Title of the invention: Adhesive laminated core, its manufacturing method and rotary electric machine
Technical field
[0001]
　The present invention relates to an adhesive laminated core, a method for manufacturing the same, and a rotary electric machine.
　The present application claims priority based on Japanese Patent Application No. 2018-235871 filed in Japan on December 17, 2018, the contents of which are incorporated herein by reference.
Background technology
[0002]
　Conventionally, adhesive laminated cores used for motors, transformers, and the like have been known. The adhesive laminated core has a structure in which a plurality of thin electromagnetic steel sheets are laminated and integrated with an adhesive. In the adhesive laminated core, it becomes difficult to maintain flatness as the number of laminated electromagnetic steel sheets increases. In an adhesive laminated core with poor flatness, the adhesive laminated core may not stand upright, the adhesive laminated core may tilt, the accuracy of the adhesive laminated core may not be stable, and the magnetic characteristics of the adhesive laminated core may deteriorate.
[0003]
　In response to such a problem, for example, in Patent Document 1, electromagnetic steel sheets are bonded to each other with an adhesive containing an epoxy resin and a rubber component, and adhesive lamination is performed to suppress the amount of adhesive protruding from the outer peripheral portion of the electromagnetic steel sheets. The core has been proposed. In the adhesive laminated core of Patent Document 1, the accuracy of the film thickness of the adhesive portion is improved.
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Patent Application Laid-Open No. 2014-096429
Outline of the invention
Problems to be solved by the invention
[0005]
　However, the adhesive laminated core of Patent Document 1 has room for improvement in further improving the flatness and improving the space factor.
[0006]
　The present invention has been made in view of the above circumstances, and an object of the present invention is an adhesive laminated core capable of further improving flatness and a space factor, a method for manufacturing the same, and a rotary electric machine.
Means to solve problems
[0007]
　It is considered that expansion and contraction of the bonded portion can be suppressed by blending an inorganic filler in the bonded portion that adheres the electromagnetic steel sheets to each other.
　By suppressing the expansion of the adhesive portion, it is easy to improve the space factor of the adhesive laminated core. A high space factor of the adhesive laminated core means that the ratio of the electromagnetic steel sheet to the cross section of the adhesive laminated core in the laminating direction is high. This means that the magnetic force lines can be formed at a high density when the magnetic force lines are generated inside the adhesive laminated core by excitation from the winding current. That is, increasing the space factor of the adhesive laminated core means increasing the magnetic properties of the adhesive laminated core.
[0008]
　When the 50% particle size of the inorganic filler contained in the adhesive portion is small, it is considered that the adhesive laminated core is easy to stand upright, is easy to be flat, and is easy to increase the space factor.
　However, the present inventors determine the flatness of the adhesive laminated core by determining the 50% particle size (center particle size) of the inorganic filler and the average particle size of the inorganic filler (particle size of all particles of the inorganic filler). It was found that not only the arithmetic average) but also the 90% particle size of the inorganic filler and the maximum particle size of the inorganic filler. That is, the present inventors have found that it is a component having a large particle size in the population of particles of the inorganic filler that determines the flatness of the adhesive laminated core.
　This is because no matter how small the 50% particle size or the average particle size of the inorganic filler is, if "coarse particles" are present in the population of the particles of the inorganic filler, the coarse particles will be the gaps between the electromagnetic steel plates. It is thought that this is to control the gap).
[0009]
　The present inventors have conducted extensive studies in order to solve the above problems. As a result, by reducing the 50% particle size of the inorganic filler contained in the adhesive portion and the 90% particle size of the inorganic filler contained in the adhesive portion, the flatness of the adhesive laminated core can be further improved. We have found that the space factor of the adhesive laminated core can be improved, and completed the present invention.
　That is, the present invention has the following aspects.
[0010]
(1) The first aspect of the present invention is provided between a plurality of electromagnetic steel plates laminated to each other and both sides coated with an insulating coating, and the electromagnetic steel plates adjacent to each other in the laminating direction, and the electromagnetic steel plates are bonded to each other. The adhesive for forming the adhesive portion includes an organic resin and an inorganic filler, and the 50% particle size of the inorganic filler is 0.2 to 3.5 μm, and the inorganic filler is provided. An adhesive laminated core in which the 90% particle size of the filler is 10.0 μm or less and the content of the inorganic filler is 5 to 50 parts by mass with respect to 100 parts by mass of the organic resin.
(2) In the adhesive laminated core according to (1) above, the maximum particle size of the inorganic filler may be 30.0 μm or less.
(3) In the adhesive laminated core according to (1) or (2) above, the inorganic filler may contain one or more selected from metal oxides and metal hydroxides.
(4) In the adhesive laminated core according to any one of (1) to (3), the inorganic filler may contain one or more selected from aluminum hydroxide and aluminum oxide.
(5) The adhesive laminated core according to any one of (1) to (4) may be used for a stator.
[0011]
(6) The second aspect of the present invention is [repeating the operation of applying the adhesive to a part of the surface of the electromagnetic steel sheet and then stacking and crimping the adhesive on another electromagnetic steel sheet to form the adhesive portion. , The method for manufacturing an adhesive laminated core according to any one of the above (1) to (5).
[0012]
(7) A third aspect of the present invention is a rotary electric machine provided with the adhesive laminated core according to any one of the above (1) to (5).
The invention's effect
[0013]
　According to the adhesive laminated core of the present invention, the flatness can be further improved and the space factor can be improved.
A brief description of the drawing
[0014]
FIG. 1 is a cross-sectional view of a rotary electric machine provided with an adhesive laminated core according to an embodiment of the present invention.
FIG. 2 is a side view of the adhesive laminated core shown in FIG.
FIG. 3 is a cross-sectional view taken along the line AA of FIG.
FIG. 4 is a side view showing a schematic configuration of a manufacturing apparatus for an adhesive laminated core.
Mode for carrying out the invention
[0015]
　Hereinafter, the adhesive laminated core according to the embodiment of the present invention and the rotary electric machine provided with the adhesive laminated core will be described with reference to the drawings. In the present embodiment, an electric motor as a rotary electric machine, specifically an AC electric motor, more specifically a synchronous electric motor, and even more specifically, a permanent magnet field type electric motor will be described as an example. This type of electric motor is suitably adopted for, for example, an electric vehicle or the like.
[0016]
　As shown in FIG. 1, the rotary electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotary shaft 60. The stator 20 and rotor 30 are housed in a case 50.
The stator 20 is fixed to the case 50.
　In the present embodiment, as the rotary electric machine 10, an inner rotor type in which the rotor 30 is located inside the stator 20 is adopted. However, as the rotary electric machine 10, an outer rotor type in which the rotor 30 is located outside the stator 20 may be adopted. Further, in the present embodiment, the rotary electric machine 10 is a 12-pole 18-slot three-phase AC motor. However, the number of poles, the number of slots, the number of phases, etc. can be changed as appropriate.
　The rotary electric machine 10 can rotate at a rotation speed of 1000 rpm by applying an exciting current having an effective value of 10 A and a frequency of 100 Hz to each phase, for example.
[0017]
　The stator 20 includes a stator core 21 and a winding (not shown).
　The stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23. In the following, the central axis O direction of the stator core 21 (or core back portion 22) is referred to as an axial direction, and 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 of the stator core 21 (or core back portion 22) (the direction that orbits around the central axis O) is referred to as the circumferential direction.
[0018]
　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 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. 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.
　The winding is wound around the teeth portion 23. The winding may be a centralized winding or a distributed winding.
[0019]
　The rotor 30 is arranged inside the stator 20 (or the stator core 21) in the radial direction. 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. In this embodiment, a set of two 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.
[0020]
　In this embodiment, 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 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. 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 or the like. As the permanent magnet field type motor, a surface magnet type motor may be adopted instead of the embedded magnet type motor.
[0021]
　Both the stator core 21 and the rotor core 31 are adhesive laminated cores. As shown in FIG. 2, the stator 20 is formed by laminating a plurality of electromagnetic steel sheets 40.
　In the stator 20, an adhesive portion 41 for adhering these electromagnetic steel sheets 40 to each other is provided between the electromagnetic steel sheets 40 adjacent to each other in the stacking direction, and each of the electromagnetic steel sheets 40 is adhered by the adhesive portion 41. That is, in the stator 20, the plurality of electromagnetic steel sheets 40 forming the stator core 21 are laminated via the adhesive portion 41.
[0022]
　The product thickness of each of the stator core 21 and the rotor core 31 is, for example, 50.0 mm. The outer diameter of the stator core 21 is, for example, 250.0 mm. The inner diameter of the stator core 21 is, for example, 165.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values ​​are examples, and 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. Here, the inner diameter of the stator core 21 is based on the tip of the teeth portion 23 of the stator core 21. 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.
[0023]
　Each of the electromagnetic steel sheets 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching an electromagnetic steel sheet as a base material. As the electromagnetic steel sheet 40, a known electrical steel sheet can be used. The chemical composition of the electrical steel sheet 40 is not particularly limited. In this embodiment, a non-oriented electrical steel sheet is used as the electrical steel sheet 40. As the non-oriented electrical steel sheet, for example, a non-oriented electrical steel strip of JIS C2552: 2014 can be adopted.
　However, as the electromagnetic steel sheet 40, it is also possible to use a grain-oriented electrical steel sheet instead of the non-oriented electrical steel sheet. As the grain-oriented electrical steel sheet, for example, a grain-oriented electrical steel strip of JIS C2553: 2012 can be adopted.
[0024]
　Both sides of the electrical steel sheet 40 are coated with an insulating film in order to improve the workability of the electrical steel sheet and the iron loss of the adhesive laminated core. As the substance constituting the insulating film, for example, (1) an inorganic compound, (2) an organic resin, (3) a mixture of an inorganic compound and an organic resin, and the like can be applied. Examples of the inorganic compound include (1) a complex of dichromate and boric acid, (2) a complex of phosphate and silica, and (3) a phosphate. Examples of the organic resin include epoxy resin, acrylic resin, acrylic styrene resin, polyester resin, silicone resin, fluororesin and the like.
　The organic resin may be the same as or different from the organic resin contained in the adhesive described later.
[0025]
　In order to ensure the insulating performance between the electromagnetic steel sheets 40 laminated with each other, the thickness of the insulating film (thickness per one side of the electromagnetic steel sheets 40) is preferably 0.1 μm or more.
　On the other hand, the insulating effect is saturated as the insulating film becomes thicker. Further, as the insulating film becomes thicker, the space factor decreases, and the performance as an adhesive laminated core deteriorates. Therefore, the insulating coating should be as thin as possible to ensure the insulating performance. The thickness of the insulating film (thickness per one side of the electromagnetic steel sheet 40) is preferably 0.1 μm or more and 5 μm or less, and more preferably 0.1 μm or more and 2 μm or less.
　The thickness of the insulating film can be measured, for example, by observing the cut surface of the electromagnetic steel sheet 40 cut in the thickness direction with a microscope or the like.
[0026]
　As the electromagnetic steel sheet 40 becomes thinner, the effect of improving iron loss gradually saturates. Further, as the electromagnetic steel sheet 40 becomes thinner, the manufacturing cost of the electrical steel sheet 40 increases. Therefore, the thickness of the electrical steel sheet 40 is preferably 0.10 mm or more in consideration of the effect of improving iron loss and the manufacturing cost.
　On the other hand, if the electromagnetic steel sheet 40 is too thick, the press punching operation of the electrical steel sheet 40 becomes difficult. Therefore, considering the press punching work of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.65 mm or less.
　Further, as the electromagnetic steel sheet 40 becomes thicker, the iron loss increases. Therefore, considering the iron loss characteristics of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.35 mm or less, more preferably 0.25 mm or less, and even more preferably 0.20 mm or less.
　In consideration of the above points, the thickness of each electrical steel sheet 40 is, for example, preferably 0.10 mm or more and 0.65 mm or less, more preferably 0.10 mm or more and 0.35 mm or less, and 0.10 mm or more and 0.25 mm or less. Further preferably, it is particularly preferably 0.10 mm or more and 0.20 mm or less. The thickness of the electrical steel sheet 40 includes the thickness of the insulating coating.
　The thickness of the electromagnetic steel sheet 40 can be measured by, for example, a micrometer or the like.
[0027]
　As shown in FIG. 3, the plurality of electromagnetic steel sheets 40 forming the stator core 21 are laminated via the adhesive portion 41. The adhesive portion 41 is formed on the core back portion 22 and the teeth portion 23 of the stator core 21. The adhesive portion 41 is formed as 41a, 41b, 41c from the inner circumference of the core back portion 22 toward the inside in the radial direction (toward the central axis O of the core back portion 22 along the radial direction). .. Adhesive portions 41b and 41c are formed on the plurality of tooth portions 23, respectively. Adhesive portions 41a are formed on the core back portions 22 at positions corresponding to the plurality of teeth portions 23, respectively.
[0028]
　The adhesive portion 41 is a layer formed of an adhesive containing an organic resin and an inorganic filler.
　The organic resin constituting the adhesive is not particularly limited, and examples thereof include a polyolefin resin, an acrylic resin, a polyurethane resin, an epoxy resin, a polyamide resin, a polyimide resin, a polyester resin, a silicone resin, and a fluorine resin.
　As the organic resin, an acrylic-modified epoxy resin obtained by graft-polymerizing an acrylic resin with an epoxy resin is preferable from the viewpoint of easily increasing the adhesive strength of the adhesive portion 41.
[0029]
　Examples of the epoxy resin include those obtained by condensing epichlorohydrin and bisphenol in the presence of an alkali catalyst, and epichlorohydrin and bisphenol condensed into a low molecular weight epoxy resin in the presence of an alkali catalyst. Examples thereof include those obtained by subjecting a low molecular weight epoxy resin and bisphenol to a double addition reaction. Here, the "low molecular weight epoxy resin" means an epoxy resin having a number average molecular weight of less than 1200.
　The epoxy resin may be an epoxy ester resin in which a divalent carboxylic acid is combined. Examples of the divalent carboxylic acid include succinic acid, adipic acid, himeric acid, azelaic acid, sebacic acid, dodecanedioic acid, hexahydrophthalic acid and the like.
　Examples of bisphenol include bisphenol A, bisphenol F, bisphenol AD ​​and the like, and bisphenol A and bisphenol F are preferable.
　Examples of the alkaline catalyst include sodium hydroxide, potassium hydroxide and the like.
　One of these epoxy resins may be used alone, or two or more of these epoxy resins may be used in combination.
[0030]
　The number average molecular weight of the epoxy resin is preferably 1200 to 8000, more preferably 2000 to 7000, and even more preferably 2500 to 7000. When the number average molecular weight of the epoxy resin is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the number average molecular weight of the epoxy resin is not more than the above upper limit value, the stability of the adhesive portion 41 can be easily improved.
　The number average molecular weight of the epoxy resin can be measured by size exclusion chromatography (SEC: Size-Exclusion Chromatography) described in JIS K7252-1: 2008 using polystyrene as a standard substance.
[0031]
　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 adhesive. When the content of the epoxy resin is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the content of the epoxy resin is not more than the above upper limit value, it is easy to alleviate the strain generated in the electromagnetic steel sheet 40.
[0032]
　Examples of the acrylic resin include an acrylic resin obtained by polymerizing or copolymerizing at least one selected from unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, and crotonic acid, and the above-mentioned unsaturated carboxylic acid. Examples thereof include an acrylic resin obtained by copolymerizing at least one monomer selected from the above and at least one selected from the following radically polymerizable unsaturated monomers.
　Examples of the radically polymerizable unsaturated monomer include (1) 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate and the like, and the number of carbon atoms of acrylate or methacrylic acid is high. 1 to 8 hydroxyalkyl esters, (2) Methyl acrylate, Methyl methacrylate, Ethyl acrylate, Ethyl methacrylate, n-butyl acrylate, n-butyl methacrylate, Isobutyl acrylate, Isobutyl methacrylate, Acrylic acid tert-butyl, tert-butyl methacrylate, cyclohexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, decyl acrylate, etc. Alkyl ester or cycloalkyl ester having 1 to 24 carbon atoms of acrylic acid or methacrylic acid, (3) acrylamide, methacrylic acid, N-methylacrylamide, N-ethylacrylamide, diacetoneacrylamide, N-methylolacrylamide. , N-methylolmethacrylicamide, N-methoxymethylacrylamide, N-butoxymethylacrylamide, functional acrylamide or functional methacrylicamide, (4) styrene, vinyltoluene, α-methylstyrene, etc. Examples thereof include (5) aliphatic vinyl monomers such as vinyl acetate, vinyl propionate, acrylonitrile, and methacrylic acid.
[0033]
　Preferred combinations of the above unsaturated monomers include, for example, a combination of methyl methacrylate, 2-ethylhexyl acrylate and acrylic acid, a combination of styrene, methyl methacrylate, ethyl acrylate and methacrylic acid, and styrene and acrylic. Examples thereof include a combination of ethyl acetate and methacrylic acid, a combination of methyl methacrylate, ethyl acrylate and acrylic acid.
[0034]
　The number average molecular weight of the acrylic resin is preferably 5000 to 100,000, more preferably 6000 to 80,000, and even more preferably 7,000 to 60,000. When the number average molecular weight of the acrylic resin is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the number average molecular weight of the acrylic resin is not more than the above upper limit value, it is easy to prevent the adhesive from becoming highly viscous, and it is easy to flatten the adhesive portion 41.
　The number average molecular weight of the acrylic resin can be measured by the same method as the number average molecular weight of the epoxy resin.
[0035]
　The content of the acrylic resin is, for example, preferably 10 to 40% by mass, more preferably 15 to 35% by mass, still more preferably 20 to 30% by mass, based on the total mass of the adhesive. When the content of the acrylic resin is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the content of the acrylic resin is not more than the above upper limit value, it is easy to prevent the adhesive from becoming highly viscous, and it is easy to flatten the adhesive portion 41. Therefore, it is easy to suppress the distortion of the adhesive laminated core.
[0036]
　Acrylic-modified epoxy resin obtained by graft-polymerizing an acrylic resin on an epoxy resin (hereinafter, also referred to as “grafted product”) is a high-molecular-weight epoxy in the presence of a radical generator such as benzoyl peroxide in an organic solvent solution, for example. It is obtained by subjecting the resin to a graft polymerization reaction with the above-mentioned radically polymerizable unsaturated monomer. Here, the "high molecular weight epoxy resin" means an epoxy resin having a number average molecular weight of 1200 or more.
　The radical generator used in the graft polymerization reaction is preferably 3 to 15 parts by mass with respect to 100 parts by mass of the solid content of the radically polymerizable unsaturated monomer.
[0037]
　The graft polymerization reaction requires, for example, 1 to 3 hours for a radically polymerizable unsaturated monomer in which a radical generator is uniformly mixed with an organic solvent solution of a high molecular weight epoxy resin heated to 80 to 150 ° C. It can be carried out by adding the mixture and keeping the same temperature for 1 to 3 hours.
[0038]
　The organic solvent used in the graft polymerization reaction may be any organic solvent that dissolves the high molecular weight epoxy resin and the radically polymerizable unsaturated monomer and can be mixed with water.
　Examples of such an organic solvent include isopropanol, butyl alcohol, 2-hydroxy-4-methylpentane, 2-ethylhexyl alcohol, cyclohexanol, ethylene glycol, diethylene glycol, 1,3-butylene glycol, ethylene glycol monoethyl ether, and the like. Examples thereof include alcohol solvents such as ethylene glycol monobutyl ether and diethylene glycol monomethyl ether, ketone solvents such as acetone and methyl ethyl ketone, cellosolve solvents and carbitol solvents. Further, an inert organic solvent that is immiscible with water can also be used, and examples of such an organic solvent include aromatic hydrocarbons such as toluene and xylene, and esters such as ethyl acetate and butyl acetate. ..
[0039]
　If the adhesive contains an epoxy resin, the curing agent can be a commonly used epoxy resin curing agent. Examples of the epoxy resin curing agent include polyamine-based curing agents such as aliphatic polyamines, alicyclic polyamines, aromatic polyamines, polyamide polyamines, and modified polyamines; monofunctional acid anhydrides (phthalic anhydride, hexahydrophthalic anhydride, Methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylnadic anhydride, chlorendic anhydride, etc.), bifunctional acid anhydride (pyromellitic anhydride, benzophenonetetracarboxylic anhydride, ethylene glycol bis (Ann) Hydrotrimate), methylcyclohexenetetracarboxylic acid anhydride, etc.), free acid anhydride (trimellitic anhydride, polyazelineic acid anhydride, etc.) and other acid anhydride-based curing agents; novolak type or resol type phenol resin, A methylol group-containing initial condensate such as a urea resin or a melamine resin; at least one selected from a latent curing agent and the like can be used.
　Examples of the latent curing agent include dicyandiamide, melamine, organic acid dihydrazide, amineimide, ketimine, tertiary amine, imidazole salt, boron trifluoride amine salt, and a microcapsule type curing agent (the curing agent is formed of casein or the like. Encapsulated in microcapsules, breaks microcapsules by heating and pressurizing, and cures with resin), molecular sieve type curing agent (curing agent is adsorbed on the surface of adsorptive compound, adsorbed molecules by heating , Which releases and reacts with the resin) and the like.
[0040]
　As the epoxy resin curing agent, a novolak type phenol resin (phenol novolac resin) is preferable from the viewpoint of easily increasing the adhesive strength of the adhesive portion 41. Here, the "novolak-type phenol resin" means a resin obtained by subjecting phenols and aldehydes to a condensation reaction using an acid catalyst.
　Examples of phenols include phenol.
　Examples of aldehydes include formaldehyde.
　Examples of the acid catalyst include oxalic acid and divalent metal salts.
　Novolac-type phenolic resins are solid at room temperature (25 ° C.) and are classified as thermoplastic resins. In the novolak type phenol resin, -CH 2 OH groups are hardly bonded to the phenol nuclei (aromatic rings) constituting the phenol resin .
[0041]
　The content of the epoxy resin curing agent is preferably 1 to 20% by mass, for example, with respect to the total mass of the adhesive. When the content of the epoxy resin curing agent is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the content of the epoxy resin curing agent is not more than the above upper limit value, the stability of the adhesive portion 41 can be easily improved.
[0042]
　The adhesive may include an elastomer. Examples of the elastomer include natural rubber and synthetic rubber, and synthetic rubber is preferable.
　Examples of the synthetic rubber include polybutadiene-based synthetic rubber, nitrile-based synthetic rubber, and chloroprene-based synthetic rubber.
　Examples of the polybutadiene synthetic rubber include isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), polyisobutylene (butyl rubber, IIR), ethylene propylene diene rubber (EPDM) and the like.
　Examples of the nitrile-based synthetic rubber include acrylonitrile butadiene rubber (NBR) and acrylic rubber (ACM).
　Examples of the chloroprene-based synthetic rubber include chloroprene rubber (CR).
　As the synthetic rubber, in addition to the above, urethane rubber, silicone rubber, fluororubber (FKM), chlorosulfonated polyethylene (CSM), epichlorohydrin rubber (ECO) and the like may be used.
　As the elastomer, SBR, EPDM, and NBR are preferable from the viewpoints of excellent heat resistance and easy relaxation of strain generated in the electromagnetic steel sheet 40.
　As the elastomer, one type may be used alone, or two or more types may be used in combination.
[0043]
　The content of the elastomer is preferably 5 to 30% by mass with respect to the total mass of the adhesive. When the content of the elastomer is at least the above lower limit value, it is easy to alleviate the strain generated in the electromagnetic steel sheet 40.
When the content of the elastomer is not more than the above upper limit value, it is easy to increase the adhesive strength of the adhesive portion 41.
[0044]
　The content of the organic resin is, for example, preferably 40 to 95% by mass, more preferably 50 to 90% by mass, still more preferably 60 to 80% by mass, based on the total mass of the adhesive. When the content of the organic resin is at least the above lower limit value, it is easy to increase the adhesive strength of the adhesive portion 41. When the content of the organic resin is not more than the above upper limit value, it is easy to prevent the adhesive from becoming highly viscous, and it is easy to flatten the adhesive portion 41. Therefore, it is easy to suppress the distortion of the adhesive laminated core.
[0045]
　Examples of the inorganic filler include metal oxides such as aluminum oxide (α-alumina), zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide and tin oxide; aluminum hydroxide (gibsite), calcium hydroxide and water. Metal hydroxides such as magnesium oxide; silicon-containing substances such as silica, diatomaceous earth, calcium silicate and talc; sulfates such as calcium sulfate, magnesium sulfate and barium sulfate can be mentioned.
　As the inorganic filler, one type may be used alone, or two or more types may be used in combination.
　As the inorganic filler, one or more selected from metal oxides and metal hydroxides is preferable, and one or more selected from aluminum hydroxide and aluminum oxide is more preferable, and aluminum hydroxide is more preferable, from the viewpoint of being inexpensive and easily available. More preferred.
[0046]
　The 50% particle size of the inorganic filler is 0.2 to 3.5 μm, preferably 0.4 to 3.0 μm, and more preferably 0.6 to 2.5 μm. When the 50% particle size of the inorganic filler is at least the above lower limit value, it is easy to suppress the expansion and contraction of the adhesive portion 41. When the 50% particle size of the inorganic filler is not more than the above upper limit value, the space factor of the adhesive laminated core is likely to be increased.
　When the inorganic filler is a metal oxide, the 50% particle size of the inorganic filler is preferably 1.0 to 3.5 μm, more preferably 1.5 to 3.2 μm, and even more preferably 2.0 to 3.0 μm.
　When the inorganic filler is a metal hydroxide, the 50% particle size of the inorganic filler is preferably 0.2 to 3.0 μm, more preferably 0.5 to 2.5 μm, still more preferably 1.0 to 2.0 μm. ..
[0047]
　The 90% particle size of the inorganic filler is 10.0 μm or less, preferably 8.0 μm or less, and more preferably 6.0 μm or less. When the 90% particle size of the inorganic filler is not more than the above upper limit value, the adhesive portion 41 can be easily flattened. Therefore, it is easy to suppress the distortion of the adhesive laminated core. The lower limit of the 90% particle size of the inorganic filler is not particularly limited, but is substantially 2.0 μm.
　When the inorganic filler is a metal oxide, the 90% particle size of the inorganic filler is preferably 10.0 μm or less, more preferably 9.5 μm or less, still more preferably 9.0 μm or less.
　When the inorganic filler is a metal hydroxide, the 90% particle size of the inorganic filler is preferably 9.0 μm or less, more preferably 8.0 μm or less, still more preferably 7.0 μm or less.
　In the present specification, the 50% particle size and the 90% particle size represent volume-based particle sizes in the cumulative particle size distribution. The 50% particle size and 90% particle size can be measured using a laser diffraction / scattering type particle size distribution measuring device. The 50% particle size represents the particle size when the integrated amount occupies 50% on a volume basis in the cumulative particle size curve of the particle size distribution measured by using the laser diffraction / scattering type particle size distribution measuring device. The 90% particle size represents the particle size when the integrated amount occupies 90% on a volume basis in the cumulative particle size curve of the particle size distribution measured by using the laser diffraction / scattering type particle size distribution measuring device.
　The 90% particle size of the inorganic filler can be adjusted by passing through a sieve having a specific opening, a wind power classification method, or the like.
[0048]
　The maximum particle size of the inorganic filler is preferably 30.0 μm or less, more preferably 20.0 μm or less, and even more preferably 10.0 μm or less. When the maximum particle size of the inorganic filler is not more than the above upper limit value, the adhesive portion 41 can be easily flattened. Therefore, it is easy to suppress the distortion of the adhesive laminated core.
The lower limit of the maximum particle size of the inorganic filler is not particularly limited, but is substantially 3.0 μm.
　When the inorganic filler is a metal oxide, the maximum particle size of the inorganic filler is preferably 20.0 μm or less, more preferably 15.0 μm or less, still more preferably 10.0 μm or less.
　When the inorganic filler is a metal hydroxide, the maximum particle size of the inorganic filler is preferably 15.0 μm or less, more preferably 10.0 μm or less, and even more preferably 8.0 μm or less.
　The maximum particle size of the inorganic filler can be measured using a laser diffraction / scattering type particle size distribution measuring device. The maximum particle size of the inorganic filler is given by the maximum value of all particles measured using a laser diffraction / scattering particle size distribution measuring device.
　The maximum particle size of the inorganic filler can be adjusted by passing through a sieve having a specific opening, a wind power classification method, or the like.
[0049]
　The content of the inorganic filler is 5 to 50 parts by mass, preferably 5 to 40 parts by mass, more preferably 5 to 30 parts by mass, and even more preferably 10 to 30 parts by mass with respect to 100 parts by mass of the organic resin. When the content of the inorganic filler is at least the above lower limit value, it is easy to suppress the expansion and contraction of the adhesive portion 41. When the content of the inorganic filler is not more than the above upper limit value, the space factor of the adhesive laminated core is likely to be increased.
　When the inorganic filler is a metal oxide, the content of the inorganic filler is preferably 10 to 50 parts by mass, more preferably 15 to 40 parts by mass, still more preferably 20 to 30 parts by mass with respect to 100 parts by mass of the organic resin. ..
　When the inorganic filler is a metal hydroxide, the content of the inorganic filler is preferably 5 to 45 parts by mass, more preferably 10 to 40 parts by mass, and further preferably 15 to 35 parts by mass with respect to 100 parts by mass of the organic resin. preferable.
[0050]
　The adhesive of the present embodiment may contain an optional component in addition to the organic resin and the inorganic filler. Optional components include conductive substances, rust preventive additives such as sparingly soluble chromate, coloring pigments (for example, condensed polycyclic organic pigments, phthalocyanine organic pigments, etc.), coloring dyes (for example, azo dyes, azo). Metal complex salt dyes, etc.), film forming aids, dispersibility improvers, antifoaming agents, etc.
　These optional components may be used alone or in combination of two or more.
[0051]
　When the adhesive contains an arbitrary component, the content of the optional component is preferably 1 to 10 parts by mass with respect to 100 parts by mass of the organic resin.
[0052]
　As the adhesive of the present embodiment, in addition to a thermosetting type adhesive, a radical polymerization type adhesive or the like can be used, and from the viewpoint of productivity, it is desirable to use a room temperature curing type adhesive. .. The room temperature curable adhesive cures at 20 ° C to 30 ° C. As the room temperature curing type adhesive, an acrylic adhesive is preferable. Typical acrylic adhesives include SGA (Second Generation Acrylic Adhesives. Second Generation Acrylic Adhesive) and the like. An anaerobic adhesive, an instant adhesive, and an elastomer-containing acrylic adhesive can be used as long as the effects of the present invention are not impaired. The adhesive referred to here refers to a state before curing, and becomes an adhesive portion 41 after the adhesive is cured.
[0053]
　The average tensile elastic modulus E of the bonded 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 bonded portion 41 is less than 1500 MPa, there will be a problem that the rigidity of the laminated core is lowered. Therefore, the lower limit of the average tensile elastic modulus E of the adhesive portion 41 is 1500 MPa, more preferably 1800 MPa. On the contrary, if the average tensile elastic modulus E of the adhesive portion 41 exceeds 4500 MPa, a problem occurs in which the insulating film formed on the surface of the electromagnetic steel sheet 40 is peeled off. Therefore, the upper limit of the average tensile elastic modulus E of the adhesive portion 41 is 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 in accordance with JIS R 1602: 1995.
　More specifically, first, a sample for measurement (not shown) is produced. This sample is obtained by adhering two electromagnetic steel sheets 40 together with an adhesive to be measured and curing them to form an adhesive portion 41. When the adhesive is a thermosetting type, this curing is performed by heating and pressurizing under the heating and pressurizing conditions in actual operation. On the other hand, when the adhesive is a room temperature curing type, it is performed by pressurizing at room temperature.
　Then, the tensile elastic modulus of this sample is measured by the resonance method. As described above, the method for measuring the tensile elastic modulus by the resonance method is performed in accordance with JIS R 1602: 1995. After that, the tensile elastic modulus of the bonded portion 41 alone can be obtained by removing the influence of the electromagnetic steel sheet 40 itself from the tensile elastic modulus (measured value) of the sample by calculation.
　Since the tensile elastic modulus obtained from the sample in this way is equal to the average value of the entire laminated core, this value is regarded as the average tensile elastic modulus E. The composition of the average tensile elastic modulus E is set so that it hardly changes at the stacking position along the stacking direction or at the circumferential position around the central axis of the laminated core. Therefore, the average tensile elastic modulus E can be set to a value obtained by measuring the cured bonded portion 41 at the upper end position of the laminated core.
[0054]
　As the bonding method, for example, a method of applying an adhesive to the electromagnetic steel sheet 40 and then bonding by heating and / or pressure bonding can be adopted. The heating means may be any means such as heating in a high temperature bath or an electric furnace, or a method of directly energizing.
[0055]
　In order to obtain stable and sufficient adhesive strength, the thickness of the adhesive portion 41 is preferably 1 μm or more.
　On the other hand, when the thickness of the adhesive portion 41 exceeds 100 μm, the adhesive force is saturated. Further, as the adhesive portion 41 becomes thicker, the space factor decreases, and the magnetic properties such as iron loss of the adhesive laminated core decrease. Therefore, the thickness of the adhesive portion 41 is preferably 1 μm or more and 100 μm or less, and more preferably 1 μm or more and 10 μm or less.
　In the above, the thickness of the adhesive portion 41 means the average thickness of the adhesive portion 41.
[0056]
　The average thickness of the bonded portion 41 is more preferably 1.0 μm or more and 3.0 μm or less. If the average thickness of the adhesive portion 41 is less than 1.0 μm, sufficient adhesive strength cannot be secured as described above. Therefore, the lower limit of the average thickness of the adhesive portion 41 is 1.0 μm, more preferably 1.2 μm. On the contrary, if the average thickness of the bonded portion 41 becomes thicker than 3.0 μm, problems such as a large increase in the amount of strain of the electromagnetic steel sheet 40 due to shrinkage during thermosetting occur. Therefore, the upper limit of the average thickness of the adhesive portion 41 is 3.0 μm, more preferably 2.6 μm.
　The average thickness of the adhesive portion 41 is an average value of the entire adhesive laminated core. The average thickness of the adhesive portion 41 is almost the same at the lamination position along the lamination direction and the circumferential position around the central axis of the adhesive lamination core. Therefore, the average thickness of the adhesive portion 41 can be set as the average value of the numerical values ​​measured at 10 or more points in the circumferential direction at the upper end position of the adhesive laminated core.
[0057]
　The average thickness of the adhesive portion 41 can be adjusted by changing, for example, the amount of the adhesive applied. Further, the average tensile elastic modulus E of the adhesive portion 41 is adjusted, for example, in the case of a thermosetting type adhesive by changing one or both of the heating and pressurizing conditions applied at the time of adhesion and the type of curing agent. Can be done.
[0058]
　In the present embodiment, the plurality of electrical steel sheets 40 forming the rotor core 31 are fixed to each other by caulking C (dowels). However, a plurality of electrical steel sheets 40 forming the rotor core 31 may be bonded to each other by the bonding portion 41.
　The adhesive laminated core such as the stator core 21 and the rotor core 31 may be formed by so-called rotating stacking.
[0059]
　Hereinafter, a method for manufacturing an adhesive laminated core according to an embodiment of the present invention will be described with reference to the drawings.
　The stator core 21 can be manufactured by applying an adhesive to a part of the surface of the electromagnetic steel sheet 40, then stacking it on another electrical steel sheet and crimping it, and repeating the operation of forming the adhesive portion 41.
[0060]
　Hereinafter, a method of manufacturing the stator core 21 by using the manufacturing apparatus 100 shown in FIG. 4 will be described.
　First, the manufacturing apparatus 100 will be described. In the manufacturing apparatus 100, the original steel sheet P is sent out from the coil Q (hoop) in the direction of the arrow F, and punched a plurality of times by the dies arranged on each stage to gradually form the shape of the electromagnetic steel sheet 40. An adhesive is applied to a predetermined position on the lower surface of the second and subsequent electrical steel sheets 40, and the punched electrical steel sheets 40 are sequentially laminated and crimped.
[0061]
　As shown in FIG. 4, the manufacturing apparatus 100 is arranged adjacent to the first-stage punching station 110 at a position closest to the coil Q and on the downstream side of the punching station 110 along the transport direction of the original steel plate P. A step punching station 120 and an adhesive application station 130 arranged adjacent to the punching station 120 on the downstream side are provided.
　The punching station 110 includes a female die 111 arranged below the original steel plate P and a male die 112 arranged above the original steel plate P.
　The punching station 120 includes a female die 121 arranged below the original steel plate P and a male die 122 arranged above the original steel plate P.
　The adhesive application station 130 includes an applicator 131 including a plurality of injectors arranged according to an adhesive application pattern.
[0062]
　The manufacturing apparatus 100 further includes a laminating station 140 at a position downstream of the adhesive application station 130. 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 original steel plate P. On the other hand, the outer peripheral punched male die 144 and the spring 145 are arranged above the original steel plate P.
[0063]
　In the manufacturing apparatus 100, first, the original steel plate P is sequentially fed from the coil Q in the direction of the arrow F in FIG. Then, the original steel sheet P is first punched by the punching station 110. Subsequently, the original steel sheet P is punched by the punching station 120. 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 original steel plate P (the punching step). However, since it is not completely punched at this point, the process proceeds to the next step along the arrow F direction. At the adhesive application station 130 in the next step, the adhesive supplied from each of the injectors of the coater 131 is applied in dots (coating step).
[0064]
　Next, the original steel sheet P is sent out to the laminating station 140, punched out by the outer peripheral punching die 144, and laminated with high accuracy (lamination process). At the time of this lamination, the electromagnetic steel sheet 40 receives a constant pressing force by the spring 145. By sequentially repeating the punching process, the coating process, and the laminating process as described above, a predetermined number of electrical steel sheets 40 can be stacked. Further, the iron core formed by stacking the electromagnetic steel sheets 40 in this way is heated by the heating device 141 to, for example, 60 to 200 ° C. By this heating, the adhesive is cured and the adhesive portion 41 is formed (curing step).
　The stator core 21 is completed by each of the above steps.
[0065]
　As described above, in the rotary electric machine and the adhesive laminated core according to the present embodiment, a plurality of electromagnetic steel sheets whose both sides are coated with an insulating coating are laminated, and the space between the electromagnetic steel sheets adjacent to each other in the lamination direction is organic resin and inorganic. It is adhered at an adhesive portion formed of an adhesive containing a filler. Sufficient adhesive strength can be obtained by adhering the electromagnetic steel sheets to each other at the adhesive portion. Since the adhesive portion contains an inorganic filler, expansion and contraction of the adhesive portion can be suppressed.
　In addition, each adhesive portion contains 5 inorganic fillers having a 50% particle size of 0.2 to 3.5 μm and a 90% particle size of 10.0 μm or less with respect to 100 parts by mass of the organic resin. Contains up to 50 parts by mass. Therefore, the rotary electric machine and the adhesive laminated core according to the present embodiment tend to reduce the gaps between the electromagnetic steel sheets. As a result, the flatness of the adhesive laminated core can be further improved, and the space factor of the adhesive laminated core can be increased.
　The adhesive laminated core according to the present embodiment can further improve the flatness and the space factor. Therefore, the adhesive laminated core according to the present embodiment is suitable as an adhesive laminated core (stator core) for a stator. The adhesive laminated core may be used as a rotor core.
[0066]
　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.
[0067]
　The shape of the stator core is not limited to the shape 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 teeth portion 23, the dimensional ratio in the radial direction between the teeth portion 23 and the core back portion 22, etc. , It can be arbitrarily designed according to the desired characteristics of the rotating electric machine.
[0068]
　In the rotor of the above embodiment, a set of two permanent magnets 32 form one magnetic pole, but the present invention is not limited to this. For example, one permanent magnet 32 ​​may form one magnetic pole, or three or more permanent magnets 32 may form one magnetic pole.
[0069]
　In the above-described embodiment, the permanent magnet field type motor has been described as an example of the rotary electric machine, but the structure of the rotary electric machine is not limited to this as illustrated below, and various publicly known not to be exemplified below. Structure can also be adopted.
　In the above-described embodiment, the permanent magnet field type motor has been described as an example as the synchronous motor, but the present invention is not limited to this. For example, the rotary electric machine may be a reluctance type electric machine or an electromagnet field type electric machine (winding field type electric machine).
　In the above-described embodiment, the synchronous motor has been described as an example of the AC motor, but the present invention is not limited to this. For example, the rotary electric machine may be an induction motor.
　In the above-described embodiment, the AC motor has been described as an example of the motor, but the present invention is not limited to this. For example, the rotary electric machine may be a DC motor.
　In the above-described embodiment, the electric machine has been described as an example of the rotary electric machine, but the present invention is not limited to this. For example, the rotary electric machine may be a generator.
[0070]
　In the above embodiment, the case where the adhesive laminated core according to the present invention is applied to the stator core has been illustrated, but it can also be applied to the rotor core.
[0071]
　In addition, it is possible to replace the components in the embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.
Example
[0072]
[Examples 1 to 6 and Comparative Examples 1 to 4]
　A hoop having a thickness of 0.25 mm was prepared, and an insulating coating treatment liquid containing a metal phosphate and an acrylic resin emulsion was applied to both sides of the hoop at 300 ° C. To form an insulating film of 0.8 μm on one side.
　The hoop on which the insulating film was formed was wound up to form a coil Q. The coil Q was set in the manufacturing apparatus 100 described above, and the original steel plate P was sent out from the coil Q in the direction of the arrow F. Using the manufacturing apparatus 100, a single plate (electromagnetic steel plate 40) having a ring shape with an outer diameter of 300 mm and an inner diameter of 240 mm and provided with 18 rectangular tooth portions having a length of 30 mm and a width of 15 mm on the inner diameter side is punched out. (Punching process).
　Subsequently, while sequentially feeding the punched electrical steel sheets, 5 mg of the adhesive having the composition shown in Table 1 was applied in dots at each position shown in FIG. 3 (coating step), and then laminated (laminated). Process). By repeating the same operation, a laminated body in which 130 electromagnetic steel sheets were laminated was obtained. The obtained laminate was heated at 120 ° C. while pressurizing at a pressure of 10 MPa to cure the adhesive (curing step), and the adhesive laminate core of each example was produced.
[0073]
　In Table 1, the types of each component are as follows.

Acrylic-modified epoxy resin (epoxy resin: bisphenol F type, 60% by mass, acrylic resin: polymer of acrylic acid, 20% by mass, curing agent: novolak type phenol resin, 20% by mass).
[0074]

A1: Aluminum hydroxide (50% particle size 1.5 μm, 90% particle size 6.5 μm, maximum particle size 7.0 μm).
A2: Aluminum oxide (50% particle size 2.5 μm, 90% particle size 8.5 μm, maximum particle size 9.5 μm).
A'1: Silicon dioxide (50% particle size 1.5 μm, 90% particle size 12.0 μm, maximum particle size 15.0 μm).
A'2: Magnesium oxide (50% particle size 2.5 μm, 90% particle size 15.5 μm, maximum particle size 21.0 μm).
[0075]
　In Table 1, the unit of composition of each component is a mass part.
　In Table 1, "-" indicates that the component is not contained.
[0076]
The
　obtained adhesive laminated cores of each example were placed on a flat table, and the height of the adhesive laminated cores was measured at 18 points corresponding to the teeth portion 23 in FIG. Calculate the difference (ΔH) between the maximum and minimum heights of the adhesive laminated core, divide by the average value (average height) of the height of the adhesive laminated core, and divide by the flatness (ΔH / average height). × 100 (%)) was calculated. The average height is the arithmetic mean value of the above 18 locations. The flatness of the adhesive laminated core was evaluated based on the following evaluation criteria. The smaller the flatness ratio, the better the flatness. The results are shown in Table 1.
<< Evaluation Criteria >>
A: Flatness is less than 2%.
B: Flatness is 2% or more and less than 5%.
C: Flatness is 5% or more.
[0077]
The space
　factor (%) of the adhesive laminated core of each obtained example was calculated.
　In this specification, the space factor of the adhesive laminated core is given by the following formula.
　Area ratio (%) = M / (D ・ h ・ S) × 100
　where M is the mass (kg) of the adhesive laminated core and D is the density (kg / m 3 ) of the steel plate (electromagnetic steel plate excluding the insulating film). ), H represents the average height (m) of the adhesive laminated core, and S represents the area (m 2 ) of the electromagnetic steel plate in a plan view . The area S of the electromagnetic steel sheet was determined by capturing the electromagnetic steel sheet before stacking as an image with a scanner and performing image analysis.
　From the calculated value of the space factor, the space rate was evaluated based on the following evaluation criteria. The results are shown in Table 1. <<
Evaluation Criteria >>
A: The space factor is 99% or more.
B: The space factor is 98% or more and less than 99%.
C: The space factor is less than 98%.
[0078]
[table 1]

[0079]
　As shown in Table 1, in Examples 1 to 6 to which the present invention was applied, all of the flatness and the space factor were "A" or "B".
　On the other hand, in Comparative Example 1 in which the content of the inorganic filler was less than the range of the present invention, the space factor was "C".
　In Comparative Example 2 in which the content of the inorganic filler was higher than the range of the present invention, the flatness and the space factor were “C”.
　In Comparative Examples 3 to 4 in which the 90% particle size of the inorganic filler was outside the range of the present invention, the flatness and the space factor were “C”.
[0080]
　From the above results, it was found that the adhesive laminated core of the present invention can further improve the flatness and the space factor.
Industrial applicability
[0081]
　According to the present invention, the flatness of the adhesive laminated core can be further improved and the space factor can be improved. Therefore, the industrial applicability is great.
Code description
[0082]
　10 Rotating electric machine
　20 Stator
　21 Stator core (adhesive laminated core)
　40 Electromagnetic steel plate
　41 Adhesive part
The scope of the claims
[Claim 1]
　Are laminated to each other, a plurality of electromagnetic steel sheets having both surfaces covered with an insulating film,
　provided between the electromagnetic steel plates that are adjacent in the stacking direction, and a bonding portion for bonding the electromagnetic steel plates each,
　the adhesive The adhesive forming the portion contains an organic resin and an inorganic filler, and
　the 50% particle size of the inorganic filler is 0.2 to 3.5 μm, and
　the 90% particle size of the inorganic filler is 10.0 μm or less. An
　adhesive laminated core in which the content of the inorganic filler is 5 to 50 parts by mass with respect to 100 parts by mass of the organic resin.
[Claim 2]
　The adhesive laminated core according to claim 1, wherein the maximum particle size of the inorganic filler is 30.0 μm or less.
[Claim 3]
　The adhesive laminated core according to claim 1 or 2, wherein the inorganic filler contains one or more selected from metal oxides and metal hydroxides.
[Claim 4]
　The adhesive laminated core according to any one of claims 1 to 3, wherein the inorganic filler contains at least one selected from aluminum hydroxide and aluminum oxide.
[Claim 5]
　The adhesive laminated core according to any one of claims 1 to 4, which is used for a stator.
[Claim 6]
　The method for manufacturing an adhesive laminated core according to any one of claims 1 to 5
　, wherein the adhesive is applied to a part of the surface of the electromagnetic steel sheet , and then the adhesive is laminated on another electromagnetic steel sheet and pressure-bonded. , A method for manufacturing an adhesive laminated core, which repeats the operation of forming the adhesive portion.
[Claim 7]
　A rotary electric machine comprising the adhesive laminated core according to any one of claims 1 to 5.