JP2021090231A - Laminated iron core of electric machine and electric machine - Google Patents

Abstract

To provide a laminated iron core of an electric machine capable of reducing eddy current loss.SOLUTION: A laminated iron core of an electric machine includes a plurality of laminated core pieces. The plurality of core pieces includes a first core piece and a second core piece adjacent to the first core piece in the lamination direction of the plurality of core pieces. The first core piece and the second core piece have a first portion and a second portion having a board thickness thinner than a board thickness of the first portion, respectively. A surface of the second portion is formed to be recessed in a surface of the first portion on a first surface of the first core piece opposite to the second core piece. The surface of the first portion is formed to project in the surface of the second portion on a second surface of the second core piece opposite to the first core piece. The projected portion is fitted into the recessed portion.SELECTED DRAWING: Figure 7

Description

The present invention relates to a laminated iron core of an electric machine and an electric machine.

Patent Document 1 describes a rotary electric machine provided with a stator core. The stator core has a plurality of divided laminated cores arranged in a ring shape in the circumferential direction. Each of the divided laminated iron cores is composed of a back yoke portion and a teeth portion that protrudes inward in the radial direction from the back yoke portion. Each of the divided laminated iron cores has a structure in which iron core pieces are laminated in the axial direction.

Japanese Unexamined Patent Publication No. 2017-163675

When the number of rotations is increased in the rotary electric machine as described above, the output of the rotary electric machine can be increased and the size can be reduced. However, there is a problem that when the rotation speed of the rotary electric machine increases, the iron loss in the stator core, particularly the eddy current loss, increases.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laminated iron core of an electric machine capable of reducing eddy current loss and an electric machine.

The laminated iron core of the electric machine according to the present invention includes a plurality of laminated iron core pieces, and the plurality of iron core pieces are adjacent to the first iron core piece and the first iron core piece in the stacking direction of the plurality of iron core pieces. A matching second core piece is included, and each of the first core piece and the second core piece has a first portion and a second portion having a plate thickness thinner than that of the first portion. The first portion of the first iron core piece overlaps with the second portion of the second iron core piece when viewed along the stacking direction, and the first iron core piece of the first iron core piece. The second portion overlaps the first portion of the second core piece when viewed along the stacking direction, and is on the first surface of the first core piece facing the second core piece. Is formed with a recess in which the surface of the second portion is concave with respect to the surface of the first portion, and the second surface of the second iron core piece facing the first iron core piece has a concave portion. A convex portion is formed in which the surface of the first portion is convex with respect to the surface of the second portion, and the convex portion is fitted in the concave portion.
The electric machine according to the present invention includes an armature having a laminated iron core of the electric machine according to the present invention, and a field magnet arranged so as to face the armature through a gap.

According to the present invention, it is possible to reduce the eddy current loss in the laminated iron core of the electric machine.

It is sectional drawing which shows the schematic structure of the rotary electric machine which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure of the stator core which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure of one iron core piece in the comparative example of Embodiment 1. FIG. It is sectional drawing which shows the structure in which two iron core pieces in the comparative example of Embodiment 1 are laminated. It is a perspective view which shows the structure of the iron core piece of the divided laminated iron core which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure of another iron core piece of the divided laminated iron core which concerns on Embodiment 1. FIG. It is sectional drawing which shows the structure which two iron core pieces which concern on Embodiment 1 are laminated. It is a perspective view which shows the structure of the divided laminated iron core which concerns on Embodiment 1. FIG. It is a figure which shows the structure which looked at the tip part of the tooth part laminated body of the divided laminated iron core which concerns on Embodiment 1 along the radial direction. FIG. 5 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core according to the first embodiment is cut by a plane perpendicular to the stretching direction of the first portion and the second portion. It is a flowchart which shows the flow of the manufacturing process of the divided laminated iron core which concerns on Embodiment 1. It is a conceptual diagram which shows the flow of the manufacturing process of the divided laminated iron core which concerns on Embodiment 1. FIG. It is sectional drawing which shows the structure of the steel plate sheet after the crushing process in the manufacturing process of the divided laminated iron core which concerns on Embodiment 1. FIG. It is a perspective view which shows the schematic structure of the iron core piece of the divided laminated iron core which concerns on the modification of Embodiment 1. FIG. It is a perspective view which shows the schematic structure of another iron core piece of the divided laminated iron core which concerns on the modification of Embodiment 1. FIG. It is a perspective view which shows the schematic structure of the divided laminated iron core which concerns on the modification of Embodiment 1. FIG. It is a figure which shows the structure which looked at the tip part of the tooth part laminated body of the divided laminated iron core which concerns on the modification of Embodiment 1 along the radial direction. It is sectional drawing which shows the structure which cut | cut a part of the divided laminated iron core which concerns on the modification of Embodiment 1 in the plane perpendicular to the stretching direction of the 1st part and 2nd part. It is a perspective view which shows the structure of the iron core piece of the divided laminated iron core which concerns on Embodiment 2. FIG. It is a perspective view which shows the structure of the iron core piece of the divided laminated iron core which concerns on Embodiment 3. FIG. It is a perspective view which shows the structure of the iron core piece of the divided laminated iron core which concerns on Embodiment 4. FIG. It is a perspective view which shows the structure of the iron core piece of the stator core which concerns on embodiment 5. It is a top view which shows the structure of the iron core piece of the stator core which concerns on Embodiment 6. FIG. 5 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core according to the seventh embodiment is cut by a plane perpendicular to the stretching direction of the first portion and the second portion. FIG. 5 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core according to the eighth embodiment is cut by a plane perpendicular to the stretching direction of the first portion and the second portion. FIG. 5 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core according to the ninth embodiment is cut by a plane perpendicular to the stretching direction of the first portion and the second portion.

Embodiment 1.
The laminated iron core of the electric machine and the electric machine according to the first embodiment will be described. First, the respective configurations of the laminated iron core of the electric machine and the electric machine according to the present embodiment will be described. In this embodiment, as an electric machine, a rotary electric machine including a stator and a rotor is illustrated. The rotary electric machine includes a motor, a generator, and the like. In this specification, the axial direction of the stator core, the radial direction of the stator core, and the circumferential direction of the stator core may be simply referred to as "axial direction", "diameter direction", and "circumferential direction", respectively. is there. In addition, the inner peripheral side of the stator core, the outer peripheral side of the stator core, the inner side of the stator core, and the outer side of the stator core are simply referred to as "inner peripheral side", "outer peripheral side", and "inner side", respectively. And sometimes referred to as "outside".

FIG. 1 is a cross-sectional view showing a schematic configuration of a rotary electric machine according to the present embodiment. As shown in FIG. 1, the rotary electric machine has a housing 10, a stator 20, a rotor 30, and a shaft 40. The housing 10, the stator 20, the rotor 30, and the shaft 40 are arranged in this order from the outer peripheral side to the inner peripheral side. A gap 50 is formed between the inner peripheral surface of the stator 20 and the outer peripheral surface of the rotor 30.

The stator 20 is an armature of a rotating electric machine configured to generate a rotating magnetic field. The rotor 30 is a field of a rotating electric machine. The rotor 30 is rotatably provided on the inner peripheral side of the stator 20. The rotor 30 faces the stator 20 via the gap 50. The stator 20 and rotor 30 are held by the housing 10.

The stator 20 has a stator core 21 that allows magnetic flux to pass through, and a stator winding 22 that is formed by winding a conductor and generates a magnetic field when energized. The stator core 21 is an armature core of a rotary electric machine. The stator core 21 and the stator winding 22 are insulated from each other by an insulating paper (not shown). The winding method of the stator winding 22 may be distributed winding or centralized winding.

The rotor 30 is a permanent magnet type rotor including a rotor iron core 31 through which magnetic flux is passed and a permanent magnet 32. The rotor 30 of the present embodiment is an IPM (Interior Permanent Magnet) type rotor in which a permanent magnet 32 is embedded inside a rotor core 31. The permanent magnet 32 is inserted into each of the plurality of through holes that penetrate the rotor core 31 in the axial direction. The rotor 30 may be an SPM (Surface Permanent Magnet) type rotor in which the permanent magnet 32 is arranged on the outer peripheral surface of the rotor core 31.

The shaft 40 penetrates the rotor core 31 along the central axis of the rotor 30 and is fixed to the rotor core 31 by shrink fitting or press fitting. The shaft 40 is rotatably supported by the housing 10 via a bearing 41 and a bearing 42. The torque of the rotary electric machine is transmitted to the outside via the shaft 40.

The housing 10 is formed in a cylindrical shape using a metal such as iron or aluminum. The plurality of divided laminated iron cores 60 are fitted into the housing 10 in a state of being arranged in an annular shape. As a result, the plurality of divided laminated iron cores 60 are combined to form the annular stator core 21.

FIG. 2 is a perspective view showing the configuration of the stator core 21 according to the present embodiment. As shown in FIG. 2, the stator core 21 has an annular shape as a whole. The stator core 21 is formed by connecting a plurality of divided laminated iron cores 60 arranged in parallel in the circumferential direction. The stator core 21 of the present embodiment has 48 magnetic pole pieces. Each of the divided laminated iron cores 60 constitutes, for example, one magnetic pole piece among the plurality of magnetic pole pieces included in the stator core 21. As will be described later, each of the divided laminated iron cores 60 has a configuration in which a plurality of iron core pieces including the iron core piece 70A and the iron core piece 70B are laminated in the axial direction. That is, the stator core 21 is a laminated iron core having a structure in which a plurality of iron core pieces are laminated. Each of the iron core pieces is formed by using a thin plate which is an electromagnetic steel plate, for example, a steel plate sheet 130 which will be described later. Further, as will be described later, each of the divided laminated iron cores 60 is a back yoke portion laminated body 61 in which the back yoke portions of a plurality of iron core pieces are laminated, and a teeth portion laminated body in which the teeth portions of the plurality of iron core pieces are laminated. 62 and.

The configuration of the iron core piece of the present embodiment will be described in comparison with the configuration of the comparative example. FIG. 3 is a perspective view showing the configuration of one iron core piece 170 in the comparative example of the present embodiment. FIG. 4 is a cross-sectional view showing a configuration in which two iron core pieces 170 are laminated in a comparative example of the present embodiment.

As shown in FIGS. 3 and 4, the iron core piece 170 of the comparative example has a back yoke portion 171 and a teeth portion 172, and is formed in a flat plate shape. One surface of the iron core piece 170 facing upward in FIGS. 3 and 4 and the other surface of the iron core piece 170 facing downward in FIGS. 3 and 4 are both formed flat. There is. The iron core piece 170 has a substantially uniform plate thickness t11 as a whole. The plate thickness t11 is, for example, 0.35 mm. In this case, the thickness of the two laminated iron core pieces 170 is 0.70 mm (= 0.35 mm × 2). The plate thickness t11 is the same as the plate thickness at the time of purchasing the iron core piece 170 or the plate thickness at the time of purchasing the steel plate sheet 130 described later. In the comparative example, a split laminated iron core is formed by laminating a plurality of iron core pieces 170 having the same configuration.

FIG. 5 is a perspective view showing the configuration of the iron core piece 70A of the divided laminated iron core 60 according to the present embodiment. FIG. 6 is a perspective view showing the configuration of another iron core piece 70B of the divided laminated iron core 60 according to the present embodiment. FIG. 7 is a cross-sectional view showing a configuration in which the iron core pieces 70A and the iron core pieces 70B according to the present embodiment are laminated. FIG. 7 shows a cross section of the iron core piece 70A and the iron core piece 70B cut in a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92. In the present embodiment, the iron core pieces 70A and the iron core pieces 70B are alternately laminated to form each of the plurality of divided laminated iron cores 60 shown in FIG.

As shown in FIGS. 5 to 7, each of the iron core piece 70A and the iron core piece 70B has a back yoke portion 71 and a teeth portion 72, similarly to the iron core piece 170 of the comparative example, and has a flat plate shape as a whole. Is formed in. The back yoke portion 71 extends along one direction perpendicular to the stacking direction of the iron core piece 70A and the iron core piece 70B. The tooth portion 72 protrudes from the center of the back yoke portion 71 in the stretching direction of the back yoke portion 71 in a direction perpendicular to both the stacking direction of the iron core piece 70A and the iron core piece 70B and the stretching direction of the back yoke portion 71. .. The iron core piece 70A and the iron core piece 70B have the same planar shape.

In the stator core 21 shown in FIG. 2, the stretching direction of the back yoke portion 71 corresponds to the circumferential direction of the stator core 21 or the tangential direction in the circumferential direction. In the stator core 21 shown in FIG. 2, the protruding direction of the teeth portion 72 corresponds to the inside in the radial direction of the stator core 21. The stacking direction of the iron core piece 70A and the iron core piece 70B corresponds to the axial direction of the stator core 21 in the stator core 21 shown in FIG.

The iron core piece 70A has a plurality of first portions 91 having a plate thickness t1 and a plurality of second portions 92 having a plate thickness t2 thinner than the plate thickness t1 (t1> t2). For example, the plate thickness t1 is 0.35 mm, and the plate thickness t2 is 0.25 mm. The plate thickness t1 is, for example, the same as the plate thickness at the time of purchasing the iron core piece 70A or the plate thickness at the time of purchasing the steel plate sheet 130 described later. The second portion 92 is formed by crushing the steel plate sheet 130, which will be described later, in the plate thickness direction.

Each of the first portions 91 extends in a strip shape along the protruding direction of the tooth portion 72, that is, the radial direction of the stator core 21. The plurality of first portions 91 are arranged in parallel with each other at intervals. Each of the second portions 92 is arranged between two adjacent first portions 91. Each of the second portions 92, like each of the first portions 91, extends in a band shape along the protruding direction of the teeth portion 72. The parallel direction in which the first portion 91 and the second portion 92 are parallel is the extending direction of the back yoke portion 71, that is, the circumferential direction of the stator core 21. The plurality of first portions 91 and the plurality of second portions 92 are arranged alternately in the stretching direction of the back yoke portion 71.

On the upper surface of the iron core piece 70A facing upward in FIGS. 5 and 7, each surface 92a of the second portion 92 is concave with respect to the plane 111 including each surface 91a of the first portion 91. It is formed to be. As a result, a recess 102 is formed in the second portion 92 of the upper surface of the iron core piece 70A. A convex portion 101 that is convex with respect to the concave portion 102 is formed on the first portion 91 of the upper surface of the iron core piece 70A.

Even on the lower surface of the iron core piece 70A facing downward in FIGS. 5 and 7, each surface 92b of the second portion 92 is concave with respect to the plane 112 including each surface 91b of the first portion 91. It is formed so as to be. As a result, a recess 104 is formed in the second portion 92 of the lower surface of the iron core piece 70A. A convex portion 103 that is convex with respect to the concave portion 104 is formed on the first portion 91 of the lower surface of the iron core piece 70A. That is, on both the upper surface and the lower surface of the iron core piece 70A, a convex portion is formed in the first portion 91, and a concave portion is formed in the second portion 92.

The iron core piece 70B has a plurality of first portions 93 having a plate thickness t3 and a plurality of second portions 94 having a plate thickness t4 thinner than the plate thickness t3 (t3> t4). In the present embodiment, the difference (t3-t4) between the plate thickness t3 and the plate thickness t4 is the same as the difference (t1-t2) between the plate thickness t1 and the plate thickness t2 (t3-t4 = t1-t2). ). Further, in the present embodiment, the plate thickness t3 is the same as the plate thickness t1 (t3 = t1), and the plate thickness t4 is the same as the plate thickness t2 (t4 = t2). The plate thickness t3 is the same as the plate thickness at the time of purchasing the iron core piece 70B or the plate thickness at the time of purchasing the steel plate sheet 130 described later.

Here, the term "identical" in the specification of the present application includes not only exactly the same but also substantially the same range that can be regarded as substantially the same in consideration of common general technical knowledge.

Each of the first portions 93 extends in a strip shape along the protruding direction of the tooth portion 72, that is, the radial direction of the stator core 21. The plurality of first portions 93 are arranged in parallel with each other at intervals. Each of the second portions 94 is arranged between two adjacent first portions 93. Each of the second portions 94, like each of the first portions 93, extends in a band shape along the protruding direction of the teeth portion 72. The parallel direction in which the first portion 93 and the second portion 94 are parallel is the extending direction of the back yoke portion 71, that is, the circumferential direction of the stator core 21. The plurality of first portions 93 and the plurality of second portions 94 are arranged alternately in the stretching direction of the back yoke portion 71.

On the upper surface of the iron core piece 70B facing upward in FIGS. 6 and 7, each surface 94a of the second portion 94 is concave with respect to the plane 113 including each surface 93a of the first portion 93. It is formed to be. As a result, a recess 106 is formed in the second portion 94 of the upper surface of the iron core piece 70B. A convex portion 105 that is convex with respect to the concave portion 106 is formed on the first portion 93 of the upper surface of the iron core piece 70B.

Even on the lower surface of the iron core piece 70B facing downward in FIGS. 6 and 7, each surface 94b of the second portion 94 is concave with respect to the plane 114 including each surface 93b of the first portion 93. It is formed so as to be. As a result, a recess 108 is formed in the second portion 94 of the lower surface of the iron core piece 70B. A convex portion 107 that is convex with respect to the concave portion 108 is formed on the first portion 93 of the lower surface of the iron core piece 70B. That is, on both the upper surface and the lower surface of the iron core piece 70B, a convex portion is formed in the first portion 93, and a concave portion is formed in the second portion 94.

As will be described later with reference to FIG. 10, the width W1 of the first portion 91 of the iron core piece 70A is the same as the width W4 of the second portion 94 of the iron core piece 70B. Further, the width W2 of the second portion 92 of the iron core piece 70A is the same as the width W3 of the first portion 93 of the iron core piece 70B.

When a plurality of iron core pieces are laminated, the iron core pieces 70A and the iron core pieces 70B are arranged so as to be adjacent to each other in the stacking direction. When the laminated iron core pieces 70A and the iron core pieces 70B are viewed along the stacking direction, the first portion 91 of the iron core piece 70A is arranged so as to overlap with the second portion 94 of the iron core piece 70B. Further, when viewed along the stacking direction, the first portion 91 of the iron core piece 70A is formed within the formation range of the second portion 94 of the iron core piece 70B. Therefore, the convex portion 103 formed in the first portion 91 of the iron core piece 70A is fitted with the concave portion 106 formed in the second portion 94 of the iron core piece 70B. That is, the convex portion 103 is fitted in the concave portion 106.

Further, when viewed along the stacking direction, the first portion 93 of the iron core piece 70B is arranged so as to overlap with the second portion 92 of the iron core piece 70A. Further, when viewed along the stacking direction, the first portion 93 of the iron core piece 70B is formed within the formation range of the second portion 92 of the iron core piece 70A. Therefore, the convex portion 105 formed in the first portion 93 of the iron core piece 70B is fitted with the concave portion 104 formed in the second portion 92 of the iron core piece 70A. That is, the convex portion 105 is fitted in the concave portion 104.

As a result, the thickness of the laminated iron core pieces 70A and iron core pieces 70B becomes t1 + t4 or t2 + t3. Assuming that the plate thickness t1 and the plate thickness t3 are the same as the plate thickness t11 of the iron core piece 170 of the comparative example, the thickness of the laminated iron core piece 70A and the iron core piece 70B is the thickness of the two iron core pieces laminated in the comparative example. It is thinner than the thickness of 170 (2 × t11). For example, the thickness of the laminated iron core pieces 70A and the iron core pieces 70B is 0.60 mm (= 0.35 mm + 0.25 mm). In the present embodiment, the plate thickness t1 and the plate thickness t3 are both set to 0.35 mm, but the plate thickness t1 and the plate thickness t3 have other dimensions such as 0.5 mm, 0.25 mm, and 0.23 mm. It is also possible to. By matching each of the plate thickness t1 and the plate thickness t3 to the standard of the thin plate, a thin plate in which the iron core piece 70A and the iron core piece 70B are punched can be easily obtained at low cost.

FIG. 8 is a perspective view showing the configuration of the divided laminated iron core 60 according to the present embodiment. FIG. 9 is a diagram showing a configuration in which the tip portion 62a of the tooth portion laminated body 62 of the divided laminated iron core 60 according to the present embodiment is viewed along the radial direction.

As shown in FIGS. 8 and 9, the divided laminated iron core 60 has a configuration in which a plurality of iron core pieces 70A and a plurality of iron core pieces 70B are alternately laminated one by one. The plurality of laminated iron core pieces 70A and the plurality of iron core pieces 70B may be fixed by adhesion, may be fixed by welding, or may be fixed by mold fixing using a resin. Alternatively, the plurality of laminated iron core pieces 70A and the plurality of iron core pieces 70B may be fixed by caulking using a half punched portion formed on each iron core piece, or may be fastened using a fastening member such as a rivet. It may be fixed by.

The divided laminated iron core 60 has a back yoke portion laminated body 61 and a teeth portion laminated body 62. The back yoke portion laminated body 61 has a configuration in which the back yoke portions 71 of the plurality of iron core pieces 70A and the plurality of iron core pieces 70B are laminated. The tooth portion laminated body 62 has a configuration in which the tooth portions 72 of the plurality of iron core pieces 70A and the plurality of iron core pieces 70B are laminated. The back yoke portion laminated body 61 extends along the circumferential direction. The tooth portion laminated body 62 protrudes inward in the radial direction from the back yoke portion laminated body 61. A tip portion 62a facing the outer peripheral surface of the rotor 30 is formed at an end portion on the inner side in the radial direction of the tooth portion laminated body 62. The tip portion 62a is formed, for example, in a planar shape perpendicular to the radial direction or in a cylindrical surface shape along the outer peripheral surface of the rotor 30.

FIG. 10 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core 60 according to the present embodiment is cut in a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92. The left-right direction in FIG. 10 represents the parallel direction of the first portion 91 and the second portion 92. The vertical direction in FIG. 10 represents the stacking direction of the iron core piece 70A and the iron core piece 70B. FIG. 10 shows a cross section parallel to the cross section shown in FIG.

In the cross section shown in FIG. 10, the recess 102 and the recess 104 formed in the iron core piece 70A both have a rectangular cross-sectional shape. The convex portion 101 and the convex portion 103 formed on the iron core piece 70A both have a rectangular cross-sectional shape. Further, in the same cross section, the recess 106 and the recess 108 formed in the iron core piece 70B both have a rectangular cross-sectional shape. Both the convex portion 105 and the convex portion 107 formed on the iron core piece 70B have a rectangular cross-sectional shape.

Since both the convex portion and the concave portion have a rectangular cross-sectional shape, when the iron core piece 70A and the iron core piece 70B are laminated, the iron core piece 70A and the iron core piece 70B can be easily positioned. be able to. Further, since the iron core piece 70A and the iron core piece 70B are easily fitted into each other, the iron core piece 70A and the iron core piece 70B can be temporarily fixed until they are fixed by adhesion, welding, or the like. Further, since the iron core piece 70A and the iron core piece 70B are fitted at a plurality of places, it is possible to eliminate the need for fixing by adhesion, welding, or the like depending on the application. By reducing the width dimension of these convex portions and concave portions, it is possible to further increase the number of locations where fitting occurs between the iron core piece 70A and the iron core piece 70B.

In the cross section shown in FIG. 10, the width W1 of the first portion 91 of the iron core piece 70A, that is, the width of each of the convex portion 101 and the convex portion 103 is the width W2 of the second portion 92 of the iron core piece 70A, that is, the concave portion 102 and the concave portion. It is the same as each width of 104. Further, in the same cross section, the width W3 of the first portion 93 of the iron core piece 70B, that is, the width of each of the convex portion 105 and the convex portion 107 is the width W4 of the second portion 94 of the iron core piece 70B, that is, the concave portion 106 and the concave portion 108. Is the same as each width of. Further, the width W1, the width W2, the width W3 and the width W4 are all the same (W1 = W2 = W3 = W4). As a result, the width W1 of the first portion 91 of the iron core piece 70A and the width W4 of the second portion 94 of the iron core piece 70B become the same, and the width W2 of the second portion 92 of the iron core piece 70A and the first portion of the iron core piece 70B. The width W3 of 93 is the same. Therefore, when the iron core piece 70A and the iron core piece 70B are laminated, the gap formed between the iron core piece 70A and the iron core piece 70B can be reduced. Therefore, the occupancy rate of the iron core in the divided laminated iron core 60 can be increased.

In the cross section shown in FIG. 10, a plurality of repeating patterns 121 formed by the first portion 91 and the second portion 92 adjacent to each other are formed on the iron core piece 70A. The plurality of repeating patterns 121 of the iron core piece 70A are arranged at a pitch P1 along the parallel direction of the first portion 91 and the second portion 92. The pitch P1 is the same as the sum of the width W1 and the width W2 in the iron core piece 70A (P1 = W1 + W2).

In the same cross section, the iron core piece 70B is formed with a plurality of repeating patterns 122 each composed of a first portion 93 and a second portion 94 adjacent to each other. The plurality of repeating patterns 122 of the iron core piece 70B are arranged at a pitch P2 along the parallel direction of the first portion 93 and the second portion 94. The pitch P2 is the same as the sum of the widths W3 and W4 in the iron core piece 70B (P2 = W3 + W4), and is also the same as the pitch P1 (P2 = P1).

The repeating pattern 121 of the iron core piece 70A and the repeating pattern 122 of the iron core piece 70B are arranged so as to be offset by a deviation width P3. The deviation width P3 corresponds to half of pitch P1 and pitch P2, that is, half pitch (P3 = P1 / 2 = P2 / 2). That is, the first portion 91 of the iron core piece 70A and the first portion 93 of the iron core piece 70B are arranged so as to be offset by a half pitch. Similarly, the second portion 92 of the iron core piece 70A and the second portion 94 of the iron core piece 70B are arranged so as to be offset by a half pitch. By doing so, it is possible to make it difficult for a gap to be formed between the iron core piece 70A and the iron core piece 70B. Further, in the manufacturing process of the split laminated iron core 60 described later, by matching the operation timings of the crusher 220 and the press machine 230, the split laminated iron core 60 is continuously manufactured without stopping the crusher 220 and the press machine 230. can do. Therefore, the productivity of the divided laminated iron core 60 can be increased.

Generally, the iron loss Wi generated in the rotary electric machine is expressed by the following equation.
Wi = Wh + We
Here, Wh is a hysteresis loss and We is an eddy current loss.

The eddy current loss We is expressed by the following equation.
We = ke / ρ × t ² × f ² × B ²
Here, ke is a coefficient, ρ is the resistivity of the thin plate, t is the plate thickness of the thin plate, f is the rotation speed, and B is the magnetic flux density. That is, in order to reduce the eddy current loss We, it is effective to increase the resistivity ρ, reduce the plate thickness t, and insulate the surface of the thin plate to block the eddy current path. is there. For example, when the plate thickness t is reduced, the eddy current loss We becomes smaller in proportion to the square of the plate thickness t.

In the present embodiment, the plate thickness t2 of at least a part of the iron core piece 70A and the plate thickness t4 of at least a part of the iron core piece 70B are set to the plate thickness t11 of the iron core piece 170 of the comparative example shown in FIGS. 3 and 4. Can be made thinner than. Thereby, the eddy current generated in at least a part of each of the iron core piece 70A and the iron core piece 70B can be suppressed.

Next, a method for manufacturing a laminated iron core of an electric machine and a method for manufacturing an electric machine according to the present embodiment will be described. FIG. 11 is a flowchart showing the flow of the manufacturing process of the divided laminated iron core 60 according to the present embodiment. FIG. 12 is a conceptual diagram showing the flow of the manufacturing process of the divided laminated iron core 60 according to the present embodiment. FIG. 12 also shows a schematic configuration of a manufacturing apparatus 200 for manufacturing the divided laminated iron core 60 according to the present embodiment. Hereinafter, the flow of the manufacturing process of the divided laminated iron core 60 and the configuration of the manufacturing apparatus 200 will be described with reference to FIGS. 11 and 12.

As shown in FIG. 11, the manufacturing process of the divided laminated iron core 60 includes at least a crushing step and a punching step executed after the crushing step.

As shown in FIG. 12, the manufacturing apparatus 200 for manufacturing the divided laminated iron core 60 has a steel plate supply device 210, a crushing machine 220, and a press machine 230 in this order in the flow of the manufacturing process. The steel plate supply device 210, the crushing machine 220, and the press machine 230 constitute a series of continuous production lines in this order. The crushing machine 220 executes the crushing process, and the press machine 230 executes the punching process. As a result, the crushing process and the punching process are performed by a series of production lines.

The steel plate supply device 210 is configured to hold the steel plate sheet 130 wound in a hoop shape. The steel plate sheet 130 is formed by using a thin plate which is a non-oriented electrical steel plate. Further, the steel plate supply device 210 has a feed device for feeding the strip-shaped steel plate sheet 130 to the right in FIG. As a result, the strip-shaped steel plate sheet 130 is supplied from the steel plate supply device 210 to the crusher 220. The plate thickness of the steel plate sheet 130 supplied to the crusher 220 is the same as the plate thickness of the steel plate sheet 130 in the initial state wound in a hoop shape.

In the crusher 220, the crushing step of step S1 of FIG. 11 is executed. The crushing step is a step of crushing a part of the steel sheet sheet 130. The crusher 220 is configured to press and crush a part of the steel plate sheet 130 supplied from the steel plate supply device 210 in the plate thickness direction. The crusher 220 drives the lower table 221 arranged below the steel plate sheet 130, the upper table 222 arranged above the steel plate sheet 130, and the upper table 222 in the vertical direction with respect to the lower table 221 (not shown). It has a drive mechanism and. The lower table 221 is provided with a tool unit 223. The upper table 222 is provided with a tool unit 224. The tool portion 223 and the tool portion 224 face each other with the steel plate sheet 130 interposed therebetween.

FIG. 13 is a cross-sectional view showing the configuration of the steel sheet sheet 130 after the crushing step in the manufacturing step of the divided laminated iron core according to the present embodiment. As shown in FIG. 13, when a part of the steel plate sheet 130 is crushed by the crusher 220, the thin portion 131 having a plate thickness t6 thinner than the plate thickness t5 of the steel plate sheet 130 in the initial state in the part. Is formed (t5> t6). The thin portion 131 becomes the second portion 92 of the iron core piece 70A or the second portion 94 of the iron core piece 70B.

On the other hand, the portion of the steel plate sheet 130 other than the thin portion 131 is maintained at the initial plate thickness t5. This portion becomes a thick portion 132 having a plate thickness t5 thicker than the plate thickness t6 of the thin portion 131. The thick portion 132 becomes the first portion 91 of the iron core piece 70A or the first portion 93 of the iron core piece 70B.

Although not shown, the tool portion 223 has a protruding portion protruding in the direction toward the lower surface of the steel plate sheet 130. Similarly, the tool portion 224 has a protruding portion protruding in the direction toward the upper surface of the steel plate sheet 130. These protrusions have a planar shape that is symmetrical with respect to the steel plate sheet 130. The thin-walled portion 131 is formed by crushing a part of the steel plate sheet 130 from both the upper side and the lower side by the protruding portion of the tool portion 223 and the protruding portion of the tool portion 224. As a result, recesses are formed in the thin-walled portion 131 on both the upper surface and the lower surface of the steel sheet sheet 130. Since each of the tool portion 223 and the tool portion 224 need only have a protruding portion protruding in one direction, the structure can be simplified as compared with a general mold.

When a plurality of thin-walled portions 131 are formed on the steel plate sheet 130, a plurality of protruding portions may be provided on each of the tool portion 223 and the tool portion 224. Thereby, a plurality of thin-walled portions 131 can be formed on the steel plate sheet 130 by one pressurization by the crusher 220. Therefore, even when a plurality of thin-walled portions 131 are formed on the steel sheet sheet 130, it is possible to prevent the tact time of the crushing process from becoming long.

However, when forming a plurality of thin-walled portions 131 on the steel sheet sheet 130, it is also possible to form the thin-walled portions 131 one by one. In this case, regardless of the number of thin-walled portions 131 formed on the steel plate sheet 130, only one protruding portion needs to be provided for each of the tool portion 223 and the tool portion 224.

For example, when a plurality of thin-walled portions 131 are formed on the steel plate sheet 130 at a constant pitch, the thin-walled portions 131 at the first location are first formed, and then the steel plate sheet 130 is fed by one pitch to the second location. The thin-walled portion 131 is formed. After that, the feeding of the steel plate sheet 130 and the formation of the thin-walled portion 131 are repeated to form the required number of thin-walled portions 131 on the steel plate sheet 130. In this case, since the number of protrusions in each of the tool unit 223 and the tool unit 224 can be reduced, each of the tool unit 223 and the tool unit 224 can have a simpler structure, and the capital investment of the crusher 220 can be achieved. Can be suppressed. As a result, the manufacturing cost of the split laminated iron core 60 can be reduced.

In the crushing process, the steel sheet sheet 130 is not cut. Therefore, the steel plate sheet 130 on which the thin-walled portion 131 is formed is fed from the crushing machine 220 to the press machine 230 in the next process by using the above-mentioned feeding device.

In the press machine 230, the punching step of step S2 of FIG. 11 is executed. The punching step is a step of punching each of the iron core piece 70A and the iron core piece 70B from the steel plate sheet 130. As shown in FIG. 12, the press machine 230 drives the die 231 arranged below the steel plate sheet 130, the punch 232 arranged above the steel plate sheet 130, and the punch 232 in the vertical direction with respect to the die 231. It has a drive mechanism (not shown). The punch 232 has a planar shape similar to that of both the iron core piece 70A and the iron core piece 70B. The punch 232 is driven by a drive mechanism so as to fit inside the die 231. As a result, the press machine 230 can punch out the iron core piece 70A or the iron core piece 70B one by one from the steel plate sheet 130. The punched iron core piece 70A or the iron core piece 70B is pulled out into the internal space 233 of the die 231.

From the steel plate sheet 130, a plurality of iron core pieces 70A and a plurality of iron core pieces 70B are alternately punched one by one. That is, in the press machine 230, the step of punching one iron core piece 70A from the steel plate sheet 130 and the step of punching one iron core piece 70B from the steel plate sheet 130 are alternately and repeatedly executed. As a result, the plurality of iron core pieces 70A and the plurality of iron core pieces 70B are alternately stacked one by one in the internal space 233 of the die 231. In the manufacturing process shown in FIG. 12, since the steel plate sheet 130 is continuously sent to the press machine 230, a plurality of iron core pieces 70A and a plurality of iron core pieces 70B are stacked one after another in the internal space 233. Thereby, the productivity of the iron core piece 70A, the iron core piece 70B, and the divided laminated iron core 60 in which these are laminated can be improved.

Further, in the punching step, the feed pitch of the steel plate sheet 130 when punching the iron core piece 70A and the feed pitch of the steel plate sheet 130 when punching the iron core piece 70B are made different by, for example, the deviation width P3 shown in FIG. It may be. As a result, each of the iron core piece 70A and the iron core piece 70B can be easily punched out from the steel plate sheet 130, and the productivity of the iron core piece 70A and the iron core piece 70B can be improved.

Further, each of the crushing machine 220 and the pressing machine 230 may be configured so that the positions can be moved along the feeding direction of the steel plate sheet 130. By adjusting the feed pitch of the steel plate sheet 130 while adjusting the positions of the crusher 220 and the press 230, continuous machining of the iron core piece 70A and the iron core piece 70B can be easily performed.

Although not shown, after the punching step, a stacking and fixing step of fixing the plurality of iron core pieces 70A and the plurality of iron core pieces 70B stacked alternately is executed. In the stacking and fixing step, for example, a plurality of alternately stacked iron core pieces 70A and a plurality of iron core pieces 70B are adhered by an adhesive. In this case, an adhesive layer is formed between the iron core pieces 70A and the iron core pieces 70B that are adjacent to each other. As a result, the iron core pieces 70A and the iron core pieces 70B adjacent to each other are fixed via the adhesive layer, and the divided laminated iron core 60 is produced. As a method of applying the adhesive, there is a method of immersing a plurality of alternately stacked iron core pieces 70A and a plurality of iron core pieces 70B in a thermosetting adhesive placed in a tank, and then heating in a heating furnace. .. As a result, the adhesive is cured, and the plurality of iron core pieces 70A and the plurality of iron core pieces 70B are fixed. Further, as a method other than adhesion, there is a method in which a plurality of iron core pieces 70A and a plurality of iron core pieces 70B stacked alternately are put into a mold for resin molding, and the resin is poured into the mold. As a result, the plurality of iron core pieces 70A and the plurality of iron core pieces 70B are integrated together with the resin.

A required number, for example, 48 of the divided laminated iron cores 60 produced in this manner is prepared. By connecting these divided laminated iron cores 60 in parallel in an annular shape, the stator core 21 of a rotary electric machine is manufactured. When connecting the plurality of divided laminated iron cores 60, welding or adhesion may be used, or fixing by resin molding may be used. The stator 20 is manufactured by attaching the stator winding 22 to the stator core 21. The stator windings 22 may be attached to each of the plurality of divided laminated iron cores 60, and then the divided laminated iron cores 60 may be connected in parallel in an annular shape.

Further, the rotary electric machine shown in FIG. 1 is obtained through a step of inserting the rotor 30 and the shaft 40 into the inner peripheral side of the stator 20.

In the present embodiment, the punching step is executed after the crushing step. As a result, even if the steel sheet sheet 130 is deformed or dimensionally changed in the crushing process, the iron core piece 70A and the iron core piece 70B can be punched out with an accuracy corresponding to the processing accuracy of the press machine 230 in the punching process. Therefore, the iron core piece 70A and the iron core piece 70B having high dimensional accuracy and geometric accuracy can be easily obtained. As a result, the dimensional accuracy and the geometric accuracy of the divided laminated iron core 60 manufactured by using the iron core piece 70A and the iron core piece 70B can be improved.

If the punching process is executed before the crushing step, even if the dimensional accuracy and geometrical accuracy of the iron core piece 70A and the iron core piece 70B are secured in the punching step, the dimensional accuracy and geometry are secured in the subsequent crushing step. The accuracy will decrease. Therefore, after the crushing step, a step for improving the dimensional accuracy and the geometric accuracy of each of the iron core piece 70A and the iron core piece 70B may be further required. Further, since it is necessary to send the iron core pieces 70A and the iron core pieces 70B punched out in the punching process one by one to the crushing process, it takes time to transport the iron core pieces 70A and the iron core pieces 70B from the punching process to the crushing process. It ends up.

Each of the iron core piece 70A and the iron core piece 70B of the present embodiment has a first portion and a second portion as two portions having different plate thicknesses. However, each of the iron core piece 70A and the iron core piece 70B may have three or more portions having different plate thicknesses from each other. That is, each of the iron core piece 70A and the iron core piece 70B has a first portion, a second portion having a plate thickness thinner than the plate thickness of the first portion, and a second portion having a plate thickness thinner than the plate thickness of the second portion. It may have three parts and.

Further, each of the concave portion and the convex portion formed in each of the iron core piece 70A and the iron core piece 70B of the present embodiment has a rectangular cross-sectional shape. However, the cross-sectional shape of these concave portions and convex portions is not limited to the rectangular shape, and may be other shapes.

FIG. 14 is a perspective view showing a schematic configuration of an iron core piece 70A of a divided laminated iron core 60 according to a modified example of the present embodiment. FIG. 15 is a perspective view showing a schematic configuration of another iron core piece 70B of the divided laminated iron core 60 according to the modified example of the present embodiment. FIG. 16 is a perspective view showing a schematic configuration of a divided laminated iron core 60 according to a modified example of the present embodiment. FIG. 17 is a diagram showing a configuration in which the tip portion 62a of the tooth portion laminated body 62 of the divided laminated iron core 60 according to the modified example of the present embodiment is viewed along the radial direction. FIG. 18 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core 60 according to the modified example of the present embodiment is cut by a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92.

As shown in FIGS. 14 and 16 to 18, each of the upper surface and the lower surface of the iron core piece 70A according to this modified example is formed in a wavy shape having peaks and valleys. That is, in the cross section shown in FIG. 18, each of the upper surface and the lower surface of the iron core piece 70A has a wavy cross-sectional shape. For example, each of the upper surface and the lower surface of the iron core piece 70A has a round wavy cross-sectional shape without corners. The peaks and valleys of the round wave are both formed in an arc shape. On both the upper surface and the lower surface of the iron core piece 70A, the mountain portion is formed in the first portion 91, and the valley portion is formed in the second portion 92. The mountain portion on the upper surface of the iron core piece 70A is a convex portion 101. The valley on the upper surface of the iron core piece 70A is a recess 102. The mountain portion on the lower surface of the iron core piece 70A is a convex portion 103. The valley on the lower surface of the iron core piece 70A is a recess 104. The convex portion 101, the concave portion 102, the convex portion 103, and the concave portion 104 all have an arcuate cross-sectional shape.

As shown in FIGS. 15 to 18, each of the upper surface and the lower surface of the iron core piece 70B is formed in a wavy shape having peaks and valleys. That is, in the cross section shown in FIG. 18, each of the upper surface and the lower surface of the iron core piece 70B has a wavy cross-sectional shape. For example, each of the upper surface and the lower surface of the iron core piece 70B has a round wavy cross-sectional shape without corners. The peaks and valleys of the round wave are both formed in an arc shape. On both the upper surface and the lower surface of the iron core piece 70B, the mountain portion is formed in the first portion 93, and the valley portion is formed in the second portion 94. The mountain portion on the upper surface of the iron core piece 70B is a convex portion 105. The valley on the upper surface of the iron core piece 70B is a recess 106. The mountain portion on the lower surface of the iron core piece 70B is a convex portion 107. The valley on the lower surface of the iron core piece 70B is a recess 108. The convex portion 105, the concave portion 106, the convex portion 107, and the concave portion 108 all have an arcuate cross-sectional shape.

In the configuration of this modification, when the iron core piece 70A and the iron core piece 70B are laminated, one convex portion of the iron core piece 70A and the iron core piece 70B and the other concave portion of the iron core piece 70A and the iron core piece 70B fit into each other. .. As a result, the relative positions of the iron core piece 70A and the iron core piece 70B in the left-right direction in FIG. 18 are autonomously adjusted. Therefore, when the iron core piece 70A and the iron core piece 70B are laminated, it is possible to suppress the occurrence of misalignment between the iron core piece 70A and the iron core piece 70B. As a result, the alignment when laminating the iron core piece 70A and the iron core piece 70B can be simplified, so that the work of laminating the iron core piece 70A and the iron core piece 70B can be made more efficient, and the productivity of the divided laminated iron core 60 is improved. be able to.

Further, in the configuration of this modification, the cross-sectional shape of each of the protruding portions of the tool portion 223 and the tool portion 224 can be made round. As a result, the surface pressure applied to the steel sheet sheet 130 by each of the tool unit 223 and the tool unit 224 can be increased, so that the pressurizing load required in the crushing process is reduced and the capital investment of the crushing machine 220 is suppressed. be able to.

Further, since the cross-sectional shape of each of the protruding portions of the tool portion 223 and the tool portion 224 can be made round, the stress concentration in each of the tool portion 223 and the tool portion 224 can be relaxed. Therefore, the durability of the tool unit 223 and the tool unit 224 can be improved.

As described above, the divided laminated iron core 60 according to the present embodiment includes a plurality of laminated iron core pieces. The plurality of iron core pieces include an iron core piece 70A and an iron core piece 70B adjacent to the iron core piece 70A in the stacking direction of the plurality of iron core pieces. The iron core piece 70A has a first portion 91 and a second portion 92 having a plate thickness t2 thinner than the plate thickness t1 of the first portion 91. The iron core piece 70B has a first portion 93 and a second portion 94 having a plate thickness t4 thinner than the plate thickness t3 of the first portion 93. The first portion 91 of the iron core piece 70A overlaps with the second portion 94 of the iron core piece 70B when viewed along the stacking direction. The second portion 92 of the iron core piece 70A overlaps with the first portion 93 of the iron core piece 70B when viewed along the stacking direction. On the first surface of the iron core piece 70A facing the iron core piece 70B, for example, on the lower surface of the iron core piece 70A in FIG. 7, the surface 92b of the second portion 92 is concave with respect to the surface 91b of the first portion 91. A recess 104 is formed. On the second surface of the iron core piece 70B facing the iron core piece 70A, for example, on the upper surface of the iron core piece 70B in FIG. 7, the surface 93a of the first portion 93 is convex with respect to the surface 94a of the second portion 94. A convex portion 105 is formed. The convex portion 105 is fitted in the concave portion 104. Here, the divided laminated iron core 60 is an example of the laminated iron core of an electric machine. The iron core piece 70A is an example of the first iron core piece. The iron core piece 70B is an example of the second iron core piece.

According to this configuration, the plate thickness t2 of the second portion 92 can be made thinner than the plate thickness t1 of the first portion 91. Since the eddy current loss is proportional to the square of the plate thickness of the iron core piece, according to the above configuration, the eddy current loss in the second portion 92 of the iron core piece 70A can be reduced. Similarly, according to the above configuration, the eddy current loss in the second portion 94 of the iron core piece 70B can be reduced. Therefore, according to the above configuration, the eddy current loss of the divided laminated iron core 60 can be reduced. As a result, the iron loss generated in the rotary electric machine can be reduced, so that the efficiency of the rotary electric machine can be improved.

In the present embodiment, the plate thickness t1 of the first portion 91 is the same as the plate thickness at the time of purchase of the steel plate sheet 130. Further, the second portion 92 having a plate thickness t2 thinner than the plate thickness t1 is formed by crushing the steel plate sheet 130. Therefore, the iron core piece 70A can be manufactured by using the steel plate sheet 130 which can be easily obtained at low cost. Similarly, the iron core piece 70B can be manufactured using a steel plate sheet 130 that is easily available at low cost. Therefore, according to the present embodiment, it is possible to reduce the eddy current loss of the divided laminated iron core 60 while suppressing the material cost.

Further, according to the above configuration, the iron core piece 70A and the iron core piece 70B can be manufactured by using the same manufacturing apparatus 200. Therefore, the manufacturing cost of the divided laminated iron core 60 can be reduced, and a cheaper electric machine can be realized.

In the divided laminated iron core 60 according to the present embodiment, the first surface of the iron core piece 70A is formed in a wavy shape having a valley portion serving as a recess 104. The second surface of the iron core piece 70B is formed in a wavy shape having a mountain portion serving as a convex portion 105. According to this configuration, the cross-sectional shape of each of the protruding portions of the tool portion 223 and the tool portion 224 can be made round. As a result, the pressurizing load required in the crushing process is reduced, so that the capital investment of the crushing machine 220 can be suppressed. Further, since the stress concentration generated in the tool unit 223 and the tool unit 224 can be relaxed, the durability of the tool unit 223 and the tool unit 224 can be improved. Further, when the iron core piece 70A and the iron core piece 70B are laminated, it is possible to prevent the iron core piece 70A and the iron core piece 70B from being displaced from each other.

In the divided laminated iron core 60 according to the present embodiment, each of the iron core piece 70A and the iron core piece 70B has a back yoke portion 71 and a teeth portion 72 protruding from the back yoke portion 71. The second portion 92 and the second portion 94 of the teeth portion 72 extend along the projecting direction of the teeth portion 72.

In the rotary electric machine, the magnetic flux entering the stator core 21 from the rotor 30 flows in the radial direction of the teeth portion 72, that is, in the protruding direction of the teeth portion 72. Therefore, according to the above configuration, the second portion 92 and the second portion 94 in the tooth portion 72 can be formed long along the direction in which the magnetic flux flows. Therefore, since the eddy current in the teeth portion 72 can be suppressed more effectively, the eddy current loss in the teeth portion 72 can be reduced. When this embodiment is applied to a rotary electric machine in which the magnetic flux density of the teeth portion 72 is larger than the magnetic flux density of the back yoke portion 71, a higher effect can be obtained.

In the divided laminated iron core 60 according to the present embodiment, the second portion 92 and the second portion 94 in the back yoke portion 71 and the second portion 92 and the second portion 94 in the teeth portion 72 are stretched in the same direction. There is. According to this configuration, the second portion 92 and the second portion 94 can be easily formed.

In the divided laminated iron core 60 according to the present embodiment, all the second portions 92 of the iron core piece 70A are extended in the same direction, and all the second portions 94 of the iron core piece 70B are extended in the same direction. There is. According to this configuration, the second portion 92 and the second portion 94 can be easily formed.

In the divided laminated iron core 60 according to the present embodiment, the plate thickness t1 of the first portion 91 and the plate thickness t3 of the first portion 93 are 0.35 mm or 0.5 mm. Generally, a thin plate having a plate thickness of 0.35 mm and a thin plate having a plate thickness of 0.5 mm are easily available. Therefore, according to the above configuration, the materials of the iron core piece 70A and the iron core piece 70B can be easily obtained at low cost. The plate thickness t2 of the second portion 92 and the plate thickness t4 of the second portion 94 may be 0.25 mm or less.

The rotary electric machine according to the present embodiment includes a stator 20 having a split laminated iron core 60, and a rotor 30 arranged so as to face the stator 20 through a gap 50. Here, the rotary electric machine is an example of an electric machine. The stator 20 is an example of an armature. The rotor 30 is an example of a field magnet. According to this configuration, the above effect can be obtained in the rotary electric machine.

Embodiment 2.
The laminated iron core of the electric machine according to the second embodiment will be described. FIG. 19 is a perspective view showing the configuration of the iron core piece 70A of the divided laminated iron core 60 according to the present embodiment. The iron core piece 70A of the present embodiment is different from the iron core piece 70A of the first embodiment in each stretching direction of the plurality of second portions 92. The description of the same configuration as that of the first embodiment will be omitted.

As shown in FIG. 19, each of the plurality of second portions 92 in the iron core piece 70A is in the extending direction of the back yoke portion 71, that is, the circumferential direction of the stator core 21 in both the back yoke portion 71 and the teeth portion 72. It extends in a strip shape along the line. Similarly, each of the plurality of first portions 91 of the iron core piece 70A extends in a band shape along the extending direction of the back yoke portion 71 in both the back yoke portion 71 and the teeth portion 72. The parallel direction in which the first portion 91 and the second portion 92 are parallel is the protruding direction of the teeth portion 72, that is, the radial direction of the stator core 21.

Although not shown, the iron core piece 70B laminated with the iron core piece 70A has a first portion 93 formed at a position corresponding to the second portion 92 of the iron core piece 70A and a first portion 91 of the iron core piece 70A. It has a second portion 94 formed at a position corresponding to the above. Also in the iron core piece 70B, each of the plurality of second portions 94 and each of the plurality of first portions 93 are elongated in a strip shape along the extending direction of the back yoke portion 71, that is, the circumferential direction of the stator core 21. ..

In the iron core piece 70A and the iron core piece 70B of the present embodiment, both the convex portion formed in the first portion and the concave portion formed in the second portion have a rectangular cross-sectional shape. However, these convex portions and concave portions may have an arcuate cross-sectional shape as shown in FIG.

As described above, in the divided laminated iron core 60 according to the present embodiment, each of the iron core piece 70A and the iron core piece 70B has a back yoke portion 71 and a teeth portion 72 protruding from the back yoke portion 71. ing. The second portion 92 and the second portion 94 of the back yoke portion 71 are stretched along the stretching direction of the back yoke portion 71.

In the rotary electric machine, the magnetic flux entering the stator core 21 from the rotor 30 flows in the radial direction in the teeth portion 72 and in the circumferential direction in the back yoke portion 71, as shown by the double-headed arrows in FIG. That is, in the present embodiment, the second portion 92 and the second portion 94 of the back yoke portion 71 can be formed long along the direction in which the magnetic flux flows. Therefore, since the eddy current in the back yoke portion 71 can be suppressed more effectively, the eddy current loss in the back yoke portion 71 can be reduced. When this embodiment is applied to a rotary electric machine in which the magnetic flux density of the back yoke portion 71 is larger than the magnetic flux density of the teeth portion 72, a higher effect can be obtained.

Embodiment 3.
The laminated iron core of the electric machine according to the third embodiment will be described. FIG. 20 is a perspective view showing the configuration of the iron core piece 70A of the divided laminated iron core 60 according to the present embodiment. The iron core piece 70A of the present embodiment is different from the iron core piece 70A of the first embodiment in each stretching direction of the plurality of second portions 92. The description of the same configuration as that of the first or second embodiment will be omitted.

As shown in FIG. 20, each of the plurality of second portions 92 in the back yoke portion 71 of the iron core piece 70A is stretched in a strip shape along the stretching direction of the back yoke portion 71, that is, the circumferential direction of the stator core 21. There is. Similarly, each of the plurality of first portions 91 of the back yoke portion 71 of the iron core piece 70A is stretched in a strip shape along the stretching direction of the back yoke portion 71.

On the other hand, each of the plurality of second portions 92 in the teeth portion 72 of the iron core piece 70A is elongated in a strip shape along the stretching direction of the teeth portion 72, that is, the radial direction of the stator core 21. Similarly, each of the plurality of first portions 91 in the teeth portion 72 of the iron core piece 70A is stretched in a band shape along the stretching direction of the teeth portion 72.

Although not shown, the iron core piece 70B laminated with the iron core piece 70A has a first portion 93 formed at a position corresponding to the second portion 92 of the iron core piece 70A and a first portion 91 of the iron core piece 70A. It has a second portion 94 formed at a position corresponding to the above. In the back yoke portion 71 of the iron core piece 70B, each of the plurality of second portions 94 and each of the plurality of first portions 93 are stretched along the stretching direction of the back yoke portion 71. In the teeth portion 72 of the iron core piece 70B, each of the plurality of second portions 94 and each of the plurality of first portions 93 are stretched along the stretching direction of the teeth portion 72.

In the iron core piece 70A and the iron core piece 70B of the present embodiment, both the convex portion formed in the first portion and the concave portion formed in the second portion have a rectangular cross-sectional shape. However, these convex portions and concave portions may have an arcuate cross-sectional shape as shown in FIG.

As described above, in the divided laminated iron core 60 according to the present embodiment, each of the iron core piece 70A and the iron core piece 70B has a back yoke portion 71 and a teeth portion 72 protruding from the back yoke portion 71. ing. The second portion 92 and the second portion 94 of the back yoke portion 71 are stretched along the stretching direction of the back yoke portion 71. The second portion 92 and the second portion 94 of the teeth portion 72 extend along the projecting direction of the teeth portion 72.

In the rotary electric machine, the magnetic flux entering the stator core 21 from the rotor 30 flows in the radial direction in the teeth portion 72 and in the circumferential direction in the back yoke portion 71, as shown by the double-headed arrows in FIG. That is, in the present embodiment, the second portion 92 and the second portion 94 of the back yoke portion 71 can be formed long along the direction in which the magnetic flux flows. Further, in the present embodiment, the second portion 92 and the second portion 94 of the teeth portion 72 can also be formed long along the direction in which the magnetic flux flows. Therefore, the eddy current can be suppressed more effectively as compared with the first and second embodiments. Therefore, the eddy current loss in the stator core 21 can be reduced, and the efficiency of the rotary electric machine can be improved.

Embodiment 4.
The laminated iron core of the electric machine according to the fourth embodiment will be described. FIG. 21 is a perspective view showing the configuration of the iron core piece 70A of the divided laminated iron core 60 according to the present embodiment. The iron core piece 70A of the present embodiment is different from the iron core piece 70A of the first embodiment in each stretching direction of the plurality of second portions 92. The description of the same configuration as any of the first to third embodiments will be omitted.

As shown in FIG. 21, each of the plurality of second portions 92 in the iron core piece 70A has both the extending direction of the back yoke portion 71 and the protruding direction of the teeth portion 72 in both the back yoke portion 71 and the teeth portion 72. It extends in one direction, which is inclined with respect to. The stretching direction of each of the plurality of second portions 92 is inclined at 45 ° with respect to both the stretching direction of the back yoke portion 71 and the protruding direction of the teeth portion 72, for example.

Similarly, each of the plurality of first portions 91 in the iron core piece 70A is inclined with respect to both the extending direction of the back yoke portion 71 and the protruding direction of the teeth portion 72 in both the back yoke portion 71 and the teeth portion 72. It is stretched in one direction. Each stretching direction of the first portion 91 is parallel to each stretching direction of the second portion 92.

Although not shown, the iron core piece 70B laminated with the iron core piece 70A has a first portion 93 formed at a position corresponding to the second portion 92 of the iron core piece 70A and a first portion 91 of the iron core piece 70A. It has a second portion 94 formed at a position corresponding to the above. Each of the plurality of second portions 94 and each of the plurality of first portions 93 in the iron core piece 70B is extended in a direction inclined with respect to both the extending direction of the back yoke portion 71 and the protruding direction of the teeth portion 72. ..

In the rotary electric machine, the magnetic flux entering the stator core 21 from the rotor 30 flows in the radial direction in the teeth portion 72 and in the circumferential direction in the back yoke portion 71. In the configuration of the third embodiment shown in FIG. 20, the second portion 92 of the teeth portion 72 is stretched along the radial direction, and the second portion 92 of the back yoke portion 71 is stretched along the circumferential direction. Therefore, the eddy current can be effectively suppressed. However, in the configuration of the third embodiment, the step of forming the second portion 92 of the teeth portion 72 and the step of forming the second portion 92 of the back yoke portion 71 may be required separately. ..

On the other hand, the second portion 92 of the present embodiment extends in one direction in both the back yoke portion 71 and the teeth portion 72. As a result, the entire second portion 92 of the iron core piece 70A can be formed in one step, so that the productivity of the divided laminated iron core 60 can be increased. Further, since it is not necessary to use separate tool portions for forming the second portion 92 of the teeth portion 72 and forming the second portion 92 of the back yoke portion 71, the manufacturing cost of the tool portion in the crusher 220 is required. Can be suppressed.

The second portion 92 of the present embodiment is stretched in one direction inclined with respect to both the stretching direction of the back yoke portion 71 and the protruding direction of the teeth portion 72. As a result, at least a part of the second portion 92 is formed long along the direction in which the magnetic flux flows, so that the eddy current can be suppressed. According to the present embodiment, especially when the magnetic flux density of the back yoke portion 71 and the magnetic flux density of the teeth portion 72 are substantially the same, it is possible to suppress the eddy current while increasing the productivity of the split laminated iron core 60. it can.

In the iron core piece 70A and the iron core piece 70B of the present embodiment, both the convex portion formed in the first portion and the concave portion formed in the second portion have a rectangular cross-sectional shape. However, these convex portions and concave portions may have an arcuate cross-sectional shape as shown in FIG.

As described above, in the divided laminated iron core 60 according to the present embodiment, each of the iron core piece 70A and the iron core piece 70B has a back yoke portion 71 and a teeth portion 72 protruding from the back yoke portion 71. ing. The second portion 92 and the second portion 94 are stretched in a direction inclined with respect to both the stretching direction of the back yoke portion 71 and the protruding direction of the teeth portion 72. According to this configuration, the eddy current can be suppressed while increasing the productivity of the split laminated iron core 60.

Embodiment 5.
The laminated iron core of the electric machine according to the fifth embodiment will be described. FIG. 22 is a perspective view showing the configuration of the iron core piece 80A of the stator core 21 according to the present embodiment. The description of the same configuration as that of any of the first to fourth embodiments will be omitted.

As shown in FIG. 22, the iron core piece 80A of the present embodiment is a unit core having a plurality of sub iron core pieces 81. The iron core piece 80A has a plurality of sub-core pieces 81 arranged in parallel with each other, and a connecting portion 82 for connecting two sub-core pieces 81 adjacent to each other. The iron core piece 80A shown in FIG. 23 has four sub-core pieces 81 and three connecting portions 82. The number of sub-core pieces 81 included in one iron core piece 80A may be 2, 3, or 5 or more.

Each of the sub-core pieces 81 has a back yoke portion 71 and a teeth portion 72. The connecting portion 82 connects the end portions of the back yoke portions 71 of the two sub-core pieces 81 adjacent to each other in the extending direction. The back yoke portions 71 of the plurality of sub iron core pieces 81 are linearly arranged in parallel via the connecting portion 82. The connecting portion 82 has a structure that can be bent in a plane parallel to the iron core piece 80A. For example, the connecting portion 82 has a plate thickness thinner than that of the first portion 91, similarly to the second portion 92.

Each of the plurality of second portions 92 in the iron core piece 80A is stretched in a band shape along the stretching direction of the back yoke portion 71. Similarly, each of the plurality of first portions 91 in the iron core piece 80A is stretched in a strip shape along the stretching direction of the back yoke portion 71.

Although not shown, another iron core piece laminated with the iron core piece 80A includes a first portion formed at a position corresponding to the second portion 92 of the iron core piece 80A and a first portion 91 of the iron core piece 80A. It has a second portion formed at a position corresponding to the above. In the other iron core piece as described above, each of the plurality of second portions and each of the plurality of first portions are elongated in a strip shape along the stretching direction of the back yoke portion 71.

A laminated unit core is formed by alternately laminating the iron core piece 80A and the other iron core piece described above. The connecting portion 82 is bent in a plane parallel to the iron core piece 80A so that the protruding directions of the teeth portions 72 face the center of the annulus. As a result, each stretching direction of the second portion 92 becomes the circumferential direction of the stator core 21. The bending of the connecting portion 82 may be performed before the plurality of iron core pieces are laminated, or may be performed after the plurality of iron core pieces are laminated. By connecting the plurality of laminated unit cores in an annular shape, the stator core 21 which is a laminated iron core is formed.

In the present embodiment, since a plurality of sub-core pieces 81 are connected, it is possible to reduce the labor of transportation between processes. Further, since a plurality of sub iron core pieces 81 are connected, continuous winding can be easily realized and the connection processing time can be shortened.

The plurality of laminated iron core pieces may be fixed by adhesion, by welding, or by mold fixing using a resin. Alternatively, the plurality of laminated iron core pieces may be fixed by caulking using a half punched portion formed on each iron core piece, or may be fixed by fastening using a fastening member such as a rivet. ..

In the iron core piece 80A of the present embodiment, the second portion 92 is stretched along the stretching direction of the back yoke portion 71, but the present invention is not limited to this. For example, as shown in FIG. 5, the second portion 92 may extend along the protruding direction of the teeth portion 72. Further, as shown in FIG. 20, the second portion 92 of the back yoke portion 71 extends along the stretching direction of the back yoke portion 71, and the second portion 92 of the teeth portion 72 extends along the projecting direction of the teeth portion 72. May be stretched. Further, as shown in FIG. 21, the second portion 92 may be stretched in a direction inclined with respect to both the stretching direction of the back yoke portion 71 and the protruding direction of the teeth portion 72.

In the iron core piece 80A of the present embodiment and the other iron core piece described above, the convex portion formed in the first portion and the concave portion formed in the second portion both have a rectangular cross-sectional shape. There is. However, these convex portions and concave portions may have an arcuate cross-sectional shape as shown in FIG.

As described above, in the stator core 21 according to the present embodiment, each of the plurality of iron core pieces includes a plurality of sub core pieces 81 arranged in parallel and two sub core pieces 81 adjacent to each other. It has a connecting portion 82 for connecting. The connecting portion 82 is bent in a plane parallel to each of the plurality of iron core pieces. According to this configuration, it is possible to reduce the labor of transportation between processes and shorten the wiring processing time, so that the manufacturing cost of the stator core 21 can be reduced.

Embodiment 6.
The laminated iron core of the electric machine according to the sixth embodiment will be described. FIG. 23 is a plan view showing the configuration of the iron core piece 83A of the stator core 21 according to the present embodiment. The stator core 21 according to the present embodiment is different from the stator core 21 of the first embodiment in that it is not divided into a plurality of divided laminated iron cores 60. That is, the stator core 21 according to the present embodiment has a configuration in which a plurality of iron core pieces 83A each having an annular shape are laminated. The description of the same configuration as any of the first to fifth embodiments will be omitted.

As shown in FIG. 23, the iron core piece 83A of the present embodiment has an annular shape. The iron core piece 83A is formed by integrally punching from one steel plate sheet 130. The iron core piece 83A has an annular back yoke portion 71 extending in the circumferential direction, and a plurality of teeth portions 72 protruding inward in the radial direction from the back yoke portion 71.

The iron core piece 83A has a plurality of first portions 91 and a plurality of second portions 92 having a plate thickness thinner than the plate thickness of the first portion 91. In the whole iron core piece 83A, each of the plurality of second portions 92 extends in a strip shape parallel to each other. Similarly, in the entire iron core piece 83A, each of the plurality of first portions 91 extends in a strip shape parallel to each other. Since each of the second portions 92 is stretched in parallel with each other in the entire iron core piece 83A, the steel plate sheet 130 may be crushed in one direction in the crushing step. As a result, it is not necessary to rotate the steel plate sheet 130 or the tool portion 223 and the tool portion 224 of the crusher 220, so that the productivity of the stator core 21 can be increased.

Although not shown, another iron core piece laminated with the iron core piece 83A includes a first portion formed at a position corresponding to the second portion 92 of the iron core piece 83A and a first portion 91 of the iron core piece 83A. It has a second portion formed at a position corresponding to the above. In the other iron core piece as described above, each of the plurality of second portions and each of the plurality of first portions are elongated in a strip shape along the stretching direction of the back yoke portion 71.

By alternately laminating the iron core piece 83A and the other iron core pieces described above, the stator core 21 which is a laminated iron core is formed. In the present embodiment, the step of connecting the plurality of divided laminated iron cores 60 in a ring shape becomes unnecessary, so that the productivity of the stator core 21 can be increased as compared with the first embodiment.

In the iron core piece 83A of the present embodiment and the other iron core piece described above, the convex portion formed in the first portion and the concave portion formed in the second portion both have a rectangular cross-sectional shape. There is. However, these convex portions and concave portions may have an arcuate cross-sectional shape as shown in FIG.

Embodiment 7.
The laminated iron core of the electric machine according to the seventh embodiment will be described. FIG. 24 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core 60 according to the present embodiment is cut in a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92. The description of the same configuration as any of the first to sixth embodiments will be omitted.

In the configuration of the first embodiment shown in FIGS. 7 and 10, each recess has a rectangular cross-sectional shape. For example, both side surfaces of the recess 102 are formed perpendicular to the surface 92a which is the bottom surface of the recess 102.

On the other hand, in the present embodiment, in the cross section shown in FIG. 24, the recess 102 and the recess 104 of the iron core piece 70A are both formed in a tapered shape. Similarly, the recess 106 and the recess 108 of the iron core piece 70B are both formed in a tapered shape.

The configuration of each recess of the present embodiment will be described by taking the recess 102 as an example. The recess 102 has a surface 92a of a second portion 92 that is the bottom surface of the recess 102, and side surfaces 102a and side 102b that face the inside of the recess 102. The side surface 102a connects the surface 92a and the surface 91a of one of the first portions 91 adjacent to the second portion 92. The side surface 102b connects the surface 92a and the surface 91a of the other first portion 91 adjacent to the second portion 92. Each of the side surface 102a and the side surface 102b is a tapered surface inclined with respect to the surface 92a. Further, each of the side surface 102a and the side surface 102b is also inclined with respect to the surface 91a. As a result, the surface 91a and the surface 92a are gently connected by the side surface 102a or the side surface 102b.

The convex portion 101 adjacent to the concave portion 102 has a surface 91a which is an upper surface of the convex portion 101, and a side surface 102a and a side surface 102b facing the outside of the convex portion 101. Here, each of the side surface 102a and the side surface 102b becomes a side surface of the concave portion 102 when paying attention to the concave portion 102, and a side surface of the convex portion 101 when paying attention to the convex portion 101. Each of the side surface 102a and the side surface 102b is a tapered surface inclined with respect to the surface 91a. Further, each of the side surface 102a and the side surface 102b is also inclined with respect to the surface 92a.

According to the present embodiment, when the iron core piece 70A and the iron core piece 70B are laminated, the relative positions of the iron core piece 70A and the iron core piece 70B in the left-right direction of FIG. 24 are autonomously adjusted by the tapered recesses. can do. As a result, when the iron core piece 70A and the iron core piece 70B are laminated, it is possible to prevent the iron core piece 70A and the iron core piece 70B from being displaced from each other. As a result, the alignment when laminating the iron core piece 70A and the iron core piece 70B can be simplified, so that the work of laminating the iron core piece 70A and the iron core piece 70B can be made more efficient, and the productivity of the divided laminated iron core 60 is improved. be able to.

As described above, in the divided laminated iron core 60 according to the present embodiment, each of the recess 102, the recess 104, the recess 106 and the recess 108 is formed in a tapered shape. According to this configuration, when the iron core piece 70A and the iron core piece 70B are laminated, it is possible to suppress the occurrence of misalignment between the iron core piece 70A and the iron core piece 70B.

Embodiment 8.
The laminated iron core of the electric machine according to the eighth embodiment will be described. FIG. 25 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core 60 according to the present embodiment is cut in a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92. The description of the same configuration as any of the first to seventh embodiments will be omitted.

The configuration of each recess of the present embodiment will be described by taking the recess 102 as an example. As shown in FIG. 25, the recess 102 has a surface 92a, a side surface 102a, and a side surface 102b of a second portion 92 which is a bottom surface of the recess 102. Each of the side surface 102a and the side surface 102b is formed perpendicular to the surface 92a, and is also formed perpendicular to the surface 91a of the first portion 91. Further, the recess 102 has a corner portion 102c formed between the surface 92a and the side surface 102a, and a corner portion 102d formed between the surface 92a and the side surface 102b. The corner 102c is rounded so that the surface 92a and the side surface 102a are smoothly connected. Similarly, the corner 102d is rounded so that the surface 92a and the side surface 102b are smoothly connected. Both the corner portion 102c and the corner portion 102d are formed in a cylindrical surface shape.

In the cross section shown in FIG. 25, the width W5 of the first portion 91 of the iron core piece 70A is narrower than the width W8 of the second portion 94 of the iron core piece 70B (W5 <W8). Further, in the same cross section, the width W7 of the first portion 93 of the iron core piece 70B is narrower than the width W6 of the second portion 92 of the iron core piece 70A (W7 <W6). Here, the width W5 of the first portion 91 and the width W7 of the first portion 93 are the widths of the portions that have not been crushed in the crushing process. The width W6 of the second portion 92 and the width W8 of the second portion 94 are the widths of the portions that have been crushed in the crushing step. In the iron core piece 70A of the present embodiment, the width W5 of the first portion 91 is narrower than the width W6 of the second portion 92 (W5 <W6). Further, in the iron core piece 70B of the present embodiment, the width W7 of the first portion 91 is narrower than the width W8 of the second portion 92 (W7 <W8).

A gap 141 and a gap 142 are formed between the concave portion 106 and the convex portion 103 fitted in the concave portion 106. The gap 141 is formed between one side surface of the recess 106 and one side surface of the convex portion 103, and the gap 142 is formed between the other side surface of the concave portion 106 and the other side surface of the convex portion 103. There is. Both the gap 141 and the gap 142 are stretched along the stretching direction of the first portion 91 and the second portion 92. Two similar gaps are formed between the other concave portion and the other convex portion.

Even if the crushing width in the crushing process varies due to the formation of the gap 141 and the gap 142, the iron core piece 70A and the iron core piece 70B interfere with each other when the iron core piece 70A and the iron core piece 70B are laminated. You can prevent it from happening. Therefore, it is possible to prevent the occupancy rate of the iron core in the divided laminated iron core 60 from being lowered due to the interference between the iron core piece 70A and the iron core piece 70B.

As described above, in the divided laminated iron core 60 according to the present embodiment, a gap 141 is formed between one side surface of the concave portion 106 and one side surface of the convex portion 103. A gap 142 is formed between the other side surface of the concave portion 106 and the other side surface of the convex portion 103. According to this configuration, it is possible to prevent the iron core piece 70A and the iron core piece 70B from interfering with each other when the iron core piece 70A and the iron core piece 70B are laminated.

Embodiment 9.
The laminated iron core of the electric machine according to the ninth embodiment will be described. FIG. 26 is a cross-sectional view showing a configuration in which a part of the divided laminated iron core 60 according to the present embodiment is cut in a plane perpendicular to the stretching direction of the first portion 91 and the second portion 92. The description of the same configuration as any of the first to eighth embodiments will be omitted.

As shown in FIG. 26, the iron core piece 70A of the present embodiment has the same configuration as the iron core piece 70A of the eighth embodiment. The recess 104 of the iron core piece 70A has a surface 92b, a side surface 104a, a side surface 104b, a corner portion 104c, and a corner portion 104d. The corner portion 104c is formed between the surface 92b and the side surface 104a. The corner 104d is formed between the surface 92b and the side surface 104b. Both the corner portion 104c and the corner portion 104d are rounded.

The convex portion 105 of the iron core piece 70B fitted into the concave portion 104 of the iron core piece 70A has a surface 93a, a side surface 105a, a side surface 105b, a corner portion 105c, and a corner portion 105d. The corner portion 105c is formed between the surface 93a and the side surface 105a. The corner portion 105c faces the corner portion 104c of the recess 104 and is rounded along the corner portion 104c. The corner portion 105d is formed between the surface 93a and the side surface 105b. The corner portion 105d faces the corner portion 104d of the recess 104 and is rounded along the corner portion 104d.

The concave portion 106 sandwiched between the two convex portions 105 in the iron core piece 70B has a cross-sectional shape different from that of the concave portion 104 of the iron core piece 70A. Therefore, when manufacturing the split laminated iron core 60 of the present embodiment, in the manufacturing process shown in FIG. 12, two crushers 220 having different shapes of the tool portion 223 and the tool portion 224 are arranged in series. To. When forming the thin-walled portion 131 to be the second portion 92 of the iron core piece 70A according to the feed of the steel plate sheet 130, one of the crushers 220 is operated to form the thin-walled portion 131 to be the second portion 94 of the iron core piece 70B. At that time, the other crusher 220 is operated. By operating the two crushers 220 in this way, it is possible to manufacture the split laminated iron core 60 of the present embodiment by a series of continuous steps. Therefore, the productivity of the divided laminated iron core 60 can be increased.

Further, since the corners 104c and 104d of the recess 104 are rounded, the corners of the tool portion 223 and the tool portion 224 can be rounded. Therefore, the stress concentration in each of the tool unit 223 and the tool unit 224 can be relaxed, and the durability of the tool unit 223 and the tool unit 224 can be improved.

As described above, in the divided laminated iron core 60 according to the present embodiment, the recess 104 has a rounded corner portion 104c and a corner portion 104d. The convex portion 105 has a corner portion 105c rounded along the corner portion 104c and a corner portion 105d rounded along the corner portion 104d.

According to this configuration, since the corners of the tool unit 223 and the tool unit 224 can be rounded, the durability of the tool unit 223 and the tool unit 224 can be improved. Further, since the gaps formed between the corner portion 104c and the corner portion 105c and between the corner portion 104d and the corner portion 105d can be reduced, the occupancy rate of the iron core in the divided laminated iron core 60 can be increased. Can be done.

Although the steel plate sheets 130 and the iron core pieces of the above-described embodiments 1 to 9 are formed by using non-oriented electrical steel sheets, they may be formed by using grain-oriented electrical steel sheets, or SPCC, It may be formed by using an iron-based magnetic material such as SS400.

Further, in the above-described embodiments 1 to 9, a rotary electric machine is used as an example of the electric machine, but the present invention is not limited to this. The first to ninth embodiments can be applied to various electric machines in which a laminated iron core is used, for example, a linear motor, a transformer, and the like.

Each of the above embodiments and modifications can be implemented in combination with each other.

10 housing, 20 stator, 21 stator core, 22 stator windings, 30 rotors, 31 rotor cores, 32 permanent magnets, 40 shafts, 41, 42 bearings, 50 voids, 60 split laminated iron cores, 61 back yokes Part laminated body, 62 teeth part laminated body, 62a tip part, 70A, 70B iron core piece, 71 back yoke part, 72 teeth part, 80A iron core piece, 81 sub iron core piece, 82 connecting part, 83A iron core piece, 91 first part , 91a, 91b surface, 92 second part, 92a, 92b surface, 93 first part, 93a, 93b surface, 94 second part, 94a, 94b surface, 101 convex part, 102 concave part, 102a, 102b side surface, 102c, 102d corner, 103 convex, 104 concave, 104a, 104b side, 104c, 104d corner, 105 convex, 105a, 105b side, 105c, 105d corner, 106 concave, 107 convex, 108 concave, 111, 112 , 113, 114 flat surface, 121, 122 repeating pattern, 130 steel plate sheet, 131 thin part, 132 thick part, 141, 142 gap, 170 iron core piece, 171 back yoke part, 172 teeth part, 200 manufacturing equipment, 210 steel plate supply Equipment, 220 crusher, 221 lower table, 222 upper table, 223, 224 tool part, 230 press machine, 231 die, 232 punch, 233 internal space, P1, P2 pitch, P3 deviation width, W1, W2, W3, W4 , W5, W6, W7, W8 width, t1, t2, t3, t4, t5, t6, t11 Plate thickness.

Claims (6)

Equipped with multiple stacked iron core pieces,
The plurality of iron core pieces include a first iron core piece and a second iron core piece adjacent to the first iron core piece in the stacking direction of the plurality of iron core pieces.
Each of the first iron core piece and the second iron core piece has a first portion and a second portion having a plate thickness thinner than the plate thickness of the first portion.
The first portion of the first iron core piece overlaps with the second portion of the second iron core piece when viewed along the stacking direction.
The second portion of the first iron core piece overlaps with the first portion of the second iron core piece when viewed along the stacking direction.
On the first surface of the first iron core piece facing the second iron core piece, a recess is formed in which the surface of the second portion is concave with respect to the surface of the first portion.
On the second surface of the second iron core piece facing the first iron core piece, a convex portion is formed in which the surface of the first portion is convex with respect to the surface of the second portion.
The convex portion is a laminated iron core of an electric machine fitted in the concave portion. The first surface is formed in a wavy shape having a valley portion serving as the recess.
The laminated iron core of the electric machine according to claim 1, wherein the second surface is formed in a wavy shape having a mountain portion to be a convex portion. The laminated iron core of the electric machine according to claim 1, wherein the recess is formed in a tapered shape. The laminated iron core of an electric machine according to any one of claims 1 to 3, wherein a gap is formed between the side surface of the concave portion and the side surface of the convex portion. The recess has rounded corners and is
The laminated iron core of an electric machine according to any one of claims 1 to 3, wherein the convex portion has a rounded corner portion along the corner portion. The armature having the laminated iron core of the electric machine according to any one of claims 1 to 5.
An electric machine including a field magnet arranged so as to face the armature through a gap.

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