WO2021256533A1 - 電磁鋼板用コーティング組成物、電磁鋼板、積層コア及び回転電機 - Google Patents
電磁鋼板用コーティング組成物、電磁鋼板、積層コア及び回転電機 Download PDFInfo
- Publication number
- WO2021256533A1 WO2021256533A1 PCT/JP2021/023029 JP2021023029W WO2021256533A1 WO 2021256533 A1 WO2021256533 A1 WO 2021256533A1 JP 2021023029 W JP2021023029 W JP 2021023029W WO 2021256533 A1 WO2021256533 A1 WO 2021256533A1
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- WO
- WIPO (PCT)
- Prior art keywords
- curing agent
- electromagnetic steel
- steel sheets
- steel sheet
- coating composition
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/02—Cores, Yokes, or armatures made from sheets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/206—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2603/00—Vanes, blades, propellers, rotors with blades
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
- C08L2312/04—Crosslinking with phenolic resin
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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 coating composition for an electromagnetic steel sheet, an electromagnetic steel sheet, a laminated core, and a rotary electric machine.
- a core iron core
- a laminated core in which a plurality of electromagnetic steel sheets are joined to each other and laminated is known.
- Caulking and welding are known as methods for joining electrical steel sheets to each other.
- the magnetic properties (core iron loss) of electrical steel sheets tend to deteriorate due to mechanical strain and thermal strain during processing.
- Patent Document 1 a method of bonding electromagnetic steel sheets having an insulating film having an adhesive ability on the surface to each other is known (Patent Document 1). Adhesion using the insulating film does not give mechanical strain or thermal strain, so it is superior in core iron loss as compared with caulking and welding. Epoxy resin has little volume change, is excellent in heat resistance, oil resistance, and chemical resistance, and is excellent as an adhesive for adhering electromagnetic steel sheets to each other (Patent Documents 2 and 3).
- a method of improving heat resistance there is a method of blending a phenol resin.
- a resin having excellent heat resistance is hard at room temperature and applies a large stress to the laminated core, so that the magnetic properties deteriorate.
- a resin having an appropriate hardness near room temperature is inferior in heat resistance because it becomes soft at high temperatures. For these reasons, it is difficult to achieve both excellent magnetic properties and excellent heat resistance that can maintain sufficient adhesive strength even when exposed to high temperatures during driving.
- the present invention is a coating composition for electrical steel sheets that can achieve both the magnetic properties of a laminated core and heat resistance that can maintain the adhesive strength between electromagnetic steel sheets even in a high temperature state during driving, an electromagnetic steel sheet using the same, a laminated core, and rotation.
- the purpose is to provide electrical equipment.
- the coating composition for an electromagnetic steel plate comprises a first curing agent composed of an epoxy resin, a phenol resin containing a phenol skeleton having one or both of an alkyl group and an alkoxy group, and phenol. It contains one or more second curing agents selected from resole resin and phenol novolac resin, and the content of the first curing agent is 5 parts by mass or more and 150 parts by mass or less with respect to 100 parts by mass of the epoxy resin.
- the first curing agent is one of an alkyl group having 2 or more carbon atoms and an alkoxy group having 2 or more carbon atoms.
- the coating composition for electrical steel sheets according to the above [1] or [2] may consist of a phenolic resin containing a phenolic skeleton having both.
- the total content of the first curing agent and the second curing agent is 100 parts by mass of the epoxy resin. It may be 5 parts by mass or more and 155 parts by mass or less.
- the coating composition for electrical steel sheets according to any one of the above [1] to [3] may have a curing shrinkage rate of 15% or less.
- the electromagnetic steel sheet according to one aspect of the present invention has an insulating film on the surface containing the coating composition for electrical steel sheets according to any one of the above [1] to [4].
- the rotary electric machine according to one aspect of the present invention is a rotary electric machine provided with the laminated core according to the above [6].
- a coating composition for electrical steel sheets capable of achieving both the magnetic properties of a laminated core and heat resistance capable of maintaining the adhesive strength between electrical steel sheets even in a high temperature state during driving, and electromagnetic steel using the same.
- Steel sheets, laminated cores and rotary electric machines can be provided.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a top view of the material for forming the laminated core shown in FIG. 1.
- FIG. 4 is a cross-sectional view taken along the line BB of FIG. It is an enlarged view of the part C of FIG. It is a side view of the manufacturing apparatus used for manufacturing the laminated core shown in FIG. 1.
- an electric motor as a rotary electric machine specifically an AC electric motor, more specifically a synchronous electric motor, and more specifically, a permanent magnet field type electric motor will be described as an example.
- This type of motor is suitably adopted for, 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 in the case 50.
- the rotary electric machine 10 adopts an inner rotor type in which the rotor 30 is located inside the stator 20 in the radial direction.
- an outer rotor type in which the rotor 30 is located outside the stator 20 may be adopted.
- the rotary electric machine 10 is a 12-pole 18-slot three-phase AC motor.
- the rotary electric machine 10 can rotate at a rotation speed of 1000 rpm, for example, by applying an exciting current having an effective value of 10 A and a frequency of 100 Hz to each phase.
- the stator 20 includes an adhesive laminated core for a stator (hereinafter referred to as 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 central axis O direction of the stator core 21 (or core back portion 22) is referred to as an axial direction
- the radial direction of the stator core 21 (or core back portion 22) (direction orthogonal to the central axis O) is referred to as a radial direction
- the circumferential direction (direction that orbits around the central axis O) of the stator core 21 (or core back portion 22) is referred to as a circumferential direction.
- the core back portion 22 is formed in an annular shape in a plan view of the stator 20 when viewed from the axial direction.
- the plurality of tooth portions 23 project radially inward from the inner circumference of the core back portion 22 (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 angular intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are provided at every 20 degrees of the central angle centered on the central axis O.
- the plurality of tooth portions 23 are formed to have the same shape and the same size as each other. Therefore, the plurality of tooth portions 23 have the same thickness dimension as each other.
- the winding is wound around the teeth portion 23.
- the winding may be a centralized winding or a distributed winding.
- the rotor 30 is arranged radially inside 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 ring) 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.
- a set of two permanent magnets 32 form one magnetic pole.
- the plurality of sets of permanent magnets 32 are arranged at equal angular intervals in the circumferential direction. In this embodiment, 12 sets (24 in total) of permanent magnets 32 are provided at every 30 degrees of the central angle centered on the central axis O.
- an embedded magnet type motor is adopted as a permanent magnet field type 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 arrangement of the plurality of permanent magnets 32.
- Each permanent magnet 32 is fixed to the rotor core 31 in a state of being arranged in the corresponding through hole 33.
- the fixing of each permanent magnet 32 to the rotor core 31 can be realized, for example, by adhering the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive.
- a surface magnet type motor may be adopted instead of the embedded magnet type.
- both the stator core 21 and the rotor core 31 are laminated cores.
- the stator core 21 is formed by laminating a plurality of electromagnetic steel sheets 40 in the laminating direction.
- the product thickness (total length along the central axis O) 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 end portion of the teeth portion 23 in the stator core 21. That is, the inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the tips of all the teeth portions 23.
- Each of the electrical steel sheets 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching the material 1 as shown in FIGS. 4 to 6.
- Material 1 is an electromagnetic steel sheet that is a base material of the electromagnetic steel sheet 40. Examples of the material 1 include strip-shaped steel plates and cut plates.
- the strip-shaped steel sheet that is the base material of the electromagnetic steel sheet 40 may be referred to as material 1.
- a steel sheet having a shape used for a laminated core by punching the material 1 may be referred to as an electromagnetic steel sheet 40.
- the material 1 is handled, for example, in a state of being wound around the coil 1A shown in FIG. 7.
- non-oriented electrical steel sheets are used as the material 1.
- JIS C 2552: 2014 non-oriented electrical steel sheet can be adopted.
- a grain-oriented electrical steel sheet may be used instead of the non-oriented electrical steel sheet.
- JIS C 2553: 2019 grain-oriented electrical steel sheet can be adopted.
- a non-oriented thin electromagnetic steel strip or a directional thin electromagnetic steel strip of JIS C 2558: 2015 can be adopted.
- the upper and lower limit values of the average plate thickness t0 of the material 1 are set as follows, for example, in consideration of the case where the material 1 is used as the electromagnetic steel sheet 40. As the material 1 becomes thinner, the manufacturing cost of the material 1 increases. Therefore, in consideration of the manufacturing cost, the lower limit of the average plate thickness t0 of the material 1 is 0.10 mm, preferably 0.15 mm, and more preferably 0.18 mm. On the other hand, if the material 1 is too thick, the manufacturing cost becomes good, but when the material 1 is used as the electromagnetic steel sheet 40, the eddy current loss increases and the core iron loss deteriorates.
- the upper limit of the average plate thickness t0 of the material 1 is 0.65 mm, preferably 0.35 mm, and more preferably 0.30 mm.
- 0.20 mm can be exemplified as a material that satisfies the above range of the average plate thickness t0 of the material 1.
- the average plate thickness t0 of the material 1 includes not only the thickness of the base steel plate 2 described later but also the thickness of the insulating film 3. Further, the method for measuring the average plate thickness t0 of the material 1 is, for example, the following measuring method. For example, when the material 1 is wound into the shape of the coil 1A, at least a part of the material 1 is unwound into a flat plate shape. In the material 1 unraveled into a flat plate shape, a predetermined position in the longitudinal direction of the material 1 (for example, a position 10% of the total length of the material 1 away from the longitudinal edge of the material 1) is selected. do. At this selected position, the material 1 is divided into five regions along the width direction thereof. The plate thickness of the material 1 is measured at four locations that are boundaries of these five regions. The average value of the plate thicknesses at the four locations can be set to the average plate thickness t0 of the material 1.
- a predetermined position in the longitudinal direction of the material 1 for example, a position 10% of the total length of the material
- the upper and lower limit values of the average plate thickness t0 of the material 1 can be naturally adopted as the upper and lower limit values of the average plate thickness t0 of the electrical steel sheet 40.
- the method for measuring the average plate thickness t0 of the electrical steel sheet 40 is, for example, the following measuring method.
- the thickness of the laminated core is measured at four locations (that is, every 90 degrees around the central axis O) at equal intervals in the circumferential direction.
- Each of the measured product thicknesses at the four locations is divided by the number of laminated electromagnetic steel sheets 40 to calculate the plate thickness per sheet.
- the average value of the plate thicknesses at the four locations can be set to the average plate thickness t0 of the electromagnetic steel sheet 40.
- the material 1 includes a base steel plate 2 and an insulating coating 3.
- the material 1 is formed by covering both sides of a strip-shaped base steel plate 2 with an insulating coating 3.
- most of the material 1 is formed of the base steel plate 2, and the insulating film 3 thinner than the base steel plate 2 is laminated on the surface of the base steel plate 2.
- the chemical composition of the base steel sheet 2 contains 2.5% to 4.5% Si in mass%.
- the yield strength of the material 1 can be set to, for example, 380 MPa or more and 540 MPa or less.
- the insulating film 3 When the material 1 is used as the electromagnetic steel sheet 40, the insulating film 3 exhibits insulation performance between the electromagnetic steel sheets 40 adjacent to each other in the stacking direction. Further, in the present embodiment, the insulating coating 3 has an adhesive ability and adheres the electromagnetic steel sheets 40 adjacent to each other in the laminating direction.
- the insulating coating 3 may have a single-layer structure or a multi-layer structure. More specifically, for example, the insulating coating 3 may have a single-layer structure having both insulating performance and adhesive ability, and may include a base insulating coating having excellent insulating performance and a ground insulating coating having excellent adhesive performance. It may have a multi-layer structure including.
- the "adhesive ability of the insulating coating 3" in the present embodiment means that the laminated body composed of a plurality of electromagnetic steel sheets 40 laminated with the insulating coating 3 sandwiched thereof has an adhesive strength of a predetermined value or more under a predetermined temperature condition. It means the ability that can be expressed.
- the insulating coating 3 covers both sides of the base steel plate 2 without gaps over the entire surface.
- a part of the layers of the insulating coating 3 may not cover both sides of the base steel plate 2 without gaps.
- a part of the layer of the insulating film 3 may be intermittently provided on the surface of the base steel sheet 2.
- both sides of the base steel plate 2 need to be covered with the insulating film 3 so that the entire surface is not exposed.
- the insulating coating 3 does not have a base insulating coating having excellent insulating performance and has a single-layer structure having both insulating performance and adhesive ability, the insulating coating 3 has no gap over the entire surface of the base steel plate 2. Must be formed.
- the insulating film 3 has a multi-layer structure including a base insulating film having excellent insulating performance and a ground insulating film having excellent adhesiveness, both the base insulating film and the ground insulating film are made of a base steel sheet. In addition to forming the base insulating film without gaps over the entire surface of No. 2, even if the underlying insulating film is formed without gaps over the entire surface of the base steel sheet and the upper ground insulating film is intermittently provided, both insulation performance and adhesive ability can be achieved. ..
- the coating composition constituting the underlying insulating film is not particularly limited, and for example, a general treatment agent such as a chromic acid-containing treatment agent or a phosphate-containing treatment agent can be used.
- the insulating coating 3 having an adhesive ability is coated with a coating composition for electrical steel sheets containing an epoxy resin, a first curing agent, and a second curing agent.
- the insulating film made of the coating composition for electrical steel sheets is in an uncured or semi-cured state (B stage) before heat crimping at the time of manufacturing a laminated core, and the curing reaction proceeds by heating during heat crimping to adhere. Noh develops.
- the coating composition for electrical steel sheets may be used for forming an insulating film having a single layer structure, or may be used for forming an underlying insulating film provided on an underlying insulating film.
- epoxy resin a general epoxy resin can be used, and specifically, any epoxy resin having two or more epoxy groups in one molecule can be used without particular limitation.
- epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, triphenylmethane type epoxy resin, alicyclic epoxy resin, and glycidyl ester type.
- Epoxy resin, glycidylamine type epoxy resin, hidden toin type epoxy resin, isocyanurate type epoxy resin, acrylic acid modified epoxy resin (epoxy acrylate), phosphorus-containing epoxy resin, their halides (bromination epoxy resin, etc.) and hydrogenation Things etc. can be mentioned.
- the epoxy resin one type may be used alone, or two or more types may be used in combination.
- the content of the epoxy resin is, for example, preferably 30 to 90% by mass, more preferably 40 to 80% by mass, still more preferably 50 to 70% by mass, based on the total mass of the coating composition for electrical steel sheets.
- the content of the epoxy resin is at least the above lower limit value, the adhesive strength of the electrical steel sheet 40 can be further increased.
- the content of the epoxy resin is not more than the above upper limit value, the stress strain of the electromagnetic steel sheet 40 can be further suppressed.
- the first curing agent consists of a phenolic resin containing a phenolic skeleton having either or both of an alkyl group and an alkoxy group.
- the phenolic resin of the first curing agent may contain only one of a phenol skeleton having an alkyl group, a phenol skeleton having an alkoxy group, and a phenol skeleton having an alkyl group and an alkoxy group, and two or more of these may be contained. May include.
- the phenol resin of the first curing agent may be a novolak type or a resol type. As the first curing agent, only one kind may be used alone, or two or more kinds may be used in combination.
- the alkyl group of the phenol skeleton in the first curing agent may be linear or branched.
- the lower limit of the number of carbon atoms of the alkyl group contained in the phenol skeleton is preferably 2 and more preferably 4. When the number of carbon atoms of the alkyl group is at least the above lower limit value, it is easy to suppress deterioration of the magnetic properties of the laminated core.
- the upper limit of the number of carbon atoms of the alkyl group contained in the phenol skeleton is preferably 20 and more preferably 12. When the number of carbon atoms of the alkyl group is not more than the upper limit, the curing time of the epoxy resin can be shortened.
- Examples of the phenol resin containing a phenol skeleton having an alkyl group include a structural unit represented by the following formula (a-1) (hereinafter, also referred to as a structural unit (a-1)) and the following formula (a-2). ) (Hereinafter, also referred to as a structural unit (a-2)), a phenol resin having either one or both of them can be mentioned.
- R 1 is a hydrogen atom, a methyl group, an ethyl group, a phenyl group, or a hydroxyphenyl group.
- R 2 is an alkyl group having 1 to 20 carbon atoms.
- x is an integer of 1 to 3.
- R 3 and R 4 are hydrogen atoms, methyl groups, ethyl groups, phenyl groups, or hydroxyphenyl groups.
- R 5 is an alkyl group having 1 to 20 carbon atoms.
- y is 1 or 2.
- "*" in the formula (a-1) and the formula (a-2) indicates a binding site with an adjacent structural unit, and the structural unit located at the end of the polymer chain is adjacent to the structural unit. If it is not bonded, it is bonded to a hydrogen atom.
- R 1 a hydrogen atom is preferable from the viewpoint of manufacturing cost.
- the x is preferably 1 to 3 from the viewpoint of the crosslink density.
- the R 2, preferably an alkyl group having 2 to 20 carbon atoms, more preferably an alkyl group having 2 to 12 carbon atoms.
- a group represented by -CH (R 1 )-* is provided at either or both of the ortho-position and the para-position of the phenol skeleton, and is represented by -R 2.
- a structural unit having a (alkyl group) at the meta position is preferable.
- the structural unit (a-1) contained in the phenol resin of the first curing agent may be one kind or two or more kinds.
- R 3 and R 4 hydrogen atoms are preferable from the viewpoint of manufacturing cost.
- the y is preferably 1 to 3 from the viewpoint of the crosslink density.
- the R 5, preferably an alkyl group having 2 to 20 carbon atoms, more preferably an alkyl group having 2 to 12 carbon atoms.
- a group represented by -CH (R 3 )-* and a group represented by -CH (R 4 ) -OH are selected from the ortho and para positions of the phenol skeleton.
- One or more have a group (alkyl group) represented by -R 5 are radicals structural unit having the meta position preferred.
- the structural unit (a-2) contained in the phenol resin of the first curing agent may be one kind or two or more kinds.
- the alkoxy group of the phenol skeleton in the first curing agent may be linear or branched.
- the lower limit of the number of carbon atoms of the alkoxy group contained in the phenol skeleton is preferably 2. When the number of carbon atoms of the alkoxy group is at least the above lower limit value, the curing time of the epoxy resin can be shortened.
- the upper limit of the number of carbon atoms of the alkoxy group contained in the phenol skeleton is preferably 20 and more preferably 12. When the number of carbon atoms of the alkoxy group is not more than the above upper limit value, it is easy to suppress the decrease in the adhesive strength.
- phenol resin containing a phenol skeleton having an alkoxy group examples include a phenol resin having a structural unit represented by the following formula (a-3) (hereinafter, also referred to as a structural unit (a-3)).
- R 6 and R 7 are hydrogen atoms, methyl groups, ethyl groups, phenyl groups, or hydroxyphenyl groups.
- R 8 is an alkoxy group having 1 to 20 carbon atoms.
- R 9 is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.
- z is 1 or 2.
- "*" in the formula (a-3) indicates a binding site with an adjacent structural unit, and hydrogen is not bonded to the adjacent structural unit in the structural unit located at the end of the polymer chain. Bond with an atom.
- R 6 and R 7 hydrogen atoms are preferable from the viewpoint of reactivity with the epoxy resin.
- the z is preferably 1 to 3 from the viewpoint of the crosslink density.
- the R 8, preferably an alkoxy group having 2 to 20 carbon atoms, more preferably an alkoxy group having 2 to 12 carbon atoms.
- R 9 an alkyl group having a hydrogen atom or a carbon atom number of 2 to 20 is preferable, and an alkyl group having a hydrogen atom or a carbon atom number of 2 to 12 is more preferable.
- a group represented by -CH (R 6 )-* and a group represented by -CH (R 7 ) -R 8 are selected from the ortho and para positions of the phenol skeleton.
- a structural unit having two or more and having a group represented by -R 9 (hydrogen atom or alkyl group) at the meta position is preferable.
- the structural unit (a-3) contained in the phenol resin of the first curing agent may be one kind or two or more kinds.
- phenol resin of the first curing agent a phenol resin composed of any one or more of the structural units (a-1) to (a-3) is preferable, and the structural unit (a-1) and the structural unit (a-2) are preferable.
- An alkylphenol resin composed of one or both of the above, and an alkoxyphenol resin composed of the structural unit (a-3) are preferable.
- the lower limit of the weight average molecular weight (Mw) of the phenol resin of the first curing agent is preferably 1000, more preferably 2000. When the Mw of the phenol resin is at least the above lower limit value, the pot life when applied to the steel sheet as a treatment liquid can be guaranteed.
- the upper limit of Mw of the phenol resin of the first curing agent is preferably 20000, more preferably 15000. When the Mw of the phenol resin is not more than the above upper limit value, there is little risk of gelation when it is applied to the steel sheet as a treatment liquid.
- Mw can be measured by size exclusion chromatography (SEC: Size-Exclusion Chromatography) described in JIS K7252-1: 2008 using polystyrene as a standard substance.
- the method for producing the phenolic resin as the first curing agent is not particularly limited, and a known method can be adopted.
- the alkylphenol resin composed of the structural unit (a-1) can be produced by, for example, polycondensing the alkylphenol with aldehydes in the presence of an acid catalyst (oxalic acid, hydrochloric acid, sulfonic acid, etc.).
- the alkylphenol resin containing the structural unit (a-2) can be produced, for example, by a method of polycondensing (resolving reaction) phenols with aldehydes in the presence of a base catalyst (sodium hydroxide, ammonia, amine, etc.).
- the alkylphenol is not particularly limited, and is, for example, cresol (o-cresol, etc.), ethylphenol (o-ethylphenol, etc.), propylphenol (p-propylphenol, p-isopropylphenol, etc.), butylphenol (p-butylphenol, etc.).
- p-sec-butylphenol, etc. nonylphenol (p-nonylphenol, etc.), dodecylphenol (p-dodecylphenol, etc.), dimethylphenol (2,3-dimethylphenol, etc.), diethylphenol (2,3-diethylphenol, etc.), Examples thereof include dibutylphenol (2,6-di-sec-butylphenol and the like), trimethylphenol (2,3,4-trimethylphenol and the like) and the like.
- the alkylphenol one kind may be used alone, or two or more kinds may be used in combination.
- the aldehydes are not particularly limited, and examples thereof include formaldehyde, acetaldehyde, benzaldehyde, and salicylaldehyde.
- examples thereof include formaldehyde, acetaldehyde, benzaldehyde, and salicylaldehyde.
- the aldehydes one type may be used alone, or two or more types may be used in combination.
- the alcohol used for alkoxylation is not particularly limited, and is, for example, a primary alcohol (methanol, ethanol, n-butanol, 1-nonanol, etc.) and a secondary alcohol (2-hexanol, 3-hexanol, 1-heptanol, 2). -Heptanol, 2-nonanol, etc.), tertiary alcohols (t-butyl alcohol, 2-methyl-2-butanol, etc.) and the like can be mentioned.
- a primary alcohol methanol, ethanol, n-butanol, 1-nonanol, etc.
- a secondary alcohol 2-hexanol, 3-hexanol, 1-heptanol, 2).
- -Heptanol, 2-nonanol, etc. tertiary alcohols
- t-butyl alcohol 2-methyl-2-butanol, etc.
- the content of the first curing agent in the coating composition for electrical steel sheets is 5 parts by mass or more and 150 parts by mass or less with respect to 100 parts by mass of the epoxy resin.
- the content of the first curing agent is at least the above lower limit value, a laminated core having excellent magnetic properties can be obtained.
- the content of the first curing agent is not more than the upper limit, a laminated core having excellent heat resistance can be obtained.
- the lower limit of the content of the first curing agent is preferably 10 parts by mass or more, more preferably 12 parts by mass or more.
- the upper limit of the content of the first curing agent is preferably 140 parts by mass or less, more preferably 130 parts by mass or less.
- the second curing agent is one or more selected from a phenol resol resin and a phenol novolac resin.
- the phenol resol resin and the phenol novolak resin as the second curing agent have neither an alkyl group nor an alkoxy group in the phenol skeleton.
- the phenol resol resin may be used alone, the phenol novolac resin may be used alone, or the phenol resol resin and the phenol novolac resin may be used in combination.
- the total content of the first curing agent and the second curing agent in the coating composition for electrical steel sheets is preferably 10 parts by mass or more and 155 parts by mass or less with respect to 100 parts by mass of the epoxy resin.
- the total content of the first curing agent and the second curing agent is within the above range, it is easy to achieve both magnetic properties and heat resistance.
- the total content of the first curing agent and the second curing agent is less than the lower limit, the polymerization reaction of the epoxy resin may be suppressed and the high temperature strength may be deteriorated. If the total content of the first curing agent and the second curing agent exceeds the upper limit, the hardness of the cured product may become too high and the magnetism may deteriorate.
- the lower limit of the total content of the first curing agent and the second curing agent is preferably 20 parts by mass or more, more preferably 40 parts by mass or more, and further preferably 45 parts by mass or more.
- the upper limit of the total content of the first curing agent and the second curing agent is preferably 130 parts by mass or less, more preferably 100 parts by mass or less.
- the lower limit of the content of the second curing agent is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, while keeping the total content of the first curing agent and the second curing agent within the above range. ..
- the upper limit of the content of the second curing agent is preferably 60 parts by mass or less, more preferably 40 parts by mass or less.
- the coating composition for electrical steel sheets may contain components other than the epoxy resin, the first curing agent and the second curing agent.
- examples of other components include acrylic resins, curing agents other than the first curing agent and the second curing agent, curing accelerators (curing catalysts), emulsifiers, defoaming agents, and the like.
- the coating composition for electrical steel sheets does not contain inorganic fillers such as silica, alumina, and glass.
- inorganic fillers such as silica, alumina, and glass.
- only one kind may be used, or two or more kinds may be used in combination.
- the acrylic resin is not particularly limited.
- the monomer used for the acrylic resin include unsaturated carboxylic acids such as acrylic acid and methacrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and cyclohexyl (meth).
- unsaturated carboxylic acids such as acrylic acid and methacrylic acid
- (meth) acrylates such as meta) acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and hydroxypropyl (meth) acrylate can be mentioned.
- the acrylic resin may have a structural unit derived from a monomer other than the acrylic monomer.
- examples of other monomers include ethylene, propylene, styrene and the like.
- the other monomer one type may be used alone, or two or more types may be used in combination.
- the glass transition point (Tg point) of the acrylic resin is not particularly limited, but the lower limit is preferably ⁇ 40 ° C., more preferably ⁇ 20 ° C.
- the upper limit of the Tg point of the acrylic resin is preferably 80 ° C., more preferably 50 ° C.
- the content of the acrylic resin is not particularly limited, and is, for example, 1% by mass or more and 50% by mass or less with respect to the total amount of the epoxy resin and the acrylic resin. be able to. The same applies to the content when it is contained as an acrylic-modified epoxy resin or an acrylic monomer.
- an acrylic resin when used, it may be used as an acrylic modified epoxy resin obtained by grafting an acrylic resin onto an epoxy resin.
- the coating composition for electrical steel sheets it may be contained as a monomer forming an acrylic resin.
- curing agents examples include latent epoxy resin curing agents that initiate a curing reaction by heating. Specific examples thereof include aromatic polyamines, acid anhydrides, dicyandiamides, boron trifluoride-amine complexes, and organic acid hydrazides. As other curing agents, one type may be used alone, or two or more types may be used in combination.
- the content of the other curing agent in the coating composition for electrical steel sheets is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, based on 100 parts by mass of the epoxy resin.
- an epoxy resin adhesive having excellent heat resistance has a large Young's modulus near room temperature when the adhesive strength at a high temperature is guaranteed, and stresses the steel plate to deteriorate the magnetic properties (core iron loss).
- the resin composition has an appropriate strength near room temperature, the heat resistance is lowered.
- the phenol resin having either or both of an alkyl group and an alkoxy group used as the first curing agent has low elasticity.
- the curing shrinkage of the coating composition for electrical steel sheets is preferably 15% or less, more preferably 12% or less, further preferably 10% or less, and particularly preferably 8% or less.
- the curing shrinkage rate is measured by changing the film thickness in accordance with JIS K 6941.
- the insulating film 3 can be formed, for example, by applying a coating composition for an electromagnetic steel sheet to the surface of a base steel sheet, drying it, and baking it.
- the lower limit of the reached temperature at the time of baking is preferably 120 ° C. or higher, more preferably 140 ° C. or higher.
- the upper limit of the reached temperature at the time of baking is preferably 200 ° C. or lower, more preferably 180 ° C. or lower.
- the coating composition for electrical steel sheets is sufficiently adhered to the electrical steel sheets, and peeling is suppressed.
- the ultimate temperature is not more than the above upper limit value, the curing of the epoxy resin can be suppressed, and the adhesive ability of the coating composition for electrical steel sheets can be maintained.
- the lower limit of the baking time is preferably 5 seconds or longer, more preferably 10 seconds or longer.
- the upper limit of the baking time is preferably 60 seconds or less, more preferably 30 seconds or less.
- the baking time is equal to or longer than the above lower limit, the coating composition for electrical steel sheets is sufficiently adhered to the electrical steel sheets and peeling is suppressed.
- the baking time is not more than the above upper limit, the curing of the epoxy resin can be suppressed, and the adhesive ability of the coating composition for electrical steel sheets can be maintained.
- the upper and lower limit values of the average thickness t1 of the insulating film 3 may be set as follows, for example, in consideration of the case where the material 1 is used as the electromagnetic steel sheet 40.
- the average thickness t1 of the insulating film 3 is the insulation performance and adhesive ability between the electrical steel sheets 40 laminated with each other. Adjust so that can be secured.
- the average thickness t1 (thickness per one side of the electromagnetic steel sheet 40 (material 1)) of the insulating coating 3 can be, for example, 1.5 ⁇ m or more and 8.0 ⁇ m or less. ..
- the average thickness of the underlying insulating coating can be, for example, 0.3 ⁇ m or more and 2.5 ⁇ m or less, preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less.
- the average thickness of the upper insulating film can be, for example, 1.5 ⁇ m or more and 8.0 ⁇ m or less.
- the method of measuring the average thickness t1 of the insulating coating 3 in the material 1 is the same as that of the average plate thickness t0 of the material 1, and the thicknesses of the insulating coatings 3 at a plurality of locations can be obtained and obtained as the average of those thicknesses. can.
- the upper and lower limit values of the average thickness t1 of the insulating film 3 in the material 1 can be naturally adopted as the upper and lower limit values of the average thickness t1 of the insulating film 3 in the electrical steel sheet 40.
- the method for measuring the average thickness t1 of the insulating coating 3 on the electrical steel sheet 40 is, for example, the following measuring method. For example, among a plurality of electrical steel sheets forming a laminated core, the electrical steel sheet 40 located on the outermost side in the laminated direction (the electrical steel sheet 40 whose surface is exposed in the laminated direction) is selected. On the surface of the selected electrical steel sheet 40, a predetermined position in the radial direction (for example, a position just intermediate (center) between the inner peripheral edge and the outer peripheral edge of the electrical steel sheet 40) is selected.
- the thickness of the insulating coating 3 of the electrical steel sheet 40 is measured at four locations (that is, every 90 degrees around the central axis O) at equal intervals in the circumferential direction.
- the average value of the measured thicknesses at the four locations can be taken as the average thickness t1 of the insulating coating 3.
- the reason why the average thickness t1 of the insulating coating 3 was measured on the outermost electromagnetic steel sheet 40 in the laminating direction is that the thickness of the insulating coating 3 is the laminating position along the laminating direction of the electromagnetic steel sheet 40. This is because the insulating film 3 is built so that it hardly changes.
- the electromagnetic steel sheet 40 is manufactured by punching the material 1 as described above, and the laminated core (stator core 21 and rotor core 31) is manufactured by the electromagnetic steel sheet 40.
- the description of the laminated core will be returned.
- the plurality of electrical steel sheets 40 forming the stator core 21 are laminated via the insulating coating 3.
- the electromagnetic steel sheets 40 adjacent to each other in the stacking direction are adhered over the entire surface by the insulating film 3.
- the surface of the electromagnetic steel sheet 40 facing the stacking direction (hereinafter referred to as the first surface) is the bonding region 41a over the entire surface.
- the electromagnetic steel sheets 40 adjacent to each other in the stacking direction may not be adhered over the entire surface.
- the adhesive region 41a and the non-adhesive region (not shown) may coexist on the first surface of the electrical steel sheet 40.
- the plurality of electrical steel sheets forming the rotor core 31 are fixed to each other by the caulking 42 (dowel) shown in FIG.
- the plurality of electrical steel sheets forming the rotor core 31 may also have a laminated structure fixed by the insulating coating 3 as in the stator core 21.
- the laminated core such as the stator core 21 and the rotor core 31 may be formed by so-called rotating stacking.
- the stator core 21 is manufactured, for example, by using the manufacturing apparatus 100 shown in FIG. 7.
- the manufacturing apparatus 100 the laminated core manufacturing apparatus 100 (hereinafter, simply referred to as the manufacturing apparatus 100) will be described.
- the material 1 is sent out from the coil 1A (hoop) in the direction of the arrow F, the material 1 is punched a plurality of times by the dies arranged on each stage to gradually form the shape of the electromagnetic steel sheet 40. go. Then, the punched electrical steel sheets 40 are laminated and pressurized while raising the temperature. As a result, the electromagnetic steel sheets 40 adjacent to each other in the laminating direction are adhered by the insulating coating 3 (that is, the portion of the insulating coating 3 located in the adhesive region 41a exerts an adhesive ability), and the adhesion is completed.
- the insulating coating 3 that is, the portion of the insulating coating 3 located in the adhesive region 41a exerts an adhesive ability
- the manufacturing apparatus 100 includes a plurality of stages of punching stations 110.
- the punching station 110 may have two stages or three or more stages.
- the punching station 110 of each stage includes a female die 111 arranged below the material 1 and a male die 112 arranged above the material 1.
- the manufacturing apparatus 100 further includes a stacking station 140 at a position downstream of the most downstream punching station 110.
- the laminating station 140 includes a heating device 141, an outer peripheral punching female die 142, a heat insulating member 143, an outer peripheral punching male die 144, and a spring 145.
- the heating device 141, the outer peripheral punched female die 142, and the heat insulating member 143 are arranged below the material 1.
- the outer peripheral punching die 144 and the spring 145 are arranged above the material 1.
- Reference numeral 21 indicates a stator core.
- the material 1 is sequentially sent out from the coil 1A in the direction of the arrow F in FIG. Then, the material 1 is sequentially punched by a plurality of punching stations 110. By these punching processes, the shape of the electromagnetic steel sheet 40 having the core back portion 22 and the plurality of tooth portions 23 shown in FIG. 3 is obtained on the material 1. However, since it is not completely punched at this point, the process proceeds to the next step along the arrow F direction.
- the material 1 is sent to the laminating station 140, punched out by the outer peripheral punching die 144, and laminated with high accuracy.
- the electromagnetic steel sheet 40 receives a constant pressing force by the spring 145.
- the laminated core formed by stacking the electromagnetic steel sheets 40 in this way is heated to, for example, a temperature of 200 ° C. by the heating device 141. By this heating, the insulating coatings 3 of the adjacent electromagnetic steel sheets 40 are adhered to each other (adhesion step).
- the conditions of the bonding process are not particularly limited.
- the heating temperature in the bonding step is preferably 120 to 250 ° C.
- the heating time in the bonding step is affected by the size of the laminated core and the heating method, but is preferably 30 seconds to 120 minutes, for example.
- the insulating coatings 3 when adhered to each other, they may be adhered by pressurizing the laminated body.
- the pressure and pressurization time for pressurizing the laminate are preferably, for example, 2 to 300 MPa and 30 seconds to 120 minutes.
- the heating device 141 may not be arranged on the outer peripheral punched female die 142. That is, before the electromagnetic steel sheets 40 laminated by the outer peripheral punched female die 142 are adhered, they may be taken out of the outer peripheral punched female die 142. In this case, the outer peripheral punched female die 142 may not have the heat insulating member 143. Further, in this case, the stacked electromagnetic steel sheets 40 before bonding may be sandwiched and held from both sides in the stacking direction by a jig (not shown), and then transported or heated. The stator core 21 is completed by each of the above steps.
- an insulating film is formed on the surface of the electrical steel sheet by the coating composition for electrical steel sheet in which the epoxy resin, the first curing agent and the second curing agent are combined in a specific ratio.
- the technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
- the shape of the stator core is not limited to the form shown in the above embodiment. Specifically, the dimensions of the outer diameter and inner diameter of the stator core, the product thickness, the number of slots, the dimensional ratio between the circumferential direction and the radial direction of the tooth portion, the dimensional ratio in the radial direction between the tooth portion and the core back portion, etc. are desired. It can be arbitrarily designed according to the characteristics of the rotary electric machine.
- a set of two permanent magnets 32 form one magnetic pole, but the present invention is not limited to this.
- one permanent magnet 32 may form one magnetic pole, or three or more permanent magnets 32 may form one magnetic pole.
- the permanent magnet field type electric machine has been described as an example of the rotary electric machine 10, but the structure of the rotary electric machine 10 is not limited to this as illustrated below, and is not further exemplified below. Various known structures can also be adopted.
- the permanent magnet field type motor has been described as an example of the rotary electric machine 10, but the present invention is not limited to this.
- the rotary electric machine 10 may be a reluctance type electric machine or an electromagnet field type electric machine (winding field type electric machine).
- the synchronous motor has been described as an example of the AC motor, but the present invention is not limited to this.
- the rotary electric machine 10 may be an induction motor.
- the AC electric machine has been described as an example of the rotary electric machine 10, but the present invention is not limited to this.
- the rotary electric machine 10 may be a DC motor.
- the rotary electric machine 10 has been described by taking an electric machine as an example, but the present invention is not limited to this.
- the rotary electric machine 10 may be a generator.
- H1 Phenol resol resin
- H2 Phenol novolak resin (curing agent (comparative target))
- B1 Diaminodiphenylmethane
- the coating composition for electrical steel sheets was applied to the surface of the electrical steel strips of each example, and the curing shrinkage was measured.
- the curing shrinkage rate was measured by changing the film thickness according to JIS K 6941.
- Example 1 As a base steel sheet, non-directional electromagnetic steel having a mass% of Si: 3.0%, Mn: 0.2%, Al: 0.5%, a plate thickness of 0.25 mm and a width of 100 mm, the balance of which is composed of Fe and impurities. A steel plate was used. Each component shown in Table 1 was mixed to prepare a coating composition for electrical steel sheets. The obtained coating composition for an electromagnetic steel sheet was applied to the surface of a base steel sheet and baked at 160 ° C. for 20 seconds to obtain an electromagnetic steel strip having an insulating film having an average thickness of 3 ⁇ m.
- Examples 2 to 8, Comparative Examples 1 to 8 An electromagnetic steel strip was obtained in the same manner as in Example 1 except that the composition and baking conditions of the coating composition for electrical steel sheets were changed as shown in Table 1.
- Table 1 shows the composition and baking conditions of the coating composition for electrical steel sheets of each example.
- Table 2 shows the evaluation results of the magnetic properties (magnetism) and the adhesive strength of each example.
- both the heat resistance and the magnetic characteristics of the laminated core can be achieved at the same time. Therefore, the industrial applicability is great.
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Abstract
Description
また、電気自動車の駆動モータ等では、駆動中に高温になるため、さらなる耐熱性が求められる。
[1]本発明の一態様に係る電磁鋼板用コーティング組成物は、エポキシ樹脂と、アルキル基及びアルコキシ基のいずれか一方又は両方を有するフェノール骨格を含むフェノール樹脂からなる第1硬化剤と、フェノールレゾール樹脂及びフェノールノボラック樹脂から選ばれる1種以上の第2硬化剤と、を含有し、前記第1硬化剤の含有量が、エポキシ樹脂100質量部に対して、5質量部以上150質量部以下である。
[2]上記[1]に記載の電磁鋼板用コーティング組成物は、前記第1硬化剤が、炭素原子数が2以上のアルキル基、及び炭素原子数が2以上のアルコキシ基のいずれか一方又は両方を有するフェノール骨格を含むフェノール樹脂からなってもよい。
[3]上記[1]または[2]に記載の電磁鋼板用コーティング組成物は、前記第1硬化剤と前記第2硬化剤の合計の含有量が、前記エポキシ樹脂の100質量部に対して、5質量部以上155質量部以下であってもよい。
[4]上記[1]~[3]のいずれかに記載の電磁鋼板用コーティング組成物は、硬化収縮率が15%以下であってもよい。
[5]本発明の一態様に係る電磁鋼板は、上記[1]~[4]のいずれかに記載の電磁鋼板用コーティング組成物を含む絶縁被膜を表面に有する。
[6]本発明の一態様に係る積層コアは、上記[5]に記載の電磁鋼板が複数積層され、互いに接着されている。
[7]本発明の一態様に係る回転電機は、上記[6]に記載の積層コアを備える回転電機。
図1に示すように、回転電機10は、ステータ20と、ロータ30と、ケース50と、回転軸60と、を備える。ステータ20及びロータ30は、ケース50内に収容される。
ステータ20は、ケース50内に固定される。
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の径方向内側に位置するインナーロータ型を採用している。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を採用してもよい。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、極数、スロット数、相数などは、適宜変更することができる。
回転電機10は、例えば、各相に実効値10A、周波数100Hzの励磁電流を印加することにより、回転数1000rpmで回転することができる。
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。以下では、ステータコア21(又はコアバック部22)の中心軸線O方向を軸方向と言い、ステータコア21(又はコアバック部22)の径方向(中心軸線Oに直交する方向)を径方向と言い、ステータコア21(又はコアバック部22)の周方向(中心軸線O回りに周回する方向)を周方向と言う。
複数のティース部23は、コアバック部22の内周から径方向内側に向けて(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、周方向に同等の角度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。よって、複数のティース部23は、互いに同じ厚み寸法を有している。
前記巻線は、ティース部23に巻回されている。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、周方向に同等の角度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の配置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。各永久磁石32のロータコア31への固定は、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、実現できる。なお、永久磁石界磁型電動機として、埋込磁石型に代えて表面磁石型モータを採用してもよい。
なお、ステータコア21及びロータコア31それぞれの積厚(中心軸線Oに沿った全長)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、及びロータコア31の積厚、外径や内径は、これらの値のみに限られない。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の先端部を基準とする。すなわち、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。
素材1は、例えば、図7に示すコイル1Aに巻き取られた状態で取り扱われる。本実施形態では、素材1として、無方向性電磁鋼板を採用している。無方向性電磁鋼板としては、JIS C 2552:2014の無方向性電磁鋼板を採用できる。しかしながら、素材1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してもよい。この場合の方向性電磁鋼板としては、JIS C 2553:2019の方向性電磁鋼板を採用できる。また、JIS C 2558:2015の無方向性薄電磁鋼帯や方向性薄電磁鋼帯を採用できる。
素材1が薄くなるに連れて素材1の製造コストは増す。そのため、製造コストを考慮すると、素材1の平均板厚t0の下限値は、0.10mm、好ましくは0.15mm、より好ましくは0.18mmとなる。
一方で素材1が厚すぎると、製造コストは良好になるが、素材1が電磁鋼板40として用いられた場合に、渦電流損が増加してコア鉄損が劣化する。そのため、コア鉄損と製造コストを考慮すると、素材1の平均板厚t0の上限値は、0.65mm、好ましくは0.35mm、より好ましくは0.30mmとなる。
素材1の平均板厚t0の上記範囲を満たすものとして、0.20mmを例示できる。
測定した4か所の積厚それぞれを、積層されている電磁鋼板40の枚数で割って、1枚当たりの板厚を算出する。4か所の板厚の平均値を、電磁鋼板40の平均板厚t0とすることができる。
素材1は、帯状の母材鋼板2の両面が絶縁被膜3によって被覆されてなる。本実施形態では、素材1の大部分が母材鋼板2によって形成され、母材鋼板2の表面に、母材鋼板2よりも薄い絶縁被膜3が積層されている。
Al:0.001%~3.0%
Mn:0.05%~5.0%
残部:Fe及び不純物
電磁鋼板用コーティング組成物からなる絶縁被膜は、積層コア製造時の加熱圧着前においては、未硬化状態又は半硬化状態(Bステージ)であり、加熱圧着時の加熱によって硬化反応が進行して接着能が発現する。電磁鋼板用コーティング組成物は、単層構成の絶縁被膜の形成に用いてもよく、下地絶縁被膜上に設ける上地絶縁被膜の形成に用いてもよい。
第1硬化剤としては、1種のみを単独で使用してもよく、2種以上を併用してもよい。
フェノール骨格が有するアルキル基の炭素原子数の下限は、好ましくは2であり、より好ましくは4である。アルキル基の炭素原子数が前記下限値以上であれば、積層コアの磁気特性の劣化を抑制しやすい。
フェノール骨格が有するアルキル基の炭素原子数の上限は、好ましくは20であり、より好ましくは12である。アルキル基の炭素原子数が前記上限値以下であれば、エポキシ樹脂の硬化時間を短くすることができる。
なお、式(a-1)及び式(a-2)における「*」は、隣接する構成単位との結合部位であることを示し、ポリマー鎖の末端に位置する構成単位において隣接する構成単位と結合していない場合は水素原子と結合する。
xとしては、架橋密度の点から、1~3が好ましい。
R2としては、炭素原子数2~20のアルキル基が好ましく、炭素原子数2~12のアルキル基がより好ましい。
第1硬化剤のフェノール樹脂に含まれる構成単位(a-1)は、1種であってもよく、2種以上であってもよい。
yとしては、架橋密度の点から、1~3が好ましい。
R5としては、炭素原子数2~20のアルキル基が好ましく、炭素原子数2~12のアルキル基がより好ましい。
第1硬化剤のフェノール樹脂に含まれる構成単位(a-2)は、1種であってもよく、2種以上であってもよい。
フェノール骨格が有するアルコキシ基の炭素原子数の下限は、好ましくは2である。アルコキシ基の炭素原子数が前記下限値以上であれば、エポキシ樹脂の硬化時間を短くすることができる。
フェノール骨格が有するアルコキシ基の炭素原子数の上限は、好ましくは20であり、より好ましくは12である。アルコキシ基の炭素原子数が前記上限値以下であれば、接着強度の低下を抑制しやすい。
なお、式(a-3)における「*」は、隣接する構成単位との結合部位であることを示し、ポリマー鎖の末端に位置する構成単位において隣接する構成単位と結合していない場合は水素原子と結合する。
zとしては、架橋密度の点から、1~3が好ましい。
R8としては、炭素原子数2~20のアルコキシ基が好ましく、炭素原子数2~12のアルコキシ基がより好ましい。
R9としては、水素原子又は炭素原子数2~20のアルキル基が好ましく、水素原子又は炭素原子数2~12のアルキル基がより好ましい。
第1硬化剤のフェノール樹脂に含まれる構成単位(a-3)は、1種であってもよく、2種以上であってもよい。
第1硬化剤のフェノール樹脂のMwの上限は、好ましくは20000、より好ましくは15000である。フェノール樹脂のMwが前記上限値以下であれば、鋼板に処理液として塗布する際にゲル化する危険性が少ない。
なお、Mwは、標準物質としてポリスチレンを用い、JIS K7252-1:2008に記載のサイズ排除クロマトグラフィー(SEC:Size-Exclusion Chromatography)により測定できる。
具体例としては、構成単位(a-1)からなるアルキルフェノール樹脂は、例えば、酸触媒(シュウ酸、塩酸、スルホン酸等)の存在下、アルキルフェノールをアルデヒド類で重縮合させる方法で製造できる。構成単位(a-2)を含むアルキルフェノール樹脂は、例えば、塩基触媒(水酸化ナトリウム、アンモニア、アミン等)の存在下、フェノール類をアルデヒド類で重縮合(レゾール化反応)させる方法で製造できる。構成単位(a-3)を含むアルコキシフェノール樹脂は、例えば、構成単位(a-2)を含むアルキルフェノール樹脂を得た後、構成単位(a-2)のアルカノール基(-CH(R4)-OH)をアルコキシ化する方法で製造できる。
第1硬化剤の含有量の下限は、好ましくは10質量部以上、より好ましくは12質量部以上である。第1硬化剤の含有量の上限は、好ましくは140質量部以下、より好ましくは130質量部以下である。
第2硬化剤としては、フェノールレゾール樹脂を単独で使用してもよく、フェノールノボラック樹脂を単独で使用してもよく、フェノールレゾール樹脂とフェノールノボラック樹脂を併用してもよい。
第1硬化剤と第2硬化剤の合計の含有量の下限は、好ましくは20質量部以上、より好ましくは40質量部以上、さらに好ましくは45質量部以上である。第1硬化剤と第2硬化剤の合計の含有量の上限は、好ましくは130質量部以下、より好ましくは100質量部以下である。
他の成分としては、1種のみを使用してもよく、2種以上を併用してもよい。
本実施形態では、第1硬化剤として用いる、アルキル基及びアルコキシ基のいずれか一方又は両方を有するフェノール樹脂が低弾性である。このような第1硬化剤を第2硬化剤と組み合わせてエポキシ樹脂に配合することで、絶縁被膜の弾性率が過度に上昇することが抑制される。その結果、鋼板に付与される応力が低減されるため、磁気特性に優れた積層コアが得られる。また、フェノール樹脂は優れた耐熱性を有しているため、第1硬化剤と第2硬化剤を組み合わせて用いることで、耐熱性も向上する。これらのことから、磁気特性と耐熱性を両立することができる。
なお、硬化収縮率は、JIS K 6941に準拠して膜厚の変化により測定される。
焼き付ける際の到達温度の下限値は、好ましくは120℃以上、より好ましくは140℃以上である。焼き付ける際の到達温度の上限値は、好ましくは200℃以下、より好ましくは180℃以下である。到達温度が上記下限値以上であると、電磁鋼板用コーティング組成物が電磁鋼板と充分に接着し、剥離が抑制される。到達温度が上記上限値以下であると、エポキシ樹脂の硬化を抑制でき、電磁鋼板用コーティング組成物の接着能を維持できる。
素材1が電磁鋼板40として用いられる場合において、絶縁被膜3の平均厚みt1(電磁鋼板40(素材1)片面あたりの厚さ)は、互いに積層される電磁鋼板40間での絶縁性能及び接着能を確保できるように調整する。
複層構成の絶縁被膜3の場合、下地絶縁被膜の平均厚みは、例えば、0.3μm以上2.5μm以下とすることができ、0.5μm以上1.5μm以下が好ましい。上地絶縁被膜の平均厚みは、例えば、1.5μm以上8.0μm以下とすることができる。
なお、素材1における絶縁被膜3の平均厚みt1の測定方法は、素材1の平均板厚t0と同様の考え方で、複数箇所の絶縁被膜3の厚みを求め、それらの厚みの平均として求めることができる。
以下、積層コアの説明に戻る。
ステータコア21を形成する複数の電磁鋼板40は、図3に示すように、絶縁被膜3を介して積層されている。
また、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。
前記ステータコア21は、例えば、図7に示す製造装置100を用いて製造される。以下では、製造方法の説明にあたり、まず先に、積層コアの製造装置100(以下、単に製造装置100という)について説明する。
加熱装置141、外周打ち抜き雌金型142、断熱部材143は、素材1の下方に配置されている。一方、外周打ち抜き雄金型144及びスプリング145は、素材1の上方に配置されている。なお、符号21は、ステータコアを示している。
以上の各工程により、ステータコア21が完成する。
ステータコアの形状は、前記実施形態で示した形態に限定されるものではない。具体的には、ステータコアの外径及び内径の寸法、積厚、スロット数、ティース部の周方向と径方向の寸法比率、ティース部とコアバック部との径方向の寸法比率、などは所望の回転電機の特性に応じて任意に設計可能である。
上記実施形態では、回転電機10として、永久磁石界磁型電動機を一例に挙げて説明したが、本発明はこれのみに限られない。例えば、回転電機10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。
上記実施形態では、交流電動機として、同期電動機を一例に挙げて説明したが、本発明はこれに限られない。例えば、回転電機10が誘導電動機であってもよい。
上記実施形態では、回転電機10として、交流電動機を一例に挙げて説明したが、本発明はこれに限られない。例えば、回転電機10が直流電動機であってもよい。
上記実施形態では、回転電機10として、電動機を一例に挙げて説明したが、本発明はこれに限られない。例えば、回転電機10が発電機であってもよい。
実施例で使用した原料を以下に示す。
(エポキシ樹脂)
E1:ビスフェノールA型エポキシ樹脂
E2:ビスフェノールF型エポキシ樹脂
E3:トリフェニルメタン型エポキシ樹脂
A1:アルキルフェノール樹脂(構成単位(a-1)、R1:水素原子、R2(メタ位):-(CH2)3CH3、x=1、Mw=7000)
A2:アルキルフェノール樹脂(構成単位(a-1)、R1:水素原子、R2(メタ位):-(CH2)8CH3、x=2、Mw=3000)
A3:アルコキシフェノール樹脂(構成単位(a-3)、R6:水素原子、R7:水素原子、R8(メタ位):-O-C(CH3)2-CH2CH3、z=1、R9:水素原子、Mw=14000)
H1:フェノールレゾール樹脂
H2:フェノールノボラック樹脂
(硬化剤(比較対象))
B1:ジアミノジフェニルメタン
M1:アクリル樹脂(メチルメタクリレート単位:イソブチルアクリレート単位:スチレン単位:2-エチルヘキシルアクリレート単位(モル比)=40:20:20:10、ガラス転移温度:32℃)
M2:アクリル樹脂(メチルメタクリレート単位:n-ブチルアクリレート単位(モル比)=55:45、ガラス転移温度:10℃)
各例の電磁鋼帯から55mm×55mmサイズの矩形の電磁鋼板(単板)を切り出し、鋼板温度200℃、圧力10MPa、加圧時間1時間の条件で電磁鋼板10枚を積層接着して積層コアを作製した。得られた積層コアについて、JIS C2556(2015)に準拠した単板磁気測定法により、圧延方向と圧延方向に対して直角方向の単板磁気特性を測定し、それらの値の平均値を磁気特性として求めた。なお、磁気特性(磁性)としては、鉄損として「W10/400(W/kg)」を評価した。「W10/400」は、周波数400Hz、最大磁束密度1.0Tのときの鉄損である。
各例の電磁鋼帯から、幅30mm×長さ60mmの長方形の電磁鋼板(単板)を2枚切り出した。次いで、表面に、電磁鋼板用コーティング組成物を塗布し、互いの幅30mm×長さ10mmの先端部分同士を重ね合わせ、加圧することで測定用のサンプルを作製した。加圧条件は、鋼板温度200℃、圧力10MPa、加圧時間1時間とした。
得られたサンプルに対し、雰囲気温度を25℃もしくは150℃のそれぞれ雰囲気下で、引張速度を2mm/分として引張り、剥離するまでの最大荷重(N)を測定し、この最大荷重(N)接着面積で除した数値を接着強度(MPa)とした。
各例の電磁鋼帯の表面に電磁鋼板用コーティング組成物を塗布し、硬化収縮率を測定した。硬化収縮率は、JIS K 6941に準拠して膜厚の変化により測定した。
各例について、以下の基準で判定を行った。なお、鉄損が小さいほど、電磁鋼板に付与する応力歪が抑制されていることを意味する。測定結果及び判定結果を表2に示す。表において、発明範囲外の値には下線を付した。
「Good」:25℃の接着強度が5.0MPa以上、150℃の接着強度が1.0MPa以上、かつ磁気特性が12.0W/kg未満。なお、磁気特性に関しては、11.5W/kg以下がより好ましい。
「Bad」:25℃の接着強度が5.0MPa未満、150℃の接着強度が1.0MPa未満、または、磁気特性が12.0W/kg以上。
母材鋼板として、質量%で、Si:3.0%、Mn:0.2%、Al:0.5%、残部がFe及び不純物からなる板厚0.25mm、幅100mmの無方向性電磁鋼板を用いた。
表1に示す各成分を混合して電磁鋼板用コーティング組成物を調製した。得られた電磁鋼板用コーティング組成物を母材鋼板の表面に塗布し、160℃で20秒間焼き付けることで、平均厚みが3μmの絶縁被膜を有する電磁鋼帯を得た。
電磁鋼板用コーティング組成物の組成及び焼き付け条件を表1に示すとおりに変更した以外は、実施例1と同様にして電磁鋼帯を得た。
一方、第1硬化剤を含まない比較例1及び6、第1硬化剤の含有量が本発明の範囲外の比較例2~5、第2硬化剤を含まない比較例7、8では、耐熱性と磁気特性が両立できなかった。
Claims (7)
- エポキシ樹脂と、アルキル基及びアルコキシ基のいずれか一方又は両方を有するフェノール骨格を含むフェノール樹脂からなる第1硬化剤と、フェノールレゾール樹脂及びフェノールノボラック樹脂から選ばれる1種以上の第2硬化剤と、を含有し、
前記第1硬化剤の含有量が、エポキシ樹脂100質量部に対して、5質量部以上150質量部以下である、電磁鋼板用コーティング組成物。 - 前記第1硬化剤が、炭素原子数が2以上のアルキル基、及び炭素原子数が2以上のアルコキシ基のいずれか一方又は両方を有するフェノール骨格を含むフェノール樹脂からなる、請求項1に記載の電磁鋼板用コーティング組成物。
- 前記第1硬化剤と前記第2硬化剤の合計の含有量が、前記エポキシ樹脂の100質量部に対して、10質量部以上155質量部以下である、請求項1又は2に記載の電磁鋼板用コーティング組成物。
- 硬化収縮率が15%以下である、請求項1~3のいずれか一項に記載の電磁鋼板用コーティング組成物。
- 請求項1~4のいずれか一項に記載の電磁鋼板用コーティング組成物を含む絶縁被膜を表面に有する、電磁鋼板。
- 請求項5に記載の電磁鋼板が複数積層され、互いに接着されている、積層コア。
- 請求項6に記載の積層コアを備える回転電機。
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TWI780778B (zh) | 2022-10-11 |
BR112022024481A2 (pt) | 2022-12-27 |
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