Laminated core and motor provided with the same

Abstract

The laminated core includes a laminate configured by laminating a plurality of steel sheets, and a two-dimensional matrix code provided on a side surface of the laminate, the two-dimensional matrix code being inclined with respect to a laminating direction in which the plurality of steel sheets are laminated.

Description

Technical Field

[0001] This disclosure relates to laminated iron cores and electric motors having such laminated iron cores. In particular, this disclosure relates to laminated iron cores having two-dimensional matrix codes and electric motors having such laminated iron cores. Background Technology

[0002] Previously known technologies involve using lasers or similar methods to print ID (identity) marks on components, intermediate assemblies, and final products to enhance traceability. Quality management of components is then implemented by inputting information such as manufacturing conditions and batch numbers into these ID marks. These ID marks are typically printed on a flat surface suitable for printing the entire mark.

[0003] As an example of this prior art, Patent Document 1 discloses a rotor laminated iron core with an identification code. The rotor laminated iron core of Patent Document 1 has a laminated body formed by stacking multiple stamping members, and an identification code is provided on the outer surface of the uppermost or lowermost stamping member forming the laminated body, that is, the main surface of the laminated body.

[0004] However, the main surface of the laminate that constitutes the armature or stator is easily obscured by windings or other components. Therefore, it is considered to place the identification code on the side of the laminate instead of the main surface. However, this side is formed by stacking punched members, so there is a problem: the junction between adjacent punched members becomes noise, resulting in a large number of reading errors.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-176230 Summary of the Invention

[0008] This disclosure was made to solve such a problem, and its purpose is to provide a laminated iron core capable of suppressing the occurrence of reading defects in two-dimensional matrix codes and an electric motor having the laminated iron core.

[0009] To achieve the above objectives, a stacked iron core of the present disclosure includes: a stacked body, which is formed by stacking multiple steel plates; and a two-dimensional matrix code disposed on the side of the stacked body, wherein the two-dimensional matrix code is inclined relative to the stacking direction of the multiple steel plates.

[0010] In addition, another technical solution of this disclosure has an electric motor with the laminated iron core of the above-mentioned technical solution.

[0011] According to this disclosure, a stacked iron core capable of suppressing the occurrence of reading defects in two-dimensional matrix codes and an electric motor having the stacked iron core can be provided. Attached Figure Description

[0012] Figure 1 This is an exploded perspective view of the electric motor in the embodiment.

[0013] Figure 2 It means Figure 1 A flowchart illustrating an example of the production process of an electric motor.

[0014] Figure 3A This is a diagram representing the two-dimensional matrix code of the comparison example.

[0015] Figure 3B It means Figure 1 The diagram shows the two-dimensional matrix code of the electric motor.

[0016] Figure 4A This is a diagram representing a two-dimensional matrix code when the tilt angle relative to the stacking direction is 0 degrees.

[0017] Figure 4B This is a diagram representing a two-dimensional matrix code with a tilt angle of 5 degrees relative to the stacking direction.

[0018] Figure 4C This is a diagram representing a two-dimensional matrix code with a tilt angle of 10 degrees relative to the stacking direction.

[0019] Figure 4D This is a diagram representing a two-dimensional matrix code with a tilt angle of 15 degrees relative to the stacking direction.

[0020] Figure 4E This is a diagram representing a two-dimensional matrix code with a tilt angle of 30 degrees relative to the stacking direction.

[0021] Figure 4F This is a diagram representing a two-dimensional matrix code with a tilt angle of 45 degrees relative to the stacking direction.

[0022] Figure 5 It means Figures 4A to 4F Readability charts at various tilt angles. Detailed Implementation

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Furthermore, the embodiments described below represent specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, and connection methods shown in the following embodiments are examples and are not intended to limit the present disclosure. Consequently, any constituent elements in the following embodiments that are not described in the independent claims representing the highest-level concept of the present disclosure will be described as arbitrary constituent elements.

[0024] In addition, the figures are schematic diagrams and may not be strictly accurate. In each figure, substantially identical structures are labeled with the same reference numerals, and repetitive descriptions are omitted or simplified.

[0025] Furthermore, in this specification and accompanying drawings, the X-axis, Y-axis, and Z-axis represent the three axes of a three-dimensional orthogonal coordinate system. For convenience, the Z-axis direction is aligned with the stacking direction of the multiple steel plates. The X-axis and Y-axis are mutually orthogonal and both orthogonal to the Z-axis.

[0026] (Implementation Method)

[0027] First, use Figure 1 The structure of the electric motor 10 in the embodiment is explained. Figure 1 This is an exploded perspective view of the electric motor 10 according to the embodiment.

[0028] like Figure 1 As shown, the electric motor 10 includes a frame 12, a stator 14, a rotor 16, a commutator 18, brushes 20, brush holders 22, a sealing ring 24, bearings 13 and 26. The electric motor 10 is an internal rotor motor in which the rotor 16 is disposed inside the stator 14. The electric motor 10 has permanent magnets 28 in the stator 14 and windings 32 in the rotor 16. That is, in the electric motor 10, the rotor 16 is the armature. The electric motor 10 has a two-dimensional matrix code 38 on the side of the laminated iron core 30 of the rotor 16, as detailed below. Furthermore, in the following description, axial direction refers to the axial direction of the rotation shaft 34, radial direction refers to the radial direction of the rotation shaft 34, and circumferential direction refers to the circumferential direction of the rotation shaft 34. In this embodiment, the axial direction coincides with the stacking direction (Z-axis direction) of the plurality of steel plates 40.

[0029] Frame 12 is a housing that houses the stator 14 and rotor 16, etc. Frame 12 is the outer outer component of the electric motor 10. Frame 12 is a bottomed cylindrical body. Frame 12 opens to one axial direction. Frame 12 supports bearing 13 at its bottom. For example, frame 12 is made of iron with high magnetic permeability.

[0030] The stator 14 generates a magnetic force that acts on the rotor 16. The stator 14 has a plurality of permanent magnets 28. The plurality of permanent magnets 28 are arranged in a circumferentially spaced manner. The plurality of permanent magnets 28 are fixed to the inner surface of the frame 12. The plurality of permanent magnets 28 extend circumferentially.

[0031] The rotor 16 rotates relative to the stator 14. As described above, the rotor 16 is disposed inside the stator 14, and a small air gap is formed between the rotor 16 and the stator 14 in the radial direction. The rotor 16 has a laminated iron core 30, a plurality of windings 32, and a rotating shaft 34.

[0032] The laminated core 30 is a laminated core for an electric motor that forms part of the electric motor 10. The laminated core 30 is a rotor core, which is an armature core with multiple windings 32 wound around it. The laminated core 30 has a laminate body 36 and a two-dimensional matrix code 38.

[0033] The laminate 36 consists of multiple steel plates 40 (see reference). Figure 3B The laminate 36 is a stacked body formed by stacking multiple steel plates 40 in the axial direction. Each of the multiple steel plates 40 is an electromagnetic steel plate. For example, the thickness of each of the multiple steel plates 40 is approximately 0.5 mm. The laminate 36 has multiple teeth 42. Each of the multiple teeth 42 protrudes radially outward. The multiple teeth 42 are arranged at equal intervals in the circumferential direction. That is, the multiple teeth 42 extend radially in a direction orthogonal to the axis A of the rotation shaft 34.

[0034] Multiple windings 32 are armature windings wound around a laminated iron core 30. The multiple windings 32 are wound around multiple teeth 42 of the laminated iron core 30. The multiple windings 32 are wound to generate a magnetic force acting on the stator 14 when current flows through them. When current is supplied to the multiple windings 32, the rotor 16 rotates relative to the stator 14. For example, the wires constituting the multiple windings 32 are insulated wires, having a conductive wire made of a conductive material such as copper as the core wire and an insulating film covering the conductive wire.

[0035] The rotating shaft 34 is fixed to the laminated iron core 30 in a manner that extends axially through it. For example, the rotating shaft 34 is made of a metal rod or the like. The rotating shaft 34 is fixed to the laminated iron core 30 by pressing or heat-fitting it into a central hole formed in the laminated iron core 30. A bearing 26 is provided at one end of the rotating shaft 34 to support it so that it can rotate. The other end of the rotating shaft 34 is rotatably supported by a bearing 13 provided on the frame 12.

[0036] A two-dimensional matrix code 38 is disposed on the side of the laminate 36. The two-dimensional matrix code 38 is disposed on the outer side of the laminate 36, that is, the outer side of the tooth 42. The side of the laminate 36 is formed by arranging the sides of multiple steel plates 40 along the lamination direction. The two-dimensional matrix code 38 is inclined relative to the lamination direction of the multiple steel plates 40, as detailed below.

[0037] The commutator 18 is mounted on the rotating shaft 34. The commutator 18 rotates together with the rotating shaft 34. The commutator 18 has a plurality of commutator segments 44. The plurality of commutator segments 44 are electrically connected to the plurality of windings 32.

[0038] The brush 20 is a power supply brush for supplying electric power to the plurality of windings 32. The brush 20 is in contact with the plurality of commutator segments 44, and the armature current supplied to the brush 20 via the power supply terminal flows to the plurality of windings 32 via the commutator segments 44. For example, the brush 20 is a conductive carbon brush made of carbon, which is an elongated substantially rectangular parallelepiped.

[0039] The brush holder 22 holds the brush 20. The brush holder 22 is fixed to the frame 12 so as to close the opening of the frame 12.

[0040] The seal ring 24 is an annular member disposed so as to fill the gap between the brush holder 22 and the frame 12.

[0041] In the electric motor 10 configured as described above, the current supplied to the brush 20 flows as an armature current (driving current) via the commutator 18 to the plurality of windings 32 wound around the rotor 16. As a result, magnetic flux is generated in the rotor 16. The magnetic force generated by the interaction between the magnetic flux generated in the rotor 16 and the magnetic flux generated from the stator 14 serves as torque for rotating the rotor 16. At this time, the direction in which the current flows is switched according to the positional relationship when the commutator segments 44 included in the commutator 18 are in contact with the brush 20. By switching the direction of the current flow in this manner, a rotational force in a certain direction is generated by the repulsive force and attractive force of the magnetic force generated between the stator 14 and the rotor 16, and the rotor 16 rotates around the rotating shaft 34.

[0042] Next, using Figure 2 the production process of the electric motor 10 of the present embodiment will be described. Figure 2 is a diagram showing Figure 1 a flowchart of an example of the production process of the electric motor 10.

[0043] Here, the production process of the electric motor 10 includes an armature process for producing an armature, and an assembly and inspection process for assembling the produced armature with other components and performing inspection. In Figure 2 , steps S1 to S10 are the armature process, and steps S11 to S15 are the assembly and inspection process.

[0044] As shown in Figure 2 , first, pressing is performed to form the laminated core 30 (step S1). Specifically, pressure is applied after laminating a plurality of steel plates 40 to form a laminated body 36. After the laminated body 36 is formed, a two-dimensional matrix code 38 is printed on the side surface of the laminated body 36 using a laser or the like (step S2).

[0045] Next, a rotating shaft 34 is pressed into the formed stacked iron core 30 (step S3), and a commutator 18 is pressed into the rotating shaft 34 pressed into the stacked iron core 30 (step S4).

[0046] After the commutator 18 is pressed into the rotating shaft 34, the winding 32 is wound on the stacked iron core 30 (step S5), and welding is performed to electrically connect the multiple windings 32 and the multiple commutator segments 44 respectively (step S6).

[0047] After welding, the outer periphery of the commutator 18 is cut (step S7) to remove the chips generated by cutting (step S8).

[0048] After removing the chips, the balance of the armature is measured (step S9). In the finished state of the armature, electrical checks are performed, such as resistance checks between commutator segments 44 and insulation resistance checks between winding 32 and laminated core 30 (armature finished product checks) (step S10).

[0049] The armature, which has completed the electrical inspection, is supplied with brush holders 22 and bearings 26, etc., which have temporarily held the brush 20 in place (step S11). These components are then pressed into the equilateral armature assembly to release the brush 20 (step S12).

[0050] Next, the frame 12 is assembled by fixing multiple permanent magnets 28 on the inner surface of the frame 12 (step S13), and magnetization is performed after pressing an armature or the like into the assembled frame 12 (step S14).

[0051] Finally, perform a characteristic check and a bearing height check from the open side flange end face of frame 12 to the upper end face of bearing 26 (step S15) to end the process.

[0052] As described above, produce 10 electric motors.

[0053] Next, the two-dimensional matrix code 38 of this embodiment will be explained using FIG3. Figure 3A This is a diagram representing the two-dimensional matrix code 100 of the comparison example. Figure 3B express Figure 1 The electric motor 10 is equipped with a two-dimensional matrix code 38.

[0054] like Figure 3A and Figure 3BAs shown, two-dimensional matrix codes 38 and 100 are DMCs (Data Matrix Codes). A DMC is constructed by arranging multiple unit cells of a substantial square shape along the row and column directions. Each unit cell is either a white cell or a black cell. The arrangement of white and black cells is associated with predetermined information. By reading the arrangement of white and black cells, the predetermined information associated with that arrangement can be obtained. Two-dimensional matrix codes 38 and 100 respectively include a quiet zone, a clock pattern, and an alignment pattern. The higher the reading accuracy of the quiet zone, clock pattern, and alignment pattern, the higher the readability of the two-dimensional matrix code.

[0055] In this embodiment, if either the row direction or column direction of the two-dimensional matrix code is not tilted relative to the stacking direction of the multiple steel plates (i.e., it is parallel to the stacking direction), the two-dimensional matrix code is considered not tilted relative to the stacking direction. If both the row direction and column direction of the two-dimensional matrix code are tilted relative to the stacking direction of the multiple steel plates (i.e., they are not parallel to the stacking direction), the two-dimensional matrix code is considered tilted relative to the stacking direction. The tilt angle of the two-dimensional matrix code relative to the stacking direction of the multiple steel plates is the angle between the stacking direction and the column direction of the two-dimensional matrix code.

[0056] like Figure 3A As shown, the comparative example's two-dimensional matrix code 100 is constructed by arranging white units 102 and black units 104 in a matrix configuration. The two-dimensional matrix code 100 is arranged in a stacking direction not relative to the multiple steel plates 106 (see reference). Figure 3A The Z-axis is tilted on the side of the laminate 108. Here, the size of one white unit 102 and one black unit 104 is smaller than the thickness of the steel plate 106. For example, in the case where the black unit 104 constituting the clock pattern of the two-dimensional matrix code 100 is formed to be connected to the boundary 110 located between adjacent steel plates 106 (refer to the case of the clock pattern of the two-dimensional matrix code 100), the black unit 104 is formed to be connected to the boundary 110 located between adjacent steel plates 106. Figure 3A (The portion enclosed by the dashed line indicated by arrow B) presents the following possibilities: the width of the black cell 104 cannot be read accurately; the grid fluctuates during cell division; and the clock pattern cannot be read accurately. Furthermore, for example, when the boundary 110 of adjacent steel plates 106 is located at the boundary between the quiet zone and the clock pattern (refer to the section enclosed by arrow B), the following possibilities exist: Figure 3A The area enclosed by the dashed line indicated by arrow C may not be able to be read accurately in the quiet zone and clock pattern, resulting in poor reading of the 2D matrix code 100.

[0057] In contrast, such as Figure 3BAs shown, the two-dimensional matrix code 38 of this embodiment is constructed by arranging white units 46 and black units 48 in a matrix. The two-dimensional matrix code 38 is arranged in the stacking direction relative to the stacking of the plurality of steel plates 40 (refer to...). Figure 3B The Z-axis of the two-dimensional matrix code 38 is tilted on the side of the stacked body 36. When viewed radially, the two-dimensional matrix code 38 is tilted relative to the stacking direction of the multiple steel plates 40. The tilt angle of the two-dimensional matrix code 38 relative to the stacking direction of the multiple steel plates 40 is preferably 30 degrees or more and 60 degrees or less. Specifically, as an example, the tilt angle of the two-dimensional matrix code 38 relative to the stacking direction of the multiple steel plates 40 is 45 degrees. By tilting the two-dimensional matrix code 38 relative to the stacking direction of the multiple steel plates 40, each side of the white unit 46 and each side of the black unit 48 are tilted relative to the stacking direction of the multiple steel plates 40. Here, the size of one white unit 46 and the size of one black unit 48 are smaller than the thickness of the steel plate 40. By tilting the two-dimensional matrix code 38 relative to the stacking direction of the multiple steel plates 40, the black unit 48 is tilted relative to the stacking direction of the multiple steel plates 40, thus preventing the black unit 48 from being connected to the boundary 50 and thus preventing the accurate reading of the width of the black unit 48. Furthermore, the boundary between the quiet zone and the clock pattern is tilted relative to the stacking direction of the multiple steel plates 40. Therefore, it is possible to prevent the boundary 50 from being located along the boundary between the quiet zone and the clock pattern, and to suppress the inaccurate reading of the quiet zone and the clock pattern. Thus, it is possible to suppress the occurrence of poor reading of the two-dimensional matrix code 38.

[0058] As described above, by tilting the two-dimensional matrix code 38 relative to the stacking direction of the multiple steel plates 40, the decrease in readability of the two-dimensional matrix code 38 can be suppressed, and the occurrence of reading defects can be suppressed.

[0059] Next, the experimental results of the readability of the two-dimensional matrix code at various tilt angles will be explained. Here, the experiment was conducted with the thickness of the steel plate set to 0.5 mm and the length of one side of one unit constituting the two-dimensional matrix code set to 0.3 mm.

[0060] Figures 4A to 4F It is a diagram representing two-dimensional matrix codes with different tilt angles. Figure 4A This is a diagram representing a two-dimensional matrix code when the tilt angle relative to the stacking direction is 0 degrees. Figure 4B This is a diagram representing a two-dimensional matrix code with a tilt angle of 5 degrees relative to the stacking direction. Figure 4C This is a diagram representing a two-dimensional matrix code with a tilt angle of 10 degrees relative to the stacking direction. Figure 4D This is a diagram representing a two-dimensional matrix code with a tilt angle of 15 degrees relative to the stacking direction. Figure 4E This is a diagram representing a two-dimensional matrix code with a tilt angle of 30 degrees relative to the stacking direction. Figure 4F This is a diagram representing a two-dimensional matrix code with a tilt angle of 45 degrees relative to the stacking direction. Additionally, in Figures 4A to 4F In the diagram, a unit cell surrounded by a quadrilateral represents a unit cell that has experienced a read error.

[0061] Figure 5 It means Figures 4A to 4F Readability charts at various tilt angles.

[0062] exist Figure 5 In the diagram shown, modulation index is an indicator of the readability of each unit cell that makes up the two-dimensional matrix code. Modulation index indicates the ease with which each unit cell is distinguished as either a white or black cell. For example, modulation index indicates how much margin there is between the value obtained for a particular unit cell used to distinguish whether it is a white or black cell and the threshold used to distinguish it. The larger this margin, the easier it is to distinguish whether it is a white or black cell, and the higher the modulation index level.

[0063] In addition, Figure 5 In the diagram shown, fixed pattern damage is an indicator of the readability of the quiet zone, clock pattern, and alignment pattern that constitute the two-dimensional matrix code. Fixed pattern damage indicates the ease of distinguishing the quiet zone, clock pattern, and alignment pattern. For example, for each unit cell constituting the two-dimensional matrix code, the value used to distinguish whether it is a white or black cell is read. Based on the arrangement of these values, the arrangement of white and black cells is known, and the quiet zone, clock pattern, and alignment pattern can be distinguished. The larger the margin of these values ​​relative to the threshold used to distinguish whether it is a white or black cell, the easier it is to distinguish the quiet zone, clock pattern, and alignment pattern, and the higher the level of fixed pattern damage.

[0064] For example, such as Figure 4A As shown, when the tilt angle of the 2D matrix code relative to the stacking direction is 0 degrees, the modulation level and the fixed pattern damage level are both 0. When the tilt angle of the 2D matrix code relative to the stacking direction is 5 degrees, 10 degrees, and 15 degrees, the modulation level is 0, and the fixed pattern damage level is 2. When the tilt angle of the 2D matrix code relative to the stacking direction is 30 degrees, the modulation level is 1, and the fixed pattern damage level is 2. When the tilt angle of the 2D matrix code relative to the stacking direction is 45 degrees, the modulation level is 2, and the fixed pattern damage level is 3.

[0065] It can be seen that by setting the tilt angle of the two-dimensional matrix code relative to the stacking direction to 5 degrees, the level of pattern damage is increased, and the readability of the quiet zone, clock pattern, and alignment pattern is improved. On the other hand, it can be seen that if the modulation level remains unchanged, the readability of each unit constituting the two-dimensional matrix code remains unchanged.

[0066] Setting the tilt angle of the two-dimensional matrix code relative to the stacking direction to 10 degrees or 15 degrees is essentially the same as setting it to 5 degrees.

[0067] By setting the tilt angle of the two-dimensional matrix code relative to the stacking direction to 30 degrees, the levels of both modulation and fixed pattern damage are increased. It can be seen that the readability of each unit constituting the two-dimensional matrix code, as well as the readability of the quiet zone, clock pattern, and alignment pattern, are all improved.

[0068] By setting the tilt angle of the two-dimensional matrix code relative to the stacking direction to 45 degrees, the levels of both modulation and fixed pattern damage are further increased. It can be seen that the readability of each unit constituting the two-dimensional matrix code, as well as the readability of the quiet zone, clock pattern, and alignment pattern, are further improved.

[0069] Although the illustration is omitted, it is believed that the tilt angle of the two-dimensional matrix code relative to the stacking direction has an axisymmetric detection characteristic centered at 45 degrees. Therefore, it is believed that setting the tilt angle of the two-dimensional matrix code relative to the stacking direction to 60 degrees exhibits the same tendency as setting it to 30 degrees.

[0070] When the tilt angle of the two-dimensional matrix code relative to the stacking direction is greater than 30 degrees and less than 60 degrees, as described above, the readability of the two-dimensional matrix code is higher than that when the tilt angle is greater than 0 degrees and less than 30 degrees, and it can suppress the occurrence of reading defects. When the tilt angle of the two-dimensional matrix code relative to the stacking direction is 45 degrees, the readability of the two-dimensional matrix code is the highest, and it can further suppress the occurrence of reading defects.

[0071] The above describes the stacked iron core 30 of the embodiment and the electric motor 10 equipped with the stacked iron core 30.

[0072] According to the embodiment, the stacked iron core 30 includes a stacked body 36 formed by stacking multiple steel plates 40 and a two-dimensional matrix code 38 disposed on the side of the stacked body 36. The two-dimensional matrix code 38 is inclined relative to the stacking direction of the multiple steel plates 40.

[0073] Therefore, the two-dimensional matrix code 38 is disposed on the side of the laminate 36. This prevents the two-dimensional matrix code 38 from being obscured by other components, thus suppressing a decrease in readability. Furthermore, the two-dimensional matrix code 38 is tilted relative to the stacking direction of the plurality of steel plates 40. This prevents the boundary 50 between adjacent steel plates 40 from being parallel to the row and column directions of the two-dimensional matrix code 38. This suppresses a decrease in readability caused by at least one of the white units 46 and black units 48 constituting the two-dimensional matrix code 38 being connected to the boundary 50, thus suppressing the occurrence of poor readability of the two-dimensional matrix code 38.

[0074] Furthermore, in the stacked iron core 30 of the embodiment, the tilt angle of the two-dimensional matrix code 38 relative to the stacking direction is more than 30 degrees and less than 60 degrees.

[0075] Therefore, it is possible to further suppress the decline in readability of each unit cell constituting the two-dimensional matrix code 38, namely the white unit 46 and the black unit 48, and to further suppress the occurrence of poor readability of the two-dimensional matrix code 38.

[0076] Furthermore, in the stacked core 30 of the embodiment, the tilt angle of the two-dimensional matrix code 38 relative to the stacking direction is 45 degrees.

[0077] Therefore, compared with the case where the tilt angle is 30 degrees, it is possible to further suppress the decline in readability of each unit cell constituting the two-dimensional matrix code 38, namely the white unit 46 and the black unit 48, and to further suppress the occurrence of reading defects in the two-dimensional matrix code 38.

[0078] Furthermore, in the stacked iron core 30 of the embodiment, the two-dimensional matrix code 38 is a DMC.

[0079] Therefore, by tilting the two-dimensional matrix code 38 relative to the stacking direction, it is possible to suppress the decrease in readability of the quiet zone, clock pattern, and alignment pattern. Consequently, it is possible to suppress the occurrence of poor DMC readings.

[0080] Furthermore, the electric motor 10 of the embodiment includes the aforementioned laminated iron core 30.

[0081] Thus, an electric motor 10 can be obtained that can suppress the occurrence of reading errors in the two-dimensional matrix code 38.

[0082] Furthermore, the electric motor 10 of the embodiment also includes a winding 32 wound on the laminated iron core 30.

[0083] Therefore, even when the laminated iron core 30 is wound with winding 32, the two-dimensional matrix code 38 can be prevented from being obscured by the winding 32. Thus, the decrease in readability of the two-dimensional matrix code 38 can be suppressed.

[0084] (Other implementation methods, etc.)

[0085] The above description, based on embodiments, illustrates the laminated iron core 30 and the electric motor 10 equipped with the laminated iron core 30 of this disclosure. However, this disclosure is not limited to the above embodiments.

[0086] In the above embodiments, the case where the laminated core 30 is a rotor core with windings 32 has been described. However, it is not limited to this. For example, the laminated core may also be a rotor core without windings, a stator core with windings, or a stator core without windings. That is to say, the laminated core may or may not be an armature core.

[0087] In the above embodiments, the case where the stator 14 does not have a laminated core has been described. However, it is not limited to this. For example, the stator may also have a laminated core. In this case, a two-dimensional matrix code may also be provided on the side of the laminated core.

[0088] In the above embodiment, the case where the motor 10 is an inner rotor motor in which the rotor 16 is disposed inside the stator 14 has been described. However, it is not limited to this. For example, the motor may also be an outer rotor motor in which the rotor is disposed outside the stator. In this case, a two-dimensional matrix code may be provided on the side of the laminated iron core of the stator or on the side of the laminated iron core of the rotor.

[0089] In the above embodiment, the case where the two-dimensional matrix code 38 is provided on the outer surface of the laminate 36 has been described. However, it is not limited to this. For example, the two-dimensional matrix code may also be provided on the inner surface of the laminate.

[0090] In the above embodiments, the case where the two-dimensional matrix code 38 is a DMC has been described. However, it is not limited to this. For example, the two-dimensional matrix code can also be a QR code (registered trademark) or Veri Code, or it can be various two-dimensional matrix codes composed of white and black units arranged along the row and column directions.

[0091] In the above embodiment, the case where the size of the white unit 46 and the size of the black unit 48 constituting the two-dimensional matrix code 38 are smaller than the thickness of the steel plate 40 has been described. However, this is not a limitation. For example, the size of the white unit and the size of the black unit constituting the two-dimensional matrix code may be equal to or larger than the thickness of the steel plate.

[0092] In the above embodiment, the case where one two-dimensional matrix code 38 is provided in the laminate 36 has been described. However, it is not limited to this. For example, multiple two-dimensional matrix codes may be provided in the laminate. In this case, for example, the tilt angle relative to the stacking direction of the multiple steel plates may be changed for each two-dimensional matrix code. In addition, the code size may be changed for each two-dimensional matrix code.

[0093] In the above embodiments, the case of printing the two-dimensional matrix code 38 using a laser or the like has been described. However, it is not limited to this. For example, the two-dimensional matrix code can also be printed using an inkjet or the like.

[0094] Furthermore, this disclosure also includes forms obtained by applying various modifications to the above embodiments that would be conceived by those skilled in the art, or forms achieved by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of this disclosure.

[0095] Industrial availability

[0096] The technology disclosed herein can be widely used in the laminated iron core of the stator and the laminated iron core of the rotor of electric motors. Furthermore, the technology disclosed herein can be widely used not only in stators and rotors, but also in electric motors having stators and rotors, and various electrical devices having such motors. Alternatively, it can be used in the core of transformers constructed from laminated steel plates.

[0097] Explanation of reference numerals in the attached figures

[0098] 10. Electric motor; 12. Frame; 13, 26. Bearings; 14. Stator; 16. Rotor; 18. Commutator; 20. Brush; 22. Brush holder; 24. Sealing ring; 28. Permanent magnet; 30. Laminated iron core; 32. Winding; 34. Rotating shaft; 36. Laminated body; 38. Two-dimensional matrix code; 40. Steel plate; 42. Gear; 44. Commutator segment; 46. White unit; 48. Black unit; 50. Junction.

Claims

1. A laminated iron core, wherein, The laminated iron core includes: A laminated body, which is constructed by stacking multiple steel plates; and A two-dimensional matrix code is located on the side of the stacked body. The two-dimensional matrix code is tilted relative to the stacking direction of the plurality of steel plates.

2. The laminated iron core according to claim 1, wherein, The tilt angle of the two-dimensional matrix code relative to the stacking direction is greater than 30 degrees and less than 60 degrees.

3. The laminated iron core according to claim 2, wherein, The tilt angle is 45 degrees.

4. The laminated iron core according to any one of claims 1 to 3, wherein, The two-dimensional matrix code is a data matrix code.

5. An electric motor, wherein, The electric motor has a laminated iron core as described in any one of claims 1 to 4.

6. The electric motor according to claim 5, wherein, The motor also has windings wound around the laminated iron core.

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