WO2024075621A1 - Noyau de fer empilé et procédé de fabrication de noyau de fer empilé - Google Patents

Noyau de fer empilé et procédé de fabrication de noyau de fer empilé Download PDF

Info

Publication number
WO2024075621A1
WO2024075621A1 PCT/JP2023/035358 JP2023035358W WO2024075621A1 WO 2024075621 A1 WO2024075621 A1 WO 2024075621A1 JP 2023035358 W JP2023035358 W JP 2023035358W WO 2024075621 A1 WO2024075621 A1 WO 2024075621A1
Authority
WO
WIPO (PCT)
Prior art keywords
block
end faces
steel plate
steel
surface roughness
Prior art date
Application number
PCT/JP2023/035358
Other languages
English (en)
Japanese (ja)
Inventor
崇人 水村
尚 茂木
克 高橋
Original Assignee
日本製鉄株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Publication of WO2024075621A1 publication Critical patent/WO2024075621A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/33—Arrangements for noise damping

Definitions

  • the present invention relates to a stacked core and a method for manufacturing a stacked core.
  • Patent Document 1 discloses partially interposing vibration-damping steel sheets between a plurality of laminated electromagnetic steel sheets.
  • Patent Literature 2 discloses that after forming grooves on the sheet surface of each electromagnetic steel sheet, multiple electromagnetic steel sheets are stacked so that the sheet surfaces not formed with the grooves do not overlap each other.
  • Patent Literature 2 also discloses that an adhesive resin is applied to the end surfaces of the multiple stacked electromagnetic steel sheets.
  • Patent Document 3 discloses providing a stress member that is compressively deformed along the longitudinal direction of a plane that constitutes the outer periphery of an iron core.
  • Patent Document 4 discloses stacking a plurality of electrical steel sheets, each having an insulating coating containing 4.9 to 7.1% Si and having a surface roughness Rmax of 3.5 ⁇ m or more, and also discloses inserting an impregnating agent, which also functions as an adhesive, between the stacked electrical steel sheets.
  • Patent Documents 1 to 4 require a material other than the steel sheet to suppress vibration of the stacked core.
  • the present invention has been made in consideration of the above problems, and has an object to provide a stacked core that can suppress vibration without using a material other than steel sheets.
  • the stacked core of the present invention comprises a plurality of blocks, each having a plurality of stacked steel plates, the plurality of blocks having block opposing end faces, the block opposing end faces being end faces among the end faces of the blocks that are positioned opposite each other of the blocks, and each of at least one pair of the block opposing end faces satisfies the following formula (A), and the pair of block opposing end faces are two of the block opposing end faces that are arranged in positions opposite each other. 1 ⁇ Ra(D)/Ra(S) ⁇ 12 ...
  • Ra(D) is the surface roughness Ra ( ⁇ m) of the block-facing end face in the stacking direction of the steel plate
  • Ra(S) is the surface roughness Ra ( ⁇ m) of the plate surface of the steel plate having an end face that constitutes part of the block-facing end face, in the direction of the main magnetic flux flowing through the steel plate or the rolling direction of the steel plate.
  • the method for manufacturing a stacked core of the present invention is a method for manufacturing a stacked core having a plurality of blocks each having a plurality of stacked steel plates, and includes a cutting process for cutting the steel plate, a first roughness measurement process for measuring the surface roughness Ra(S) ( ⁇ m) of the plate surface of the steel plate cut in the cutting process, a second roughness measurement process for measuring the surface roughness Ra(D) ( ⁇ m) of the block-facing end surface of the block having the steel plate to be measured for the surface roughness Ra(S), and a roughness adjustment process for adjusting the surface roughness of the block-facing end surface when the ratio Ra(D)/Ra(S) of the surface roughness Ra(D) measured in the second roughness measurement process to the Ra(S) measured in the first roughness measurement process does not satisfy 1 ⁇ Ra(D)/Ra(S) ⁇ 12,
  • the roughness Ra(S) is the surface roughness Ra( ⁇ m) in the direction of the main magnetic flux flowing through the steel plate when
  • FIG. 1 is a diagram showing an example of a stacked core.
  • FIG. 2A is a diagram illustrating a first example of measurement positions for the surface roughness in the lamination direction.
  • FIG. 2B is a diagram illustrating a second example of the measurement positions for the surface roughness in the lamination direction.
  • FIG. 2C is a diagram illustrating a third example of the measurement positions of the surface roughness in the lamination direction.
  • FIG. 2D is a diagram illustrating a fourth example of the measurement positions of the surface roughness in the lamination direction.
  • FIG. 2E is a diagram illustrating a fifth example of the measurement positions of the surface roughness in the stacking direction.
  • FIG. 3A is a diagram illustrating a first example of measurement positions for in-plane surface roughness.
  • FIG. 3A is a diagram illustrating a first example of measurement positions for in-plane surface roughness.
  • FIG. 3A is a diagram illustrating a first example of measurement positions for in-plane surface roughness
  • FIG. 3B is a diagram illustrating a second example of the measurement positions for the in-plane surface roughness.
  • FIG. 3C is a diagram illustrating a third example of the measurement positions of the in-plane surface roughness.
  • FIG. 3D is a diagram illustrating a fourth example of the measurement positions for the in-plane surface roughness.
  • FIG. 3E is a diagram illustrating a fifth example of the measurement positions for the in-plane surface roughness.
  • FIG. 4A is a diagram illustrating a first example of the number of crystal grains on the opposing end surface of a steel sheet and the length of the opposing end surface of a steel sheet.
  • FIG. 4B is a diagram illustrating a second example of the number of crystal grains on the opposing end surface of the steel sheet and the length of the opposing end surface of the steel sheet.
  • FIG. 4C is a diagram illustrating a third example of the number of crystal grains on the opposing end surface of the steel sheet and the length of the opposing end surface of the steel sheet.
  • FIG. 4D is a diagram illustrating a fourth example of the number of crystal grains on the opposing end surface of the steel sheet and the length of the opposing end surface of the steel sheet.
  • FIG. 4E is a diagram illustrating a fifth example of the number of crystal grains on the opposing end surface of the steel sheet and the length of the opposing end surface of the steel sheet. 4 is a flowchart showing an example of a method for manufacturing a stacked core.
  • compared objects including length, position, size, spacing, etc., being the same includes not only objects that are strictly the same, but also objects that are different within the scope of the invention (for example, objects that differ within the tolerance range determined at the time of design).
  • FIG. 1 is a diagram showing an example of a stacked core 100. Note that the x-y-z coordinates shown in FIG. 1 are shown for convenience in explaining the orientation of each part.
  • the stacked core 100 shown in FIG. 1 is, for example, a stacked core (a so-called three-phase stacked core) around which a coil through which a three-phase AC current flows is wound. Note that the current flowing through the coil wound around the stacked core 100 is not limited to three-phase AC. For example, the current flowing through the coil wound around the stacked core 100 may be a single-phase AC current.
  • the stacked core 100 is also used as an iron core provided in various devices.
  • the stacked core 100 may be, for example, an iron core provided in a transformer, a current transformer, a rotating electric machine, and a reactor.
  • stacked core 100 comprises multiple blocks 110a to 110e.
  • Each of blocks 110a to 110e has multiple steel plates stacked together with their plate surfaces facing each other.
  • the double-arrowed lines shown within multiple blocks 110a-110e indicate the direction of the main magnetic flux flowing through the steel sheet when the blocks 110a-110e are excited, or the rolling direction.
  • the direction of the main magnetic flux flowing through the steel sheet when the blocks 110a-110e are excited will be referred to as the main magnetic flux direction as necessary.
  • the main magnetic flux direction is determined by excluding the main magnetic flux flowing in each block in areas where the direction changes due to flow in and out of other blocks (i.e., the main magnetic flux direction is the direction in which the main magnetic flux travels straight). If the steel sheet is a grain-oriented electromagnetic steel sheet, it is preferable that the main magnetic flux direction and the rolling direction are as close as possible, and it is more preferable that they coincide. Also, if the steel sheet is a grain-oriented electromagnetic steel sheet, it is preferable that the rolling direction and the easy magnetization direction (direction parallel to the easy magnetization axis) are as close as possible, and it is more preferable that they coincide.
  • the main magnetic flux direction can be either the main magnetic flux direction or the rolling direction.
  • the steel plates are not stacked so that the direction of the double-headed arrows shown in the multiple blocks 110a to 110e is approximately parallel (preferably parallel) to the rolling direction of the steel plates, this means that the main magnetic flux direction (or rolling direction) is the main magnetic flux direction.
  • the rolling direction can be determined by observing the surface of the steel plates, so it is easy to determine the rolling direction.
  • the stacked core 100 is configured to have a two-fold symmetric relationship with its center line CL as the axis of rotational symmetry.
  • the center line CL is an imaginary straight line that passes through the position of the center of gravity of the stacked core 100 and extends in the stacking direction (z-axis direction) of the steel plates that make up the stacked core 100.
  • the stacking direction of the steel plates that make up the stacked core 100 will be abbreviated to the stacking direction as necessary.
  • a case where a plurality of blocks 110a to 110e are configured by stacking a plurality of grain-oriented electromagnetic steel sheets having the same steel type and sheet thickness is illustrated.
  • the steel sheets are not limited to grain-oriented electromagnetic steel sheets.
  • the steel sheets may be, for example, bi-directional electromagnetic steel sheets.
  • the steel sheets may be non-oriented electromagnetic steel sheets. At least one of the steel types and sheet thicknesses of the steel sheets configuring at least two of the plurality of blocks may be different. At least one of the steel types and sheet thicknesses of the plurality of steel sheets configuring one block may be different.
  • the thicknesses (lengths in the stacking direction (z-axis direction)) of the plurality of blocks 110a to 110e are the same is illustrated.
  • a case where the blocks 110a to 110b are configured and arranged to have a two-fold symmetric relationship with the center line CL as the axis of rotational symmetry is illustrated.
  • a case where the blocks 110c to 110d are configured and arranged to have a two-fold symmetric relationship with the center line CL as the axis of rotational symmetry is illustrated.
  • the number, shape, size, and arrangement of the blocks are determined according to the specifications of the device that includes the stacked core, and therefore are not limited to those illustrated in FIG.
  • the end faces of the multiple blocks 110a to 110e include block-facing end faces 111a to 111p.
  • the block-facing end faces 111a to 111p of the blocks 110a to 110e are the end faces of the blocks 110a to 110e that are positioned opposite each other.
  • the end faces of the block 110a include block-facing end faces 111a to 111d.
  • the end faces of the block 110b include block-facing end faces 111e to 111h.
  • the end faces of the block 110c include block-facing end faces 111i to 111j.
  • the end faces of the block 110d include block-facing end faces 111k to 111l.
  • the end faces of the block 110e include block-facing end faces 111o to 111p.
  • block opposing end faces arranged in a mutually opposing position are referred to as a pair of block opposing end faces.
  • block opposing end face 111a of block 110a and block opposing end face 111i of block 110c are arranged in a mutually opposing position. Therefore, these block opposing end faces 111a and 111i are a pair of block opposing end faces 111a and 111i.
  • the stacked core 100 illustrated in FIG. 1 has eight pairs of block opposing end faces: 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • a pair of block opposing end faces (for example, block opposing end faces 111a and 111i) is a so-called butt portion. Therefore, some or all of the areas of a pair of opposing end faces of blocks (two opposing end faces of blocks) are in contact with each other.
  • block opposing end faces 111a to 111p are separated by bending points that appear when linear approximations of lines representing block opposing end faces 111a to 111p that can be seen when stacked core 100 is viewed from the stacking direction (z-axis direction) are made (see block opposing end faces 111c and 111d, 111g and 111h, 111m and 111n, and 111o and 111p shown in FIG. 1).
  • the block opposing end faces 111a to 111p that can be seen when viewing the stacked core 100 from the stacking direction (z-axis direction) can be more accurately approximated by curve approximation (for example, approximation with a quadratic function) rather than linear approximation
  • the block opposing end faces may be divided at the positions that show the extreme values of the curve approximation.
  • the stacked core 100 of this embodiment will be described along with the findings of the inventors.
  • the findings of the inventors will be described using the symbols shown in FIG. 1.
  • the findings of the inventors are not limited to the stacked core 100 shown in FIG. 1.
  • Vibrations at the butt joints of blocks 110a to 110e have a large impact on the noise of stacked core 100.
  • the inventors focused on the shape of the steel plates in order to suppress such vibrations at the butt joints of blocks 110a to 110e without using a material other than the steel plates.
  • the inventors then discovered that by optimizing the roughness of block opposing end faces 111a to 111p, it is possible to suppress the noise of stacked core 100 by suppressing vibrations at the butt joints of blocks 110a to 110e (block opposing end faces 111a to 111p).
  • vibration of the block butt joints can be suppressed by satisfying the following formula (1) in at least one pair of block opposing end faces (two block opposing end faces) among multiple pairs of block opposing end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • Ra(D) is the surface roughness Ra ( ⁇ m) in the lamination direction (z-axis direction) of one of the pair of block opposing end faces (two block opposing end faces) to be calculated using formula (1).
  • the surface roughness determined for each block opposing end face in this manner is referred to as lamination direction surface roughness as necessary.
  • Ra(S) is the surface roughness Ra ( ⁇ m) in the main magnetic flux direction (or the rolling direction of the steel plate) of the plate surface having an end face that constitutes a part of the block opposing end face.
  • the surface roughness determined in this manner is referred to as in-plane direction surface roughness as necessary.
  • the surface roughness Ra (lamination direction surface roughness Ra(D) and in-plane direction surface roughness Ra(S)) is the average height Rc of the roughness curve element defined in JIS B 0601:2013.
  • the block opposing end face is composed of the end faces of multiple stacked steel plates.
  • the end face constituting a part of the block facing end face is the end face of one of the multiple steel plates.
  • the ( ⁇ m) in Ra( ⁇ m) indicates that the unit of surface roughness Ra is micrometers (this method of expressing units is the same for the other variables n, L, and n/L).
  • the in-plane surface roughness Ra(S) is, for example, 0.10 ⁇ m or more and 3.00 ⁇ m or less.
  • the pair of block opposing end faces (two block opposing end faces) for which formula (1) is calculated are the pair of block opposing end faces 111a and 111i.
  • formula (1) is satisfied for each of block opposing end faces 111a and 111i, then formula (1) is satisfied for each of one pair of block opposing end faces 111a and 111i.
  • Whether formula (1) is satisfied is similarly determined for the other pairs of block opposing end faces 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • FIGS. 2A to 2E are diagrams for explaining an example of the measurement position of the surface roughness Ra(D) in the lamination direction.
  • the y-z coordinates shown in Fig. 2A and Fig. 2D correspond to the y and z coordinates of the x-y-z coordinate system shown in Fig. 1.
  • the x-z coordinates shown in Fig. 2B, Fig. 2C, and Fig. 2E correspond to the x and z coordinates of the x-y-z coordinate system shown in Fig. 1.
  • block 110a shown in Fig. 2A and block 110b shown in Fig. 2D are configured and arranged to have a two-fold symmetric relationship with the center line CL of stacked core 100 as the axis of rotational symmetry.
  • block 110c shown in Fig. 2B and block 110d shown in Fig. 2D are configured and arranged to have a two-fold symmetric relationship with the center line CL of stacked core 100 as the axis of rotational symmetry
  • FIGS. 2A and 2D are diagrams showing an example of measurement positions for the stacking direction surface roughness Ra(D) of block facing end faces 111a-111d, 111e-111h of blocks 110a, 110b.
  • FIGS. 2B and 2E are diagrams showing an example of measurement positions for the stacking direction surface roughness Ra(D) of block facing end faces 111i-111j, 111k-111l of blocks 110c, 110d.
  • FIG. 2C is a diagram showing an example of measurement positions for the stacking direction surface roughness Ra(D) of block facing end faces 111m-111p of block 110e.
  • the surface roughness in the lamination direction, Ra(D), is measured on an imaginary straight line passing through the center positions of both ends of the opposing block end faces of the pair of opposing block end faces to be calculated using formula (1) when the opposing block end faces are viewed from the lamination direction of the steel plate having an end face that constitutes part of the opposing block end faces.
  • the stacking direction of the steel plates having end faces that form part of the block opposing end faces 111a to 111p is the z-axis direction.
  • the positions of the centers of both ends 113a and 113b, 113c and 113d, 113e and 113f, 113f and 113g, 113h and 113i, 113j and 113k, 113e and 113f, 113f and 113g, 113l and 113m, and 113m and 113n are positions 112a, 112b, 112c, 112d, 112e, 112f, 112g, and 112h, respectively.
  • the center positions of both ends of the opposing block end faces are obtained in the stacking direction (z-axis direction).
  • virtual straight lines 201a to 201p are obtained as shown in Figures 2A to 2E.
  • the stacking direction surface roughness Ra(D) of block opposing end faces 111a and 111i is measured on imaginary straight lines 201a and 201e, respectively, as shown in Figures 2A and 2B.
  • the roughness curves for calculating the stacking direction surface roughness Ra(D) of block opposing end faces 111b and 111l are measured on imaginary straight lines 201b and 201p, respectively, as shown in Figures 2A and 2E.
  • the roughness curves for calculating the stacking direction surface roughness Ra(D) of the block opposing end faces 111c and 111m are measured on the virtual straight lines 201c and 201g, respectively.
  • the roughness curves for calculating the stacking direction surface roughness Ra(D) of the block opposing end faces 111d and 111n are measured on the virtual straight lines 201d and 201h, respectively.
  • lamination direction measurement positions are the positions of the bevel cut surfaces as shown in FIGS. 2A to 2E.
  • the multiple steel plates constituting one of the pair of block opposing end faces to be calculated using formula (1) are extracted one by one, and the stacking direction surface roughness Ra (D) of the extracted steel plate is measured at the stacking direction measurement position.
  • the stacking direction surface roughness Ra (D) of the steel plate before stacking used to construct the block having the one block opposing end face may be measured at the stacking direction measurement position.
  • Such measurements are performed for all steel plates constituting the one block opposing end face. For example, if the number of stacked sheets is 200, 200 stacking direction surface roughnesses Ra (D) are measured for one block opposing end face.
  • the representative value of the multiple stacking direction surface roughnesses Ra (D) measured in this manner is taken as the stacking direction surface roughness Ra (D) of the one block opposing end face.
  • the representative value is, for example, the arithmetic mean value. Instead of the arithmetic mean value, a median value or the like may be used.
  • the stacking direction surface roughness Ra(D) of the other block facing end face of the pair of block facing end faces being calculated using formula (1) is calculated in the same manner as the stacking direction surface roughness Ra(D) of one block facing end face.
  • the lamination direction surface roughness Ra(D) of one and the other of a pair of block opposing end faces is calculated in the above manner for each of block opposing end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • FIGS. 3A to 3E are diagrams illustrating an example of measurement positions of a roughness curve for calculating the in-plane surface roughness Ra(S).
  • the x-y coordinates shown in FIG. 3A to FIG. 3E correspond to the x-coordinate and y-coordinate of the x-y-z coordinate system shown in FIG. 1.
  • Figures 3A and 3D are diagrams showing an example of measurement positions of roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces constituting part of the block-facing end faces 111a-111d, 111e-111h of blocks 110a and 110b.
  • Figures 3B and 3E are diagrams showing an example of measurement positions of roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces constituting part of the block-facing end faces 111i-111j, 111k-111l of blocks 110c and 110d.
  • Figure 3C is a diagram showing an example of measurement positions of roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces constituting part of the block-facing end faces 111m-111p of block 110e.
  • the direction perpendicular to the main magnetic flux direction (or rolling direction) and lamination direction of the steel plate is referred to as the width direction as necessary.
  • the roughness curve for calculating the in-plane surface roughness Ra(S) is measured on a virtual straight line that passes through the center position in the width direction of the steel plate and extends along the main magnetic flux direction (or rolling direction) of the steel plate on the plate surface having end faces that form part of the opposing end faces of the pair of blocks to be calculated using formula (1).
  • the lamination direction of the steel plates having end faces that constitute part of the block-facing end faces 111a to 111p is the z-axis direction.
  • the main magnetic flux direction (or rolling direction) of the steel plates that constitute part of the block-facing end faces 111a to 111d, 111e to 111h is the y-axis direction (the direction of the double-headed arrow in FIG. 1).
  • the width direction of the steel plates that constitute part of the block-facing end faces 111a to 111d, 111e to 111h is the x-axis direction.
  • the main magnetic flux direction (or rolling direction) of the steel plates that constitute part of the block-facing end faces 111i to 111j, 111k to 111l, 111m to 111p is the x-axis direction (the direction of the double-headed arrow in FIG. 1).
  • the width direction of the steel plates that constitute part of the block-facing end faces 111i to 111j, 111k to 111l, 111m to 111p is the y-axis direction.
  • the imaginary line that passes through the center in the width direction (x-axis direction) of a steel plate having end faces that form part of the block-facing end faces 111a to 111d and extends along the main magnetic flux direction (or rolling direction, y-axis direction) of the steel plate is imaginary line 301a.
  • the imaginary line that passes through the center in the width direction (x-axis direction) of a steel plate having end faces that form part of the block-facing end faces 111e to 111h and extends along the main magnetic flux direction (or rolling direction, y-axis direction) of the steel plate is imaginary line 301d.
  • the imaginary line that passes through the center in the width direction (y-axis direction) of a steel plate having an end face that constitutes part of the block-facing end faces 111i to 111j and extends along the main magnetic flux direction (or rolling direction, x-axis direction) of the steel plate is imaginary line 301b.
  • the imaginary line that passes through the center in the width direction (y-axis direction) of a steel plate having an end face that constitutes part of the block-facing end faces 111k to 111l and extends along the main magnetic flux direction (or rolling direction, x-axis direction) of the steel plate is imaginary line 301e.
  • the imaginary line that passes through the center position in the width direction (y-axis direction) of the steel plate having an end face that constitutes part of the block-facing end faces 111m to 111p and extends along the main magnetic flux direction (or rolling direction, x-axis direction) of the steel plate is imaginary line 301c.
  • the roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces that constitute part of the block-facing end faces 111a-111d and 111e-111h are measured on the imaginary straight lines 301a and 301d, respectively.
  • the roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces that constitute part of the block-facing end faces 111i-111j and 111k-111l are measured on the imaginary straight lines 301b and 301e, respectively.
  • the roughness curves for calculating the in-plane surface roughness Ra(S) of a steel plate having end faces that constitute part of the block-facing end faces 111m-111p are measured on the imaginary straight line 301c.
  • the virtual line may be separated into multiple lines depending on the shape of the steel plate.
  • the roughness curve is measured on any one of the multiple separated virtual lines.
  • the roughness curve may be measured on the multiple virtual lines as if the multiple virtual lines were not separated (i.e., the distance between the multiple virtual lines is set to 0 (zero)).
  • in-plane measurement positions the positions of the virtual straight lines 301a to 301e where the roughness curve (roughness curve elements) for calculating the in-plane surface roughness Ra(S) are measured will be referred to as in-plane measurement positions as necessary.
  • the multiple steel plates constituting one of the pair of block opposing end faces to be calculated using formula (1) are extracted one by one, and the in-plane surface roughness Ra(S) of the extracted steel plate is measured at the in-plane measurement position.
  • the in-plane surface roughness Ra(S) of the steel plate before lamination used to construct the block having the one of the block opposing end faces may be measured at the in-plane measurement position.
  • Such measurements are performed for each of all steel plates constituting the one of the block opposing end faces. For example, if the number of stacked sheets is 200, 200 in-plane surface roughnesses Ra(S) are measured for one of the block opposing end faces.
  • the representative value of the multiple in-plane surface roughnesses Ra(S) measured in this manner is taken as the in-plane surface roughness Ra(S) of the one of the block opposing end faces.
  • the representative value is, for example, the arithmetic mean value. Instead of the arithmetic mean value, a median value or the like may be used.
  • the in-plane surface roughness Ra(S) of the other of the pair of opposing block end faces that are the subject of calculation of equation (1) is calculated in the same manner as the in-plane surface roughness Ra(S) of one of the opposing block end faces.
  • the in-plane surface roughness Ra(S) of one and the other of a pair of opposing block end faces is calculated in the above manner for each of the pairs of opposing block end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • a roughness curve (roughness curve element) is measured.
  • the roughness curve (roughness curve element) is measured, for example, for each of the multiple steel plates that make up the opposing end face of one block.
  • the roughness curve (roughness curve element) is measured at each of the stacking direction measurement position and the in-plane direction measurement position.
  • the number of laminated sheets is 200
  • 200 roughness curves (roughness curve elements) are measured for one block-facing end face as a roughness curve (roughness curve element) for calculating the laminate direction surface roughness Ra (D).
  • the representative value of the multiple roughness curves (200 in the above example) measured in the above manner is used as the roughness curve for calculating the laminate direction surface roughness Ra (D) of the one block-facing end face.
  • the representative value of the multiple roughness curves (200 in the above example) is calculated by calculating the representative value of the values at the same position in the plate thickness direction in each of the multiple roughness curves.
  • the representative value is, for example, the arithmetic mean value.
  • a median value or the like may be used.
  • a roughness curve obtained by joining multiple roughness curves (200 in the above example) may be used as the roughness curve (roughness curve element) for calculating the laminate direction surface roughness Ra (D).
  • the roughness curves for calculating the in-plane surface roughness Ra(S) are measured for all steel plates having end faces that constitute a part of one block facing end face, for example. For example, if the number of laminated sheets is 200, 200 roughness curves are measured for one block facing end face as roughness curves for calculating the in-plane surface roughness Ra(S). The representative value of the multiple roughness curves (200 in the above example) measured in this manner is used as the roughness curve for calculating the in-plane surface roughness Ra(S) of the steel plate having an end face that constitutes a part of the block facing end face.
  • the representative value of the multiple roughness curves can be obtained, for example, by calculating the calculated average value of values at the same position (x coordinate and y coordinate) in the plate surface direction.
  • the representative value is, for example, the arithmetic mean value.
  • the median value or the like may be used instead of the arithmetic mean value.
  • the measurement magnification is set to 200 times so that the width of one field of view is 500 ⁇ m ⁇ 500 ⁇ m.
  • the measurement magnification is preferably 100 times or more, and more preferably 500 times to 700 times.
  • Ra(D)/Ra(S) Using the in-plane surface roughness Ra(S) and the stacking direction surface roughness Ra(D) calculated for the same block facing end face, Ra(D)/Ra(S) is calculated, and it is confirmed whether the calculated Ra(D)/Ra(S) satisfies formula (1).
  • the method for satisfying formula (1) may be any method capable of adjusting the roughness of the end surface of the steel sheet.
  • the roughness of the end surface of the steel sheet is adjusted by, for example, any one of grinding, cutting, and polishing.
  • the roughness of the end faces of each steel plate may be adjusted.
  • the roughness of the end faces of each steel plate cut into the planar shapes of the blocks 110a to 110e may be adjusted.
  • the roughness of the end faces of each steel plate may be adjusted by controlling the clearance between the upper and lower blades of the shearing machine.
  • the roughness of the end faces corresponding to the block-facing end faces 111a to 111p may be adjusted. Also, any two or more of these may be combined.
  • the end faces corresponding to the block-facing end faces 111a to 111p satisfy formula (1). If formula (1) is not satisfied, the roughness of the end faces may be readjusted. Also, after disassembling the stacked multiple steel plates, the roughness of the end face of each steel plate may be readjusted. Also, without adjusting the roughness of the end faces of the steel plates before stacking the multiple steel plates, it may be confirmed whether the end faces corresponding to the block-facing end faces 111a to 111p satisfy formula (1) after stacking the multiple steel plates. If formula (1) is not satisfied, the roughness of the end faces may be adjusted so that formula (1) is satisfied.
  • At least one pair of block opposing end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p satisfy formula (1) (preferably also formula (2)).
  • the inventors also focused on the crystal grains of the steel plate in order to suppress vibrations at the butt joints (block-facing end faces) of the blocks 110a to 110e without using a material other than the steel plate.
  • the end faces of the steel plate having end faces constituting part of the block-facing end faces 111a to 111p are referred to as the steel plate-facing end faces as necessary.
  • the number of crystal grains present in the steel plate having the steel plate-facing end face that includes the steel plate-facing end face as a boundary is referred to as the number of crystal grains on the steel plate-facing end face as necessary.
  • the value obtained by dividing the number of crystal grains on the steel plate-facing end face by the length of the steel plate-facing end face is referred to as the number of crystal grains per unit length on the steel plate-facing end face as necessary.
  • the number of crystal grains on the steel plate-facing end face is n (pieces).
  • the length of the steel plate-facing end face is L (mm). Then, the number of crystal grains per unit length on the steel plate-facing end face is n/L (pieces/mm).
  • the inventors investigated the relationship between the number of crystal grains per unit length n/L on the steel plate facing end face and the noise level of the stacked core 100.
  • the number of crystal grains per unit length n/L on the steel plate facing end face was calculated as follows. First, the number of crystal grains per unit length n/L on the steel plate facing end face was calculated for all steel plates having an end face constituting a part of one of the pair of block facing end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, and 111h and 111p.
  • the arithmetic mean value of the number of crystal grains per unit length n/L on the calculated steel plate facing end face was calculated as the number of crystal grains per unit length n/L on the steel plate facing end face at the one of the block facing end faces.
  • the inventors have found that the noise level of the stacked core 100 changes significantly due to the vibration of the butt joints of the blocks 110a to 110e (block facing end faces 111a to 111p) when the number n/L per unit length on the steel plate facing end face is 0.5 (pieces/mm).
  • vibration of the stacked core 100 can be suppressed by satisfying the following formula (3) in at least one of the pair of block opposing end faces 111a and 111i, 111b and 111l, 111c and 111m, 111d and 111n, 111e and 111k, 111f and 111j, 111g and 111o, or 111h and 111p (preferably both of the block opposing end faces).
  • n / L ⁇ 0.5 ...
  • Figures 4A to 4D are diagrams illustrating an example of the number n of crystal grains on the opposing end faces of the steel plate and the length L of the opposing end faces of the steel plate.
  • FIGS. 4A and 4D are diagrams for explaining the number n of crystal grains on the steel plate facing end faces constituting part of the block facing end faces 111a-111d, 111e-111h of blocks 110a and 110b, and the length L of the steel plate facing end faces.
  • FIGS. 4B and 4E are diagrams for explaining the number n of crystal grains on the steel plate facing end faces constituting part of the block facing end faces 111i-111j, 111k-111l of blocks 110c and 110d, and the length L of the steel plate facing end faces.
  • FIG. 4C is a diagram for explaining the number n of crystal grains on the steel plate facing end faces constituting part of the block facing end faces 111m-111p of block 110e, and the length L of the steel plate facing end faces.
  • a crystal grain group 401a consisting of five crystal grains is shown as an example of crystal grains that include the steel plate facing end face as a boundary among the crystal grains present in one of the steel plates having a steel plate facing end face that constitutes part of the block facing end face 111a.
  • the number n of crystal grains on the steel plate facing end face that constitutes part of the block facing end face 111a is 5.
  • the number n of crystal grains on the steel plate facing end faces that constitute part of the block facing end faces 111b to 111p other than the block facing end face 111a is also counted in the same manner.
  • 4A to 4E show crystal grain groups 401b, 401c, 401d, 401e, 401f, 401g, 401h, 401i, 401j, 111m, 111n, 111o, 111p, 111e, 111f, 111g, 111h, 111k, and 111l, which are crystal grain groups that include the steel plate facing end face as a boundary, and are made up of four, three, five, seven, six, five, four, four, three, five, four, three, five, seven, and six crystal grains, respectively, among the crystal grains present in one steel plate among the steel plates having the steel plate facing end face that constitutes a part of the block facing end faces 111b, 111c, 111d, 111i, 111j, 111m, 111
  • the method for counting the number n of crystal grains on the opposing end surface of the steel plate may be any method capable of measuring the number of crystal grains.
  • the number n of crystal grains on the opposing end surface of the steel plate may be counted by observing with an electron microscope or an optical microscope as follows. First, the opposing end surface (cut surface) of the steel plate is corroded with a 5% nital solution for 100 to 300 seconds, and then the grain boundaries are observed with an optical microscope.
  • an optical microscope for example, an industrial microscope BX53M manufactured by Olympus Corporation may be used.
  • the length L of the steel plate facing end face is the length of the steel plate facing end face as seen when the steel plate having the steel plate facing end face is viewed in a direction perpendicular to the plate surface of the steel plate (perpendicular to the paper surface of Figures 4A to 4E).
  • Figure 4A shows that the length L of the steel plate facing end face constituting part of the block facing end face 111a is length L1.
  • the length L of the steel plate facing end faces constituting part of the block facing end faces 111b to 111p other than the block facing end face 111a is measured in the same manner.
  • L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13, L14, L15, and L16 are shown as the length L of the steel plate facing end faces constituting part of the block facing end faces 111b, 111c, 111d, 111i, 111j, 111m, 111n, 111o, 111p, 111e, 111f, 111g, 111h, 111k, and 111l, respectively.
  • the method for measuring the length L of the opposing end faces of the steel plate may be any method capable of measuring the length of the end faces of the steel plate.
  • the length L of the opposing end faces of the steel plate may be measured by direct measurement using a vernier caliper or the like.
  • the length L of the opposing end faces of the steel plate may also be measured by indirect measurement using image analysis or the like.
  • the crystal grain size of the steel sheet may be controlled to satisfy formula (3) by controlling at least one of the amount of nitriding during nitriding annealing for controlling precipitates and texture, and the annealing temperature and holding time (relationship between annealing temperature and time) during finish annealing for causing secondary recrystallization.
  • the crystal grain size of the steel sheet may be controlled to satisfy formula (3) by performing at least one of the following: adjusting the flow rate of ammonia supplied to the atmosphere during nitriding annealing, adjusting (lengthening) the soaking time during finish annealing, and providing a holding time before reaching the soaking temperature during finish annealing and adjusting the holding time.
  • FIG. 5 is a flowchart showing an example of a method for manufacturing the stacked core 100 of this embodiment.
  • a steel plate manufacturing process is performed.
  • steel plates constituting the stacked core 100 are manufactured.
  • a known method may be adopted as a method for manufacturing the steel plates.
  • the crystal grain size of the steel plate is controlled so as to satisfy the formula (3).
  • the annealing conditions may be controlled to control the crystal grain size of the steel plate.
  • step S502 a cutting process is performed.
  • the steel plate manufactured in step S501 is cut.
  • the steel plate manufactured in step S501 is cut so that the shape of the plate surface of the steel plate after cutting becomes the planar shape of blocks 110a to 110e (the shape of the x-y plane shown in FIG. 1).
  • a known method may be adopted as a method for cutting the steel plate.
  • the steel plate may be cut by punching.
  • the steel plate may be cut by laser processing.
  • the number of steel plates cut at one time in the cutting process is not limited.
  • the steel plates may be cut one by one. Multiple steel plates may be cut at once.
  • step S503 a grain measurement process is performed.
  • the number of grains n/L per unit length on the steel plate facing end face is calculated (measured), and it is confirmed whether or not formula (3) is satisfied.
  • the number of grains n on the steel plate facing end face of the steel plate cut in step S502 and the length L of the steel plate facing end face are measured.
  • the number of grains n/L per unit length on the steel plate facing end face is calculated.
  • the determination of whether or not formula (3) is satisfied is performed for each of the block facing end faces 111a to 111p.
  • a representative value e.g., the arithmetic mean value
  • a representative value e.g., the arithmetic mean value
  • At least one of the calculation of the number of crystal grains per unit length on the opposing end face of the steel plate n/L and the determination of whether the number of crystal grains per unit length on the opposing end face of the steel plate n/L satisfies formula (3) may be performed by a computer.
  • information including the number of crystal grains n on the opposing end face of the steel plate and the length L of the opposing end face of the steel plate may be input to a computer.
  • at least one of the calculation of the number of crystal grains per unit length on the opposing end face of the steel plate n/L and the determination of whether the number of crystal grains per unit length on the opposing end face of the steel plate n/L satisfies formula (3) may be performed manually.
  • step S501 If the number of crystal grains per unit length on the opposing end faces of the steel plate, n/L, does not satisfy formula (3), for example, step S501 is performed again. In this case, only steel plates that do not satisfy formula (3) are produced in step S501.
  • a first roughness measurement process is performed in step S504.
  • the in-plane surface roughness Ra(S) of the steel plate cut in step S502 is calculated (measured).
  • the roughness curve of the steel plate cut in step S502 is measured at the in-plane measurement position (the position of the virtual straight lines 301a to 301e). Then, based on the roughness curve at the in-plane measurement position, the in-plane surface roughness Ra(S) is calculated.
  • the calculation of the in-plane surface roughness Ra(S) is performed, for example, for all the steel plates constituting the blocks 110a to 110e.
  • the calculation of the in-plane surface roughness Ra(S) may be performed by a computer.
  • the calculation of the in-plane surface roughness Ra(S) may also be performed by a person.
  • step S505 a second roughness measurement process is performed.
  • the lamination direction surface roughness Ra(D) of the block facing end face of the block having the steel plate to be measured for the in-plane direction surface roughness Ra(S) is calculated (measured).
  • all the steel plates constituting a certain block are taken out from the steel plates cut in step S502.
  • the roughness curve of the steel plate constituting the block is measured at the lamination direction measurement position (position on the virtual straight lines 201a to 201p).
  • the lamination direction surface roughness Ra(D) is calculated based on the roughness curve at the lamination direction measurement position.
  • the lamination direction surface roughness Ra(D) is calculated, for example, for all the block facing end faces 111a to 111p of all the blocks 110a to 110e constituting the stacked core 100.
  • the lamination direction surface roughness Ra(D) may be calculated by a computer. Additionally, the calculation of the layer direction surface roughness Ra(D) may be performed manually.
  • step S506 a roughness adjustment process is performed.
  • the roughness adjustment process it is determined whether or not each of the pair of opposing end faces of the blocks satisfies formula (1) (preferably also formula (2)), and the surface roughness of the opposing end faces of the blocks that do not satisfy formula (1) (preferably also formula (2)) is adjusted.
  • the in-plane surface roughness Ra(S) and the stacking direction surface roughness Ra(D) calculated (measured) for a pair of block opposing end faces are used to determine whether or not each of the pair of block opposing end faces satisfies formula (1) (preferably also formula (2)). This determination is made, for example, for all block opposing end faces 111a to 111p of blocks 110a to 110e. This determination may also be made by a computer. This determination may also be made by a person.
  • the roughness of the steel plate facing end faces that do not satisfy formula (1) (and preferably formula (2)) is adjusted.
  • the adjustment of the roughness of the steel plate end faces is performed, for example, on all of the block facing end faces 111a to 111p of blocks 110a to 110e that do not satisfy formula (1) (and preferably formula (2)).
  • At least one pair of block opposing end faces (for example, a pair of block opposing end faces 111a and 111i) is made to satisfy 1 ⁇ Ra(D)/Ra(S) ⁇ 12. Therefore, it is possible to provide a stacked core that can suppress vibration without using a material other than steel plate. Furthermore, if 1 ⁇ Ra(D)/Ra(S) ⁇ 12 is changed to 6 ⁇ Ra(D)/Ra(S) ⁇ 8, the noise suppression effect of the stacked core 100 can be more reliably improved.
  • the number of crystal grains per unit length on the steel plate facing end surface, n/L is set to 0.5 or less on at least one of at least one pair of block facing end surfaces (e.g., block facing end surfaces 111a and 111i). Therefore, vibration of the stacked core can be further suppressed.
  • the present invention is not limited to this embodiment.
  • the various conditions shown in this embodiment are example conditions adopted to confirm the feasibility and effects of the present invention. Therefore, the present invention is not limited to the example conditions shown in this embodiment.
  • various conditions may be adopted in the present invention as long as they do not deviate from the gist of the present invention and achieve the object of the present invention.
  • Grain-oriented electrical steel sheets were produced using slabs of steel types A to E having the chemical compositions shown in Table 1.
  • the units of values shown in Table 1 are mass %.
  • the balance of each slab (chemical components other than those shown in Table 1) is Fe.
  • Grain-oriented electrical steel sheets were manufactured using slabs of steel types A to E using the manufacturing process and conditions shown in Table 2.
  • the hot rolling process, hot-rolled sheet annealing process, cold rolling process, decarburization annealing process, nitriding treatment (nitriding annealing) process, and finish annealing process were carried out in this order under the manufacturing conditions shown in Table 2.
  • the cold-rolled steel sheet after decarburization annealing was subjected to nitriding treatment (nitriding annealing) in a mixed atmosphere of hydrogen, nitrogen, and ammonia.
  • the amount of nitriding was adjusted by adjusting the flow rate of ammonia using ammonia nitriding.
  • an annealing separator containing magnesia or alumina as its main component was applied to the cold-rolled steel sheet, and finish annealing was performed.
  • the annealing separator multiple types of annealing separators with different mixture ratios of components including the main component were used.
  • the annealing temperature during finish annealing and the holding time at the annealing temperature were adjusted.
  • the crystal grain size of the steel sheet after finish annealing was controlled by the amount of nitriding in the nitriding treatment and the annealing temperature and holding time during finish annealing.
  • An insulating coating solution was applied onto the primary coating formed on the surface of the steel sheet after final annealing.
  • a solution containing chromium and whose main components were phosphate and colloidal silica was used as the insulating coating solution.
  • the steel sheet to which the insulating coating solution was applied was heat treated to form an insulating coating.
  • grain-oriented electrical steel sheets were manufactured from slabs of steel types A to E in the manner described above. In the following explanation, the grain-oriented electrical steel sheets manufactured from slabs of steel types A to E will be referred to as steel sheets of steel types A to E as necessary.
  • FIG. 1 A stacked core 100 having the shape shown in FIG. 1 was manufactured using steel plates of steel type A as a material.
  • the inventors have found that there is a directly proportional relationship between Ra(D)/Ra(S) shown in formula (1) and the clearance.
  • the roughness of the end surface of the steel plate of steel type A was adjusted by controlling the clearance between the upper and lower blades of a shearing machine.
  • the steel plates of steel type A having the planar shapes of the blocks 110a to 110e were stacked to manufacture the blocks 110a to 110e.
  • a plurality of sets of blocks 110a to 110e in which the roughness of the block facing end surfaces 111a to 111p differed from each other were manufactured.
  • a plurality of sets of blocks 110a to 110e were manufactured for the steel plates of steel types B to E.
  • blocks manufactured from steel plates of steel types A to E will be referred to as blocks of steel types A to E, as necessary.
  • blocks 110a, 110b, 110c, 110d, and 110e will be referred to as upper block 110a, lower block 110b, left block 110c, center block 110d, and right block 110e, as necessary.
  • the stacked core 100 was manufactured by combining blocks 110a-110e manufactured from steel plates of the same steel type.
  • the stacked core 100 manufactured in this manner will be referred to as stacked core 100 of steel types A-E as necessary.
  • the left block 110c, center block 110d, and right block 110e, and the upper block 110a and lower block 110b were considered as blocks manufactured from steel plates of different steel types, and the stacked core 100 was manufactured by combining blocks 110a-110e.
  • stacked cores 100 of steel types A and B, stacked cores 100 of steel types A and D, stacked cores 100 of steel types B and C, and stacked cores 100 of steel types B and E were manufactured.
  • the stacked core 100 of steel types A and B is a stacked core in which the left block 110c, the center block 110d, and the right block 110e are made of steel type A, and the upper block 110a and the lower block 110b are made of steel type B.
  • the stacked core 100 of steel types A and D is a stacked core in which the left block 110c, the center block 110d, and the right block 110e are made of steel type A, and the upper block 110a and the lower block 110b are made of steel type D.
  • the stacked core 100 of steel types B and C is a stacked core in which the left block 110c, the center block 110d, and the right block 110e are made of steel type B, and the upper block 110a and the lower block 110b are made of steel type C.
  • the stacked core 100 of steel types B and E is a stacked core in which the left block 110c, the center block 110d, and the right block 110e are made of steel type E, and the upper block 110a and the lower block 110b are made of
  • the width (length in the y-axis direction), height (length in the x-axis direction), and thickness (length in the z-axis direction) of the stacked core 100 were 750 mm, 750 mm, and approximately 41 mm, respectively.
  • the widths (lengths in the x-axis direction) of the upper block 110a and the lower block 110b, and the widths (lengths in the y-axis direction) of the left block 110c, the center block 110d, and the right block 110e were 150 mm.
  • the lengths L (L1 to L15) of the steel plate facing end faces of the steel plates of steel types A to E having the planar shapes of the blocks 110a to 110e were measured with a vernier caliper.
  • the steel plate facing end faces (sheared surfaces) of the steel plates were corroded with a 5% nital solution for 100 to 300 seconds.
  • the steel plate facing end faces were then observed with an industrial microscope BX53M manufactured by Olympus Corporation to count the number of crystal grain boundaries present on the steel plate facing end faces.
  • the number of crystal grains n on the steel plate facing end faces was calculated by adding 1 to the counted number.
  • the number of crystal grains n/L per unit length on the steel plate facing end faces was calculated from the length L of the steel plate facing end faces and the number of crystal grains n on the steel plate facing end faces obtained from the same steel plate.
  • the number of crystal grains n/L per unit length on the steel plate facing end faces was calculated individually for all the steel plates constituting the blocks 110a to 110e. Then, the arithmetic mean value of the number n/L of crystal grains per unit length on the steel plate facing end face was calculated for each of the block facing end faces 111a to 111p.
  • the arithmetic mean value of the number n/L of crystal grains per unit length on the steel plate facing end face calculated for one block facing end face was taken as the number n/L of crystal grains per unit length on the steel plate facing end face for that block facing end face.
  • the lamination direction surface roughness Ra(D) and in-plane direction surface roughness Ra(S) were calculated in accordance with JIS B 0601:2013.
  • each block facing end face 111a-111p of each stacked core 100 the multiple steel plates constituting that block facing end face were extracted one by one, and the stacking direction surface roughness Ra(D) of the extracted steel plate was measured at the stacking direction measurement position (position on the imaginary line 201a-201p) using a one-shot 3D shape measuring instrument (model name: VR-6000) manufactured by Keyence Corporation.
  • the arithmetic average value of the stacking direction surface roughness Ra(D) of that block facing end face calculated from the multiple steel plates constituting the same block facing end face was calculated as the stacking direction surface roughness Ra(D) of that block facing end face.
  • each block facing end face 111a-111p of each stacked core 100 the multiple steel plates constituting that block facing end face were extracted one by one, and the in-plane surface roughness Ra(S) of the extracted steel plate was measured at the in-plane measurement positions (positions on the imaginary lines 301a-301e) using a one-shot 3D shape measuring instrument (model name: VR-6000) manufactured by Keyence Corporation.
  • the arithmetic average value of the in-plane surface roughness Ra(S) of that block facing end face calculated from the multiple steel plates constituting the same block facing end face was calculated as the in-plane surface roughness Ra(S) of that block facing end face.
  • Ra(D)/Ra(S) of the same block opposing end face was calculated from the lamination direction surface roughness Ra(D) and the in-plane direction surface roughness Ra(S) of that block opposing end face. This calculation of Ra(D)/Ra(S) was performed for all block opposing end faces 111a to 111p of all stacked cores 100 manufactured as described above.
  • Tables 3 and 4 show the n/L, Ra(D)/Ra(S) and noise values of each stacked core 100 obtained in this manner.
  • 111a to 111p indicate the block facing end surfaces 111a to 111p shown in Figures 1, 2A to 2E, 3A to 3E, and 4A to 4E.
  • steel types B to E in which the number of crystal grains per unit length on the opposing end faces of the steel plate, n/L, is 0.5 or less, have lower noise levels than steel type A, in which the number is over 0.5.
  • numbers 25 to 28 have lower noise levels than number 4 (steel type A).
  • numbers 29 to 32 have lower noise levels than number 12 (steel type A).
  • numbers 33 to 36 have lower noise levels than number 13 (steel type A).
  • noise was reduced in numbers 45 and 46 (steel types A and B) compared to number 2 (steel type A). Noise was reduced in number 47 (numbers B and C) compared to numbers 21 (steel type B) and 22 (steel type C). Noise was reduced in number 48 (numbers B and E) compared to numbers 21 (steel type B) and 26 (steel type E).
  • the present invention can be used, for example, in equipment that has an iron core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Selon la présente invention, 1 < Ra (D)/Ra (S) ≦ 12 est satisfaite dans chacune d'au moins une paire de faces d'extrémité opposées de bloc (par exemple, une paire de faces d'extrémité opposées de bloc (111a, 111i)). Ici, Ra (D) est la rugosité de surface de la face d'extrémité opposée de bloc dans la direction d'empilement. Ra (S) est la rugosité de surface dans la direction de flux magnétique principale (ou direction de roulement) de la surface de plaque d'une plaque d'acier ayant une face d'extrémité qui configure une partie de la face d'extrémité opposée de bloc.
PCT/JP2023/035358 2022-10-03 2023-09-28 Noyau de fer empilé et procédé de fabrication de noyau de fer empilé WO2024075621A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-159532 2022-10-03
JP2022159532 2022-10-03

Publications (1)

Publication Number Publication Date
WO2024075621A1 true WO2024075621A1 (fr) 2024-04-11

Family

ID=90607780

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/035358 WO2024075621A1 (fr) 2022-10-03 2023-09-28 Noyau de fer empilé et procédé de fabrication de noyau de fer empilé

Country Status (1)

Country Link
WO (1) WO2024075621A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378509A (ja) * 1986-09-20 1988-04-08 Mitsubishi Electric Corp 静止誘導機器用鉄心
JPH11124629A (ja) * 1997-10-16 1999-05-11 Kawasaki Steel Corp 低鉄損・低騒音方向性電磁鋼板
JP2002164225A (ja) * 2000-11-28 2002-06-07 Nippon Steel Corp 低騒音電磁鋼板および積層鉄心
JP2007002334A (ja) * 2005-05-09 2007-01-11 Nippon Steel Corp 低鉄損方向性電磁鋼板およびその製造方法
WO2017171013A1 (fr) * 2016-03-31 2017-10-05 新日鐵住金株式会社 Tôle d'acier magnétique à grains orientés
JP2017532447A (ja) * 2014-08-28 2017-11-02 ポスコＰｏｓｃｏ 方向性電磁鋼板の磁区微細化方法と磁区微細化装置およびこれから製造される方向性電磁鋼板
WO2019182149A1 (fr) * 2018-03-22 2019-09-26 日本製鉄株式会社 Tôle d'acier électrique à grains orientés et procédé de production de tôle d'acier électrique à grains orientés

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378509A (ja) * 1986-09-20 1988-04-08 Mitsubishi Electric Corp 静止誘導機器用鉄心
JPH11124629A (ja) * 1997-10-16 1999-05-11 Kawasaki Steel Corp 低鉄損・低騒音方向性電磁鋼板
JP2002164225A (ja) * 2000-11-28 2002-06-07 Nippon Steel Corp 低騒音電磁鋼板および積層鉄心
JP2007002334A (ja) * 2005-05-09 2007-01-11 Nippon Steel Corp 低鉄損方向性電磁鋼板およびその製造方法
JP2017532447A (ja) * 2014-08-28 2017-11-02 ポスコＰｏｓｃｏ 方向性電磁鋼板の磁区微細化方法と磁区微細化装置およびこれから製造される方向性電磁鋼板
WO2017171013A1 (fr) * 2016-03-31 2017-10-05 新日鐵住金株式会社 Tôle d'acier magnétique à grains orientés
WO2019182149A1 (fr) * 2018-03-22 2019-09-26 日本製鉄株式会社 Tôle d'acier électrique à grains orientés et procédé de production de tôle d'acier électrique à grains orientés

Similar Documents

Publication Publication Date Title
JP6690739B2 (ja) 巻鉄心、及びその製造方法
JP6776952B2 (ja) 巻鉄心
KR101553497B1 (ko) 방향성 전자 강판 및 그 제조 방법
JP7028242B2 (ja) 方向性電磁鋼板およびこれを用いてなる変圧器の巻鉄心並びに巻鉄心の製造方法
JP7009937B2 (ja) 巻鉄心のｂｆ推定方法
JP2018157142A (ja) 方向性電磁鋼板の選別方法、及び、巻鉄心の製造方法
JP2019024039A (ja) 巻鉄心
CN111566232B (zh) 方向性电磁钢板
WO2024075621A1 (fr) Noyau de fer empilé et procédé de fabrication de noyau de fer empilé
KR20200103091A (ko) 방향성 전자 강판 및 이것을 이용하여 이루어지는 변압기의 적철심과 적철심의 제조 방법
CN110326068B (zh) 变压器铁芯
TW202430660A (zh) 積層鐵心及積層鐵心的製造方法
JP7103553B1 (ja) 巻鉄心
WO2022092095A1 (fr) Noyau enroulé
EP3863031B1 (fr) Noyau enroulé
TW202226281A (zh) 捲鐵心、捲鐵心之製造方法及捲鐵心製造裝置
JP7107470B1 (ja) 巻鉄心、巻鉄心の製造方法及び巻鉄心製造装置
WO2023058655A1 (fr) Noyau de fer enroulé
JP7538440B2 (ja) 巻鉄心
JP7188662B2 (ja) 巻鉄心
WO2022092118A1 (fr) Noyau enroulé
RU2805169C1 (ru) Ленточный сердечник, способ изготовления ленточного сердечника и устройство изготовления ленточных сердечников
JP7530010B2 (ja) 巻鉄心の製造方法及び製造装置
JPH09275022A (ja) 磁気特性の優れた低騒音鉄心
JP2022069937A (ja) 巻鉄心

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23874748

Country of ref document: EP

Kind code of ref document: A1