magnetic pole core piece 42 is formed, the square hole punch 11 of the (A) station and the air gap removal of the (B) station are formed. The punch 18 is moved so that the slide cam plates 24 and 31 are not operated, and the punch 20 of the (C) station is operated, thereby forming the second magnetic pole core piece 43. In the step (C), the second air gap forming punch 20 having four protrusions at positions different from the protrusion positions provided on the first air gap forming punch 18, and the punch 20 are intermittently operated. A second magnetic pole core forming means is formed by including the slide cam plate 31 and the electromagnet 30 that operates the plate.

Further, when forming the third magnetic pole core piece 44 in which adjacent magnetic poles are separated from each other, the slide cam plate 24 is operated so that the punch 11 of the (A) station and the punch 18 of the (B) station are formed. Drive it to Figure 2 (S)
As shown in (3), the punch for removing the air gap is operated so that the third magnetic pole core piece 44 is formed.

As shown in FIG. 3, the order of forming the first to third magnetic pole core pieces is as follows. First, a connecting magnetic pole core portion 52 consisting of a first magnetic pole core piece 42 and a second magnetic pole core piece 43 is formed. Then, a main magnetic pole portion 53 in which a predetermined number of the third magnetic pole core pieces 44 are superposed and joined, and then a connected magnetic pole core portion 54 in which the first magnetic pole core piece 42 and the second magnetic pole core piece 43 are superposed and joined are formed. Then, by stacking and assembling them arranged in the step (D), each of them is drawn into the lower blank die, and the caulking projections (not shown) are used to make the lower connecting magnetic pole core portion 52, the main magnetic pole portion 53, and The upper connecting magnetic pole core portion 54 is joined to form an integrated laminated magnetic pole core member 55.

In step (D), the remaining punched-out magnetic pole core pieces are the yoke core pieces 40.
(F) Blank die (die) at the bottom after being cut off in the process
Be pulled into. Here, the lower blank die is provided with a transposing mechanism that rotates one pitch when the pulling-out of one yoke core piece 40 is completed. The protrusions are combined to form the laminated yoke iron core member 56.
As a result, even if metal strips having different thicknesses at the peripheral portion and the central portion are used, the overlapped thicknesses are averaged and the mounting groove 57 provided inside is linear, so that FIG.
As shown in, the outer protrusion 58 of the laminated magnetic pole core member 55 can be smoothly fitted. It should be noted that the coil mounted on the laminated magnetic pole core member is not shown in FIG.
The broken line in (1) indicates the inclination of the mounting groove when the laminated yoke core members are laminated without transposition polymerization.

[0019]

As is apparent from the above description, the laminated iron core for a stator of an electric motor and the laminated mold apparatus thereof according to the first and second aspects require a special jig. Instead, the laminated yoke iron core member and the laminated magnetic pole iron core member are separated and assembled integrally, so that the winding work is easy. Further, in the assembly of the inner laminated magnetic pole core member, the first and second magnetic pole core pieces having gaps at different positions are formed to prevent transposition polymerization, which simplifies the mold structure. Thus, the magnetic pole core piece can be accurately formed. Further, in forming the laminated yoke core member, since the respective yoke core pieces are transposed and polymerized and assembled, even if an electromagnetic steel sheet having a large deviation in thickness is used, the height is substantially uniform. However, the inclination of the mounting groove formed inside is extremely small.

[Brief description of drawings]

FIG. 1 is a schematic process drawing showing a manufacturing process of a laminated core for a stator of an electric motor according to an embodiment of the present invention.

FIG. 2 is a partial plan view of the same.

FIG. 3 is a perspective view showing an assembled state of a laminated core for a stator of the electric motor.

FIG. 4 is a perspective view of a laminated yoke iron core member.

FIG. 5 is a plan view of a central portion showing an assembled state of a laminated iron core for a stator of the electric motor.

FIG. 6 is a main sectional view of a magnetic pole core forming means.

FIG. 7 is a main sectional view of a square hole forming means.

FIG. 8 is a main cross-sectional view of transposing and assembling means.

[Explanation of symbols]

10 strips (metal strip) 11 punches 12 dies 13 Square hole 14 Center hole 15 Pilot hole 16 Caulking protrusion 17 slots 18 punch 19 dies 20 punches 21 die 22 Base end 23 Electromagnet 24 slide cam plate 25 springs 26 hollow 27 spring 28 punch holder 29 Strip holder 30 electromagnets 31 Slide cam plate 32 spring 33 hollow 34 hollow 35 base end 36 Base end 37 punch holder 38 Strip holder 39 punch 40 yoke core piece 41 dividing line 42 first magnetic pole piece 43 Second magnetic pole core piece 44 Third magnetic pole core piece 45 blank die 46 sprockets 47 cradle 48 cylinders 49 Press Bolster 50 Transposing assembly means 51 Connection 52 Coupling magnetic pole core 53 Main magnetic pole 54 Connection magnetic pole core 55 Laminated magnetic pole core member 56 Laminated yoke core member 57 mounting groove 58 Outer protrusion

Claims (2)

[Claims] 1. A process for forming a predetermined shape of an iron core piece for a stator, comprising a magnetic pole iron piece radially arranged from a metal strip and a yoke iron core piece for holding them, and for caulking arranged on the iron core piece. Using the protrusions, sequentially stack and polymerize in the mold,
A method of manufacturing a laminated core for a stator of an electric motor, comprising: a laminated assembly step of separately laminating a laminated magnetic pole core member and a laminated yoke core member, the magnetic pole core having a shape in which all gaps are provided between the magnetic pole core pieces. When forming a piece, a square hole forming step of forming a part of a region corresponding to the gap and the air gap in advance by intermittent punching in the previous step, and a space between the large number of magnetic pole pieces A first magnetic pole core piece forming step of punching out an air gap and intermittently forming the first magnetic pole core piece so as to leave a connecting portion that closes the gap between other magnetic pole core pieces except for at least two gaps An air gap is punched out so as to form at least two gaps at positions different from the positions of the at least two gaps formed in the first magnetic pole core piece, and the second magnetic pole core piece is intermittently formed. A second magnetic pole core piece forming step, a punching of a connecting magnetic pole core portion obtained by sequentially superimposing the first magnetic pole core piece and a second magnetic pole core piece, and The magnetic pole core pieces of No. 3 are sequentially polymerized to form a punched laminated body of the main magnetic pole portion having a gap between all the magnetic poles, and further, the first magnetic pole core piece and the second magnetic pole piece are formed on the main magnetic pole portion. Laminating and assembling the laminated magnetic pole core members, in which the divided main magnetic pole parts are integrated to form a laminated core core member, which includes sequentially laminating the magnetic pole core pieces, and mounting by press-fitting the laminated magnetic pole core members on the inner circumference. Laminating and assembling a laminated yoke core member by sequentially transposing and stacking yoke core pieces having grooves to form a laminated yoke core member, and forming a divided assembly of the laminated magnetic pole core member and the laminated yoke core member. Characterized by consistently performing press processing Method for manufacturing a stator laminated core of an electric motor that. 2. A punching means for forming a required shape of an iron core piece for a stator, comprising a magnetic pole iron core portion radially arranged from a metal strip and a yoke iron core portion for holding the magnetic pole iron core portion, and a punching means arranged on the iron core piece. A laminated die apparatus for a laminated core of a stator of an electric motor, comprising a laminated assembly processing means for forming a laminated core member and a laminated yoke core member by performing laminated lamination using caulking projections. A slide plate provided with a predetermined square hole punch and a die so as to form a square hole in a part corresponding to a gap between them and an air gap, and a slide plate which operates the square hole punch intermittently, and the plate. A first structure comprising a square hole forming means having an operating drive unit and at least two protrusions equally arranged on the outer circumference of an air gap forming punch forming a gap between the stator and the rotor. Air Gya Punch forming punch, a slide cam plate that operates the punch intermittently, and a first magnetic pole core forming means that includes a driving unit that operates the plate, and the first air gap forming punch. A second air gap forming punch having at least two protrusions at positions different from the protrusion position provided on the above, a slide cam plate for intermittently operating the punch, and a drive unit for operating the plate. A second magnetic pole core forming means, a punch having a dividing projection on the outer periphery so as to punch out the first magnetic pole core and the second magnetic pole core in a divided manner, a die and a crimping pressurizing function, and the first magnetic pole. An iron core and a second magnetic pole core are sequentially punched and stacked to form a laminated magnetic pole core; a third magnetic pole core is punched and stacked on the coupled magnetic pole core to form a stacked main magnetic pole portion; Communicating Laminating and assembling means for fixing the iron core to each other to form a laminated magnetic pole iron core member, a punch for sequentially laminating the yoke iron core pieces, a caulking pressurizing mechanism for superposing the die and the iron core pieces, and a rolling means for eliminating the plate thickness deviation. A stacking mechanism, and a transposing and assembling means for punching and stacking the yoke core pieces to form a laminated yoke core member. The laminated magnetic pole core member and the laminated yoke core member are separately assembled in a mold. A laminated die device for a laminated iron core for a stator of an electric motor, characterized by being formed.