JP5495180B2 - Manufacturing method of rotor core for axial gap type rotating electrical machine - Google Patents

Description

  The present invention relates to a method for manufacturing a rotor core for an axial gap type rotating electrical machine.

  An axial gap type rotating electrical machine is a rotating electrical machine including a rotor that is arranged to be rotatable about a rotation axis and a stator that is arranged with a gap in the direction of the rotation axis of the rotor. An axial gap type rotating electrical machine is preferable to rotating electrical machines of other structures in that the structure can be reduced in thickness and the magnetic pole area can be increased to improve the torque density.

  In Patent Document 1 below, as a method of manufacturing a laminated rotor core of an axial gap type rotating electrical machine, a plurality of core sheets having different widths are punched and formed from electromagnetic steel sheets, and the plurality of core sheets are laminated in the radial direction. Discloses that a rotor core having a core end face (magnetic pole face) having a trapezoidal shape is manufactured. By making the core end surface trapezoidal, the space between the cores when a plurality of rotor cores are arranged in a circular shape can be reduced, and the efficiency of the rotating electrical machine can be improved.

JP 2008-278648 A

  However, the conventional method for manufacturing a laminated rotor core can use a plurality of dies with different punching positions for the electromagnetic steel sheet to punch and form a plurality of core sheets having different widths, or change the punching positions. There was no choice but to use a plurality of movable molds, resulting in lower productivity and higher manufacturing costs.

  In addition, since the width of the electromagnetic steel sheet that is cut and discarded by a plurality of fixed molds and movable molds is changed, there is a problem in that the scrap of the electromagnetic steel sheet increases and the yield is poor.

  Further, since the manufactured rotor core has a trapezoidal shape, the acute angle corner portion on the outer peripheral side of the core protrudes outward, and the thickness on the outer peripheral side of the frame surrounding and holding the rotor core is reduced at this protruding portion. There was a difficulty which caused the strength fall.

  The present invention has been made in view of the above-described problems in the conventional method of manufacturing a rotor core for an axial gap type rotating electrical machine, and can improve productivity and manufacture a laminated rotor core at a low cost. It aims at providing the manufacturing method of the rotor core for gap type rotary electric machines.

  Another object of the present invention is to provide a method of manufacturing a rotor core for an axial gap type rotating electrical machine that can manufacture a laminated rotor core having a small protrusion on the outer peripheral side of the core and an outer peripheral shape closer to an arc with a high yield.

The present invention is a method of manufacturing a rotor core for an axial gap type rotating electrical machine, which is formed by laminating a plurality of core sheets obtained by punching electromagnetic steel sheets in the radial direction,
The movable cutting part that can change the punching position with respect to the electromagnetic steel sheet forms the inner parts facing each other of the pair of first core sheet and second core sheet, while the fixed cutting part that fixes the punching position with respect to the electromagnetic steel sheet Punching to form a plurality of pairs of first core sheets and second core sheets with different intervals between the inner portion and the outer portion by forming one core sheet and each outer portion of the second core sheet And a plurality of first core blocks having a first inclined side surface and a second inclined side surface that are obliquely crossed with the sheet surface by laminating a plurality of first core sheets having different intervals obtained by the step and the punching step. Forming a first laminating step;
A plurality of second core sheets having different intervals obtained by the punching step are stacked in the punching order to form a plurality of second core blocks having a first inclined side surface and a second inclined side surface obliquely intersecting the sheet surface. A second stacking step and a core forming step of forming a rotor core by using one of the plurality of first core blocks and the plurality of second core blocks or arranging a plurality of the core blocks;
In the first laminating step, by laminating a plurality of the first core sheets in the order of the interval, the first inclined side surface of one first core block is formed, and the first core block Forming a second inclined side surface,
In the second laminating step, by stacking the second sheet formed by punching in pairs with the first core sheet that forms all or part of the first inclined side surface of the first core block, Forming the first inclined side surface of the second core block, and the second core block formed by punching in pairs with the first core sheet forming all or part of the second inclined side surface of the first core block. By laminating sheets, the second inclined side surface of another second core block is formed.

  Further, the present invention provides the core forming step, wherein two of the plurality of first core blocks and the plurality of second core blocks are separated from each other by the first inclined side surfaces, and in the circumferential direction. These are arranged in the circumferential direction so that the widths thereof are larger on the outer peripheral side than on the inner peripheral side.

  Further, the present invention provides the core forming step, wherein two of the plurality of first core blocks and the plurality of second core blocks are brought close to each other on the first inclined side surfaces, and in the circumferential direction. These are arranged in the circumferential direction so that the widths thereof are larger on the outer peripheral side than on the inner peripheral side.

  Further, in the first laminating step, the present invention laminates a plurality of first core sheets obtained by the punching step so that the first inclined side surface and the second inclined side surface of the first core block are orthogonal to each other. In the second lamination step, a plurality of second core sheets obtained by the punching step are laminated so that the first inclined side surface and the second inclined side surface of the second core block are orthogonal to each other. .

  Further, the present invention provides a plurality of first core sheets obtained by the punching step so that the first inclined side surface and the second inclined side surface of the first core block are obliquely crossed at an acute angle in the first lamination step. And laminating a plurality of second core sheets obtained by the punching step so that the first inclined side surface and the second inclined side surface of the second core block cross at an acute angle in the second lamination step. It is characterized by doing.

  Further, in the core forming step, the present invention allows two of the plurality of first core blocks and the plurality of second core blocks to approach only one of the first inclined side surfaces, and in the circumferential direction. These are arranged in the circumferential direction so that the widths thereof are larger on the outer peripheral side than on the inner peripheral side.

Further, in the first laminating step, the present invention laminates the first core sheets having the same interval among the plurality of first core sheets obtained by the punching step at both ends in the laminating direction of the first core block. In the second lamination step, the second core sheets having the same interval are laminated among the plurality of second core sheets obtained by the punching step at both ends in the lamination direction of the second core block. It is said.

  According to the method for manufacturing a rotor core for an axial gap type rotating electrical machine according to the present invention, a plurality of first core sheets and a plurality of second core sheets, which form a first core block and a second core block, are formed at different intervals. Can be easily punched and formed by one movable cutting portion that can change the punching position and a fixed cutting portion that fixes the punching position. Therefore, it is not necessary to use many dies with different punching positions or multiple movable dies that can change the punching positions as in the prior art, and productivity can be improved. A laminated rotor core can be manufactured at low cost.

  Further, conventionally, since the width of the electromagnetic steel sheet that is cut and discarded by the movable cutting part changes, the scrap of the electromagnetic steel sheet has increased, but in the present invention, the electromagnetic steel sheet that is cut and discarded by the movable cutting part Since the width can be made constant, the scrap of the electromagnetic steel sheet can be greatly reduced, and the yield can be improved.

  Moreover, according to the manufacturing method of the present invention, the plurality of second core sheets formed by punching in pairs with the plurality of first core sheets forming the first inclined side surface of the first core block. By laminating, the first inclined side surface of one second core block is formed, and a plurality of first core sheets forming the second inclined side surface of the one first core block are respectively paired. Since the second inclined side surfaces of the other second core blocks are formed by laminating a plurality of punched second core sheets, the first inclined side surfaces of the first core block and the second core block are formed. Not only the second inclined side surface can be formed by reciprocating one movable cutting part, this also can reduce the scrap of the electromagnetic steel sheet and improve the yield. .

  In addition, the rotor core manufactured by the manufacturing method according to the present invention has the second inclined side surface formed on the outer peripheral side of the core, so that the corners on the outer peripheral side of the core are outward like the conventional trapezoidal rotor core. There is no difficulty that the protruding portion has a reduced thickness on the outer peripheral side of the frame and causes a decrease in strength. According to the manufacturing method of the present embodiment, it is possible to manufacture a laminated rotor core having a small protrusion on the outer peripheral side of the core and having an outer peripheral shape closer to an arc with a high yield.

  Furthermore, the rotor core manufactured by the manufacturing method according to the present invention has a current generation surface divided into a first core block and a second core block. It is also possible to reduce eddy currents generated when slot harmonic magnetic flux flows through the rotor core.

It is a schematic plan view explaining the punching process of the manufacturing method of the rotor core of this embodiment. It is sectional drawing of each core sheet explaining the lamination process of the manufacturing method of this embodiment. It is a perspective view explaining the lamination process of the manufacturing method of this embodiment. It is a perspective view explaining the core formation process of the manufacturing method of this embodiment. It is a top view explaining the core formation process of the manufacturing method of this embodiment. It is a disassembled perspective view of the rotor using the rotor core manufactured by the manufacturing method of this embodiment. It is a schematic sectional drawing of the axial gap type rotary electric machine using the rotor core manufactured by the manufacturing method of this embodiment. It is a top view of the rotor core of the 1st modification concerning the present invention. It is a top view explaining the core formation process of the 2nd modification concerning the present invention. It is a top view of the rotor core of the 3rd modification concerning the present invention. It is a top view explaining the core formation process of the 4th modification concerning the present invention. It is a top view of the rotor core of the 5th modification concerning the present invention. It is sectional drawing explaining the lamination | stacking process of the 5th modification based on this invention. It is a schematic plan view explaining the punching process of the 6th modification concerning the present invention. It is a perspective view explaining the lamination process of the 6th modification concerning the present invention. It is explanatory drawing of the core formation process of the 6th modification which concerns on this invention, (a) And (b) is a perspective view of the rotor core seen from a respectively different direction. It is a schematic plan view explaining the punching process of the seventh modification according to the present invention. It is a perspective view explaining the lamination process of the 7th modification concerning the present invention. It is explanatory drawing of the core formation process of the 7th modification based on this invention, (a) And (b) is a perspective view of the rotor core seen from a respectively different direction. It is a schematic plan view explaining the punching process of the eighth modification according to the present invention. It is a perspective view explaining the lamination process of the 8th modification concerning the present invention. It is a perspective view explaining the core formation process of the 8th modification concerning the present invention. It is a perspective view of the rotor core of the 9th modification concerning the present invention. It is a perspective view of the rotor core of the 10th modification concerning the present invention.

  The present invention relates to a method for manufacturing a laminated rotor core used in an axial gap type rotating electrical machine. As illustrated in the schematic cross-sectional view of FIG. 7, the axial gap type rotating electrical machine 10 includes a rotor 2 that is rotatably arranged around a rotation shaft 1 (rotation axis A), and a rotation axis direction of the rotor 2. A pair of stators 3 and 3 are provided on both sides with a predetermined gap therebetween.

  Each stator 3 includes a back yoke 3a, a plurality of stator cores 3b fixed to the back yoke 3a, and a coil 3c wound around each stator core 3b. Each stator 3 is fixed to a casing (not shown), and the rotary shaft 1 passes through the casing so as to be rotatable. The casing is not essential.

  The rotor 2 is fixed to the rotary shaft 1 and is disposed around the rotary axis A of the frame 2a and a frame 2a made of a non-magnetic material that can rotate around the rotary axis A. And a pressing member 2c for fixing the plurality of field portions 2b to the frame 2a.

  The field part 2b is composed of a permanent magnet 2d and a pair of rotor cores 20 stacked so as to sandwich the permanent magnet 2d from both sides. Each rotor core 20 is formed by laminating electromagnetic steel plates having lower conductivity than the permanent magnet 2d in the radial direction, preventing demagnetization of the permanent magnet 2d, and reducing eddy current generated in the magnet. The pressing member 2c is made of a ring-shaped nonmagnetic metal divided into an outer periphery and an inner periphery while avoiding the facing of the stator core 3b. The configuration of the axial gap type rotating electrical machine 10 is merely an example, and the stator 3 may be provided only on one side of the rotor 2, or one stator may be provided and the rotor may be provided on both sides thereof. Further, the configuration of the rotor frame and the pressing member can be arbitrarily selected.

  Hereinafter, the manufacturing method of the rotor core for axial gap type rotating electrical machines of this embodiment is demonstrated, referring FIGS.

  First, as shown in FIG. 1, a plurality of pairs of the first core sheet 11 and the second core sheet 12 are formed by punching by performing a punching process on the electromagnetic steel sheet S1. In this punching process, while the strip-shaped electromagnetic steel sheet S1 is intermittently fed by a predetermined distance in the longitudinal direction (feeding direction F), a plurality of punches arranged in the upper die and dies arranged in the lower die are provided. This is carried out using a progressive press machine in which a core sheet having a predetermined shape is punched and formed step by step by a cutting part.

  That is, as shown in FIG. 1 (a), the movable core P1 that can change the punching position with respect to the electromagnetic steel sheet S1 is punched to actuate the inner portion 111 of the first core sheet 11 and the second core sheet facing each other. 12 inner portions 121 are formed simultaneously. Then, after feeding the electromagnetic steel sheet S1 by a fixed distance, the outer cutting portion P2, the upper portion 113 and the lower portion of the first core sheet 11 are operated by punching the fixed cutting portion P2 which fixes the punching position with respect to the electromagnetic steel plate S1. At the same time as forming 114, the outer portion 122, the upper portion 123 and the lower portion 124 of the second core sheet 12 are formed. In the present embodiment, the inner portions (111, 121) are punched and formed symmetrically with the movable cutting portion P1, and the outer portions (112, 122) are stamped and formed symmetrically with the fixed cutting portion P2.

  As shown in FIG. 1B, by reciprocating only the movable cutting portion P1 by a predetermined distance in the width direction of the strip-shaped electromagnetic steel sheet S1 for each punching operation while intermittently feeding the electromagnetic steel sheet S1 as described above. A plurality of first core sheets 11, 11... Having different distances (D 11, D 12, D 13...) Between the inner part 111 and the outer part 112 are formed by punching, and the distances (D 21. A plurality of second core sheets 12, 12... With different D22, D23.

  In the present embodiment, the outer portion 112, the upper portion 113, and the lower portion 114 of the first core sheet 11 are simultaneously formed by the fixed cutting portion P2, but a plurality of these are formed using a plurality of fixed cutting portions. It can also be formed in stages. The same applies to the second core sheet 12. Further, the front-rear relationship of the punching order between the movable cutting part P1 and the fixed cutting part P2 is not questioned.

  Next, as shown in FIG. 2 and FIG. 3, a first core block 21 is formed by stacking a plurality of first core sheets 11, 11... Obtained by the punching process by performing a stacking process. At the same time, the second core block 22 is formed by stacking a plurality of second core sheets 12. Each time the pair of the first core sheet 11 and the second core sheet 12 are punched, the first core block 21 and the second core block 22 are formed by laminating inside the mold.

  That is, as shown in FIG. 2, as a first laminating step, a plurality of first core sheets 11 are laminated in the order of the above-mentioned intervals (D11, D12, D13...) In the punching order while aligning the outer portions 112. Thus, the first core block 21 having the first inclined side surface 211 and the second inclined side surface 212 that are obliquely inclined with respect to the seat surface L at a predetermined angle is formed on the inner side 111 side. Similarly, as the second laminating step, the plurality of second core sheets 12 are laminated in the order of the distances (D21, D22, D23,...) In the punching order while aligning the outer portions 122. The second core block 22 having the first inclined side surface 221 and the second inclined side surface 222 obliquely inclined at a predetermined angle on the inner side 121 side is formed. 2 shows the sheet with a gap between the sheets for convenience of explanation, the sheets are actually stacked without a gap.

  As shown in FIG. 3 (a), the angle at which the first inclined side surface 211 and the second inclined side surface 212 of the first core block 21 obtained by this lamination process obliquely intersect the sheet surface L is movable in the punching process. It can be appropriately set by changing the distance by which the cutting part P1 is moved in the width direction of the electromagnetic steel sheet S1 for each punching operation. The same applies to the second core block 22. In addition, in FIG. 3, although the 1st inclination side surface (211,221) and the 2nd inclination side surface (212,222) are drawn as a plane, it is actually the step shape for every plate | board thickness of an electromagnetic steel plate. The same applies to each modification described later. A vertical side surface 213 orthogonal to the seat surface L is formed on the outer side 112 side of the first core block 21, and a vertical side surface 223 orthogonal to the seat surface L is formed on the outer side 122 side of the second core block 22. Is formed. Here, it is desirable that the angle formed by the first inclined side surfaces (211, 221) and the vertical side surfaces (213, 223) is 180 ÷ Np (degrees) when the number of magnetic poles of the rotor is Np. In the rotor core 20 (see FIG. 5) described later, the first inclined side surface 211 of the first core block 21 and the first inclined side surface 221 of the second core block 22 form 360 ÷ Np (degrees). This is because, when Np pieces are arranged in the circumferential direction, the first inclined side surfaces facing each other adjacent magnetic poles are parallel to each other.

  Moreover, in these lamination processes, as shown in FIG. 2, each of the plurality of first core sheets 11A forming the first inclined side surface 211 of one first core block 21A was punched and formed. By laminating a plurality of second core sheets 12A, a first inclined side surface 221 of one second core block 22A is formed, and a plurality of second inclined side surfaces 212 of this one first core block 21A are formed. The second inclined side surface 222 of the other second core block 22B is formed by stacking a plurality of second core sheets 12B punched and formed in pairs with the first core sheet 11A. Thus, when the plurality of first core blocks 21 (21A) and the plurality of second core blocks 22 (22A, 22B) are continuously formed, they are cut and discarded by the plurality of cutting portions (P1, P2). The width of the electromagnetic steel sheet to be made can be made constant, and the scrap of the electromagnetic steel sheet can be greatly reduced. The first core block 21 and the second core block 22 thus obtained have the same shape.

  In addition, in these lamination | stacking processes, fixation of a some core sheet can be performed using press caulking, varnish impregnation, laser welding, resin mold, or these together, for example. Furthermore, by applying an insulating coating on the surface where the first core block and the second core block are in contact, eddy current loss described later can be reliably reduced.

  Next, as shown in FIG.4 and FIG.5, by performing a core formation process, the 1st core block 21 and the 2nd core block 22 which were obtained by the said lamination process are made into both the 1st inclination side surfaces 211, 221 are separated from each other, and are combined and arranged in the circumferential direction so that the circumferential width W is larger on the outer circumferential side (W2) than on the inner circumferential side (W1). In the present embodiment, the vertical side surface 213 of the first core block 21 and the vertical side surface 223 of the second core block 22 are arranged in contact with each other. Thus, the rotor core 20 of this embodiment is manufactured.

  In the present embodiment, since the first core sheet 11 and the second core sheet 12 are formed in a vertically symmetrical rectangle in the punching step, either the first core block 21 or the second core block 22 is moved up and down. If reversed, the rotor core 20 can be manufactured from the first core block 21 and the second core block 22 having the same shape, and the productivity can be further improved. Of course, the first core block 21 obtained by laminating the first core sheet 11 obtained from one electromagnetic steel plate and the second core block 22 obtained by laminating the second core sheet 12 obtained from another electromagnetic steel plate are combined to form a rotor core. It may be manufactured.

  A plurality of the rotor cores 20 are prepared. As shown in FIG. 6, the rotor cores 20 are arranged together with the permanent magnets 2d in a plurality of substantially fan-shaped holding spaces 2e formed in the frame 2a, and are fixed from above and below by the pressing members 2c. Thus, the rotor 2 for the axial gap type rotating electrical machine is configured.

  The first core block 21 and the second core block 22 can be fixed using, for example, laser welding, an adhesive, a resin mold, or a combination thereof. Moreover, it may be resin-molded together with the permanent magnet 2d, or aluminum die-casted together with the permanent magnet 2d and integrally formed with the frame 2a. Furthermore, it may be fixed by being fitted into the holding space 2e of the frame 2a.

  The number of core sheets laminated to form the first inclined side surfaces (211 and 221) of the first core block 21 and the second core block 22 is the same as that for forming the second inclined side surfaces (212 and 222). It is desirable that it is larger than the number of core sheets to be laminated. Further, when both ends of the second inclined side surfaces (212, 222) are inscribed in a virtual circle centered on the rotation center of the rotor 2, the outer periphery of the frame 2a having a cylindrical shape has a particularly small radial thickness. This is preferable because no part is formed. Further, since the number of core sheets laminated to form the first inclined side surfaces (211, 221) of the first core block 21 and the second core block 22 is large, the outer peripheral side corresponds to the bottom side and the circular arc. In this case, the first inclined side surface (211, 221) has a substantially trapezoidal shape with a hypotenuse, and can have substantially the same shape as the magnet.

  Thus, according to the manufacturing method of the rotor core for axial gap type rotating electrical machines of this embodiment, since rotor core 20 is constituted combining 1st core block 21 and 2nd core block 22, these 1st core blocks A plurality of first core sheets 11 and a plurality of second core sheets 12 that form 21 and the second core block 22 with different intervals are fixed to one movable cutting portion P1 that can change the punching position. The fixed cutting portion P2 can be easily punched and formed. Therefore, it is not necessary to use many dies with different punching positions or multiple movable dies that can change the punching positions as in the prior art, and productivity can be improved. A laminated rotor core can be manufactured at low cost.

  Further, conventionally, since the width of the electromagnetic steel sheet that is cut and discarded by the movable cutting part changes, the scrap of the electromagnetic steel sheet has increased, but in this embodiment, the electromagnetic steel sheet that is cut and discarded by the movable cutting part. Therefore, it is possible to greatly reduce the scrap of the electromagnetic steel sheet and improve the yield.

  Moreover, according to the manufacturing method of the present embodiment, the plurality of second core sheets formed by punching in pairs with the plurality of first core sheets forming the first inclined side surface of the first core block. By laminating, the first inclined side surface of one second core block is formed, and a plurality of first core sheets forming the second inclined side surface of the one first core block are respectively paired. Since the second inclined side surfaces of the other second core blocks are formed by laminating a plurality of punched second core sheets, the first inclined side surfaces of the first core block and the second core block are formed. Not only the second inclined side surface can be formed by reciprocating one movable cutting part, this also can reduce the scrap of the electromagnetic steel sheet and improve the yield. . The first core sheet and the second core sheet may be formed by punching simultaneously from a plurality of rows and one electromagnetic steel sheet, respectively.

  Further, as shown in FIG. 6, the rotor core 20 manufactured by the manufacturing method of the present embodiment has second inclined side surfaces (212, 222) formed on the outer peripheral side of the core. As described above, the corners on the outer peripheral side of the core protrude outward, and there is no difficulty in that the thickness of the outer peripheral side of the frame 2a is reduced at this protruding part and the strength is reduced. That is, according to the manufacturing method of the present embodiment, it is possible to manufacture a laminated rotor core with a small protrusion on the outer peripheral side of the core and an outer peripheral shape closer to an arc.

  Moreover, since the rotor core 20 manufactured by the manufacturing method of the present embodiment is configured by arranging the first core block 21 and the second core block 22 in the circumferential direction, the electromagnetic steel plates (the first ones stacked in the radial direction) The one core sheet 11 and the second core sheet 12) are divided into two in the circumferential direction, and the eddy current loss in the steel sheet surface due to the magnetic flux flowing in the stacking direction can be reduced. Since the current generation surface is divided into the first core block and the second core block, the vortex generated when the magnetic flux generated by the current flowing in the stator winding or the slot harmonic of the stator flows through the rotor core. It is possible to reduce the current.

  Although the manufacturing method of the rotor core for the axial gap type rotating electrical machine of the present embodiment has been described above, the present invention can be implemented in other modified examples.

"First variation"
You may implement this invention like the 1st modification shown in FIG. The first modification is characterized in that the first inclined side surfaces (231, 241) and the second inclined side surfaces (232, 242) of the first core block 23 and the second core block 24 are orthogonal to each other.

  That is, similarly to the above embodiment, by performing a punching process on the electromagnetic steel sheet, a plurality of pairs of the first core sheet 13 and the second core sheet 14 having different intervals between the inner part and the outer part are formed by punching. By performing the lamination process, a plurality of first core sheets 13 are laminated in the punching order to form the first core block 23, and a plurality of second core sheets 14 are laminated in the punching order to form the second core block 24. To do. In the core forming step, the first core block 23 and the second core block 24 are separated from each other by the first inclined side surfaces 231 and 241 and the circumferential width W is larger than the inner peripheral side (W3). The rotor cores 30 are manufactured by combining them so as to be larger on the outer peripheral side (W4) and arranging them in the circumferential direction.

  Similar to the above embodiment, the angle at which the first inclined side surfaces (231, 241) and the second inclined side surfaces (232, 242) of the rotor core 30 are obliquely crossed with the sheet surface L is the punching operation of the movable cutting portion in the punching process. It can be set as appropriate by changing the distance of reciprocal movement in the width direction of the electrical steel sheet every time. In the first modification, the first inclined side surfaces (231, 241) and the second inclined side surfaces (232, 242) are orthogonalized by adjusting the reciprocating distance of the movable cutting portion. The angle between the first inclined side surface (231, 241) and the second inclined side surface (232, 242) is not limited to a right angle and may be an obtuse angle.

"Second modification"
You may implement this invention like the 2nd modification shown in FIG. The second modification is characterized in the way in which the first core block and the second core block are arranged in the core forming step.

  That is, in the core forming step, the first core block 23 and the second core block 24 are brought close to the first inclined side surfaces 231 and 241 and the circumferential width W is set to the inner circumferential side (W5 The rotor cores 31 are manufactured by arranging them so as to be larger on the outer peripheral side (W6) than on the outer circumference. Here, the first inclined side surfaces (231, 241) are brought into contact with each other.

  The rotor core 31 has a vertical side surface (233, 243) orthogonal to the sheet surface L at the circumferential end of the core end surface (magnetic pole surface), and there is no step for each thickness of the electromagnetic steel plate. There is no magnetic flux density in the thickness direction, and iron loss can be reduced. Further, since the direction of the sheet surface L is bent at the center of the magnetic pole and more closely approximates a circular arc, a steel plate surface along the flow of magnetic flux can be realized.

  Moreover, since the first inclined side surfaces (231, 241) and the second inclined side surfaces (232, 242) are perpendicular to each other, the first core block 23 and the second core block 24 are adjacent to each other. 242 form one continuous plane. Therefore, the thickness T on the outer peripheral side of the frame 2a holding the rotor core 31 can be ensured on the outer peripheral side of the rotor, and the strength of the frame 2a can be prevented from being lowered.

`` Third modification ''
You may implement this invention like the 3rd modification shown in FIG. That is, even if the first inclined side surfaces (231, 241) and the second inclined side surfaces (232 ', 242') are obliquely crossed at an acute angle in the first core block 23 'and the second core block 24' of the rotor core 31 '. Good. In this case, in the cross section of the core, the intersection CP1 between the first inclined side surface (231, 241) and the second inclined side surface (232 ′, 242 ′) is defined as the outermost peripheral seat surface L1 and the second inclined side surface (232 ′). 242 ′) on the virtual arc CA inscribed in the sheet surface L1 at the intersection (CP2, CP2), the outer peripheral shape can be made closer to the arc.

`` Fourth modification ''
You may implement this invention like the 4th modification shown in FIG. The fourth modified example is also characterized by the arrangement of the first core block and the second core block in the core forming step.

  That is, in the core forming step, the first core block 23 and the second core block 24 are brought close to only the first inclined side surface 231 of one first core block 23 to the other second core block 24, and The rotor cores 32 are manufactured by arranging them so that the circumferential width W is larger on the outer peripheral side (W8) than on the inner peripheral side (W7). In this modification, the first inclined side surface 231 and the vertical side surface 243 are in contact with each other.

  In this case, as shown in FIG. 11, if the rotor core 32 is disposed so that the vertical side surface 233 of the first core block 23 is positioned on the rotational advance side in the rotor rotation direction R, the magnetic flux density becomes relatively high. Since the sheet surface L can be made to follow the rotor rotation direction on the vertical side surface 233 side of the surface and the flow of magnetic flux on the vertical side surface 233 side can be made to follow each sheet surface L, the magnetic resistance can be reduced. it can.

`` Fifth modification ''
You may implement this invention like the 5th modification shown in FIG. The fifth modification is characterized in that, in the first core block 25 and the second core block 26 of the rotor core 33, the first core sheet 15 and the second core sheet 16 having different intervals are laminated at both ends in the sheet lamination direction. is there. In this modification, the distance D between the first core sheets 15 of the first core block 25 is made larger on the innermost core side (D15) than the outermost core side (D14) in the stacking direction, and the second core block 26, the interval D between the second core sheets 16 is larger on the innermost core side (D25) than on the outermost core side (D24) in the stacking direction.

  In this case, in the laminating step, as shown in FIG. 13, a pair is formed with each of the plurality of first core sheets 15A forming a part of the first inclined side surface 251 (core inner peripheral side) of the first core block 25A. By stacking the plurality of punched second core sheets 16A, a part of the first inclined side surface 261 of one second core block 26A (core inner peripheral side) is formed. Therefore, as shown by the dotted line in FIG. 13, it forms a pair with each of the plurality of first core sheets 15A forming the other part (core outer peripheral side) of the first inclined side surface 251 of one first core block 25A. The plurality of second core sheets 16C punched and formed are not used for forming one second core block 26A, and the yield decreases accordingly. Similarly, a plurality of first core sheets 15C formed by punching in pairs with a plurality of second core sheets 16A forming the core outer peripheral side of the first inclined side surface 261 of one second core block 26A. Is not used to form one first core block 25A. In addition, you may make the space | interval D of the 1st core sheet | seat 15 and the 2nd core sheet | seat 16 smaller in a core innermost periphery side from a core outermost periphery side.

"Sixth Modification"
You may implement this invention like the 6th modification shown in FIGS. The sixth modification is that, in the punching process, concave portions (172, 182) for accommodating the permanent magnet 2f are formed in the inner portions (171, 181) of the first core sheet 17 and the second core sheet 18. There are features.

  That is, as shown in FIG. 14 (a), in the punching process, the movable cutting portion P3 that can change the punching position with respect to the electromagnetic steel sheet S2 is punched and operated, so that the inner portions of the first core sheet 17 and the second core sheet 18 (171, 181) are formed to face each other. Next, after feeding the electromagnetic steel sheet S2 by a certain distance, by operating the one fixed cutting part P4 which fixed the punching position with respect to the electromagnetic steel sheet S2, the recess (172, 182) are formed to face each other. Then, after feeding the electromagnetic steel sheet S2 by a certain distance, the outer portions of the first core sheet 17 and the second core sheet 18 are operated by punching another fixed cutting portion P5 that fixes the punching position with respect to the electromagnetic steel sheet S2. (173, 183), upper part (174, 184), and lower part (175, 185) are formed.

  Thus, as shown in FIG. 14 (b), a plurality of substantially U-shaped first core sheets 17, 17... With different distances (D16, D17, D18...) Between the inner part 171 and the outer part 173 are formed by punching. At the same time, a plurality of substantially U-shaped second core sheets 18, 18... With different intervals (D 26, D 27, D 28. And the recessed part (172, 182) opened to the inner side is formed in each inner part (171, 181) of the first core sheet 17 and the second core sheet 18.

  Next, as shown in FIG. 15, in the first stacking step, the plurality of first core sheets 17 are stacked in the order of the above-mentioned intervals (D16, D17, D18...) In the punching order while aligning the outer portions 173. Thus, the first core block 27 having the first inclined side surface 271 and the second inclined side surface 272 obliquely intersecting the sheet surface L at a predetermined angle on the inner portion 171 side is formed. In this case, the plurality of second core sheets 18 are obliquely crossed at a predetermined angle with respect to the sheet surface L by laminating the plurality of second core sheets 18 in the order of the distances (D26, D27, D28. The second core block 28 having the first inclined side surface 281 and the second inclined side surface 282 on the inner side 181 side is formed.

  Also in these lamination processes, a plurality of second cores formed by punching in pairs with a plurality of first core sheets 17 forming the first inclined side surface 271 of one first core block 27 as in the above embodiment. By laminating the core sheets 18, a first inclined side surface 281 of one second core block 28 is formed, and a plurality of first cores forming a second inclined side surface 272 of the one first core block 27 are formed. The second inclined side surfaces 282 of the other second core blocks 28 are formed by laminating a plurality of second core sheets 18 formed by punching in pairs with the sheets 17.

  A vertical side surface 273 orthogonal to the sheet surface L is formed on the outer portion 173 side of the first core block 27 thus obtained, and a plurality of concave portions 172 of each first core sheet 17 are stacked to form a first side. An accommodation recess 274 that opens to the inclined side surface 271 and the second inclined side surface 272 is formed. Similarly, a vertical side surface 283 orthogonal to the sheet surface L is formed on the outer side 183 side of the second core block 28, and a plurality of concave portions 182 of each second core sheet 18 are stacked to form the first side. An accommodation recess 284 that opens to the inclined side surface 281 and the second inclined side surface 282 is formed.

  Next, as shown in FIGS. 16A and 16B, in the core forming step, the first core block 27 and the second core block 28 are brought into contact with each other with the first inclined side surfaces 271 and 281. And the rotor core 34 is manufactured by combining and arranging in the circumferential direction so that the width W of the circumferential direction may become larger on the outer peripheral side (W10) than on the inner peripheral side (W9).

  Since the rotor core 34 has housing recesses (274, 284) formed in the first core block 27 and the second core block 28, the permanent magnet 2f can be housed in these housing recesses (274, 284). . Therefore, the assembly work of the rotor for an axial gap type rotating electrical machine can be further facilitated.

"Seventh Modification"
You may implement this invention like the 7th modification shown in FIGS. The seventh modification is that, in the punching step, recesses (512, 522) for accommodating the permanent magnet 2h are formed in the outer portions (513, 523) of the first core sheet 51 and the second core sheet 52. There are features.

  That is, as shown in FIG. 17 (a), in the punching step, the movable cutting portion P6 that can change the punching position with respect to the electromagnetic steel sheet S3 is punched and operated, so that the inner portions of the first core sheet 51 and the second core sheet 52 are moved. (511, 521) are formed to face each other. Next, after feeding the electromagnetic steel sheet S3 by a certain distance, the pair of movable cutting parts P7 that can change the punching position with respect to the electromagnetic steel sheet S3 are punched and actuated on the outer side of the inner part (511, 521). 522) are separated from each other. Further, after feeding the electromagnetic steel sheet S3 by a certain distance, the fixed cutting portion P8 that fixes the punching position with respect to the electromagnetic steel sheet S3 is punched and operated, so that the outer portions (513 of the first core sheet 51 and the second core sheet 52). 523), upper part (514, 524), and lower part (515, 525).

  Thus, as shown in FIG. 17 (b), a plurality of substantially U-shaped first core sheets 51, 51,... With different intervals (D51, D52, D53,...) Between the inner part 511 and the outer part 513 are formed by punching. At the same time, a plurality of substantially U-shaped second core sheets 52, 52,... With different intervals (D61, D62, D63,...) Between the inner part 521 and the outer part 523 are punched out. And the recessed part (512,522) opened to the outer side is formed in each outer part (513,523) of the 1st core sheet 51 and the 2nd core sheet 52. FIG.

  Next, as shown in FIG. 18, in the first stacking step, the plurality of first core sheets 51 are stacked in the order of the above-mentioned intervals (D51, D52, D53...) In the punching order while aligning the outer portions 513. In this way, the first core block 61 having the first inclined side surface 611 and the second inclined side surface 612 obliquely intersecting the sheet surface L at a predetermined angle on the inner side 511 side is formed. In this case, a plurality of second core sheets 52 are obliquely crossed at a predetermined angle with respect to the sheet surface L by stacking the outer portions 523 in the punching order in the order of the distances (D61, D62, D63...). A second core block 62 having a first inclined side surface 621 and a second inclined side surface 622 on the inner side 521 side is formed.

  Also in these lamination processes, a plurality of second cores formed by punching in pairs with a plurality of first core sheets 51 forming the first inclined side surface 611 of one first core block 61, as in the above embodiment. By laminating the core sheet 52, the first inclined side surface 621 of the one second core block 62 is formed, and the plurality of first cores forming the second inclined side surface 612 of the one first core block 61 is formed. The second inclined side surfaces 622 of the other second core blocks 62 are formed by laminating a plurality of second core sheets 52 formed by punching in pairs with the sheets 51.

  A vertical side surface 613 orthogonal to the sheet surface L is formed on the outer side 513 side of the first core block 61 obtained in this way, and a plurality of concave portions 512 of each first core sheet 51 are stacked to form a vertical side surface. An accommodation recess 614 that opens to the 613 side is formed. Similarly, on the outer side 523 side of the second core block 62, a vertical side surface 623 orthogonal to the sheet surface L is formed, and a plurality of concave portions 522 of each second core sheet 52 are stacked so that the vertical side surface An accommodation recess 624 opening on the 623 side is formed.

  Next, as shown in FIGS. 19A and 19B, in the core formation step, the first core block 61 and the second core block 62 are separated from each other by the first inclined side surfaces 611 and 621. And the rotor core 35 is manufactured by combining and arranging in the circumferential direction so that the width W of the circumferential direction becomes larger on the outer peripheral side (W12) than on the inner peripheral side (W11). Here, the vertical side surfaces (613, 623) are in contact with each other.

  Since the rotor core 35 has housing recesses (614, 624) formed in the first core block 61 and the second core block 62, the permanent magnet 2h can be housed in the housing recesses (614, 624). . Therefore, the assembly work of the rotor for an axial gap type rotating electrical machine can be further facilitated.

`` Eighth modification ''
You may implement this invention like the 8th modification shown in FIGS. In the eighth modification, convex portions (532, 542) for engaging the step portions of the frame are formed on the inner portions (531, 541) of the first core sheet 53 and the second core sheet 54 in the punching step. Characterized by the points formed.

  That is, as shown in FIG. 20 (a), in the punching process, the movable cutting portion P9 that can change the punching position with respect to the electromagnetic steel sheet S4 is punched to operate the inner portions of the first core sheet 53 and the second core sheet 54. (531, 541) are formed to face each other, and the convex portions (532, 542) are formed point-symmetrically. Then, after feeding the electromagnetic steel sheet S4 by a certain distance, by operating the fixed cutting portion P10 that fixes the punching position with respect to the electromagnetic steel sheet S4, the outer portions (533, 543), upper part (534, 544) and lower part (535, 545).

  Thus, as shown in FIG. 20 (b), a plurality of first core sheets 53, 53, with different distances (D54, D55, D56,...) Between the inner portion 531 and the outer portion 533 are formed by punching and the inner side. A plurality of second core sheets 54, 54,... Having different intervals (D64, D65, D66,...) Between the portion 541 and the outer portion 543 are formed by punching. And the convex part (532, 542) which protruded inside is formed in each inner part (531, 541) of the 1st core sheet 53 and the 2nd core sheet 54. As shown in FIG.

  Next, as shown in FIG. 21, in the first stacking step, the plurality of first core sheets 53 are stacked in the order of the above-mentioned intervals (D54, D55, D56...) In the punching order while aligning the outer portions 533. Thus, the first core block 63 having the first inclined side surface 631 and the second inclined side surface 632 at the predetermined angle with respect to the sheet surface L on the inner side 531 side is formed, and similarly, the second lamination step In this case, a plurality of second core sheets 54 are obliquely crossed at a predetermined angle with respect to the sheet surface L by laminating the plurality of second core sheets 54 in the order of the intervals (D64, D65, D66. A second core block 64 having a first inclined side surface 641 and a second inclined side surface 642 on the inner side 541 side is formed.

  Also in these lamination processes, a plurality of second cores formed by punching in pairs with a plurality of first core sheets 53 forming the first inclined side surface 631 of one first core block 63 as in the above embodiment. By laminating the core sheet 54, a first inclined side surface 641 of one second core block 64 is formed, and a plurality of first cores forming a second inclined side surface 632 of the one first core block 63 are formed. The second inclined side surfaces 642 of the other second core blocks 64 are formed by laminating a plurality of second core sheets 54 formed by punching in pairs with the sheets 53.

  A vertical side surface 633 perpendicular to the sheet surface L is formed on the outer side 533 side of the first core block 63 obtained in this way, and a convex portion 532 of each first core sheet 53 is formed on the inner side 531 side. A plurality of layers are stacked to form an engagement protrusion 634. Similarly, a vertical side surface 643 orthogonal to the sheet surface L is formed on the outer side 543 side of the second core block 64, and a convex portion 542 of each first core sheet 54 is formed on the inner side 541 side. A plurality of layers are stacked to form an engaging protrusion 644.

  Next, as shown in FIG. 22, in the core forming step, the first core block 63 and the second core block 64 are separated from each other by the first inclined side surfaces 631 and 641, and the circumferential width W is set. Are arranged in the circumferential direction in such a way that they are larger on the outer peripheral side (W14) than on the inner peripheral side (W13). Here, the vertical side surfaces (633, 643) are in contact with each other. Thus, the rotor core 36 is manufactured.

  Since the rotor core 36 has engaging protrusions (634, 644) formed on the first core block 63 and the second core block 64, the engaging protrusions (634, 644) are connected to the holding space 2e of the frame 2a. It can be engaged with a step formed on the inner wall. As a result, the distance between the magnetic pole surface of the rotor core 36 and the stator 3 can be further reduced, and the efficiency of the rotating electrical machine can be increased.

"Ninth Modification"
You may implement this invention like the 9th modification shown in FIG. The ninth modification is characterized in that grooves (655, 665) are formed on the magnetic pole surface of the rotor core 37.

  The rotor core 37 separates the first core block 65 and the second core block 66 from the first inclined side surfaces 651 and 661, and the circumferential width is larger on the outer peripheral side than on the inner peripheral side. And are arranged side by side in the circumferential direction. Here, the vertical side surfaces (653, 663) are in contact with each other. The first core block 65 and the second core block 66 are formed by laminating a first core sheet 55 and a second core sheet 56 each having a recess (555, 565) on the upper side or the lower side. Yes. In this modification, the recesses (555, 565) of the first core sheet 55 and the second core sheet 56 are formed using the fixed cutting part, but may be formed using a movable cutting part.

  Since the rotor core 37 has grooves (655, 665) formed on the magnetic pole surface, the grooves (655, 665) can be used as auxiliary grooves for preventing cogging.

  In the “eighth modified example”, as shown in FIG. 22, the first core block 63 and the second core block 64 are arranged so that the first inclined side surfaces 631 and 641 thereof are separated from each other. However, the first inclined side surfaces 631 and 641 may be brought close to each other, and the engaging protrusions (634 and 644) may be brought into contact with each other. At this time, the groove formed on the magnetic pole surface by the engagement protrusions (634, 644) can be used as an auxiliary groove for preventing cogging.

"Tenth Modification"
The present invention may be implemented as a tenth modification shown in FIG. The tenth modification is characterized in that slope portions (675, 685) are formed on the magnetic pole surface of the rotor core 38.

  In the rotor core 38, the first core block 67 and the second core block 68 are separated from each other by the first inclined side surfaces 671 and 681, and the width in the circumferential direction is larger on the outer peripheral side than on the inner peripheral side. And are arranged side by side in the circumferential direction. Here, the vertical side surfaces (673, 683) are in contact with each other. The first core block 67 and the second core block 68 are formed by laminating a first core sheet 57 and a second core sheet 58 each having a hypotenuse (575, 585) on the upper side or the lower side. ing. In this modification, the oblique sides (575, 585) of the first core sheet 57 and the second core sheet 58 are formed using a movable cutting part, but may be formed by a fixed cutting part.

  Since the rotor core 38 has slope portions (675, 685) at the circumferential end of the magnetic pole surface, the distance from the stator can be increased at the circumferential end of the magnetic pole surface, and the air gap magnetic flux density. Can be distributed close to a sine wave, and the induced voltage can be made a sine wave to reduce cogging.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It may be implemented in a form in which any invention specific matter is replaced with another technology within a range where the same action or effect occurs, or the invention specific matter configured integrally may be constituted by a plurality of members. In addition, the invention specific items constituted by a plurality of members may be implemented in an integrated configuration.

  For example, in the embodiment and the modified example, the rotor core is manufactured by arranging two core blocks selected from the plurality of first core blocks and the plurality of second core blocks in the circumferential direction. You may manufacture a rotor core using a block. In the embodiment and the modification, the two core blocks are arranged in contact with each other, but another core block having a rectangular parallelepiped shape in which core sheets are laminated in the radial direction is interposed between the two core blocks. Alternatively, an insulator may be interposed.

  In the above embodiment and the modification, an example in which the magnetic pole surface of the rotor core is a plane is shown. However, a kamaboko type may be used so that the air gap becomes smaller toward the center. Moreover, you may form a pair of up-down symmetrical protrusion part in the inner part or outer side part of a 1st core sheet and a 2nd core sheet.

10: Axial gap type rotating electrical machine 1: Rotating shaft 2: Rotor 20, 30, 31, 31 ', 32, 33, 34, 35, 36, 37, 38: Rotor core 3: Stator S1, S2, S3, S4: Electromagnetic Steel plates P1, P3, P6, P7, P9: movable cutting parts P2, P4, P5, P8, P10: fixed cutting parts 11, 13, 15, 17, 51, 53, 55, 57: first core sheets 111, 171 511, 531: inner portions 112, 173, 513, 533: outer portions D11 to D18, D51 to D56: intervals 12, 14, 16, 18, 52, 54 between the inner portion and the outer portion of the first core sheet, 56, 58: second core sheets 121, 181, 521, 541: inner parts 122, 183, 523, 543: outer parts D21-D28, D61-D66: inner parts and outer parts of the second core sheet Spaces 21, 23, 23 ', 25, 27, 61, 63, 65, 67: first core blocks 211, 231, 251, 271, 611, 631, 651, 671: first inclined side surfaces 212, 232, 232 ', 252, 272, 612, 632: second inclined side surfaces 213, 233, 273, 613, 633, 653, 673: vertical side surfaces 22, 24, 24', 26, 28, 62, 64, 66, 68: first Two-core blocks 221, 241, 261, 281, 621, 641, 661, 681: first inclined side surfaces 222, 242, 242 ′, 262, 282, 622, 642: second inclined side surfaces 223, 243, 283, 623, 643, 663, 683: vertical side surface L: sheet surface

Claims (7)

A method of manufacturing a rotor core for an axial gap type rotating electrical machine, wherein a plurality of core sheets obtained by punching electromagnetic steel sheets are laminated in a radial direction,
The movable cutting part that can change the punching position with respect to the electromagnetic steel sheet forms the inner parts facing each other of the pair of first core sheet and second core sheet, while the fixed cutting part that fixes the punching position with respect to the electromagnetic steel sheet Punching to form a plurality of pairs of first core sheets and second core sheets with different intervals between the inner portion and the outer portion by forming one core sheet and each outer portion of the second core sheet Process,
The plurality of first core sheets having different intervals obtained by the punching step are stacked in the punching order to form a plurality of first core blocks having a first inclined side surface and a second inclined side surface that are oblique to the sheet surface. A first lamination step;
A plurality of second core sheets having different intervals obtained by the punching step are stacked in the punching order to form a plurality of second core blocks having a first inclined side surface and a second inclined side surface obliquely intersecting the sheet surface. A second lamination step;
A core forming step of forming a rotor core by using one of a plurality of the first core blocks and a plurality of the second core blocks or arranging a plurality of the first core blocks;
Have
In the first lamination step,
By laminating a plurality of the first core sheets in the order of the interval, the first inclined side surface of one first core block is formed and the second inclined side surface of the one first core block is formed. ,
In the second lamination step,
By laminating the second sheet formed by punching in pairs with the first core sheet that forms all or part of the first inclined side surface of the first core block, While forming one inclined side surface,
By stacking the second sheet formed by punching in pairs with the first core sheet that forms all or part of the second inclined side surface of the first core block, the second core block Forming two inclined sides,
A manufacturing method of a rotor core for an axial gap type rotating electrical machine characterized by the above. In the core forming step,
Two of the plurality of first core blocks and the plurality of second core blocks have their first inclined side surfaces separated from each other, and the circumferential width is larger on the outer peripheral side than on the inner peripheral side. The method for manufacturing a rotor core for an axial gap type rotating electrical machine according to claim 1, wherein the rotor cores are arranged in the circumferential direction as described above. In the core forming step,
Two of the plurality of first core blocks and the plurality of second core blocks have their first inclined side surfaces close to each other, and the circumferential width is larger on the outer peripheral side than on the inner peripheral side. The method for manufacturing a rotor core for an axial gap type rotating electrical machine according to claim 1, wherein the rotor cores are arranged in the circumferential direction as described above. In the first lamination step,
Laminating a plurality of first core sheets obtained by the punching step so that the first inclined side surface and the second inclined side surface of the first core block are orthogonal to each other,
In the second lamination step,
Laminating a plurality of second core sheets obtained by the punching step so that the first inclined side surface and the second inclined side surface of the second core block are orthogonal to each other,
The manufacturing method of the rotor core for axial gap type rotary electric machines of Claim 3 characterized by the above-mentioned. In the first lamination step,
Laminating a plurality of first core sheets obtained by the punching step so as to obliquely intersect the first inclined side surface and the second inclined side surface of the first core block,
In the second lamination step,
Laminating a plurality of second core sheets obtained by the punching step so as to obliquely intersect the first inclined side surface and the second inclined side surface of the second core block at an acute angle;
The manufacturing method of the rotor core for axial gap type rotary electric machines of Claim 3 characterized by the above-mentioned. In the core forming step,
Two of the plurality of first core blocks and the plurality of second core blocks are made to approach only one of the first inclined side surfaces, and the circumferential width is larger on the outer peripheral side than on the inner peripheral side. The method for manufacturing a rotor core for an axial gap type rotating electrical machine according to claim 1, wherein the rotor cores are arranged in the circumferential direction as described above. In the first lamination step,
Laminating the first core sheets having the same spacing among the plurality of first core sheets obtained by the punching process at both ends in the laminating direction of the first core block,
In the second lamination step,
Laminating the second core sheets having the same interval among the plurality of second core sheets obtained by the punching process at both ends in the stacking direction of the second core block,
The manufacturing method of the rotor core for axial gap type rotary electric machines as described in any one of Claims 1-6 characterized by the above-mentioned.

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