WO2020129935A1 - 積層コアおよび回転電機 - Google Patents
積層コアおよび回転電機 Download PDFInfo
- Publication number
- WO2020129935A1 WO2020129935A1 PCT/JP2019/049282 JP2019049282W WO2020129935A1 WO 2020129935 A1 WO2020129935 A1 WO 2020129935A1 JP 2019049282 W JP2019049282 W JP 2019049282W WO 2020129935 A1 WO2020129935 A1 WO 2020129935A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive
- core
- electromagnetic steel
- back portion
- core back
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 139
- 239000010959 steel Substances 0.000 claims abstract description 139
- 239000000853 adhesive Substances 0.000 claims description 151
- 230000001070 adhesive effect Effects 0.000 claims description 150
- 230000002093 peripheral effect Effects 0.000 claims description 67
- 239000003522 acrylic cement Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 32
- 229910052742 iron Inorganic materials 0.000 description 16
- 238000000576 coating method Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
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- 238000000034 method Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 6
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- 229920001187 thermosetting polymer Polymers 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
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- 150000002484 inorganic compounds Chemical class 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000004080 punching Methods 0.000 description 3
- 238000009774 resonance method Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
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- 238000002788 crimping Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/09—Magnetic cores comprising laminations characterised by being fastened by caulking
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- the present invention relates to a laminated core and a rotating electric machine.
- the present application claims priority based on Japanese Patent Application No. 2018-235861 filed in Japan on December 17, 2018, the contents of which are incorporated herein by reference.
- Patent Document 1 Conventionally, a laminated core as described in Patent Document 1 below has been known.
- this laminated core electromagnetic steel sheets that are adjacent to each other in the laminating direction are adhered by an adhesive layer.
- the conventional laminated core has room for improvement in improving magnetic properties.
- the present invention has been made in view of the above-mentioned circumstances, and an object thereof is to improve magnetic characteristics.
- a first aspect of the present invention is a laminated core including a plurality of electromagnetic steel sheets laminated in a thickness direction, the electromagnetic steel sheet including an annular core back portion, and an outer periphery of the core back portion.
- An adhesive region is formed on the side, a non-adhesive region is formed on the inner peripheral side of the core back portion, and a plurality of caulking portions are circumferentially spaced in the non-adhesive region of the core back portion.
- the adhesive shrinks when cured. Therefore, when the adhesive is provided on the electromagnetic steel sheet, a compressive stress is applied to the electromagnetic steel sheet as the adhesive hardens. When the compressive stress is applied, the electrical steel sheet is distorted. Moreover, when the caulking portion is provided on the electromagnetic steel sheet, the electromagnetic steel sheet is deformed, so that the electromagnetic steel sheet is distorted. The caulking portion and the bonding area form a fixing portion.
- the fixing portion fixes the electromagnetic steel plates adjacent to each other in the stacking direction. As the area of the fixed part increases, the distortion of the electromagnetic steel plate increases. According to this configuration, the adhesive region in which the adhesive portion, which is an adhesive, is provided is formed only on the outer peripheral side of the core back portion.
- the core back portions of the electromagnetic steel plates that are adjacent to each other in the stacking direction are partially bonded. Therefore, for example, the area of the adhesive region formed in the core back portion is reduced as compared with the case where the adhesive region extends radially inward to the crimped portion. For this reason, the area of the fixing portion in plan view when viewed in the stacking direction is reduced. Thereby, the strain generated in the entire laminated core can be reduced. As a result, iron loss generated in the laminated core can be reduced, and the magnetic characteristics of the laminated core can be improved.
- the outer peripheral side of the core back portion is outside the outer peripheral edge of the caulking portion, and the inner peripheral side of the core back portion is the outer peripheral edge of the caulking portion. May be inside.
- the innermost portion of the adhesive area does not overlap the caulking portion at all. For this reason, it is possible to prevent further strain from being applied by providing and fixing an adhesive portion in a region where the electromagnetic steel sheet is distorted by fixing the laminating direction at the crimping portion. Therefore, the area of the fixed portion becomes smaller. Thereby, the strain generated in the laminated core can be further reduced.
- the outer circumference side of the core back portion is an outer side of an imaginary circle formed on the outer circumference side of the outer peripheral edge of the crimp portion, and the inner circumference of the core back portion.
- the side may be inside the virtual circle.
- the adhesive region may be formed at least in the vicinity of the crimped portion in the outer peripheral edge of the core back portion.
- the adhesive portion is not provided continuously over the entire circumference of the outer edge of the core back portion, but is provided discontinuously (intermittently) at intervals. Therefore, the area of the adhesive region formed in the core back portion is reduced as compared with, for example, the case where the adhesive region is formed over the entire circumference. As a result, the area of the fixed portion becomes smaller. Therefore, the strain generated in the entire laminated core can be further reduced.
- the laminated core is provided between the electromagnetic steel sheets adjacent to each other in the laminating direction and in the bonding area of the core back portion.
- An adhesive portion for adhering the core back portions adjacent to each other may be provided. According to this configuration, it is possible to reliably bond the electromagnetic steel plates that are adjacent to each other in the stacking direction using the bonding section.
- the average thickness of the adhesive portion may be 1.0 ⁇ m to 3.0 ⁇ m.
- the average tensile elastic modulus E of the adhesive portion may be 1500 MPa to 4500 MPa.
- the adhesive part may be a room temperature adhesive type acrylic adhesive containing SGA made of an elastomer-containing acrylic adhesive. ..
- a second aspect of the present invention is a rotary electric machine including the laminated core according to any one of (1) to (8). With this configuration, the magnetic characteristics of the rotating electric machine can be improved.
- magnetic characteristics can be improved.
- FIG. 6 is a diagram showing relative values of iron loss of the laminated cores of Example 1 and Example 2 when the iron loss of the laminated core of Comparative Example is 1.
- an electric motor specifically, an AC electric motor will be described as an example of the rotating electric machine.
- the AC motor is more specifically a synchronous motor, and even more specifically a permanent magnet field type motor. This type of electric motor is preferably used in, for example, an electric vehicle.
- the rotary electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotary shaft 60.
- the stator 20 and the rotor 30 are housed in the case 50.
- the stator 20 is fixed to the case 50.
- an inner rotor type rotating electric machine in which the rotor 30 is located inside the stator 20 is used as the rotating electric machine 10.
- an outer rotor type rotary electric machine in which the rotor 30 is located outside the stator 20 may be used.
- the rotary electric machine 10 is a 12-pole 18-slot three-phase AC motor.
- the number of poles, the number of slots, the number of phases, and the like can be appropriately changed.
- the stator 20 includes a stator core 21 and a winding (not shown).
- the stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23.
- the core back portion 22 is a region surrounded by an outer peripheral edge 22a of the core back portion and an inner peripheral edge 22b of the core back portion (broken line shown in FIG. 2).
- the axial direction of the stator core 21 (core back portion 22) (direction of the central axis O of the stator core 21) is referred to as the axial direction.
- the radial direction of the stator core 21 (core back portion 22) (the direction orthogonal to the central axis O of the stator core 21) is referred to as the radial direction.
- the circumferential direction of the stator core 21 (core back portion 22) (the direction of rotation around the central axis O of the stator core 21) is referred to as the circumferential direction.
- the core back portion 22 is formed in an annular shape in a plan view when the stator 20 is viewed in the axial direction.
- the plurality of teeth portions 23 project from the core back portion 22 in the radial direction (toward the central axis O of the core back portion 22 along the radial direction).
- the plurality of tooth portions 23 are arranged at equal intervals in the circumferential direction.
- 18 teeth portions 23 are provided at a central angle of 20 degrees about the central axis O.
- the plurality of teeth portions 23 have the same shape and the same size.
- the winding is wound around the tooth portion 23.
- the winding may be concentrated winding or distributed winding.
- the rotor 30 is arranged radially inward of the stator 20 (stator core 21).
- the rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32.
- the rotor core 31 is formed in an annular shape (annular shape) arranged coaxially with the stator 20.
- the rotating shaft 60 is arranged in the rotor core 31.
- the rotating shaft 60 is fixed to the rotor core 31.
- the plurality of permanent magnets 32 are fixed to the rotor core 31. In the present embodiment, two pairs of permanent magnets 32 form one magnetic pole.
- the plurality of sets of permanent magnets 32 are arranged at equal intervals in the circumferential direction. In the present embodiment, 12 sets (24 in total) of permanent magnets 32 are provided at a central angle of 30 degrees about the central axis O.
- an embedded magnet type motor is adopted as the permanent magnet field type electric motor.
- the rotor core 31 is formed with a plurality of through holes 33 that penetrate the rotor core 31 in the axial direction.
- the plurality of through holes 33 are provided corresponding to the plurality of permanent magnets 32.
- Each permanent magnet 32 is fixed to the rotor core 31 while being arranged in the corresponding through hole 33.
- each permanent magnet 32 is fixed to the rotor core 31 by bonding the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive agent or the like.
- a surface magnet type motor may be used instead of the embedded magnet type motor.
- the stator core 21 and the rotor core 31 are both laminated cores.
- the laminated core is formed by laminating a plurality of electromagnetic steel plates 40.
- the laminated thickness of each of the stator core 21 and the rotor core 31 is, for example, 50.0 mm.
- the outer diameter of the stator core 21 is, for example, 250.0 mm.
- the inner diameter of the stator core 21 is, for example, 165.0 mm.
- the outer diameter of the rotor core 31 is, for example, 163.0 mm.
- the inner diameter of the rotor core 31 is, for example, 30.0 mm.
- the product thickness, outer diameter, and inner diameter of the stator core 21, and the product thickness, outer diameter, and inner diameter of the rotor core 31 are not limited to these values.
- the inner diameter of the stator core 21 is based on the tip of the tooth portion 23 of the stator core 21.
- the inner diameter of the stator core 21 is the diameter of an imaginary circle inscribed in the tips of all the teeth 23.
- Each electromagnetic steel plate 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching an electromagnetic steel plate serving as a base material.
- a known electromagnetic steel plate can be used as the electromagnetic steel plate 40.
- the chemical composition of the electromagnetic steel sheet 40 is not particularly limited.
- a non-oriented electrical steel sheet is used as the electrical steel sheet 40.
- a non-oriented electrical steel sheet for example, a non-oriented electrical steel strip of JIS (Japanese Industrial Standard) C 2552:2014 can be adopted.
- JIS Japanese Industrial Standard
- As the grain-oriented electrical steel sheet a grain-oriented electrical steel strip of JIS C 2553:2012 can be adopted.
- Insulating coatings are provided on both surfaces of the electromagnetic steel plate 40 in order to improve workability of the electromagnetic steel plate and iron loss of the laminated core.
- the substance forming the insulating coating for example, (1) an inorganic compound, (2) an organic resin, (3) a mixture of an inorganic compound and an organic resin, or the like can be applied.
- the inorganic compound include (1) a composite of dichromate and boric acid, and (2) a composite of phosphate and silica.
- the organic resin include epoxy resin, acrylic resin, acrylic styrene resin, polyester resin, silicon resin, and fluorine resin.
- the thickness of the insulating coating is preferably 0.1 ⁇ m or more.
- the insulating effect becomes saturated as the insulating coating becomes thicker.
- the space factor decreases and the performance as a laminated core decreases. Therefore, the insulating coating is preferably thin as long as the insulating performance can be secured.
- the thickness of the insulating coating is preferably 0.1 ⁇ m or more and 5 ⁇ m or less, more preferably 0.1 ⁇ m or more and 2 ⁇ m or less.
- the thickness of the magnetic steel sheet 40 is preferably 0.10 mm or more.
- the thickness of the electromagnetic steel plate 40 is preferably 0.65 mm or less.
- the thickness of the electromagnetic steel plate 40 is preferably 0.35 mm or less.
- the thickness of the electromagnetic steel plate 40 is more preferably 0.20 mm or 0.25 mm. In consideration of the above points, the thickness of each electromagnetic steel plate 40 is, for example, 0.10 mm or more and 0.65 mm or less. The thickness of each electromagnetic steel plate 40 is preferably 0.10 mm or more and 0.35 mm or less, more preferably 0.20 mm or 0.25 mm. Note that the thickness of the electromagnetic steel plate 40 also includes the thickness of the insulating coating.
- the plurality of electromagnetic steel plates 40 forming the stator core 21 are stacked in the thickness direction.
- the thickness direction is the thickness direction of the electromagnetic steel plate 40.
- the thickness direction corresponds to the laminating direction of the electromagnetic steel plates 40.
- the plurality of electromagnetic steel plates 40 are arranged coaxially with respect to the central axis O.
- the electromagnetic steel plate 40 includes a core back portion 22 and a plurality of teeth portions 23.
- the plurality of electromagnetic steel plates 40 forming the stator core 21 are fixed to each other by an adhesive portion 41 and a caulking portion 25 provided on the surface (first surface) 40 a of the electromagnetic steel plate 40.
- the crimp portion 25 is formed by a convex portion (dough) and a concave portion formed on the electromagnetic steel plate 40.
- the convex portion projects from the electromagnetic steel plate 40 in the stacking direction.
- the concave portion is arranged at a portion of the electromagnetic steel plate 40 located on the back side of the convex portion.
- the recess is recessed in the stacking direction with respect to the surface of the electromagnetic steel plate 40.
- the convex portion and the concave portion are formed, for example, by pressing the electromagnetic steel plate 40.
- the convex portion of the caulking portion 25 of one electromagnetic steel plate 40 fits into the concave portion of the caulking portion 25 of the other electromagnetic steel plate 40.
- the bonding portion 41 bonds the core back portions 22 (magnetic steel plates 40) adjacent to each other in the stacking direction.
- the plurality of electromagnetic steel plates 40 forming the stator core 21 are bonded by the bonding portion 41.
- the adhesive part 41 is an adhesive that is provided between the electromagnetic steel plates 40 adjacent to each other in the stacking direction and is hardened without being divided.
- a thermosetting type adhesive by polymerization bonding is used as the adhesive.
- the adhesive composition (1) acrylic resin, (2) epoxy resin, (3) composition containing acrylic resin and epoxy resin, and the like can be applied.
- a room temperature curing type (room temperature adhesive type) adhesive is desirable.
- the room temperature curable adhesive is an adhesive that cures at 20°C to 30°C.
- the numerical range represented by “to” means a range including the numerical values before and after “to” as the lower limit value and the upper limit value.
- an acrylic adhesive is preferable.
- Typical acrylic adhesives include SGA (Second Generation Acrylic Adhesive, Second Generation Acrylic Adhesive). Any anaerobic adhesive, instant adhesive, or elastomer-containing acrylic adhesive can be used as long as the effects of the present invention are not impaired.
- the adhesive here means a state before curing. When the adhesive cures, it becomes the adhesive portion 41.
- the average tensile elastic modulus E of the adhesive portion 41 at room temperature (20° C. to 30° C.) is in the range of 1500 MPa to 4500 MPa. If the average tensile elastic modulus E of the adhesive portion 41 is less than 1500 MPa, the rigidity of the laminated core is reduced. Therefore, the lower limit of the average tensile elastic modulus E of the adhesive portion 41 is set to 1500 MPa, more preferably 1800 MPa. On the contrary, if the average tensile elastic modulus E of the adhesive portion 41 exceeds 4500 MPa, the insulating coating formed on the surface of the electromagnetic steel plate 40 may be peeled off. Therefore, the upper limit value of the average tensile elastic modulus E of the adhesive portion 41 is set to 4500 MPa, more preferably 3650 MPa.
- the average tensile elastic modulus E is measured by the resonance method.
- the tensile elastic modulus is measured according to JIS R 1602:1995. More specifically, first, a sample for measurement (not shown) is manufactured. This sample is obtained by bonding the two electromagnetic steel plates 40 together with an adhesive to be measured and curing it to form the bonding portion 41.
- the adhesive is a thermosetting type
- this curing is performed by heating and pressing under the heating and pressing conditions in actual operation.
- the adhesive is a room temperature curing type, it is performed by applying pressure at room temperature. Then, the tensile elastic modulus of this sample is measured by the resonance method.
- the method of measuring the tensile elastic modulus by the resonance method is performed in accordance with JIS R 1602:1995, as described above. Then, the tensile elastic modulus of the bonded portion 41 alone is obtained by calculating the influence of the electromagnetic steel plate 40 itself from the tensile elastic modulus (measured value) of the sample.
- the tensile elastic modulus obtained from the sample in this way becomes equal to the average value of the entire stator core 21, which is a laminated core. Therefore, this numerical value is regarded as the average tensile elastic modulus E.
- the composition of the average tensile elastic modulus E is set so that the average tensile elastic modulus E hardly changes at the stacking position along the stacking direction or the circumferential position around the central axis of the stator core 21. Therefore, the average tensile elastic modulus E can be set to a value obtained by measuring the cured adhesive portion 41 at the upper end position of the stator core 21.
- thermosetting adhesive for example, a method of applying the adhesive to the electromagnetic steel plate 40 and then bonding by heating or pressure bonding or both can be adopted.
- the heating means for example, a method of heating in a high temperature tank or an electric furnace, a method of directly energizing, or the like is used.
- the heating means may be any means.
- the thickness of the adhesive portion 41 is preferably 1 ⁇ m or more.
- the thickness of the adhesive portion 41 exceeds 100 ⁇ m, the adhesive force is saturated. Further, as the adhesive portion 41 becomes thicker, the space factor decreases, and the magnetic characteristics such as iron loss of the laminated core deteriorate. Therefore, the thickness of the adhesive portion 41 is 1 ⁇ m or more and 100 ⁇ m or less.
- the thickness of the adhesive portion 41 is more preferably 1 ⁇ m or more and 10 ⁇ m or less. In the above, the thickness of the adhesive portion 41 means the average thickness of the adhesive portion 41.
- the average thickness of the adhesive portion 41 is more preferably 1.0 ⁇ m or more and 3.0 ⁇ m or less. If the average thickness of the adhesive portion 41 is less than 1.0 ⁇ m, sufficient adhesive force cannot be secured as described above. Therefore, the lower limit of the average thickness of the adhesive portion 41 is 1.0 ⁇ m, and more preferably 1.2 ⁇ m. On the contrary, if the average thickness of the adhesive portion 41 exceeds 3.0 ⁇ m and becomes thicker, a problem such as a large increase in the amount of distortion of the electrical steel sheet 40 due to shrinkage during thermosetting occurs. Therefore, the upper limit of the average thickness of the adhesive portion 41 is 3.0 ⁇ m, and more preferably 2.6 ⁇ m.
- the average thickness of the adhesive portion 41 is an average value of the entire stator core 21.
- the average thickness of the adhesive portion 41 hardly changes at the stacking position along the stacking direction or the circumferential position around the central axis of the stator core 21. Therefore, the average thickness of the adhesive portion 41 can be set to the average value of the numerical values measured at 10 or more positions in the circumferential direction at the upper end position of the stator core 21.
- the average thickness of the adhesive portion 41 can be adjusted, for example, by changing the amount of adhesive applied. Further, the average tensile elastic modulus E of the adhesive portion 41, for example, in the case of a thermosetting adhesive, can be adjusted by changing one or both of the heating and pressurizing conditions and the type of curing agent applied at the time of adhesion. You can
- the plurality of electromagnetic steel plates 40 forming the rotor core 31 are fixed to each other by caulking 42 (dowels; see FIG. 1).
- the plurality of electromagnetic steel plates 40 forming the rotor core 31 may be bonded to each other by the bonding portion 41.
- the laminated cores such as the stator core 21 and the rotor core 31 may be formed by so-called rolling.
- the core back part 22 of the electromagnetic steel plate 40 is provided with a plurality of caulking parts 25 at intervals in the circumferential direction.
- each of the plurality of caulking portions 25 is provided on the non-bonding area 43.
- the plurality of caulking portions 25 are arranged on the same circle centered on the central axis O.
- the crimp portions 25 are displaced from the teeth portion 23 along the circumferential direction.
- the adhesive area 42 of the electromagnetic steel sheet 40 provided with the adhesive portion 41 and the electromagnetic area not provided with the adhesive portion 41 are provided on the surface 40a of the electromagnetic steel sheet 40 facing the stacking direction (hereinafter referred to as the first surface of the electromagnetic steel sheet 40) 40a.
- the non-bonded area 43 of the steel plate 40 is formed. More specifically, the adhesive area 42 of the electromagnetic steel plate 40 on which the adhesive portion 41 is provided is the adhesive (adhesive portion 41) that is hardened without being divided in the first surface 40a of the electromagnetic steel sheet 40. It means the area that is covered. In addition, the non-bonding region 43 of the electromagnetic steel plate 40 where the bonding portion 41 is not provided means a region of the first surface 40 a of the electromagnetic steel plate 40 where the adhesive that is hardened without being divided is not provided. ..
- the adhesive area 42 and the non-adhesive area 43 are areas different from each other and do not overlap each other.
- the bonding area 42 is formed on the outer peripheral side of the core back portion 22 of the first surface 40 a of the electromagnetic steel plate 40.
- the adhesive portion 41 is provided on the outer peripheral side of the core back portion 22 on the first surface 40a of the electromagnetic steel plate 40.
- the adhesive is applied to the outer peripheral side of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40.
- the outer peripheral side of the core back portion 22 is preferably outside the outer peripheral edge 25a of the crimped portion 25 (the outer peripheral edge 25a of the crimped portion 25 is located on the outermost side of the crimped portion 25 in the radial direction). Means part). Further, it is more preferable that the outer peripheral side of the core back portion 22 is outside the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25 a of the crimped portion 25.
- the virtual circle 27 may have the same diameter as a virtual circumscribed circle circumscribing the plurality of caulking portions 25. In FIG.
- the adhesive portion 41 is provided continuously over the entire circumference of the outer edge of the core back portion 22.
- the bonding region 42 is formed continuously over the entire outer edge of the core back portion 22 outside the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25 a of the crimp portion 25.
- the adhesive portion 41 is not provided on the inner surface side of the core back portion 22 of the first surface 40 a of the electromagnetic steel plate 40.
- the adhesive is not applied to the inner peripheral side of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40.
- the non-bonding region 43 is formed on the inner surface of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40.
- the non-adhesive region 43 is provided with a plurality of caulking portions 25 at intervals in the circumferential direction.
- the inner peripheral side of the core back portion 22 is preferably inside the outer peripheral edge 25 a of the caulking portion 25.
- the inner peripheral side of the core back portion 22 is inside the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25 a of the crimped portion 25.
- the portion of the core back portion 22 located inside the circumscribed circle in the radial direction is the non-adhesion region 43.
- the non-adhesion region 43 is provided over the entire region inside the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25 a of the caulking portion 25 in the core back portion 22.
- the non-adhesion region 43 is also provided in a portion corresponding to the plurality of teeth portions 23 on the first surface 40 a of the electromagnetic steel plate 40.
- the outside of the outer peripheral edge 25a of the crimp portion 25 refers to a region of the core back portion 22 outside the outer peripheral edge 25a of the crimp portion 25.
- the inside of the outer peripheral edge 25a of the crimped portion 25 refers to an area inside the outer peripheral edge 25a of the crimped portion 25 in the core back portion 22 and an area along the outer peripheral edge 25a of the crimped portion 25.
- the outside of the virtual circle 27 refers to a region of the core back portion 22 outside the virtual circle 27.
- the inside of the virtual circle 27 refers to a region inside the virtual circle 27 in the core back portion 22 and a region along the virtual circle 27.
- the adhesive portions 41 are provided as shown in FIG. 4 between all the sets of the electromagnetic steel plates 40 adjacent to each other in the stacking direction.
- the ratio of the area of the adhesive region 42 to the area 100% of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40 is, for example, 20%.
- the adhesive portion 41 is provided on the outer peripheral side of the core back portion 22 of the first surface 40 a of the electromagnetic steel plate 40 and at least in the vicinity of the crimp portion 25 on the outer edge of the core back portion 22. It may be.
- the vicinity of the crimped portion 25 referred to herein means, for example, a range of three times the length of the crimped portion 25 in the circumferential direction around the crimped portion 25 in the circumferential direction.
- the adhesive portion 41 is provided intermittently over the entire circumference. The adhesive portion 41 is provided only in the vicinity of the crimp portion 25 on the outer edge of the core back portion 22.
- the adhesive portion 41 is also displaced from the tooth portion 23 along the circumferential direction, like the crimp portion 25.
- the adhesive portion 41 is not provided on a portion of the outer edge of the core back portion 22 that is located outside the tooth portion 23 in the radial direction.
- the non-adhesion region 43 is formed at the portion of the outer edge of the core back portion 22 that is located on the outer side in the radial direction of the tooth portion 23, instead of the adhesion region 42.
- the circumferential size of the bonding area 42 is larger than the circumferential size of the caulking portion 25.
- the crimp portion 25 is arranged in the central portion of the adhesive region 42 along the circumferential direction.
- the size of the bonding area 42 in the circumferential direction is larger than the interval between the bonding areas 42 adjacent to each other in the circumferential direction.
- the adhesive portion 41 is provided as shown in FIG. 5 between all pairs of electromagnetic steel plates 40 that are adjacent to each other in the stacking direction.
- the ratio of the area of the adhesive region 42 to the area 100% of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40 is, for example, 12%.
- the non-adhesion regions 43 are formed in the plurality of teeth portions 23 included in the electromagnetic steel plate 40.
- the non-adhesive regions 43 of the core back portion 22 and the non-adhesive regions 43 of the plurality of teeth portions 23 may be provided with the plurality of caulking portions 25 at intervals in the circumferential direction.
- the adhesive shrinks when cured. Therefore, when the adhesive is provided on the electromagnetic steel sheet, a compressive stress is applied to the electromagnetic steel sheet as the adhesive hardens. When the compressive stress is applied, the electrical steel sheet is distorted. Moreover, when the caulking portion is provided on the electromagnetic steel sheet, the electromagnetic steel sheet is deformed, so that the electromagnetic steel sheet is distorted. The caulking portion and the bonding area form a fixing portion. The fixing portion fixes the electromagnetic steel plates adjacent to each other in the stacking direction. As the area of the fixed part increases, the distortion of the electromagnetic steel plate increases. In the stator core 21 (laminated core) according to this embodiment described above, the core back portion 22 is provided with the plurality of crimp portions 25 at intervals in the circumferential direction.
- An adhesive portion 41 is provided on the outer peripheral side of the core back portion 22 on the first surface 40 a of the electromagnetic steel plate 40.
- the adhesive portion 41 is not provided on the inner peripheral side of the core back portion 22 on the first surface 40 a of the electromagnetic steel sheet 40.
- the core back portion 22 is provided with the plurality of crimp portions 25 at intervals in the circumferential direction.
- An adhesive area 42 is formed on the outer peripheral side of the core back portion 22 on the first surface 40 a of the electromagnetic steel sheet 40.
- a non-bonding region 43 is formed on the inner surface of the core back portion 22 of the first surface 40 a of the electromagnetic steel plate 40.
- the adhesive region 42 where the adhesive portion 41 is provided is formed only on the outer peripheral side of the core back portion 22.
- the core back portions 22 of the electromagnetic steel plates 40 adjacent to each other in the stacking direction are partially bonded. Therefore, for example, the area of the adhesive region formed in the core back portion 22 is reduced as compared with the case where the adhesive region extends radially inward to the crimped portion. For this reason, the area of the fixing portion in plan view when viewed in the stacking direction is reduced. As a result, the strain generated in the entire stator core 21 can be reduced. As a result, the iron loss generated in the stator core 21 can be reduced, and the magnetic characteristics of the stator core 21 can be improved.
- the crimp portion 25 is provided in the non-adhesion region 43 different from the adhesion region 42. If an attempt is made to manufacture a stator core having a caulked portion in the bonding area, the following problems will occur. For example, an adhesive is applied to the convex portion of the caulking portion of the electromagnetic steel plate in order to provide the caulking portion in the adhesion region. If you try to fit the convex part coated with adhesive to the concave part of the caulking part of another electromagnetic steel plate, the adhesive will not fit in the concave part because the adhesive enters between the convex part and the concave part There is a risk.
- the adhesive area 42 is formed on the outer peripheral side of the core back portion 22. Therefore, in addition to applying the adhesive to the first surface 40a of the electromagnetic steel plate 40 to provide the adhesive portion 41, the adhesive portion can be provided by the following method. That is, the adhesive is arranged on the outer side in the radial direction of the plurality of laminated electromagnetic steel plates 40. When the pressure of the air inside the plurality of magnetic steel plates 40 in the radial direction is lowered, the adhesive is impregnated between the plurality of magnetic steel plates 40. The adhesive can be hardened to provide an adhesive portion.
- the outer peripheral side of the caulking portion 25 in the core back portion 22 is outside the outer peripheral edge 25a of the caulking portion 25.
- the inner peripheral side of the crimp portion 25 in the core back portion 22 is defined as the inner side of the outer peripheral edge 25a of the crimp portion 25.
- the outer peripheral side of the core back portion 22 is the outer side of the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25a of the crimp portion 25.
- the inner peripheral side of the core back portion 22 is defined as the inner side of the virtual circle 27 formed on the outer peripheral side of the outer peripheral edge 25a of the crimped portion 25.
- the adhesive region 42 is not provided on the tooth portion 23. Therefore, the area of the fixing portion, which includes the caulking portion 25 and the bonding portion 41 (bonding region 42), for fixing the electromagnetic steel plates 40 adjacent to each other in the stacking direction is smaller. As a result, the strain generated in the entire stator core 21 can be further reduced.
- the adhesive portion 41 is provided at least in the vicinity of the crimp portion 25 on the outer edge of the core back portion 22.
- the adhesive portions 41 are discontinuously (intermittently) provided at intervals without being provided continuously over the entire circumference of the outer edge of the core back portion 22. Therefore, the area of the adhesive region 42 formed in the core back portion 22 is reduced as compared with, for example, the case where the adhesive region is formed over the entire circumference of the core back portion. As a result, the area of the fixed portion becomes smaller. Therefore, the strain generated in the entire stator core 21 can be further reduced.
- the stator core 21 (laminated core) according to the present embodiment includes the adhesive portion 41 provided in the adhesive region 42 of the core back portion 22. Therefore, it is possible to reliably bond the electromagnetic steel plates 40 adjacent to each other in the stacking direction by using the bonding portion 41.
- the electromagnetic steel plate 40 includes the plurality of teeth portions 23 in which the non-bonded regions 43 are formed. As a result, the area of the non-bonded region 43 of the electromagnetic steel plate 40 increases. Therefore, it is possible to increase the area where no distortion occurs in the stator core 21.
- the rotary electric machine 10 according to the present embodiment includes a stator core 21 (laminated core) according to the present embodiment. Therefore, the magnetic characteristics of the rotary electric machine 10 can be improved.
- the shape of the stator core is not limited to the shape shown in the above embodiment. Specifically, the outer and inner diameters of the stator core, the product thickness, the number of slots, the circumferential and radial dimension ratios of the teeth, and the radial dimension ratio of the teeth and core back are desired. It can be arbitrarily designed according to the characteristics of the rotating electric machine.
- the pair of permanent magnets 32 forms one magnetic pole, but the present invention is not limited to this.
- one permanent magnet 32 may form one magnetic pole, and three or more permanent magnets 32 may form one magnetic pole.
- a permanent magnet field type electric motor has been described as an example of the rotating electric machine, but the structure of the rotating electric machine is not limited to this as illustrated below.
- the structure of the rotary electric machine various known structures not exemplified below can be adopted.
- a permanent magnet field type electric motor has been described as an example of the synchronous electric motor.
- the rotating electric machine may be a reluctance type electric motor or an electromagnet field type electric motor (winding field type electric motor).
- the synchronous motor has been described as an example of the AC motor.
- the present invention is not limited to this.
- the rotating electric machine may be an induction motor.
- the AC motor has been described as an example of the electric motor.
- the present invention is not limited to this.
- the rotating electric machine may be a DC electric motor.
- the electric motor has been described as an example of the rotating electric machine.
- the present invention is not limited to this.
- the rotating electric machine may be a generator.
- the laminated core according to the present invention is applied to the stator core.
- the laminated core according to the present invention can also be applied to a rotor core.
- Example 1 As shown in FIG. 4, the adhesive portion 41 was provided on the outer peripheral side of the core back portion 22 of the first surface 40 a of the electromagnetic steel sheet 40. A plurality of electromagnetic steel plates 40 configured in this manner were laminated to form a laminated core. The ratio of the area of the bonding region 42 to the area 100% of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40 was set to 20%. By using the electromagnetic steel plate 40 having a plate thickness of 0.20 mm and the electromagnetic steel plate 40 having a plate thickness of 0.25 mm, two types of laminated cores having different plate thicknesses of the electromagnetic steel plate 40 were configured.
- Example 2 As shown in FIG. 5, the adhesive portion 41 was provided on the outer peripheral side of the core back portion 22 of the first surface 40 a of the electromagnetic steel plate 40 and at least near the crimp portion 25 on the outer edge of the core back portion 22. A plurality of electromagnetic steel plates 40 configured in this manner were laminated to form a laminated core. The ratio of the area of the adhesive region 42 to the area 100% of the core back portion 22 of the first surface 40a of the electromagnetic steel plate 40 was set to 12%. In other respects, two types of laminated cores having different thicknesses of the electromagnetic steel plate 40 were configured in the same manner as in Example 1.
- Example 1 and Example 2 had lower iron loss than the laminated core of the comparative example regardless of the thickness of the electromagnetic steel plate 40. Therefore, it was found that the laminated cores of Example 1 and Example 2 can reduce the loss generated in the laminated core by reducing the strain generated in the entire laminated core. Furthermore, it was found that the laminated cores of Example 1 and Example 2 could sufficiently secure the magnetic characteristics of the laminated core.
- the present invention it is possible to provide a laminated core having improved magnetic characteristics, and a rotating electric machine including the laminated core. Therefore, industrial availability is great.
- stator 10 rotating electric machine 20 stator 21 stator core (laminated core) 22 core back part 23 teeth part 25 caulking part 27 virtual circle 30 rotor 31 rotor core (laminated core) 32 permanent magnet 33 through-hole 40 electromagnetic steel plate 41 adhesive portion 42 adhesive region 43 non-adhesive region 50 case 60 rotating shaft
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Abstract
Description
本願は、2018年12月17日に、日本に出願された特願2018-235861号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明の第一の態様は、厚さ方向に積層された複数の電磁鋼板を備える積層コアであって、前記電磁鋼板は、環状のコアバック部を備え、前記コアバック部の外周側には接着領域が形成され、前記コアバック部の内周側には非接着領域が形成され、前記コアバック部の前記非接着領域には、周方向に間隔をあけて複数のカシメ部が設けられている積層コアである。
この構成によれば、コアバック部の外周側のみに、例えば接着剤である接着部が設けられる接着領域が形成されている。このため、積層方向に隣り合う電磁鋼板のコアバック部同士は部分的に接着される。従って、例えば接着領域がカシメ部まで径方向内側に向けて延びている場合に比べて、コアバック部に形成される接着領域の面積が減少する。このため、積層方向に見た平面視における固定部の面積が少なくなる。これにより、積層コア全体に生じる歪を小さくすることができる。結果的に、積層コア内に発生する鉄損を低減でき、積層コアの磁気特性を向上させることができる。
この構成によれば、接着領域のうち最も内周側の部分が、カシメ部と全く重ならない。このため、カシメ部で積層方向を固定することで電磁鋼板に歪が生じている領域に、接着部を設けて固定することで歪がさらに加わることを回避することができる。従って、固定部の面積がより少なくなる。これにより、積層コアに生じる歪をより小さくすることができる。
この構成によれば、例えば電磁鋼板がティース部を備える場合であっても、ティース部に接着領域が設けられない。従って、固定部の面積がより少なくなる。これにより、積層コアに生じる歪をより小さくすることができる。
この構成によれば、接着部が、コアバック部の外縁の全周にわたって連続に設けられることなく、間隔をあけて不連続に(間欠的に)設けられる。従って、例えば接着領域が全周にわたって形成されている場合に比べて、コアバック部に形成される接着領域の面積が減少する。これにより、固定部の面積がより少なくなる。従って、積層コア全体に生じる歪をより小さくすることができる。
この構成によれば、接着部を用いて積層方向に隣り合う電磁鋼板同士を確実に接着することができる。
この構成によれば、回転電機の磁気特性を向上させることができる。
なお、本実施形態では、回転電機として電動機、具体的には交流電動機を一例に挙げて説明する。交流電動機は、より具体的には同期電動機、より一層具体的には永久磁石界磁型電動機である。この種の電動機は、例えば、電気自動車などに好適に採用される。
本実施形態では、回転電機10として、ロータ30がステータ20の内側に位置するインナーロータ型の回転電機が用いられている。しかしながら、回転電機10として、ロータ30がステータ20の外側に位置するアウターロータ型の回転電機が用いられてもよい。また、本実施形態では、回転電機10が、12極18スロットの三相交流モータである。しかしながら、例えば、極数やスロット数、相数などは適宜変更することができる。
ステータコア21は、環状のコアバック部22と、複数のティース部23と、を備える。コアバック部22は、コアバック部の外周縁22aと、コアバック部の内周縁22b(図2に示す破線)とで囲まれた領域のことである。以下では、ステータコア21(コアバック部22)の軸方向(ステータコア21の中心軸線O方向)を、軸方向という。ステータコア21(コアバック部22)の径方向(ステータコア21の中心軸線Oに直交する方向)を、径方向という。ステータコア21(コアバック部22)の周方向(ステータコア21の中心軸線O周りに周回する方向)を、周方向という。
複数のティース部23は、コアバック部22から径方向に向けて(径方向に沿ってコアバック部22の中心軸線Oに向けて)突出する。複数のティース部23は、周方向に同等の間隔をあけて配置されている。本実施形態では、中心軸線Oを中心とする中心角20度おきに18個のティース部23が設けられている。複数のティース部23は、互いに同等の形状で、かつ同等の大きさに形成されている。
前記巻線は、ティース部23に巻き回されている。前記巻線は、集中巻きされていてもよく、分布巻きされていてもよい。
ロータコア31は、ステータ20と同軸に配置される環状(円環状)に形成されている。ロータコア31内には、前記回転軸60が配置されている。回転軸60は、ロータコア31に固定されている。
複数の永久磁石32は、ロータコア31に固定されている。本実施形態では、2つ1組の永久磁石32が1つの磁極を形成している。複数組の永久磁石32は、周方向に同等の間隔をあけて配置されている。本実施形態では、中心軸線Oを中心とする中心角30度おきに、12組(全体では24個)の永久磁石32が設けられている。
ロータコア31には、ロータコア31を軸方向に貫通する複数の貫通孔33が形成されている。複数の貫通孔33は、複数の永久磁石32に対応して設けられている。各永久磁石32は、対応する貫通孔33内に配置された状態でロータコア31に固定されている。例えば、永久磁石32の外面と貫通孔33の内面とを接着剤により接着すること等により、各永久磁石32がロータコア31に固定されている。なお、永久磁石界磁型電動機として、埋込磁石型モータに代えて表面磁石型モータが用いられてもよい。
なお、ステータコア21およびロータコア31それぞれの積厚は、例えば、50.0mmとされる。ステータコア21の外径は、例えば、250.0mmとされる。ステータコア21の内径は、例えば、165.0mmとされる。ロータコア31の外径は、例えば、163.0mmとされる。ロータコア31の内径は、例えば、30.0mmとされる。ただし、これらの値は一例であり、ステータコア21の積厚、外径や内径、およびロータコア31の積厚、外径や内径は、これらの値に限られない。ここで、ステータコア21の内径は、ステータコア21におけるティース部23の先端部を基準としている。ステータコア21の内径は、全てのティース部23の先端部に内接する仮想円の直径である。
しかしながら、電磁鋼板40として、無方向性電磁鋼板に代えて方向性電磁鋼板を採用することも可能である。方向性電磁鋼板には、JIS C 2553:2012の方向性電鋼帯を採用することができる。
一方で絶縁被膜が厚くなるに連れて絶縁効果が飽和する。また、絶縁被膜が厚くなるに連れて占積率が低下し、積層コアとしての性能が低下する。したがって、絶縁被膜は、絶縁性能が確保できる範囲で薄い方がよい。絶縁被膜の厚さ(電磁鋼板40片面あたりの厚さ)は、好ましくは0.1μm以上5μm以下、より好ましくは0.1μm以上2μm以下である。
一方で電磁鋼板40が厚すぎると、電磁鋼板40のプレス打ち抜き作業が困難になる。
そのため、電磁鋼板40のプレス打ち抜き作業を考慮すると、電磁鋼板40の厚さは0.65mm以下とすることが好ましい。
また、電磁鋼板40が厚くなると鉄損が増大する。そのため、電磁鋼板40の鉄損特性を考慮すると、電磁鋼板40の厚さは0.35mm以下とすることが好ましい。電磁鋼板40の厚さは、より好ましくは、0.20mmまたは0.25mmである。
上記の点を考慮し、各電磁鋼板40の厚さは、例えば、0.10mm以上0.65mm以下である。各電磁鋼板40の厚さは、好ましくは、0.10mm以上0.35mm以下、より好ましくは0.20mmや0.25mmである。なお、電磁鋼板40の厚さには、絶縁被膜の厚さも含まれる。
図4に示すように、ステータコア21を形成する複数の電磁鋼板40同士は、電磁鋼板40の表面(第1面)40aに設けられた接着部41およびカシメ部25によって固定されている。
例えば、カシメ部25は、図示はしないが、電磁鋼板40に形成された凸部(ダボ)および凹部により構成される。凸部は、電磁鋼板40から積層方向に突出している。凹部は、電磁鋼板40において凸部の裏側に位置する部分に配置されている。凹部は、電磁鋼板40の表面に対して積層方向に窪んでいる。凸部および凹部は、例えば電磁鋼板40をプレス加工することにより形成される。
積層方向に重なる一対の電磁鋼板40のうち、一方の電磁鋼板40のカシメ部25の凸部が、他方の電磁鋼板40のカシメ部25の凹部に嵌め合う。
接着部41は、積層方向に隣り合う電磁鋼板40同士の間に設けられ、分断されることなく硬化した接着剤である。接着剤には、例えば、重合結合による熱硬化型の接着剤などが用いられる。
接着剤の組成物としては、(1)アクリル系樹脂、(2)エポキシ系樹脂、(3)アクリル系樹脂およびエポキシ系樹脂を含んだ組成物などが適用可能である。
常温硬化型の接着剤としては、アクリル系接着剤が好ましい。代表的なアクリル系接着剤には、SGA(第二世代アクリル系接着剤。Second Generation Acrylic Adhesive)などがある。本発明の効果を損なわない範囲で、嫌気性接着剤、瞬間接着剤、エラストマー含有アクリル系接着剤がいずれも使用可能である。
なお、ここで言う接着剤は硬化前の状態を言う。接着剤は硬化すると、接着部41となる。
より具体的には、まず、測定用のサンプル(不図示)を製作する。このサンプルは、2枚の電磁鋼板40間を、測定対象の接着剤により接着し、硬化させて接着部41を形成することにより、得られる。この硬化は、接着剤が熱硬化型の場合には、実操業上の加熱加圧条件で加熱加圧することで行う。一方、接着剤が常温硬化型の場合には常温下で加圧することで行う。
そして、このサンプルについての引張弾性率を、共振法で測定する。共振法による引張弾性率の測定方法は、上述した通り、JIS R 1602:1995に準拠して行う。その後、サンプルの引張弾性率(測定値)から、電磁鋼板40自体の影響分を計算により除くことで、接着部41単体の引張弾性率が求められる。
このようにしてサンプルから求められた引張弾性率は、積層コアであるステータコア21全体としての平均値に等しくなる。このため、この数値をもって平均引張弾性率Eとみなす。平均引張弾性率Eは、その積層方向に沿った積層位置やステータコア21の中心軸線回りの周方向位置で殆ど変わらないよう、組成が設定されている。そのため、平均引張弾性率Eは、ステータコア21の上端位置にある、硬化後の接着部41を測定した数値をもってその値とすることもできる。
なお、加熱手段には、例えば、高温槽や電気炉内での加熱、または直接通電する方法等が用いられる。加熱手段は、どのような手段でも良い。
したがって、接着部41の厚さは1μm以上100μm以下である。接着部41の厚さは、さらに好ましくは1μm以上10μm以下である。
なお、上記において接着部41の厚さは、接着部41の平均厚みを意味する。
接着部41の平均厚みは、ステータコア21全体としての平均値である。接着部41の平均厚みは、その積層方向に沿った積層位置やステータコア21の中心軸線回りの周方向位置で殆ど変わらない。そのため、接着部41の平均厚みは、ステータコア21の上端位置において、円周方向10箇所以上で測定した数値の平均値をもってその値とすることができる。
しかしながら、ロータコア31を形成する複数の電磁鋼板40が、接着部41によって互いに接着されていてもよい。
なお、ステータコア21やロータコア31などの積層コアは、いわゆる回し積みにより形成されていてもよい。
電磁鋼板40において積層方向を向く面(以下、電磁鋼板40の第1面という)40aには、接着部41が設けられた電磁鋼板40の接着領域42と、接着部41が設けられていない電磁鋼板40の非接着領域43とが形成されている。より具体的には、接着部41が設けられた電磁鋼板40の接着領域42とは、電磁鋼板40の第1面40aのうち、分断されることなく硬化した接着剤(接着部41)が設けられている領域を意味する。また、接着部41が設けられていない電磁鋼板40の非接着領域43とは、電磁鋼板40の第1面40aのうち、分断されることなく硬化した接着剤が設けられていない領域を意味する。
接着領域42と非接着領域43とは、互いに異なる領域であり、互いに重ならない。
また、コアバック部22の外周側は、カシメ部25の外周縁25aの外周側に形成される仮想円27の外側であることがより好ましい。前記仮想円27は、複数のカシメ部25に外接する仮想の外接円と同径とすることができる。
図4では、カシメ部25の外周縁25aの外周側に形成される仮想円27の外側において、コアバック部22の外縁の全周にわたって連続して、接着部41が設けられている。
言い換えると、図4では、カシメ部25の外周縁25aの外周側に形成される仮想円27の外側において、コアバック部22の外縁の全周にわたって連続して、接着領域42が形成される。
コアバック部22の内周側は、カシメ部25の外周縁25aの内側であることが好ましい。また、コアバック部22の内周側は、カシメ部25の外周縁25aの外周側に形成される仮想円27の内側であることがより好ましい。言い換えると、コアバック部22において前記外接円の径方向の内側に位置する部分は、非接着領域43であることが好ましい。図4では、コアバック部22における、カシメ部25の外周縁25aの外周側に形成される仮想円27の内側の領域の全域にわたって、非接着領域43が設けられている。
なお、電磁鋼板40の第1面40aにおける複数のティース部23に対応する部分にも、非接着領域43が設けられている。
図5に示す例では、接着部41が、全周にわたって間欠的に設けられている。接着部41は、コアバック部22の外縁におけるカシメ部25の近傍に限定して設けられている。言い換えると、接着部41も、カシメ部25と同様に、周方向に沿ってティース部23とは位置がずらされている。コアバック部22の外縁のうち、ティース部23の径方向の外側に位置する部分には、接着部41が設けられていない。言い換えると、コアバック部22の外縁のうち、ティース部23の径方向の外側に位置する部分には接着領域42ではなく、非接着領域43が形成されている。
接着領域42の周方向の大きさは、カシメ部25の周方向の大きさよりも大きい。カシメ部25は、周方向に沿って、接着領域42の中央部に配置されている。接着領域42の周方向の大きさは、周方向に隣り合う接着領域42同士の間隔よりも大きい。
以上説明した本実施形態に係るステータコア21(積層コア)では、コアバック部22に、周方向に間隔をあけて複数のカシメ部25が設けられている。電磁鋼板40の第1面40aのコアバック部22の外周側に、接着部41が設けられている。電磁鋼板40の第1面40aのコアバック部22の内周側に、接着部41が設けられていない。
言い換えると、本実施形態に係るステータコア21(積層コア)では、コアバック部22に、周方向に間隔をあけて複数のカシメ部25が設けられている。電磁鋼板40の第1面40aのコアバック部22の外周側には、接着領域42が形成されている。電磁鋼板40の第1面40aのコアバック部22の内周側には、非接着領域43が形成されている。
仮に、接着領域にカシメ部が設けられたステータコアを製造しようとすると、以下の問題が生じる。例えば、接着領域にカシメ部を設けるために、電磁鋼板のカシメ部の凸部に接着剤を塗布する。接着剤を塗布した凸部を、他の電磁鋼板のカシメ部の凹部に嵌め合わせようとすると、凸部と凹部との間に接着剤が入り込むことで、凹部の奥まで凸部が嵌め合わない虞がある。この場合、凸部と凹部とが精度良く嵌合せず、一対の電磁鋼板が互いに平行に積層されないという問題がある。
電磁鋼板のカシメ部の凹部に接着剤を塗布する場合にも、同様の問題が生じる。
これに対して、本実施形態のステータコア21では、非接着領域43にカシメ部25が設けられている。このため、凸部と凹部との間に接着剤が入り込むことがなく、電磁鋼板40にカシメ部25を設けても、積層方向に隣り合う電磁鋼板40を平行に積層することができる。
すなわち、複数積層した電磁鋼板40の径方向外側に、接着剤を配置する。複数の電磁鋼板40の径方向内側の空気の圧力を下げると、複数の電磁鋼板40の間に接着剤が含浸する。この接着剤を硬化させて、接着部を設けることができる。
このように構成することにより、接着領域42のうち、最も内周側の部分が、カシメ部25と全く重ならない。このため、カシメ部25で積層方向を固定することで電磁鋼板40に歪が生じている領域に、接着部41を設けて固定することで歪がさらに加わることを回避することができる。従って、固定部の面積がより少なくなる。これにより、ステータコア21全体に生じる歪をより小さくすることができる。
このように構成することにより、ティース部23に接着領域42が設けられない。従って、積層方向に隣り合う電磁鋼板40同士を固定する、カシメ部25と接着部41(接着領域42)からなる固定部の面積がより少なくなる。これにより、ステータコア21全体に生じる歪をより小さくすることができる。
これにより、接着部41が、コアバック部22の外縁の全周にわたって連続に設けられることなく、間隔をあけて不連続(間欠的に)に設けられる。従って、例えば接着領域がコアバック部の全周にわたって形成されている場合に比べて、コアバック部22に形成される接着領域42の面積が減少する。これにより、固定部の面積がより少なくなる。従って、ステータコア21全体に生じる歪をより小さくすることができる。
本実施形態に係るステータコア21(積層コア)において、電磁鋼板40が、非接着領域43が形成されている複数のティース部23を備える。これにより、電磁鋼板40における非接着領域43の面積が増加する。従って、ステータコア21における歪が生じない領域を増加させることができる。
前記実施形態では、同期電動機として、永久磁石界磁型電動機を一例に挙げて説明した。しかし、本発明はこれに限られない。例えば、回転電機がリラクタンス型電動機や電磁石界磁型電動機(巻線界磁型電動機)であってもよい。
前記実施形態では、交流電動機として、同期電動機を一例に挙げて説明した。しかし、本発明はこれに限られない。例えば、回転電機が誘導電動機であってもよい。
前記実施形態では、電動機として、交流電動機を一例に挙げて説明した。しかし、本発明はこれに限られない。例えば、回転電機が直流電動機であってもよい。
前記実施形態では、回転電機として、電動機を一例に挙げて説明した。しかし、本発明はこれに限られない。例えば、回転電機が発電機であってもよい。
図4に示すように、電磁鋼板40の第1面40aのコアバック部22の外周側に接着部41を設けた。このように構成した複数の電磁鋼板40を積層し、積層コアを構成した。
電磁鋼板40の第1面40aのコアバック部22の面積100%に対する接着領域42の面積の割合を、20%とした。
板厚0.20mmの電磁鋼板40と板厚0.25mmの電磁鋼板40を用いて、電磁鋼板40の板厚が異なる2種類の積層コアを構成した。
図5に示すように、電磁鋼板40の第1面40aのコアバック部22の外周側、かつ、コアバック部22の外縁のうち、少なくともカシメ部25の近傍に、接着部41を設けた。このように構成した複数の電磁鋼板40を積層し、積層コアを構成した。
電磁鋼板40の第1面40aのコアバック部22の面積100%に対する接着領域42の面積の割合を、12%とした。
その他の点は、実施例1と同様にして、電磁鋼板40の板厚が異なる2種類の積層コアを構成した。
図6に示すように、電磁鋼板40の第1面40aのコアバック部22と外周縁22aとの境界22cから、電磁鋼板40の第1面40aのコアバック部22の内周側にわたって、接着部41を設けた。このように構成した複数の電磁鋼板40を積層し、積層コアを構成した。
電磁鋼板40の第1面40aのコアバック部22の面積100%に対する接着領域42の面積の割合を、80%とした。
その他の点は、実施例1と同様にして、電磁鋼板40の板厚が異なる2種類の積層コアを作製した。
実施例1、実施例2および比較例で作製した積層コアについて、巻線の各相に実効値10A、周波数100Hzの励磁電流を印加した。そして、ロータの回転数を1000rpmに設定した条件で、鉄損を評価した。
鉄損の評価は、ソフトウェアを用いたシミュレーションにより実施した。ソフトウェアとしては、JSOL株式会社製の有限要素法電磁場解析ソフトJMAGを利用した。
比較例の積層コアの鉄損を1として、実施例1および実施例2の積層コアの鉄損の相対値を図7に示す。
図7の結果から、電磁鋼板40の板厚によらず、実施例1および実施例2の積層コアは、比較例の積層コアよりも鉄損が低いことが分かった。
従って、実施例1および実施例2の積層コアは、積層コア全体に生じる歪を小さくすることで、積層コア内に発生する損失を低減できることが分かった。さらに、実施例1および実施例2の積層コアは、積層コアの磁気特性を十分に確保できることが分かった。
20 ステータ
21 ステータコア(積層コア)
22 コアバック部
23 ティース部
25 カシメ部
27 仮想円
30 ロータ
31 ロータコア(積層コア)
32 永久磁石
33 貫通孔
40 電磁鋼板
41 接着部
42 接着領域
43 非接着領域
50 ケース
60 回転軸
Claims (9)
- 厚さ方向に積層された複数の電磁鋼板を備える積層コアであって、
前記電磁鋼板は、環状のコアバック部を備え、
前記コアバック部の外周側には接着領域が形成され、
前記コアバック部の内周側には非接着領域が形成され、
前記コアバック部の前記非接着領域には、周方向に間隔をあけて複数のカシメ部が設けられている、積層コア。 - 前記コアバック部の外周側は、前記カシメ部の外周縁の外側であり、
前記コアバック部の内周側は、前記カシメ部の外周縁の内側である、請求項1に記載の積層コア。 - 前記コアバック部の外周側は、前記カシメ部の外周縁の外周側に形成される仮想円の外側であり、
前記コアバック部の内周側は、前記仮想円の内側である、請求項2に記載の積層コア。 - 前記接着領域は、前記コアバック部の外周縁のうち、少なくとも前記カシメ部近傍に形成される、請求項1~3のいずれか1項に記載の積層コア。
- 積層方向に隣り合う前記電磁鋼板同士の間であって、前記コアバック部の前記接着領域に設けられ、積層方向に隣り合う前記コアバック部同士を接着する接着部を備える、請求項1~4のいずれか1項に記載の積層コア。
- 前記接着部の平均厚みが1.0μm~3.0μmである請求項5に記載の積層コア。
- 前記接着部の平均引張弾性率Eが1500MPa~4500MPaである請求項5または6に記載の積層コア。
- 前記接着部が、エラストマー含有アクリル系接着剤からなるSGAを含む常温接着タイプのアクリル系接着剤である請求項5~7のいずれか1項に記載の積層コア。
- 請求項1~8のいずれか1項に記載の積層コアを備える、回転電機。
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- 2019-12-17 EP EP19899146.5A patent/EP3902109A4/en active Pending
- 2019-12-17 TW TW108146108A patent/TWI724690B/zh active
- 2019-12-17 US US17/299,886 patent/US11979059B2/en active Active
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- 2019-12-17 CN CN201980082976.9A patent/CN113196618A/zh active Pending
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Cited By (9)
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US11710990B2 (en) | 2018-12-17 | 2023-07-25 | Nippon Steel Corporation | Laminated core with circumferentially spaced adhesion parts on teeth |
US11742129B2 (en) | 2018-12-17 | 2023-08-29 | Nippon Steel Corporation | Adhesively-laminated core, manufacturing method thereof, and electric motor |
US11855485B2 (en) | 2018-12-17 | 2023-12-26 | Nippon Steel Corporation | Laminated core, method of manufacturing same, and electric motor |
US11863017B2 (en) | 2018-12-17 | 2024-01-02 | Nippon Steel Corporation | Laminated core and electric motor |
US11915860B2 (en) | 2018-12-17 | 2024-02-27 | Nippon Steel Corporation | Laminated core and electric motor |
US11923130B2 (en) | 2018-12-17 | 2024-03-05 | Nippon Steel Corporation | Laminated core and electric motor |
US11973369B2 (en) | 2018-12-17 | 2024-04-30 | Nippon Steel Corporation | Laminated core with center electrical steel sheets adhered with adhesive and some electrical steel sheets fixed to each other on both ends of the center sheets |
US11990795B2 (en) | 2018-12-17 | 2024-05-21 | Nippon Steel Corporation | Adhesively-laminated core for stator, method of manufacturing same, and electric motor |
US11996231B2 (en) | 2018-12-17 | 2024-05-28 | Nippon Steel Corporation | Laminated core and electric motor |
Also Published As
Publication number | Publication date |
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US20220094218A1 (en) | 2022-03-24 |
CN113196618A (zh) | 2021-07-30 |
US11979059B2 (en) | 2024-05-07 |
KR102607589B1 (ko) | 2023-11-30 |
EA202192071A1 (ru) | 2021-11-08 |
JPWO2020129935A1 (ja) | 2021-11-18 |
CA3131664A1 (en) | 2020-06-25 |
KR20210091240A (ko) | 2021-07-21 |
SG11202108948YA (en) | 2021-09-29 |
TWI724690B (zh) | 2021-04-11 |
TW202030958A (zh) | 2020-08-16 |
BR112021009648A2 (pt) | 2021-08-10 |
EP3902109A1 (en) | 2021-10-27 |
EP3902109A4 (en) | 2022-10-05 |
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