Laminated iron core, iron core block, rotating electrical machine and method for manufacturing iron core block

Abstract

One embodiment of the present invention is a laminated iron core, which includes a plurality of electromagnetic steel plates and a plurality of bonding portions. The plurality of electromagnetic steel plates are stacked on each other, and the plurality of bonding portions are arranged between the electromagnetic steel plates adjacent to each other in a stacking direction, and bond the electromagnetic steel plates to each other respectively. When viewed from the stacking direction, the plurality of bonding portions are formed into strips each extending in a first direction, and the plurality of bonding portions are configured to be arranged in a second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel plates is greater than 30° and less than 90°.

Description

Technical Field

[0001] The invention relates to a laminated iron core, an iron core block, a rotating electrical machine and a method for manufacturing the iron core block.

[0002] This application claims priority based on Japanese Patent Application No. 2018-235856 filed in Japan on December 17, 2018, Japanese Patent Application No. 2018-235872 filed in Japan on December 17, 2018, Japanese Patent Application No. 2019-118338 filed in Japan on June 26, 2019, and Japanese Patent Application No. 2019-118339 filed in Japan on June 26, 2019, and the contents of which are cited herein. Background Art

[0003] Conventionally, there is known a laminated iron core as described in the following Patent Document 1. In this laminated iron core, electromagnetic steel sheets adjacent to each other in a lamination direction are bonded together by an adhesive layer.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-023523 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the above-mentioned conventional laminated core, there is still room for improvement in terms of improving magnetic properties.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the magnetic characteristics of a laminated iron core.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, the present invention proposes the following means.

[0012] (1) One embodiment of the present invention is a laminated iron core, comprising a plurality of electromagnetic steel plates stacked on each other, and a plurality of bonding portions, wherein the plurality of electromagnetic steel plates are stacked on each other, the plurality of bonding portions are arranged between the electromagnetic steel plates adjacent to each other in a stacking direction, and respectively bond the electromagnetic steel plates to each other, wherein the plurality of bonding portions are formed into strips extending in a first direction when viewed from the stacking direction, and the plurality of bonding portions are arranged to be arranged in a second direction orthogonal to the first direction, and an angle between the first direction and a rolling direction of the electromagnetic steel plates is not less than 30° and not more than 90°.

[0013] (2) In the laminated iron core described in (1) above, an angle formed by the first direction and the rolling direction of the electromagnetic steel sheet may be equal to or greater than 52.3°.

[0014] (3) In the laminated iron core described in (1) or (2), a width dimension of the bonding portion may be smaller than a spacing dimension between adjacent bonding portions in the second direction.

[0015] (4) In the laminated core described in (3), a width dimension of the bonding portion may be 67%±5% of a spacing dimension between adjacent bonding portions in the second direction.

[0016] (5) In the laminated iron core described in (4), the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet may be 75°±5°.

[0017] (6) In the laminated iron core described in (1) or (2), a width dimension of the bonding portion may be larger than a distance dimension between adjacent bonding portions in the second direction.

[0018] (7) It may also be that in the laminated iron core described in (6), the structure is as follows: the width dimension of the bonding portion is 167%±5% relative to the spacing dimension between adjacent bonding portions in the second direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than 85°.

[0019] (8) It may also be that, in the laminated iron core described in (6), the structure is as follows: the width dimension of the bonding portion is 233%±5% relative to the spacing dimension between adjacent bonding portions in the second direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than 85°.

[0020] (9) One embodiment of the present invention is a laminated iron core, which includes a plurality of electromagnetic steel plates and a plurality of bonding portions, wherein the plurality of electromagnetic steel plates are stacked on each other, and the plurality of bonding portions are arranged between the electromagnetic steel plates adjacent to each other in a stacking direction, and respectively bond the electromagnetic steel plates to each other, wherein the plurality of bonding portions are formed into strips extending in a first direction when viewed from the stacking direction, and the plurality of bonding portions are arranged to be arranged in a second direction orthogonal to the first direction, and the width dimension of the bonding portion is less than 368% of the spacing dimension between adjacent bonding portions in the second direction.

[0021] (10) In the laminated iron core described in any one of (1) to (9), the average thickness of the bonding portion may be 1.0 μm to 3.0 μm.

[0022] (11) In the laminated iron core described in any one of (1) to (10), the average tensile modulus E of the bonding portion may be 1500 MPa to 4500 MPa.

[0023] (12) In the laminated iron core described in any one of (1) to (11), the bonding portion may be a room temperature bonding type acrylic adhesive, and the acrylic adhesive may include SGA composed of an acrylic adhesive containing an elastomer.

[0024] (13) One embodiment of the present invention is an iron core block, which is formed by connecting a plurality of iron cores into a ring shape to form a stacked iron core; the iron core block includes a plurality of electromagnetic steel sheets and a plurality of bonding portions, the plurality of electromagnetic steel sheets are stacked on each other, the plurality of bonding portions are arranged between the electromagnetic steel sheets adjacent to each other in the stacking direction, and the electromagnetic steel sheets are bonded to each other respectively, and when viewed from the stacking direction, the plurality of bonding portions are formed into strips extending in a first direction respectively, and the plurality of bonding portions are arranged to be arranged in a second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheets is greater than 45° and less than 90°.

[0025] (14) In the core block described in (13), the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet may be 52.3° or more.

[0026] (15) It may also be that the core block described in (13) or (14) is configured as follows: it includes an arc-shaped core back and a tooth portion protruding radially from the core back, and the tooth portion extends along the rolling direction.

[0027] (16) In the core block described in any one of (13) to (15), the width dimension of the bonding portion may be smaller than the spacing dimension between adjacent bonding portions in the second direction.

[0028] (17) In the core block described in (16), a width dimension of the bonding portion may be 60% or less of a spacing dimension between adjacent bonding portions in the second direction.

[0029] (18) In the core block described in (17), a width dimension of the bonding portion may be 43% or less relative to a spacing dimension between adjacent bonding portions in the second direction.

[0030] (19) It may also be that, in the iron core block described in (17), the structure is as follows: the width dimension of the bonding portion is 43%±5% relative to the spacing dimension between adjacent bonding portions in the second direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than 45°.

[0031] (20) It may also be that in the iron core block described in (16), the structure is as follows: the width dimension of the bonding portion is 60%±5% relative to the spacing dimension between adjacent bonding portions in the second direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than 60°.

[0032] (21) In the core block described in any one of (13) to (15), the width dimension of the bonding portion may be larger than the spacing dimension between adjacent bonding portions in the second direction.

[0033] (22) It may also be that, in the iron core block described in (21), the structure is as follows: the width dimension of the bonding portion is 150%±5% relative to the spacing dimension between adjacent bonding portions in the second direction, and the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than 85°.

[0034] (23) In the core block described in any one of (13) to (22), the average thickness of the bonding portion may be 1.0 μm to 3.0 μm.

[0035] (24) In the core block described in any one of (13) to (23), the average tensile modulus E of the bonding portion may be 1500 MPa to 4500 MPa.

[0036] (25) In the core block described in any one of (13) to (24), the bonding portion may be a room temperature bonding type acrylic adhesive, and the acrylic adhesive may include SGA composed of an acrylic adhesive containing an elastomer.

[0037] (26) One aspect of the present invention is a laminated core comprising a plurality of core blocks according to any one of (13) to (25) connected in an annular shape.

[0038] (27) One aspect of the present invention is a rotating electrical machine including the laminated core described in any one of (1) to (12) and (26).

[0039] (28) One embodiment of the present invention is a method for manufacturing an iron core block, which comprises a first step of punching out a plurality of electromagnetic steel sheet sheets from an electromagnetic steel plate, and a second step of providing bonding portions between the plurality of electromagnetic steel sheet sheets and stacking them; in the first step, the electromagnetic steel sheet sheets are punched out in such a manner that the teeth extend along the rolling direction of the electromagnetic steel sheet; in the second step, the plurality of bonding portions are formed into strips each extending in the first direction when viewed from the stacking direction, and the plurality of bonding portions are arranged to be arranged in a second direction orthogonal to the first direction, and the plurality of electromagnetic steel sheet sheets are stacked so that the angle between the first direction and the rolling direction is greater than 45° and less than 90°.

[0040] (29) In the method for manufacturing a core block described in (28), the structure may be as follows: the width dimension of the bonding portion is smaller than the spacing dimension between adjacent bonding portions in the second direction.

[0041] Effects of the Invention

[0042] According to the present invention, the magnetic characteristics of the laminated core can be improved.

[0043] BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a cross-sectional view of the rotating electrical machine according to the first embodiment.

[0045] Figure 2 It is a plan view of a stator included in the rotating electrical machine according to the first embodiment.

[0046] Figure 3 It is a front view of the stator with which the rotating electrical machine of the first embodiment is equipped.

[0047] Figure 4 It is a schematic diagram of the electromagnetic steel sheet and the bonding portion according to the first embodiment.

[0048] Figure 5 It is a top view of the rotating electrical machine according to the second embodiment.

[0049] Figure 6 It is a schematic diagram of the electromagnetic steel sheet and the bonding portion according to the second embodiment.

[0050] Figure 7 It is a schematic diagram of the bonding portion of the stator according to the modified example.

[0051] Figure 8 This is a graph showing the iron loss corresponding to the ratio and angle of the width dimension and the spacing dimension of the bonding portion in the first verification test.

[0052] Fig. 9It is a top view of the stator core of the reference model used as the simulation object of the iron loss in the second verification test, and is a top view showing a state where the electromagnetic steel sheets are caulked and joined. DETAILED DESCRIPTION

[0053] Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in this embodiment, as the rotating electrical machine, an electric motor, specifically an AC motor, more specifically a synchronous motor, and more specifically a permanent magnet field type motor is cited as an example for description. Such an electric motor is preferably used in, for example, an electric vehicle, etc.

[0054] (First embodiment)

[0055] First, based on Figure 1 to Figure 4 , a rotary electric machine 10 according to a first embodiment will be described.

[0056] like Figure 1 and Figure 2 As shown, the rotary electric machine 10 of the first embodiment includes a stator 20, a rotor 30, a case 50, and a rotating shaft 60. The stator 20 and the rotor 30 are accommodated in the case 50. The stator 20 is fixed to the case 50.

[0057] In the rotating electrical machine 10 of the present embodiment, for example, an exciting current having an effective value of 10A and a frequency of 100 Hz can be applied to each phase of the stator 20 , whereby the rotor 30 and the rotating shaft 60 rotate at a rotation speed of 1000 rpm.

[0058] In the present embodiment, an inner rotor type in which the rotor 30 is located inside the stator 20 is adopted as the rotating electrical machine 10. However, an outer rotor type in which the rotor 30 is located outside the stator 20 may be adopted as the rotating electrical machine 10. In addition, in the present embodiment, the rotating electrical machine 10 is a 12-pole 18-slot three-phase AC motor. However, for example, the number of poles, the number of slots, the number of phases, etc. may be appropriately changed.

[0059] The stator 20 includes a stator core (laminated core) 21 and a winding (not shown).

[0060] The stator core 21 of the embodiment is an integrated core. The stator core 21 includes an annular core back 22 and a plurality of teeth 23. Hereinafter, the axial direction (the direction of the central axis O of the stator core 21) of the stator core 21 (core back 22) is referred to as the axial direction, the radial direction (the direction orthogonal to the central axis O of the stator core 21) of the stator core 21 (core back 22) is referred to as the radial direction, and the circumferential direction (the direction surrounding the central axis O of the stator core 21) of the stator core 21 (core back 22) is referred to as the circumferential direction.

[0061] The core back 22 is formed in an annular shape in a plan view of the stator 20 viewed from the axial direction.

[0062] The plurality of teeth 23 protrude radially inward (radially toward the center axis O of the core back 22) from the core back 22. The plurality of teeth 23 are arranged at equal intervals in the circumferential direction. In the present embodiment, 18 teeth 23 are provided at a center angle of 20 degrees centered on the center axis O. The plurality of teeth 23 are formed into shapes and sizes that are equal to each other.

[0063] The winding is wound around the teeth 23. The winding may be concentratedly wound or distributedly wound.

[0064] 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 .

[0065] The rotor core 31 is formed in an annular shape (ring shape) arranged coaxially with the stator 20. The above-mentioned rotating shaft 60 is arranged in the rotor core 31. The rotating shaft 60 is fixed to the rotor core 31.

[0066] A plurality of permanent magnets 32 are fixed to the rotor core 31. In the present embodiment, a set of two permanent magnets 32 forms 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 (a total of 24) of permanent magnets 32 are provided at a central angle of 30 degrees with the central axis O as the center.

[0067] In the present embodiment, an embedded magnet type motor is used as a permanent magnet field type motor. A plurality of through holes 33 are formed in the rotor core 31, which 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. The fixing of each permanent magnet 32 ​​to the rotor core 31 can be achieved, for example, by bonding the outer surface of the permanent magnet 32 ​​to the inner surface of the through hole 33 using an adhesive. In addition, as a permanent magnet field type motor, instead of an embedded magnet type motor, a surface magnet type motor can be used.

[0068] <Laminated core>

[0069] like Figure 3 As shown, the stator core 21 is a laminated core. The stator core 21 is formed by laminating a plurality of electromagnetic steel sheets 40. That is, the stator core 21 includes a plurality of electromagnetic steel sheets 40 laminated in a thickness direction.

[0070] In addition, the stacking thickness of the stator core 21 is set to 50.0 mm, for example. The outer diameter of the stator core 21 is set to 250.0 mm, for example. The inner diameter of the stator core 21 is set to 165.0 mm, for example. However, these values ​​are only examples, and the stacking thickness, outer diameter or inner diameter of the stator core 21 is not limited to these values. Here, the inner diameter of the stator core 21 is based on the front end of the tooth portion 23 in the stator core 21. The inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the front end of all the tooth portions 23.

[0071] Each electromagnetic steel sheet 40 forming the stator core 21 is formed, for example, by punching a rolled plate-shaped base material. As the electromagnetic steel sheet 40, a known electromagnetic steel sheet can be used. The chemical composition of the electromagnetic steel sheet 40 is not particularly limited. In the present embodiment, a non-oriented electromagnetic steel sheet is used as the electromagnetic steel sheet 40. As the non-oriented electromagnetic steel sheet, for example, a non-oriented electrical steel strip of JIS C2552:2014 can be used.

[0072] However, a oriented electromagnetic steel sheet may be used instead of a non-oriented electromagnetic steel sheet as the electromagnetic steel sheet 40. As the oriented electromagnetic steel sheet, for example, a oriented electrical steel strip of JIS C2553:2012 may be used.

[0073] Regarding the non-oriented electrical steel strip, the maximum value of the anisotropy of the iron loss is less than the threshold value specified in JIS, and the iron loss does not have a significant orientation. However, since the non-oriented electrical steel strip is a rolled plate, it has an orientation of the iron loss below the threshold value specified in JIS along the rolling direction. Similarly, regarding the oriented electromagnetic steel strip, the iron loss is the smallest in the rolling direction. Therefore, the iron loss in the rolling direction of the non-oriented electrical steel strip and the oriented electrical steel strip is smaller than that in other directions.

[0074] In this embodiment, the rolling directions of the plurality of electromagnetic steel sheets 40 forming the stator core 21 coincide with each other. As described above, the electromagnetic steel sheets 40 have the smallest iron loss in the rolling direction. Therefore, the stator core 21 has the best magnetic properties in the rolling direction of the electromagnetic steel sheets 40.

[0075] In order to improve the workability of the electromagnetic steel sheet and the iron loss of the laminated core, an insulating film is provided on both sides of the electromagnetic steel sheet 40. As a material constituting the insulating film, the following materials can be used: (1) an inorganic compound, (2) an organic resin, and (3) a mixture of an inorganic compound and an organic resin. As an inorganic compound, for example, the following materials can be cited: (1) a complex of dichromate and boric acid, and (2) a complex of phosphate and silicon dioxide. As an organic resin, epoxy resin, acrylic resin, acrylic styrene resin, polyester resin, silicon resin, and fluorine resin can be cited.

[0076] In order to ensure the insulation performance between the electromagnetic steel sheets 40 stacked on each other, the thickness of the insulating film (the thickness per one side of the electromagnetic steel sheet 40 ) is preferably set to 0.1 μm or more.

[0077] On the other hand, as the insulating film becomes thicker, the insulating effect is saturated. In addition, as the insulating film becomes thicker, the proportion of the insulating film in the stator core 21 increases, and the magnetic properties of the stator core 21 decrease. Therefore, the insulating film can be thinner within a range that can ensure the insulation performance. The thickness of the insulating film (the thickness of each single-sided 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.

[0078] As the electromagnetic steel sheet 40 becomes thinner, the improvement effect of iron loss gradually saturates. In addition, as the electromagnetic steel sheet 40 becomes thinner, the manufacturing cost of the electromagnetic steel sheet 40 increases. Therefore, considering the improvement effect of iron loss and the manufacturing cost, it is preferred that the thickness of the electromagnetic steel sheet 40 be set to 0.10 mm or more.

[0079] On the other hand, when the electromagnetic steel sheet 40 is too thick, it becomes difficult to perform press punching of the electromagnetic steel sheet 40. Therefore, in consideration of the press punching of the electromagnetic steel sheet 40, the thickness of the electromagnetic steel sheet 40 is preferably set to 0.65 mm or less.

[0080] In addition, when the electromagnetic steel sheet 40 becomes thicker, the iron loss increases. Therefore, considering the iron loss characteristics of the electromagnetic steel sheet 40, the thickness of the electromagnetic steel sheet 40 is preferably set to 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm.

[0081] Considering the above point, the thickness of each electromagnetic steel sheet 40 is, for example, 0.10 mm to 0.65 mm, preferably 0.10 mm to 0.35 mm, and more preferably 0.20 mm or 0.25 mm. The thickness of the electromagnetic steel sheet 40 also includes the thickness of the insulating film.

[0082] The plurality of electromagnetic steel sheets 40 forming the stator core 21 are bonded by bonding portions 41. The bonding portions 41 are adhesives that are provided between the electromagnetic steel sheets 40 adjacent to each other in the stacking direction and are cured without being divided. For the adhesive, for example, a thermosetting adhesive that is polymerized and bonded is used. As the adhesive composition, (1) acrylic resin, (2) epoxy resin, and (3) a composition containing acrylic resin and epoxy resin can be used. As such an adhesive, in addition to a thermosetting adhesive, a radical polymerization adhesive can also be used. From the viewpoint of productivity, a room temperature curing adhesive is preferably used. A room temperature curing adhesive cures at 20°C to 30°C. As a room temperature curing adhesive, an acrylic adhesive is preferred. Representative acrylic adhesives include SGA (Second Generation Acrylic Adhesive). Anaerobic adhesives, instant adhesives, and acrylic adhesives containing elastomers can all be used within the scope of not impairing the effects of the present invention. In addition, the adhesive mentioned here refers to the state before curing, and after the adhesive is cured, it will become the bonding portion 41.

[0083] The average tensile modulus E of the bonding portion 41 at room temperature (20°C to 30°C) is set within the range of 1500MPa to 4500MPa. Regarding the average tensile modulus E of the bonding portion 41, when it is less than 1500MPa, there will be a defect that the rigidity of the laminated core is reduced. Therefore, the lower limit value of the average tensile modulus E of the bonding portion 41 is set to 1500MPa, and more preferably, it is set to 1800MPa. On the contrary, when the average tensile modulus E of the bonding portion 41 exceeds 4500MPa, the following defect will occur: the insulating film formed on the surface of the electromagnetic steel sheet 40 is peeled off. Therefore, the upper limit value of the average tensile modulus E of the bonding portion 41 is set to 4500MPa, and more preferably, it is set to 3650MPa.

[0084] The average tensile modulus E was measured by a resonance method. Specifically, the tensile modulus was measured in accordance with JIS R1602:1995.

[0085] More specifically, first, a sample for measurement (not shown) is prepared. The sample is obtained by bonding two electromagnetic steel sheets 40 with an adhesive, which is the object of measurement, and curing the adhesive to form a bonding portion 41. When the adhesive is a thermosetting adhesive, the curing is performed by heating and pressing under heating and pressing conditions in actual operation. On the other hand, when the adhesive is a room temperature curing adhesive, the curing is performed by pressing at room temperature.

[0086] Then, the tensile modulus of elasticity of the sample is measured by the resonance method. The method for measuring the tensile modulus of elasticity by the resonance method is as described above, and is performed in accordance with JIS R1602: 1995. Then, the tensile modulus of elasticity of the bonding portion 41 alone is obtained by removing the influence of the electromagnetic steel sheet 40 itself from the tensile modulus of elasticity of the sample (measured value) by calculation.

[0087] The tensile modulus obtained from the sample in this way is equal to the average value of the entire laminated core, so this value is regarded as the average tensile modulus E. The components of the average tensile modulus E are set so that they hardly change at the stacking position along the stacking direction or the circumferential position around the central axis of the laminated core. Therefore, the average tensile modulus E can also be measured at the cured bonding portion 41 at the upper end of the laminated core.

[0088] The motor generates heat when it is driven. Therefore, when the melting point of the adhesive portion 41 is low, the adhesive portion 41 will melt due to the heat of the motor, so that the shape of the adhesive area 42 will change, and the desired effect cannot be obtained. Generally, an insulating coating (enamel) is provided on the surface of the winding wound on the stator core 21. The heat-resistant temperature of the coating is, for example, about 180°C. Therefore, a general motor is driven in a manner to be below 180°C. That is, the motor can be heated to about 180°C. In this embodiment, the melting point of the adhesive portion 41 is preferably above 180°C. Furthermore, considering the safety factor of the presence of a portion that may locally become high temperature, the melting point of the adhesive portion 41 is further preferably above 200°C.

[0089] As a bonding method, for example, a method of bonding by heating or pressing after applying an adhesive to the electromagnetic steel sheet 40 or both can be adopted. In addition, the heating means may be any means such as heating in a high temperature tank or electric furnace, or directly applying electricity.

[0090] In order to obtain stable and sufficient adhesive strength, the thickness of the adhesive portion 41 is preferably set to 1 μm or more.

[0091] On the other hand, when the thickness of the adhesive portion 41 exceeds 100 μm, the adhesive force will be saturated. In addition, as the adhesive portion 41 becomes thicker, the space factor will decrease, and the magnetic properties such as the iron loss of the laminated core will decrease. Therefore, it is preferred that the thickness of the adhesive portion 41 is set to be greater than 1 μm and less than 100 μm, and more preferably, to be greater than 1 μm and less than 10 μm.

[0092] In the above description, the thickness of the adhesive portion 41 means the average thickness of the adhesive portion 41 .

[0093] It is more preferable to set the average thickness of the bonding portion 41 to be greater than 1.0 μm and less than 3.0 μm. When the average thickness of the bonding portion 41 is less than 1.0 μm, as described above, sufficient bonding strength cannot be ensured. Therefore, the lower limit of the average thickness of the bonding portion 41 is set to 1.0 μm, and more preferably, it is set to 1.2 μm. On the contrary, when the average thickness of the bonding portion 41 exceeds 3.0 μm and becomes thicker, defects such as a significant increase in the amount of distortion of the electromagnetic steel sheet 40 due to shrinkage during thermal curing will occur. Therefore, the upper limit of the average thickness of the bonding portion 41 is set to 3.0 μm, and more preferably, it is set to 2.6 μm.

[0094] The average thickness of the bonding portion 41 is the average value of the entire laminated core. The average thickness of the bonding portion 41 hardly changes at the stacking position along the stacking direction or the circumferential position around the central axis of the laminated core. Therefore, the average thickness of the bonding portion 41 can be determined by the average value of the values ​​measured at the upper end position of the laminated core and at least 10 positions in the circumferential direction.

[0095] In addition, the average thickness of the bonding portion 41 can be adjusted by, for example, changing the amount of adhesive applied. In addition, the average tensile elastic modulus E of the bonding portion 41 can be adjusted by, for example, changing one or both of the heating and pressurizing conditions and the type of curing agent applied during bonding in the case of a thermosetting adhesive.

[0096] Next, based on Figure 4 , the relationship between the electromagnetic steel sheet 40 and the bonding portion 41 will be described.

[0097] In addition, in this specification, the direction in which the plurality of electromagnetic steel sheets 40 are stacked is simply referred to as a stacking direction. The stacking direction coincides with the thickness direction of the electromagnetic steel sheets 40. In addition, the stacking direction coincides with the direction in which the central axis O extends.

[0098] When viewed from the stacking direction, the plurality of bonding portions 41 are formed in a stripe shape as a whole. The electromagnetic steel sheets 40 adjacent to each other in the stacking direction are not all bonded to each other on their entire surfaces. The electromagnetic steel sheets 40 are all partially bonded to each other.

[0099] The plurality of adhesive portions 41 are formed in a strip shape along the first direction D1 when viewed from the stacking direction, and the adhesive portions 41 are arranged at equal intervals along the second direction D2. In other words, in the electromagnetic steel sheet 40, the surface facing the stacking direction (hereinafter referred to as the first surface of the electromagnetic steel sheet 40) includes: an adhesive region 42, which is provided with the adhesive portion 41; and a non-adhesive region 43 (blank region) which is not provided with the adhesive portion 41. In addition, the so-called adhesive region 42 of the electromagnetic steel sheet 40 provided with the adhesive portion 41 means a region on the first surface of the electromagnetic steel sheet 40 where the adhesive is not divided and cured. In addition, the so-called non-adhesive region 43 of the electromagnetic steel sheet 40 where the adhesive portion 41 is not provided means a region on the first surface of the electromagnetic steel sheet 40 where the adhesive is not divided and cured. The bonding portion 41 is formed in a strip shape extending in the first direction D1 and is arranged at equal intervals in the second direction D2. Therefore, the bonding area 42 and the non-bonding area 43 on the first surface of the electromagnetic steel sheet 40 are respectively formed in a strip shape extending in the first direction D1, and the bonding area 42 and the non-bonding area 43 are formed to be alternately arranged in the second direction D2.

[0100] In addition, the so-called first direction D1 corresponds to the direction in which the adhesive portion 41 formed in a strip shape extends, that is, the long side direction of the adhesive portion 41. In addition, the so-called second direction D2 corresponds to the short side direction of the adhesive portion 41 formed in a strip shape. In addition, the first direction D1 and the second direction D2 are orthogonal to each other. In addition, in this embodiment, it is assumed that the width dimension of the adhesive portion 41 and the gap dimension between the adhesive portions 41 are uniform.

[0101] In addition, in this specification, the "belt shape" which is the shape of the extended bonding portion 41 means a shape extending in one direction, and the width is 1.5% or more of the outer diameter of the stator core 21. Since the width of the bonding portion 41 is 1.5% or more of the outer diameter of the stator core 21, the bonding strength between the electromagnetic steel sheets 40 can be sufficiently ensured.

[0102] exist Figure 4 , the rolling direction RD of the electromagnetic steel sheet 40 is shown. In addition, the angle formed by the first direction D1 and the rolling direction RD of the electromagnetic steel sheet 40 is recorded as angle α. Generally, two angles of large and small are defined as the angle formed by two directions, but the angle α is the smaller of the two angles formed by the first direction D1 and the rolling direction RD. That is, in this specification, the angle α is an angle of 0° to 90°.

[0103] In the present embodiment, the adhesive shrinks when it cures. Therefore, as the adhesive cures, compressive stress is applied to the electromagnetic steel sheet 40, and the electromagnetic steel sheet 40 is distorted. When the electromagnetic steel sheet 40 is distorted, there is a risk that the value of the iron loss increases, and the magnetic properties of the stator core 21 are reduced.

[0104] In addition, in this specification, the increase in the value of iron loss may be referred to as "deterioration of iron loss".

[0105] When the bonding portion 41 is formed in a strip shape, the compressive stress applied to the electromagnetic steel sheet 40 becomes maximum in the direction (first direction D1) in which the bonding portion 41 extends.

[0106] The electromagnetic steel sheet 40 has the highest rigidity in the direction perpendicular to the rolling direction RD and is less likely to be distorted in response to the compressive stress. Therefore, distortion of the electromagnetic steel sheet 40 can be suppressed by making the angle α between the first direction D1 and the rolling direction RD close to 90°.

[0107] Furthermore, as described above, the iron loss of the electromagnetic steel sheet 40 is the smallest in the rolling direction RD, and when the rolling direction RD is distorted, the iron loss deteriorates most significantly. Therefore, when the first direction D1 coincides with the rolling direction RD of the electromagnetic steel sheet 40 (angle α=0°), the magnetic properties of the stator core 21 are most degraded. Therefore, the iron loss of the electromagnetic steel sheet 40 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD away from 0°.

[0108] In the present embodiment, the distortion of the electromagnetic steel sheet 40 can be suppressed and the degradation of the iron loss of the electromagnetic steel sheet 40 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD away from 0° and close to 90°. In the present embodiment, the angle α is preferably 30° or more and 90° or less. By setting the angle α to be 30° or more and making the first direction D1 intersect the rolling direction at an angle greater than a certain value, the influence of the compressive stress of the adhesive on the iron loss of the electromagnetic steel sheet 40 can be suppressed, and the distortion of the electromagnetic steel sheet 40 can be suppressed, and as a result, the magnetic properties of the stator core 21 can be fully ensured.

[0109] The iron loss of the electromagnetic steel sheet 40 is the largest in the direction inclined at a specific angle relative to the rolling direction RD. In this specification, the direction with the largest iron loss is referred to as the specific direction SD. The inventors have found that the specific direction SD of the electromagnetic steel sheet 40 is a direction inclined at 57.3° relative to the rolling direction RD. In addition, the specific direction SD in the present embodiment is a crystal orientation with Miller index {111}<112> in the cubic crystal which is the crystal structure of the electromagnetic steel sheet 40. Because the iron loss of the electromagnetic steel sheet 40 is originally large in the specific direction SD, even if distortion occurs along the specific direction SD, the degradation of the iron loss becomes relatively small. Therefore, by setting the direction close to the specific direction SD as the direction in which the distortion occurs, the degradation of the iron loss of the electromagnetic steel sheet 40 can be suppressed as a whole.

[0110] Here, the configuration for suppressing degradation of the iron loss of the electromagnetic steel sheet 40 will be summarized. The configuration for suppressing degradation of the iron loss of the electromagnetic steel sheet 40 due to the compressive stress of the adhesive mainly includes the following two configurations.

[0111] The first configuration is a configuration in which the first direction D1 is close to a direction perpendicular to the rolling direction RD of the electromagnetic steel sheet 40. In this configuration, degradation of iron loss is suppressed by suppressing the distortion of the electromagnetic steel sheet 40. That is, in the first configuration, the angle α is preferably close to 90°.

[0112] The second configuration is a configuration in which the first direction D1 is close to the unique direction SD of the electromagnetic steel sheet 40. In this configuration, degradation of the iron loss of the electromagnetic steel sheet 40 corresponding to the distortion is suppressed. That is, in the second configuration, the angle α is preferably close to 57.3°.

[0113] Regarding the iron loss of the electromagnetic steel sheet 40, the above two structures are used to suppress the deterioration caused by the compressive stress of the adhesive. Therefore, by setting the angle α to an angle between 57.3° and 90°, the effects of the above two structures can be enjoyed respectively. In addition, even if the angle α changes by about ±5°, the iron loss will not change significantly. Therefore, the angle α formed by the first direction D1 and the rolling direction RD is preferably greater than 52.3° and less than 90°. In addition, 57.3° can also be said to be about 60°. That is, it can also be said that in this embodiment, the angle α formed by the first direction D1 and the rolling direction RD is preferably greater than 60° and less than 90°.

[0114] like Figure 4As shown, the plurality of bonding portions 41 are formed in a strip shape with a width dimension d1 along the second direction D2 on the first surface of the electromagnetic steel sheet 40. In addition, a gap with a spacing dimension d2 is provided between two bonding portions 41 adjacent to each other in the second direction D2. The spacing dimension d2 is the width dimension of the non-bonding area 43. Here, the width dimension d1 of the bonding portion 41 is equivalent to the width dimension of the bonding area 42, and the spacing dimension d2 between the bonding portions 41 is equivalent to the width dimension of the non-bonding area 43.

[0115] The width dimension d1 of the bonding portion 41 is preferably set to be 5% or less relative to the outer diameter of the stator core 21. By setting the width dimension d1 to be 5% or less of the outer diameter of the stator core 21, it is possible to suppress degradation of the iron loss of the entire electromagnetic steel sheet 40 without causing significant local deformation of the electromagnetic steel sheet 40 due to the compressive stress of the adhesive.

[0116] The width dimension d1 of the bonding portion 41 is preferably smaller than the spacing dimension d2 between adjacent bonding portions 41 in the second direction D2 (d1<d2). In other words, the width dimension d1 is preferably smaller than 100% of the spacing dimension d2. As described above, the electromagnetic steel sheet 40 is distorted by the compressive stress of the adhesive, and the iron loss of the electromagnetic steel sheet 40 increases due to the distortion. According to the present embodiment, by making the width dimension d1 smaller than the spacing dimension d2, the distortion of the electromagnetic steel sheet 40 caused by the adhesive can be suppressed, and the magnetic properties of the stator core 21 can be ensured.

[0117] More preferably, the width dimension d1 of the bonding portion 41 is 67%±5% relative to the spacing dimension d2 between adjacent bonding portions 41. When the width dimension d1 is made too large relative to the spacing dimension d2, there is a risk that the distortion of the electromagnetic steel sheet 40 due to the compressive stress of the adhesive becomes larger. On the other hand, when the width dimension d1 is too small relative to the spacing dimension d2, there is a risk that the bonding strength between the electromagnetic steel sheets 40 is insufficient. According to the present embodiment, by setting the width dimension d1 to 67%±5% relative to the spacing dimension d2, it is possible to sufficiently ensure the bonding strength between the electromagnetic steel sheets 40, suppress the distortion of the electromagnetic steel sheets 40, and ensure the magnetic properties of the stator core 21.

[0118] When the width dimension d1 is 67%±5% relative to the interval dimension d2, the angle α between the first direction D1 and the rolling direction RD is preferably set to 75°±5°. This can more effectively suppress deterioration of the magnetic properties of the stator core 21.

[0119] Next, the case where the width dimension d1 of the bonding portion 41 is larger than the distance d2 between adjacent bonding portions 41 (d1>d2) will be described. By making the width dimension d1 of the bonding portion 41 larger than the distance d2, the bonding strength between the electromagnetic steel sheets 40 can be improved.

[0120] On the other hand, there is a risk that the electromagnetic steel sheet 40 may be deformed due to the compressive stress of the adhesive. Therefore, when the width dimension d1 of the adhesive portion 41 is larger than the spacing dimension d2, it is preferable to make the direction in which the adhesive portion 41 extends (the first direction D1) close to the direction with higher rigidity (the direction orthogonal to the rolling direction RD). More specifically, when the width dimension d1 of the adhesive portion 41 is larger than the spacing dimension d2, it is preferable to set the angle α formed by the first direction D1 and the rolling direction RD to be greater than 85°. In this way, the bonding force between the electromagnetic steel sheets 40 can be improved, the distortion of the electromagnetic steel sheets 40 can be suppressed, and the magnetic properties of the stator core 21 can be ensured.

[0121] In the present embodiment, the rolling directions RD of all the electromagnetic steel sheets 40 forming the stator core 21 are consistent with each other. However, the rolling directions RD of all the electromagnetic steel sheets 40 may not be consistent. For example, the stator core 21 may be formed by rotating and stacking the electromagnetic steel sheets 40. As an example, a stator core in which the electromagnetic steel sheets 40 are rotated and stacked is specifically described. In the rotated and stacked stator core, attention is paid to a layer of one bonding portion 41 and a group of electromagnetic steel sheets 40 sandwiching the layer. The rolling directions RD of the group of electromagnetic steel sheets 40 sandwiching the layer of the bonding portion 41 are different from each other. In this case, with respect to the first direction D1, the angle α formed with the rolling direction RD of the electromagnetic steel sheet 40 located on one side of the stacking direction is included in the above-mentioned preferred angle range, and the angle α formed with the rolling direction RD of the electromagnetic steel sheet 40 on the other side of the stacking direction is included in the above-mentioned preferred angle range. Furthermore, in the rotationally stacked stator core, the first directions D1 of the respective layers of the bonding portions 41 provided between the electromagnetic steel sheets 40 may be different from each other.

[0122] In the present embodiment, 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. In the present embodiment, the lamination thickness of the rotor core 31 is equal to that of the stator core 21, and is set to 50.0 mm, for example. The outer diameter of the rotor core 31 is set to 163.0 mm, for example. The inner diameter of the rotor core 31 is set to 30.0 mm, for example. However, these values ​​are only examples, and the lamination thickness, outer diameter or inner diameter of the rotor core 31 are not limited to these values.

[0123] In this embodiment, the plurality of electromagnetic steel sheets forming the rotor core 31 are connected by rivets C (pin: dowel; see Figure 1However, the plurality of electromagnetic steel sheets 40 forming the rotor core 31 may be bonded together by the same bonding portion as the stator core 21.

[0124] (Second embodiment)

[0125] Next, based on Figure 5 , Figure 6 , a rotating electrical machine 110 according to a second embodiment will be described.

[0126] like Figure 5 As shown, the rotating electrical machine 110 of the second embodiment includes the rotor 30 , the housing 50 , the rotating shaft 60 , and the stator 120 similar to those of the first embodiment.

[0127] The stator 120 includes a stator core (laminated core) 121 , a fastening ring 129 , and a winding (not shown).

[0128] The stator core 121 is a split core. Therefore, the stator core 121 has a plurality of core blocks (laminated cores) 124. The stator core 121 is formed by connecting a plurality of core blocks 124 in a ring shape. A fastening ring 129 is disposed radially outside the plurality of core blocks 124. The plurality of core blocks 124 are fixed to each other by being embedded in the fastening ring 129.

[0129] The configuration of the stator core 121 of the present embodiment is the same as that of the first embodiment in terms of the dimensions of each portion, except that the stator core is divided.

[0130] Next, the core blocks 124 will be described.

[0131] The core block 124 is one embodiment of a laminated core and includes an arc-shaped core back 122 extending in the circumferential direction and a tooth portion 123 .

[0132] The core back 122 is formed in an arc shape centered on the central axis O in a plan view of the stator 120 from the axial direction.

[0133] The teeth 123 protrude radially inward from the core back 122 (radially toward the center axis O of the core back 122). A plurality of core blocks 124 are arranged in a ring shape in the circumferential direction to constitute the stator core 121, so that a plurality of teeth 123 are arranged at equal intervals in the circumferential direction. In the stator 120 of the present embodiment, 18 teeth 123 are provided at intervals of 20 degrees with the center axis O as the center. The plurality of teeth 123 are formed in the same shape and size as each other.

[0134] The winding is wound around the teeth 123. The winding may be concentratedly wound or distributedly wound.

[0135] The core block 124 is constructed by stacking a plurality of electromagnetic steel sheets 140 in the axial direction, and the plurality of electromagnetic steel sheets 140 are formed by punching the electromagnetic steel sheets. That is, the core block 124 has a plurality of electromagnetic steel sheets 140 stacked on each other. Therefore, the stator core 121 is a laminated core. When viewed from the axial direction, the plurality of electromagnetic steel sheets 140 are each in a "T" shape.

[0136] Each electromagnetic steel plate piece 140 forming the core block 124 is formed by, for example, punching a rolled plate-shaped base material. As the electromagnetic steel plate piece 140, the same material as the electromagnetic steel plate of the first embodiment can be used.

[0137] The plurality of electromagnetic steel plate pieces 140 forming the core block 124 are bonded together by bonding portions 141. As the adhesive constituting the bonding portions 141 of the present embodiment, the same adhesive as that of the first embodiment is used.

[0138] Next, based on Figure 6 , the relationship between the electromagnetic steel sheet 140 and the bonding portion 141 is described. Figure 6 In FIG. 1 , the adhesive portion 141 is emphasized by a dot pattern.

[0139] The plurality of bonding portions 141 are formed in a stripe shape as a whole when viewed from the stacking direction. The electromagnetic steel sheet pieces 140 adjacent to each other in the stacking direction are not bonded to each other over their entire surfaces but are bonded to each other partially and fixed to each other.

[0140] The plurality of adhesive portions 141 are formed in a strip shape along the first direction D1 when viewed from the stacking direction, and the adhesive portions 141 are arranged at equal intervals along the second direction D2. In other words, in the electromagnetic steel sheet 140, the surface facing the stacking direction (hereinafter referred to as the first surface of the electromagnetic steel sheet 140) includes an adhesive region 142 provided with the adhesive portion 141 and a non-adhesive region 143 (blank region) not provided with the adhesive portion 141. In addition, the adhesive region 142 of the electromagnetic steel sheet 140 provided with the adhesive portion 141 means a region on the first surface of the electromagnetic steel sheet 140 where the adhesive is not divided and cured. In addition, the non-adhesive region 143 of the electromagnetic steel sheet 140 where the adhesive portion 141 is not provided means a region on the first surface of the electromagnetic steel sheet 140 where the adhesive is not divided and cured. The bonding portion 141 is formed into a strip extending in the first direction D1 and is arranged at equal intervals in the second direction D2. Therefore, the bonding area 142 and the non-bonding area 143 on the first surface of the electromagnetic steel sheet 140 are respectively formed into a strip extending in the first direction D1, and the bonding area 142 and the non-bonding area 143 are formed to be alternately arranged in the second direction D2.

[0141] In the core block 124 of the present embodiment, the rolling direction RD of the electromagnetic steel sheet 140 is approximately parallel to the direction in which the tooth portion 123 extends. That is, the tooth portion 123 extends along the rolling direction RD. The electromagnetic steel sheet 140 has the smallest iron loss in the rolling direction RD. Since the magnetic flux flows along the extension direction of the tooth portion 123 on the tooth portion 123, the magnetic properties of the core block 124 can be improved by making the rolling direction RD approximately parallel to the direction in which the tooth portion 123 extends. In addition, here, the so-called "extending along..." and "approximately parallel" refer to the case of parallel extension within a range of ±5° in addition to the strictly parallel case. That is, in the present embodiment, the angle between the direction in which the tooth portion 123 extends and the rolling direction RD is within 5°.

[0142] exist Figure 6 , the angle α formed by the first direction D1 and the rolling direction RD of the electromagnetic steel sheet 140 is shown. As in the above-mentioned embodiment, the electromagnetic steel sheet 140 has the highest rigidity in the direction perpendicular to the rolling direction RD, and is less likely to be distorted in response to the compressive stress. Therefore, the distortion of the electromagnetic steel sheet 140 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD close to 90°.

[0143] Furthermore, as described above, the iron loss of the electromagnetic steel sheet 140 is the smallest in the rolling direction RD, and when the rolling direction RD is distorted, the iron loss deteriorates most significantly. Therefore, when the first direction D1 coincides with the rolling direction RD of the electromagnetic steel sheet 140 (angle α=0°), the magnetic properties of the core block 124 are most degraded. Therefore, the iron loss of the electromagnetic steel sheet 140 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD away from 0°.

[0144] In the present embodiment, by changing the angle α between the first direction D1 and the rolling direction RD from 0° to 90°, distortion of the electromagnetic steel sheet 140 can be suppressed, and degradation of the iron loss of the electromagnetic steel sheet 140 can be suppressed.

[0145] In the present embodiment, the angle α is preferably set to be greater than or equal to 45° and less than or equal to 90°. By setting the angle α to be greater than or equal to 45°, the first direction D1 intersects the rolling direction at a certain angle or greater, thereby suppressing the influence of the compressive stress of the adhesive on the iron loss of the electromagnetic steel sheet 140, and suppressing the distortion of the electromagnetic steel sheet 140, and as a result, the magnetic properties of the core block 124 can be fully ensured.

[0146] Since the iron loss of the electromagnetic steel sheet 140 is originally large in the specific direction SD, even when the distortion occurs in the specific direction SD, the degradation of the iron loss becomes relatively small. Therefore, by setting the direction close to the specific direction SD as the direction in which the distortion occurs, the degradation of the iron loss of the electromagnetic steel sheet 140 can be suppressed as a whole.

[0147] Here, the configuration for suppressing degradation of the iron loss of the electromagnetic steel sheet 140 is summarized. The configuration for suppressing degradation of the iron loss of the electromagnetic steel sheet 140 due to the compressive stress of the adhesive mainly includes the following two configurations.

[0148] The first configuration is a configuration in which the first direction D1 is close to a direction perpendicular to the rolling direction RD of the electromagnetic steel sheet 140. In this configuration, degradation of iron loss is suppressed by suppressing the distortion of the electromagnetic steel sheet 140. That is, in the first configuration, the angle α is preferably close to 90°.

[0149] The second configuration is a configuration in which the first direction D1 is close to the unique direction SD of the electromagnetic steel sheet 140. In this configuration, degradation of the iron loss of the electromagnetic steel sheet 140 corresponding to the distortion is suppressed. That is, in the second configuration, the angle α is preferably close to 57.3°.

[0150] Regarding the iron loss of the electromagnetic steel sheet 140, the degradation caused by the compressive stress of the adhesive is suppressed by the above two structures. Therefore, by setting the angle α to an angle between 57.3° and 90°, the effects of the above two structures can be enjoyed respectively. In addition, even if the angle α changes by about ±5°, the iron loss will not change significantly, so the angle α formed by the first direction D1 and the rolling direction RD is preferably greater than 52.3° and less than 90°. In addition, 57.3° can also be said to be about 60°, so it can also be said that in this embodiment, the angle α formed by the first direction D1 and the rolling direction RD is preferably greater than 60° and less than 90°.

[0151] The plurality of bonding portions 141 are formed in a strip shape with a width dimension d1 along the second direction D2 on the first surface of the electromagnetic steel sheet 140. In addition, a gap with a spacing dimension d2 is provided between two bonding portions 141 adjacent to each other in the second direction D2. The spacing dimension d2 is the width dimension of the non-bonding area 143. Here, the width dimension d1 of the bonding portion 141 is equivalent to the width dimension of the bonding area 142, and the spacing dimension d2 between the bonding portions 141 is equivalent to the width dimension of the non-bonding area 143.

[0152] It is preferable to set the width dimension d1 of the bonding portion 141 to be 5% or less of the outer diameter of the stator core 121. By setting the width dimension d1 to be 5% or less of the outer diameter of the stator core 121, it is possible to suppress the degradation of the iron loss of the entire electromagnetic steel sheet 140 without causing a large local deformation of the electromagnetic steel sheet 140 due to the compressive stress of the adhesive.

[0153] The width dimension d1 of the adhesive portion 141 is preferably smaller than the spacing dimension d2 in the second direction D2 between adjacent adhesive portions 141 (d1<d2). In other words, the width dimension d1 is preferably less than 100% relative to the spacing dimension d2. As described above, the electromagnetic steel sheet 140 is deformed due to the compressive stress of the adhesive, and the iron loss of the electromagnetic steel sheet 140 increases due to the distortion. According to this embodiment, by making the width dimension d1 smaller than the spacing dimension d2, the distortion of the electromagnetic steel sheet 140 caused by the adhesive can be suppressed, and the magnetic properties of the core block 124 can be ensured.

[0154] It is more preferable that the width dimension d1 of the adhesive portion 141 is less than 60% relative to the spacing dimension d2 between adjacent adhesive portions 141. This can more reliably suppress the distortion of the electromagnetic steel sheet 140 caused by the adhesive, thereby ensuring the magnetic properties of the core block 124. In addition, for the same reason, it is further preferable that the width dimension d1 of the adhesive portion 141 is less than 43% relative to the spacing dimension d2 between adjacent adhesive portions 141.

[0155] Next, the case where the width dimension d1 of the bonding portion 141 is larger than the distance d2 between adjacent bonding portions 141 (d1>d2) is described. By making the width dimension d1 of the bonding portion 141 larger than the distance d2, the bonding strength between the electromagnetic steel sheets 140 can be improved.

[0156] On the other hand, there is a risk that the electromagnetic steel sheet 140 may be deformed due to the compressive stress of the adhesive. Therefore, when the width dimension d1 of the adhesive portion 141 is larger than the spacing dimension d2, it is preferred that the direction in which the adhesive portion 141 extends (the first direction D1) is close to the direction with higher rigidity (the direction orthogonal to the rolling direction RD). More specifically, when the width dimension d1 of the adhesive portion 141 is larger than the spacing dimension d2, it is preferred that the angle α formed by the first direction D1 and the rolling direction RD is set to be greater than 85°. In this way, the bonding force between the electromagnetic steel sheets 140 can be improved, the distortion of the electromagnetic steel sheets 140 can be suppressed, and the magnetic properties of the core blocks 124 can be ensured.

[0157] Next, a method for manufacturing the core block 124 and the stator core 121 of the present embodiment will be described. The method for manufacturing the core block 124 mainly includes a first step and a second step.

[0158] First, as a first step, a plurality of T-shaped electromagnetic steel sheet pieces 140 are punched out from a rolled electromagnetic steel sheet. In the first step, the electromagnetic steel sheet pieces 140 are punched out so that the teeth extend in the rolling direction RD of the electromagnetic steel sheet.

[0159] Next, as a second step, a plurality of electromagnetic steel sheets 140 are stacked by providing bonding portions 141 between each other. In the second step, the plurality of bonding portions 141 are formed into strips extending in the first direction D1 when viewed from the stacking direction. In addition, the plurality of bonding portions 141 are arranged to be arranged in the second direction D2. Furthermore, the plurality of electromagnetic steel sheets 140 are stacked in such a manner that the angle formed by the first direction D1 and the rolling direction RD is 45° or more and 90° or less. Since the bonding portions 141 are cured, the plurality of electromagnetic steel sheets 140 are fixed to each other.

[0160] (Variation Example)

[0161] Next, based on Figure 7 , a modified bonding portion 241 that can be adopted in each of the above-mentioned embodiments will be described. In addition, the same reference numerals are attached to the same components as those in the above-mentioned embodiments, and the description thereof will be omitted.

[0162] As in the above-mentioned embodiment, a plurality of bonding portions 241 are provided between the electromagnetic steel sheets 40 (or electromagnetic steel sheet pieces 140) of this modification. Each bonding portion 241 is formed in a strip shape along the first direction D1 on the first surface of the electromagnetic steel sheet 40 when viewed from the stacking direction. In addition, the plurality of bonding portions 241 are arranged to be arranged at equal intervals along the second direction D2. Two bonding portions adjacent to each other in the second direction D2 are arranged to be separated by a spacing dimension d2.

[0163] The bonding portion 241 of this variant has a plurality of element bonding portions 241c arranged along the first direction D1. In this embodiment, the so-called element bonding portion 241c refers to a block of adhesive that is arranged in a plurality along the first direction D1 to constitute the bonding portion 241. The plurality of adhesives are of substantially the same shape as each other. In the first direction D1, adjacent element bonding portions 241c are connected to each other. When viewed from the stacking direction, each element bonding portion 241c is in a substantially elliptical shape with the first direction D1 as the major axis. Therefore, both ends of the bonding portion 241 in the width direction extend in a zigzag manner along the first direction D1. In addition to the substantially elliptical shape shown in this variant, the element bonding portion 241c may also be in a substantially circular shape, etc.

[0164] As shown in this modification, regarding the “adhesive portion extending in a strip shape” in this specification, both ends in the width direction do not necessarily need to be linear, and may be bent along the first direction D1.

[0165] The bonding portion 241 is centered on the center line CL parallel to the first direction D1 and extends along the center line CL. The bonding portion 241 is symmetrically centered on the center line CL.

[0166] As shown in this modification, when both ends of the width direction of the bonding portion 241 extend in a zigzag manner, the width dimension d1 of the bonding portion 241 can be defined as follows. That is, the width dimension d1 of the bonding portion 241 is defined by setting a virtual line VL that makes both ends of the width direction of the bonding portion 241 approximate to a straight line. The virtual line VL extends substantially parallel to the center line CL. A pair of virtual lines VL is a virtual straight line, and the virtual straight line is defined in the following manner: the area of ​​the region sandwiched by the pair of virtual lines VL is equal to the area of ​​the bonding portion 241 observed from the stacking direction.

[0167] In this modification, the width dimension d1 of the bonding portion 241 is the distance dimension along the second direction D2 between a pair of virtual lines VL. In this modification, the spacing dimension d2 is the distance dimension between the virtual lines VL of adjacent bonding portions 241 .

[0168] The adhesive portion 241 shown in this modification can achieve the same effect as the adhesive portion 41 in the above embodiment. This adhesive portion 241 is formed, for example, by applying adhesive from multiple dispensers to multiple locations of the electromagnetic steel sheet 40 in a dotted manner along the first direction D1, pressing the electromagnetic steel sheet 40 against another electromagnetic steel sheet 40, and compressing the adhesive between the two electromagnetic steel sheets 40. In this way, even if the width dimension of the adhesive portion 241 is uneven, the same effect as the above embodiment can be obtained.

[0169] In addition, the technical scope of the present invention is not limited to the above-mentioned embodiments and their modifications, and various changes can be made within the scope not departing from the gist of the present invention.

[0170] In the above-mentioned embodiments, the adhesive portion is provided in the entire area within the surface of the electromagnetic steel sheet 40 or the electromagnetic steel sheet piece 140. However, the adhesive portion may be provided partially within the surface of the electromagnetic steel sheet 40 or the electromagnetic steel sheet piece 140. As an example, a stripe-shaped adhesive portion may be provided only in the area overlapping with the core back of the electromagnetic steel sheet. In addition, a stripe-shaped adhesive portion may be provided only in the area overlapping with the tooth portion of the electromagnetic steel sheet.

[0171] The shape of the stator core is not limited to the form shown in the above embodiment. Specifically, the outer diameter and inner diameter of the stator core, the stacking thickness, the number of slots, the circumferential and radial dimension ratio of the teeth, and the radial dimension ratio of the teeth and the back of the core can be arbitrarily designed according to the desired characteristics of the rotating electrical machine.

[0172] In addition, in the core block 124 of the second embodiment, a convex shape may be provided on the end surface of one circumferential side of the core back 122, and a concave shape may be provided on the end surface of the other circumferential side. In this case, the positional deviation of the plurality of core blocks 124 when connected in the circumferential direction can be suppressed by inserting the convex shape into the concave shape. Furthermore, the core block may have two or more teeth with respect to one core back. Furthermore, the core back and the teeth may be separate core blocks.

[0173] In the rotors of the above embodiments, two permanent magnets 32 form one magnetic pole, but the present invention is not limited thereto. For example, one permanent magnet 32 ​​may form one magnetic pole, or three or more permanent magnets 32 may form one magnetic pole.

[0174] In the above-described embodiments, a permanent magnet field type motor is described as an example of a rotating electrical machine. However, the structure of the rotating electrical machine is not limited to the following examples, and various known structures not shown below may be employed.

[0175] In the above embodiments, a permanent magnet field type motor is used as an example of a synchronous motor, but the present invention is not limited thereto. For example, the rotating electrical machine may be a reluctance type motor or an electromagnetic field type motor (winding field type motor).

[0176] In the above-mentioned embodiments, a synchronous motor is described as an example of an AC motor, but the present invention is not limited to this. For example, the rotating electrical machine may be an induction motor.

[0177] In the above-mentioned embodiments, an AC motor is described as an example of a motor, but the present invention is not limited thereto. For example, the rotating electrical machine may be a DC motor.

[0178] In the above-mentioned embodiments, the electric motor is taken as an example of the rotating electrical machine, but the present invention is not limited thereto. For example, the rotating electrical machine may be a generator.

[0179] In the above-mentioned embodiments, the laminated core of the present invention is applied to a stator core, but it can also be applied to a rotor core. In addition, the laminated core of the present invention can also be applied to a laminated core other than a rotating electrical machine such as a transformer.

[0180] In addition, the components in the above-described embodiments may be appropriately replaced with well-known components without departing from the gist of the present invention, and the above-described modifications may be appropriately combined.

[0181] [Example]

[0182] Next, a verification test was performed to verify the above-mentioned effects. The verification test was performed by simulation using software. As the software, finite element method electromagnetic field analysis software JMAG manufactured by JSOL Corporation was used.

[0183] <First verification test>

[0184] First, as the first verification test, the integrated iron core illustrated as the first embodiment was verified. As the model used for the simulation, the stator iron core (laminated iron core) of the model No. A1 to model No. A22 described below was assumed. The electromagnetic steel sheet used in each model was a non-oriented electromagnetic steel sheet with a thickness of 0.25 mm. The shape of the electromagnetic steel sheet is Figure 2 The shapes shown are the same shape.

[0185] In the stator cores of Model No. A1 to Model No. A21, between the electromagnetic steel sheets, there are provided Figure 4 The stator core of model No.A22 has multiple bonding portions as shown. That is, in the stator cores of model No.A1 to model No.A21, multiple bonding portions extend in a strip shape along the first direction D1. On the other hand, in the stator core of model No.A22, bonding portions are provided between the electromagnetic steel sheets and on the entire surface of the first surface of the electromagnetic steel sheet. That is, the bonding portions of model No.A22 are provided on the entire surface of the first surface of the electromagnetic steel sheet. The stator core of model No.A22 is a model prepared in order to obtain a reference value of iron loss. Hereinafter, the stator core of model No.A22 is referred to as the "reference model".

[0186] The stator cores of models No. A1 to No. A7 are recorded as group A1 models. In group A1 models, the width dimension d1 of the bonding portion is 233% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of group A1 is 7 mm, and the spacing dimension d2 between the bonding portions is 3 mm.

[0187] The stator cores of models No. A8 to No. A14 are recorded as group A2 models. In group A2 models, the width dimension d1 of the bonding portion is 167% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of group A2 is 5 mm, and the spacing dimension d2 between the bonding portions is 3 mm.

[0188] The stator cores of models No. A15 to No. A21 are recorded as group A3 models. In group A3 models, the width dimension d1 of the bonding portion is 67% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of group A3 is 2 mm, and the spacing dimension d2 between the bonding portions is 3 mm.

[0189] In the A1 group, the A2 group, and the A3 group, an angle α (see Figure 4 ) is set to 0°, 15°, 30°, 45°, 60°, 75° and 90°.

[0190] For each model, the simulation results of the iron loss of the electromagnetic steel sheet are shown in Table 1. In addition, the iron loss of each model is expressed as a percentage based on the iron loss value of the benchmark model (stator core of model No. A22). In addition, Table 1 records the results of the drop test on a mock-up with the same bonding part as each model. In the drop test, each model was dropped 10 times from a height of 1m. Evaluation A means that no peeling of the bonding part occurred after 10 drops. In addition, evaluation A- means that no peeling of the bonding part occurred after 5 drops, but peeling occurred before 10 drops.

[0191]

Table 1

[0192]

[0193] By comparing the stator cores of Model No. A1 to Model No. A21, it was confirmed that even in the models belonging to any of the 1st to A3 groups, the iron loss can be suppressed by setting the angle α between the first direction D1 and the rolling direction RD to 30° or more. Furthermore, it was confirmed that the iron loss can be further suppressed by setting the angle α to 60° or more.

[0194] Comparing the A1 group, the A2 group, and the A3 group, the A3 group model has the smallest iron loss. For the A3 group model, the width dimension d1 is 67% relative to the spacing dimension d2. That is, for the A3 group model, the width dimension d1 is smaller than the spacing dimension d2. Therefore, it is believed that the distortion of the electromagnetic steel sheet 40 caused by the adhesive can be suppressed and the magnetic properties of the stator core 21 can be ensured. In addition, it was confirmed that when the width dimension d1 is set to 67% relative to the spacing dimension d2, the degradation of the iron loss of the electromagnetic steel sheet 40 can be suppressed. Even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%, the iron loss does not change significantly. Therefore, it can be said that even when the width dimension d1 is set to 67%±5% relative to the spacing dimension d2, the degradation of the iron loss of the electromagnetic steel sheet 40 can be suppressed.

[0195] In the A3 group, each model is compared, and the stator core iron loss of model No. A20, in which the angle α between the first direction D1 and the rolling direction RD is set to 75°, is the smallest. That is, it can be confirmed that when the width dimension d1 is 67% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to 75°. In addition, with regard to the angle α, the iron loss does not change much even when it changes by about ±5°. In addition, even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 67%±5% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to 75°±5°.

[0196] Regarding the A2 group model, the width dimension d1 is 167% relative to the spacing dimension d2. In the A2 group, the models are compared, and the stator core iron loss of model No. A14, in which the angle α between the first direction D1 and the rolling direction RD is set to 90°, is the smallest. That is, it can be confirmed that: when the width dimension d1 is 167% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to 90°. As mentioned above, with respect to the angle α, there is no significant change in the iron loss even when it changes by about ±5°. In addition, there is no significant change in the iron loss even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%. Therefore, it can be said that when the width dimension d1 is 167% ± 5% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to be greater than 85°.

[0197] For the A1 group model, the width dimension d1 is 233% relative to the spacing dimension d2. In the A1 group, the models are compared, and the stator core iron loss of model No. A7, in which the angle α between the first direction D1 and the rolling direction RD is set to 90°, is the smallest. That is, it can be confirmed that: when the width dimension d1 is 233% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to 90°. As mentioned above, with respect to the angle α, there is no significant change in the iron loss even when it changes by about ±5°. In addition, there is no significant change in the iron loss even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%. Therefore, it can be said that when the width dimension d1 is 233%±5% relative to the spacing dimension d2, the degradation of the iron loss can be suppressed to the maximum by setting the angle α to be greater than 85°.

[0198] As shown in Table 1, the A1 and A2 group solid models have superior drop strength compared to the A3 group solid model. In the A1 and A2 group solid models, the width dimension d1 of the bonding portion is larger than the spacing dimension d2, and in the A3 group solid model, the width dimension d1 of the bonding portion is smaller than the spacing dimension d2. This confirms that the bonding strength can be improved when the width dimension d1 of the bonding portion is larger than the spacing dimension d2 between adjacent bonding portions in the second direction D2.

[0199] Next, in addition to the above-mentioned models No.A1 to A21, simulations were also conducted for models in which the width dimension d1 / interval dimension d2 and the angle α were changed in a wide range. More specifically, simulation models were prepared in which the width dimension d1 / interval dimension d2 was changed to 0%, 50%, 67%, 100%, 150%, 167%, 200%, 233%, 250%, 300%, 350%, 400%, 450%, and 500%, respectively, and the angle α was changed to 0°, 15°, 30°, 45°, 60°, 75°, and 90°, respectively, and the iron loss was calculated respectively. Furthermore, based on these simulation results, the threshold value at which the iron loss would be improved was verified for the reference model No.A22 as the prior art.

[0200] Figure 8 The graph is a graph that uses the width dimension d1 / interval dimension d2 as the horizontal axis and the angle α as the vertical axis, and uses the grayscale to represent the iron loss ratio relative to the reference model No. 22. Figure 8 In the figure, the area with a lighter grayscale concentration means that the iron loss is improved compared with the reference model No. A22 (that is, the iron loss ratio is 100% or less).

[0201] like Figure 8 As shown, when the width dimension d1 / interval dimension d2 is 368% or less, the iron loss can be improved relative to the reference model No. A22 of the prior art regardless of the angle α. That is, it was confirmed that the width dimension d1 of the bonding portion is 368% or less relative to the interval dimension d2 in the second direction D2 between adjacent bonding portions. The smaller the width dimension d1 / interval dimension d2, the more the iron loss will be improved, preferably 233% or less, more preferably 167% or less, and further preferably 67% or less.

[0202] <Second verification test>

[0203] Next, as a second verification test, verification was performed on the split core illustrated as the second embodiment.

[0204] As the model used for the simulation, the stator core (laminated core) of the model No. B1 to model No. B21 described below is assumed. The stator core of the model No. B1 to model No. B21 has a plurality of core blocks connected in the circumferential direction. The core block of each stator core is composed of non-oriented electromagnetic steel sheets with a thickness of 0.25 mm. The shape of the electromagnetic steel sheet is similar to Figure 6 The same shape is shown, and the rolling direction RD of the electromagnetic steel sheet is consistent with the direction in which the teeth extend.

[0205] In the core blocks of Model No. B1 to Model No. B21, between the electromagnetic steel sheets, there are provided Figure 6 That is, in the core blocks of model No. B1 to model No. B21, the plurality of bonding portions extend in a belt shape along the first direction D1.

[0206] The stator cores of models No. B1 to No. B7 are recorded as the B1 group models. In the B1 group models, the width dimension d1 of the bonding portion is 150% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of the B1 group is 3 mm, and the spacing dimension d2 between the bonding portions is 2 mm. In the B1 group, the angle α (refer to Figure 6 ) are 0°, 15°, 30°, 45°, 60°, 75° and 90° and are recorded as models No.B1 to No.B7.

[0207] The stator cores of models No. B8 to No. B14 are recorded as the B2 group models. In the B2 group models, the width dimension d1 of the bonding portion is 60% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of the B2 group is 3 mm, and the spacing dimension d2 between the bonding portions is 5 mm. In the B2 group, the angle α (refer to Figure 6 ) are 0°, 15°, 30°, 45°, 60°, 75° and 90° and are recorded as models No. B8 to No. B14.

[0208] The stator cores of models No. B15 to No. B21 are recorded as the B3 group models. In the B3 group models, the width dimension d1 of the bonding portion is 43% of the spacing dimension d2 between adjacent bonding portions. The width dimension d1 of the bonding portion of each model of the B3 group is 3 mm, and the spacing dimension d2 between the bonding portions is 7 mm. In the B3 group, the angle α (refer to Figure 6 ) are 0°, 15°, 30°, 45°, 60°, 75° and 90° and are recorded as models No. B15 to No. B21.

[0209] In addition, as a comparison object, Fig. 9 As shown, the iron loss of the stator core 121X of model No. B22 in which a plurality of non-oriented electromagnetic steel sheets 140 are riveted throughout the layer is also obtained. The stator core 121X of model No. B22 is a model prepared to compare the iron loss of the existing structure with that of the present invention. Hereinafter, the stator core of model No. B22 is referred to as the "reference model". The stator core 121X of the reference model has a plurality of core blocks 124X. The stator core 121X of the reference model is also the same, the thickness of the electromagnetic steel sheet 140 is 0.25 mm, and the rolling direction RD of the electromagnetic steel sheet is consistent with the direction in which the tooth portion extends. In the core blocks of the stator core 121X of the reference model, a first rivet C1 and two second rivets C2 are respectively provided, the first rivet C1 being provided on the core back 122, and the second rivet C2 being provided on the tooth portion 123. The first rivet C1 is located at the circumferential center of the core back 122. Two second rivets C2 are radially arranged at the circumferential center of the teeth 123. The ratio of the area occupied by the rivets C1 and C2 on the first surface of the electromagnetic steel sheet 140 is about 3.2%.

[0210] The simulation results of the iron loss of the electromagnetic steel sheet for each model are shown in Table 2. In addition, Table 2 records the results of the drop test for the solid model provided with the same bonding portion as each model. The drop test was performed in the same order as the first verification test described above. In addition, the evaluation criteria of the drop test in this test are also the same as those of the first verification test.

[0211] The iron loss suppression rate Rt shown in Table 2 is a value obtained by dividing the difference between the iron loss of each model and the iron loss of the reference model (stator core of model No. B22) by the iron loss of the reference model as a percentage. That is, when the iron loss of each model is represented by W and the iron loss of the reference model is represented by Worg, the iron loss suppression rate in the table is represented by the following formula (1).

[0212] [Formula 1]

[0213]

[0214]

Table 2

[0215]

[0216] By comparing the stator cores of Model No. B1 to Model No. B21, it was confirmed that in any of the models belonging to Groups 1 to B3, the iron loss can be sufficiently suppressed (the iron loss suppression rate Rt can be suppressed to below -7.8%) by setting the angle α between the first direction D1 and the rolling direction RD to 45° or more. Furthermore, it was confirmed that the iron loss can be further suppressed (the iron loss suppression rate Rt can be suppressed to below -7.9%) by setting the angle α to 60° or more.

[0217] Comparing the B1 group, the B2 group, and the B3 group, the iron loss of the B2 group model is smaller than that of the B1 group model, and further, the iron loss of the B3 group model is the smallest. In the B2 group and the B3 group models, the width dimension d1 is smaller than the spacing dimension d2. Therefore, it is considered that the distortion of the electromagnetic steel sheet 140 caused by the adhesive can be suppressed and the magnetic properties of the stator core 121 can be ensured. The width dimension d1 of the B2 group model is 60% relative to the spacing dimension d2, and in the B3 group model, the width dimension d1 is 43% relative to the spacing dimension d2. That is, the ratio of the spacing dimension d2 to the width dimension d1 is smaller in the B3 group model than in the B2 group model. In the B3 group model, it was confirmed that the degradation of the iron loss of the electromagnetic steel sheet 140 can be more effectively suppressed compared with the B2 group model. That is, it was confirmed through this verification test that the iron loss can be suppressed by setting the width dimension d1 to 60% or less with respect to the interval dimension d2, and that the iron loss can be further suppressed by setting it to 43% or less.

[0218] Since the ratio of the width dimension d1 to the spacing dimension d2 is different for each of the B1, B2, and B3 groups, the preferred range of the angle α is different. The iron loss suppression rate Rt in Table 2 is preferably set to -8% or less as a reference.

[0219] For the B1 group model, the width dimension d1 is 150% relative to the spacing dimension d2. In the B1 group, the models are compared, and the iron loss of the stator core of the model No. B7, in which only the angle α between the first direction D1 and the rolling direction RD is set to 90°, is less than -8%. That is, it can be confirmed that: when the width dimension d1 is 150% relative to the spacing dimension d2, the degradation of the iron loss can be most fully suppressed by setting the angle α to 90°. In addition, with respect to the angle α, there is no significant change in the iron loss even when it changes by about ±5°. In addition, there is no significant change in the iron loss even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%. Therefore, it can be said that when the width dimension d1 is 150%±5% relative to the spacing dimension d2, the degradation of the iron loss can be fully suppressed by setting the angle α to more than 85°.

[0220] In the B2 group model, the width dimension d1 is 60% relative to the spacing dimension d2. In the B2 group, the models are compared. In the stator cores of the models No. B12, 13, and 14, in which the angle α between the first direction D1 and the rolling direction RD is 60° or more, the iron loss is less than -8%. That is, it can be confirmed that: when the width dimension d1 is 60% relative to the spacing dimension d2, the degradation of the iron loss can be fully suppressed by setting the angle α to be greater than 60°. As mentioned above, even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%, the iron loss does not change significantly. Therefore, it can be said that: when the width dimension d1 is 60%±5% relative to the spacing dimension d2, the degradation of the iron loss can be most fully suppressed by setting the angle α to be greater than 60°.

[0221] In the B3 group model, the width dimension d1 is 43% relative to the spacing dimension d2. In the B3 group, the models are compared. In the stator cores of models No. B18, 19, 20, and 21, in which the angle α between the first direction D1 and the rolling direction RD is 45° or more, the iron loss is less than -8%. That is, it can be confirmed that: when the width dimension d1 is 43% relative to the spacing dimension d2, the degradation of the iron loss can be fully suppressed by setting the angle α to 45° or more. As mentioned above, even when the ratio of the width dimension d1 to the spacing dimension d2 changes by about ±5%, the iron loss does not change significantly. Therefore, it can be said that: when the width dimension d1 is 43%±5% relative to the spacing dimension d2, the degradation of the iron loss can be most fully suppressed by setting the angle α to 60° or more.

[0222] As shown in Table 2, the B1 group solid model has superior drop strength compared to the B2 group and the B3 group solid models. In the B1 group solid model, the width dimension d1 of the bonding portion is larger than the spacing dimension d2, and in the B2 group and the B3 group solid models, the width dimension d1 of the bonding portion is smaller than the spacing dimension d2. This confirms that in the split core, even when the width dimension d1 of the bonding portion is larger than the spacing dimension d2 between adjacent bonding portions in the second direction D2, the bonding strength can be improved.

[0223] Industrial Availability

[0224] According to the present invention, magnetic properties can be improved, and therefore, the industrial applicability is high.

[0225] Description of Reference Numerals

[0226] 10, 110...rotating motor, 21, 121...stator core (laminated core), 22, 122...core back, 23, 123...tooth portion, 40...electromagnetic steel plate, 41, 141, 241...adhesive portion, 124, 124X...core block, 140...electromagnetic steel plate, D1...first direction, D2...second direction, d1...width dimension, d2...interval dimension, RD...rolling direction, α...angle.

Claims

1. A laminated core comprising: a plurality of electromagnetic steel sheets which are stacked one on another, and a plurality of bonding portions provided between the electromagnetic steel sheets adjacent to each other in a stacking direction and bonding the electromagnetic steel sheets to each other; In the laminated core, Observed from the stacking direction, The plurality of adhesive portions are formed into strips each extending along the first direction; The plurality of adhesive portions are arranged to be aligned with each other along a second direction orthogonal to the first direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than or equal to 30° and less than 90°.

2. The laminated core according to claim 1, wherein: An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 52.3° or more.

3. The laminated core according to claim 1, wherein: The width dimension of the bonding portion is smaller than the distance dimension between adjacent bonding portions in the second direction.

4. The laminated core according to claim 3, wherein: The width dimension of the bonding portion is 67%±5% of the spacing dimension between adjacent bonding portions in the second direction.

5. The laminated core according to claim 4, wherein: An angle formed between the first direction and the rolling direction of the electromagnetic steel sheet is 75°±5°.

6. The laminated core according to claim 1, wherein: The width dimension of the bonding portion is larger than the distance between adjacent bonding portions in the second direction.

7. The laminated core according to claim 6, wherein: The width dimension of the bonding portion is 167%±5% relative to the spacing dimension between adjacent bonding portions in the second direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 85° or more.

8. The laminated core according to claim 6, wherein: The width dimension of the bonding portion is 233%±5% relative to the spacing dimension between adjacent bonding portions in the second direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 85° or more.

9. The laminated core according to claim 1, The width dimension of the bonding portion is 368% or less of a distance dimension between adjacent bonding portions in the second direction.

10. The laminated core according to claim 1, wherein: The average thickness of the bonding portion is 1.0 μm to 3.0 μm.

11. The laminated core according to claim 1, wherein: The average tensile elastic modulus E of the bonding portion is 1500 MPa to 4500 MPa.

12. The laminated core according to any one of claims 1 to 11, wherein: The bonding portion is a room temperature bonding type acrylic adhesive, and the acrylic adhesive includes SGA composed of an acrylic adhesive containing an elastomer.

13. A core block, which is formed into a laminated core by connecting a plurality of core blocks into a ring shape; The core block includes: a plurality of electromagnetic steel plate sheets which are stacked one on top of the other, and a plurality of bonding portions provided between the electromagnetic steel sheets adjacent to each other in a stacking direction, and bonding the electromagnetic steel sheets to each other; Observed from the stacking direction, The plurality of adhesive portions are formed into strips each extending along the first direction; The plurality of adhesive portions are arranged to be aligned with each other along a second direction orthogonal to the first direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is greater than or equal to 45° and less than 90°.

14. The core block according to claim 13, wherein: An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 52.3° or more.

15. The core block according to claim 13, comprising: An arc-shaped core back and a tooth portion, wherein the tooth portion protrudes from the core back in a radial direction of the core back; The teeth extend along the rolling direction.

16. The core block according to claim 13, wherein: The width dimension of the bonding portion is smaller than the distance dimension between adjacent bonding portions in the second direction.

17. The core block according to claim 16, wherein: The width dimension of the bonding portion is 60% or less with respect to the spacing dimension between the adjacent bonding portions in the second direction.

18. The core block according to claim 17, wherein: The width dimension of the bonding portion is 43% or less with respect to the spacing dimension between the adjacent bonding portions in the second direction.

19. The core block according to claim 17, wherein: The width dimension of the bonding portion is 43%±5% relative to the spacing dimension between adjacent bonding portions in the second direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 45° or more.

20. The core block according to claim 16, wherein: The width dimension of the bonding portion is 60%±5% of the spacing dimension between adjacent bonding portions in the second direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 60° or more.

21. The laminated core according to claim 13, wherein: The width dimension of the bonding portion is larger than the distance between adjacent bonding portions in the second direction.

22. The core block according to claim 21, wherein: The width dimension of the bonding portion is 150%±5% of the spacing dimension between adjacent bonding portions in the second direction; An angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 85° or more.

23. The core block according to claim 13, wherein: The average thickness of the bonding portion is 1.0 μm to 3.0 μm.

24. The core block according to claim 13, wherein: The average tensile elastic modulus E of the bonding portion is 1500 MPa to 4500 MPa.

25. The core block according to any one of claims 13 to 24, wherein: The bonding portion is a room temperature bonding type acrylic adhesive, and the acrylic adhesive includes SGA composed of an acrylic adhesive containing an elastomer.

26. A laminated core comprising a plurality of core blocks according to any one of claims 13 to 25 connected in a ring shape.

27. A rotating electric machine comprising the laminated core according to any one of claims 1 to 12 and 26.

28. A method for manufacturing a core block, comprising: The first step is to punch out a plurality of electromagnetic steel sheet pieces from the electromagnetic steel sheet, and A second step of providing bonding portions between the plurality of electromagnetic steel sheets and stacking them; In the first step, the electromagnetic steel sheet is punched so that the teeth extend in the rolling direction of the electromagnetic steel sheet; In the second step, the plurality of bonding portions are formed into strips each extending in the first direction when viewed from the stacking direction, and the plurality of bonding portions are arranged to be arranged in a second direction orthogonal to the first direction, and the plurality of electromagnetic steel sheets are stacked so that the angle formed by the first direction and the rolling direction is greater than 45° and less than 90°.

29. The method for manufacturing a core block according to claim 28, wherein: The width dimension of the bonding portion is smaller than the distance dimension between adjacent bonding portions in the second direction.

Images