Rotating electrical machine, non-oriented electromagnetic steel sheet, and laminated core, and method for manufacturing rotating electrical machine and method for manufacturing laminated core

Abstract

This rotary electric machine comprises a stator, a rotor, and a casing that houses the stator and the rotor. A, which is the ｛111｝<211> orientation intensity of a base steel sheet of a non-oriented electrical steel sheet included in the stator, is less than 15, B, which is the ｛111｝<211> orientation intensity of a base steel sheet of a non-oriented electrical steel sheet included in the rotor, is 2-30, and A and B satisfy a relationship of B / A>1.0. C, which is the ｛411｝<011> orientation intensity of the base steel sheet of the non-oriented electrical steel sheet included in the stator, is 2-50, D, which is the ｛411｝<011> orientation intensity of the base steel sheet of the non-oriented electrical steel sheet included in the rotor, is 1-40, and C and D satisfy a relationship of C / D>1.0.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine, an isotropic electromagnetic steel sheet and a laminated core, and a method for manufacturing a rotating electrical machine and a method for manufacturing a laminated core. This application claims priority based on Japanese Patent Application No. 2021-187952 filed in Japan on November 18, 2021, and incorporates the content herein by reference.

Background Art

[0002] In this specification, the isotropic electromagnetic steel sheet before lamination constituting the stator core is referred to as the core material of the stator, and the isotropic electromagnetic steel sheet before lamination constituting the rotor core is referred to as the core material of the rotor. In some cases, the combination of the stator core and the rotor core is referred to as a motor core.

[0003] Electromagnetic steel sheets, particularly isotropic electromagnetic steel sheets, are used as core materials for rotating electrical machines. For example, rotating electrical machines are used as drive motors mounted in hybrid vehicles, fuel cell vehicles, electric vehicles, and the like. In future automotive drive motors, both low noise and high torque are required. The noise of the motor is mainly generated by the non-uniformity of the magnetic attractive force. Also, if the gap between the stator and the rotor becomes non-uniform due to eccentricity of the rotor or the like, the magnetic attractive force also becomes non-uniform, which causes an increase in motor noise.

[0004] Patent Document 1 proposes an isotropic electromagnetic steel sheet having small magnetic anisotropy and high magnetic flux density, which is effective for improving the efficiency of an actual machine motor and reducing the noise during rotation. In a motor, magnetic flux flows through the air gap between the stator part and the rotor part, and the interaction of this magnetic flux generates torque on the rotor. The greater the anisotropy of the electromagnetic steel sheet, which is the stator material, that is, the greater the difference in magnetic characteristics in the plane of the plate, the greater the difference in torque at the rotational position of the rotor. It is described that the fluctuation of torque during rotation causes rotational unevenness and affects the noise.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-49402 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] The present invention provides a rotating electrical machine that realizes both low noise and high torque required for an automotive drive motor, a rotor and a stator material of such a rotating electrical machine, a non-oriented electrical steel sheet suitable as a material, a laminated core formed by laminating the non-oriented electrical steel sheet, and methods for manufacturing these. [Means for Solving the Problems]

[0007] The noise of the motor is mainly generated by the non-uniform magnetic attraction force between the stator and the rotor. When the gap between the stator and the rotor becomes non-uniform due to eccentricity of the rotor or the like, the magnetic attraction force also becomes non-uniform, which causes an increase in noise.

[0008] {111} of the non-oriented electrical steel sheet <uvw>It has been found that the anisotropy of the Young's modulus (the proportionality coefficient between elongation and stress in the elastic deformation range) in the in-plane direction of the plate surface is small. Based on this finding, as a result of further studies by the present inventors, it has been found that by using an electromagnetic steel sheet (non-oriented electromagnetic steel sheet) enriched in the {111}<211> orientation as the core material of the rotor of a PM (Permanent Magnet) motor, the anisotropy of the elongation deformation of the steel sheet of the core material of the rotor with respect to the centrifugal force during rotation of the rotor can be suppressed, and noise can be reduced. Generally, since the {111}<211> orientation is difficult to magnetize, its use as a core material for motors is avoided. However, for the core material of the rotor of a PM motor that ensures magnetization with a permanent magnet, the application of an electromagnetic steel sheet enriched in the {111}<211> orientation does not pose a major disadvantage. On the other hand, it is disadvantageous to use an electromagnetic steel sheet enriched in the {111}<211> orientation as the core material of the stator that ensures magnetization for generating motor torque by magnetization of the core material. Therefore, the present inventors decided to use an electromagnetic steel sheet (non-oriented electromagnetic steel sheet) enriched in the {411}<011> orientation with excellent magnetic properties as the core material of the stator. By using electromagnetic steel sheets enriched in different orientations for the core material of the rotor and the core material of the stator respectively, it has been found that in a rotating electrical machine obtained by using these as materials, it is possible to achieve both low noise and high torque. Here, {lmn} <uvw>represents the crystal orientation. {lmn} refers to the Miller indices of the direction parallel to the normal direction of the rolling plane, <uvw>refers to the Miller index in the direction parallel to the rolling direction in the electromagnetic steel sheet manufacturing process. Further, since the present invention controls the rotational torque fluctuation caused by the in-plane anisotropy of the characteristics of the electromagnetic steel sheet, it is defined including the integrated orientation strength in the rolling direction.

[0009] In order to solve the above problems, the gist of the present invention is as follows. [1] A rotating electrical machine according to one aspect of the present invention includes a stator, a rotor, and a housing that houses the stator and the rotor. A, which is the {111}<211> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator, is less than 15. B, which is the {111}<211> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor, is 2 to 30, and A and B satisfy the relationship B / A > 1.0. C, which is the {411}<011> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator, is 2 to 50. D, which is the {411}<011> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor, is 1 to 40, and C and D satisfy the relationship C / D > 1.0. The base steel sheets of the non-oriented electromagnetic steel sheets included in the rotor and the stator each have a chemical composition including, by mass%, C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, and the balance being Fe and impurities. [2] In the rotating electrical machine according to [1] above, in the non-oriented electromagnetic steel sheet included in the rotor, B and E, which is the {111}<011> orientation strength, may satisfy the relationship B / E > 1.0. [3] In the rotating electrical machine described in [1] or [2] above, in the non-oriented electromagnetic steel sheet included in the stator, C and F which is the {100}<011> orientation strength may satisfy the relationship of C / F > 1.0. [4] In the rotating electrical machine according to any one of [1] to [3] above, the difference in the total of the Si content, Mn content, and sol.Al content in the base steel sheet between the non-oriented electromagnetic steel sheet included in the stator and the non-oriented electromagnetic steel sheet included in the rotor is within 0.20 mass%, and the average crystal grain size of the non-oriented electromagnetic steel sheet included in the stator may be larger than the average crystal grain size of the non-oriented electromagnetic steel sheet included in the rotor. [5] In the rotating electrical machine according to any one of [1] to [4] above, the Si content, Ti content, and Nb content of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator are represented by Si s , Ti s , Nb s respectively, and the Si content, Ti content, and Nb content of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor are represented by Si r , Ti r , Nb r respectively. When this is the case, any one of Si s / Si r > 1.0, Ti r / Ti s > 1.0, Nb r / Nb s > 1.0 may be satisfied. [6] In the rotating electrical machine according to any one of [1] to [5] above, the Nb content, Zr content, Ti content, V content, C content, and N content of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator are represented by Nb s , Zr s , Ti s , V s , C s , N s respectively. When this is the case, 0 ≧ Nb s / 93 + Zr s / 91 + Ti s / 48 + V s / 51 - (C s / 12 + N s / 14) may be satisfied. [7] The rotating electrical machine according to any one of [1] to [6] above has the Nb content, Zr content, Ti content, V content, C content, and N content of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor, in mass%, as Nb r , Zr r , Ti r , V r , C r , N r When taking as such, 0 < Nb r / 93 + Zr r / 91 + Ti r / 48 + V r / 51 - (C r / 12 + N r / 14) < 5.0×10 -3 may be satisfied. [8] The non-oriented electromagnetic steel sheet according to another aspect of the present invention includes a base steel plate and an insulating film formed on the surface of the base steel plate. The base steel plate has, in mass%, C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, and the balance consists of Fe and impurities. In the base steel plate, the {111}<211> orientation intensity is less than 15, and the {411}<011> orientation intensity is 2 to 50. [9] The non-oriented electromagnetic steel sheet according to another aspect of the present invention includes a base steel sheet and an insulating film formed on the surface of the base steel sheet. The base steel sheet has a chemical composition in mass% of C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, with the balance being Fe and impurities. In the base steel sheet, the {111}<211> orientation intensity is 2 to 30, and the {411}<011> orientation intensity is 1 to 40.

[10] The laminated core according to another aspect of the present invention is formed by laminating the non-oriented electromagnetic steel sheet described in [8] above.

[11] The laminated core according to another aspect of the present invention is formed by laminating the non-oriented electromagnetic steel sheet described in [9] above.

[12] The rotating electrical machine according to any one of [1] to [7] above may be such that the non-oriented electromagnetic steel sheet included in the stator is a steel sheet obtained by further heat-treating the non-oriented electromagnetic steel sheet included in the rotor at 600 °C or higher.

[13] The method for manufacturing a laminated core according to another aspect of the present invention includes a step of processing and laminating the non-oriented electromagnetic steel sheet described in [8] above.

[14] The method for manufacturing a laminated core according to another aspect of the present invention includes a step of processing and laminating the non-oriented electromagnetic steel sheet described in [9] above.

[15] The method for manufacturing a rotating electrical machine according to another aspect of the present invention includes a step of assembling the laminated core described in

[10] above and the laminated core described in

[11] above.

Advantages of the Invention

[0010] According to the above aspect of the present invention, there can be provided a rotating electrical machine that realizes both low noise and high torque required for an automotive drive motor, a rotor of such a rotating electrical machine, a non-oriented electrical steel sheet suitable as a material for a stator, and a laminated core formed by laminating non-oriented electrical steel sheets, which is preferably used for a stator or a rotor of a rotating electrical machine. That is, the rotating electrical machine according to the above aspect of the present invention reduces the anisotropy of the Young's modulus in the in-plane direction by using an electrical steel sheet enriched with the {111}<211> orientation as the rotor core material, and suppresses the anisotropy of the deformation of the rotor core material in the radial direction due to the centrifugal force during rotor rotation, thereby making the gap between the stator and the rotor constant and suppressing motor noise. Further, by using an electrical steel sheet enriched with the {411}<011> orientation as the core material of the stator, the torque of the motor can be increased. Therefore, the rotating electrical machine according to the above aspect of the present invention can achieve both low noise and high torque.

Brief Description of the Drawings

[0011]

Figure 1

Embodiments for Carrying Out the Invention

[0012] Hereinafter, a rotating electrical machine according to an embodiment of the present invention (the rotating electrical machine according to this embodiment), a non-oriented electrical steel sheet according to an embodiment of the present invention (the non-oriented electrical steel sheet according to this embodiment), a laminated core according to an embodiment of the present invention (the laminated core according to this embodiment), and manufacturing methods thereof will be described. Unless otherwise specified, the notation "a~b" for numerical values a and b means "a or more and b or less". In such notation, when a unit is attached only to numerical value b, the unit shall also apply to numerical value a.

[0013] [Rotating Electrical Machine] [Non-Oriented Electrical Steel Sheet] The rotating electrical machine according to this embodiment has the following configuration. It has a stator, a rotor, and a housing that houses the stator and the rotor. A, which is the {111}<211> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator, is less than 15, B, which is the {111}<211> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor, is 2 to 30, and A and B satisfy the relationship B / A > 1.0. C, which is the {411}<011> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator, is 2 to 50, D, which is the {411}<011> orientation strength of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor, is 1 to 40, and C and D satisfy the relationship C / D > 1.0. The base steel sheets of the non-oriented electromagnetic steel sheet included in the rotor and the non-oriented electromagnetic steel sheet included in the stator each in mass %, contain C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, and the balance consists of Fe and impurities, and has a chemical composition. Among them, the non-oriented electromagnetic steel sheet included in the rotor (which is the rotor core material) and the non-oriented electromagnetic steel sheet included in the stator (which is the stator core material) are each the non-oriented electromagnetic steel sheet according to this embodiment.

[0014] The rotating electrical machine according to this embodiment has at least a stator, a rotor, and a housing that houses the stator and the rotor. The stator, rotor, and housing are not particularly limited with respect to their shapes and configurations, and have normal shapes and configurations.

[0015] <Non-oriented electromagnetic steel sheet> The non-oriented electromagnetic steel sheet according to this embodiment includes a base metal steel sheet and an insulating film formed on the surface of the base metal steel sheet. Among these, the non-oriented electromagnetic steel sheet according to this embodiment has particularly large characteristics in the chemical composition and the texture (orientation intensity in each direction) of the base metal steel sheet.

[0016] [Orientation intensity in each direction of the base metal steel sheet] The {111}<211> orientation intensity of the base metal steel sheet of the non-oriented electromagnetic steel sheet mainly represents the integrated intensity of the {111} orientation in which the anisotropy of the Young's modulus in the in-plane direction of the plate surface is relatively small. Considering the reduction of the anisotropy in the in-plane direction caused by the crystal orientation, it is considered preferable to ideally have a completely random texture. Or, even if it is not completely random, it is strongly integrated in a specific plane orientation, and the integration into the in-plane orientation related to that plane orientation is made random. For example, in the {100}<0vw> orientation, the integrated intensity for v and w is made uniform. Even in the {111} orientation, it is considered preferable to make the change in the integrated intensity in the in-plane direction small and random. However, in an electromagnetic steel sheet manufactured through general casting, rolling, and annealing (heat treatment), it is inevitable that there is a certain degree of integration in a specific orientation in the base metal steel sheet, and it is difficult to achieve the ideal randomization as described above. Against this background, in the non-oriented electromagnetic steel sheet (the non-oriented electromagnetic steel sheet according to this embodiment) included in the rotor and stator of the rotating electrical machine according to this embodiment, the {111}<211> orientation intensity of the base metal steel sheet is an orientation that should be surely controlled as intended in a general electromagnetic steel sheet, and is very effective as one of the indicators for achieving the suppression of the anisotropy of the Young's modulus in the in-plane direction. Furthermore, the {111}<211> orientation intensity is also an effective indicator for evaluating the magnetic properties in the core material of the stator. In this embodiment, this orientation is used as one of the regulations for obtaining the effect. In addition, the {411}<011> orientation intensity of the base steel sheet of the electromagnetic steel sheet mainly indicates that the easy magnetization axis is close to the in-plane direction, and thus the magnetic properties are excellent. Here, the easy magnetization axis is the direction in which magnetization is easiest among the magnetic anisotropies of the crystal, and in a crystal with a bcc structure, it refers to the edge direction (

[0100] ,

[0010] ,

[0001] directions). Therefore, in this embodiment, this orientation is also used as one of the regulations for obtaining the effect. In this specification, when simply expressing the orientation intensity of the base steel sheet of the electromagnetic steel sheet as the orientation intensity of the electromagnetic steel sheet (non-oriented electromagnetic steel sheet), even in that case, it means the orientation intensity of the base steel sheet.

[0017] In this specification, the "orientation intensity" indicates how many times the diffraction intensity is compared to the case where the crystal orientation is random. That is, for example, the {111}<211> orientation intensity indicates how many times the diffraction intensity of the {111}<211> orientation is compared to the case where the crystal orientation is random when measured by EBSD. There are various methods for measuring the crystal orientation intensity. For the measurement of the {111}<211> orientation intensity and the {411}<011> orientation intensity, first, the rolling surface is polished so that the center of the thickness of the base steel sheet of the non-oriented electromagnetic steel sheet, which is the core material of the stator and the core material of the rotor, is exposed, and the polished surface is observed in an area of 960000 μm 2 using EBSD (Electron Back Scattering Diffraction). 2 Observation is sufficient as long as the total area is 960000 μm or more. For example, observation may be performed in a range of 800 μm × 1200 μm or more. If the measurement magnification cannot cover the entire field of view within that range, it may be performed at several locations divided into several small sections. For example, an area of 200 μm × 600 μm or more may be observed at eight or more locations. It is preferable that the step interval during measurement is 1 μm. The upper limit of the step interval is 1 / 10 of the average crystal grain size.

[0018] The procedure for obtaining the {111}<211> orientation intensity and the {411}<011> orientation intensity from the EBSD observation data is shown below. As described above, an area of 960,000 μm 2 or more is observed, and at least 100 crystal grains are observed. The observation data is analyzed using the OIM Analysis software (manufactured by TSL) to create an ODF (Orientation Distribution Function), and the {111}<211> orientation intensity and the {411}<011> orientation intensity are obtained from its values.

[0019] In the rotating electrical machine according to this embodiment, the {111}<211> orientation intensity (A) of the base steel sheet of the non-oriented electrical steel sheet that is the core material of the stator is in the range of less than 15. When the {111}<211> orientation intensity (A) exceeds 15, the magnetic properties deteriorate. The range of the {111}<211> orientation intensity (A) is preferably 1 to 3.

[0020] In the rotating electrical machine according to this embodiment, the {111}<211> orientation intensity (B) of the base steel sheet of the non-oriented electrical steel sheet that is the core material of the rotor is in the range of 2 to 30. When the {111}<211> orientation intensity (B) is less than 2, the in-plane anisotropy of the Young's modulus increases, and the noise when rotating becomes large. On the other hand, when the {111}<211> orientation intensity (B) exceeds 30, the magnetic permeability becomes small, so the motor efficiency decreases. The range of the orientation intensity (B) is preferably 10 to 30.

[0021] In the rotating electrical machine according to the present embodiment, the non-oriented electromagnetic steel sheet that is the core material of the stator and the non-oriented electromagnetic steel sheet that is the core material of the rotor each have the {111}<211> orientation strength of the base steel sheet within the above range, and at the same time, it is necessary that A and B, which are the respective orientation strengths, satisfy the relationship of B / A > 1.0. When A and B are in the relationship of B / A > 1.0, it is possible to achieve both reduction of losses generated in the stator core that is easily affected by the magnetic characteristics of the core material and reduction of noise generated in the rotor core that is easily affected by deformation due to centrifugal force during rotation, and the motor characteristics become good. Preferably, B / A > 1.1, more preferably, B / A > 1.2. Conversely, when A and B are in the relationship of B / A ≤ 1.0, it means that an electromagnetic steel sheet that is disadvantageous in terms of deformation against centrifugal force is applied as the rotor core material, and an electromagnetic steel sheet that is disadvantageous in terms of magnetic characteristics is applied as the stator core material, resulting in an increase in motor losses.

[0022] Furthermore, in the rotating electrical machine according to the present embodiment, the {411}<011> orientation strength (C) of the base steel sheet of the non-oriented electromagnetic steel sheet that is the core material of the stator is in the range of 2 to 50. When the orientation strength (C) is less than 2, the magnetic characteristics deteriorate and the motor characteristics deteriorate. On the other hand, when the {411}<011> orientation strength (C) exceeds 50, manufacturing becomes difficult. The range of the orientation strength (C) is preferably 5 to 30.

[0023] In the rotating electrical machine according to the present embodiment, the {411}<011> orientation strength (D) of the base steel sheet of the non-oriented electromagnetic steel sheet that is the core material of the rotor is 1 to 40. When the {411}<011> orientation strength (D) exceeds 40, the in-plane anisotropy of the Young's modulus becomes strong and the noise increases. On the other hand, when the orientation strength (D) is less than 1, heat is easily generated inside the rotor, the permanent magnet may be demagnetized, and the characteristics of the motor may deteriorate. The range of the {411}<011> orientation strength (D) is preferably 3 to 20.

[0024] In the rotating electrical machine according to this embodiment, for the stator core material and the rotor core material (non-oriented electrical steel sheet), the base metal steel sheet has the above-mentioned {411}<011> orientation strength range, and at the same time, for the respective orientation strengths C and D, it is necessary that the relationship C / D > 1.0 is satisfied. When C and D are in the relationship of C / D > 1.0, it is possible to achieve both an improvement in the magnetic characteristics of the stator core, which is easily affected by the magnetic characteristics of the core material, and a reduction in the noise generated in the rotor core, which is easily affected by the deformation due to the centrifugal force accompanying rotation. Preferably, C / D > 1.1, and more preferably, C / D > 1.2. Conversely, when C and D are in the relationship of C / D ≤ 1.0, an electrical steel sheet that is disadvantageous in terms of deformation against centrifugal force is used as the rotor core material, and an electrical steel sheet that is disadvantageous in terms of magnetic characteristics is used as the stator core material, resulting in an increase in motor loss.

[0025] Here, the orientation strengths of the base metal steel sheets of the stator, rotor, and respective core materials (non-oriented electrical steel sheets) will be described. The {111}<211> orientation strength and the {411}<011> orientation strength defined in this embodiment are generally in a trade-off relationship. For example, as a characteristic, the {111}<211> orientation is an unfavorable orientation for magnetic characteristics, and {411}<011> is a favorable orientation. Therefore, in this embodiment, for the non-oriented electrical steel sheet that is the stator core material, control is performed to weaken the {111}<211> orientation strength and at the same time strengthen the {411}<011> orientation strength. Also, in terms of metallurgy, in the change of the grain structure in the steel sheet manufacturing process by cold rolling and annealing (recrystallization), for example, depending on the change in the reduction ratio of cold rolling or the change in the annealing temperature, a situation where an increase in the {111}<211> orientation is accompanied by a decrease in the {411}<011> orientation, or a situation where an increase in the {411}<011> orientation is accompanied by a decrease in the {111}<211> orientation is observed. Against such a background, in this embodiment, for example, in a non-oriented electrical steel sheet which is a stator core material, as a result of controlling to weaken the {111}<211> orientation strength (A) of the base steel sheet and increase the {411}<011> orientation strength (C), for the stator core material, A / C < 1.0 is likely to hold. Viewed conversely, for the stator core material, it is preferable to satisfy A / C < 1.0. More preferably, A / C < 0.8, and even more preferably, A / C < 0.6.

[0026] Similarly, in a non-oriented electrical steel sheet which is a rotor core material, as a result of controlling to strengthen the {111}<211> orientation strength (B) of the base steel sheet and weaken the {411}<011> orientation strength (D), for the rotor core material, B / D > 1.0 is likely to hold. Viewed conversely, for the rotor core material, it is preferable to satisfy B / D > 1.0. More preferably, B / D > 1.5, and even more preferably, B / D > 2.0.

[0027] However, just to be clear, the above-mentioned "trade-off relationship" does not mean that it will necessarily be realized in principle. It means that in many cases, a trade-off relationship will occur on the premise of the steel sheet manufacturing process by cold rolling and annealing (recrystallization) and the magnetic properties required for the electrical steel sheet. That is, for example, it does not deny the phenomenon that the {111}<211> orientation and the {411}<011> orientation increase or decrease simultaneously.

[0028] Regarding the reason for the reduction of motor noise when the {111}<211> orientation strengths (A), (B), the {411}<011> orientation strengths (C), (D) of the base steel sheets of the stator core material and the rotor core material respectively satisfy the relationships of B / A > 1.0 and C / D > 1.0, it can be considered as follows, for example. As described above, since the {411}<011> orientation is a favorable orientation for magnetic properties, conventional electromagnetic steel sheets for motors have been controlled to enhance the strength in this orientation. However, because this orientation has a large in-plane anisotropy of Young's modulus, when an electromagnetic steel sheet with a high {411}<011> orientation strength is used as the core material of the rotor, it deforms anisotropically with respect to the rotation axis during rotation, resulting in vibration and increased noise. Like the rotating electrical machine according to this embodiment, a non-oriented electromagnetic steel sheet with a high {411}<011> orientation strength is used only as the core material of the stator. For the core material of the rotor, a non-oriented electromagnetic steel sheet with a relatively low {411}<011> orientation strength and an enhanced {111}<211> orientation strength with a small in-plane anisotropy of Young's modulus is used. As a result, the deformation during rotation becomes isotropic with respect to the rotation axis, suppressing vibration and reducing noise.

[0029] The non-oriented electromagnetic steel sheet, which is the core material of the rotor of the rotating electrical machine according to this embodiment, preferably further satisfies the relationship of B / E > 1.0 for the {111}<211> orientation strength (B) and the {111}<011> orientation strength (E).

[0030] In this embodiment, the {411}<011> orientation with a large in-plane anisotropy and the {111}<211> orientation with a small in-plane anisotropy are controlled. Regarding the {111} orientation, in addition to the {111}<211> orientation, the {111}<011> orientation is likely to develop. Considering the overall influence on the in-plane anisotropy of these orientations, for the {111} orientation, the {111}<011> orientation having the same in-plane orientation <011> as the {410}<011> orientation is disadvantageous for reducing the overall in-plane anisotropy compared to the {111}<211> orientation. From this perspective, in the rotating electrical machine according to this embodiment, it is preferable that B / E > 1.0 for the non-oriented electromagnetic steel sheet included in the rotor. More preferably, B / E > 1.5, and even more preferably, B / E > 2.0.

[0031] In the rotating electrical machine according to this embodiment, for the non-oriented electrical steel sheet which is the core material of the stator, it is preferable that the {411}<011> plane orientation strength (C) of the base steel sheet and the {100}<011> plane orientation strength (F) of the base steel sheet satisfy the relationship of C / F > 1.0. The {100}<011> plane orientation has a high increase in iron loss with respect to compressive stress. There are several methods for fixing the stator, and most of them apply compressive stress to the core of the stator. Therefore, it is better to increase the proportion of {411}<011> with low compressive stress sensitivity. More preferably, C / F > 1.5, and even more preferably, C / F > 2.0.

[0032] [Chemical Composition] For the non-oriented electrical steel sheet which is the core material of the stator and the non-oriented electrical steel sheet which is the core material of the rotor in the rotating electrical machine according to this embodiment, the chemical composition of the base steel sheet preferably has the following chemical compositions respectively, assuming that the core material of the stator and the core material of the rotor that satisfy the respective plane orientation strength requirements can be obtained from the manufactured non-oriented electrical steel sheet. "%" in the description of the chemical composition means "mass %". In the rotating electrical machine according to this embodiment, the chemical composition of the base steel sheet of the non-oriented electrical steel sheet which is the core material of the stator and the non-oriented electrical steel sheet which is the core material of the rotor may be the same, but as described later, they may also be different.

[0033] (C: 0.0100% or less) C is an element that increases iron loss and causes magnetic aging. Therefore, the lower the C content, the better. Such a phenomenon is remarkable when the C content exceeds 0.0100%. For this reason, the C content is set to 0.0100% or less. The reduction of the C content also contributes to the uniform improvement of magnetic properties in all directions within the sheet surface. The lower limit of the C content is not particularly limited, but considering the cost of decarburization treatment during refining, it is preferably 0.0005% or more.

[0034] (Si: 0.5000 - 4.0000%) Si is an element that increases electrical resistance, reduces eddy current loss, reduces iron loss, or increases the yield ratio to improve the punching processability of the core. If the Si content is less than 0.5000%, these effects cannot be fully obtained. Therefore, the Si content should be 0.5000% or more. The Si content is preferably 0.9000% or more, and more preferably 1.5000% or more. On the other hand, if the Si content exceeds 4.0000%, the magnetic flux density decreases, the punching processability deteriorates due to an excessive increase in hardness, and cold rolling becomes difficult. Therefore, the Si content should be 4.0000% or less. Also, Si is an element contained in a relatively large amount in the electrical steel sheet, and has a great influence on cold rolling and the {111}<211> orientation and {411}<011> orientation after recrystallization annealing, which are mainly controlled in this embodiment. In low-Si steel, the {111}<211> orientation is likely to develop, and the {411}<011> orientation is likely to be suppressed. Therefore, it is preferable that the non-oriented electrical steel sheet used for the stator core material has a higher Si content in the base steel sheet than the non-oriented electrical steel sheet used for the rotor core material. In particular, the presence or absence of transformation due to the Si content in the steel sheet manufacturing process can be utilized for the control of the above-described aggregated structure. It is more preferable that the steel sheet used for the stator core material has a high-Si non-transformed chemical composition, and the steel sheet used for the rotor core material has a low-Si transformed chemical composition.

[0035] (sol.Al: 0.0001~1.0000%) Al is an element that increases electrical resistance, reduces eddy current loss, and reduces iron loss. Al also contributes to an improvement in the relative magnitude of the magnetic flux density B50 with respect to the saturation magnetic flux density. If the sol.Al (acid-soluble Al) content is less than 0.0001%, these effects cannot be fully obtained. In addition, Al has an effect of promoting desulfurization in steelmaking. Therefore, the sol.Al content should be 0.0001% or more. On the other hand, if the sol.Al content exceeds 1.0000%, the magnetic flux density decreases, the yield ratio decreases, and the punching processability deteriorates. Therefore, the sol.Al content should be 1.0000% or less.

[0036] Here, the magnetic flux density B50 is the magnetic flux density in a magnetic field of 5000 A / m.

[0037] (S: 0.0100% or less) S is not an essential element but an element contained as an impurity in, for example, steel. S precipitates as fine MnS, thereby inhibiting recrystallization and grain growth during annealing. Therefore, the lower the S content, the more preferable. The increase in iron loss and the decrease in magnetic flux density due to such inhibition of recrystallization and grain growth are significant when the S content exceeds 0.0100%. For this reason, the S content is set to 0.0100% or less. The lower limit of the S content is not particularly limited, but considering the cost of desulfurization treatment during refining, it is preferably 0.0003% or more.

[0038] (N: 0.0100% or less) Similar to C, N is an element that deteriorates magnetic properties. Therefore, the lower the N content, the more preferable. When the N content exceeds 0.0100%, its adverse effect becomes significant, so the N content is set to 0.0100% or less. The lower limit of the N content is not particularly limited, but considering the cost of denitrification treatment during refining, it is preferably 0.0010% or more.

[0039] (One or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, Au: a total of 0.1000 - 5.0000%) It is necessary to contain at least one or more of these elements, Mn, Ni, Co, Pt, Pb, Cu, Au, in a total amount of 0.1000% or more. Also, from the viewpoint of increasing electrical resistance and reducing iron loss, it is more preferable that the total amount of at least one or more of these elements is 0.2000% or more. Even more preferably, it is 1.0000% or more in total. On the other hand, when the total content of these elements exceeds 5.0000%, the cost becomes high and the magnetic flux density may decrease. Therefore, the total amount of at least one of these elements is 5.0000% or less. Preferably, it is 4.0000% or less.

[0040] (Cr: 0 to 2.0000%) Cr is an element that improves corrosion resistance, high-frequency characteristics, and the microstructure. Cr does not necessarily need to be contained, and the lower limit of the Cr content is 0%. The effect of Cr content can be obtained even in trace amounts, but in order to surely obtain the effect of containment, the content is preferably 0.0010% or more, more preferably 0.0020% or more, still more preferably 0.0200% or more, and even more preferably 0.1000% or more. On the other hand, when the Cr content exceeds 2.0000%, Cr forms carbonitrides, and these carbonitrides refine the crystal grain size and increase the iron loss. Therefore, the Cr content is 2.0000% or less.

[0041] (Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%) Sn and Sb are elements that improve the microstructure after cold rolling and recrystallization and improve the magnetic flux density. Therefore, these elements can be contained as needed. In order to improve magnetic properties and the like, it is preferable to contain one or more selected from the group consisting of 0.0200 to 0.4000% of Sn, 0.0200 to 0.4000% of Sb, and 0.0200 to 0.4000% of P. On the other hand, when Sn and Sb are contained in excess, the steel becomes brittle. Therefore, both the Sn content and the Sb content are 0.4000% or less. Also, P can be contained to ensure the hardness of the steel sheet after recrystallization, but when contained in excess, it causes embrittlement of the steel. Therefore, the P content is 0.4000% or less.

[0042] (Ti: 0 to 0.1000%, Nb: 0 to 0.1000%) Ti and Nb are elements that change the microstructure after cold rolling and recrystallization by fixing and reducing solid-solution C and solid-solution N as precipitates. It acts to increase the {111}<211> orientation intensity and decrease the {411}<011> orientation intensity by containment. In order to sufficiently obtain this effect, it is preferable to contain more than the equivalent of the C content and the N content. Generally, Ti and Nb are each preferably contained at 0.0200% or more, and more preferably 0.0400% or more. However, the Ti content and the Nb content shall both be 0.1000% or less. As described above, the content makes the {111}<211> orientation intensity increase and the {411}<011> orientation intensity decrease. Therefore, it is preferable to contain more Ti and Nb in the non-oriented electromagnetic steel sheet used as the core material of the rotor. However, as will be described later, when Ti and / or Nb is contained in an amount of 0.0100% or more, when performing the finish annealing process, sufficient characteristics cannot be obtained unless the heating rate of the finish annealing is increased to 100 °C / second or more. If such a heating rate is not achieved, it is not preferable in that the {411}<011> orientation does not develop. That is, when Ti and / or Nb is contained, the manufacturability decreases. Therefore, from this point, it is preferable that the Ti content is less than 0.0100% and the Nb content is less than 0.0100%. More preferably, the total of the Ti content, the Nb content, the V content, and the Zr content described later is less than 0.0100%.

[0043] Zr: 0 to 0.1000% V: 0 to 0.1000% In addition to the above elements, the chemical composition of the base steel sheet of the non-oriented electromagnetic steel sheet according to the present embodiment may further contain V and / or Zr as selected elements. Both Zr and V are elements that have the effect of suppressing recrystallization, increasing the {111}<211> orientation intensity, and decreasing the {411}<011> orientation intensity. When obtaining this effect, the Zr content and the V content are each preferably 0.0100% or more. On the other hand, when the Zr content and the V content exceed 0.1000%, the steel becomes brittle. Therefore, both the Zr content and the V content shall be 0.1000% or less. Preferably 0.0500% or less, more preferably less than 0.0100%.

[0044] In the rotating electrical machine according to the present embodiment, the Nb content, the Zr content, the Ti content, the V content, the C content, and the N content in terms of mass% of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator are Nb s , Zr s , Ti s , V s , C s , N s When it is, 0 ≧ Nb s / 93 + Zr s / 91 + Ti s / 48 + V s / 51 - (C s / 12 + N s / 14) is preferably satisfied. In this case, the effect that the {411}<011> azimuth intensity increases can be obtained. The lower limit is not particularly limited. For example, Nb s / 93 + Zr s / 91 + Ti s / 48 + V s / 51 - (C s / 12 + N s / 14) ≧ -1.55×10 -3 may be sufficient. Also, when the Nb content, Zr content, Ti content, V content, C content, and N content in terms of mass% of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor are respectively Nb r , Zr r , Ti r , V r , C r , N r when it is, 0 < Nb r / 93 + Zr r / 91 + Ti r / 48 + V r / 51 - (C r / 12 + N r / 14) < 5.0×10 -3 is preferably satisfied. In this case, the effect that the {111}<211> azimuth intensity increases can be obtained.

[0045] The balance of the chemical composition other than the above is Fe and impurities. In the present embodiment, impurities refer to elements that are mixed in from raw materials or in the manufacturing process and do not clearly affect the characteristics of the rotating electrical machine according to the present embodiment. Examples of impurities include, in addition to the elements described above, for example, B, O, Mg, Ca, Nd, Bi, W, Mo, Nb, and Y. The content of these elements is preferably, for example, 0.10% or less each. Further, the total content of all impurities is preferably 5.00% or less, and more preferably 1.00% or less.

[0046] In the rotating electrical machine according to this embodiment, the chemical composition of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator and the chemical composition of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor may be the same. However, considering the above effects, for Si, Ti, and Nb, the Si content, Ti content, and Nb content of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator are, in mass%, Si s , Ti s , Nb s respectively, and the Si content, Ti content, and Nb content of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor are, respectively, Si r , Ti r , Nb r respectively. When Si s / Si r > 1.0, Ti r / Ti s > 1.0, Nb r / Nb s > 1.0, it is preferable to satisfy any one of them. Si s / Si r > 1.0, Ti r / Ti s > 1.0, Nb r / Nb s > 1.0, when any one of them is satisfied, the effect that the motor loss is further reduced can be obtained.

[0047] In the rotating electrical machine according to this embodiment, the difference in the total of the Si content, Mn content, and sol.Al content in the base steel sheet between the non-oriented electromagnetic steel sheet included in the stator and the non-oriented electromagnetic steel sheet included in the rotor is preferably within 0.20 mass% (the absolute value of the difference is 0.20 mass% or less). In this case, including the case of manufacturing the stator and the rotor from the same material, there is an advantage that the working efficiency and cost can be reduced.

[0048] The chemical composition of the base steel plate is determined by the following method. The entire surface of the test piece is polished with a grinder or the like, washed with acetone, cut with a nibbler or the like to prepare a sample. C and S are measured by combustion-infrared absorption method. N is measured by inert gas fusion-thermal conductivity method. sol.Al is measured by acid dissolution-ICP emission spectrometry. O is measured by inert gas fusion-non-dispersive infrared absorption method. Other elements are measured by ICP emission spectrometry. Here, the surface insulating film may be removed by machining such as polishing as described above, or chemically removed using hot alkali. Also, in a rotating electrical machine, when determining the chemical composition of the base steel plate of the non-oriented electrical steel sheet included in the stator and the non-oriented electrical steel sheet included in the rotor, the non-oriented electrical steel sheet is taken out from the stator or the rotor by disassembling the rotating electrical machine, and then the chemical composition may be measured in the above manner. The detailed method of disassembling the rotating electrical machine varies depending on the actual rotating electrical machine. As an example, first, the rotating electrical machine is taken out from the machine in which the rotating electrical machine is installed. Then, a part of the housing (case) of the rotating electrical machine is removed by machining. And the stator and the rotor are separated. At this time, if there is a permanent magnet in the rotor, since a magnetic attraction force is generated, it is desirable to insert a spacer such as a plastic sheet between the stator and the rotor. Then the stator is removed from the housing. Since the stator has windings, the windings are removed or partially cut. The steel plate at the top of the stator lamination or the steel plate damaged when the windings are cut is excluded, and samples are taken from other locations. In many cases, the lamination is fastened by caulking or welding. In the case of caulking, the lamination can be peeled off by inserting the blade of a cutter into the gap between the laminated steel plates. In the case of welding, the lamination can be peeled off by cutting the welded part with a hand grinder or the like. The rotor often has coil ends made of materials other than electromagnetic steel sheets. Therefore, it is separated into two parts by machining using a non-magnetic blade near the longitudinal center of the rotor. After that, the lamination is peeled off in the same manner as the stator described above. In this case, it is desirable to exclude the portions affected by the machining.

[0049] [Average crystal grain size of the base steel sheet] In the rotating electrical machine according to this embodiment, it is preferable that the average crystal grain size of the base steel sheet of the non-oriented electromagnetic steel sheet included in the stator is larger than the average crystal grain size of the base steel sheet of the non-oriented electromagnetic steel sheet included in the rotor. In this case, the effect that the rotor has a larger {111}<211> orientation intensity and the stator has a larger {411}<011> orientation intensity can be obtained.

[0050] The average crystal grain size can be obtained by the following method. For the average crystal grain size, in the longitudinal section microstructure photograph, the average value of the crystal grain sizes measured by the cutting method in the plate thickness direction and the rolling direction may be used. As this longitudinal section microstructure photograph, an optical microscope photograph can be used. For example, a photograph taken at a magnification of 50 times may be used. In the plate thickness direction, it is good to draw 20 or more line segments of the total length of the plate thickness and count them. In the rolling direction, it is good to draw line segments of 2 mm in length parallel to 1 / 4, 1 / 2, and 3 / 4 of the plate thickness and count them. However, when including an unrecrystallized region, it may be calculated by the above method only for the recrystallized region.

[0051] Also, in the rotating electrical machine according to this embodiment, it is preferable that the non-oriented electromagnetic steel sheet included in the stator is a steel sheet obtained by further heat-treating the non-oriented electromagnetic steel sheet included in the rotor at 600°C or higher. In this case, by removing the strain introduced by processing, the magnetic properties are improved, and the effect that the motor characteristics are improved by improving the magnetic properties of the stator, which is easily affected by the magnetic properties of the core material, can be obtained.

[0052] [Thickness of the base steel sheet] Next, the thickness of the base steel sheet of the non-oriented electromagnetic steel sheet according to this embodiment will be described. The thickness of the base steel sheet of the non-oriented electromagnetic steel sheet according to this embodiment is not necessarily limited, but is preferably 0.50 mm or less. If the thickness exceeds 0.50 mm, it is difficult to obtain excellent high-frequency iron loss. Since it is advantageous for the sheet thickness to be thinner from the viewpoint of iron loss, it is preferably 0.35 mm or less, more preferably 0.20 mm or less, and still more preferably 0.15 mm or less. On the other hand, from the viewpoint of facilitating manufacturing, the thickness of the base steel sheet of the non-oriented electromagnetic steel sheet according to this embodiment is preferably 0.10 mm or more.

[0053] [Insulating film] In the non-oriented electromagnetic steel sheet according to this embodiment, an insulating film is formed on the surface of the base steel sheet. This insulating film may be a known film. For example, a film made of Al2O3 is exemplified.

[0054] [Laminated core] The laminated core according to this embodiment includes a base steel sheet and an insulating film formed on the surface of the base steel sheet. In the base steel sheet, by mass%, C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, and the balance consists of Fe and impurities. It has a chemical composition, and the {111}<211> orientation intensity is less than 15, and the {411}<011> orientation intensity is 2 to 50. It is a laminated core (stator core) formed by laminating non-oriented electromagnetic steel sheets (non-oriented electromagnetic steel sheets according to this embodiment), or it includes a base steel sheet and an insulating film formed on the surface of the base steel sheet. In the base steel sheet, by mass%, C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, and the balance consists of Fe and impurities. It has a chemical composition, and the {111}<211> orientation intensity is 2 to 30, and the {411}<011> orientation intensity is 1 to 40. It is a laminated core (rotor core) formed without laminating non-oriented electromagnetic steel sheets (non-oriented electromagnetic steel sheets according to this embodiment). The laminated core is manufactured by punching, laminating, and bonding the non-oriented electromagnetic steel sheet according to this embodiment. In this process, the chemical composition and the microstructure do not change. Therefore, the non-oriented electromagnetic steel sheet included in the laminated core has the same chemical composition and microstructure as the non-oriented electromagnetic steel sheet according to the above-described embodiment. As can be understood from this, the chemical composition and the microstructure of the laminated core described above are the chemical composition and the microstructure of the base steel plate of the non-oriented electromagnetic steel sheet. Further, by combining this stator core and rotor core, a motor core can be formed.

[0055] [Manufacturing method] A method for manufacturing a non-oriented electromagnetic steel sheet, a laminated core, and a rotating electrical machine according to the present embodiment will be described.

[0056] <Manufacturing method of non-oriented electromagnetic steel sheet> First, as a method for manufacturing a non-oriented electromagnetic steel sheet according to the present embodiment, a method for manufacturing a non-oriented electromagnetic steel sheet that is a core material of a rotor and a non-oriented electromagnetic steel sheet that is a core material of a stator will be described. A non-oriented electromagnetic steel sheet having a predetermined {111}<211> orientation intensity and {411}<011> orientation intensity (the non-oriented electromagnetic steel sheet that is a core material of a rotor and the non-oriented electromagnetic steel sheet that is a core material of a stator have different preferable ranges of orientation intensity) can be obtained by controlling various conditions in the manufacturing process.

[0057] As a first example, an example of a manufacturing method will be described in which, using slabs having the same chemical composition, the manufacturing conditions after hot rolling are changed to produce a non-oriented electromagnetic steel sheet preferable as a core material of a stator and a non-oriented electromagnetic steel sheet preferable as a core material of a rotor separately. The non-oriented electromagnetic steel sheet according to the present embodiment is manufactured by performing hot rolling and cold rolling, and further performing intermediate annealing, skin pass rolling, finish annealing, and stress relief annealing as necessary to manufacture a base steel plate, and by forming an insulating film on the surface of the base steel plate after any of the above-described processes. The non-oriented electromagnetic steel sheet having the specified {111}<211> orientation intensity and {411}<011> orientation intensity can be obtained by controlling various conditions in the manufacturing process, and the distinction between the non-oriented electromagnetic steel sheet preferable as the core material of the stator and the non-oriented electromagnetic steel sheet preferable as the core material of the rotor can be realized by the presence or absence of intermediate annealing, skin pass rolling, finish annealing, etc. Here, the intermediate annealing is annealing performed between cold rolling and skin pass rolling, and the finish annealing refers to annealing performed after skin pass rolling. This finish annealing may be performed by the steel sheet manufacturer or by the motor manufacturer (processing manufacturer) after punching the core.

[0058] First, a steel material having the above-described chemical composition is heated and hot-rolled. The steel material is, for example, a slab manufactured by ordinary continuous casting. The heating temperature of the steel material is not limited, but for example, standard conditions of 1000 to 1350 °C can be adopted. The rough rolling and finish rolling of the hot rolling are performed at a temperature of A r1 temperature or higher. That is, it is preferable to perform hot rolling so that the temperature at the time of passing through the final pass of the finish rolling (finish temperature) is A r1 temperature or higher. Thereby, the crystal structure is refined by transforming from austenite (γ iron) to ferrite (α iron) by subsequent cooling. When cold rolling is then performed in a state where the crystal structure is refined, bulging recrystallization (a phenomenon in which recrystallized grains grow so as to protrude with respect to the non-recrystallized portion, hereinafter may be referred to as "bulging") is likely to occur, and it is possible to easily grow crystal grains in the {411}<011> orientation that normally do not grow easily. In the non-oriented electromagnetic steel sheet according to the present embodiment, A r1 temperature is determined from the thermal expansion change of the steel material (base metal steel sheet) during cooling at an average cooling rate of 1 °C / second after heating to A c3 temperature. Further, in the steel sheet used in the present invention, A c1 temperature (temperature at which transformation to the γ phase occurs) is determined from the thermal expansion change of the steel material (steel sheet) during heating at an average heating rate of 1 °C / second. However, when the chemical composition is a non-transformed system, the finishing temperature is preferably 850°C or higher. The reason is that when the finishing temperature is less than 850°C, it becomes difficult to control the shape of the steel plate during hot rolling.

[0059] After that, it is wound up without performing hot-rolled plate annealing. If hot-rolled plate annealing is performed, the {411}<011> orientation cannot be enriched in the subsequent process. The temperature at the time of winding is not limited, but it is preferably above 250°C and below 700°C. By winding up the hot-rolled steel plate after hot rolling at a temperature above 250°C and below 700°C, the crystal structure before cold rolling can be refined, and the effect of enriching the {411}<011> orientation with excellent magnetic properties during recrystallization can be obtained. The winding temperature is more preferably 400 - 600°C, and even more preferably 400 - 480°C.

[0060] After that, through pickling, cold rolling is performed on the hot-rolled steel plate. In cold rolling, the reduction ratio is preferably 80.0 - 92.0%. The higher the reduction ratio, the easier the crystal grains of the {411}<011> orientation grow by subsequent recrystallization. On the other hand, when the reduction ratio exceeds 92.0%, the load in cold rolling increases, resulting in increased costs. The reduction ratio of cold rolling is determined in consideration of the skin pass rolling described later so that the required product plate thickness is obtained after skin pass rolling.

[0061] When cold rolling is completed, intermediate annealing is subsequently performed. Intermediate annealing may not be performed. When performing intermediate annealing, the temperature of intermediate annealing is controlled to be less than A c1 temperature to make the recrystallization rate 1 - 99%, preferably 50 - 99%. If the temperature of intermediate annealing is too low, there is a concern that bulging will not occur sufficiently and the crystal grains of the {411}<011> orientation will not grow sufficiently. Therefore, the temperature of intermediate annealing is preferably 600°C or higher. Also, when the temperature of intermediate annealing becomes higher than A c1 temperature, austenite transformation occurs during annealing, increasing the occurrence frequency of crystal grains having crystal orientations other than the {411}<011> orientation, and there is a concern that the invention effect will be impaired. Therefore, intermediate annealing is A c1 It is carried out at a temperature below [a certain value]. When the chemical composition is a non-transforming system, the intermediate annealing temperature should be 800 °C or lower. The time for such intermediate annealing is preferably 5 to 60 seconds.

[0062] The recrystallization ratio is preferably 50% or more at the time after intermediate annealing, from the viewpoint that {411}<011> orientation grains are more likely to grow after finish annealing or stress-relief annealing.

[0063] The recrystallization ratio of the steel sheet after intermediate annealing (the cold-rolled steel sheet that becomes the base steel sheet of the non-oriented electrical steel sheet) can be specified by the following procedure. First, a sample taken from the steel sheet is polished from the surface so that the plate thickness becomes 1 / 2 (so that the center of the plate thickness is exposed), and the polished surface is observed by the electron backscatter diffraction (EBSD) method. Then, grains that satisfy any one of the following conditions (a) and (b) are determined as the non-recrystallized part, and the non-recrystallization ratio = the area of the non-recrystallized part / the area of the entire observation field of view is calculated. (a) Grains with a grain size of more than 300 μm. (b) Grains with an aspect ratio of more than 2, that is, (length in the rolling direction) / (length in the direction 90 degrees from the rolling direction) > 2.

[0064] When the intermediate annealing is completed, next, skin pass rolling is performed. Skin pass rolling may not be performed. Also, when intermediate annealing is not performed, skin pass rolling is performed after cold rolling. By performing skin pass rolling, the {111}<211> orientation intensity increases, and it becomes a non-oriented electrical steel sheet suitable as a core material for a rotor.

[0065] The reduction ratio of skin pass rolling can be determined within a suitable range assuming that the steel sheet obtained by subjecting the steel sheet subjected to skin pass rolling to finish annealing as described later is used as the core material of the stator. As described above, when mild rolling is performed on the steel sheet in which bulging has occurred and further annealing is performed, the {411}<011> orientation crystal grains generated by bulging further grow. This is an example of a phenomenon generally known as strain-induced grain boundary migration (hereinafter sometimes referred to as SIBM). In order to utilize this phenomenon, the reduction ratio of skin pass rolling is set to 5 to 25%. If the reduction ratio of skin pass rolling is less than 5%, the amount of strain accumulated in the steel sheet is small, so SIBM does not occur. On the other hand, if the reduction ratio of skin pass rolling exceeds 25%, the strain is too large, so recrystallization nucleation occurs instead of SIBM. In nucleation, the generation frequency of {111}<211> crystal grains increases. Therefore, if this steel sheet is used as the core material of the stator, the magnetic characteristics of the stator will deteriorate. From the viewpoint of sufficiently obtaining the effect in this regard, it is more preferable that the reduction ratio of skin pass rolling is 5 to 15%. Further, when the reduction ratio of cold rolling is Rm (%) and the reduction ratio of skin pass rolling is Rs (%), the reduction ratios of cold rolling and skin pass rolling are preferably adjusted so as to satisfy 86 < Rm + 0.2×Rs < 92 and 5 < Rs < 20.

[0066] Subsequently, finish annealing is performed on the steel sheet after skin pass rolling. Finish annealing may not be performed. When intermediate annealing or skin pass rolling is not performed, finish annealing is performed on the steel sheet after cold rolling or after intermediate annealing. When obtaining the effect of finish annealing, it is preferable to perform finish annealing on the steel sheet after skin pass rolling. In this case, by finish annealing, the strain imparted by skin pass rolling can be released, and recrystallization due to SIBM can be carried out at a temperature and time. The higher the annealing temperature, the shorter the treatment time can be. However, the α→γ transformation should be avoided, and the upper limit of the temperature is preferably less than the A c1 temperature. Specifically, the temperature is preferably 600 to A c1 Less than °C, as time, it can be exemplified as more than 0 seconds and 100 hours or less. For a general continuous annealing furnace, 700~A c1 Less than °C, 1 to 300 seconds. For a batch annealing furnace, 600~A c1 Less than °C, 20 to 1200 minutes can be exemplified. By appropriately controlling the holding temperature and time, the strain introduced by skin pass rolling can be sufficiently released by SIBM, the warping during punching into a complex shape can be suppressed, and at the same time, excessive coarsening of crystal grains can be avoided, and the decrease in punching accuracy due to sagging during punching can be suppressed, that is, the workability of the non-oriented electrical steel sheet can be improved. When skin pass rolling is not performed, since the strain can be sufficiently released by finish annealing, the workability does not deteriorate in the first place. After finish annealing, the steel sheet has a high {411}<011> orientation intensity, so it becomes a non-oriented electrical steel sheet suitable as a core material for a stator. The heating rate of finish annealing is preferably 30°C / second or more in terms of increasing the {411}<011> orientation intensity. More preferably, it is 100°C / second or more, or 200°C / second or more. Also, it may be 300°C / second or more, further, 400°C / second or more, or 500°C / second or more. In particular, when the base steel sheet contains a total of 0.010% or more of Ti, Nb, V, or Zr, if the heating rate of finish annealing is less than 100°C / second, the effect of decreasing the {411}<011> orientation intensity is significant, so the heating rate is preferably 100°C / second or more.

[0067] In general stress relief annealing, even if stress relief annealing is only applied to the stator, the {411}<011> orientation intensity does not increase much, while the {111}<011> orientation intensity increases. Therefore, for the {111}<211> orientation intensity (A) of the core material of the target stator and the {111}<211> orientation intensity (B) of the core material of the rotor, it is difficult to satisfy the relationship of B / A > 1.0, and for the {411}<011> orientation intensity (C) of the core material of the stator and the {411}<011> orientation intensity (D) of the core material of the rotor, it is difficult to satisfy the relationship of C / D > 1.0. On the other hand, in the above method utilizing bulging and SIBM, by annealing only the stator, the {411}<011> orientation grows by encroaching on the {111}<211> orientation, which is very advantageous for satisfying the target relationships of B / A > 1.0 and C / D > 1.0.

[0068] When the non-oriented electromagnetic steel sheet according to this embodiment is used as a motor core, for a desired core member shape, forming processes such as punching may be performed. And in order to remove the strain and the like generated by the forming processes, stress relief annealing may be performed. The above finish annealing may be executed as stress relief annealing of the stator core. It is preferable that the temperature of the stress relief annealing is about 800 °C and the time of the stress relief annealing is about 2 hours.

[0069] The non-oriented electromagnetic steel sheet according to this embodiment forms an insulating film on the surface of the base steel sheet before or after stress relief annealing after the last process among cold rolling, intermediate annealing, skin pass rolling, and finish annealing. As the conditions for forming the insulating film, the same conditions as those for forming the insulating film of the conventional non-oriented electromagnetic steel sheet may be adopted.

[0070] As another example of differentiating between the non-oriented electrical steel sheet that is the core material of the rotor and the hot-rolled non-oriented electrical steel sheet that is the core material of the stator, after performing hot rolling, cold rolling, intermediate annealing, and skin pass rolling on a slab having the same chemical composition under the same conditions (as the same sheet), a method of differentiating based on whether finish annealing or stress relief annealing is performed can be mentioned. In this method, the steel sheet that has been processed up to the skin pass process is manufactured and shipped by the steel sheet manufacturer, and then, at the motor manufacturer (processing manufacturer), the core material of the rotor and the core material of the stator are punched out from the same steel sheet (generally also referred to as integral punching, etc.). The rotor core is used without performing stress relief annealing, and the stator core is used after performing stress relief annealing, whereby the rotating electrical machine of the present invention can be manufactured. Since the core material of the rotor and the core material of the stator are differentiated by stress relief annealing, which is the final stage of motor core manufacturing, it is convenient in terms of logistics, steel sheet handling, and steel sheet yield, and can be said to be a very preferable method industrially. That is, for example, the non-oriented electrical steel sheet included in the stator may be a steel sheet obtained by further performing heat treatment (finish annealing or stress relief annealing) at 600°C or higher on the non-oriented electrical steel sheet included in the rotor. As described above, a core material applicable to the rotating electrical machine according to the present embodiment can be obtained.

[0071] The non-oriented electrical steel sheet that is the core material of the rotor and the hot-rolled non-oriented electrical steel sheet that is the core material of the stator of the rotating electrical machine according to the present embodiment may be obtained by differentiating them by a method other than the above. For example, they may be manufactured using steel materials having different chemical compositions, or differentiation may also be possible depending on hot rolling conditions, cold rolling conditions, and the like.

[0072] Regarding conditions not described above, known conditions can be appropriately adopted.

[0073] The electromagnetic steel sheet (non-oriented electromagnetic steel sheet) manufactured in this way is a suitable electromagnetic steel sheet as the core material of the stator or the core material of the rotor of the rotating electrical machine according to this embodiment. Basically, a steel sheet manufactured so as to suppress the aggregation in the {111}<211> orientation and promote the aggregation in the {411}<011> orientation is a suitable electromagnetic steel sheet as the core material of the stator, and a steel sheet manufactured so as to promote the aggregation in the {111}<211> orientation is a suitable electromagnetic steel sheet as the core material of the rotor. Furthermore, when stress-relieving annealing the core of the motor, a steel sheet considering the change in crystal orientation due to stress-relieving annealing can be applied. And by selecting and using the steel sheet so that the orientation strengths (A), (B), (C), (D), (E), and (F) of each core material satisfy a predetermined relationship, the rotating electrical machine according to this embodiment can be obtained. The method of using two types of steel sheets with different aggregate structures created by chemical composition, hot rolling conditions, hot rolled sheet heat treatment conditions, cold rolling conditions, finish annealing conditions, etc. as the core material of the stator or the core material of the rotor respectively does not become so-called integral punching. It is necessary to consider that it may be disadvantageous in terms of steel sheet yield compared to the method of punching the core material of the stator and the core material of the rotor from the above-mentioned one type of steel sheet. However, since the aggregate structure of each steel sheet can be completely independently controlled, if the steel sheet is appropriately selected, it will be advantageous in terms of the magnitude of the effect.

[0074] <Manufacturing method of laminated core> The laminated core according to this embodiment is manufactured by using, as the material of the stator core, a non-oriented electromagnetic steel sheet in which the {111}<211> orientation strength is less than 15 and the {411}<011> orientation strength is 2 to 50 among the non-oriented electromagnetic steel sheets according to this embodiment described above, or by using, as the material of the rotor core, a non-oriented electromagnetic steel sheet in which the {111}<211> orientation strength is 2 to 30 and the {411}<011> orientation strength is 1 to 40. Specifically, different non-oriented electromagnetic steel sheets are prepared for the stator and the rotor, respectively processed by punching, and laminated. Alternatively, the stator and the rotor may be processed by punching and laminated using the same electromagnetic steel sheet, and stress relief annealing may be performed only on the stator. The punching and lamination may be performed by known methods.

[0075] <Manufacturing method of rotating electrical machine> The rotating electrical machine according to this embodiment is manufactured by winding a wire around the laminated core and placing it in a housing by a known method after manufacturing the above laminated core. At this time, the order of winding the wire and placing it in the housing may be reversed.

Example

[0076] Hereinafter, embodiments of the present invention will be further described using examples. The conditions used in the examples are one example for confirmation, and the present invention is not limited to this example, and various conditions can be adopted without departing from the present invention and as long as the object of the present invention is achieved.

[0077] (Manufacture of electromagnetic steel sheet) Molten steel was cast to produce an ingot, hot-rolled, pickled, and cold-rolled. In some cases, one or more steps of intermediate annealing, skin pass rolling, and finish annealing were further performed to produce an electromagnetic steel sheet (non-oriented electromagnetic steel sheet). The chemical composition of each steel type of the obtained electromagnetic steel sheet and the transformation temperature of the steel sheet are shown in Table 1. Among the chemical compositions, the content of impurities not specified in the table was 0.0010% or less for each, and 0.10% or less in total. A r1 (°C) is the temperature at which it transforms into the α phase, A c1 (°C) indicates the temperature at which it transforms into the γ phase. For chemical compositions that do not undergo α-γ transformation (non-transformation type), "-" was described in the column of the phase transformation point temperature. Also, in the formula in the table 1) The column shows the calculation result of Nb / 93 + Zr / 91 + Ti / 48 + V / 51 - (C / 12 + N / 14) using the content in mass% of Nb, Zr, Ti, V, C, and N. In addition, various manufacturing conditions are shown in Tables 2-1 and 2-2. Further, an insulating film made of known Al2O3 was formed on the surface of the electromagnetic steel sheet obtained by the above method. The thickness of the insulating film was set to 0.5 μm. The final thickness in Table 2 is the thickness of the base metal steel sheet after the steps in Table 2 are completed.

[0078]

Table 1

[0079]

Table 2-1

[0080]

Table 2-2

[0081] (Motor manufacturing and evaluation) Next, using the obtained electromagnetic steel sheet, a stator core and a rotor core to be used in the above evaluation motor were manufactured. At that time, as shown in Tables 3-1 to 3-4, some of the cores were subjected to stress relief annealing at 800 °C for 2 hours. Then, these cores were combined to manufacture an evaluation motor, and the motor loss and noise were measured.

[0082] (Evaluation motor) Figure 1 is a partial plan view of the motor. The motor 300 is an IPM motor manufactured based on the Institute of Electrical and Electronics Engineers (IEEE) D model. The outer diameter of the stator core 3 is 112 mm (= 54 mm + 0.5 mm × 2 + 28.5 mm × 2), the outer diameter of the rotor 302 is 54 mm, the stacked height of the stator core 3 is 100 mm, and the number of slots is 24 slots. The stator core 3 is fixed to the housing 301 by shrink fitting. The inner diameter of the stator core 3 is 55 mm φ, and the gap between the rotor 302 and the stator core 3 is 0.5 mm. The stator core has 24 slots, the number of turns per equivalent of the copper wire wound around the teeth portion of the stator core is 35 turns, and the magnetic flux density Br of the rotor magnet is 1.25 T.

[0083] (Motor loss) (Noise) In this embodiment, the loss (motor loss (W)) and noise generated by the motor when a winding current with a wave height value of 3 A was passed at a phase angle of 30 degrees and driven for 60 minutes at a rotational speed of 1500 RPM were obtained. The loss of the motor was obtained by calculating the power (W) required under the above operating conditions and the work amount (W) of the motor, and subtracting the work amount from the power. The power was measured using a power meter. The work amount was obtained by attaching a torque meter to the tip of the motor and calculating the work amount from torque × rotational speed. The noise measurement was performed in an anechoic chamber with a background noise of 16 dBA. The noise meter was installed at a position 0.3 m from the surface of the iron core, and the A characteristic was used for the auditory sensation correction. Regarding the noise, the noise during the operation of the motors in Test Nos. 1, 16, 21, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, and 61 was used as a reference, and the difference from the reference using the same steel type was evaluated. The orientation strength of the iron core material of each iron core is shown in Tables 3-1 to 3-8 together with the motor loss and noise (relative value). The orientation strength shown here is the measured value for the iron core material after stress-relieving annealing when stress-relieving annealing was performed after forming the iron core.

[0084] [Table 3-1]

[0085] [Table 3-2]

[0086] [Table 3-3]

[0087] [Table 3-4]

[0088] [Table 3-5]

[0089]

Table 3-6

[0090]

Table 3-7

[0091]

Table 3-8

[0092] The effects of the present invention are evaluated by the relative values with respect to the motor loss and noise in a motor in which the core material of the stator and the core material of the rotor are made of the same steel plate. In a motor in which the core material of the stator and the core material of the rotor are made of different steel plates, when the motor loss and noise are smaller than those in a motor made of the same steel plate (steel plate having the same steel type and manufacturing conditions), it becomes an invention example.

[0093] In Test Nos. 1, 16, 21, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61 in Tables 3-1 to 3-8, the core materials of the stator and the rotor are made of the same steel type and are examples using steel plates having the same strain-relief annealing conditions. These are set as Comparative Example (Reference A), Comparative Example (Reference B), Comparative Example (Reference D), Comparative Example (Reference F), Comparative Example (Reference G), Comparative Example (Reference H), Comparative Example (Reference I), Comparative Example (Reference J), Comparative Example (Reference K), Comparative Example (Reference L), Comparative Example (Reference M), Comparative Example (Reference N), Comparative Example (Reference O), Comparative Example (Reference P), Comparative Example (Reference Q), Comparative Example (Reference R), Comparative Example (Reference S), Comparative Example (Reference T), and Comparative Example (Reference U), respectively. Test Nos. 1 to 15 are examples of the embodiments using Steel Type A described in Table 1. It can be seen that in Invention Examples Nos. 2 to 7, 10, 11, 15, both the motor loss and the noise are lower than those in the Comparative Example (Reference A) used as a reference. Tests No. 16 to 18 are examples using Component B described in Table 1. Invention Example No. 17 is an example in which the {111}<211> orientation intensity of the stator core material is weakened and the {411}<011> orientation intensity is increased by changing the cold rolling reduction ratio, and Invention Example No. 18 is an example in which the {111}<211> orientation intensity of the stator core material is weakened and the {411}<011> orientation intensity is increased by changing the heating rate. In addition, Test No. 19 is an example in which a steel plate with increased {111}<211> orientation intensity due to Nb content is applied as the rotor core material. It can be seen that in Invention Examples 17 to 19, both the motor loss and noise are lower than those in Test No. 16 (Comparative Example (Reference B)) used as a reference. Tests No. 21 to 25 are examples using Component D described in Table 1. It can be seen that in Invention Examples No. 22 to 25, both the motor loss and noise are lower than those in Test No. 21 (Comparative Example (Reference D)) used as a reference.

[0094] Test No. 26 has a combination of stator (D1) and rotor (E1) as the steel plate materials. A steel plate with increased {111}<211> orientation intensity due to Ti content is applied as the rotor core material, and both the motor loss and noise are lower than those in Test No. 21 (Comparative Example (Reference D)). Invention Examples No. 28, 29, and 30 are combinations of stator (A1) with rotor (D1), rotor (V1), or rotor (W1). In these examples, a transformation system material (low-Si steel) is applied to the rotor core material to increase the {111}<211> orientation intensity, and both the motor loss and noise are lower than those in Test No. 21 (Comparative Example (Reference D)).

[0095] Tests No. 31 to 32 are examples using Steel Grade F described in Table 1. It can be seen that in Invention Example Test No. 32, both the motor loss and noise are lower than those in Test No. 31 (Comparative Example (Reference F)) used as a reference. Tests No. 33 to 34 are examples using Steel Grade G described in Table 1. It can be seen that in Invention Example Test No. 34, both the motor loss and noise are lower than those in No. 33 (Comparative Example (Reference G)) used as a reference.

[0096] Similarly, Test Nos. 36 to 62 are examples using steel grades H to U described in Table 1. It can be seen that in Test Nos. 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, and 62, both the motor loss and the noise are lower than those in Test Nos. 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, and 61, which are the references using the same steel grades.

[0097] On the other hand, in Test Nos. 8, 9, 12, 14, 20, and 27, the predetermined directional intensity could not be obtained, and the motor loss and the noise were inferior to the references.

[0098] The rotating electrical machine according to the present invention applies different steel plates in which the chemical composition, hot rolling conditions, cold rolling conditions, and annealing conditions are appropriately controlled as the core material of the stator and the core material of the rotor, respectively, so that it has excellent characteristics in terms of motor loss and noise.

Industrial Applicability

[0099] According to the present invention, since a rotating electrical machine with excellent motor loss and noise can be provided, it is extremely useful industrially.

Explanation of Reference Numerals

[0100] 3 Stator core 300 Motor 301 Housing 302 Rotor< / uvw> < / uvw> < / uvw>

Claims

1. A stator, a rotor, and a housing that houses the stator and the rotor are provided, wherein A, which is the {111}<211> orientation intensity of the base steel plate of the non-oriented electromagnetic steel sheet included in the stator, is less than 15, B, which is the {111}<211> orientation intensity of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor, is 2 to 30, and B / A > 1.0 is satisfied between A and B, wherein C, which is the {411}<011> orientation intensity of the base steel plate of the non-oriented electromagnetic steel sheet included in the stator, is 2 to 50, D, which is the {411}<011> orientation intensity of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor, is 1 to 40, and C / D > 1.0 is satisfied between C and D, wherein the base steel plates of the non-oriented electromagnetic steel sheets included in the rotor and the stator by mass%, C: 0.0100% or less, Si: 0.5000 to 4.0000%, sol.Al: 0.0001 to 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: a total of 0.1000 to 5.0000%, Cr: 0 to 2.0000%, Sn: 0 to 0.4000%, Sb: 0 to 0.4000%, P: 0 to 0.4000%, Ti: 0 to 0.1000%, Nb: 0 to 0.1000%, Zr: 0 to 0.1000%, V: 0 to 0.1000%, are included, and the balance consists of Fe and impurities, having a chemical composition, characterized in that it is an electric rotating machine.

2. In the non-oriented electromagnetic steel sheet included in the rotor, B / E > 1.0 is satisfied between B and E, which is the {111}<011> orientation intensity. The electric rotating machine according to claim 1, characterized in that.

3. In the non-oriented electromagnetic steel sheet included in the stator, C / F > 1.0 is satisfied between C and F, which is the {100}<011> orientation intensity. The electric rotating machine according to claim 1, characterized in that.

4. The difference in the total of the Si content, Mn content, and sol.Al content in the base steel plates of the non-oriented electromagnetic steel sheet included in the stator and the non-oriented electromagnetic steel sheet included in the rotor is within 0.20 mass%, and the average crystal grain size of the non-oriented electromagnetic steel sheet included in the stator is larger than the average crystal grain size of the non-oriented electromagnetic steel sheet included in the rotor. The rotating electrical machine according to any one of claims 1 to 3, characterized in that...

5. The Si content, Ti content, and Nb content of the base steel plate of the non-oriented electromagnetic steel sheet included in the stator are Si ｓ , Ti ｓ , Nb ｓ by mass%, respectively, and the Si content, Ti content, and Nb content of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor are Si ｒ , Ti ｒ , Nb ｒ by mass%, respectively. When Si ｓ / Si ｒ > 1.0, Ti ｒ / Ti ｓ > 1.0, Nb ｒ / Nb ｓ satisfying any of > 1.0, The rotating electrical machine according to any one of claims 1 to 3, characterized in that...

6. When the Nb content, Zr content, Ti content, V content, C content, and N content of the base steel plate of the non-oriented electromagnetic steel sheet included in the stator are in mass %, Nb ｓ , Zr ｓ , Ti ｓ , V ｓ , C ｓ , N ｓ respectively, 0 ≥ Nb ｓ / 93 + Zr ｓ / 91 + Ti ｓ / 48 + V ｓ / 51 - (C ｓ / 12 + N ｓ / 14) is satisfied, The rotating electrical machine according to any one of claims 1 to 3, characterized in that...

7. When the Nb content, Zr content, Ti content, V content, C content, and N content of the base steel plate of the non-oriented electromagnetic steel sheet included in the rotor are respectively Nb ｒ , Zr ｒ , Ti ｒ , V ｒ , C ｒ , N ｒ in mass%, then 0 < Nb ｒ / 93 + Zr ｒ / 91 + Ti ｒ / 48 + V ｒ / 51 - (C ｒ / 12 + N ｒ / 14) < 5.0 × 10 －３ satisfying The rotating electrical machine according to any one of claims 1 to 3, characterized in that...

8. A base metal steel sheet and an insulating film formed on the surface of the base metal steel sheet, comprising: wherein the base metal steel sheet by mass%, C: 0.0100% or less, Si: 0.5000 - 4.0000%, sol. Al: 0.0001 - 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: in total 0.1000 - 5.0000%, Cr: 0 - 2.0000%, Sn: 0 - 0.4000%, Sb: 0 - 0.4000%, P: 0 - 0.4000%, Ti: 0 - 0.1000%, Nb: 0 - 0.1000%, Zr: 0 - 0.1000%, V: 0 - 0.1000%, having a chemical composition consisting of the balance Fe and impurities, in the base metal steel sheet, the {111}<211> orientation intensity is less than 15, the {411}<011> orientation intensity is 2 - 50, non-oriented electrical steel sheet.

9. A base metal steel sheet and an insulating film formed on the surface of the base metal steel sheet, comprising: wherein the base metal steel sheet by mass%, C: 0.0100% or less, Si: 0.5000 - 4.0000%, sol. Al: 0.0001 - 1.0000%, S: 0.0100% or less, N: 0.0100% or less, one or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: in total 0.1000 - 5.0000%, Cr: 0 - 2.0000%, Sn: 0 - 0.4000%, Sb: 0 - 0.4000%, P: 0 - 0.4000%, Ti: 0 - 0.1000%, Nb: 0 - 0.1000%, Zr: 0 - 0.1000%, V: 0 - 0.1000%, having a chemical composition consisting of the balance Fe and impurities, in the base metal steel sheet, the {111}<211> orientation intensity is 2 - 30, and the {411}<011> orientation intensity is 1 - 40, non-oriented electrical steel sheet.

10. A laminated core formed by laminating the non-oriented electrical steel sheet according to claim 8.

11. A laminated core formed by laminating the non-oriented electrical steel sheet according to claim 9.

12. The non-oriented electromagnetic steel sheet included in the stator is a steel sheet obtained by further performing heat treatment at 600 °C or higher on the non-oriented electromagnetic steel sheet included in the rotor. The rotating electrical machine according to any one of claims 1 to 3, characterized by this.

13. A method for manufacturing a laminated core, comprising a step of processing and laminating the non-oriented electromagnetic steel sheet according to claim 8.

14. A method for manufacturing a laminated core, comprising a step of processing and laminating the non-oriented electromagnetic steel sheet according to claim 9.

15. A method for manufacturing a rotating electrical machine, comprising a step of assembling the laminated core according to claim 10 and the laminated core according to claim 11. ​

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