JP7415137B2 - Laminated core and rotating electrical machinery - Google Patents

Description

The present invention relates to a laminated core and a rotating electric machine.

Conventionally, a laminated core as described in Patent Document 1 has been known. In this laminated core, adjacent electromagnetic steel sheets in the lamination direction are bonded together by an adhesive layer.

JP2011-023523A

However, Patent Document 1 does not discuss electromagnetic steel sheets to be bonded. Therefore, conventional laminated cores have room for improvement in improving their magnetic properties.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to improve the magnetic properties of a laminated core.

The laminated core of the present invention is arranged in at least a part of the area between a plurality of electromagnetic steel plates stacked such that their plate surfaces face each other and the electromagnetic steel plates adjacent to each other in the lamination direction, and and an adhesive portion for bonding the steel plates together, and the electromagnetic steel plate has, in mass %, C: 0.0100% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.0100% or less, N: 0.0100% or less, one or more types selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au. : 2.50% to 5.00% in total, Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%, and One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total, Mn content (mass% ) is [Mn], Ni content (mass%) is [Ni], Co content (mass%) is [Co], Pt content (mass%) is [Pt], Pb content (mass%) is [Pb], Cu content (mass %) as [Cu], Au content (mass %) as [Au], Si content (mass %) as [Si], sol. The Al content (mass%) was determined by [sol. Al], it satisfies the following formula ( 1 ), has a chemical composition with the balance consisting of Fe and impurities, B50 in the rolling direction is B50L, and B50 in the direction where the angle with the rolling direction is 90° is B50C, when the B50 in one direction and the B50 in the other direction of the two directions where the smaller angle with the rolling direction is 45° are B50D1 and B50D2, respectively, the following ( 2 ) and ( 3 ) are satisfied, the X-ray random intensity ratio of {100}<011> is 5 or more and less than 30, the plate thickness is 0.50 mm or less, and the adhesive part is and a plurality of adhesive portions are provided between the electromagnetic steel plates that are adjacent to each other in the lamination direction, and each of the plurality of adhesive portions extends in a first direction when viewed from the lamination direction, The plurality of bonded portions are arranged in a line with intervals in a second direction perpendicular to the first direction, and the angle between the first direction and the rolling direction of the electrical steel sheet is is 0° or more and 30° or less, or 60° or more and 90° or less .
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])-([Si]+[sol.Al])>0%...( 1 )
(B50D1+B50D2)/2>1.7T...( 2 )
(B50D1+B50D2)/2>(B50L+B50C)/2...( 3 )

A rotating electrical machine of the present invention is characterized by having the laminated core described above.

According to the present invention, the magnetic properties of the laminated core can be improved.

FIG. 1 is a diagram showing an example of the configuration of a rotating electric machine. FIG. 3 is a plan view showing an example of the configuration of a stator core. FIG. 3 is a side view showing an example of the configuration of a stator core. FIG. 3 is a diagram showing an example of the relationship between the B50 ratio and the angle from the rolling direction. FIG. 3 is a diagram showing an example of the relationship between the W15/50 ratio and the angle from the rolling direction. FIG. 3 is a diagram showing an example of the relationship between the W15/100 ratio and the angle from the rolling direction. FIG. 3 is a diagram showing an example of the relationship between the rolling direction and the direction with the best magnetic properties. It is a figure explaining an example of the relationship between an electromagnetic steel plate and an adhesion part. It is a figure which shows an example of the caulking position in a stator core. FIG. 3 is a diagram showing an example of the relationship between the iron loss ratio and the angle formed between the first direction and the rolling direction. It is a figure which shows the modification of the structure of an adhesive part.

(Electromagnetic steel sheet used for laminated core)
First, an electromagnetic steel sheet used for a laminated core in an embodiment to be described later will be described.
First, the chemical composition of the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used in the laminated core, and the steel material used in the manufacturing method thereof will be explained. In the following description, "%", which is the unit of content of each element contained in a non-oriented electrical steel sheet or steel material, means "% by mass" unless otherwise specified. Non-oriented electrical steel sheets and steel materials, which are examples of electrical steel sheets used in laminated cores, have a chemical composition in which ferrite-austenite transformation (hereinafter referred to as α-γ transformation) can occur, C: 0.0100% or less, Si :1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.0100% or less, N: 0.0100% or less, one or more types selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au. : 2.50% to 5.00% in total, Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%, and One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: Contains a total of 0.0000% to 0.0100%, with the remainder being Fe and impurities. It has a chemical composition consisting of: Furthermore, Mn, Ni, Co, Pt, Pb, Cu, Au, Si and sol. The content of Al satisfies a predetermined condition described below. Examples of impurities include those contained in raw materials such as ore and scrap, and those contained in manufacturing processes.

<<C: 0.0100% or less>>
C 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%. Therefore, the C content is set to 0.0100% or less. Reducing the C content also contributes to uniform improvement of magnetic properties in all directions within the plate surface. The lower limit of the C content is not particularly limited, but it is preferably 0.0005% or more, taking into account the cost of decarburization during refining.

<<Si: 1.50% to 4.00%>>
Si increases electrical resistance, reduces eddy current loss, reduces iron loss, increases yield ratio, and improves punching workability into an iron core. If the Si content is less than 1.50%, these effects cannot be sufficiently obtained. Therefore, the Si content is set to 1.50% or more. On the other hand, if the Si content exceeds 4.00%, the magnetic flux density decreases, the punching workability decreases due to an excessive increase in hardness, and cold rolling becomes difficult. Therefore, the Si content is set to 4.00% or less.

<<sol. Al: 0.0001%~1.0%>>
sol. Al increases electrical resistance, reduces eddy current loss, and reduces iron loss. sol. Al also contributes to increasing the relative magnitude of the magnetic flux density B50 to the saturation magnetic flux density. Here, the magnetic flux density B50 is the magnetic flux density in a magnetic field of 5000 A/m. sol. If the Al content is less than 0.0001%, these effects cannot be sufficiently obtained. Furthermore, Al also has the effect of promoting desulfurization in steel manufacturing. Therefore, sol. Al content shall be 0.0001% or more. On the other hand, sol. If the Al content exceeds 1.0%, the magnetic flux density decreases, the yield ratio decreases, and the punching workability decreases. Therefore, sol. Al content shall be 1.0% or less.

<<S: 0.0100% or less>>
S is not an essential element and is contained, for example, as an impurity in steel. S inhibits recrystallization and crystal grain growth during annealing due to fine MnS precipitation. Therefore, the lower the S content, the better. The increase in core loss and decrease in magnetic flux density due to such inhibition of recrystallization and grain growth are significant when the S content exceeds 0.0100%. Therefore, the S content is set to 0.0100% or less. Although the lower limit of the S content is not particularly limited, it is preferably 0.0003% or more in consideration of the cost of desulfurization treatment during refining.

<<N: 0.0100% or less>>
Like C, N deteriorates magnetic properties, so the lower the N content, the better. Therefore, the N content is set to 0.0100% or less. Note that the lower limit of the N content is not particularly limited, but it is preferably 0.0010% or more, taking into consideration the cost of denitrification treatment during refining.

<<One or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: 2.50% to 5.00% in total>>
Since these elements are necessary for causing α-γ transformation, it is necessary to contain at least one of these elements in a total amount of 2.50% or more. On the other hand, if the total amount exceeds 5.00%, the cost may increase and the magnetic flux density may decrease. Therefore, the total content of at least one of these elements is 5.00% or less.

In addition, the following conditions are further assumed to be satisfied as conditions under which α-γ transformation can occur. In other words, Mn content (mass%) is [Mn], Ni content (mass%) is [Ni], Co content (mass%) is [Co], Pt content (mass%) is [Pt], Pb content (mass%) is [Pb], Cu content (mass%) is [Cu], Au content (mass%) is [Au], Si content (mass%) is [Si], sol. The Al content (mass%) was determined by [sol. Al], it is preferable that the following formula (1) is satisfied in terms of mass %.
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])-([Si]+[sol.Al])>0%...(1)

If the above-mentioned formula (1) is not satisfied, the α-γ transformation does not occur and the magnetic flux density becomes low.

<<Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%>>
Sn and Sb improve the texture after cold rolling and recrystallization, and improve the magnetic flux density. Therefore, although these elements may be contained as necessary, if they are contained in excess, the steel becomes brittle. Therefore, the Sn content and the Sb content are both 0.400% or less. Further, P may be included in order to ensure the hardness of the steel sheet after recrystallization, but if it is included in excess, it will cause embrittlement of the steel. Therefore, the P content is set to 0.400% or less. When providing additional effects such as magnetic properties as described above, 0.020% to 0.400% Sn, 0.020% to 0.400% Sb, and 0.020% to 0.400% % of P is preferably contained.

<<One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0.0100% in total>>
Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd react with S in the molten steel during casting of the molten steel to produce precipitates of sulfides, oxysulfides, or both of these. Hereinafter, Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd may be collectively referred to as "coarse precipitate-forming elements." The particle size of the precipitates of coarse precipitate-forming elements is about 1 μm to 2 μm, which is much larger than the particle size (about 100 nm) of fine precipitates such as MnS, TiN, AlN, etc. Therefore, these fine precipitates adhere to the precipitates of the coarse precipitate-forming elements, making it difficult to inhibit recrystallization and crystal grain growth during intermediate annealing. In order to fully obtain these effects, it is preferable that the total content of these elements is 0.0005% or more. However, when the total amount of these elements exceeds 0.0100%, the total amount of sulfides, oxysulfides, or both becomes excessive, and recrystallization and crystal grain growth during intermediate annealing are inhibited. Therefore, the total content of coarse precipitate-forming elements is set to 0.0100% or less.

<<Collective organization>>
Next, the texture of a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for the laminated core, will be explained. The details of the manufacturing method will be described later, but the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, has a chemical composition that allows α-γ transformation to occur, so it is necessary to rapidly cool it immediately after finishing hot rolling. By refining the structure, a structure in which {100} crystal grains have grown is obtained. As a result, the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, has an integrated strength of 5 to 30 in the {100}<011> direction, and the magnetic flux density B50 in the 45° direction with respect to the rolling direction is particularly high. It gets expensive. In this way, although the magnetic flux density becomes high in a specific direction, a high magnetic flux density is obtained overall in all directions on average. When the integrated strength of the {100}<011> direction becomes less than 5, the integrated strength of the {111}<112> direction, which lowers the magnetic flux density, becomes high, and the magnetic flux density decreases as a whole. Further, a manufacturing method in which the integrated strength in the {100}<011> orientation exceeds 30 requires thickening of the hot rolled plate as described above, and there is a problem that manufacturing is difficult.

The integrated intensity in the {100}<011> direction can be measured by an X-ray diffraction method or an electron backscatter diffraction (EBSD) method. Since the reflection angle of X-rays and electron beams from the sample differs depending on the crystal orientation, the crystal orientation strength can be determined from the reflection intensity and the like using a randomly oriented sample as a reference. The integrated strength in the {100}<011> direction of a non-oriented electromagnetic steel sheet suitable as an example of an electromagnetic steel sheet used in the laminated core is 5 to 30 in X-ray random intensity ratio. At this time, the crystal orientation may be measured by EBSD and a value converted to an X-ray random intensity ratio may be used.

<<Thickness>>
Next, the thickness of a non-oriented electromagnetic steel sheet, which is an example of an electromagnetic steel sheet used for the laminated core, will be explained. The thickness of a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for the laminated core, is 0.50 mm or less. If the thickness exceeds 0.50 mm, excellent high frequency iron loss cannot be obtained. Therefore, the thickness should be 0.50 mm or less.

<<Magnetic properties>>
Next, the magnetic properties of a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for the laminated core, will be explained. When examining the magnetic properties, the value of B50, which is the magnetic flux density of a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for the laminated core, is measured. In the produced non-oriented electrical steel sheet, one rolling direction cannot be distinguished from the other. Therefore, in this embodiment, the rolling direction refers to both directions. The value of B50 (T) in the rolling direction is B50L, the value of B50 (T) in the direction inclined at 45 degrees from the rolling direction is B50D1, the value of B50 (T) in the direction inclined at 90 degrees from the rolling direction is B50C, the rolling direction When the value of B50(T) in a direction tilted by 135 degrees from 1 is B50D2, there is anisotropy in magnetic flux density such that B50D1 and B50D2 are the highest and B50L+B50C is the lowest. Note that (T) refers to the unit of magnetic flux density (Tesla).

Here, for example, when considering the omnidirectional (0° to 360°) distribution of magnetic flux density with the clockwise (or counterclockwise) direction as the positive direction, the rolling direction is 0° (unidirectional) and 180°. degree (other direction), B50D1 has B50 values of 45° and 225°, and B50D2 has B50 values of 135° and 315°. Similarly, B50L has B50 values of 0° and 180°, and B50C has B50 values of 90° and 270°. The B50 value at 45° and the B50 value at 225° exactly match, and the B50 value at 135° and the B50 value at 315° match exactly. However, B50D1 and B50D2 may not match exactly because it may not be easy to make them have the same magnetic properties during actual manufacturing. Similarly, the B50 value at 0° and the B50 value at 180° are exactly the same, the B50 value at 90° and the B50 value at 270° are exactly the same, and the B50L and B50C are exactly the same. It may not. A non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, satisfies the following equations (2) and (3) using the average value of B50D1 and B50D2 and the average value of B50L and B50C. .
(B50D1+B50D2)/2>1.7T...(2)
(B50D1+B50D2)/2>(B50L+B50C)/2...(3)

In this way, when measuring the magnetic flux density, the average value of B50D1 and B50D2 is 1.7T or more as shown in equation (2), and high anisotropy of magnetic flux density is confirmed as shown in equation (3). .

Furthermore, in addition to satisfying formula (1), it is preferable that the anisotropy of the magnetic flux density is higher than formula (3), as in formula (4) below.
(B50D1+B50D2)/2>1.1×(B50L+B50C)/2...(4)
Furthermore, it is preferable that the anisotropy of the magnetic flux density is higher, as shown in the following equation (5).
(B50D1+B50D2)/2>1.2×(B50L+B50C)/2...(5)

Note that the above-mentioned 45° is a theoretical value, and it may not be easy to match it to 45° in actual manufacturing, so it includes cases that do not strictly match 45°. This also applies to the angles of 0°, 90°, 135°, 180°, 225°, 270°, and 315°.

The magnetic flux density can be measured by cutting out a 55 mm square sample from a direction of 45°, 0°, etc. with respect to the rolling direction, and using a single plate magnetic measuring device.

<<Manufacturing method>>
Next, an example of a method for manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, will be described. When manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, for example, hot rolling, cold rolling (first cold rolling), intermediate annealing (first annealing), Skin pass rolling (second cold rolling), finish annealing (third annealing), strain relief annealing (second annealing), etc. are performed.

First, the steel material described above is heated and hot rolled. The steel material is, for example, a slab manufactured by normal continuous casting. Rough rolling and finish rolling of hot rolling are performed at a temperature in the γ range (Ar1 or higher). That is, hot rolling is performed so that the finishing temperature of finish rolling becomes Ar1 or higher. As a result, the structure becomes finer by transforming from austenite to ferrite through subsequent cooling. If cold rolling is then performed in the refined state, overhang recrystallization (hereinafter referred to as bulging) is likely to occur, and {100} crystal grains, which are normally difficult to grow, can be made to grow easily.

Further, when manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, the temperature (finishing temperature) when passing through the final pass of finish rolling is set to Ar1 or higher. The crystal structure is refined by transforming from austenite to ferrite. By refining the crystal structure in this manner, bulging can be easily generated through subsequent cold rolling and intermediate annealing.

Thereafter, the hot-rolled steel plate is wound up without being annealed, pickled, and then cold-rolled to the hot-rolled steel plate. In cold rolling, the reduction ratio is preferably 80% to 92%. When the rolling reduction is less than 80%, bulging is less likely to occur, and when the rolling reduction is over 92%, {100} grains tend to grow due to subsequent bulging. It becomes difficult to wind up the rolling material, and the operation becomes difficult.

After the cold rolling is completed, intermediate annealing is subsequently performed. When manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, intermediate annealing is performed at a temperature that does not transform into austenite. That is, it is preferable that the temperature of intermediate annealing be less than Ac1. By performing intermediate annealing in this manner, bulging occurs and {100} crystal grains tend to grow. Further, the time for intermediate annealing is preferably 5 seconds to 60 seconds.

After the intermediate annealing is completed, skin pass rolling is performed next. As described above, when skin pass rolling and annealing are performed in a state where bulging has occurred, {100} crystal grains further grow starting from the portion where bulging has occurred. This is due to skin pass rolling, where {100}<011> crystal grains are less likely to accumulate strain, while {111}<112> crystal grains are prone to strain, and subsequent annealing results in less strain. This is because the {111}<112> crystal grains are eaten away by the difference in strain used by the 011> crystal grains as a driving force. This grain erosion phenomenon, which occurs using the strain difference as a driving force, is called strain-induced grain boundary migration (hereinafter referred to as SIBM). The rolling reduction ratio of skin pass rolling is preferably 5% to 25%. If the rolling reduction is less than 5%, the amount of strain is too small, so strain-induced grain boundary migration (hereinafter referred to as SIBM) does not occur in subsequent annealing, and {100}<011> crystal grains do not become large. On the other hand, when the rolling reduction rate exceeds 25%, the amount of strain becomes too large, and recrystallization nucleation (hereinafter referred to as nucleation) in which new crystal grains are generated from among the {111}<112> crystal grains occurs. In this nucleation, most of the grains produced are {111}<112> crystal grains, resulting in poor magnetic properties.

After skin pass rolling, finish annealing is performed to release strain and improve workability. Similarly, the final annealing temperature is set to a temperature that does not transform to austenite, and the final annealing temperature is lower than Ac1. By performing final annealing in this manner, the {100}<011> crystal grains attack the {111}<112> crystal grains, thereby improving the magnetic properties. Furthermore, the time required for the temperature to reach Ac1 from 600°C during final annealing is set to within 1200 seconds. If this annealing time is too short, most of the strain introduced by the skin pass will remain, causing warping when punching out a complex shape. On the other hand, if the annealing time is too long, the crystal grains will become too coarse, leading to large sagging during punching and resulting in poor punching accuracy.

When the final annealing is completed, the non-oriented electrical steel sheet is subjected to forming processing and the like in order to obtain the desired steel member. Then, the steel member made of a non-oriented electromagnetic steel sheet is subjected to strain relief annealing in order to remove distortion caused by forming or the like (for example, punching). In this embodiment, the temperature of strain relief annealing is set to about 800°C, and the time of strain relief annealing is set to about 2 hours, in order to generate SIBM and make the crystal grain size coarser below Ac1. do.

Non-oriented electrical steel sheets (steel members), which are an example of electrical steel sheets used for laminated cores, are manufactured using the above-mentioned method ( 2 ), mainly by finishing rolling at Ar1 or higher in the hot rolling process. A high B50 of the formula and excellent anisotropy of the formula ( 3 ) can be obtained. Furthermore, in the cold rolling process, by setting the rolling reduction to about 85%, the above equation ( 4 ) can be obtained, and by setting the rolling reduction to about 10% in the skin pass rolling process, the above-mentioned equation ( 5 ) can be improved. is obtained.

As described above, a steel member made of a non-oriented electromagnetic steel sheet can be manufactured as an example of an electromagnetic steel sheet used for a laminated core.

Next, a non-oriented electromagnetic steel sheet, which is an example of an electromagnetic steel sheet used for the laminated core, will be specifically described with reference to examples. The examples shown below are merely examples of non-oriented electrical steel sheets, and the non-oriented electrical steel sheets are not limited to the following examples.

<<First example>>
Ingots having the components shown in Table 1 below were produced by casting molten steel. Here, the left side of the equation represents the value on the left side of the above-mentioned equation (1). Thereafter, the produced ingot was heated to 1150° C. and hot rolled to a thickness of 2.5 mm. After completion of finish rolling, the hot rolled steel plate was cooled with water and wound up. The temperature at the stage of the final pass of finish rolling (finishing temperature) at this time was 830°C, which was all higher than Ar1. Incidentally, No. 3, in which γ-α transformation does not occur. Regarding No. 108, the finishing temperature was 850°C.

Next, scale was removed from the hot rolled steel plate by pickling, and cold rolling was performed until the plate thickness became 1.1 times the target thickness (0.055 to 0.550 mm). Then, intermediate annealing was performed at 700° C. for 30 seconds in a non-oxidizing atmosphere. Next, a second cold rolling (skin pass rolling) was performed until the target thickness (0.05 to 0.50 mm) was achieved. However, in order to control the {100}<011> intensity, No. For Nos. 110 to 112, the rolling reduction ratio in cold rolling was varied from 80% to 92%, and the rolling reduction ratio in the second cold rolling (skin pass rolling) was varied in the range from 5 to 25%. Also, No. In No. 113, the thickness of the hot rolled plate was 7 mm, the cold rolling reduction was 95%, and no skin pass rolling was performed.

Next, in order to investigate the magnetic properties, after the second cold rolling (skin pass rolling), final annealing was performed at 800°C for 30 seconds, and a 55 mm square sample was prepared by shear processing, and then it was heated at 800°C for 2 hours. Strain relief annealing was performed and the magnetic flux density B50 was measured. The measurement samples were 55 mm square samples taken in two directions: 0° and 45° in the rolling direction. Then, these two types of samples were measured, and the magnetic flux densities B50 at 0°, 45°, 90°, and 135° with respect to the rolling direction were defined as B50L, B50D1, B50C, and B50D2, respectively.

The underlines in Table 1 indicate conditions outside the scope of the present invention. Invention example No. 101~No. 107, No. 109~No. 111, No. 114~No. No. 116 had good magnetic flux density B50 values both in the 45° direction and on the average around the entire circumference. On the other hand, the comparative example No. In No. 108, the Si concentration was high, the value on the left side of the equation was 0 or less, and the composition did not undergo α-γ transformation, so the magnetic density B50 was low in all cases. Comparative example No. In No. 112, the skin pass rolling rate was lowered, so the {100}<011> strength was less than 5, and the magnetic flux density B50 was low. Comparative example No. 113 has a {100}<011> intensity of 30 or more and is outside the scope of the present invention. No. 113 had the disadvantage of being difficult to operate because the hot-rolled plate was 7 mm thick.

<<Second example>>
Ingots having the components shown in Table 2 below were produced by casting molten steel. Thereafter, the produced ingot was heated to 1150° C. and hot rolled to a thickness of 2.5 mm. After completion of finish rolling, the hot rolled steel plate was cooled with water and wound up. The finishing temperature at the stage of the final pass of finish rolling at this time was 830°C, which was all higher than Ar1.

Next, scale was removed from the hot rolled steel plate by pickling, and cold rolling was performed until the plate thickness became 0.385 mm. Then, intermediate annealing was performed in a non-oxidizing atmosphere, and the temperature of the intermediate annealing was controlled so that the recrystallization rate was 85%. Next, a second cold rolling (skin pass rolling) was performed until the plate thickness became 0.35 mm.

Next, in order to investigate the magnetic properties, after the second cold rolling (skin pass rolling), final annealing was performed at 800°C for 30 seconds, and a 55 mm square sample was prepared by shear processing, and then it was heated at 800°C for 2 hours. Strain relief annealing was performed, and magnetic flux density B50 and iron loss W10/400 were measured. The magnetic flux density B50 was measured using the same procedure as in the first example. On the other hand, iron loss W10/400 was measured as the energy loss (W/kg) generated in the sample when a 400 Hz alternating magnetic field was applied so that the maximum magnetic flux density was 1.0 T. The iron loss was the average value of the results measured at 0°, 45°, 90°, and 135° with respect to the rolling direction.

No. 201~No. No. 214 were all invention examples, and all had good magnetic properties. In particular, No. 202~No. 204 is No. 201, No. 205~No. The magnetic flux density B50 is higher than that of No. 214. 205~No. 214 is No. 201~No. Iron loss W10/400 was lower than 204.

(Laminated core)
The present inventors have studied constructing a laminated core using an adhesive in order to effectively utilize the characteristics of such non-oriented electrical steel sheets, and have discovered the embodiments described below.
Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the electromagnetic steel sheet is the non-oriented electromagnetic steel sheet described in the section (Electromagnetic steel sheet used for laminated core). In addition, in the following explanation, in the explanation of (electromagnetic steel sheet used for laminated core), a direction inclined at 45 degrees from the rolling direction and a direction inclined at 135 degrees from the rolling direction will be referred to as angles made with the rolling direction as necessary. These two directions are collectively referred to as two directions in which the smaller angle is 45°. Note that the 45° is expressed assuming that both clockwise and counterclockwise angles have positive values. If the clockwise direction is a negative direction and the counterclockwise direction is a positive direction, the two directions in which the smaller angle with the rolling direction is 45° are the angles made with the rolling direction. There are two directions in which the angle with the smaller absolute value is 45° and -45°. In addition, a direction tilted by θ° from the rolling direction is referred to as a direction having an angle of θ° with the rolling direction, if necessary. In this way, a direction tilted by θ° from the rolling direction and a direction that makes an angle of θ° with the rolling direction have the same meaning. In addition, in the following description, in addition to cases in which the length, direction, position, etc. are exactly the same, cases in which they are the same within a range that does not deviate from the gist of the invention (for example, within the range of errors that occur in the manufacturing process) are also included. .
In this embodiment, an electric motor, specifically an AC motor, more specifically a synchronous motor, and even more specifically a permanent magnet field type electric motor will be described as an example of the rotating electric machine. This type of electric motor is suitably employed in, for example, electric vehicles.

FIG. 1 is a diagram showing an example of the configuration of a rotating electrical machine. FIG. 1 is a diagram (plan view) of a rotating electrical machine viewed from a direction parallel to the axis of the rotating electrical machine. FIG. 2 is a diagram showing an example of the configuration of the stator core. FIG. 2 is a diagram (plan view) of the stator core viewed from a direction parallel to the axis of the stator core. In each figure, the XYZ coordinates indicate the directional relationship in each figure. A symbol with a ● inside a circle indicates the direction from the back side of the paper to the front side. A symbol with an x inside a circle indicates the direction from the front side to the back side of the page.
As shown in FIGS. 1 and 2, the rotating electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotating shaft (rotating shaft) 60. Stator 20 and rotor 30 are housed in case 50. Stator 20 is fixed to case 50.

In the rotating electric machine 10 of this embodiment, for example, an excitation current with an effective value of 10 A and a frequency of 100 Hz is applied to each phase of the stator 20, and accordingly, the rotor 30 and the rotating shaft 60 rotate at a rotation speed of 1000 rpm. .

In this embodiment, the rotating electric machine 10 is an inner rotor type in which the rotor 30 is located inside the stator 20. However, as the rotating electric machine 10, an outer rotor type in which the rotor 30 is located outside the stator 20 may be adopted. Further, in this embodiment, the rotating electric machine 10 is a three-phase AC motor with 12 poles and 18 slots. However, for example, the number of poles, the number of slots, the number of phases, etc. can be changed as appropriate.

The stator 20 includes a stator core (laminated core) 21 and windings (not shown). Stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23 . In the following description, the axial direction of the stator core 21 (core back portion 22) (the direction along the central axis O of the stator core 21) will be referred to as the axial direction as necessary. Further, the radial direction (direction perpendicular to the central axis O of the stator core 21) of the stator core 21 (core back portion 22) is referred to as the radial direction as necessary. Further, the circumferential direction of the stator core 21 (core back portion 22) (the direction in which it revolves around the central axis O of the stator core 21) is referred to as the circumferential direction as necessary.

The core back portion 22 is formed in an annular shape in a plan view of the stator 20 in the axial direction. The plurality of teeth portions 23 protrude radially inward from the core back portion 22 (toward the central axis O of the core back portion 22 along the radial direction). The plurality of teeth portions 23 are arranged at equal intervals in the circumferential direction. In this embodiment, 18 teeth portions 23 are provided so that each tooth portion 23 has a central angle of 20° with respect to the central axis O. The plurality of teeth portions 23 have the same shape and size. The windings of the stator 20 are wound around the teeth portions 23. The windings of the stator 20 may be concentratedly wound or distributedly wound.

The rotor 30 is arranged radially inside the stator 20 (stator core 21). The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32. Rotor core 31 is arranged coaxially with stator 20. The shape of the rotor core 31 is generally annular (circular). A rotating shaft 60 is arranged within the rotor core 31 . The rotating shaft 60 is fixed to the rotor core 31. The plurality of permanent magnets 32 are fixed to the rotor core 31. In this embodiment, one magnetic pole is formed by a set of two permanent magnets 32. The plurality of sets of permanent magnets 32 are arranged at equal intervals in the circumferential direction. In this embodiment, 12 sets (24 in total) of permanent magnets 32 are provided so that the central angle of each set of permanent magnets 32 with respect to the central axis O is 30°.

In this embodiment, an embedded magnet type motor is employed as the permanent magnet field type motor. A plurality of through holes 33 are formed in the rotor core 31 so as to penetrate the rotor core 31 in the axial direction. The plurality of through holes 33 are provided corresponding to the plurality of permanent magnets 32. Each permanent magnet 32 is fixed to the rotor core 31 while being disposed within the corresponding through hole 33 . Fixing of each permanent magnet 32 to the rotor core 31 is achieved, for example, by bonding the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive. Note that a surface magnet type motor may be employed as the permanent magnet field type motor in place of the embedded magnet type motor.

FIG. 3 is a diagram showing an example of the configuration of the stator core 21. As shown in FIG. FIG. 3 is a diagram (side view) of the stator core 21 viewed from the side of the stator core 21. As shown in FIG. 3, stator core 21 is a laminated core. The stator core 21 is formed by laminating a plurality of electromagnetic steel plates 40 such that their outer edges meet and their plate surfaces (surfaces facing the direction in which the electromagnetic steel plates 40 are stacked) face each other. That is, the stator core 21 includes a plurality of electromagnetic steel plates 40 stacked in the thickness direction. In the following description, the direction in which the plurality of electromagnetic steel sheets 40 are stacked will be referred to as the stacking direction, if necessary. The stacking direction coincides with the thickness direction of the electromagnetic steel sheet 40. Further, the stacking direction coincides with the direction in which the central axis O extends (the axial direction (height direction) of the stator core 21).

Note that the stacked thickness of the stator core 21 is, for example, 50.0 mm. The outer diameter of the stator core 21 is, for example, 250.0 mm. The inner diameter of the stator core 21 is, for example, 165.0 mm. However, these values are just examples, and the stacking thickness, outer diameter, and inner diameter of the stator core 21 are not limited to these values. Here, the inner diameter of the stator core 21 is based on the tips of the teeth portions 23 in the stator core 21. The inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the tips of all the teeth portions 23.

Each electromagnetic steel plate 40 forming the stator core 21 is formed, for example, by punching a rolled plate-shaped base material (hoop). The electromagnetic steel sheet 40 is the electromagnetic steel sheet described in the section (Electromagnetic steel sheet used for laminated core). The ratio of B50, W15/50, and W15/100 of the electrical steel sheet explained in the section (Electromagnetic steel sheet used for laminated core) to the known non-oriented electrical steel sheet (B50 ratio, W15/50 ratio, W15/100 ratio ) are shown in Table 4. The thickness of both electromagnetic steel sheets is 0.25 mm. A non-oriented electrical steel sheet with a W10/400 of 12.8 W/kg was used as a known non-oriented electrical steel sheet. W10/400 is the iron loss when the magnetic flux density is 1.0 T and the frequency is 400 Hz. Further, the known non-oriented electrical steel sheet has the best magnetic properties in the rolling direction. In the following description, the electromagnetic steel sheet described in the section (Electromagnetic steel sheet used for laminated core) will also be referred to as a developed material, if necessary. Further, the known non-oriented electrical steel sheet is also referred to as a conventional material, if necessary.

Here, B50 is the magnetic flux density when the magnetic field strength is 5000 A/m, and W15/100 is the iron loss when the magnetic flux density is 1.5 T and the frequency is 100 Hz. Here, magnetic flux density and iron loss were measured using the method described in JIS C 2556:2015. Furthermore, in Table 4, the average value for each angle from the rolling direction of the developed material is normalized by setting the average value for each angle from the rolling direction of the conventional material as 1.000 (= the value of the average value for each angle from the rolling direction of the developed material). The average value for each angle ÷ the average value for each angle from the rolling direction of the conventional material). Thus, the values in Table 4 are relative values (dimensionless quantities).

From Table 4, the B50 of the developed material is 5.1% larger than the B50 of the conventional material. W15/50 of the developed material is 12.0% smaller than W15/50 of the conventional material. W15/100 of the developed material is 13.5% smaller than W15/100 of the conventional material. In this way, the developed material has a larger B50 and lower iron loss than the conventional material.

FIG. 4 is a diagram showing an example of the relationship between the B50 ratio and the angle from the rolling direction. FIG. 5 is a diagram showing an example of the relationship between the W15/50 ratio and the angle from the rolling direction. FIG. 6 is a diagram showing an example of the relationship between the W15/100 ratio and the angle from the rolling direction.
FIG. 7 is a diagram showing an example of the relationship between the rolling direction RD and the direction with the best magnetic properties. In the following description, the direction with the best magnetic properties will be referred to as the easy magnetization direction, if necessary. In FIG. 7, if both the clockwise and counterclockwise angles are positive angles and the rolling direction RD angle is 0°, the easy magnetization directions are ED1 and ED2. The magnetic properties of the four regions from the rolling direction RD to the direction where the smaller angle with the rolling direction RD is 90° (the direction indicated by the broken line in FIG. 7) theoretically have a symmetrical relationship. have

In addition, the B50 ratio, W15/50 ratio, and W15/100 ratio shown in Figures 4, 5, and 6 are values normalized by the average value for each angle from the rolling direction of the conventional material, as in Table 4. be. That is, the values of the B50 ratio, W15/50 ratio, and W15/100 ratio shown in FIGS. 4, 5, and 6 are relative values (dimensionless quantities).
As shown in FIG. 4, in the developed material, the B50 ratio is highest when the angle with the rolling direction is 45°, and the B50 ratio becomes smaller as the angle with the rolling direction approaches 0° and 90°.
On the other hand, in the conventional material, the B50 ratio becomes small when the angle with the rolling direction is around 45° to 60°.

As shown in Figures 5 and 6, the developed material has the smallest W15/50 ratio and W15/100 ratio when the angle with the rolling direction is 45°, and when the angle with the rolling direction is 0° and 90°. The W15/50 ratio and W15/100 ratio become larger as the distance approaches .
On the other hand, in the conventional material, the W15/50 ratio and the W15/100 ratio are the smallest when the angle with the rolling direction is 0°, and become large when the angle with the rolling direction is around 45° to 60°.
As described above, the developed material has the best magnetic properties in directions that make an angle of 45° with the rolling direction (easy magnetization directions ED1, ED2). On the other hand, the magnetic properties are the worst in directions where the angle with the rolling direction is 0° and 90° (rolling direction RD and direction perpendicular to rolling direction RD).

In this embodiment, the rolling directions of the plurality of electromagnetic steel sheets 40 forming the stator core 21 coincide with each other. As described above, the magnetic properties are the best in the two easy magnetization directions ED1 and ED2 where the angle with the electromagnetic steel sheet 40 is 45 degrees.

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

In order to ensure insulation performance between the electromagnetic steel sheets 40 stacked on each other, the thickness of the insulating coating (thickness per one side of the electromagnetic steel sheets 40) is preferably 0.1 μm or more. On the other hand, as the insulation coating becomes thicker, the insulation effect becomes saturated. Further, as the insulation coating becomes thicker, the proportion of the insulation coating in the stator core 21 increases, and the magnetic properties of the stator core 21 deteriorate. Therefore, it is better for the insulating film to be as thin as possible as long as the insulation performance can be ensured. The thickness of the insulating coating (thickness per side of the electromagnetic steel sheet 40) is preferably 0.1 μm or more and 5 μm or less, more preferably 0.1 μm or more and 2 μm or less.

As the electromagnetic steel sheet 40 becomes thinner, the iron loss improvement effect gradually becomes saturated. Moreover, as the electromagnetic steel sheet 40 becomes thinner, the manufacturing cost of the electromagnetic steel sheet 40 increases. Therefore, in consideration of the iron loss improvement effect and manufacturing cost, the thickness of the electrical steel sheet 40 is preferably 0.10 mm or more. On the other hand, if the electromagnetic steel sheet 40 is too thick, press punching of the electromagnetic steel sheet 40 becomes difficult. Therefore, in consideration of the press punching operation of the electromagnetic steel sheet 40, the thickness of the electromagnetic steel sheet 40 is preferably 0.65 mm or less. Further, as the electromagnetic steel sheet 40 becomes thicker, iron loss increases. Therefore, in consideration of the core loss characteristics of the electromagnetic steel sheet 40, the thickness of the electromagnetic steel sheet 40 is preferably 0.35 mm or less, more preferably 0.20 mm or 0.25 mm. Considering the above points, the thickness of each electromagnetic steel plate 40 is, for example, 0.10 mm or more and 0.65 mm or less, preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm. be. Note that the thickness of the electromagnetic steel sheet 40 also includes the thickness of the insulation coating. As mentioned above, the thickness of the electromagnetic steel sheet without an insulating coating is 0.50 mm or less. However, since the insulating coating is thin, the thickness of the electromagnetic steel sheet including the insulating coating may be 0.50 mm or less.

The plurality of electromagnetic steel plates 40 forming the stator core 21 are bonded together by an adhesive portion. The adhesive portion is a series of adhesives that are provided between adjacent electromagnetic steel plates 40 in the lamination direction and hardened without being separated. As the adhesive, for example, a thermosetting adhesive based on polymeric bonding is used. As the adhesive composition, (1) an acrylic resin, (2) an epoxy resin, and (3) a composition containing an acrylic resin and an epoxy resin can be used. The tensile modulus of the adhesive is within the range of 2500 MPa to 5000 MPa. If the tensile modulus of the adhesive is less than 2500 MPa, the rigidity of the laminated core may decrease. Therefore, the lower limit of the tensile modulus of the adhesive is 2500 MPa, more preferably 3000 MPa. On the other hand, if the tensile modulus of the adhesive exceeds 5000 MPa, the stress strain applied to the electromagnetic steel sheet 40 will increase, and there is a possibility that the magnetism of the laminated core will deteriorate. Therefore, the upper limit of the tensile modulus of the adhesive is 5000 MPa, more preferably 4000 MPa. Note that the tensile modulus is measured by a resonance method. Specifically, the tensile modulus is measured in accordance with JIS R 1602:1995. As the bonding method, for example, a method may be adopted in which an adhesive is applied to the electromagnetic steel sheet 40 and then bonded by heating and/or pressure bonding. Note that the heating means may be any means, such as heating in a high-temperature bath or electric furnace, or direct energization.

In order to stably obtain sufficient adhesive strength, the thickness of the adhesive portion is preferably 1 μm or more. On the other hand, when the thickness of the bonded portion exceeds 100 μm, the adhesive force is saturated. Further, as the adhesive portion 41 becomes thicker, its proportion decreases, and the magnetic properties such as iron loss of the laminated core decrease. Therefore, the thickness of the adhesive part is preferably 1 μm or more and 100 μm or less, more preferably 1 μm or more and 10 μm or less.

As mentioned above, by using the electromagnetic steel sheet 40 (developed material), B50 can be increased and iron loss can be reduced compared to conventional materials. Therefore, by bonding the developed material using the adhesive portion, the magnetic properties of the stay core 21 can be improved compared to the case of using the conventional material. The adhesive portion may be formed on the entire surface of the electromagnetic steel sheet 40, or the adhesive portion may be formed on a part of the surface of the electromagnetic steel sheet 40. However, it is preferable to arrange the adhesive part as follows. An example of the arrangement of adhesive parts that can further improve the magnetic properties of the stator core 21 will be described with reference to FIG. 8.

FIG. 8 is a diagram illustrating an example of the relationship between the electromagnetic steel sheet 40 and the adhesive portion 41.
When viewed from the stacking direction, the plurality of adhesive parts 41 are formed in a striped shape as a whole. The electromagnetic steel sheets 40 adjacent to each other in the stacking direction are not bonded to each other over the entire surface of the electromagnetic steel sheets 40. All of these electromagnetic steel plates 40 are locally bonded to each other. Note that the plate surface refers to the surface facing the stacking direction.

The plurality of adhesive parts 41 are each formed in a band shape along the first direction D1 when viewed from the stacking direction. The adhesive parts 41 are arranged at equal intervals along the second direction D2. In other words, the plate surface of the electromagnetic steel sheet 40 has an adhesive area 42 where the adhesive part 41 is provided and a non-adhesive area 43 (blank area) where the adhesive part 41 is not provided. Note that the adhesive region 42 of the electromagnetic steel sheet 40 provided with the adhesive portion 41 refers to an area of the plate surface of the electromagnetic steel sheet 40 in which a series of adhesives that are hardened without being separated are provided. In this way, the adhesive portion 41 includes an adhesive. In addition, the non-adhesive area 43 of the electromagnetic steel sheet 40 where the adhesive part 41 is not provided means an area on the plate surface of the electromagnetic steel sheet 40 where a series of adhesives that have hardened without being separated are not provided. .

The adhesive portions 41 are formed in a band shape extending along the first direction D1, and are arranged at equal intervals along the second direction D2. Therefore, the adhesive area 42 and the non-adhesive area 43 on the plate surface of the electromagnetic steel sheet 40 are each formed in a band shape extending along the first direction D1, and the adhesive area 42 and the non-adhesive area 43 are formed in the second direction D2. They are formed in alternating rows along the line. Note that the first direction D1 is a direction in which the strip-shaped adhesive portion 41 extends, and corresponds to the longitudinal direction of the adhesive portion 41. Further, the second direction D2 corresponds to the lateral direction of the adhesive portion 41 formed in a band shape. Further, the first direction D1 and the second direction D2 are orthogonal to each other. In this embodiment, it is assumed that the width of the bonded portions 41 and the gap between the bonded portions 41 are uniform. Here, the width dimension of the adhesive part 41 is the length (representative value) of the adhesive part 41 in the second direction D2, and the gap dimension between adjacent adhesive parts 41 is the length in the second direction D2. This is (a representative value of) the distance (in the second direction D2) between two adhesive parts 41 located at adjacent positions with a distance between them.

FIG. 8 shows the rolling direction RD of the electromagnetic steel sheet 40. Furthermore, the smaller angle between the first direction D1 and the rolling direction RD of the electromagnetic steel sheet 40 is defined as an angle α. Generally, two angles, large and small, are defined as angles formed with two directions, and angle α is the smaller of the two angles formed between the first direction D1 and the rolling direction RD. be. Further, it is assumed that the angle α has a positive value regardless of whether the angle is clockwise or counterclockwise. Therefore, the smaller angle α between the first direction D1 and the rolling direction RD is an angle of 0° or more and 90° or less.

In this embodiment, the adhesive shrinks upon curing. Therefore, as the adhesive hardens, compressive stress is applied to the electromagnetic steel sheet 40, resulting in distortion in the electromagnetic steel sheet 40. When strain occurs in the electromagnetic steel sheet 40, the value of iron loss increases, and there is a possibility that the magnetic properties of the stator core 21 may deteriorate. In the following description, an increase in the value of iron loss will be referred to as "deterioration of iron loss" as necessary.

When the bonded portion 41 is formed into a band shape, the compressive stress applied to the electromagnetic steel sheet 40 is greatest in the direction in which the bonded portion 41 extends (first direction D1). The electrical steel sheet 40 (developed material) has the highest rigidity in the rolling direction RD and the highest rigidity in the direction perpendicular to the rolling direction RD, and has the highest rigidity against compressive stress in the rolling direction RD and the direction perpendicular to the rolling direction RD. Distortion is less likely to occur. Therefore, by bringing the smaller angle α between the first direction D1 and the rolling direction RD closer to 0° or 90°, distortion of the electromagnetic steel sheet 40 can be suppressed.

As described above, the iron loss of the electromagnetic steel sheet 40 is (theoretically) the smallest in the easy magnetization directions ED1 and ED2. Further, when distortion occurs in the easy magnetization directions ED1 and ED2, the deterioration of iron loss becomes most remarkable. Therefore, when the first direction D1 and the easy magnetization directions ED1 and ED2 of the electromagnetic steel sheet 40 match (angle α=45°), the magnetic properties of the stator core 21 are degraded the most. Therefore, by setting the smaller angle α between the first direction D1 and the rolling direction RD away from 45°, it is possible to suppress the deterioration of the iron loss of the electromagnetic steel sheet 40.

In the following description, the direction in which the iron loss is greatest will be referred to as a singular direction SD, if necessary. Theoretically, the singular direction SD is the rolling direction RD and a direction perpendicular to the rolling direction RD. However, in actual manufacturing, it may not be easy to make the specific direction SD coincide with the rolling direction RD and the direction orthogonal to the rolling direction RD. Therefore, theoretically, if the specific direction SD is the rolling direction RD and a direction orthogonal to the rolling direction RD, then in the actual electrical steel sheet 40, the specific direction SD is the rolling direction RD and the direction orthogonal to the rolling direction RD. This also includes those that do not match in the direction perpendicular to the . Since the electromagnetic steel sheet 40 inherently has a large core loss in the specific direction SD, even if strain occurs along the specific direction SD, the deterioration of the core loss is relatively small. Therefore, by setting the direction close to the singular direction SD as the direction in which strain occurs, it is possible to suppress the deterioration of the core loss of the electromagnetic steel sheet 40 as a whole.

As described above, in order to suppress the deterioration of iron loss of the electrical steel sheet 40 due to the compressive stress of the adhesive, the first direction D1 is brought closer to the rolling direction RD or a direction perpendicular to the rolling direction RD. At the same time, it is preferable to move the first direction D1 away from the easy magnetization directions ED1 and ED2. That is, it is preferable that the smaller angle α between the first direction D1 and the rolling direction RD be closer to 0° or 90° and further away from 45°.

From this point of view, in this embodiment, the smaller angle α between the first direction D1 and the rolling direction RD is 0° or more and 30° or less, or 60° or more and 90° or less. It is preferable. By doing so, it is possible to suppress the influence of the compressive stress of the adhesive on the core loss of the electromagnetic steel sheet 40, and to suppress the distortion of the electromagnetic steel sheet 40. As a result, sufficient magnetic properties of the stator core 21 can be ensured.

As shown in FIG. 8, each of the plurality of adhesive parts 41 is formed in a band shape having a width dimension d1 along the second direction D2 on the plate surface of the electromagnetic steel sheet 40. Further, two bonded parts 41 located at adjacent positions with a space between them in the second direction D2 are provided with a gap equal to the distance dimension d2 in the second direction D2. The interval dimension d2 is the width dimension of the non-adhesion region 43. Here, the width dimension d1 of the adhesive part 41 corresponds to the width dimension of the adhesive area 42, and the interval dimension d2 between the adhesive parts 41 corresponds to the width dimension of the non-adhesive area 43.

The width dimension d1 of the adhesive portion 41 is preferably 5% or less of the outer diameter of the stator core 21. By setting the width dimension d1 to 5% or less of the outer diameter of the stator core 21, the compressive stress of the adhesive does not cause large local distortion in the electrical steel sheet 40, and the core loss of the electrical steel sheet 40 as a whole is reduced. can be suppressed.

It is preferable that the width dimension d1 of the adhesive part 41 is 233% or less of the distance dimension d2 between adjacent adhesive parts 41. This is because if the width dimension d1 of the adhesive part 41 is made too large with respect to the interval dimension d2 between adjacent adhesive parts 41, there is a possibility that the distortion of the electromagnetic steel sheet 40 due to the compressive stress of the adhesive becomes large. On the other hand, the lower limit value of the width dimension d1 of the adhesive part 41 with respect to the interval dimension d2 between adjacent adhesive parts 41 is appropriately determined within a range that can ensure the adhesive strength between the electromagnetic steel plates 40. For example, the width dimension d1 of the adhesive part 41 can be 1% or more with respect to the distance dimension d2 between adjacent adhesive parts 41.

By making the width dimension d1 of the adhesive part 41 larger than the interval dimension d2 between adjacent adhesive parts 41, the adhesive force between the electromagnetic steel sheets 40 can be increased. There is a possibility that the strain of the electromagnetic steel sheet 40 will increase. For this reason, it is preferable that the direction in which the adhesive portion 41 extends (first direction D1) is brought closer to a direction with high rigidity (direction perpendicular to the rolling direction RD). More specifically, the smaller angle α between the first direction D1 and the rolling direction RD is preferably 0° or more and 5° or less, or 85° or more and 90° or less. In this way, for example, in order to increase the adhesive force between the electromagnetic steel plates 40, even if the width dimension d1 of the adhesive part 41 is within the range of 233±5% with respect to the interval dimension d2 between adjacent adhesive parts 41, Distortion of the electromagnetic steel plate 40 can be suppressed and the magnetic properties of the stator core 21 can be ensured.

Moreover, it is more preferable that the width dimension d1 of the adhesive part 41 is 167% or less, and even more preferably 67% or less of the interval dimension d2 between adjacent adhesive parts 41. As described above, the compressive stress of the adhesive causes distortion in the electrical steel sheet 40, and this distortion increases the core loss of the electrical steel sheet 40. By making the width dimension d1 of the adhesive part 41 smaller than the distance dimension d2 between adjacent adhesive parts 41, it is possible to suppress the distortion of the electromagnetic steel sheet 40 caused by the adhesive and further improve the magnetic properties of the stator core 21. can.
After constructing the stator core 21 as described above, the stator core 21 is subjected to strain relief annealing as described in the section (Electromagnetic steel sheet used for laminated core).

In this embodiment, the rolling directions RD of all the electromagnetic steel sheets 40 forming the stator core 21 coincide with each other. However, the rolling directions RD of all the electromagnetic steel sheets 40 do not have to match. For example, the stator core 21 may be formed by stacking the electromagnetic steel sheets 40. As an example, a stator core in which electromagnetic steel plates 40 are stacked will be specifically described. In the stacked stator core, attention will be paid to one layer of adhesive portion 41 and a set of electromagnetic steel plates 40 sandwiching the layer. The rolling directions RD of the pair of electromagnetic steel sheets 40 sandwiching the adhesive portion 41 layer are different from each other. In this case, the first direction D1 is such that the smaller angle α of the angles formed with the rolling direction RD of the electromagnetic steel sheet 40 located on one side of the lamination direction is included in the above-mentioned preferable angle range, and the lamination direction is It is sufficient that the smaller angle α of the angles formed with the rolling direction RD of the electromagnetic steel sheet 40 located on the other side of is included in the above-mentioned preferable angle range. In the stacked stator core, the first direction D1 of each layer of the adhesive portion 41 provided between the electromagnetic steel plates 40 may be different from each other.

In this embodiment, the rotor core 31 is a laminated core like the stator core 21. That is, the rotor core 31 includes a plurality of electromagnetic steel plates stacked in the thickness direction. In this embodiment, the stacking thickness of the rotor core 31 is equal to that of the stator core 21, and is, for example, 50.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values are just examples, and the stacking thickness, outer diameter, and inner diameter of the rotor core 31 are not limited to these values.

In this embodiment, a plurality of electromagnetic steel plates forming the rotor core 31 are fixed to each other by caulking C (dowels, see FIG. 1). However, the plurality of electromagnetic steel plates 40 forming the rotor core 31 may be bonded together using the same bonding portion as the stator core 21.

(calculation example)
The present inventors conducted numerical analysis (computer simulation) using the following permanent magnet field type three-phase AC motor as the motor to be analyzed. For numerical analysis, finite element method electromagnetic field analysis software JMAG manufactured by JSOL Corporation was used. The shapes of the stator core and rotor core are the same as those shown in FIG.
Stator core outer diameter: 250.0mm
Stator core inner diameter: 165.0mm
Stator core height (stack thickness): 50.0mm
Thickness of electromagnetic steel plate: 0.25mm
Number of poles: 12
Number of slots: 18
Rotor core outer diameter: 163.0mm
Rotor core inner diameter: 30.0mm
Rotor core height: 50.0mm
Rotation speed: 1000rpm

First, the iron loss of the stator core fixed by caulking was calculated. There are two types of stator cores for which iron loss is calculated: those constructed using conventional materials and those constructed using developed materials. FIG. 9 is a diagram showing an example of caulking positions in the stator core. As shown in FIG. 9, here, two positions C _t1 and C _t2 aligned in the radial direction in the circumferential center of the teeth portion of the stator core, and the radial center of the core back portion of the stator core, Positions C _y1 and C _y2 corresponding to the circumferential center of the slot are defined as caulking positions.
In addition, the iron loss of the stator core fixed with an adhesive using the entire plate surface of the electromagnetic steel sheet (the entire plate surface area of the stator core 21 (electromagnetic steel sheet 40) shown in FIG. 2) as the adhesive part (adhesion area) was calculated. There are two types of stator cores for which iron loss is calculated: those constructed using conventional materials and those constructed using developed materials.
The above results are shown in Table 5.

In Table 5, the iron loss ratio is when the iron loss of a stator core made of a conventional material whose entire surface is bonded is normalized as 1.000 (see the column of conventional material/full surface bonding in Table 5). Indicates the value of iron loss. Thus, the values in Table 5 are relative values (dimensionless quantities). As shown in Table 5, even when the entire surface of the electromagnetic steel sheet is used as the adhesive, by using the developed material as the stator core, the iron loss of the stator core can be reduced more than when using the conventional material as the stator core. I know what I can do. In this way, the magnetic properties of the stator core can be improved by using the entire plate surface of the electromagnetic steel sheet as an adhesive portion.

Next, in order to verify more effective measures to suppress the deterioration of iron loss in electrical steel sheets caused by compressive stress in the bonded area, we used the overall striped area as the bonded area of the stay core fixed with adhesive. The iron loss is determined by the ratio of the width dimension d1 of the bonded portion to the distance dimension d2 between adjacent bonded portions (=d1÷d2), and the smaller angle α between the first direction D1 and the rolling direction RD. and were calculated differently. The results are shown in Table 6.

Here, the stator cores for which iron loss is calculated are all made of developed materials. The conditions other than the ratio of the width dimension d1 of the adhesive part to the distance dimension d2 between adjacent adhesive parts (= d1÷d2) and the smaller angle α between the first direction D1 and the rolling direction RD are as follows. , are all the same. In the following description, the ratio of the width dimension d1 of the adhesive part to the interval dimension d2 between adjacent adhesive parts is referred to as the ratio of the width dimension d1 to the interval dimension d2, as necessary. In Table 6, the value of the ratio d2/d1 of the width dimension d1 to the interval dimension d2 is expressed as a percentage.

In Table 6, full-surface adhesion shows the calculation results when using a stator core in which the entire surface of the electromagnetic steel plate is used as the adhesive portion. Model no. 22 shows the results when using a stator core in which the entire plate surface of a developed electrical steel sheet was configured as an adhesive part. Model no. 23 shows the results when using a stator core in which the entire plate surface of a conventional electromagnetic steel plate was configured as an adhesive portion. Model no. 22, No. The iron loss ratios of No. 23 are the values listed in the developed material/full-surface adhesive column of Table 5 and the values listed in the conventional material/full-surface adhesive column of Table 5, respectively. In this way, in Table 6 as well as in Table 5, the iron loss ratio is the iron loss when the iron loss of the stator core, which is constructed with the entire plate surface of the conventional material as the adhesive part, is normalized as 1.000. Show value. Thus, the values of the iron loss ratios in Table 6 are relative values (dimensionless quantities).

Model no. 1~Model No. In the No. 21 stator core 21, a plurality of adhesive portions 41 as shown in FIG. 8 are provided between the electromagnetic steel plates 40. That is, model no. 1~Model No. In the No. 21 stator cores 21, the plurality of adhesive portions 41 extend in a band shape along the first direction D1.

Model no. 1~No. The stator core of No. 7 is the model of the first group. In the first group of models, the ratio d1/d2 of the width dimension d1 to the interval dimension d2 is 233%. That is, in the first group of models, the width dimension d1 of the bonded portion is 233% of the distance dimension d2 between adjacent bonded portions. The width dimension d1 of the adhesive part of each model of the first group is 7 mm, and the interval dimension d2 between the adhesive parts is 3 mm.

Model no. 8~No. The 14 stator cores are the second group model. In the second group of models, the ratio d1/d2 of the width dimension d1 to the interval dimension d2 is 167%. That is, in the second group of models, the width dimension d1 of the bonded portion is 167% of the distance dimension d2 between adjacent bonded portions. The width dimension d1 of the adhesive part of each model of the second group is 5 mm, and the interval dimension d2 between the adhesive parts is 3 mm.
Model no. 15~No. 21 stator cores are the third group model. In the third group of models, the ratio d1/d2 of the width dimension d1 to the interval dimension d2 is 67%. That is, in the third group of models, the width dimension d1 of the bonded portion is 6% of the distance dimension d2 between adjacent bonded portions. The width dimension d1 of the adhesive part of each model of the third group is 2 mm, and the interval dimension d2 between the adhesive parts is 3 mm.

In the first group, second group, and third group, the smaller angle α (see FIG. 8) between the first direction D1 and the rolling direction RD is set to 0°, 15°, 30°, and 45°. , 60°, 75° and 90° models were prepared.

FIG. 10 is a diagram showing an example of the relationship between the iron loss ratio and the smaller angle α between the angles formed by the first direction D1 and the rolling direction RD. In FIG. 10, graphs 1001, 1002, and 1003 for 233%, 167%, and 67% indicate the values of the first group model, second group model, and third group model in Table 6, respectively. Further, a graph 1004 shows the iron loss ratio of a stator core constructed by fixing conventional electromagnetic steel plates by caulking. Graph 1004 was created from the values in the conventional material/crimping column of Table 5. Graph 1005 shows the iron loss ratio of a stator core constructed by fixing developed electrical steel sheets by caulking. Graph 1005 was created from the values in the developed material/crimping column of Table 5. When fixing the electromagnetic steel sheet by caulking, there is no concept of the smaller angle α between the first direction D1 and the rolling direction RD. Therefore, as shown in graphs 1004 and 1005, the iron loss ratio of a stator core constructed by fixing conventional and developed electrical steel sheets by caulking takes a constant value regardless of the angle α. In addition, a graph 1006 shows the iron loss ratio of a stator core constructed by fixing the electromagnetic steel plate with an adhesive using the entire surface of the developed electromagnetic steel plate as an adhesive portion. Graph 1006 was created from the values in the Developed Material/Full Surface Adhesion column of Table 5. Even when the entire surface of the electromagnetic steel sheet is used as a bonding portion, there is no concept of the smaller angle α between the angles formed by the first direction D1 and the rolling direction RD. Therefore, as shown in graph 1006, the iron loss ratio of the stator core constructed by fixing the electromagnetic steel plate with adhesive using the entire plate surface of the conventionally developed electromagnetic steel plate as the adhesive part is independent of the angle α. A constant value.

As shown in FIG. 10, the values of graphs 1001 to 1003 are smaller than the values of graph 1004 at any angle α. In this way, model no. 1~Model No. It was confirmed that no matter which one of the 21 stator cores is used, the deterioration of the iron loss of the stator core can be suppressed more than when using a stator core configured by fixing conventional electromagnetic steel plates by caulking. As shown in Table 5 and Figure 10, the iron loss (see graph 1004) when using a stator core constructed by fixing conventional electrical steel sheets by caulking is the same as the iron loss (see graph 1004) when the entire plate surface of the developed electrical steel sheets is used. This is lower than the iron loss (see graph 1006) when using a stator core configured by fixing electromagnetic steel plates with an adhesive as an adhesive part. Model no. 1~Model No. By using the stator core of model no. Deterioration of iron loss of the stator core can be suppressed more than when using 23 stator cores.

In addition, in Table 6 and FIG. 10, in any of the models of the first group to the third group, the iron when the smaller angle α between the first direction D1 and the rolling direction RD is 45°. The loss ratio is maximum, but as the angle α moves away from 45°, the iron loss ratio tends to decrease (see graphs 1001 to 1003 in FIG. 10). By setting the smaller angle α between the first direction D1 and the rolling direction RD to a range of 0° to 30°, or a range of 60° to 90°, the iron loss of the stator core can be reduced. It was confirmed that the deterioration of

Comparing the models of the first to third groups with each other, the models of the third group have the smallest iron loss, and the models of the first group have the largest iron loss.
In FIG. 10, as can be seen by comparing graphs 1001 and 1005, in the first group of models (model No. 1 to model No. 7), the smaller of the angles formed by the first direction D1 and the rolling direction RD If the angle α is in the range of 0° or more and 5° or less, or 85° or more and 90° or less, the stator core will It was confirmed that deterioration of iron loss can be suppressed.

However, as shown in Table 5 and Figure 10, the iron loss (graph 1005) when using a stator core constructed by fixing the developed electromagnetic steel plate by caulking is the same as the iron loss (graph 1005) when the conventional electromagnetic steel plate is fixed by caulking. Iron loss when using the constructed stator core (see graph 1004), and when using a stator core constructed by fixing the electromagnetic steel plate with an adhesive using the entire plate surface of the developed electromagnetic steel plate as the adhesive part. It is smaller than the iron loss (see graph 1006). For this reason, model no. 1~Model No. When using the stator core No. 7, the smaller angle α between the first direction D1 and the rolling direction RD is not in the range of 0° or more and 5° or less, or in the range of 85° or more and 90° or less. This range is a preferable range.

The range of the angle α between the first direction D1 and the rolling direction RD (the range of 0° or more and 5° or less, and the range of 85° or more and 90° or less) is the ratio of the width dimension d1 to the interval dimension d2. Even if d1/d2 is ±5% with respect to 233% (that is, even if the ratio d1/d2 of width dimension d1 to interval dimension d2 is within the range of 228% or more and 238% or less). It was confirmed.

In addition, in the second group of models (Model No. 8 to Model No. 14), the smaller angle α between the first direction D1 and the rolling direction RD is any angle (0° or more and 90° or more). It was confirmed that deterioration of the iron loss of the stator core can be suppressed more than when using a stator core constructed by fixing developed electromagnetic steel sheets by caulking, even if the stator core is crimped. Furthermore, in the models of the third group (Model No. 15 to Model No. 21), deterioration of the iron loss of the stator core is suppressed more than in the models of the second group (Model No. 8 to Model No. 14). It has been confirmed that this is possible. It is considered that by reducing the ratio d1/d2 of the width dimension d1 to the interval dimension d2, distortion of the electromagnetic steel sheet 40 caused by the adhesive was suppressed, and the magnetic properties of the stator core were ensured.

In the example shown in Table 6 and FIG. 10, if the ratio d1/d2 of the width dimension d1 to the interval dimension d2 is 167% or less, deterioration of iron loss of the electrical steel sheet can be further suppressed, and the width dimension to the interval dimension d2 It was confirmed that when the ratio d1/d2 of d1 was set to 67% or less, deterioration of the iron loss of the electrical steel sheet 40 could be further suppressed.

(summary)
As described above, in this embodiment, adhesive is used to bond between adjacent electromagnetic steel plates 40 in the stacking direction of a plurality of electromagnetic steel plates 40 stacked so that the plate surfaces of the electromagnetic steel plates 40 face each other. form a section. Therefore, the magnetic properties of the stator core 21 can be improved more than when the entire plate surface of a conventional electromagnetic steel sheet is used as an adhesive portion. Thereby, the loss (iron loss) of the rotating electric machine 10 can be reduced.

Further, in the present embodiment, when viewed from the stacking direction, the strips are formed in a band shape extending in the first direction D1, and are arranged side by side with intervals in the second direction D1 orthogonal to the first direction D1. A plurality of adhesive portions 41 are formed so as to be bonded. At this time, the smaller angle α between the first direction D1 and the rolling direction of the electromagnetic steel sheet 40 is set to be 0° or more and 30° or less, or 60° or more and 90° or less. Therefore, the magnetic properties of the stator core 21 can be improved more than when the entire plate surface of the electromagnetic steel sheet 40 is used as the adhesive portion.

Further, in the present embodiment, the width dimension d1 of the bonded portion 41 is set to 233% or less of the distance dimension d2 between adjacent bonded portions 41. Therefore, the magnetic properties of the stator core 21 can be improved more than when conventional electromagnetic steel plates are fixed by caulking.

In the present embodiment, the smaller angle α between the first direction D1 and the rolling direction RD is in the range of 0° or more and 5° or less, and in the range of 85° or more and 90° or less. do. Therefore, the magnetic properties of stator core 21 can be further improved. In particular, when the width dimension d1 of the adhesive part 41 is within the range of 233±5% with respect to the interval dimension d2 between adjacent adhesive parts 41, by doing this, the adhesive strength between the electromagnetic steel sheets 40 is increased. At the same time, the magnetic properties of the stator core 21 can be improved more than when the developed electromagnetic steel sheet is fixed by caulking.

Further, in the present embodiment, the width dimension d1 of the bonded portion 41 is 167% or less of the distance dimension d2 between adjacent bonded portions 41. Therefore, deterioration of the magnetic properties of the stator core 21 can be further suppressed. If the width dimension d1 of the bonded portions 41 is set to 67% or less of the distance dimension d2 between adjacent bonded portions 41, deterioration of the magnetic properties of the stator core 21 can be further suppressed.

(Modified example)
<Modification 1>
The present embodiment has been described using an example in which both ends of the adhesive portion 41 in the width direction have a linear shape. However, the shape of the adhesive portion is not limited to this shape. For example, the following may be used.
FIG. 11 is a diagram showing a modification of the configuration of the adhesive part.
In FIG. 11, a plurality of bonded parts 141 are provided between the electromagnetic steel plates 40. Each adhesive portion 141 is formed in a band shape on the plate surface of the electromagnetic steel sheet 40 along the first direction D1 when viewed from the lamination direction. Further, the plurality of adhesive parts 141 are arranged at equal intervals in the second direction D2. Two bonded parts located adjacent to each other with a gap in the second direction D2 are spaced apart by the gap dimension d2.

The adhesive part 141 has a plurality of element adhesive parts 141c arranged along the first direction D1. The element adhesive portions 141c are a plurality of adhesive lumps that are lined up along the first direction D1 and constitute the adhesive portion 141. The plurality of element bonding parts 141c have substantially the same shape, but may have mutually different shapes. Element adhesion parts 141c located at adjacent positions in the first direction D1 are connected to each other. Each element bonding portion 141c has a substantially elliptical shape with the long axis in the first direction D1 when viewed from the stacking direction. Therefore, both ends of the adhesive portion 141 in the width direction extend in a meandering manner along the first direction D1. The shape of the element bonding portion 141c is not limited to a substantially elliptical shape, and may be, for example, a substantially circular shape. As shown in FIG. 11, the plurality of bonded parts extending in a strip shape along the first direction D1 described in this embodiment do not necessarily have straight ends in the width direction (second direction D2). Instead, it may be curved along the first direction D1.

The adhesive portion 141 extends along the center line CL with the center line CL parallel to the first direction D1. The adhesive portion 141 has a shape that is symmetrical about the center line CL.
As shown in this modification, when both ends of the adhesive portion 141 in the width direction extend in a meandering manner, the width dimension d1 of the adhesive portion 141 can be defined as follows. That is, the width dimension d1 of the adhesive part 141 is defined by setting a virtual line VL that approximates both ends of the adhesive part 141 in the width direction in a straight line. The virtual line VL extends substantially parallel to the center line CL. The pair of virtual lines VL are virtual straight lines defined such that the area of the region sandwiched between the pair of virtual lines VL is equal to the area of the adhesive portion 141 when viewed from the stacking direction.

In this modification, the width dimension d1 of the adhesive portion 141 is the distance dimension along the second direction D2 between the pair of virtual lines VL. Furthermore, in this modification, the interval dimension d2 is the distance dimension between the virtual lines VL of adjacent adhesive parts 141 in the second direction D2.

The adhesive part 141 shown in this modification can have the same effect as the adhesive part 41 in this embodiment described above. This kind of adhesive part 141 is formed by, for example, applying adhesive from a plurality of dispensers to the electromagnetic steel sheet 40 in a plurality of points along the first direction D1, and then attaching this electromagnetic steel sheet 40 to another electromagnetic steel sheet 40. It is formed by pressing and compressing the adhesive between both electromagnetic steel plates 40. In this way, even if the width dimension of the adhesive portion 141 is non-uniform, the same effects as in this embodiment described above can be obtained.

<Modification 2>
The present embodiment has been described using an example in which the range in which the striped adhesive portions are provided is the entire in-plane area of the electromagnetic steel sheet. However, the range in which the striped adhesive portions are provided may be a partial range within the plane of the electromagnetic steel sheet (the striped adhesive portions may be provided partially within the plane of the electromagnetic steel sheet). . For example, striped adhesive portions may be provided only in the region overlapping the core back portion 22 of the electromagnetic steel sheet 40. Further, striped adhesive portions may be provided only in the region overlapping the teeth portions 23 of the electromagnetic steel sheet 40.

<Modification 3>
The shape of the stator core is not limited to the shape shown in FIG. Specifically, the dimensions of the outer and inner diameters of the stator core, the stacking thickness, the number of slots, the circumferential and radial dimension ratio of the teeth section, the radial dimension ratio of the teeth section and the core back section, etc. are set to the desired values. It can be arbitrarily designed according to the characteristics of the rotating electric machine.

<Modification 4>
In this embodiment, the rotor 30 in which one magnetic pole is formed by a set of two permanent magnets 32 has been described as an example. However, the configuration of the rotor is not limited to this. For example, one permanent magnet 32 may form one magnetic pole, or three or more permanent magnets 32 may form one magnetic pole.

<Modification 5>
Although the present embodiment has been described using an inner rotor type rotating electrical machine as an example, the rotating electrical machine is not limited to this. For example, it may be an outer rotor type rotating electric machine. Further, in the present embodiment, a radial gap type rotating electrical machine in which the stator 20 and the rotor 30 face each other with a gap in the radial direction has been described as an example, but the rotating electrical machine is not limited to this. For example, it may be an axial gap type rotating electric machine in which a stator and a rotor face each other with a gap in the axial direction.

Furthermore, in the present embodiment, a permanent magnet field type electric motor has been described as an example of the rotating electric machine 10. However, the structure of the rotating electric machine is not limited to this as illustrated below, and various known structures not illustrated below can also be adopted.
First, in the present embodiment, a permanent magnet field type motor is used as an example of the synchronous motor, but the rotating electric machine is not limited to this. For example, the rotating electric machine may be a reluctance type motor or an electromagnetic field type motor (wire-wound field type motor). Furthermore, in the present embodiment, a synchronous motor has been described as an example of the AC motor, but the rotating electric machine is not limited to this. For example, the rotating electric machine may be an induction motor. Further, in the present embodiment, an AC motor is used as an example of the electric motor, but the rotating electric machine is not limited to this. For example, the rotating electrical machine may be a DC motor. Further, in the present embodiment, an electric motor has been described as an example of the rotating electrical machine, but the rotating electrical machine is not limited to this. For example, the rotating electric machine may be a generator.

<Modification 6>
In this embodiment, the case where the laminated core is applied to the stator core has been described as an example. However, the laminated core can be applied to other than stator cores. For example, it is also possible to apply a laminated core to the rotor core. Moreover, it is also possible to employ the laminated core in a transformer instead of a rotating electric machine.

In addition, without departing from the spirit of the present invention, it is possible to replace the components in the above-described embodiments and modifications thereof with well-known components as appropriate, and also combine some or all of the modifications as appropriate. Good too.

<Other variations>
The embodiments of the present invention described above are merely examples of implementation of the present invention, and the technical scope of the present invention should not be construed as limited by these. It is something. That is, the present invention can be implemented in various forms without departing from its technical idea or main features.

10: Rotating electric machine, 20: Stator, 21: Stator core (laminated core), 30: Rotor, 40: Electromagnetic steel plate, 41, 141: Adhesive part, 50: Case, 60: Rotating shaft, D1: First direction, D2 : second direction, d1: width dimension, d2: interval dimension, RD: rolling direction, α: angle, O: center axis

Claims (5)

A plurality of electromagnetic steel plates stacked so that the plate surfaces face each other,
an adhesive part disposed in at least a part of the area between the electromagnetic steel plates adjacent to each other in the lamination direction, and for bonding the electromagnetic steel plates to each other;
The electromagnetic steel sheet is
In mass%,
C: 0.0100% or less,
Si: 1.50% to 4.00%,
sol. Al: 0.0001% to 1.0%,
S: 0.0100% or less,
N: 0.0100% or less,
One or more types selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, and Au: 2.50% to 5.00% in total,
Sn: 0.000% to 0.400%,
Sb: 0.000% to 0.400%,
P: 0.000% to 0.400%, and one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: 0.0000% to 0 in total Contains .0100%,
Mn content (mass%) is [Mn], Ni content (mass%) is [Ni], Co content (mass%) is [Co], Pt content (mass%) is [Pt], Pb content amount (mass %) is [Pb], Cu content (mass %) is [Cu], Au content (mass %) is [Au], Si content (mass %) is [Si], sol. The Al content (mass%) was determined by [sol. Al], the following formula ( 1 ) is satisfied,
The remainder has a chemical composition consisting of Fe and impurities,
B50 in the rolling direction is B50L, B50 in the direction where the angle with the rolling direction is 90° is B50C, and B50 in one of the two directions where the smaller angle with the rolling direction is 45°. B50 and B50 in the other direction are respectively B50D1 and B50D2, the following formulas ( 2 ) and ( 3 ) are satisfied, and the X-ray random intensity ratio of {100}<011> is 5 or more and less than 30 , the plate thickness is 0.50 mm or less,
The adhesive part has an adhesive,
A plurality of the adhesive portions are provided between the electromagnetic steel sheets that are adjacent to each other in the lamination direction,
When viewed from the stacking direction, each of the plurality of adhesive portions extends in a first direction,
The plurality of adhesive parts are arranged in a line with intervals in a second direction perpendicular to the first direction,
A laminated core characterized in that the angle between the first direction and the rolling direction of the electromagnetic steel sheet is 0° or more and 30° or less, or 60° or more and 90° or less .
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])-([Si]+[sol.Al])>0%...( 1 )
(B50D1+B50D2)/2>1.7T...( 2 )
(B50D1+B50D2)/2>(B50L+B50C)/2...( 3 ) The laminated core according to claim 1 , wherein a width dimension of the bonded portion is 233% or less of a width dimension of the bonded portions located at adjacent positions with a gap in the second direction. . The laminated core according to claim 2 , wherein the angle between the first direction and the rolling direction of the electromagnetic steel sheet is 0° or more and 5° or less, or 85° or more and 90° or less. Any one of claims 1 to 3 , wherein the width dimension of the adhesive part is 167% or less of the interval dimension of the adhesive parts located at adjacent positions with an interval in the second direction. The laminated core according to item 1. A rotating electric machine comprising the laminated core according to any one of claims 1 to 4 .

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