JP7094803B2 - Method for manufacturing rotor laminated iron core and rotor laminated iron core - Google Patents

Description

The present disclosure relates to a rotor laminated iron core and a method for manufacturing a rotor laminated iron core.

Patent Document 1 discloses a rotor laminated iron core including a plurality of block bodies. Each block body includes a plurality of magnet insertion holes and a pair of keys. The plurality of magnet insertion holes are offset by a predetermined angle with respect to the facing direction of the pair of keys. Of the plurality of block bodies, the block bodies adjacent to each other in the height direction are laminated so as to be inverted. In this case, the magnetic poles appearing on the peripheral surface of the rotor laminated iron core are displaced in the circumferential direction between the vertically adjacent block bodies. As a result, the effect of skew (reduction of torque ripple, vibration, noise, etc.) of tilting the magnetic pole with respect to the rotating shaft can be obtained.

Japanese Unexamined Patent Publication No. 2005-051896

Usually, the laminated iron core is formed by fastening a plurality of punched members to each other by caulking in the height direction. Specifically, the caulking is composed of a recess formed on the front surface side of the punching member and a protrusion formed on the back surface side of the punching member. The caulking protrusions of the other punching members are fitted into the caulking recesses of one punching member. Therefore, the caulking protrusions formed on the punched member forming the lowermost layer of the laminated body may protrude outward from the lower end surface of the laminated body. In this case, when a plurality of block bodies are laminated, the protrusions of caulking may interfere with the adjacent block bodies, and a gap may be generated between the block bodies. Therefore, the output density of the motor may decrease as the space factor (the ratio of the volume of the punched member to the total volume of the rotor laminated iron core) decreases.

Therefore, the present disclosure describes a rotor laminated iron core and a method for manufacturing a rotor laminated iron core, which can improve the space factor while exerting the effect of skew.

The rotor laminated iron core according to one aspect of the present disclosure includes a laminated body in which first to Nth (N is a natural number of 2 or more) blocks are laminated. The mth block body of the first to Nth block bodies (m is an arbitrary natural number among 1 to N) is configured by connecting a plurality of punching members to each other by caulking the mth. The mth magnet insertion hole extending in the height direction and the mth positioning portion extending in the height direction are included. In the state where the first to Nth block bodies are laminated, the first to Nth caulking coincides with each other in the height direction, and the first to Nth positioning portions coincide with each other in the height direction. , Between at least one set of nth (n is any natural number among 1 to N-1) and n + 1 block bodies adjacent to each other in the height direction among the first to Nth block bodies. The nth and nth + 1st magnet insertion holes are displaced in the circumferential direction. The protrusion of the nth caulking protruding from the lower end surface of the nth block body is housed in the recess of the n + 1 caulking located on the upper end surface of the n + 1 block body, but the nth block body and the thth It is not fastened to the n + 1 block body by the nth and n + 1 caulking.

A method for manufacturing a rotor laminated iron core according to another aspect of the present disclosure is to obtain a block body of the first to Nth (N is a natural number of 2 or more), and the block body of the first to Nth blocks is obtained. The m-th (m is an arbitrary natural number from 1 to N) block body is composed of a plurality of punched members fastened to each other by caulking of the m-th, and extends in the height direction. The inclusion of the magnet insertion hole of m and the m-th positioning portion extending in the height direction, the first to N-th caulking coincide with each other in the height direction, and the first to N-th positioning portions are aligned with each other in the height direction. The nth (n is an arbitrary natural number among 1 to N-1) block bodies and the n + 1th block bodies that match in the height direction and are adjacent to each other in the height direction among the first to Nth block bodies. It includes laminating the first to Nth block bodies so that the nth and n + 1 magnet insertion holes are displaced from each other in the circumferential direction to obtain a laminated body. To obtain the laminated body, the nth block body and the n + 1 block body project from the lower end surface of the nth block body so as not to be fastened by the nth and n + 1 caulking. Containing the protrusion of the nth caulking in the recess of the n + 1 caulking located on the upper end surface of the n + 1 block body.

According to the laminated iron core and the method for manufacturing the laminated iron core according to the present disclosure, it is possible to improve the space factor while exerting the effect of skewing.

FIG. 1 is an exploded perspective view showing an example of a rotor. FIG. 2A is a top view of the upper block body, and FIG. 2B is a top view of the lower block body. FIG. 3 is a diagram for explaining the positional relationship between the magnet insertion hole of the upper block body and the magnet insertion hole of the lower block body. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a schematic view showing an example of an apparatus for manufacturing a rotor laminated iron core. FIG. 6 is a schematic view showing an example of a punching device. FIG. 7 is a cross-sectional view schematically showing a mechanism for stacking punched members and a mechanism for discharging a block body from a die plate. FIG. 8 is a diagram showing an example of the layout of the punching process. FIG. 9 is a conceptual diagram showing a side view of another example of the laminated body.

Hereinafter, an example of the embodiment according to the present disclosure will be described in more detail with reference to the drawings. In the following description, the same code will be used for the same element or the element having the same function, and duplicate description will be omitted.

[Rotor configuration]
First, the configuration of the rotor 1 (rotor) will be described with reference to FIGS. 1 to 4. The rotor 1 constitutes an electric motor (motor) by being combined with a stator (stator). In this embodiment, the rotor 1 constitutes an embedded magnet type (IPM) motor. The rotor 1 includes a rotor laminated iron core 2 (rotor core) and a shaft 3.

The rotor laminated iron core 2 includes a laminated body 10 and end face plates 4 and 5. The laminated body 10 is configured by laminating two block bodies BL1 and BL2.

The block body BL1 has a cylindrical shape as shown in FIGS. 1 and 2 (a). In the central portion of the block body BL1, a shaft hole BL1a that penetrates the block body BL1 so as to extend along the central axis Ax is provided. The shaft hole BL1a extends in the height direction (stacking direction) of the block body BL1. Since the block body BL1 rotates around the central axis Ax in the present embodiment, the central axis Ax is also a rotation axis.

A pair of ridges BL1b (positioning portions) are formed on the inner peripheral surface of the shaft hole BL1a. Both the ridges BL1b extend in the height direction from the upper end surface to the lower end surface of the block body BL1. The pair of ridges BL1b face each other with the central axis Ax in between, and project from the inner peripheral surface of the block body BL1 toward the central axis Ax.

A plurality of magnet insertion holes BL11 having a rectangular shape are formed in the block body BL1. The magnet insertion hole BL11 penetrates the block body BL1 so as to extend along the central axis Ax. That is, the magnet insertion hole BL11 extends in the height direction. The magnet insertion holes BL11 are arranged at predetermined intervals along the outer peripheral edge of the block body BL1. Specifically, the block body BL1 is assembled so that two magnet insertion holes BL11 have a V-shape that expands toward the outer peripheral edge side of the block body BL1, and eight sets of magnet insertion holes BL11 are at the center. It is arranged approximately every 45 ° around the axis Ax. The position, shape and number of the magnet insertion holes BL11 may be changed according to the application of the motor, the required performance and the like.

A permanent magnet BL12 is inserted in each magnet insertion hole BL11. As a result, N poles and S poles are alternately expressed on the peripheral surface of the block body BL1. The shape of the permanent magnet BL12 is not particularly limited, but in the present embodiment, it has a rectangular parallelepiped shape. The type of the permanent magnet BL12 may be determined according to the application of the motor, the required performance, and the like, and may be, for example, a sintered magnet or a bonded magnet.

The permanent magnet BL12 is fixed by the solidifying resin BL13 in the magnet insertion hole BL11. The solidified resin BL13 is a solidified resin after the molten resin material (molten resin) is filled in the magnet insertion hole BL11 after the permanent magnet BL12 is inserted. The solidified resin BL13 has a function of fixing the permanent magnet BL12 in the magnet insertion hole BL11 and a function of joining adjacent punching members W1 in the vertical direction. Examples of the resin material constituting the solidified resin BL13 include a thermosetting resin and a thermoplastic resin. Specific examples of the thermosetting resin include a resin composition containing an epoxy resin, a curing initiator, and an additive. Examples of the additive include a filler, a flame retardant, a stress reducing agent and the like.

The block body BL1 is configured by stacking a plurality of punching members W1. The punched member W1 is a plate-shaped body in which an electromagnetic steel sheet ES, which will be described later, is punched into a predetermined shape, and has a shape corresponding to the block body BL1. The block body BL1 may be configured by so-called transshipment. "Transposition" means stacking a plurality of punched members while relatively shifting the angles of the punched members. The transposition is mainly carried out for the purpose of offsetting the plate thickness deviation of the block body. The rolling angle may be set to any size.

The punching members W1 adjacent to each other in the stacking direction are fastened by the caulking portion BL14. Specifically, as shown in FIG. 4, the caulking portion BL14 has a caulking BL15 formed in a punching member W1 _N other than the lowermost layer and a through hole BL16 formed in the punching member W1 _B of the lowermost layer. And include.

The caulking BL15 is composed of a recess BL15a formed on the front surface (upper surface) side of the punching member W1 _N and a protrusion BL15b formed on the back surface (mask) side of the punching member W1 _N. The caulking BL15 has, for example, a mountain shape as a whole. The caulking BL15 having such a shape is also referred to as "V-shaped caulking".

The recess BL15a of one punching member W1 _N is fitted with the protrusion BL15b of another punching member W1 _N adjacent to the surface side of the one punching member W1 _N. The protrusion BL15b of one punching member W1 _N is fitted with a recess BL15a of another punching member W1 _N adjacent to the back surface side of the one punching member W1 _N.

The through hole BL16 is an elongated hole having a shape corresponding to the outer shape of the caulking BL15. When the caulking BL15 is a V-shaped caulking, the through hole BL16 has a rectangular shape. The protrusion _BL15b of the punching member _W1N adjacent to the punching member W1B is fitted in the through hole BL16. The through hole BL16 has a function of preventing the subsequently formed punching member from being fastened to the already manufactured block body by caulking (projection) when the block body is continuously manufactured.

As shown in FIG. 4, the tip of the protrusion BL15b of the caulking BL15 protrudes outward from the through hole BL16. That is, the tip end portion of the protrusion BL15b of the caulking BL15 slightly protrudes from the lower end surface of the block body BL1.

The block body BL2 has a cylindrical shape as shown in FIGS. 1 and 2 (b). In the central portion of the block body BL2, a shaft hole BL2a penetrating the block body BL2 is provided so as to extend along the central axis Ax. The shaft hole BL2a extends in the height direction (stacking direction) of the block body BL2. Since the block body BL2 rotates around the central axis Ax in the present embodiment, the central axis Ax is also a rotation axis.

A pair of ridges BL2b (positioning portions) are formed on the inner peripheral surface of the shaft hole BL2a. Both the ridges BL2b extend in the height direction from the upper end surface to the lower end surface of the block body BL2. The pair of ridges BL2b face each other with the central axis Ax in between, and project from the inner peripheral surface of the block body BL2 toward the central axis Ax.

A plurality of magnet insertion holes BL21 having a rectangular shape are formed in the block body BL2. The magnet insertion hole BL21 penetrates the block body BL2 so as to extend along the central axis Ax. That is, the magnet insertion hole BL21 extends in the height direction. The magnet insertion holes BL21 are arranged at predetermined intervals along the outer peripheral edge of the block body BL2. Specifically, the block body BL2 is configured so that the two magnet insertion holes BL21 have a V-shape that expands toward the outer peripheral edge side of the block body BL2, and eight sets of magnet insertion holes BL21 are at the center. It is arranged approximately every 45 ° around the axis Ax. The position, shape and number of the magnet insertion holes BL21 may be changed according to the application of the motor, the required performance and the like.

A permanent magnet BL22 is inserted in each magnet insertion hole BL21. As a result, N poles and S poles are alternately expressed on the peripheral surface of the block body BL2. The shape of the permanent magnet BL22 is not particularly limited, but in the present embodiment, it has a rectangular parallelepiped shape. The type of the permanent magnet BL22 may be determined according to the application of the motor, the required performance, and the like, and may be, for example, a sintered magnet or a bonded magnet.

The permanent magnet BL22 is fixed by the solidifying resin BL23 in the magnet insertion hole BL21. The solidified resin BL23 is obtained by solidifying the molten resin after the molten resin material (molten resin) is filled in the magnet insertion hole BL21 after the permanent magnet BL22 is inserted. The solidified resin BL23 has a function of fixing the permanent magnet BL22 in the magnet insertion hole BL21 and a function of joining adjacent punching members W2 in the vertical direction. Examples of the resin material constituting the solidified resin BL23 include a thermosetting resin and a thermoplastic resin. Specific examples of the thermosetting resin include a resin composition containing an epoxy resin, a curing initiator, and an additive. Examples of the additive include a filler, a flame retardant, a stress reducing agent and the like.

The block body BL2 is configured by stacking a plurality of punching members W2. The punched member W2 is a plate-shaped body in which an electromagnetic steel sheet ES, which will be described later, is punched into a predetermined shape, and has a shape corresponding to the block body BL2. The block body BL2 may be configured by so-called transshipment.

The punching members W2 adjacent to each other in the stacking direction are fastened by the caulking portion BL24. Specifically, as shown in FIG. 4, the caulking portion BL24 has a caulking BL25 formed in a punching member W2 _N other than the lowermost layer and a through hole BL26 formed in the punching member W2 _B of the lowermost layer. And include.

The caulking BL25 is composed of a recess BL25a formed on the front surface (upper surface) side of the punching member W2 _N and a protrusion BL25b formed on the back surface (mask) side of the punching member W2 _N. The caulking BL25 has, for example, a mountain shape as a whole. The caulking BL25 having such a shape is also referred to as "V-shaped caulking".

The recess _BL25a of one punching member W2N is fitted with the protrusion _BL25b of another punching member _W2N adjacent to the surface side of the one punching member W2N. The protrusion _BL25b of one punching member W2N is fitted with a recess _BL25a of yet another punching member _W2N adjacent to each other on the back surface side of the one punching member W2N.

The through hole BL26 is an elongated hole having a shape corresponding to the outer shape of the caulking BL25. When the caulking BL25 is V-shaped caulking, the through hole BL26 has a rectangular shape. The protrusion _BL25b of the punching member _W2N adjacent to the punching member W2B is fitted in the through hole BL26. The through hole BL26 has a function of preventing the subsequently formed punching member from being fastened to the already manufactured block body by caulking (projection) when the block body is continuously manufactured.

As shown in FIG. 4, the tip of the protrusion BL25b of the caulking BL25 protrudes outward from the through hole BL26. That is, the tip of the protrusion BL25b of the caulking BL25 slightly protrudes from the lower end surface of the block body BL2.

Here, as shown in FIG. 3, in a state where the block bodies BL1 and BL2 are laminated, the ridges BL1b of the block body BL1 and the ridges BL2b of the block body BL2 coincide with each other in the height direction. Therefore, the ridges BL1b and BL2b function as a key member for attaching the shaft 3 as a whole.

In a state where the block bodies BL1 and BL2 are laminated, the crimped portion BL14 of the block body BL1 and the crimped portion BL24 of the block body BL2 coincide with each other in the height direction. At this time, as shown in FIG. 4, the protrusion BL15b of the caulking BL15 slightly protruding from the lower end surface of the block body BL1 is a recess of the caulking BL25 in the punching member W2 _T located at the uppermost layer of the adjacent block body BL2. It is housed in BL25a. Therefore, it is difficult for a gap to occur between the block bodies BL1 and BL2. Since the amount of protrusion BL15b from the lower end surface of the block body BL1 is small, the protrusion BL15b does not fit with the recess BL25a. That is, the block body BL1 and the block body BL2 are not fastened by the caulking BL15 and BL25.

As shown in FIGS. 1 and 3, in a state where the block bodies BL1 and BL2 are laminated, the magnet insertion holes BL11 of the block body BL1 and the magnet insertion holes BL21 of the block body BL2 are the circumferences of the block bodies BL1 and BL2. It is out of alignment in the direction. That is, the magnet insertion holes BL11 and BL21 do not match in the height direction. Specifically, when the number of magnetic poles of the rotor laminated iron core 2 is X, the magnet insertion hole BL11 is 0.5 ° to (360 ° / X /) with respect to the magnet insertion hole BL21 when viewed from above. 2) It may be off by about.

The end face plates 4 and 5 have an annular shape as shown in FIG. That is, shaft holes 4a and 5a penetrating the end face plates 4 and 5 are provided in the central portions of the end face plates 4 and 5, respectively.

A pair of protrusions 4b are formed on the inner peripheral surface of the end face plate 4. The pair of protrusions 4b face each other with the central axis Ax in between, and project from the inner peripheral surface of the end face plate 4 toward the central axis Ax. A pair of protrusions 5b are formed on the inner peripheral surface of the end face plate 5. The pair of protrusions 5b face each other with the central axis Ax in between, and project from the inner peripheral surface of the end face plate 5 toward the central axis Ax.

The end face plate 4 is arranged on the upper end surface of the laminated body 10 (block body BL1). That is, the end face plate 4 covers the punching member W1 _T on the uppermost layer of the block body BL1. The end face plate 5 is arranged on the lower end surface of the laminated body 10 (block body BL2). That is, the end face plate 5 covers the punching member W2 _B of the lowermost layer of the block body BL2. The end face plates 4 and 5 may be integrated with the laminated body 10.

As shown in FIGS. 1 and 4, a housing recess 5c is formed on the upper surface of the end face plate 5. The accommodating recess 5c is positioned so as to correspond to the caulked portion BL24 of the block body BL2. In a state where the end face plate 5 is attached to the lower end surface of the block body BL2, the protrusion BL25b of the caulking BL25 slightly protruding from the lower end surface of the block body BL2 is housed in the housing recess 5c as shown in FIG. ing.

The end face plates 4 and 5 may be made of, for example, aluminum, stainless steel, or the like. Examples of the stainless steel include austenitic stainless steel (SUS304 and the like). The end face plates 4 and 5 may be made of a material other than a non-magnetic material.

The shaft 3 has a columnar shape as a whole. A pair of concave grooves 3a are formed on the shaft 3. The concave groove 3a extends from one end to the other end of the shaft 3 in the extending direction of the shaft 3 and functions as a key groove. The shaft 3 is inserted into the shaft holes BL1a, BL2a, 4a, 5a. At this time, the protrusions BL1b, BL2b and the protrusions 3b, 4b are engaged with the concave groove 3a. As a result, the rotational force is transmitted between the shaft 3 and the rotor laminated iron core 2.

[Manufacturing equipment for rotor laminated iron core]
Subsequently, with reference to FIG. 5, the manufacturing apparatus 100 of the rotor laminated iron core 2 will be described. The manufacturing apparatus 100 is an apparatus for manufacturing a rotor laminated iron core 2 from an electromagnetic steel sheet ES (material to be processed) which is a strip-shaped metal plate. The manufacturing apparatus 100 includes an anchorer 110, a delivery device 120 (delivery unit), a punching device 130, and a controller 150 (control unit).

The uncoiler 110 rotatably holds the coil material 111 in a state where the coil material 111, which is a strip-shaped electromagnetic steel sheet ES wound in a coil shape, is mounted. The delivery device 120 has a pair of rollers 121 and 122 that sandwich the electromagnetic steel sheet ES from above and below. The pair of rollers 121 and 122 rotate and stop based on the instruction signal from the controller 150, and intermittently sequentially feed the electromagnetic steel sheet ES toward the punching device 130.

The controller 150 generates an instruction signal for operating the transmission device 120 and the punching device 130, respectively, based on, for example, a program recorded on a recording medium (not shown) or an operation input from an operator. It is transmitted to the sending device 120 and the punching device 130.

[Punching device]
Subsequently, the punching device 130 will be described with reference to FIGS. 5 to 7. The punching device 130 has a function of sequentially punching the electromagnetic steel sheet ES intermittently sent out by the delivery device 120 to form punching members W1 and W2, and the punching members W1 and W2 obtained by punching. It has a function of manufacturing the block bodies BL1 and BL2 by sequentially laminating and superimposing the blocks.

As shown in FIGS. 5 and 6, the punching device 130 includes a base 131, a lower mold 132, a die plate 133, a stripper 134, an upper mold 135, a top plate 136, and a press machine 137 (driving unit). ), A hanger 138, punches A1 to A6, and positioning pins B1 to B6. The base 131 supports the lower mold 132 mounted on the base 131.

The lower mold 132 supports the die plate 133 placed on the lower mold 132. The lower mold 132 is provided with discharge holes C1 to C6 at positions corresponding to the punches A1 to A6, from which the materials punched from the electrical steel sheet ES (for example, punched members W1, W2, waste materials, etc.) are discharged. ing. As shown in FIG. 7, a cylinder 132a, a stage 132b, and a pusher 132c are arranged in the discharge hole C6.

The cylinder 132a supports the punching members W1 and W2 in order to prevent the punching members W1 and W2 punched from the electromagnetic steel sheet ES by the punch A6 from falling downward. The cylinder 132a is configured to be movable in the vertical direction based on an instruction signal from the controller 150. Specifically, the cylinder 132a intermittently moves downward each time the punching members W1 and W2 are stacked on the cylinder 132a. When the punching members W1 and W2 are stacked up to a predetermined number on the cylinder 132a to form the block bodies BL1 and BL2, the cylinder 132a moves to a position where the surface of the cylinder 132a is at the same height as the surface of the stage 132b.

The stage 132b is provided with a hole through which the cylinder 132a can pass. The pusher 132c is configured to be horizontally movable on the surface of the stage 132b based on the instruction signal from the controller 150. With the cylinder 132a moved to a position where the surface of the cylinder 132a is flush with the surface of the stage 132b, the pusher 132c dispenses the block bodies BL1 and BL2 from the cylinder 132a to the stage 132b. The block bodies BL1 and BL2 paid out to the stage 132b are discharged from the punching device 130.

Returning to FIG. 6, the die plate 133 has a function of forming the punching members W1 and W2 together with the punches A1 to A6. The die plate 133 is provided with dies D1 to D6 at positions corresponding to the punches A1 to A6, respectively. The dies D1 to D6 are provided with through holes D1a to D6a (die holes) extending in the vertical direction. The through holes D1a to D6a communicate with the corresponding discharge holes C1 to C6, respectively. The diameter of each through hole D1a to D6a is slightly larger than the tip portion of the corresponding punches A1 to A6 so that the tip portion can be inserted therethrough. The die plate 133 is provided with insertion holes E1 to E6 at positions corresponding to the positioning pins B1 to B6, respectively.

The stripper 134 includes a stripper plate 134a and a holding plate 134b. The stripper plate 134a has a function of removing the electromagnetic steel sheet ES that has bitten into the punches A1 to A6 from the punches A1 to A6 when the electromagnetic steel sheet ES is punched out by the punches A1 to A6. The stripper plate 134a is located above the die plate 133. The holding plate 134b holds the stripper plate 134a from above.

The stripper 134 is provided with through holes F1 to F6 at positions corresponding to the punches A1 to A6, respectively. Each of the through holes F1 to F6 extends in the vertical direction and communicates with the through holes D1a to D6a of the corresponding dies D1 to D6. The lower portions of the punches A1 to A6 are inserted into the through holes F1 to F6, respectively. The lower portions of the punches A1 to A6 are slidable in the through holes F1 to F6, respectively.

The stripper 134 is provided with through holes F7 to F12 at positions corresponding to the positioning pins B1 to B6, respectively. Each of the through holes F7 to F12 extends in the vertical direction and communicates with the corresponding insertion holes E1 to E6. The lower portions of the positioning pins B1 to B6 are inserted into the through holes F7 to F12, respectively. The lower portions of the positioning pins B1 to B6 are slidable in the through holes F7 to F12, respectively.

The upper die 135 is located above the stripper 134. The bases (upper parts) of the punches A1 to A6 and the positioning pins B1 to B6 are fixed to the upper die 135. Therefore, the upper die 135 holds the punches A1 to A6 and the positioning pins B1 to B6. At each of the upstream and downstream ends of the punching device 130 of the upper die 135, a storage space 135a located on the top plate 136 side and extending in the vertical direction and penetrating downward from the storage space 135a, respectively. A through hole 135b is provided.

The top plate 136 is located above the upper mold 135. The top plate 136 holds the upper mold 135. The press machine 137 is located above the top plate 136. The piston of the press machine 137 is connected to the top plate 136 and operates based on an instruction signal from the controller 150. When the press machine 137 operates, the piston expands and contracts, and the stripper 134, the upper die 135, the top plate 136, the hanger 138, the punches A1 to A6, and the positioning pins B1 to B6 (hereinafter, these are referred to as movable portions 160). It moves up and down as a whole.

The hanger 138 suspends and holds the stripper 134 on the upper die 135. The hanger 138 has a long rod portion 138a and a head portion 138b provided at the upper end of the rod portion 138a. The lower end of the rod portion 138a is fixed to the stripper 134. The upper end of the rod portion 138a is inserted into the through hole 135b of the upper die 135. The head portion 138b has a larger diameter than the lower end portion and is accommodated in the accommodation space 135a of the upper die 135. Therefore, the head 138b can move up and down with respect to the upper mold 135 in the accommodation space 135a.

The punches A1 to A6 have a function of punching the electromagnetic steel sheet ES into a predetermined shape together with the die plates 133 (dies D1 to D6). The punches A1 to A6 are arranged so as to be arranged in this order from the upstream side (delivery device 120 side) to the downstream side of the punching device 130, respectively. A plurality of punches A1 (for example, two punches A1) are lined up in the width direction of the electrical steel sheet ES (hereinafter, simply referred to as "width direction"). A plurality of punches A2 (for example, two punches A2) are arranged side by side in the width direction. A plurality of punches A3 (for example, two punches A3) are arranged side by side in the width direction. A plurality of punches A4 (for example, two punches A4) are arranged side by side in the width direction. A plurality of punches A5 (for example, two punches A5) are arranged side by side in the width direction. In the width direction, a plurality of punches A6 (for example, two punches A6) are arranged side by side. The plurality of discharge holes C1 and the plurality of dies D1 are also arranged in the width direction so as to correspond to the plurality of punches A1. The same applies to the other plurality of discharge holes C2 to C6 and dies D2 to D6.

The tip shape of each punch A1 is substantially the same. That is, the punched shapes of the electrical steel sheets ES by each punch A1 are substantially the same. The tip shapes of the plurality of punches A2 are all substantially the same, but the phases are different. That is, the punched shapes of the electrical steel sheets ES by each punch A2 are substantially the same, but are deviated by a predetermined angle. In other words, the punched shape of the electrical steel sheet ES by each punch A2 is rotationally symmetric. The tip shape of each punch A3 is substantially the same. That is, the punched shapes of the electrical steel sheets ES by each punch A3 are substantially the same.

The tip shape of each punch A4 is substantially the same. That is, the punched shapes of the electrical steel sheets ES by each punch A4 are substantially the same. The tip shape of each punch A5 is substantially the same. That is, the punched shapes of the electrical steel sheets ES by each punch A5 are substantially the same. The tip shape of each punch A6 is substantially the same. That is, the punched shapes of the electrical steel sheets ES by each punch A6 are substantially the same.

The positioning pins B1 to B6 have a function of positioning the electrical steel sheet ES when the electrical steel sheet ES is punched by the punches A1 to A6. The positioning pins B1 to B6 are arranged so as to be arranged in this order from the upstream side (delivery device 120 side) to the downstream side of the punching device 130, respectively.

[Manufacturing method of rotor laminated iron core]
Subsequently, a method for manufacturing the rotor laminated iron core 2 will be described with reference to FIGS. 5 to 8. First, the electrical steel sheet ES is sent out to the punching device 130 by the delivery device 120, and when the workpiece portion of the electrical steel sheet ES reaches the punch A1, the controller 150 instructs the press machine 137, and the press machine 137 moves the movable portion 160. Is pushed downward toward the die plate 133. Even after the stripper 134 reaches the die plate 133 and the electromagnetic steel sheet ES is sandwiched between them, the controller 150 instructs the press machine 137, and the press machine 137 pushes the movable portion 160 downward.

At this time, the stripper 134 does not move, but the tips of the punches A1 to A6 and the positioning pins B1 to B6 move in the through holes F1 to F12 of the stripper plate 134a, and the corresponding through holes D1a to the die plate 133 are moved. It reaches D6a and the insertion holes E1 to E6. Therefore, the electrical steel sheet ES is punched by the punch A1 along a predetermined punching shape, and a pair of through holes ES1 are formed in the vicinity of both side edges of the electrical steel sheet ES (see positions S1 in FIGS. 6 and 8). That is, the pair of through holes ES1 are arranged in a row in the width direction. The punched waste material is discharged from the discharge hole C1 of the lower mold 132. After that, the press machine 137 operates to raise the movable portion 160.

Next, when the electrical steel sheet ES is sent out by the delivery device 120 and the workpiece portion of the electrical steel sheet ES reaches the punch A2, the controller 150 instructs the press machine 137, and the press machine 137 raises and lowers the movable portion 160. As a result, the electrical steel sheet ES is punched out along a predetermined punching shape by the plurality of punches A2 arranged in a row in the width direction, and the plurality of punching portions ES2 ₁ and ES2 ₂ are formed on the electrical steel sheet ES (FIGS. 6 and 6). See position S3 in FIG. 8). That is, the plurality of punched portions ES2 ₁ and ES2 ₂ are arranged in a row in the width direction.

Each of the punched portions ES2 ₁ and ES2 ₂ is composed of 16 through holes arranged in a circular shape. Each through hole corresponds to the magnet insertion holes BL11 and BL21. Here, since the phases of the plurality of punches A2 arranged in a row in the width direction are different, the punched portions ES2 ₁ and ES2 ₂ that are rotationally symmetric with each other are formed. The punched waste material is discharged from the discharge hole C2 of the lower mold 132. When the electromagnetic steel sheet ES is punched by the punch A2, the positioning pins B1 and B2 are inserted into the through holes ES1 and the insertion holes E1 and E2 (see positions S2 and S4 in FIGS. 6 and 8).

Next, when the electrical steel sheet ES is sent out by the delivery device 120 and the workpiece portion of the electrical steel sheet ES reaches the punch A3, the controller 150 instructs the press machine 137, and the press machine 137 raises and lowers the movable portion 160. As a result, the electrical steel sheet ES is punched out along a predetermined punching shape by the plurality of punches A3 arranged in a row in the width direction, and the plurality of punching portions ES3 are formed in the electrical steel sheet ES (positions of FIGS. 6 and 8). See S5). That is, the plurality of punched portions ES3 are arranged in a row in the width direction.

Each punched portion ES3 is composed of a circular through hole. Each through hole corresponds to the shaft holes BL1a and BL2a. The punched waste material is discharged from the discharge hole C3 of the lower mold 132. When the electromagnetic steel sheet ES is punched by the punch A3, the positioning pins B2 and B3 are inserted into the through holes ES1 and the insertion holes E2 and E3 (see positions S4 and S6 in FIGS. 6 and 8).

Next, when the electrical steel sheet ES is sent out by the delivery device 120 and the workpiece portion of the electrical steel sheet ES reaches the punch A4, the controller 150 instructs the press machine 137, and the press machine 137 raises and lowers the movable portion 160. As a result, the electrical steel sheet ES is punched out along a predetermined punched shape by the plurality of punches A4 arranged in the width direction, and the plurality of punched portions ES4 are formed on the electrical steel sheet ES (positions S7 in FIGS. 6 and 8). reference). That is, the plurality of punched portions ES4 are arranged in the width direction.

Each punched portion ES4 is composed of eight through holes arranged in a circular shape. Each through hole corresponds to the through holes BL16 and BL26 of the caulked portions BL14 and BL24. The punched waste material is discharged from the discharge hole C4 of the lower mold 132. When the electromagnetic steel sheet ES is punched by the punch A4, the positioning pins B3 and B4 are inserted into the through holes ES1 and the insertion holes E3 and E4 (see positions S6 and S8 in FIGS. 6 and 8). When the caulking BL15 and BL25 of the caulking portions BL14 and BL24 are formed (described later), the electromagnetic steel sheet ES is not punched by the punch A4.

Next, when the electrical steel sheet ES is sent out by the delivery device 120 and the workpiece portion of the electrical steel sheet ES reaches the punch A5, the controller 150 instructs the press machine 137, and the press machine 137 raises and lowers the movable portion 160. As a result, the electrical steel sheet ES is half punched along a predetermined punched shape by the plurality of punches A5 arranged in the width direction, and the plurality of machined portions ES5 are formed on the electrical steel sheet ES (positions of FIGS. 6 and 8). See S9). That is, the plurality of processed portions ES5 are arranged in the width direction.

Each processed portion ES5 is composed of eight uneven portions arranged in a circular shape. Each uneven portion corresponds to the caulking BL15 and BL25 of the caulking portions BL14 and BL24. When each processed portion ES5 is a through hole, the punched waste material is discharged from the discharge hole C4 of the lower mold 132. When the electromagnetic steel sheet ES is punched by the punch A5, the positioning pins B4 and B5 are inserted into the through holes ES1 and the insertion holes E4 and E5 (see positions S8 and S10 in FIGS. 6 and 8).

Next, when the electrical steel sheet ES is sent out by the delivery device 120 and the workpiece portion of the electrical steel sheet ES reaches the punch A6, the controller 150 instructs the press machine 137, and the press machine 137 raises and lowers the movable portion 160. As a result, the electromagnetic steel sheet ES is punched out along a predetermined punching shape by the plurality of punches A6 arranged in the width direction, and a plurality of punching portions ES6 are formed (see positions S11 in FIGS. 6 and 8). That is, the plurality of punched portions ES6 are arranged in the width direction.

Each punching section ES6 corresponds to punching members W1 and W2. When the electromagnetic steel sheet ES is punched by the punch A6, the positioning pins B5 and B6 are inserted into the through holes ES1 and the insertion holes E5 and E6 (see positions S10 and S12 in FIGS. 6 and 8). In this way, the punched member W1 is placed on the cylinder 132a in one discharge hole C6, and is laminated while being fastened to the punched member W1 next. Similarly, the punched member W2 is placed on the cylinder 132a in the other discharge hole C6, and is laminated while being fastened to the punched member W2 that has been punched out next. By repeating the above steps, the block bodies BL1 and BL2 are formed. After that, the end face plates 4 and 5 are attached to the laminated body 10 on which the block bodies BL1 and BL2 are laminated to form the rotor laminated iron core 2. Further, the shaft 3 is attached to the rotor laminated iron core 2, and the rotor 1 is completed.

[Action]
In the above embodiment, since the magnet insertion holes BL11 and BL21 are displaced in the circumferential direction, it is possible to obtain the effect of skewing (reduction of torque ripple, vibration, noise, etc.). In addition, in the above embodiment, since the protrusion BL15b of the caulking BL15 protruding from the lower end surface of the block body BL1 is housed in the recess BL25a of the facing caulking BL25, there is almost no gap between the block bodies BL1 and BL2. It will not occur. Therefore, it is possible to improve the space factor.

In the above embodiment, the block bodies BL1 and BL2 are laminated so that the protrusion BL15b of the caulking BL15 protruding from the lower end surface of the block body BL1 is accommodated in the recess BL25a of the facing caulking BL25. That is, the punching directions of the punching members W1 and W2 constituting the block bodies BL1 and BL2 are the same. Therefore, even if the block bodies BL1 and BL2 are warped during the punching process of the punching members W1 and W2, the directions of the warp are the same, so that there is a gap between the block bodies BL1 and BL2. It is less likely to occur. Therefore, it is possible to further improve the space factor. Further, since a gap is less likely to be generated between the block bodies BL1 and BL2, it is possible to prevent the molten resin or the like for fixing the permanent magnets BL12 and BL22 from leaking from the gap between the block bodies BL1 and BL2. Therefore, it is possible to increase the yield of products.

In the above embodiment, the protrusion BL25b of the caulking BL25 slightly protruding from the lower end surface of the block body BL2 is housed in the housing recess 5c. Therefore, it is difficult for a gap to occur between the block body BL2 and the end face plate 5. On the other hand, since the protrusion BL15b of the caulking BL15 does not protrude from the upper end surface of the block body BL1, even if the accommodating recess is not formed in the end face plate 4, a gap is unlikely to occur between the block body BL1 and the end face plate 4. It has become. Therefore, it is not necessary to provide the accommodating recess in the end face plate 4. Therefore, the product can be manufactured at a lower cost.

In the above embodiment, in the state where the block bodies BL1 and BL2 are laminated, the ridges BL1b of the block body BL1 and the ridges BL2b of the block body BL2 coincide with each other in the height direction. Therefore, the block bodies BL1 and BL2 can be positioned by the key member composed of the protrusions BL1b and BL2b. Therefore, it is possible to use the key member together for positioning the block bodies BL1 and BL2.

[Modification example]
Although the embodiments according to the present disclosure have been described in detail above, various modifications may be added to the above embodiments without departing from the scope of claims and the gist thereof.

(1) A set of magnets in which two or more permanent magnets are combined may be inserted into one magnet insertion hole. In this case, a plurality of permanent magnets may be arranged in the longitudinal direction of the magnet insertion hole in one magnet insertion hole. A plurality of permanent magnets may be arranged in the height direction in one magnet insertion hole. In one magnet insertion hole, a plurality of permanent magnets may be arranged in the longitudinal direction and a plurality of permanent magnets may be arranged in the height direction.

(2) In the above embodiment, a rotor in which a permanent magnet is embedded inside the rotor laminated iron core 2 (a rotor used in an embedded magnet type motor) has been described, but inside a through hole penetrating the block body. The present disclosure may be applied to a type of rotor in which a permanent magnet is not embedded (for example, a rotor used in a synchronous reluctance motor).

(3) In the above embodiment, the shaft 3 is provided with a pair of concave grooves 3a that function as key grooves, and a pair of protrusions 4b and 5b and ridges BL1b and BL2b that function as keys are end face plates 4, respectively. Although it is provided in 5 and the block bodies BL1 and BL2, the number of key grooves and the corresponding keys may be one or more.

(4) In the above embodiment, the protrusions BL1b and BL2b function as positioning portions for positioning the block bodies BL1 and BL2, but other elements may function as positioning portions. For example, a concave groove functioning as a key groove may be provided in each block body BL1 and BL2, and the block body BL1 and BL2 may be positioned by the concave groove. For example, through holes such as lightweight holes and holes that function as liquid flow paths are provided in the block bodies BL1 and BL2, and the block bodies BL1 and BL2 may be positioned by the through holes.

(5) The laminated body 10 may be configured by laminating N (N is a natural number of 2 or more) blocks. In this case as well, the caulking portion and the positioning portion (key member, etc.) are aligned in the height direction with all the block bodies laminated, but at least the magnet insertion holes are circumferentially located between the adjacent block bodies. It may be offset in the direction. Adjacent block bodies may not be fastened by caulking.

(6) When the laminated body 10 is composed of three or more block bodies, when the laminated body 10 is viewed from the radial direction, these are located between the block body located at the upper end and the block body located at the lower end. The magnet insertion holes of the block body may be aligned in the height direction. In this case, when the rotor laminated core 2 constitutes a motor together with the stator laminated core 2, the movement of the rotor laminated core 2 in the rotation axis direction is suppressed. Therefore, since the bias of the load on the shaft 3 is suppressed, it is possible to realize smoother rotation of the rotor laminated iron core 2.

For example, as shown in FIG. 9A, when the laminated body 10 is composed of three block bodies BL1 to BL3, between the block body BL1 located at the upper end and the block body BL3 located at the lower end. The magnet insertion holes of the block bodies BL1 and BL3 coincide with each other in the height direction, but the magnet insertion holes of the block bodies BL1 and BL3 and the block body BL2 located between the block bodies BL1 and BL3 are aligned with each other. The magnet insertion hole of the block body BL2 may not match in the height direction and may be displaced in the circumferential direction. In this case, among the magnetic poles developed on the peripheral surface of the laminated body 10 by the permanent magnet inserted in the magnet insertion hole, the magnetic poles of the same type arranged in the height direction are approximately V-shaped (crank-shaped) as a whole. Present.

For example, as shown in FIG. 9B, when the laminated body 10 is composed of four block bodies BL1 to BL4, between the block body BL1 located at the upper end and the block body BL4 located at the lower end. Although the magnet insertion holes of the block bodies BL1 and BL4 coincide with each other in the height direction, the magnets of the block bodies BL1 and BL4 are inserted between the block bodies BL1 and BL4 and the block bodies BL2 and BL3 located between them. The holes and the magnet insertion holes of the block bodies BL2 and BL3 may not match in the height direction and may be displaced in the circumferential direction. In this case, among the magnetic poles developed on the peripheral surface of the laminated body 10 by the permanent magnet inserted in the magnet insertion hole, the magnetic poles of the same type arranged in the height direction generally have a V shape (crank shape) as a whole. .. It should be noted that the magnet insertion holes of the block bodies BL2 and BL3 may be aligned in the height direction between the block bodies BL2 and BL3 (see FIG. 9B), and may not be aligned in the height direction. It may be displaced in the circumferential direction (not shown).

[Example]
Example 1. The rotor laminated iron core (2) according to one example of the present disclosure includes a laminated body (10) in which first to Nth (N is a natural number of 2 or more) block bodies (BL1, BL2) are laminated. Of the first to Nth block bodies (BL1, BL2), the mth (m is an arbitrary natural number among 1 to N) block bodies (BL1, BL2) are a plurality of punching members (W1, W2). Are configured to be mutually fastened by the mth caulking (BL15, BL25), and the mth magnet insertion hole (BL11, BL21) extending in the height direction and the mth positioning extending in the height direction. The unit (BL1b, BL2b) is included. In a state where the first to Nth block bodies (BL1, BL2) are laminated, the first to Nth caulking (BL15, BL25) coincide with each other in the height direction, and the first to Nth positioning portions. (BL1b, BL2b) coincide with each other in the height direction, but at least one set of n (n is 1 to N-) adjacent to each other in the height direction among the first to Nth block bodies (BL1, BL2). The nth and nth + 1 magnet insertion holes (BL11, BL21) are displaced in the circumferential direction between the block body (BL1) of the arbitrary natural number of 1) and the block body (BL2) of the n + 1th. The protrusion (BL15b) of the nth caulking (BL15) protruding from the lower end surface of the nth block body (BL1) is a recess of the n + 1 caulking (BL25) located on the upper end surface of the n + 1 block body (BL2). Although housed in (BL25a), the nth block body (BL1) and the n + 1 block body (BL2) are not fastened by the nth and n + 1 caulking (BL15, BL25). In this case, since the first to Nth magnet insertion holes are displaced in the circumferential direction, it is possible to obtain the effect of skewing (reduction of torque ripple, vibration, noise, etc.). In addition, in this case, since the protrusion of the nth caulking protruding from the lower end surface of the nth block body is housed in the recess of the facing n + 1 caulking body, it is between the nth and n + 1 block bodies. There is almost no gap in. Therefore, it is possible to improve the space factor.

Example 2. The rotor laminated iron core (2) of Example 1 is arranged on the first end face plate (4) arranged on the upper end surface of the first block body (BL1) and the lower end surface of the Nth block body (BL2). The second end face plate (5) is further provided with the second end face plate (5), and the second end face plate (5) is a protrusion (BL25b) of the Nth caulking (BL25) protruding from the lower end surface of the Nth block body (BL2). ) May include a storage recess (5c) in which it is housed. In this case, the protrusion of the first caulking does not exist on the first end face. Therefore, it is not necessary to provide the accommodating recess in the first end face plate. Therefore, it becomes possible to manufacture the rotor laminated iron core at a lower cost.

Example 3. In the rotor laminated iron core (2) of Example 1 or Example 2, the laminated body (10) is composed of blocks (BL1 to BL3) of the first to Nth (N is a natural number of 3 or more) laminated. The first and Nth magnet insertion holes may be aligned in the height direction between the first block body (BL1) and the Nth block body (BL3). In this case, when the rotor laminated core and the stator laminated core form a motor, the movement of the rotor laminated core in the rotation axis direction is suppressed. Therefore, since the bias of the load on the shaft is suppressed, it is possible to realize smoother rotation of the rotor laminated iron core.

Example 4. In the rotor laminated iron core (2) of any one of Examples 1 to 3, the first to Nth positioning portions (BL1b, BL2b) may be ridges, concave grooves or through holes. In this case, a key member, a key groove, a hole provided for weight reduction or liquid flow, and the like can be used together for positioning.

Example 5. The method for manufacturing the rotor laminated iron core (2) according to another example of the present disclosure is to obtain a block body (BL1, BL2) of the first to Nth (N is a natural number of 2 or more), the first. The block body (BL1, BL2) of the mth (m is an arbitrary natural number among 1 to N) of the Nth block bodies (BL1, BL2) has a plurality of punching members (W1, W2). It is configured to be mutually fastened by caulking (BL15, BL25) of m, and has a third magnet insertion hole (BL11, BL21) extending in the height direction and a positioning portion (BL1b) extending in the height direction. , BL2b) and the first to Nth caulking (BL15, BL25) coincide with each other in the height direction, and the first to Nth positioning portions (BL1b, BL2b) coincide with each other in the height direction. However, at least one set of nth (n is an arbitrary natural number among 1 to N-1) block bodies (BL1) adjacent to each other in the height direction among the first to Nth block bodies (BL1, BL2). The first to Nth block bodies (BL1, BL2) are laminated so that the nth and nth + 1 magnet insertion holes (BL11, BL21) are displaced in the circumferential direction between the nth block body (BL2) and the nth block body (BL2). To obtain the laminated body (10). Obtaining the laminated body (10) means that the nth block body (BL1) and the n + 1 block body (BL2) are not fastened by the nth and n + 1 caulking (BL15, BL25). The protrusion (BL15b) of the nth caulking (BL15) protruding from the lower end surface of the block body (BL1) is the recess (BL25a) of the n + 1 caulking (BL25) located on the upper end surface of the n + 1 block body (BL2). Including accommodating inside. In this case, the same effect as in Example 1 can be obtained.

Example 6. In the method of Example 5, the first end face plate (4) is arranged on the upper end surface of the first block body (BL1), and the inside of the accommodating recess (5c) formed in the second end face plate (5). A second end face plate is placed on the lower end surface of the Nth block (BL2) so that the protrusion (BL25b) of the Nth caulking (BL25) protruding from the lower end surface of the Nth block body (BL2) is accommodated. It may further include arranging (5). In this case, the same effect as in Example 2 can be obtained.

Example 7. In the method of Example 5 or Example 6, obtaining the laminated body (10) means that the first and Nth magnet insertion holes are formed between the first block body (BL1) and the Nth block body (BL3). It may include stacking the first to Nth (N is a natural number of 3 or more) blocks (BL1 to BL3) so as to match in the height direction. In this case, the same effect as in Example 3 can be obtained.

Example 8. In any of the methods of Examples 5 to 7, the first to Nth positioning portions may be ridges, concave grooves or through holes. In this case, the same effect as in Example 4 can be obtained.

1 ... Rotor, 2 ... Rotor laminated iron core, 4, 5 ... End face plate, 5c ... Accommodating recess, 10 ... Laminated body, 100 ... Manufacturing equipment, Ax ... Central axis, BL1, BL2 ... Block body, BL1b, BL2b ... Protrusions (positioning part), BL11, BL21 ... Magnet insertion holes, BL15, BL25 ... Caulking, BL15a, BL25a ... Recesses, BL15b, BL15b ... Protrusions, W1, W2 ... Punching members.

Claims (8)

It is provided with a laminated body in which blocks of the first to Nth (N is a natural number of 2 or more) are laminated.
Of the first to Nth block bodies, the mth block body (m is an arbitrary natural number among 1 to N) is
It is composed of a plurality of punched members that are fastened to each other by the m-th caulking.
The mth magnet insertion hole extending in the height direction and the mth positioning portion extending in the height direction are included.
In a state where the first to Nth block bodies are laminated, the first to Nth caulking coincides with each other in the height direction, and the first to Nth positioning portions coincide with each other in the height direction. However, at least one set of nth (n is an arbitrary natural number among 1 to N-1) blocks and n + 1 blocks adjacent to each other in the height direction among the first to Nth blocks. The nth and n + 1 magnet insertion holes are displaced in the circumferential direction from the body.
The nth caulking protrusion protruding from the lower end surface of the nth block body is housed in the n + 1 caulking recess located on the upper end surface of the n + 1 block body. The block body and the n + 1 block body are not fastened by the nth and n + 1 caulking, and the rotor laminated iron core. The first end face plate arranged on the upper end surface of the first block body,
A second end face plate arranged on the lower end surface of the Nth block body is further provided.
The rotor laminated iron core according to claim 1, wherein the second end face plate includes a housing recess in which a protrusion of the Nth caulking projecting from the lower end surface of the Nth block body is housed. The laminated body is configured by laminating the first to Nth blocks (N is a natural number of 3 or more).
The rotor laminated iron core according to claim 1 or 2, wherein the first and Nth magnet insertion holes are aligned in the height direction between the first block body and the Nth block body. The rotor laminated iron core according to any one of claims 1 to 3, wherein the first to Nth positioning portions are ridges, concave grooves or through holes. The purpose is to obtain a block body of the first to Nth (N is a natural number of 2 or more), and the mth (m is an arbitrary natural number of 1 to N) of the first to Nth block bodies. The block body is configured by fastening a plurality of punching members to each other by a th-th caulking, and has a third magnet insertion hole extending in the height direction and an m-th positioning portion extending in the height direction. To include and
The first to Nth caulking coincides with each other in the height direction, the first to Nth positioning portions coincide with each other in the height direction, and the first to Nth block bodies coincide with each other in the height direction. The nth and n + 1 magnet insertion holes are formed in the circumferential direction between an adjacent at least one set of nth (n is an arbitrary natural number among 1 to N-1) block body and the n + 1th block body. Including laminating the first to Nth block bodies so as to be displaced to obtain a laminated body.
To obtain the laminated body, the nth block body and the n + 1 block body project from the lower end surface of the nth block body so as not to be fastened by the nth and n + 1 caulking. A method for manufacturing a rotor laminated iron core, which comprises accommodating the protrusion of the nth caulking into the recess of the nth + 1 caulking located on the upper end surface of the n + 1 block body. By arranging the first end face plate on the upper end surface of the first block body,
The first The method of claim 5, further comprising arranging the end face plates of 2. To obtain the laminated body, the first to first blocks are obtained so that the first and Nth magnet insertion holes coincide with each other in the height direction between the first block body and the Nth block body. The method of claim 5 or 6, comprising stacking blocks of N (where N is a natural number of 3 or more). The method according to any one of claims 5 to 7, wherein the first to Nth positioning portions are ridges, concave grooves or through holes.

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