EA041739B1 - PLATED CORE, CORE BLOCK, ELECTRIC MOTOR AND METHOD OF CORE BLOCK PRODUCTION - Google Patents

Description

The field of technology to which the invention belongs

The present invention relates to a laminated core, to a core block, to an electric motor, and to a method for manufacturing a core block.

The present application claims the priority of Japanese Patent Application No. 2018-235856 filed December 17, 2018, Japanese Patent Application No. 2018-235872 filed December 17, 2018, Japanese Patent Application No. 2019-118338 filed June 26, 2019, and Japanese Patent Application No. 2019-118339, filed June 26, 2019, the contents of which are hereby incorporated by reference.

Prerequisites for the creation of the invention

In the prior art, the laminated core described in Patent Document 1 below is known. In the laminated core, electrical steel sheets next to each other in the stacking direction are bonded by adhesive layers.

List of bibliographic references

Patent Documents.

Patent document 1.

Unexamined patent application (Japan), first publication number 2011-023523.

The essence of the invention

Problems solved by the invention.

There is room for improving the magnetic properties of the prior art laminated core.

The present invention has been made in view of the above circumstances, and the purpose of the present invention is to improve the magnetic properties of the laminated core.

Problem solver.

In order to solve the above problem, the present invention provides the following aspects.

(1) According to an aspect of the present invention, there is provided a laminated core including a plurality of electrical steel sheets stacked on top of each other; and a plurality of adhesive portions that are placed between the electrical steel sheets next to each other in the stacking direction and adhere the electrical steel sheets to each other, wherein, when viewed in the laying direction, the plurality of adhesive portions form a strip shape that extends in the first direction, a plurality the adhesive portions are arranged in a second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 30° or more and 90° or less.

(2) In the laminated core according to (1), the angle formed by the first direction and the rolling direction of the electrical steel sheet may be 52.3° or more.

(3) In the laminated core according to (1) or (2), the width dimension of the adhesive portion may be smaller than the spacing dimension between the adhesive portions next to each other in the second direction.

(4) In the laminated core according to (3), the width dimension of the adhesive portion may be 67±5% with respect to the spacing dimension between the adhesive portions next to each other in the second direction.

(5) In the laminated core according to (4), the angle formed by the first direction and the rolling direction of the electrical steel sheet may be 75±5°.

(6) In the laminated core according to (1) or (2), the width dimension of the adhesive portion may be larger than the spacing dimension between the adhesive portions next to each other in the second direction.

(7) In the laminated core according to (6), the width dimension of the adhesive portion can be 167±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and the angle formed by the first direction and the rolling direction of the electrical steel sheet, may be 85° or more.

(8) In the laminated core according to (6), the width dimension of the adhesive portion can be 233±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and the angle formed by the first direction and the rolling direction of the electrical steel sheet, may be 85° or more.

(9) According to an aspect of the present invention, there is provided a laminated core including a plurality of electrical steel sheets stacked on top of each other; and a plurality of adhesive portions that are placed between the electrical steel sheets next to each other in the stacking direction and adhere the electrical steel sheets to each other, wherein, when viewed in the laying direction, the plurality of adhesive portions form a strip shape that extends in the first direction, a plurality the adhesive portions are arranged in a second direction orthogonal to the first direction, and the width dimension of the adhesive portion is 368% or less relative to the size of the spacing between the adhesive portions next to each other in the second direction.

- 1 041739 (10) In the laminated core according to any of (1) to (9), the average thickness of the adhesive portions may be 1.0-3.0 µm.

(11) In the laminated core according to any of (1) to (10), the average tensile modulus E of the adhesive portions may be 1500-4500 MPa.

(12) In the laminated core according to any of (1) to (11), the adhesive portion may be an SGA-containing acrylic-based adhesive made from an elastomer-containing acrylic-based adhesive.

(13) According to an aspect of the present invention, there is provided a core block that constitutes a laminated core by interlocking a plurality of core blocks in an annular shape, including a plurality of electrical steel sheet lengths stacked on top of each other; and a plurality of adhesive portions that are placed between the pieces of electrical steel sheets next to each other in the laying direction and adhere the pieces of electrical steel sheets to each other, wherein, when viewed in the laying direction, the plurality of adhesive portions form a strip shape that extends in the first direction. , a plurality of adhesive portions are arranged in a second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the electrical steel cut is 45° or more and 90° or less.

(14) In the core block according to (13), the angle formed by the first direction and the rolling direction of the section of electrical steel sheet may be 52.3° or more.

(15) The core block according to (13) or (14) may include an arcuate core back portion and a toothed portion that protrudes from the core back portion in the radial direction of the core back portion, with the toothed portion extending in the rolling direction.

(16) In the core block according to any of (13) to (15), the width dimension of the adhesive portion may be smaller than the size of the spacing between the adhesive portions next to each other in the second direction.

(18) In the core block according to (17), the width dimension of the adhesive portion may be 60% or less relative to the size of the interval between the adhesive portions next to each other in the second direction.

(18) In the core block according to (17), the width dimension of the adhesive portion may be 43% or less relative to the size of the spacing between the adhesive portions next to each other in the second direction.

(19) In the core block according to (17), the size in width of the adhesive part can be 43±5% with respect to the size of the interval between the adhesive parts next to each other in the second direction, and the angle formed by the first direction and the rolling direction of the section of electrical steel sheet , may be 45° or more.

(20) In the core block according to (16), the width dimension of the adhesive portion may be 60±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and the angle formed by the first direction and the rolling direction of the electrical steel sheet cut , may be 60° or more.

(21) In the core block according to any of (13) to (15), the width dimension of the adhesive portion may be larger than the spacing dimension between the adhesive portions next to each other in the second direction.

(22) In the core block according to (21), the width dimension of the adhesive portion can be 150±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and the angle formed by the first direction and the rolling direction of the section of electrical steel sheet , may be 85° or more.

(23) In the core block according to any one of (13) to (22), the average thickness of the adhesive portions may be 1.0-3.0 µm.

(24) In the core block according to any of (13) to (23), the average tensile modulus E of the adhesive portions may be 1500-4500 MPa.

(25) In the core block according to any of (13) to (24), the adhesive portion may be a room temperature adhesive acrylic-based adhesive containing SGA made from an elastomer-containing acrylic-based adhesive.

(26) According to an aspect of the present invention, a laminated core formed by interlocking a plurality of core blocks according to any of (13) to (25) in an annular shape is provided.

(27) According to an aspect of the present invention, there is provided a motor including a laminated core according to any one of (1) to (12) and (26).

(28) According to an aspect of the present invention, there is provided a method for producing a core block, including: a first process in which a plurality of pieces of electrical steel sheets are punched out of an electrical steel sheet; and a second process in which a plurality of pieces of electrical steel sheet are stacked on top of each other with adhesive portions provided therebetween, wherein, in the first process, a piece of electrical steel sheet is punched out

- 2 041739 in such a way that the toothed portion extends in the rolling direction of the electrical steel sheet, wherein, in the second process, the plurality of adhesive portions form a strip shape that extends in the first direction when viewed in the laying direction, the plurality of adhesive portions are placed in the second direction, orthogonal to the first direction, and a plurality of pieces of electrical steel sheets are stacked on top of each other so that the angle formed by the first direction and the rolling direction is 45° or more and 90° or less.

(29) In the core block manufacturing method according to (28), the width dimension of the adhesive portion may be smaller than the spacing dimension between the adhesive portions next to each other in the second direction.

advantages of the invention.

According to the present invention, it is possible to improve the magnetic properties of the laminated core.

Brief description of the drawings

Fig. 1 is a sectional view of a motor of the first embodiment.

Fig. 2 is a plan view of a stator included in the electric motor of the first embodiment.

Fig. 3 is a front view of a stator included in the electric motor of the first embodiment.

Fig. 4 is a schematic view of electrical steel sheets and adhesive portions of the first embodiment.

Fig. 5 is a plan view of a motor according to the second embodiment.

Fig. 6 is a schematic view of electrical steel sheets and adhesive parts of the second embodiment.

Fig. 7 is a schematic view of the adhesive parts of the stator of the modified example.

Fig. 8 is a graph showing the ratio of the width dimension to the spacing dimension of the adhesive portions and the loss in steel with respect to the angle in the first proof test.

Fig. 9 is a plan view of a stator core of a reference model as a simulation target for steel loss in the second proof test, and is a plan view showing a state in which electrical steel sheets are attached and bonded.

Embodiments for carrying out the invention

Hereinafter, this document describes an electric motor according to an embodiment of the present invention with reference to the drawings. Here, in the present embodiment, as a motor, a motor, specifically, an AC motor, more specifically, a synchronous motor, and more specifically, a permanent magnet motor, is exemplarily illustrated. This type of electric motor is suitably used for an electric vehicle, for example.

First embodiment.

First, the motor 10 of the first embodiment will now be described with reference to FIG. 1-4.

As shown in FIG. 1 and 2, the electric motor 10 of the first embodiment includes a stator 20, a rotor 30, a casing 50, and a rotary shaft 60.

Stator 20 and rotor 30 are housed in housing 50. Stator 20 is attached to housing 50.

In the electric motor 10 of the present embodiment, for example, a drive current with an effective value of 10 A and a frequency of 100 Hz is applied to each phase of the stator 20, and the rotor 30 and the rotary shaft 60 rotate at a rotation speed of 1000 rpm, respectively.

In the present embodiment, an internal rotor motor in which the rotor 30 is positioned inside the stator 20 is used as the electric motor 10. However, an external rotor motor in which the rotor 30 is positioned outside the stator 20 can be used as the electric motor 10. In addition, in the present embodiment, the motor 10 is a three-phase AC motor with 12 poles and 18 slots. However, for example, the number of poles, the number of slots, the number of phases, etc. can be changed appropriately.

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

The stator core 21 of the present embodiment is an integrated core. The stator core 21 includes an annular core back portion 22 and a plurality of toothed portions 23. Hereinafter, the axial direction (direction of the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is referred to as the axial direction, and the radial direction (direction , orthogonal to the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is called the radial direction. The circumferential direction (circumferential direction around the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is called the circumferential direction.

The back portion 22 of the core is formed in an annular shape when viewed from above the stator 20 when viewed in the axial direction.

- 3 041739

A plurality of toothed portions 23 protrude from the core back portion 22 inward in the radial direction (towards the central axis O of the core back portion 22 in the radial direction). A plurality of toothed portions 23 are arranged at regular intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are arranged at 20° intervals of a central angle centered on the center axis O. A plurality of tooth portions 23 are formed to be of the same shape and size.

The winding is wound around the gear portion 23. The winding may be a concentrated winding or a distributed winding.

The rotor 30 is located in the stator 20 (stator core 21) in the radial direction. The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32.

The rotor core 31 is formed to have an annular shape (closed annular shape) disposed coaxially with the stator 20. The rotation shaft 60 is disposed in the rotor core 31. The rotation shaft 60 is attached to the core 31 of the rotor.

A plurality of permanent magnets 32 are attached to the rotor core 31. In the present embodiment, a set of two permanent magnets 32 form one magnetic pole. A plurality of sets of permanent magnets 32 are arranged at regular intervals in the circumferential direction. In the present embodiment, 12 sets (24 in total) of permanent magnets 32 are placed at 30° intervals of a central angle centered on the central axis O.

In the present embodiment, an internal permanent magnet motor is used as a permanent magnet excited motor. A plurality of through holes 33 that penetrate through the rotor core 31 in the axial direction are formed in the rotor core 31 . The plurality of through holes 33 are arranged to correspond to the plurality of permanent magnets 32. The permanent magnets 32, which are located in the respective through holes 33, are attached to the rotor core 31. The attachment of each permanent magnet 32 to the rotor core 31 can be realized, for example, by gluing the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive material. Here, the surface permanent magnet motor can be used as the permanent magnet motor instead of the internal permanent magnet motor.

Lined core.

As shown in FIG. 3, the stator core 21 is a laminated core. The stator core 21 is formed by stacking a plurality of electrical steel sheets 40 . Thus, the stator core 21 includes a plurality of electrical steel sheets 40 stacked on top of each other in the thickness direction.

Here, the stacking thickness of the stator core 21 is 50.0 mm, for example. The outer diameter of the stator core 21, for example, is 250.0 mm. The inner diameter of the stator core 21, for example, is 165.0 mm. However, these values are examples, and the stacking thickness, outer diameter, and inner diameter of the stator core 21 are not limited to these values. Here, the inner diameter of the stator core 21 is based on the top 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 tops of all toothed parts 23.

The electrical steel sheets 40 forming the stator core 21 are formed, for example, by punching a rolled base sheet. A known electrical steel sheet may be used as the electrical steel sheet 40 . The chemical composition of the electrical steel sheet 40 is not specifically limited. In the present embodiment, a grain-oriented electrical steel sheet is used as the electrical steel sheet 40 . For example, a non-grain-oriented electrical steel strip according to JIS C 2552:2014 can be used as a non-grain-oriented electrical steel sheet.

However, the grain-oriented electrical steel sheet can be used as the electrical steel sheet 40 instead of the non-grain-oriented electrical steel sheet. For example, a grain-oriented electrical steel strip according to JIS C 2553:2012 can be used as a grain-oriented electrical steel sheet.

An electrical steel strip without grain orientation has a maximum steel loss anisotropy value that is less than a threshold value set by JIS and does not have a significant grain orientation in steel loss. However, since the non-grain-oriented electrical steel strip is a rolled sheet, it has a steel loss grain orientation that is equal to or less than a threshold value set by JIS in the rolling direction. Similarly, the grain-oriented electrical steel strip has the lowest steel loss in the rolling direction. Hence,

- 4 041739 as a strip of electrical steel without grain-oriented structure, and a strip of electrical steel with grain-oriented structure have lower losses in the steel in the rolling direction than in other directions.

In the present embodiment, the rolling directions of the plurality of electrical steel sheets 40 forming the stator core 21 coincide with each other. As described above, the electrical steel sheet 40 has the smallest steel loss in the rolling direction. Therefore, the stator core 21 has the most excellent magnetic properties in the rolling direction of the electrical steel sheet 40 .

In order to improve the workability of the electrical steel sheet and the steel loss of the laminated core, an insulating coating is provided on both sides of the electrical steel sheet 40 . With respect to the substance constituting the insulating coating, for example, (1) an inorganic compound, (2) an organic resin, (3) a mixture of an inorganic compound and an organic resin, and the like can be applied. Examples of inorganic compounds include (1) a dichromate-boric acid complex, and (2) a phosphate-silica complex. Examples of organic resins include epoxy resin, acrylic resin, acrylic styrene resin, polyester resin, silicone resin, and fluorine resin.

In order to ensure insulating performance between the electrical steel sheets 40 stacked on top of each other, the thickness of the insulating coating (thickness per one side of the electrical steel sheet 40) is preferably 0.1 µm or more.

On the other hand, as the insulating coating becomes thicker, the insulating effect becomes saturated. In addition, as the insulating coating becomes thicker, the proportion of the insulating coating in the stator core 21 increases, and the magnetic properties of the stator core 21 deteriorate. Therefore, the insulating coating is preferably thin to such an extent that the performance of the insulation can be maintained. The thickness of the insulating coating (thickness per side of the electrical 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.

As the electrical steel sheet 40 becomes thinner, the steel loss improvement effect gradually saturates. In addition, as the electrical steel sheet 40 becomes thinner, the manufacturing cost for the electrical steel sheet 40 increases. Therefore, considering the steel loss improvement effect and production cost, the thickness of the electrical steel sheet 40 is preferably 0.10 mm or more.

On the other hand, when the electrical steel sheet 40 is too thick, it is difficult to carry out the punching operation for the electrical steel sheet 40. Therefore, considering the punching operation for the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.65 mm or less.

In addition, as the electrical steel sheet 40 becomes thick, the steel loss increases. Therefore, considering the steel loss characteristics of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.35 mm or less, and more preferably 0.20 or 0.25 mm.

Considering the above aspects, the thickness of each electrical steel sheet 40 is, for example, 0.10 mm or more and 0.65 mm or less, preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 or 0.25 mm. Here, the thickness of the electrical steel sheet 40 also includes the thickness of the insulating coating.

The plurality of electrical steel sheets 40 forming the stator core 21 are glued by adhesive portions 41. The adhesive portion 41 is an adhesive material that is provided between the electrical steel sheets 40 next to each other in the stacking direction and is cured without separation. With respect to the adhesive material, for example, a thermoset adhesive material using polymer bonding is used. With respect to the composition of the adhesive material, (1) acrylic resin, (2) epoxy resin, (3) a composition including acrylic resin and epoxy resin, and the like can be applied. As such an adhesive, in addition to the thermosetting adhesive, an adhesive based on radical polymerization can also be used. In terms of productivity, it is desirable to use a room temperature curing adhesive. The room temperature curing adhesive material cures at 20-30°C. With respect to a room temperature curing adhesive, an acrylic adhesive is preferred. Examples of typical acrylic adhesives include Second Generation Acrylic Adhesive (SGA). All of the anaerobic adhesive, the instant adhesive, and the elastomer-containing acrylic adhesive may be used provided that the benefits of the present invention are not compromised. The adhesive material referred to here is an uncured adhesive material, and after the adhesive material is cured, it becomes the adhesive portion 41.

Average tensile modulus E of adhesive part 41 at room temperature (20-5 041739

30°C) is in the range of 1500-4500 MPa. When the average tensile modulus E of the adhesive portion 41 is smaller than 1500 MPa, there is a problem of lowering the rigidity of the laminated core. Therefore, the lower limit value of the average tensile modulus E of the adhesive portion 41 is 1500 MPa, and more preferably 1800 MPa. On the other hand, when the average tensile modulus E of the adhesive portion 41 exceeds 4500 MPa, there is a problem of peeling off the insulating coating formed on the surface of the electrical steel sheet 40. Therefore, the upper limit value of the average tensile modulus E of the adhesive portion 41 is 4500 MPa, and more preferably 3650 MPa.

Here, the average tensile modulus E is measured by a resonance method. In particular, the tensile modulus is measured according to JIS R 1602:1995.

More specifically, first, a measurement sample (not shown) is formed. This pattern is obtained by bonding two electrical steel sheets 40 with an adhesive material to be measured and curing them so as to form an adhesive portion 41. When the adhesive material is thermosetting, this curing is performed by heating and pressurizing under conditions of heating and creating overpressure in the actual operation. On the other hand, when the adhesive material is a room temperature-curable adhesive material, curing is performed by pressurization at room temperature.

The tensile modulus of this sample is then measured by means of a resonance method. The method for measuring tensile modulus using the resonance method is performed according to JIS R 1602:1995 as described above. Then, the effect of the electrical steel sheet 40 itself is calculated and removed from the tensile modulus (measured value) of the sample to determine the tensile modulus of the adhesive portion 41 itself.

Since the tensile modulus determined from the sample in this way is equal to the average value of the laminated core as a whole, this numerical value is taken as the average tensile modulus E. The composition is set in such a way that the average tensile modulus E is almost identical at the laying position in the laying direction and at the position of the circumferential direction around the central axis of the laminated core. Therefore, the average tensile modulus E can be set to a numerical value obtained by performing a measurement on the cured adhesive portion 41 at the top end position of the laminated core.

The electric motor generates heat during actuation. Therefore, when the melting point of the adhesive portion 41 is low, the adhesive portion 41 melts due to the heat generated by the motor, the shape of the bonding region 42 changes, and the desired effect cannot be obtained. Typically, an insulating coating (enamel) is provided on the surface of the winding wound around the stator core 21. The heat resistant temperature of this coating, for example, is approximately 180°C. Therefore, the conventional motor is driven such that the temperature becomes 180° C. or lower. Thus, the motor can be heated up to approximately 180°C. In the present embodiment, the melting point of the adhesive portion 41 is preferably 180° C. or higher. In addition, in view of the safety factor considering the fact that there is a portion in which the temperature is locally high, the melting point of the adhesive portion 41 is more preferably 200° C. or higher.

With regard to the bonding method, for example, a method in which an adhesive material is applied to the electrical steel sheet 40 and bonding is then performed by one or both of heating and press-laying can be used. Here, as the heating method, any method can be used, such as heating in a high-temperature bath or an electric furnace, or direct application of electricity.

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

On the other hand, when the thickness of the adhesive portion 41 exceeds 100 µm, the adhesive force becomes maximum. In addition, as the adhesive portion 41 becomes thicker, the fill factor decreases and the magnetic properties such as loss in the laminated core steel deteriorate. Therefore, the thickness of the adhesive portion 41 is preferably 1 µm or more and 100 µm or less, and more preferably 1 µm or more and 10 µm or less.

Here, in the above description, the thickness of the adhesive portion 41 is the average thickness of the adhesive portions 41.

The average thickness of the adhesive portions 41 is more preferably 1.0 µm or more and 3.0 µm or less. When the average thickness of the adhesive portions 41 is less than 1.0 μm, sufficient adhesive strength cannot be ensured as described above. Therefore, the lower limit value of the average thickness of the adhesive parts 41 is 1.0 µm, and more preferably 1.2 µm. On the other hand, when the average thickness of the adhesive portions 41 exceeds 3.0 μm, there is a problem that the tension amount of the electrical steel sheet 40 increases significantly due to shrinkage during solidification.

- 6 041739

Therefore, the upper limit value of the average thickness of the adhesive portions 41 is 3.0 µm, and more preferably 2.6 µm.

The average thickness of the adhesive portions 41 is the average value of the laminated core as a whole. The average thickness of the adhesive portions 41 is almost identical in the laying position in the laying direction and in the position of the circumferential direction around the central axis of the laminated core. Therefore, the average thickness of the adhesive portions 41 may be set to the average of the numerical values measured at 10 or more points in the circumferential direction at the upper end position of the laminated core.

Here, the average thickness of the adhesive parts 41 can be adjusted, for example, by changing the amount of applied adhesive. In addition, for example, when the adhesive material is thermosetting, the average tensile modulus E of the adhesive portion 41 can be controlled by changing one or both of the heating and pressurization conditions applied during bonding and the type of curing agent.

Next, the relationship between the electrical steel sheet 40 and the adhesive portion 41 will be described with reference to FIG. 4.

Here, in this detailed description, the direction in which a plurality of electrical steel sheets 40 are stacked on top of each other is simply referred to as the stacking direction. The stacking direction is the same as the thickness direction of the electrical steel sheet 40 . In addition, the laying direction coincides with the direction in which the central axis O runs.

When viewed in the laying direction, a plurality of adhesive portions 41 are formed as a whole into a strip shape. All surfaces of the electrical steel sheets 40 next to each other in the laying direction are not fully adhered to each other. All of these electrical steel sheets 40 are locally bonded to each other.

When viewed in the laying direction, a plurality of adhesive portions 41 form a strip shape in the first direction D1, and adhesive portions 41 are placed at equal intervals in the second direction D2. In other words, the surface of the electrical steel sheet 40 facing the stacking direction (hereinafter referred to as the first surface of the electrical steel sheet 40) includes a bonding region 42 in which an adhesive portion 41 is provided, and a non-bonded region 43 (blank region) in where the adhesive portion 41 is not provided. Here, the bonding area 42 of the electrical steel sheet 40 in which the adhesive portion 41 is provided is the area of the first surface of the electrical steel sheet 40 in which the adhesive material cured without separation is provided. In addition, the non-adhesive region 43 of the electrical steel sheet 40 in which the adhesive portion 41 is not provided is a region of the first surface of the electrical steel sheet 40 in which no separation-curing adhesive is provided. The adhesive portions 41 form a strip shape that extends in the first direction D1 and are placed at equal intervals in the second direction D2. Therefore, the bonded area 42 and the non-bonded area 43 of the first surface of the electrical steel sheet 40 form a strip shape that extends in the first direction D1, and the bonded area 42 and the non-bonded area 43 are alternately formed in the second direction D2.

Here, the first direction D1 is the direction in which the adhesive portion 41 forming the strip shape extends and corresponds to the long side direction of the adhesive portion 41. In addition, the second direction D2 corresponds to the direction of the short side of the adhesive portion 41 forming the strip shape. In addition, the first direction D1 and the second direction D2 are orthogonal to each other. Here, in the present embodiment, a case is assumed in which the width dimensions of the adhesive portions 41 and the dimensions of the gaps between the adhesive portions 41 are uniform.

In addition, in this detailed description, the shape of the strip as the shape in which the adhesive portion 41 extends is a shape that extends in one direction, and means that the width is 1.5% or more of the outer diameter of the stator core 21. When the width of the adhesive portion 41 is 1.5% or more of the outer diameter of the stator core 21, sufficient adhesive strength between the electrical steel sheets 40 can be ensured.

In FIG. 4, the rolling direction RD of the electrical steel sheet 40 is shown. In addition, the angle formed by the first direction D1 and the rolling direction RD of the electrical steel sheet 40 is set as the angle a. Generally, the larger and smaller angles are defined as the angle formed by the two directions, and the angle α is the smaller angle between the two angles formed by the first rolling direction D1 and the rolling direction RD. Thus, in this detailed description, the angle α is an angle of 0° or more and 90° or less.

In the present embodiment, the adhesive shrinks during curing. Therefore, a compressive stress is applied to the electrical steel sheet 40 as the adhesive material is cured and tension is generated in the electrical steel sheet 40, respectively. When tension occurs in the electrical steel sheet 40, the steel loss value may increase, and the magnetic properties of the stator core 21 may deteriorate.

- 7 041739

Here in this detailed description, the increase in the iron loss value may be referred to as the worsening of the iron loss.

When the adhesive portions 41 form a strip shape, the compressive stress applied to the electrical steel sheet 40 becomes largest in the direction (in the first direction D1) in which the adhesive portion 41 extends.

The electrical steel sheet 40 has the greatest rigidity in a direction orthogonal to the rolling direction RD, and is hardly ever strained by compressive stress. Therefore, when the angle α formed by the first rolling direction D1 and the rolling direction RD is about 90°, the tension of the electrical steel sheet 40 can be minimized.

In addition, as described above, the steel loss of the electrical steel sheet 40 is smallest in the rolling direction RD. On the other hand, when tension occurs in the rolling direction RD, deterioration in steel loss becomes most significant. Therefore, when the first direction D1 coincides with the rolling direction RD of the electrical steel sheet 40 (angle α=0°), the magnetic properties of the stator core 21 deteriorate to the maximum extent. Therefore, when the angle α formed by the first rolling direction D1 and the rolling direction RD is a value very different from 0°, it is possible to minimize deterioration in steel loss of the electrical steel sheet 40 .

In the present embodiment, when the angle α formed by the first rolling direction D1 and the rolling direction RD is a value very different from 0° and close to 90°, it is possible to minimize the tension of the electrical steel sheet 40 and minimize the deterioration in steel loss of the electrical steel sheet 40 . In the present embodiment, the angle α is preferably 30° or more and 90° or less. When the angle α is set to 30° or more, and the first direction D1 intersects the rolling direction at a certain angle or more, the influence of the adhesive material compression stress on the steel loss of the electrical steel sheet 40 can be minimized, the tension of the electrical steel sheet 40 can be minimized, and as a result, sufficient magnetic properties of the stator core 21 can be ensured.

The electrical steel sheet 40 has the largest steel loss in a direction inclined at a specific angle with respect to the rolling direction RD. In this detailed description, the direction in which the iron loss is the largest is referred to as the specific direction SD. The inventors have found that the specific direction SD of the electrical steel sheet 40 is a direction inclined by 57.3° with respect to the rolling direction RD. Here, the specific SD direction in the present embodiment is the orientation of the {111}<112> Miller index crystals in the cubic crystal, which has the crystal structure of the electrical steel sheet 40. Since the electrical steel sheet 40 initially has a large steel loss in the specific SD direction, even if tension occurs in the specific SD direction, the deterioration in steel loss is relatively small. Therefore, when a direction close to the specific direction SD is set as the direction in which the tension occurs, it is possible to minimize deterioration in steel loss of the electrical steel sheet 40 as a whole.

Here, a configuration is summarized in which deterioration in the steel loss of the electrical steel sheet 40 is minimized. Mainly, the following two configurations are provided, in which the deterioration in steel loss of the electrical steel sheet 40 due to the compressive stress of the adhesive material is minimized.

The first configuration is a configuration in which the first direction D1 is closer to the direction orthogonal to the rolling direction RD of the electrical steel sheet 40 . In this configuration, self-tensioning of the electrical steel sheet 40 is prevented, and the deterioration of steel loss is minimized. Thus, in the first configuration, the angle α is preferably close to 90°.

The second configuration is a configuration in which the first direction D1 is closer to the specific direction SD of the electrical steel sheet 40 . In this configuration, deterioration in the steel loss of the electrical steel sheet 40 with respect to tension is minimized. Thus, in the second configuration, the angle α is preferably close to 57.3°.

The deterioration in steel loss of the electrical steel sheet 40 due to the compression stress of the adhesive material is minimized by the above two configurations. Therefore, when the angle α is set to an angle between 57.3 and 90°, the effects of the above two configurations can be exhibited. Here, even if the angle α changes by about ±5°, there is no significant change in steel loss. Therefore, the angle α formed by the first direction D1 and the rolling direction RD is preferably 52.3° or more and 90° or less. In addition, we can say that 57.3° is approximately 60°. Thus, in the present embodiment, it can be said that the angle α formed by the first

- 8 041739 the rolling direction D1 and the rolling direction RD are preferably 60° or more and 90° or less.

As shown in FIG. 4, a plurality of adhesive portions 41 form a strip shape with a width dimension d1 in the second direction D2 on the first surface of the electrical steel sheet 40. In addition, a gap with an interval size d2 is provided between the two adhesive portions 41 next to each other in the second direction D2. The spacing dimension d2 is the width dimension of the area 43 without gluing. Here, the width dimension d1 of the adhesive portion 41 corresponds to the width dimension of the bonding region 42, and the spacing dimension d2 of the adhesive portions 41 corresponds to the width dimension of the non-adhesive region 43.

The width dimension d1 of the adhesive portion 41 is preferably 5% or less than the outer diameter of the stator core 21. When the width dimension d1 is set to 5% or less than the outer diameter of the stator core 21, the electrical steel sheet 40 is slightly locally stretched due to the compressive stress of the adhesive material, and the steel loss deterioration of the electrical steel sheets 40 as a whole can be minimized.

The width dimension d1 of the adhesive portion 41 is preferably smaller than the spacing dimension d2 of the spacing between the adhesive portions 41 next to each other in the second direction D2 (d1<d2). In other words, the width dimension d1 is preferably less than 100% of the spacing dimension d2. As described above, tension occurs in the electrical steel sheet 40 due to mechanical stress when the adhesive material is compressed, and steel loss in the electrical steel sheet 40 increases due to the tension. According to the present embodiment, when the width dimension d1 is smaller than the interval dimension d2, it is possible to minimize the tension of the electrical steel sheet 40 due to the adhesive material and ensure the magnetic properties of the stator core 21.

The width dimension d1 of the adhesive portion 41 is more preferably 67±5% of the dimension d2 of the spacing between the adhesive portions 41 next to each other. When the width dimension d1 is too large relative to the spacing dimension d2, the tension of the electrical steel sheet 40 due to the compressive stress of the adhesive material may increase. On the other hand, when the width dimension d1 is too small relative to the spacing dimension d2, the adhesive strength between the electrical steel sheets 40 may be insufficient. According to the present embodiment, when the width dimension d1 is set to 67±5% of the spacing dimension d2, it is possible to ensure sufficient adhesive strength between the electrical steel sheets 40, minimize the tension of the electrical steel sheet 40, and ensure the magnetic properties of the stator core 21.

In addition, when the width dimension d1 is 67±5% of the interval interval d2, the angle α formed by the first rolling direction D1 and the rolling direction RD is preferably 75±5°. Therefore, the degradation of the magnetic properties of the stator core 21 can be more effectively minimized.

Next, a case is described in which the width dimension d1 of the adhesive portion 41 is larger than the dimension d2 of the spacing between the adhesive portions 41 next to each other (d1>d2). When the width dimension d1 of the adhesive portion 41 is larger than the spacing dimension d2, it is possible to increase the bonding force between the electrical steel sheets 40 .

On the other hand, the tension of the electrical steel sheet 40 due to the stress when the adhesive material is compressed may increase. Therefore, when the width dimension d1 of the adhesive portion 41 is larger than the interval dimension d2, the direction (first direction D1) in which the adhesive portion 41 extends is preferably closer to the direction in which the rigidity is high (the direction orthogonal to the rolling direction RD) . More specifically, when the width dimension d1 of the adhesive portion 41 is larger than the interval dimension d2, the angle α formed by the first rolling direction D1 and the rolling direction RD is preferably 85° or more. Therefore, it is possible to increase the bonding force between the electrical steel sheets 40, minimize the tension of the electrical steel sheet 40, and ensure the magnetic properties of the stator core 21.

In the present embodiment, the rolling directions RD of all the electrical steel sheets 40 forming the stator core 21 coincide with each other. However, the rolling directions RD of all the electrical steel sheets 40 may not coincide with each other. For example, the stator core 21 may be formed by stacking electrical steel sheets 40 in coils. As an example, the following describes a stator core in which electrical steel sheets 40 are stacked on top of each other in coils. In a coiled stator core, one should focus on a layer of one adhesive portion 41 and a set of electrical steel sheets 40 between which the layer is placed. The rolling directions RD of the set of electrical steel sheets 40 between which the layer of the adhesive portion 41 is placed differ from each other. In this case, the angle α formed by the first rolling direction D1 and the rolling direction RD of the electrical steel sheet 40 positioned on one side in the laying direction should be included in the above preferred angle range, and the angle α formed by the first direction D1 and the rolling direction RD of the electrical steel sheet 40 on the other side in the laying direction should be included in the above preferred angle range.

Here, in the coiled stator core, the first directions D1 of the layers of adhesive portions 41 provided between the electrical steel sheets 40 may be different from each other.

In the present embodiment, the rotor core 31 is a laminated core, similar to the stator core 21. Thus, the rotor core 31 includes a plurality of electrical steel sheets stacked on top of each other in the thickness direction. In the present embodiment, the stacking thickness of the rotor core 31 is equal to the stacking thickness of the stator core 21, for example, 50.0 mm. The outer diameter of the rotor core 31, for example, is 163.0 mm. The inner diameter of the rotor core 31, for example, is 30.0 mm. However, these values are examples, and the stacking thickness, outer diameter, and inner diameter of the rotor core 31 are not limited to these values.

In the present embodiment, a plurality of electrical steel sheets forming the rotor core 31 are attached to each other by a fastener C (dowel, see FIG. 1). However, a plurality of electrical steel sheets 40 forming the rotor core 31 can be glued by adhesive portions identical to those for the stator core 21.

Second embodiment.

Next, the electric motor 110 of the second embodiment will be described with reference to FIG. 5 and FIG. 6.

As shown in FIG. 5, the electric motor 110 of the second embodiment includes a rotor 30, a case 50, a rotation shaft 60, and a stator 120, which are identical to those of the first embodiment.

The stator 120 includes a stator core 121 (laminated core), a retaining ring 129, and a winding (not shown).

The stator core 121 is a split core. Therefore, the stator core 121 includes a plurality of core blocks (laminated cores) 124 . A plurality of core blocks 124 are interlocked in an annular shape to form a stator core 121. The retaining ring 129 is located outside the plurality of core blocks 124 in the radial direction. A plurality of core blocks 124 are attached to each other by fitting into a retaining ring 129.

Here, the stator core 121 of the present embodiment is a split core, and other configurations such as dimensions of the respective parts are identical to those of the first embodiment.

Next, the core block 124 will be described.

The core block 124 is an aspect of the laminated core. The core block 124 includes an arcuate back portion 122 that extends in the circumferential direction and a toothed portion 123.

The core back portion 122 forms an arc shape centered on the central axis O when viewed from above when the stator 120 is viewed in the axial direction.

The tooth portion 123 protrudes inwardly in the radial direction from the core back portion 122 (toward the central axis O of the core back portion 122 in the radial direction). When a plurality of core blocks 124 are arranged in an annular shape in the circumferential direction to form the stator core 121, a plurality of tooth portions 123 are arranged at equal intervals in the circumferential direction. In the stator 120 of the present embodiment, 18 tooth portions 123 are provided at 20° intervals centered on the central axis O. A plurality of tooth portions 123 are formed to be of the same shape and size.

The winding is wound around the gear portion 123. The winding may be a concentrated winding or a distributed winding.

The core block 124 is formed by stacking a plurality of electrical steel sheets 140 formed by punching the electrical steel sheet in the axial direction. Thus, the core block 124 includes a plurality of electrical steel sheets 140 stacked on top of each other. Therefore, the stator core 121 is a laminated core. Each of the plurality of electrical steel sheets 140 has a T-shape when viewed in the axial direction.

Fragments 140 of electrical steel sheets forming the core block 124 are formed, for example, by punching a rolled base sheet. Identical electrical steel sheets with the first embodiment can be used as electrical steel sheets 140.

The plurality of electrical steel sheets 140 forming the core block 124 are glued together by the adhesive portions 141. With respect to the adhesive material forming the adhesive portion 141 of the present embodiment, an identical adhesive material with the first embodiment is used.

Next, the relationship between the electrical steel sheet lengths 140 and the adhesive portion 141 will be described with reference to FIG. 6. In FIG. 6, the adhesive portion 141 is highlighted with a dot pattern.

When viewed in the laying direction, a plurality of adhesive portions 141 are formed into a strip shape as a whole. Fragments 140 sheets of electrical steel next to each other in the laying direction are not glued completely, but locally glued and attached to each other.

When viewed in the laying direction, a plurality of adhesive portions 141 form a strip shape in the first direction D1, and the adhesive portions 141 are placed at equal intervals in the second direction D2. In other words, the surface of the electrical steel cuts 140 facing the stacking direction (hereinafter referred to as the first surface of the electrical steel cuts 140) includes a bonding area 142 in which an adhesive portion 141 is provided, and a non-bonding area 143 (empty area) , in which the adhesive portion 141 is not provided. Here, the bonding area 142 of the electrical steel cuts 140 in which the adhesive portion 141 is provided is the area of the first surface of the electrical steel cuts 140 in which the adhesive material cured without separation is provided. In addition, the non-gluing region 143 of the electrical steel sheets 140 in which the adhesive portion 141 is not provided is the first surface area of the electrical steel sheets 140 in which no separation-curing adhesive is provided. The adhesive portions 141 form a strip shape that extends in the first direction D1 and are placed at equal intervals in the second direction D2. Therefore, the bonded area 142 and the non-bonded area 143 of the first surface of the electrical steel cuts 140 form a strip shape that extends in the first direction D1, and the bonded area 142 and the non-bonded area 143 are alternately formed in the second direction D2.

In the core block 124 of the present embodiment, the rolling direction RD of the electrical steel cuts 140 is substantially parallel to the direction in which the tooth portion 123 extends. Thus, the tooth portion 123 extends in the rolling direction RD. Fragments 140 sheets of electrical steel have the smallest loss in steel in the rolling direction RD. Since the magnetic flux flows through the tooth portion 123 in the direction in which the tooth portion 123 passes, if the rolling direction RD is substantially parallel to the direction in which the tooth portion 123 passes, the magnetic properties of the core block 124 can be improved. Here, the terms extend in and substantially parallel include not only strictly parallel, but also extend parallel within a range of ±5°. Thus, in the present embodiment, the angle formed by the direction in which the tooth portion 123 extends and the rolling direction RD is within 5°.

In FIG. 6, the angle α formed by the first rolling direction D1 and the rolling direction RD of the electrical steel cuts 140 is shown. Similar to the above embodiment, the electrical steel sheets 140 have the greatest rigidity in a direction orthogonal to the rolling direction RD, and are almost never stressed under compression. Therefore, when the angle α formed by the first rolling direction D1 and the rolling direction RD is close to 90°, the tension of the electrical steel sheets 140 can be minimized.

In addition, as described above, the steel loss of the electrical steel cuts 140 is smallest in the rolling direction RD, but on the other hand, when tension is generated in the rolling direction RD, the deterioration in steel loss becomes most significant. Therefore, when the first direction D1 coincides with the rolling direction RD of the pieces of electrical steel sheets 140 (angle α=0°), the magnetic properties of the core block 124 deteriorate to the maximum extent. Therefore, when the angle α formed by the first rolling direction D1 and the rolling direction RD is a value very different from 0°, deterioration in steel loss of the electrical steel cuts 140 can be minimized.

In the present embodiment, when the angle α formed by the first rolling direction D1 and the rolling direction RD is a value very different from 0° and more close to 90°, the tension of the electrical steel sheets 140 can be minimized, and the deterioration of steel loss can be minimized. pieces of 140 sheets of electrical steel.

In the present embodiment, the angle α is preferably 45° or more and 90° or less. When the angle α is set to 45° or more, and the first direction D1 intersects the rolling direction at a certain angle or more, the influence of the adhesive material compression stress on the steel loss of the electrical steel sheets 140 can be minimized, the tension of the electrical steel sheets 140 can be minimized. , and as a result, sufficient magnetic properties of the core block 124 can be ensured.

Since the pieces of 140 electrical steel sheets initially have a large loss in

- 11 041739 steel in a specific direction SD, even if the tension occurs in a specific direction SD, the deterioration of iron loss is relatively small. Therefore, when a direction close to the specific direction SD is set as the direction in which the tension occurs, it is possible to minimize the deterioration in steel loss of the electrical steel sheet lengths 140 as a whole.

Here, a configuration is summarized in which the deterioration in steel loss of the electrical steel cuts 140 is minimized. Mainly, the following two configurations are provided, in which the deterioration in steel loss of the electrical steel cut pieces 140 due to the compressive stress of the adhesive material is minimized.

The first configuration is a configuration in which the first direction D1 is closer to the direction orthogonal to the rolling direction RD of the electrical steel cuts 140 . In this configuration, self-tensioning of the pieces of electrical steel sheet 140 is prevented, and deterioration of steel loss is minimized. Thus, in the first configuration, the angle α is preferably close to 90°.

The second configuration is a configuration in which the first direction D1 is closer to the specific direction SD of the electrical steel sheets 140 . In this configuration, the deterioration in steel loss of the electrical steel cuts 140 with respect to tension is minimized. Thus, in the second configuration, the angle α is preferably close to 57.3°.

The deterioration in steel loss of cuts 140 of electrical steel sheets due to mechanical stress when compressing the adhesive material is minimized by the above two configurations. Therefore, when the angle α is set to an angle between 57.3 and 90°, the effects of the above two configurations can be exhibited. Here, even if the angle α changes by approximately ±5°, since there is no significant change in steel loss, the angle α formed by the first rolling direction D1 and the rolling direction RD is preferably 52.3° or more and 90° or less. In addition, since 57.3° can be said to be approximately 60°, in the present embodiment, it can be said that the angle α formed by the first rolling direction D1 and the rolling direction RD is preferably 60° or more and 90° or less.

The plurality of adhesive portions 141 form a strip shape with a width dimension d1 in the second direction D2 on the first surface of the electrical steel sheets 140 . In addition, a gap with an interval size d2 is provided between the two adhesive portions 141 next to each other in the second direction D2. The spacing dimension d2 is the dimension across the width of the region 143 without gluing. Here, the width dimension d1 of the adhesive portion 141 corresponds to the width dimension of the bonding region 142, and the spacing dimension d2 of the adhesive portions 141 corresponds to the width dimension of the non-adhesive region 143.

The width dimension d1 of the adhesive portion 141 is preferably 5% or less than the outer diameter of the stator core 121. When the width dimension d1 is set to 5% or less than the outer diameter of the stator core 121, the electrical steel sheets 140 are slightly locally stretched due to the adhesive material compression stress, and deterioration in steel loss of the electrical steel sheets 140 as a whole can be minimized.

The width dimension d1 of the adhesive portion 141 is preferably smaller than the dimension d2 of the spacing between the adhesive portions 141 next to each other in the second direction D2 (spacing d1<d2). In other words, the width dimension d1 is preferably less than 100% of the spacing dimension d2. As described above, tension occurs in the electrical steel cuts 140 due to mechanical stress when the adhesive material is compressed, and steel loss in the electrical steel cuts 140 increases due to the tension. According to the present embodiment, when the width dimension d1 is smaller than the spacing dimension d2, it is possible to minimize the tension of the electrical steel sheets 140 due to the adhesive material and ensure the magnetic properties of the core block 124.

The width dimension d1 of the adhesive portion 141 is more preferably 60% or less relative to the dimension d2 of the spacing between the adhesive portions 141 next to each other. Therefore, it is possible to more reliably minimize the tension of the electrical steel sheets 140 due to the adhesive material and ensure the magnetic properties of the core block 124 . In addition, for the same reason, the width dimension d1 of the adhesive portion 141 is even more preferably 43% or less relative to the dimension d2 of the spacing between the adhesive portions 141 next to each other.

Next, a case is described in which the width dimension d1 of the adhesive portion 141 is larger than the dimension d2 of the spacing between the adhesive portions 141 next to each other (spacing d1>d2). When the width dimension d1 of the adhesive portion 141 is larger than the spacing dimension d2, it is possible to increase the bonding force between the electrical steel sheets 140.

On the other hand, the tension of the electrical steel sheets 140 may increase due to mechanical stress when the adhesive material is compressed. Therefore, when the width dimension dl of the adhesive portion 141 is larger than the interval dimension d2, the direction in which the adhesive portion 141 extends (the first direction D1) is preferably closer to the direction in which the rigidity is high (the direction orthogonal to the rolling direction RD) . More specifically, when the width dimension d1 of the adhesive portion 141 is larger than the interval dimension d2, the angle α formed by the first rolling direction D1 and the rolling direction RD is preferably 85° or more. Therefore, the bonding force between the electrical steel sheets 140 can be increased, the tension of the electrical steel sheets 140 can be minimized, and the magnetic properties of the core block 124 can be maintained.

Next, the production method of 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 process and a second process.

First, in the first process, a plurality of T-shaped pieces of electrical steel sheet 140 are punched from the rolled electrical steel sheet. In the first process, pieces of electrical steel sheet 140 are punched such that the tooth portions are drawn in the rolling direction RD of the electrical steel sheet.

Thereafter, in the second process, a plurality of electrical steel sheets 140 are stacked on top of each other with adhesive portions 141 provided therebetween. In the second process, the plurality of adhesive portions 141 form a strip shape that extends in the first direction D1 when viewed from the laying direction. In addition, a plurality of adhesive portions 141 are placed in the second direction D2. In addition, a plurality of electrical steel sheets 140 are stacked on top of each other such that the angle formed by the first rolling direction D1 and the rolling direction RD becomes 45° or more and 90° or less. When the adhesive portion 141 is cured, a plurality of electrical steel sheets 140 are attached to each other.

modified example.

The following describes the adhesive parts 241 of the modified example that can be applied to the above embodiments with reference to FIG. 7. Here, components identical to those in the above-described embodiments are designated by identical reference numbers, and their descriptions are omitted.

Similar to the above embodiment, a plurality of adhesive portions 241 are provided between the electrical steel sheets 40 (or electrical steel sheets 140) of this modified example. The adhesive portions 241 form a band shape in the first direction D1 on the first surface of the electrical steel sheet 40 when viewed from the stacking direction. In addition, a plurality of adhesive portions 241 are arranged at equal intervals in the second direction D2. The two adhesive portions next to each other in the second direction D2 are configured to be separated by the spacing dimension d2.

The adhesive portions 241 of this modified example include a plurality of elemental adhesive portions 241c placed in the first direction D1. In the present embodiment, the elemental adhesive portions 241c are a mass of a plurality of adhesive materials that are placed in the first direction D1 and form the adhesive portions 241. The plurality of adhesive materials have an almost identical shape. The element adhesive portions 241c next to each other in the first direction D1 are engaged with each other. The element adhesive portions 241c have a substantially oval shape with the first direction D1 as the major axis when viewed in the laying direction. Therefore, both ends of the adhesive portions 241 in the width direction are wound and drawn in the first direction D1. The element adhesive portions 241c may have a substantially circular shape, in addition to the substantially oval shape shown in this modified example.

As shown in this modified example, the adhesive portion that extends in the form of a strip in this detailed description need not be linear at both ends in the width direction, and may be wound in the first direction D1.

The adhesive portions 241 are extended along the center line CL centered on the center line CL parallel to the first direction D1. The adhesive portions 241 have a symmetrical shape centered on the center line CL.

As shown in this modified example, when both ends of the adhesive portions 241 in the width direction are wound and drawn, the width dimension d1 of the adhesive portions 241 can be set as follows. Thus, a virtual line VL that linearly approximates both ends of the adhesive portions 241 in the width direction is set, and the width dimension d1 of the adhesive portions 241 is set. The virtual line VL runs almost parallel to the center line CL. The pair of virtual lines VL are virtual straight lines, which are defined such that the area of the area located between the pair of virtual lines VL is equal to the area of the adhesive portions 241 when viewed in the laying direction.

In this modified example, the width dimension d1 of the adhesive portions 241 is the dimension in terms of the distance between the pair of virtual lines VL in the second direction D2. In addition, in

- 13 041739 In this modified example, the spacing size d2 is the size in terms of the distance between the virtual lines VL of the adhesive portions 241 next to each other.

The adhesive portion 241 shown in this modified example may have the same effects as the adhesive portion 41 in the above embodiment. This type of adhesive portion 241 is formed by, for example, applying adhesive material to a plurality of dots on the electrical steel sheet 40 in dot shapes from a plurality of spray guns in the first direction D1, and then pressing the electrical steel sheet 40 against another electrical steel sheet 40 and compressing the adhesive material between the two sheets 40 electrical steel. Thus, even if the width dimension of the adhesive portions 241 is not uniform, identical effects can be obtained with the above-described embodiment.

Here, the scope of the present invention is not limited to the above embodiments and their modified examples, and various modifications can be made without departing from the gist of the present invention.

In the above-described embodiments, a case is described in which the adhesive portions are provided in the entire area in the plane of the electrical steel sheet 40 or the electrical steel sheet cut 140. However, the adhesive portions may be partially provided in the plane of the electrical steel sheet 40 or the section 140 of the electrical steel sheet. As an example, strip adhesive portions may only be provided in a region overlapping a back portion of the core of the electrical steel sheet. In addition, strip adhesive portions may only be provided in a region overlapping the toothed portion of the electrical steel sheet.

The shape of the stator core is not limited to the shape shown in the above embodiments. In particular, the dimensions of the outer diameter and the inner diameter of the stator core, the stacking thickness, the number of slots, the ratio of the dimensions of the circumferential direction and the radial direction of the tooth portion, the ratio of the dimensions of the tooth portion and the back portion of the core in the radial direction, and the like. can be arbitrarily calculated according to the required characteristics of the electric motor.

In addition, in the core block 124 of the second embodiment, a convex shape may be provided on one end side of the core back portion 122 in the circumferential direction, and a concave shape may be provided on the other end side thereof in the circumferential direction. In this case, when the convex shape is inserted into the concave shape, the positional deviation can be minimized when the plurality of core blocks 124 are engaged in the circumferential direction. In addition, the core block may have two or more toothed portions for one portion of the back of the core. In addition, the back portion of the core and the toothed portion may be a separate core block.

In the rotor in the above embodiments, a set of two permanent magnets 32 forms one magnetic pole, but the present invention is not limited to this. For example, one permanent magnet 32 may form one magnetic pole, and three or more permanent magnets 32 may form one magnetic pole.

In the above-described embodiments, a permanent magnet motor is roughly illustrated as a motor, but the structure of the motor is not limited to this as illustrated below, and in addition, various known structures not illustrated roughly below can also be used.

In the above embodiments, the permanent magnet motor is roughly illustrated as a synchronous motor, but the present invention is not limited thereto. For example, the motor may be a reluctance motor or an electromagnetic field motor (two winding motor).

In the above embodiments, the synchronous motor is roughly illustrated as an AC motor, but the present invention is not limited thereto. For example, the motor may be an induction motor.

In the above embodiments, an AC motor is roughly illustrated as a motor, but the present invention is not limited thereto. For example, the motor may be a DC motor.

In the above embodiments, the motor is roughly illustrated as a motor, but the present invention is not limited thereto. For example, the electric motor may be a generator.

In the above embodiments, the case where the laminated core according to the present invention is applied to a stator core is roughly illustrated, but the laminated core can also be applied to a rotor core. In addition, the laminated core according to the present invention can be applied to a laminated core other than a motor, such as a transformer.

In addition, the components in the above-described embodiments can be appropriately replaced by known components without departing from the gist of the present invention, and the above modified examples can be appropriately combined.

- 14 041739

Examples

After that, verification tests are carried out in order to prove the above operations and benefits. The verification test is performed by simulation using the software. As software, the electromagnetic field simulation software based on the JMAG finite element method (offered on the market by JSOL Corporation) was used.

First verification test.

First, as a first verification test, the integrated core roughly illustrated in the first embodiment was tested. As models used for simulation, stator cores (laminated cores) of model number A1A22 are assumed, which are described below. The electrical steel sheet used for each model is a non-grain-oriented electrical steel sheet with a plate thickness of 0.25 mm. The shape of the electrical steel sheet is identical to that shown in FIG. 2.

In the stator cores of model numbers A1-A21, the plurality of adhesive portions shown in FIG. 4 are provided between sheets of electrical steel. Thus, in the stator cores of models A1 to A21, a plurality of adhesive portions are drawn in the form of a strip in the first direction D1. On the other hand, in the stator core of model No. A22, between electrical steel sheets, adhesive portions are provided on the entire first surface of the electrical steel sheet. Thus, adhesive portions of model number A22 are provided on the entire first surface of the electrical steel sheet. The stator core model number A22 is a model prepared to determine the steel loss reference value. Hereinafter in this document, the stator core model number A22 is referred to as the reference model.

Stator cores of model numbers A1-A7 are models of group A1. In models of group A1, the dimension d1 across the width of the adhesive portion is 233% of the dimension d2 of the spacing between the adhesive portions next to each other. In models of group A1, the dimension d1 along the width of the adhesive portion is 7 mm, and the dimension d2 of the interval between the adhesive portions is 3 mm.

Stator cores of model numbers A8-A14 are models of group A2. In models of group A2, the dimension d1 across the width of the adhesive portion is 167% of the dimension d2 of the spacing between the adhesive portions next to each other. In models of group A2, the dimension d1 along the width of the adhesive portion is 5 mm, and the dimension d2 of the interval between the adhesive portions is 3 mm.

Stator cores of model numbers A15-A21 are models of group A3. In models of group A3, the dimension d1 across the width of the adhesive portion is 67% of the dimension d2 of the spacing between the adhesive portions next to each other. In models of group A3, the dimension d1 along the width of the adhesive portion is 2 mm, and the dimension d2 of the interval between the adhesive portions is 3 mm.

In the A1 group, the A2 group, and the A3 group, patterns are prepared in which the angle α formed by the first rolling direction D1 and the rolling direction RD (see FIG. 4) is set to 0, 15, 30, 45, 60, 75, and 90 °.

Tab. 1 shows the steel loss simulation results of the electrical steel sheet for each model. Here, the steel loss of each model is expressed as a percentage based on the steel loss value of the reference model (stator core model No. A22). In addition, tab. 1 shows the results of a drop test on a mock-up, which provides identical adhesive parts to the adhesive parts in each model. In the drop test, each model is dropped 10 times from a height of 1 m. Rating A indicates that the adhesive parts do not peel off after being dropped 10 times. In addition, the A- rating indicates that the adhesive parts do not peel off after being dropped 5 times, but peel off on the 10th time.

Table 1

Model number Width dimension dl / spacing dimension d2 Angle a [°] Relations e loss in steel [%] Drop test A comment Group A1 A1 233% 0° 96.661 A

- 15 041739

A2 233% 15° 96.695 A AZ 233% 30° 96.593 A A4 233% 45° 96.525 A A5 233% 60° 96.457 A Ab 233% 75° 96.354 A A7 233% 90° 96.252 A Group A2 A8 167% 0° 95.843 A A9 167% 15° 95.741 A AYu 167% 30° 95.639 A AN 167% 45° 95.537 A A12 167% 60° 95.434 A A13 167% 75° 95.366 A A14 167% 90° 95.332 A AZ group A15 67% 0° 92.572 A- A16 67% 15° 92.504 A- A17 67% 30° 92.334 A- A18 67% 45° 92.266 A- A19 67% 60° 92.164 A- A20 67% 75° 92.095 A- A21 67% 90° 92.129 A- A22 - - 100 - reference model

Comparing the stator cores of model numbers A1 to A21, it is confirmed that in a model belonging to any of the groups 1 to A3, when the angle α formed by the first rolling direction D1 and the rolling direction RD is 30° or more, steel loss can be minimized. . In addition, it is confirmed that when the angle α is 60° or more, steel loss can be further minimized.

When comparing the A1 group, A2 group and A3 group with each other, the steel loss of the A3 group model is the smallest. In the A3 group model, the width dimension d1 is 67% of the spacing dimension d2. Thus, in the model of group A3, the width dimension d1 is less than the dimension d2 of the interval. Therefore, it is considered that the tension of the electrical steel sheet 40 due to the adhesive material is minimized, and the magnetic properties of the stator core 21 can be ensured. In addition, it is confirmed that when the width dimension d1 is 67% with respect to the interval dimension d2, deterioration in the steel loss of the electrical steel sheet 40 can be minimized. Even if the ratio of the width dimension d1 to the spacing dimension d2 is changed by about ±5%, there is no significant change in steel loss. Therefore, it can be said that even if the width dimension d1 is 67±5% with respect to the spacing dimension d2, deterioration in the steel loss of the electrical steel sheet 40 can be minimized.

When comparing the respective models in the A3 group, the stator core of the model No. A20 in which the angle α formed by the first rolling direction D1 and the rolling direction RD is 75° has the smallest steel loss. Thus, it is confirmed that when the width dimension d1 is 67% of the interval dimension d2, if the angle α is set to 75°, the deterioration of steel loss can be significantly minimized. Here, even if the angle α is changed by about ±5°, there is no significant change in steel loss. In addition, even if the ratio of the width dimension d1 to the interval dimension d2 is changed by about ±5%, there is no significant change in steel loss. Therefore, it can be said that when the width dimension d1 is 67±5% with respect to the interval dimension d2, if the angle α is set to 75±5°, the deterioration of iron loss can be significantly minimized.

In the A2 group model, the width dimension d1 is 167% of the interval dimension d2. When comparing the respective models in the A2 group, the stator core of the model No. A14 in which the angle α formed by the first rolling direction D1 and the rolling direction RD is 90° has the smallest steel loss. Thus, it is confirmed that when the width dimension d1 is 167% with respect to the interval dimension d2, if the angle α is set to 75°, the deterioration of iron loss can be significantly minimized. As described above, even if the angle α is changed by about ±5°, there is no significant change in iron loss. In addition, even if

- 16 041739 the ratio of the dimension dl in width to the dimension d2 of the interval is changed by approximately ±5%, there is no significant change in steel losses. Therefore, it can be said that when the width dimension d1 is 167±5% with respect to the interval dimension d2, if the angle α is set to 85° or more, the deterioration of steel loss can be significantly minimized.

In the A1 group model, the width dimension d1 is 233% of the interval size d2 of the interval. When comparing the respective models in the A1 group, the stator core of the model No. A7 in which the angle α formed by the first rolling direction D1 and the rolling direction RD is 90° has the smallest steel loss. Thus, it is confirmed that when the width dimension d1 is 233% with respect to the interval dimension d2, if the angle α is set to 75°, the deterioration of iron loss can be significantly minimized. As described above, even if the angle α is changed by about ±5°, there is no significant change in iron loss. In addition, even if the ratio of the width dimension d1 to the interval dimension d2 is changed by about ±5%, there is no significant change in steel loss.

Therefore, it can be said that when the width dimension d1 is 233±5% with respect to the interval dimension d2, if the angle α is set to 85° or more, the deterioration of iron loss can be significantly minimized.

As shown in Table. 1, the A1 group and A2 group dummies have better drop strength than the A3 group dummies. In the layouts of group A1 and group A2, the size d1 in the width of the adhesive part is greater than the size d2 of the interval, and in the layout of group A3, the size d1 in the width of the adhesive part is less than the size d2 of the interval. Accordingly, it is confirmed that when the width dimension d1 of the adhesive portion is larger than the dimension d2 of the spacing between the adhesive portions next to each other in the second direction D2, it is possible to increase the adhesive strength.

Thereafter, in addition to the above models numbers A1-A21, simulation is performed for models in which the width dimension d1/spacing dimension d2 and the angle α vary over a wide range. More specifically, models are prepared for simulation in which the width dimension d1/interval dimension d2 is changed by 0, 50, 67, 100, 150, 167, 200, 233, 250, 300, 350, 400, 450, and 500%, and the angle α is changed to 0, 15, 30, 45, 60, 75, and 90°, and the steel loss is calculated. In addition, based on these simulation results, the threshold value at which steel loss is improved is verified for the reference model number A22 of the prior art.

Fig. 8 is a graph in which the horizontal axis represents the width dimension d1/spacing dimension d2, and the vertical axis represents the angle α, and the steel loss ratio with respect to reference model number 22 is indicated by grayscale. In FIG. 8, a region in which the grayscale density is low indicates that the iron loss is improved (i.e., the iron loss ratio is 100% or less) compared to the reference model number A22.

As shown in FIG. 8, when the width dimension d1/interval dimension d2 is 368% or less, the steel loss is improved compared with the prior art reference model No. A22 regardless of the angle a. Thus, it is confirmed that the width dimension d1 of the adhesive portion is preferably 368% or less with respect to the dimension d2 of the spacing between the adhesive portions next to each other in the second direction D2. When the width dimension d1/interval dimension d2 is smaller, the steel loss is improved, and the width dimension d1/interval dimension d2 is preferably 233% or less, more preferably 167% or less, and even more preferably 67% or less.

Second verification test.

Thereafter, in the second proof test, the split core roughly illustrated in the second embodiment was tested.

As models used for simulation, stator cores (laminated cores) of model numbers B1-B21 are assumed, which are described below. The stator cores of model numbers B1-B21 have a plurality of core blocks interlocked in the circumferential direction. The core block for each stator core is formed from a piece of non-grain-oriented electrical steel sheet with a plate thickness of 0.25 mm. The cut-off shape of the electrical steel sheet is identical to that shown in FIG. 6, and the rolling direction RD of the electrical steel sheet cut is the same as the direction in which the tooth portion extends.

In the core blocks of model numbers B1-B21, a plurality of adhesive portions as shown in FIG. 6 are provided between pieces of electrical steel sheets. Thus, in the core blocks of models B1 to B21, a plurality of adhesive portions are drawn in the form of a strip in the first direction D1.

Model number B1-B7 stator cores are B1 group models. In group B1 models, the dimension d1 across the width of the adhesive portion is 150% of the dimension d2 of the spacing between the adhesive portions next to each other. The dimension d1 along the width of the adhesive part of the models of group B1 is 3 mm, and the dimension d2 of the interval between the adhesive parts is 2 mm. The stator cores in group B1 in which the angle α formed by the first direction D1 and the rolling direction RD (see Fig. 6) is set to 0, 15, 30, 45, 60, 75 and 90° are used as models number B1B7.

Model number B8-B14 stator cores are B2 group models. In group B2 models, the dimension d1 across the width of the adhesive portion is 60% of the dimension d2 of the spacing between the adhesive portions next to each other. In group B2 models, the dimension d1 along the width of the adhesive portion is 3 mm, and the dimension d2 of the interval between the adhesive portions is 5 mm. The stator cores in the group B2 in which the angle α formed by the first rolling direction D1 and the rolling direction RD (see Fig. 6) is set to 0, 15, 30, 45, 60, 75, and 90° are used as models no. B8-B14.

Stator cores of model numbers B15-B21 are models of group B3. In group B3 models, the dimension d1 across the width of the adhesive portion is 43% relative to the dimension d2 of the spacing between the adhesive portions next to each other. In group B3 models, the dimension d1 along the width of the adhesive portion is 3 mm, and the dimension d2 of the interval between the adhesive portions is 7 mm. The stator cores in the group B3 in which the angle α formed by the first rolling direction D1 and the rolling direction RD (see Fig. 6) is set to 0, 15, 30, 45, 60, 75, and 90° are used as models number B15-B21.

In addition, as a comparison target, as shown in FIG. 9, the core steel loss 121X of the stator model No. B22 is determined, in which a plurality of non-grain-oriented electrical steel sheets 140 are fixed in all layers. Model number B22 stator core 121X is a model prepared to compare iron loss between the conventional configuration and the present invention. Hereinafter in this document, the stator core model number B22 is referred to as the reference model. The reference model stator core 121X has a plurality of core blocks 124X. In the base model stator core 121X, the plate thickness of the electrical steel cuts 140 is 0.25 mm, and the rolling direction RD of the cut electrical steel sheet is the same as the direction in which the toothed part runs. In the core block for the reference model stator core 121X, a first fixture C1 provided in the core back portion 122 and two second fixtures C2 provided in the toothed portion 123 are provided. The first fixture C1 is positioned at the center of the core back portion 122 in the circumferential direction. The two second attachments C2 are positioned in the radial direction at the center of the tooth portion 123 in the circumferential direction. The area ratio of the attachments C1 and C2 in the first surface of the electrical steel sheets 140 is about 3.2%.

Tab. 2 shows the results of steel loss simulation of a piece of electrical steel sheet for each model. In addition, tab. 2 shows the results obtained by performing a drop test on dummies that provide adhesive parts identical to the adhesive parts of each model. The drop test is carried out in the same procedure as in the above first proof test. In addition, the evaluation criteria for the drop test in this test are identical to the evaluation criteria in the first verification test.

Here, the iron loss retardation rate Rt shown in Table 2 is a value obtained by dividing the difference between the steel loss of each model and the steel loss of the reference model (stator core model No. B22) by the steel loss of the reference model, and is expressed as a percentage. Thus, the steel loss retardation rate in the table is expressed by the following formula (1) when the steel loss of each model is set as W and the steel loss of the reference model is set as Worg.

Mathematical expression 1.

»=-^ ^x1 °° №1 ω from?

table 2

Model number Width dimension dl / spacing dimension d2 Angle a [°] Rt speed slow down i loss in steel [%] Drop test A comment Group B1 IN 1 150% 0° -6.9 A AT 2 150% 15° -7.2 A VZ 150% 30° -7.5 A

- 18 041739

AT 4 150% 45° -7.9 A AT 5 150% 60° -8.0 A wb 150% 75° -7.8 A AT 7 150% 90° -8.3 A Group B2 AT 8 60% 0° -7.5 A- AT 9 60% 15° -7.8 A- AT 10 60% 30° -7.8 A- IN AND 60% 45° -7.9 A- AT 12 60% 60° -8.1 A- B13 60% 75° -8.3 A- B14 60% 90° -8.5 A- VZ group B15 43% 0° -7.5 A- B16 43% 15° -7.7 A- B17 43% 30° -8.0 A- B18 43% 45° -8.2 A- B19 43% 60° -8.2 A- IN 20 43% 75° -8.6 A- AT 21 43% 90° -8.9 A- B22 - - 0 - reference model

Comparing the stator cores of model numbers B1 to B21, it is confirmed that in a model belonging to any of the groups 1 to B3, when the angle α formed by the first rolling direction D1 and the rolling direction RD is 45° or more, it is possible to sufficiently minimize iron loss (iron loss deceleration rate Rt is −7.8% or less). In addition, it is confirmed that when the angle α is 60° or more, iron loss can be further minimized (steel loss deceleration rate Rt is −7.9% or less).

When comparing group B1, group B2, and group B3 with each other, the steel loss of model B2 group is smaller than the loss of model steel of B1 group, and further, the loss of model steel of B3 group is the smallest. In models of group B2 and group B3, the width dimension d1 is less than the dimension of the interval interval d2. Therefore, it is considered that the tension of the electrical steel sheets 140 due to the adhesive material is minimized, and the magnetic properties of the stator core 121 can be ensured. In the B2 group model, the width dimension d1 is 60% of the interval dimension d2, and in the B3 group model, the width dimension d1 is 43% of the interval dimension d2. Thus, in the B3 group model, the ratio of the width dimension d1 to the spacing dimension d2 is less than the ratio of the B2 group model. It is confirmed that it is possible to minimize the deterioration in steel loss of cuts 140 electrical steel sheets more effectively in the B3 group model than in the B2 group model. Thus, according to this proof test, it is confirmed that when the width dimension d1 is 60% or less of the interval dimension d2, steel loss can be minimized, and when the width dimension d1 is 43% or less of the interval dimension d2, it is possible to further minimize steel losses.

Since the ratio of the width dimension d1 to the spacing dimension d2 is different for each of the B1 group, the B2 group and the B3 group, the preferred ranges of the angles a are different from each other. The rate Rt of slowing down losses in steel in table. 2 is preferably -8% or less as one standard.

In the B1 group model, the width dimension d1 is 150% of the interval dimension d2. If the corresponding models in the group B1 are compared only in the stator core of the model number B7 in which the angle α formed by the first rolling direction D1 and the rolling direction RD is set to 90°, the steel loss is less than -8%. Thus, it is confirmed that when the width dimension d1 is 150% of the interval dimension d2, if the angle α is set to 90°, the deterioration of iron loss can be largely and sufficiently minimized. Here, even if the angle α is changed by about ±5°, there is no significant change in steel loss. In addition, even if the ratio of the width dimension d1 to the interval dimension d2 is changed by about ±5%, there is no significant change in steel loss. Therefore, it can be said that when the width dimension d1 is 150±5% of the interval size d2 of the interval, if the angle α is set to 85° or more, the deterioration of iron loss can be sufficiently minimized.

In the model of group B2, the size d1 in width is 60% of the size of the interval d2 in

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Claims (32)

terval. When comparing the respective models in the B2 group, in the stator cores of the model numbers B12, 13 and 14 in which the angle α formed by the first rolling direction D1 and the rolling direction RD is 60° or more, the steel loss is less than -8%. Thus, it is confirmed that when the width dimension d1 is 60% of the interval dimension d2, if the angle α is set to 60° or more, the deterioration of iron loss can be sufficiently minimized. As described above, even if the ratio of the width dimension d1 to the interval dimension d2 is changed by about ±5%, there is no significant change in iron loss. Therefore, it can be said that when the width dimension d1 is 60±5% of the interval dimension d2, if the angle α is set to 60° or more, the deterioration of iron loss can be largely and sufficiently minimized. In the B3 group model, the width dimension d1 is 43% of the interval dimension d2. When comparing the respective models in group B3, in the stator cores of model numbers B18, 19, 20 and 21, in which the angle α formed by the first rolling direction D1 and the rolling direction RD is 45° or more, the steel loss is less than -8%. Thus, it is confirmed that when the width dimension d1 is 43% of the interval dimension d2, if the angle α is set to 45° or more, the deterioration of iron loss can be sufficiently minimized. As described above, even if the ratio of the width dimension d1 to the interval dimension d2 is changed by about ±5%, there is no significant change in steel loss. Therefore, it can be said that when the width dimension d1 is 43±5% of the interval dimension d2, if the angle α is set to 60° or more, the deterioration of iron loss can be largely and sufficiently minimized. As shown in Table. 2, the B1 group dummy has better drop strength than the B2 group and B3 group dummy. In the layout of group 1, the size d1 in the width of the adhesive part is larger than the size d2 of the interval, and in the layouts of group B2 and group B3, the size d1 in the width of the adhesive part is less than the size d2 of the interval. Accordingly, it was confirmed that, also in the split core, when the width dimension d1 of the adhesive portion is larger than the dimension d2 of the spacing between the adhesive portions next to each other in the second direction D2, it is possible to increase the adhesive strength. Industrial applicability. According to the present invention, the magnetic properties can be improved. Therefore, the industrial applicability is wide. Brief description of links with numbers 10, 110 - electric motor, 21 - stator core (laminated core), 22, 122 - part of the back of the core, 23, 123 - toothed part, 40 - a sheet of electrical steel, 41, 141, 241 - adhesive part, 124, 124X - core block, 140 - piece of electrical steel sheet, D1 - first direction, D2 - second direction, d1 - width dimension, d2 - interval dimension, RD - rolling direction, α - angle. CLAIM 1. Laminated core containing: a plurality of electrical steel sheets stacked on top of each other; and a plurality of adhesive portions that are placed between the electrical steel sheets next to each other in the stacking direction and adhere the electrical steel sheets to each other, each of the plurality of adhesive portions being a cured adhesive material of a thermosetting adhesive material, a room temperature curing adhesive material, or adhesive material based on radical polymerization, while looking in the installation direction: the plurality of adhesive portions form a strip shape that extends in the first direction, the plurality of adhesive portions are arranged at intervals in the second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 30° or more and 90° or less. 2. The laminated core according to claim 1, wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet is 52.3° or more. - 20 041739 3. The laminated core according to claim 1 or 2, wherein the width dimension of the adhesive portion is smaller than the spacing dimension between the adhesive portions next to each other in the second direction. 4. The laminated core according to claim 3, wherein the width dimension of the adhesive portion is 67±5% of the spacing dimension between the adhesive portions next to each other in the second direction. 5. The laminated core according to claim 4, wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet is 75±5°. 6. The laminated core according to claim 1 or 2, wherein the width dimension of the adhesive portion is larger than the spacing between the adhesive portions next to each other in the second direction. 7. The laminated core according to claim 6, wherein the width dimension of the adhesive portion is 167±5% with respect to the spacing dimension between the adhesive portions next to each other in the second direction, and wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet , is 85° or more. 8. The laminated core according to claim 6, wherein the width dimension of the adhesive portion is 233±5% with respect to the spacing dimension between the adhesive portions next to each other in the second direction, and wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet , is 85° or more. 9. The laminated core according to claim 1 or 2, wherein the width dimension of the adhesive portion is 368% or less relative to the spacing dimension between the adhesive portions next to each other in the second direction. 10. Laminated core according to any one of claims 1 to 9, wherein the average thickness of the adhesive portions is 1.0-3.0 µm. 11. The laminated core according to any one of claims 1 to 10, wherein the average tensile modulus E of the adhesive portions is 1500-4500 MPa. 12. A laminated core according to any one of claims 1 to 11, wherein the adhesive portion is an SGA-containing acrylic-based adhesive at room temperature made from an elastomer-containing acrylic-based adhesive. 13. The laminated core according to any one of claims 1 to 12, wherein the adhesive portion is a cured adhesive of a thermosetting adhesive, wherein the melting point of the adhesive portion is 200°C or higher. 14. A core block that constitutes a laminated core by interlocking a plurality of core blocks in an annular shape, comprising: a plurality of pieces of electrical steel sheets stacked on top of each other; and a plurality of adhesive portions that are placed between the pieces of electrical steel sheets next to each other in the laying direction and adhere the pieces of electrical steel sheets to each other, each of the plurality of adhesive portions being a cured adhesive material of a thermosetting adhesive material cured at room temperature adhesive material or adhesive material based on radical polymerization, while looking in the laying direction: the plurality of adhesive portions form a strip shape that extends in the first direction, the plurality of adhesive portions are arranged at intervals in the second direction orthogonal to the first direction, and the angle formed by the first direction and the rolling direction of the section of the electrical steel sheet is 45° or more and 90 ° or less. 15. The core block according to claim 14, wherein the angle formed by the first direction and the rolling direction of the electrical steel cut piece is 52.3° or more. 16. The block of the core according to claim 14 or 15, containing: an arcuate core back portion; and a toothed portion that protrudes from the core back portion in the radial direction of the core back portion, with the toothed portion extending in the rolling direction. 17. A core block according to any one of claims 14 to 16, wherein the width dimension of the adhesive portion is smaller than the spacing dimension between the adhesive portions next to each other in the second direction. 18. The core block of claim 17, wherein the width dimension of the adhesive portion is 60% or less relative to the spacing dimension between the adhesive portions next to each other in the second direction. 19. The core block of claim 18, wherein the width dimension of the adhesive portion is 43% or less relative to the spacing dimension between the adhesive portions next to each other in the second direction. 20. The core block of claim 18, wherein the width dimension of the adhesive portion is 43±5% of the spacing dimension between adhesive portions next to each other in the second direction, and - 21 041739 wherein the angle formed by the first direction and the rolling direction of the electrical steel cut piece is 45° or more. 21. The core block according to claim 17, wherein the width dimension of the adhesive portion is 60±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and wherein the angle formed by the first direction and the rolling direction of the section of the electrical sheet steel is 60° or more. 22. A core block according to any one of claims 14 to 16, wherein the width dimension of the adhesive portion is larger than the spacing dimension between the adhesive portions next to each other in the second direction. 23. The core block according to claim 22, wherein the width dimension of the adhesive portion is 150±5% with respect to the size of the interval between the adhesive portions next to each other in the second direction, and wherein the angle formed by the first direction and the rolling direction of the section of electrical sheet steel is 85° or more. 24. A core block according to any one of claims 14 to 23, wherein the average thickness of the adhesive portions is 1.0-3.0 µm. 25. A core block according to any one of claims 14 to 24, wherein the average tensile modulus E of the adhesive portions is 1500-4500 MPa. 26. A core block according to any one of claims 14 to 25, wherein the adhesive portion is an SGA-containing acrylic-based adhesive at room temperature made from an elastomer-containing acrylic-based adhesive. 27. A core block according to any one of claims 14 to 26, wherein the adhesive portion is a cured adhesive of a thermosetting adhesive, wherein the melting point of the adhesive portion is 200°C or higher. 28. A laminated core formed by interlocking a plurality of core blocks according to any one of claims 14 to 27 in an annular shape. 29. An electric motor containing a laminated core according to any one of claims 1-13 and 28. 30. A method for the production of a core block, containing: a first process in which a plurality of electrical steel sheet lengths are punched out of the electrical steel sheet; and a second process in which a plurality of electrical steel sheet lengths are stacked on top of each other with adhesive portions interposed therebetween, each of the adhesive portions being a cured adhesive of a thermosetting adhesive, a room temperature curing adhesive, or a radical free radical adhesive. polymerization process, wherein in the first process, a piece of electrical steel sheet is punched out such that the tooth portion extends in the rolling direction of the electrical steel sheet, while in the second process, a plurality of adhesive portions form a strip shape that extends in the first direction when viewed from the laying direction , a plurality of adhesive portions are spaced in a second direction orthogonal to the first direction, and a plurality of electrical steel sheet lengths are stacked on top of each other such that the angle formed by the first direction and rolling phenomenon is 45° or more and 90° or less. 31. The method for producing a core block according to claim 30, wherein the width dimension of the adhesive portion is smaller than the spacing dimension between the adhesive portions next to each other in the second direction. 32. A method for producing a core block according to claim 30 or 31, wherein the adhesive portion is a cured adhesive material of a thermosetting adhesive material, wherein the melting point of the adhesive portion is 200°C or higher. -