WO2020129942A1 - 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
- WO2020129942A1 WO2020129942A1 PCT/JP2019/049294 JP2019049294W WO2020129942A1 WO 2020129942 A1 WO2020129942 A1 WO 2020129942A1 JP 2019049294 W JP2019049294 W JP 2019049294W WO 2020129942 A1 WO2020129942 A1 WO 2020129942A1
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- WIPO (PCT)
- Prior art keywords
- adhesive
- electromagnetic steel
- region
- laminated core
- core
- Prior art date
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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
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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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
- 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
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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
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
-
- 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
-
- 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
- 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
- H02K1/16—Stator cores with slots for windings
-
- 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
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- 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
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped 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
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
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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
- 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
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- 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
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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 laminated core and a rotating electric machine.
- the present application claims priority based on Japanese Patent Application No. 2018-235857 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 is known. In this laminated core, electromagnetic steel sheets adjacent to each other in the laminating direction are bonded.
- 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 the magnetic characteristics of a laminated core.
- One aspect of the present invention includes a plurality of electromagnetic steel sheets stacked on each other, and an adhesive portion that is provided between the electromagnetic steel sheets that are adjacent to each other in the stacking direction and that bonds the electromagnetic steel sheets to each other.
- the electromagnetic steel sheet has an annular core back portion and a plurality of teeth portions extending from the core back portion in the radial direction of the core back portion and arranged at intervals in the circumferential direction of the core back portion.
- the teeth portion of the electromagnetic steel plate is a laminated core having a bonding area provided with a band-shaped bonding portion extending along the circumferential direction.
- the tooth portion of the electromagnetic steel sheet has the bonding area in which the band-shaped bonding portion is provided. Since the strip-shaped adhesive portion extends along one direction, it is possible to increase the adhesive area of the adhesive portion and increase the adhesive strength as compared with the case where the dot-shaped adhesive portions are intermittently provided in the same range. .. In the area of the electromagnetic steel sheet that comes into contact with the bonded portion, strain due to curing shrinkage of the adhesive occurs, and the iron loss of the electromagnetic steel sheet increases in that area.
- the area of the electromagnetic steel sheet in which the iron loss increases due to the strain by contacting the adhesion area is referred to as a “deteriorated area”.
- the adhesive portion since the adhesive portion has a strip shape extending in the circumferential direction and is provided in the tooth portion, the deteriorated region extends in the circumferential direction in the tooth portion. Since the magnetic flux flowing in the teeth portion is along the radial direction, the path length of the magnetic flux passing through the deteriorated area is shortened by extending the deteriorated area in the circumferential direction. Therefore, the magnetic resistance to each magnetic flux in the magnetic circuit is reduced, and deterioration of the magnetic characteristics of the laminated core can be suppressed.
- the adhesion region may be formed closer to the core back portion than the vicinity of the tip of the tooth portion.
- the magnetic flux diffuses and extends from the tips of the teeth to both sides in the circumferential direction. Therefore, in the vicinity of the tips of the teeth, magnetic flux is likely to concentrate at both ends in the circumferential direction. If the deteriorated region is provided in the region where the magnetic flux is concentrated, the iron loss is likely to increase remarkably. Therefore, if the deteriorated region is provided near the tip of the tooth portion, iron loss tends to increase. According to the above configuration, since the adhesion region is located closer to the core back portion side than the vicinity of the tip of the tooth portion, the deteriorated region can be arranged away from the region having a high magnetic flux density, and the increase in iron loss can be suppressed.
- the adhesive region has a radial width dimension that increases from the circumferential center of the tooth portion toward the circumferential end of the tooth portion.
- the configuration may be increased.
- the magnetic flux diffuses and extends from the tips of the teeth to both sides in the circumferential direction. Also, the magnetic flux tends to flow through the shortest distance. Therefore, the magnetic flux density of the tooth portion becomes higher toward the end portion side in the circumferential direction. If the variation in the magnetic flux density of the teeth portion in the circumferential direction increases, the magnetic characteristics of the laminated core may deteriorate. According to the above-described configuration, the radial width dimension of the adhesive region increases from the central portion of the tooth portion toward the circumferential end portion side. That is, the radial length of the deteriorated region becomes longer from the central portion of the tooth portion toward the circumferential end portion side.
- the magnetic resistance of the tooth portion increases toward the outer side in the circumferential direction, and it becomes difficult for the magnetic flux to flow on the end portion side in the circumferential direction.
- the adhesive region may be configured to extend in an arc shape along the circumferential direction.
- the adhesive part can be applied uniformly along the circumferential direction, so that the manufacturing process can be simplified.
- the adhesive portion may extend over the entire width of the tooth portion.
- the adhesive portion extends over the entire width of the tooth portion, it is easy to secure the adhesive strength between the tooth portions.
- 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 portion is a room temperature adhesive type acrylic adhesive containing SGA made of an elastomer-containing acrylic adhesive. May be.
- the melting point of the adhesive portion may be 180° C. or higher.
- a rotary electric machine includes the laminated core according to any one of (1) to (9).
- the magnetic characteristics of the laminated core can be improved.
- FIG. 4 is a schematic diagram of an electromagnetic steel plate and a bonding region of the stator shown in FIGS. 2 and 3.
- FIG. 8 is a schematic diagram of a bonding area of a stator of Modification 1.
- FIG. 9 is a schematic diagram of an adhesion region of a stator of modification 2.
- FIG. 9 is a schematic diagram of an adhesion region of a stator of modification 3;
- FIG. 9 is a schematic diagram of a bonding area of a stator of Modification 4;
- FIG. 11 is a schematic diagram of a bonding area of a stator of Modification 5.
- Model No. 1 to model No. It is a graph which shows the simulation result of the iron loss of No. 4.
- an electric motor 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 of the rotating electric machine.
- 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.
- the rotating electric machine 10 an inner rotor type in which the rotor 30 is located inside the stator 20 is adopted.
- the rotating electric machine 10 may be an outer rotor type in which the rotor 30 is located outside the stator 20.
- the rotary electric machine 10 is a three-phase AC motor having 12 poles and 18 slots.
- the number of poles, the number of slots, the number of phases, etc. can be appropriately changed.
- the stator 20 includes a stator core (laminated core) 21 and windings (not shown).
- the stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23.
- 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, and is orthogonal to the radial direction of the stator core 21 (core back portion 22) (the central axis O of the stator core 21).
- the direction) is referred to as the radial direction
- the circumferential direction of the stator core 21 (core back portion 22) (the direction in which the stator core 21 rotates around the central axis O) 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 extend from the core back portion 22 inward 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 used as the permanent magnet field type electric motor.
- a plurality of through holes 33 are formed in the rotor core 31 so as to 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 of the permanent magnets 32 is fixed to the rotor core 31 while being arranged in the corresponding through hole 33.
- the fixing of each permanent magnet 32 to the rotor core 31 can be realized by, for example, bonding the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive agent.
- a surface magnet type motor may be adopted as the permanent magnet field type electric motor instead of the embedded magnet type.
- the stator core 21 is a laminated core.
- the stator core 21 is formed by stacking a plurality of electromagnetic steel plates 40. That is, the stator core 21 includes a plurality of electromagnetic steel plates 40 stacked in the stacking direction.
- the laminated thickness of the stator core 21 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 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.
- the electromagnetic steel plate 40 a known electromagnetic steel plate can be used.
- 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 according to JIS C 2552:2014 can be adopted.
- the grain-oriented electrical steel sheet for example, a grain-oriented electrical steel strip according to JIS C 2553:2012 can be adopted.
- Insulation coatings are provided on both sides of the electromagnetic steel plate 40 to improve the workability of the electromagnetic steel plate and the 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 proportion of the insulating coating in the stator core 21 increases, and the magnetic characteristics of the stator core 21 deteriorate. 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 electromagnetic 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. Further, as the electromagnetic steel plate 40 becomes thicker, iron loss increases.
- the thickness of the electromagnetic steel plate 40 is preferably 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm.
- the thickness of each electromagnetic steel plate 40 is, for example, 0.10 mm or more and 0.65 mm or less, preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm. is there.
- the thickness of the electromagnetic steel plate 40 also includes the thickness of the insulating coating.
- 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 adhesive by polymerization bonding or the like 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 radical polymerization adhesive or the like can be used as such an adhesive. From the viewpoint of productivity, it is desirable to use a room temperature curing adhesive.
- the room temperature curable adhesive cures at 20°C to 30°C.
- An acrylic adhesive is preferable as the room temperature curable adhesive.
- 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. It should be noted that the adhesive referred to here is in a state before being cured, and becomes an adhesive portion 41 after the adhesive is cured.
- 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.
- 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. Specifically, 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.
- 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.
- 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. Since the tensile modulus obtained from the sample in this way is equal to the average value of the laminated core as a whole, this value is regarded as the average tensile 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 laminating position along the laminating direction or the circumferential position around the central axis of the laminated core. Therefore, the average tensile elastic modulus E can be set to the value obtained by measuring the cured adhesive portion 41 at the upper end position of the laminated core.
- the motor heats up when it is driven. For this reason, when the melting point of the adhesive portion 41 is low, the adhesive portion 41 is melted by the heat generation of the motor and the shape of the adhesive region 42 is changed, and the desired effect cannot be obtained.
- the surface of the winding wound around the stator core 21 is provided with an insulating coating (enamel).
- the heat resistant temperature of this coating is, for example, about 180°C. Therefore, a general motor is driven at 180° C. or lower. That is, the motor can heat up to about 180°C.
- the melting point of the adhesive portion 41 is preferably 180° C. or higher. Further, the melting point of the adhesive portion 41 is more preferably 200° C. or higher in consideration of the safety factor in which there is a locally high temperature portion.
- a bonding method for example, a method of applying an adhesive to the electromagnetic steel plate 40 and then bonding by heating or pressure bonding or both can be adopted.
- the heating means may be any means such as heating in a high temperature tank or an electric furnace, or a method of directly energizing.
- 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 preferably 1 ⁇ m or more and 100 ⁇ m or less, 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 laminated core.
- 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 stacked core. 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 laminated core.
- the average thickness of the adhesive portion 41 can be adjusted, for example, by changing the amount of adhesive applied. Also, 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
- a bonded area 42 and a non-bonded area (blank area) are formed on the surface of the electromagnetic steel plate 40 facing the stacking direction (hereinafter referred to as the first surface of the electromagnetic steel plate 40).
- the adhesion region 42 is a region of the first surface of the electromagnetic steel plate 40 where the adhesion portion 41 is provided. More specifically, the adhesion region 42 is a region of the first surface of the electromagnetic steel plate 40 where the cured adhesive is provided.
- the non-bonding region is a region of the first surface of the electromagnetic steel sheet where the bonding portion 41 is not provided.
- One adhesive portion 41 is provided for each tooth portion 23.
- the adhesive part 41 is provided on each of the plurality of tooth parts 23.
- the plurality of bonding portions 41 are provided discretely along the circumferential direction as the entire electromagnetic steel plate 40. Thereby, the magnetic steel plates 40 can be fixed in a well-balanced manner.
- the adhesive portion 41 is formed in a strip shape that extends linearly along the circumferential direction. Therefore, the adhesive region 42 is also formed in a strip shape linearly extending along the circumferential direction, like the adhesive portion 41. That is, the adhesion region 42 extends in the direction orthogonal to the direction in which the teeth portion 23 extends.
- the width dimension of the bonding area 42 is uniform over the entire length of the bonding area 42.
- the adhesive area 42 is located near the tip of the tooth portion 23.
- the vicinity of the tip of the tooth portion 23 means a range from the tip of the tooth portion 23 to 1/10 of the radial length of the tooth portion 23 along the radial length of the tooth portion 23.
- the direction in which the tooth portion 23 extends (that is, the radial direction) may be referred to as the length direction of the tooth portion 23, and the direction orthogonal to the length direction may be referred to as the width direction of the tooth portion 23.
- the “strip shape” as the shape in which the adhesive portion 41 extends means a shape extending in one direction and having a width of 1.5% or more of the outer diameter of the stator core 21. .. When the width of the adhesive portion 41 is 1.5% or more of the outer diameter of the stator core 21, the adhesive strength between the electromagnetic steel plates 40 can be sufficiently secured.
- width dimension of the adhesion region 42 is uniform over the entire length of the adhesion region 42 has been described.
- the width dimension of the adhesion region 42 does not necessarily have to be uniform.
- both ends in the width direction of the adhesive region 42 may extend meandering along the length direction.
- the adhesive portion 41 has a substantially rectangular shape whose longitudinal direction is a direction orthogonal to the radial direction in a plan view. According to the present embodiment, the bonding area 41 has a shape that extends along one direction, so that the bonding area of the bonding section 41 is smaller than that in the case where the dot-shaped bonding sections 41 are intermittently provided in the same range. It can be increased to increase the adhesive strength.
- the width dimension d1 of the adhesive portion 41 is a dimension in the lateral direction of the adhesive portion 41 formed in a band shape, and is a dimension in the radial direction of the adhesive portion 41 in the present embodiment.
- the adhesive region 42 is a region where the adhesive portion 41 is provided on the first surface of the electromagnetic steel plate 40, and therefore the width dimension of the adhesive region 42 and the width dimension of the adhesive portion 41 are the same.
- the adhesive portion 41 extends over the entire width of the tooth portion 23.
- the adhesive portion 41 is formed in the shape of a band extending over the entire width of the tooth portion 23, so that the adhesive strength between the tooth portions 23 can be easily secured.
- the adhesive shrinks when cured. Therefore, in the region of the electromagnetic steel plate 40 that contacts the adhesion region 42, strain due to curing shrinkage of the adhesive occurs, and the iron loss of the electromagnetic steel plate 40 increases in the region.
- a region that comes into contact with the adhesive portion 41 and whose iron loss increases due to strain is called a deteriorated region 29.
- the deterioration region 29 is a region that overlaps with the adhesion region 42 when viewed in the stacking direction.
- the degraded region 29 has a higher magnetic resistance than other regions (non-degraded region).
- an increase in the value of the iron loss may be referred to as “deterioration of the iron loss”.
- a magnetic flux B is formed on the electromagnetic steel plate 40 by passing an electric current through the winding wire (not shown) of the stator 20.
- the magnetic flux B forms a magnetic circuit that passes through the teeth portion 23 and the core back portion 22.
- the magnetic flux B extends in the tooth portion 23 along the radial direction.
- the adhesive area 42 is formed in the tooth portion 23 in a band shape extending in the circumferential direction. Therefore, the deteriorated region 29 is formed in the tooth portion 23 in a band shape extending in the circumferential direction.
- the magnetic flux B flows in the tooth portion 23 along the radial direction. Therefore, by forming the strip-shaped adhesive region 42 extending in the circumferential direction on the tooth portion 23, the path length of the magnetic flux B passing through the deteriorated region 29 is shortened. As a result, the magnetic resistance to the magnetic flux B in the magnetic circuit is reduced, and the magnetic characteristics of the stator core 21 can be improved as compared with the case where the electromagnetic steel plates are fixed to each other by caulking.
- the rotor core 31 is a laminated core like the stator core 21. That is, the rotor core 31 includes a plurality of electromagnetic steel plates laminated in the thickness direction.
- the laminated thickness of the rotor core 31 is equal to that of the stator core 21, and is, for example, 50.0 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.
- these values are examples, and the laminated thickness, outer diameter, and inner diameter of the rotor core 31 are not limited to these values.
- the plurality of electromagnetic steel plates forming the rotor core 31 are fixed to each other by caulking C (dowel, see FIG. 1).
- the plurality of electromagnetic steel plates 40 forming the rotor core 31 may be bonded to each other by a bonding portion.
- the laminated cores such as the stator core 21 and the rotor core 31 may be formed by so-called rolling.
- the tooth portion 23 has an adhesive area 142 provided with a belt-shaped adhesive portion 141 extending along the circumferential direction.
- the adhesive part 141 of the present modification is mainly different from the above-described embodiment in that the adhesive region 142 is arranged in the vicinity of the base end of the tooth part 23.
- the adhesion region 142 is formed in a strip shape that linearly extends along the circumferential direction.
- the width dimension of the bonding area 142 is uniform over the entire length of the bonding area 142.
- a region (deteriorated region 129) in which the iron loss increases due to strain is formed in the electromagnetic steel plate 40 in contact with the adhesion region 142. According to this modification, since the path length of the magnetic flux B passing through the deteriorated region 129 becomes short, the magnetic resistance to the magnetic flux B in the magnetic circuit becomes small, and the magnetic characteristics of the stator core 21 can be improved.
- the magnetic flux B extends from the tips of the teeth portions 23 so as to diffuse to both sides in the circumferential direction. For this reason, in the vicinity of the tip of the tooth portion 23, the magnetic flux B concentrates at both end portions in the circumferential direction, and the magnetic flux density easily increases. When the deteriorated region is provided in the region where the magnetic flux density is high, the iron loss is likely to increase remarkably. Therefore, when the deteriorated region 129 is provided in the vicinity of the tip of the tooth portion 23, iron loss is likely to increase.
- the bonding area 142 of this modification is formed near the base end of the tooth portion 23. That is, the adhesion region 142 is formed on the core back portion 22 side from the vicinity of the tip of the tooth portion 23.
- the deteriorated region 129 can be arranged away from the region having a high magnetic flux density, and the increase in iron loss can be suppressed.
- the magnetic resistance to the magnetic flux B in the magnetic circuit is reduced, and the magnetic characteristics of the stator core 21 can be improved.
- the above-described effect can be obtained if the adhesive region 142 is arranged at a position closer to the base end side than 1 ⁇ 2 of the total length of the tooth part 23, and further at the base end side of 1 ⁇ 3 of the total length of the tooth part 23. If arranged, the above-mentioned effects can be more remarkably obtained.
- the tooth portion 23 has an adhesive region 242 provided with a band-shaped adhesive portion 241 extending in the circumferential direction.
- the adhesive portion 241 of the present modified example is different from the above-described embodiment mainly in that an adhesive region 242 is formed substantially at the center in the length direction of the tooth portion 23.
- the adhesion region 242 is formed in a strip shape that linearly extends in the circumferential direction, so that the path length of the magnetic flux B passing through the deterioration region 229 can be shortened. As a result, the magnetic resistance to the magnetic flux B in the magnetic circuit is reduced, and the magnetic characteristics of the stator core 21 can be improved.
- the bonding area 242 of this modification is uniform over the entire length of the bonding area 242.
- the adhesive area 242 of the present modification is located closer to the core back portion 22 side than the vicinity of the tip of the tooth portion 23, like the adhesive area 242 of the first modification, it is possible to suppress an increase in iron loss. As a result, the magnetic resistance to the magnetic flux B in the magnetic circuit is reduced, and the magnetic characteristics of the stator core 21 can be improved.
- Modification 3 Next, the adhesive portion 341 and the adhesive region 342 of Modification 3 that can be adopted in the above-described embodiment will be described based on FIG. 7.
- the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
- the tooth portion 23 has an adhesive area 342 provided with a band-shaped adhesive portion 341 extending along the circumferential direction.
- the bonding area 342 of this modification has a similar configuration to the bonding area 242 of modification 2. According to the stator core 21 having the adhesive portion 341 of the present modification, the same effect as that of the stator core 21 having the adhesive portion 241 of the modification 2 can be obtained.
- the adhesive region 342 of the present modified example is different from the adhesive region 242 of the modified example 2 in that the width dimension is not uniform over the entire length of the adhesive region 342.
- Both ends in the width direction of the adhesion region 342 of this modification have a curved shape. Both ends of the adhesive region 342 in the width direction are separated from each other from the center of the tooth portion 23 in the circumferential direction toward the end of the tooth portion 23 in the circumferential direction. Therefore, the adhesive region 342 has a radial width that increases from the circumferential center of the tooth portion 23 toward the circumferential end of the tooth portion 23. The adhesive region 342 has the smallest width dimension in the circumferential center portion of the tooth portion 23.
- the magnetic flux B extends from the tips of the teeth portions 23 so as to diffuse to both sides in the circumferential direction.
- the magnetic flux B tends to flow along the shortest distance. Therefore, the magnetic flux density of the tooth portion 23 tends to increase toward the end portion in the circumferential direction. If the variation in the magnetic flux density of the teeth portion 23 increases in the circumferential direction, the magnetic characteristics of the stator core 21 may deteriorate.
- the radial width dimension of the adhesive region 342 increases from the center of the tooth portion 23 toward the circumferential end portion side. That is, the radial length of the deteriorated region 391 increases from the central portion of the tooth portion 23 toward the end portion in the width direction. Therefore, the magnetic resistance of the tooth portion 23 increases toward the end portion in the circumferential direction, and the magnetic flux B is less likely to flow on the end portion side in the circumferential direction. As a result, it is possible to suppress the variation in the magnetic flux density in the circumferential direction of the tooth portion 23 and make the magnetic flux density in the tooth portion 23 uniform. As a result, the magnetic characteristics of the laminated core can be improved.
- the tooth portion 23 is provided with an adhesive area 442 provided with a belt-shaped adhesive portion 441 linearly extending along the circumferential direction.
- the adhesive portion 441 of the present modification is mainly that a plurality of (three) adhesive regions 442 arranged along the extending direction are formed in the tooth portion 23 as compared with the above-described embodiment. different.
- the plurality of adhesive regions 442 are arranged side by side from the center of the tooth portion 23 in the length direction to the base end side.
- a plurality of adhesive regions 441 may be provided for each tooth portion 23. Even in this case, the effects of the embodiment and the modified examples can be obtained, and in addition, the adhesive strength between the electromagnetic steel plates 40 can be increased.
- the width dimension of the adhesive area 442 is preferably smaller than the space dimension between the adjacent adhesive areas 442. Accordingly, it is possible to suppress the distortion of the electromagnetic steel sheet due to the plurality of bonding regions 442 and suppress the deterioration (increase) of the iron loss of the electromagnetic steel sheet.
- Modification 5 Next, the adhesive portion 541 and the adhesive area 542 of Modification Example 5 that can be adopted in the above-described embodiment will be described based on FIG. 9.
- the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
- the tooth portion 23 is provided with an adhesive area 542 provided with a band-shaped adhesive portion 541 extending along the circumferential direction.
- the adhesive portion 541 of the present modification is mainly different from the above-described embodiment in that the adhesive region 542 extends in an arc shape along the circumferential direction. Since the adhesive part 541 of the present modification can apply the adhesive part 541 uniformly along the circumferential direction, the manufacturing process can be simplified.
- the plurality of magnetic steel sheets are fixed to each other at the adhesive portion provided on the tooth portion.
- the electromagnetic steel plates may be fixed to each other not only at the teeth but also at the core back part.
- the core back portion may be provided with caulking, or the core back portion may be separately provided with an adhesive portion.
- the electromagnetic steel plates may be welded and fixed to each other in addition to the adhesive fixation by the adhesive portion. That is, the effects of this embodiment can be obtained regardless of the method of fixing the core back portion.
- 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.
- the permanent magnet field type electric motor has been described as an example, but the structure of the rotating electric machine is not limited to this as illustrated below, and further various publicly known examples not illustrated below. The structure of can also be adopted.
- the permanent magnet field type motor is described as an example of the synchronous motor, but the present invention is not limited to this.
- 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 is described as an example of the AC motor, but the present invention is not limited to this.
- the rotating electric machine may be an induction motor.
- the AC motor is described as an example of the electric motor, but the present invention is not limited to this.
- the rotating electric machine may be a DC electric motor.
- an electric motor has been described as an example of the rotating electric machine, but the present invention is not limited to this.
- the rotating electric machine may be a generator.
- a verification test was conducted to verify the suppression of iron loss deterioration of electrical steel sheets due to the compressive stress in the adhesive joint.
- the verification test was performed by simulation using software.
- As the software finite element method electromagnetic field analysis software JMAG manufactured by JSOL Co., Ltd. was used.
- As a model used for the simulation the model No. described below is used. 1 to model No. 4 stator cores (laminated cores) were assumed.
- the electromagnetic steel sheet used for each model was prepared by punching a thin plate having a plate thickness of 0.25 mm and a plate thickness of 0.20 mm. The shape of the electromagnetic steel sheet is the same as that shown in FIG.
- the second bonding area corresponds to the bonding area 142 shown in FIG. Model No.
- the second bonding area is formed on the plurality of teeth, and each bonding area is formed in a strip shape linearly extending in the circumferential direction near the base end of the teeth.
- the adhesive area 3 corresponds to the adhesive area 242 shown in FIG. Model No.
- the adhesive region 3 is formed on a plurality of tooth portions, and each adhesive region is formed in a strip shape extending linearly along the circumferential direction at the center of the tooth portion in the length direction.
- Model number 4 shows the stator core 1021 of No. 4 in FIG.
- the stator core 1021 is formed by stacking electromagnetic steel plates 40 having the same shape as the stator core 21 of the above-described embodiment in the thickness direction.
- the stator core 1021 is different from the stator core 21 of the above-described embodiment in that the electromagnetic steel plates 40 are fixed by caulking. That is, the electromagnetic steel plates 40 of the stator core 1021 are fixed to each other by the caulking 1042 (dowel).
- the caulking 1042 is located in the tooth portion 23.
- Fig. 10 shows the calculation results of the iron loss of electromagnetic steel sheets calculated with simulation software for each model. Further, the iron loss (vertical axis) of the calculation result shown in FIG. 4 is 1.0, the iron loss of other models is set to 1.0. It was expressed as a ratio of 4 to iron loss.
- Model number The stator core of No. 1 is model No. 1. 2 and model no. Iron loss is larger than that of the No. 3 stator core.
- magnetic characteristics can be improved. Therefore, industrial availability is great.
Abstract
Description
本願は、2018年12月17日に、日本に出願された特願2018-235857号に基づき優先権を主張し、その内容をここに援用する。
接着部に接触する電磁鋼板の領域には、接着剤の硬化収縮に起因する歪が生じ、当該領域において電磁鋼板の鉄損が上昇する。ここで、接着領域と接触して歪によって鉄損が上昇する電磁鋼板の領域を「劣化領域」と呼ぶ。上述の構成によれば、接着部は周方向に延びる帯形状であって、ティース部に設けられているため、劣化領域が、ティース部において周方向に延びる。ティース部に流れる磁束は、径方向に沿うため、劣化領域が周方向に延びることで、劣化領域を通過する磁束の経路長が短くなる。したがって、磁気回路における各磁束への磁気抵抗が小さくなり、積層コアの磁気特性の劣化を抑制することができる。
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(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)を軸方向といい、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)を径方向といい、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から径方向の内側に(径方向に沿ってコアバック部22の中心軸線Oに向けて)延びる。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。
図3に示すように、ステータコア21は、積層コアである。ステータコア21は、複数の電磁鋼板40が積層されることで形成されている。すなわち、ステータコア21は、積層方向に積層された複数の電磁鋼板40を備える。
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。方向性電磁鋼板としては、例えば、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ステータコア21における絶縁被膜の占める割合が増加し、ステータコア21の磁気特性が低下する。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、さらに好ましくは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く、より好ましくは、0.20mm又は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、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。
なお、平均引張弾性率Eは、共振法により測定される。具体的には、JIS R 1602:1995に準拠して引張弾性率を測定する。
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、積層コア全体としての平均値に等しくなるので、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積層コア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、積層コアの上端位置にある、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。
一方で接着部41の厚さが100μmを超えると接着力が飽和する。また、接着部41が厚くなるに連れて占積率が低下し、積層コアの鉄損などの磁気特性が低下する。したがって、接着部41の厚さは1μm以上100μm以下、さらに好ましくは1μm以上10μm以下とすることが好ましい。
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、積層コア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積層コア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、積層コア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。
図4に示すように、積層方向に隣り合う電磁鋼板40同士は、互いに全面接着されていない。これらの電磁鋼板40同士は、互いに局所的に接着されている。接着部41は、電磁鋼板の複数のティース部23に設けられている。ティース部23は接着部41によって接着されている。すなわち、複数の電磁鋼板40は、接着部41によって互いに接着されている。
なお、本明細書において、ティース部23が延びる方向(すなわち径方向)をティース部23の長さ方向と呼び、長さ方向と直交する方向をティース部23の幅方向と呼ぶ場合がある。
また、本明細書において、接着部41が延びる形状としての「帯形状」とは、一方向に延びる形状であって、幅がステータコア21の外径の1.5%以上であることを意味する。接着部41の幅がステータコア21の外径の1.5%以上であることで、電磁鋼板40同士の接着強度を十分に確保することができる。
なお、接着部41の幅寸法d1とは、帯状に形成された接着部41の短手方向の寸法であって、本実施形態において、接着部41の径方向における寸法である。本実施形態において、接着領域42とは、電磁鋼板40の第1面において接着部41が設けられた領域であるため、接着領域42の幅寸法と、接着部41の幅寸法は同一である。
なお、本明細書において、鉄損の値が上昇することを「鉄損の劣化」と呼ぶ場合がある。
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。
次に、上述の実施形態に採用可能な、変形例1の接着部141および接着領域142について図5を基に説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
次に、上述の実施形態に採用可能な、変形例2の接着部241および接着領域242について図6を基に説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
なお、本変形例の接着領域242は、接着領域242の全長に亘って一様である。
次に、上述の実施形態に採用可能な、変形例3の接着部341および接着領域342について、図7を基に説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
次に、上述の実施形態に採用可能な変形例4の接着部441および接着領域442について、図8を基に説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
次に、上述の実施形態に採用可能な変形例5の接着部541および接着領域542について、図9を基に説明する。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
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が、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が、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が、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が、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。
Claims (10)
- 互いに積層された複数の電磁鋼板と、
積層方向に隣り合う前記電磁鋼板同士の間に設けられ、前記電磁鋼板同士をそれぞれ接着する接着部と、を備え、
前記電磁鋼板は、
環状のコアバック部と、
前記コアバック部から前記コアバック部の径方向に延びるとともに前記コアバック部の周方向に間隔をあけて配置された複数のティース部と、を有し、
前記電磁鋼板の前記ティース部は、周方向に沿って延びる帯形状の接着部が設けられた接着領域を有する、
積層コア。 - 前記接着領域は、前記ティース部の先端近傍より前記コアバック部側に形成されている、
請求項1に記載の積層コア。 - 前記接着領域は、前記ティース部の周方向中央部から前記ティース部の周方向端部側に向かうに従い径方向の幅寸法が大きくなる、
請求項1又は2に記載の積層コア。 - 前記接着領域は、周方向に沿って円弧状に延びる、
請求項1又は2に記載の積層コア。 - 前記接着部は、前記ティース部の全幅に亘って延びる、請求項1~4の何れか一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1~5の何れか一項に記載の積層コア。 - 前記接着部の平均引張弾性率Eが1500MPa~4500MPaである、
請求項1~6の何れか一項に記載の積層コア。 - 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1~7の何れか一項に記載の積層コア。 - 前記接着部の融点が180℃以上である、
請求項1~8の何れか一項に記載の積層コア。 - 請求項1~9の何れか一項に記載の積層コアを備える、回転電機。
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CN201980081465.5A CN113169640A (zh) | 2018-12-17 | 2019-12-17 | 层叠芯及旋转电机 |
JP2020538146A JP6863525B2 (ja) | 2018-12-17 | 2019-12-17 | 積層コアおよび回転電機 |
SG11202108887TA SG11202108887TA (en) | 2018-12-17 | 2019-12-17 | Laminated core and electric motor |
BR112021008960-8A BR112021008960A2 (pt) | 2018-12-17 | 2019-12-17 | núcleo empilhado e máquina elétrica giratória |
EP19898202.7A EP3902120A4 (en) | 2018-12-17 | 2019-12-17 | STACKED CORE AND ROTATING ELECTRIC MACHINE |
CA3131500A CA3131500A1 (en) | 2018-12-17 | 2019-12-17 | Laminated core and electric motor |
KR1020217017199A KR102605370B1 (ko) | 2018-12-17 | 2019-12-17 | 적층 코어 및 회전 전기 기기 |
EA202192075A EA202192075A1 (ru) | 2018-12-17 | 2019-12-17 | Шихтованный сердечник и электродвигатель |
US17/294,202 US20220014051A1 (en) | 2018-12-17 | 2019-12-17 | Laminated core and electric motor |
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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 |
WO2023190460A1 (ja) * | 2022-03-29 | 2023-10-05 | 日本製鉄株式会社 | ステータコア、ステータの製造方法および回転電機 |
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 |
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CN114301194A (zh) * | 2021-02-26 | 2022-04-08 | 华为数字能源技术有限公司 | 定子、定子的制作方法、电机和电动汽车 |
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US20220014051A1 (en) | 2022-01-13 |
EP3902120A4 (en) | 2022-10-05 |
BR112021008960A2 (pt) | 2021-08-03 |
SG11202108887TA (en) | 2021-09-29 |
EA202192075A1 (ru) | 2021-11-23 |
KR20210088642A (ko) | 2021-07-14 |
CA3131500A1 (en) | 2020-06-25 |
EP3902120A1 (en) | 2021-10-27 |
TWI734303B (zh) | 2021-07-21 |
KR102605370B1 (ko) | 2023-11-24 |
JPWO2020129942A1 (ja) | 2021-02-15 |
CN113169640A (zh) | 2021-07-23 |
JP6863525B2 (ja) | 2021-04-21 |
TW202032894A (zh) | 2020-09-01 |
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