JP2019102692A - Stacked core - Google Patents

Abstract

To easily achieve a reduction of noise that is generated from a stacked core.SOLUTION: A stacked core is configured using at least two types of magnetic material plates having magnetostrictive time waveforms 320a-320c different from each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stacked core, and is particularly suitable for use in forming a core by laminating magnetic plates.

  In an electric device using a laminated core formed of magnetic material plates, the magnetic material plate vibrates due to the deformation due to the magnetostriction of the magnetic material plate such as an electromagnetic steel plate constituting the laminated iron core, and this vibration generates noise. Sometimes. For example, a transformer, which is a type of such electrical equipment, may be installed in or near a residential area, such as a substation. In recent years, with the increasing awareness of the living environment, there is a strong demand for reduction of noise generated from such transformers.

Then, there exist a technique of patent document 1, 2 as a technique which suppresses the vibration of a pile core.
Patent Document 1 discloses a technology relating to a grain-oriented electrical steel sheet in which magnetic domains are subdivided by strain introduced in a line in a surface crossing a rolling direction. Specifically, in Patent Document 1, a magnetostriction displacement obtained by generating a magnetization in the rolling direction of a steel plate whose maximum value changes by a sine wave of frequency f at 1.7 T and measuring a change in the length of the magnetization direction. In the waveform, a technique for setting the amplitude of the magnetostrictive component at a frequency of 4f (fourth frequency) to 0.03 × 10 ^-6 or less is described.

  Patent Document 2 describes that the average value of Δ | θ | / d in the entire steel plate is 1.0 ° / cm or less. Here, θ is an angle that the [001] axis direction closest to the rolling surface of the secondary recrystallized grain makes with the rolling surface, and Δ | θ | is between crystal grains adjacent in the direction orthogonal to the rolling direction Of the absolute values of the angle θ of d is the distance between the centers of gravity of crystal grains adjacent to each other in the direction perpendicular to the rolling direction in the secondary grain structure.

JP, 2017-128765, A Japanese Patent Application Laid-Open No. 11-92889

  However, in the techniques described in Patent Literatures 1 and 2, only the reduction of the magnetostriction of the magnetic steel sheet itself constituting the pile core is considered. Moreover, in order to realize the electromagnetic steel sheet as defined in Patent Documents 1 and 2, a special material must be used. Therefore, it is not easy to reduce the noise generated from the pile core.

  The present invention has been made in view of the above problems, and an object thereof is to easily realize the reduction of the noise generated from the pile core.

  The laminated core according to the present invention is a laminated core formed by stacking a plurality of magnetic plates, and the plurality of magnetic plates have mutually different time waveforms of magnetostriction when the stacked core is excited. It is characterized by including at least two types of magnetic plates.

  According to the present invention, it is possible to easily realize the reduction of the noise generated from the piled iron core.

It is a figure which shows the 1st example of a pile core. It is a figure which shows the 2nd example of a pile core. It is a figure which shows notionally an example of the time waveform of the magnetostriction of a magnetic board, and a magnetic flux density. It is a figure which shows the 1st example of the laminated structure of a magnetic board. It is a figure showing the 2nd example of lamination composition of a magnetic board. It is a figure which shows the 3rd example of the laminated structure of a magnetic board.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The X, Y, and Z coordinates of each figure show the relationship of the orientation of each figure. A circle with a circle indicates a direction from the back to the front of the paper, and a circle with a circle indicates a direction from the front to the back of the paper Show.

(Schematic configuration of stacked iron core)
FIG. 1 is a diagram showing a first example of a pile core. FIG. 1 (a) is a plan view of a pile core (a view from the top of the pile core). FIG.1 (b) is a figure which shows the surface of the laminated core seen from the direction shown by the arrow line I shown in FIG. FIG.1 (c) is a figure which shows the surface of the laminated core seen from the direction shown by arrow line II shown in FIG.

In FIG. 1, the pile core has two yoke parts (relay parts) 110a and 110b and two rim parts (legs) 120a and 120b.
The yoke portions 110a and 110b have the same configuration. The rim portions 120a, 120b have the same configuration.

  The yoke portions 110a and 110b are configured by stacking a plurality of magnetic plates. In the present embodiment, the case where the magnetic material plates constituting the yoke portions 110a and 110b are a directional electromagnetic steel sheet which is a kind of soft magnetic material plate will be described as an example. In the example shown in FIGS. 1 (a) and 1 (b), it is a directional electromagnetic steel sheet cut out according to the planar shape (trapezoidal shape) of the yoke portions 110a and 110b, and a plurality of directionalities with the same thickness The yoke portions 110a and 110b are formed by stacking the electromagnetic steel plates.

The rim portions 120a and 120b are also configured by stacking a plurality of magnetic plates. In the present embodiment, the case where the magnetic material plates constituting the rim portions 120a and 120b are a directional electromagnetic steel plate which is a kind of soft magnetic material plate will be described as an example. In the example shown in FIGS. 1 (a) and 1 (c), it is a directional electromagnetic steel sheet cut out according to the planar shape (trapezoidal shape) of the rim portions 120a and 120b, and a plurality of directionalities of the same thickness The rim portions 120a and 120b are configured by stacking the electromagnetic steel plates. A coil is wound around the rims 120a and 120b. When a piled iron core is used as a core of a transformer, a primary coil (excitation coil to which an excitation voltage is applied) and a secondary coil (a coil that outputs a voltage after voltage transformation) are wound around rim portions 120a and 120b. Be done. When an exciting current flows through the primary coil, a closed magnetic path is formed in the yoke portions 110a and 110b and the rim portions 120a and 120b. The stacked core shown in FIG. 1 can be used, for example, as a core of a single phase transformer.
Here, the width of the yoke portions 110a and 110b (length in the Y-axis direction in FIG. 1A) and the width of the rim portions 120a and 120b (length in the X-axis direction in FIG. 1A) are substantially the same. It is.

  FIG. 2 is a view showing a second example of the laminated core. FIG. 2 (a) is a plan view of the pile core (a view from the top of the pile core). FIG.2 (b) is a figure which shows the surface of the laminated core seen from the direction shown by the arrow line I shown in FIG. FIG.2 (c) is a figure which shows the surface of the laminated core seen from the direction shown by arrow line II shown in FIG. FIG.2 (d) is a figure which shows the surface of the laminated core seen from the direction shown by arrow line III shown in FIG.

In FIG. 2, the piled iron core has two yoke parts (laying parts) 210 a and 210 b and three rim parts (legs) 220 a, 220 b and 220 c.
The yoke portions 210a and 210b have the same configuration. The rims 220a, 220b have the same configuration. The rims 220a and 220b and the rim 220c have different shapes.

  The yoke portions 210a and 210b are configured by stacking a plurality of magnetic plates. In the present embodiment, the case where the magnetic material plates constituting the yoke portions 210a and 210b are a directional electromagnetic steel sheet which is a kind of soft magnetic material plate will be described as an example. In the example shown in FIGS. 2 (a) and 2 (b), the yoke portions 210a and 210b are cut out according to the planar shape (a shape in which the shorter base of the trapezoid is recessed according to the shape of the rim portion 220c) The yoke portions 210a and 210b are formed by stacking a plurality of directional electromagnetic steel plates having the same thickness.

The rims 220a, 220b, 220c are also configured by stacking a plurality of magnetic plates. In the present embodiment, the case where the magnetic material plates constituting the rim portions 220a, 220b and 220c are a directional electromagnetic steel sheet which is a kind of soft magnetic material plate will be described as an example. In the example shown in FIGS. 2 (a) and 2 (c), it is a directional electromagnetic steel sheet cut out according to the planar shape (trapezoidal shape) of the rim portions 220a, 220b, and a plurality of directionalities of the same thickness The rim portions 220a and 220b are configured by stacking the electromagnetic steel plates. Moreover, in the example shown in FIG. 2A and FIG. 2D, it is a directionality electromagnetic steel plate cut out according to the planar shape (hexagon) of the rim portion 220c, and a plurality of directionality of the same thickness The rim portion 220c is configured by stacking the electromagnetic steel plates. The magnetic plates used for the rims 220a, 220b, 220c are of the same type of grain-oriented electrical steel.
Here, the width of the yoke portions 210a and 210b (the length in the Y-axis direction in FIG. 2A) and the width of the rim portions 220a, 220b and 220c (the length in the X-axis direction in FIG. 2A) Are approximately the same.

  A coil is wound around the rims 220a, 220b, 220c. When the piled iron core is used as the iron core of the transformer, the primary coil and the secondary coil are wound around the rim portions 220a, 220b, 220c. When an exciting current flows through the primary coil, a closed magnetic circuit is formed in the yokes 210a, 210b and the rims 220a, 220b, 220c. The stacked core shown in FIG. 2 can be used, for example, as a core of a three-phase transformer.

  The piled iron core shown in FIGS. 1 and 2 is an example. As long as it is a stacked core used for electrical equipment such as a transformer, the configuration of the stacked core is not limited to those shown in FIGS. 1 and 2. Moreover, a magnetic material board is not limited to a directional electromagnetic steel plate, For example, a non-directional electromagnetic steel plate may be sufficient. Both of the non-oriented electrical steel sheet and the directional electrical steel sheet may be used as the magnetic plate.

(Viewpoints)
The present inventors paid attention to the time waveform (the relationship between the magnetostriction and the time) of the magnetostriction λ in the magnetic substance plate (in the present embodiment, the directional electrical steel sheet) configured as the piled iron core. The magnetostriction λ is represented by (Δl / l) × 10 ⁶ [ppm]. l is the length of the magnetic plate before the application of the magnetic field in the direction in which the magnetic field is applied (the magnetization direction). Δl is a value obtained by subtracting the length (= 1) of the magnetic plate before applying the magnetic field in the direction in which the magnetic field is applied from the length after applying the magnetic field of the magnetic plate in the direction in which the magnetic field is applied. is there.

FIG. 3: is a figure which shows notionally an example of the time waveform of the magnetostriction of a magnetic board, and a magnetic flux density. 3 (a), 3 (b) and 3 (c) conceptually show an example of the temporal waveforms of the magnetostriction and the magnetic flux density of the magnetic plates A, B and C, respectively, whose magnetostrictive temporal waveforms are different from each other. FIG.
In FIG. 3 (a) to FIG. 3 (c), the magnetic flux density and the magnetostriction are normalized respectively, and their units are considered as dimensionless quantities [in FIG. 3 (a) to FIG. 3 (c) -] Shows that it is a dimensionless quantity). Further, in FIG. 3A to FIG. 3C, one period of the time waveform 310 of the magnetic flux density is T. In addition, one period T of the time waveform 310 of magnetic flux density is a period (= 1 / f) corresponding to the excitation frequency f. Further, as shown in FIGS. 3A to 3C, one period of the magnetostrictive time waveforms 320a to 320c is 1/1 of one period T of the magnetic flux density time waveform 310 (corresponding to the excitation frequency). 2

  Each magnetic body vibrates due to the magnetostriction of each magnetic plate that constitutes the pile core, and this vibration causes vibration of air or insulating oil, and the vibration of air or insulating oil becomes vibration of the surface of the container or structural member, causing noise and Become. Therefore, the inventors of the present invention applied the time waveform of the magnetostriction of each magnetic plate when applying a magnetic field in the same direction as the magnetic field applied to the pile core at the time of excitation (that is, each magnetic body when the pile core was excited). By changing the magnetostrictive time waveforms of the plates, it was conceived that it would be good if they cause interference such that they mutually weaken each other. By doing this, the air vibrations caused by the vibration of the magnetic material plate interfere with each other to weaken each other, and as a result, the vibrations of the storage core are reduced. In the following description, the time waveform of the magnetostriction of the magnetic plate when the magnetic field is applied in the same direction as the magnetic field applied to the pile core at the time of excitation will be abbreviated as the time waveform of the magnetostriction as needed.

(Method to make the time waveform of magnetostriction different)
As a first method of varying the time waveform of magnetostriction, there is a method of performing magnetic domain fragmentation on a magnetic plate. Magnetic domain fragmentation is a method of introducing local strain on the surface of a magnetic plate to fragment magnetic domains. For example, magnetic domain fragmentation can be realized by scoring the surface of the magnetic plate with a ballpoint pen, irradiating a laser beam, irradiating an electron beam, or irradiating a plasma. By these methods, for example, strain can be linearly introduced so as to be substantially orthogonal to the rolling direction of the magnetic plate. Since the magnetic domain refinement itself can be realized by a known technique, the detailed description thereof is omitted.

  The magnetostrictive time waveform can be made different by changing at least one of the number, the magnitude, and the shape of the distortion introduced by the magnetic domain fragmentation. Also, magnetic plates having different magnetostriction time waveforms can be obtained by using a magnetic plate (so-called plane material) not subjected to magnetic domain fragmentation and a magnetic plate subjected to magnetic domain fragmentation (so-called magnetic domain control material). Can be realized.

As a second method of making the time waveform of magnetostriction different, there is a method of using a plurality of types of magnetic material plates having different components as a piled iron core. For example, by changing the amounts of Si and Al, which are the main components of the grain-oriented electrical steel sheet, it is possible to realize magnetic material sheets having different magnetostriction time waveforms.
As a third method of varying the time waveform of magnetostriction, there is a method of using a magnetic plate obtained by changing the cutting direction from the same magnetic plate as a pile core. For example, from the same magnetic material plate, a magnetic material plate cut out so that the direction of the magnetic field applied to the pile core is different from the rolling direction and a direction different from the rolling direction (for example, a direction perpendicular to the rolling direction) It can be used for piled iron cores.
In addition, at least two of the first method, the second method, and the third method described above may be combined. The method is not limited to the first method, the second method, and the third method as long as the magnetostrictive time waveform can be made different.

  The number of types of magnetic material plates having different magnetostriction time waveforms may be two, three, four, or more, which are used for one piled iron core. When the number of types of magnetic plates having different magnetostriction time waveforms used for one piled iron core increases, the noise reduction effect of the piled iron core is enhanced, but it is necessary to prepare various types of magnetic plates. From such a point of view, two or more types of magnetic material plates having different magnetostrictive time waveforms may be used for one piled iron core, and three or more types are preferable.

(Specification of time waveform of magnetostriction)
As described above, the time waveform of magnetostriction in the magnetic material plate can be made different. It is most preferable to make the magnetostriction time waveforms of multiple magnetic plates completely cancel each other, and make the magnetostriction 0 (zero) by combining (overlaying) the time waveforms of each magnetostriction. It is not easy to do. Therefore, the present inventors have found that if at least one (preferably two, more preferably three) of the following three conditions is satisfied, the noise reduction effect of the pile core can be obtained. I found it.

The first condition is that the magnetostriction of each of the magnetostrictive time waveforms (in the example shown in FIG. 3, the magnetostriction time waveforms 320a, 320b, and 320c of the magnetic boards A, B, and C in the example shown in FIG. The condition is to make the phase different when the absolute value of x becomes maximum.
Specifically, the difference in phase when the absolute value of the magnetostriction is maximum in each of the magnetostriction time waveforms of at least two types of magnetic material plates different from each other in magnetostriction time waveform mutually differs by more than 0 °, preferably 5 °. More preferably, it is 10 ° or more.

In the example shown in FIG. 3 (a), the time when the absolute value of the magnetostriction becomes maximum at time waveform 320a of magnetostriction of the magnetic plate A is t _1. Here, the period of the magnetostrictive time waveforms 320a, 320b, and 320c of the magnetic plates A, B, and C is T '(= T / 2). Then, the phase corresponding to this time t ₁ is t ₁ × 360 ÷ T ′ (t ₁ : T ′ = phase: 360 °). Similarly, in the example shown in FIG. 3 (b), FIG. 3 (c), the magnetic plates B, the time which the time waveform 320b magnetostriction and C, the absolute value of the magnetostriction in 320c is maximized is t _2. The phases corresponding to the times t ₂ and t ₃ are t ₂ × 360 ÷ T ′ and t ₃ × 360 ÷ T ′.

FIGS. 3 (a) in the example shown in to FIG. 3 (b), the difference between the phase corresponding to the phase and time t ₂ corresponding to the time t ₁ as described above, the phase and the time t corresponding to the time t ₁ The difference between the phase corresponding to ₃ and the difference between the phase corresponding to time t ₂ and the phase corresponding to time t ₃ is more than 0 °, preferably 5 ° or more, more preferably 10 ° or more To be

  The second condition is that the maximum area of the area in one period of the magnetostrictive time waveform of each of at least two types of magnetic plates different in magnetostriction time waveform mutually differs at least in the magnetostrictive time waveform mutually different The condition is that the area in one period of the magnetostrictive time waveform obtained by combining the magnetostrictive time waveforms of the two types of magnetic plates is exceeded. In this way, it is possible to reduce the vibration of the iron core due to the magnetostriction of the magnetic material plate (the magnetic material plate having the largest area in one period of the magnetostriction time waveform) that most affects the vibration of the pile core. Since it can be done, the vibration of the core can be reduced as a whole.

  The third condition is that at least the minimum area of the area in one period of the magnetostriction time waveform of each of at least two types of magnetic plates different in magnetostriction time waveform mutually differs at least in the magnetostriction time waveform mutually different The condition is that the area in one period of the magnetostrictive time waveform obtained by combining the magnetostrictive time waveforms of the two types of magnetic plates is exceeded. In this way, it is possible to reduce the vibration of the piled iron core as compared with the case of using only any one of the magnetic sheets of at least two kinds of magnetic sheets different in time waveform of magnetostriction as the piled iron core. If the third condition is satisfied, the second condition described above is automatically satisfied.

  Under the second and third conditions, the area of the magnetostrictive time waveform is the same as the magnetostriction time waveform having a positive value of the magnetostriction time waveform and the magnetostriction time waveform having a negative value of the magnetostriction time waveform. It can be obtained by multiplying the value by (-1) (that is, the area of the magnetostrictive time waveform can be obtained by integrating the magnetostrictive time waveform over one period after taking the absolute value of the magnetostriction ).

  In addition, when two types of magnetic plates different in time waveform of magnetostriction are used, the time waveform of magnetostriction in one magnetic plate and the time waveform of magnetostriction in the other magnetic plate are opposite in phase in one period. The percentage of time during which the time interval is 10% or more may be 10% or more, preferably 20% or more, and more preferably 30% or more. Here, the opposite phase refers to a state in which the sign of the magnetostriction in one magnetic plate and the sign of the magnetostriction in the other magnetic plate are reversed at the same time. In one cycle of the magnetostrictive time waveform, the value obtained by dividing the integrated value of the time in which the state is in this state by one cycle of the magnetostrictive time waveform is the magnetostriction time waveform of one magnetic plate and the other. It is a ratio of time in which the time waveform of magnetostriction in the magnetic plate is in antiphase in one cycle.

(Part to apply)
It is sufficient to use at least two types of magnetic plates different in time waveform of magnetostriction in any region of the stack iron core.
For example, in the example illustrated in FIG. 1, a stacked iron core is configured by combining the yoke portion 110 a, the yoke portion 110 b, the rim portion 120 a, and the rim portion 120 b. In the example shown in FIG. 2, a yoke is configured by combining the yoke portion 210a, the yoke portion 210b, the rim portion 220a, the rim portion 220b, and the rim portion 220c. The lamination configuration of the magnetic plate in at least one block of the plurality of blocks to be combined can be different from the lamination configuration of the other blocks and the magnetic plate. The lamination configuration of the magnetic plates is determined using at least one of the stacking position of the magnetic plates and the time waveform of magnetostriction.

  For example, even if the same number of three magnetic plates having different magnetostrictive time waveforms are used in one block and another block, the lamination configuration of the magnetic plates is different if the stacking manner is different. It will be different.

  In addition, even if the magnetic plate with the same magnetostriction time waveform is used in one block, if the magnetic plate with different magnetostriction time waveform is used in at least two blocks, the laminated configuration of the magnetic plate is It will be different. For example, in FIG. 1, the yoke portions 110a and 110b use magnetic plates having the same time waveform of magnetostriction, and the rim portions 120a and 120b use magnetic plates having the same time waveform of magnetostriction, and the yoke portions 110a and 110b The time waveform of magnetostriction in the magnetic material plate to be used is made different from the time waveform of magnetostriction in the magnetic material plate used for the rim portions 120a and 120b. By using a magnetic plate having the same magnetostriction time waveform in one block, the yield of the magnetic plate and the productivity of the pile core can be improved.

  In the case of adopting the first method described in the section of (Method of differentiating the time waveform of magnetostriction), the magnetic material plate used for the yoke portions 110a and 110b is a magnetic domain control material (magnetic material plate subjected to magnetic domain fragmentation) The magnetic material plates used for the rim portions 120a and 120b can be plain materials (magnetic material plates not subjected to magnetic domain fragmentation). Conversely, the magnetic material plates used for the yoke portions 110a and 110b may be plain materials, and the magnetic material plates used for the rim portions 120a and 120b may be magnetic domain control materials.

  FIG. 4 is a view showing a first example of the laminated structure of the magnetic plate. In FIG. 4, the X-axis and Y-axis may be determined in any manner as long as they are two-dimensional orthogonal coordinates perpendicular to the Z-axis shown in FIG. Not shown. For example, when the magnetic plate A is a plain material and the magnetic plate B is a magnetic domain control material, the rim portions 120a and 120b are configured using only the magnetic plate A (see FIG. 5A), The yoke portions 110a and 110b are configured using the magnetic plate B (see FIG. 5B). In this way, it is possible to reduce the building factor (iron loss of electric equipment and iron loss of the magnetic plate) and simultaneously reduce the noise of the pile core. However, conversely to this, a magnetic material plate used for the yoke portions 110a and 110b may be a plain material, and a magnetic material plate used for the rim portions 120a and 120b may be a magnetic domain control material.

  The same applies to the yoke portions 210a and 210b and the rim portions 220a, 220b and 220c shown in FIG. 2 (for example, the yoke portions 210a and 210b have the configuration shown in FIG. 5B). The components 220b and 220c can be configured as shown in FIG. 5 (a) (the configuration may be reversed as described above).

When at least two types of magnetic plates having different magnetostriction time waveforms are used in one block, the blocks can be configured by periodically stacking the at least two types of magnetic plates. FIG. 4 is a view showing a second example of the laminated structure of the magnetic plate. Also in FIG. 4, the X axis and the Y axis are not shown for the same reason as in FIG. 5.
In the example shown in FIG. 5, three types of magnetic plates A, B, and C having different magnetostriction time waveforms one by one in this order (when viewed from the top of FIG. 5, A → B → C → A → It shows how to stack in the order of B → C → A → ...). If at least two types of magnetic plates are periodically stacked, it is not always necessary to stack magnetic plates having different magnetostriction time waveforms one by one. For example, three types of magnetic material plates having different magnetostriction time waveforms may be stacked in the order of A → B → B → C → C → C → C → A → B → B → C → C → C → A → ... . Also, at least two types of magnetic plates may be stacked at random. How to stack can be determined by the balance between the effect of reducing the vibration of the pile core and the yield of the magnetic plate and the productivity of the pile core.

Alternatively, magnetic plates having different magnetostriction time waveforms may be used for the surface layer portion and the inner layer portion of the block. The surface layer portion is a portion relatively located on the surface side, and is two portions located in the area at both ends in the stacking direction of the magnetic material plates in the block. An inner layer part is a part located between these two parts (surface part). FIG. 6 is a view showing a third example of the laminated structure of the magnetic plate. Also in FIG. 6, the X axis and the Y axis are not shown for the same reason as in FIG.
In FIG. 6, for example, magnetic layers with the same time waveform of magnetostriction are used for the surface layers 610 and 630, and magnetic layers with the same time waveform of magnetostriction are used for the inner layer 620; The time waveform of the magnetostriction of the magnetic material plate to be used is made different from the time waveform of the magnetostriction of the magnetic material plate used for the inner layer portion 620. The time waveform of magnetostriction of the magnetic material plate used for the surface layer portion 610 may be different from the time waveform of magnetostriction of the magnetic material plate used for the surface layer portion 630.

In the case of adopting the first method described in the section of (Method of differentiating the time waveform of magnetostriction), the magnetic material plate used for the surface layer portion 610, 630 is a magnetic domain control material (magnetic material plate subjected to magnetic domain fragmentation). The magnetic material plate used for the inner layer portion 620 can be a plain material (magnetic material plate not subjected to magnetic domain fragmentation). On the contrary, the magnetic plates used for the surface layer portions 610 and 630 are plain materials (magnetic plates not subjected to magnetic domain fragmentation), and the magnetic plates used for the inner layer 620 are magnetic domain control materials (magnetic domain fragmentation It may be a magnetic plate).
In addition, some or all of the respective application examples described in this field (field of (part to be applied)) may be combined. However, it goes without saying that it is impossible to realize a combination that causes a contradiction. For example, it is not possible to use magnetic plates having different magnetostriction time waveforms for blocks using magnetic plates having the same magnetostriction time waveform.

(Summary)
As described above, in the present embodiment, a laminated iron core is configured using at least two types of magnetic material plates having different magnetostrictive time waveforms. Therefore, development of a material that achieves low magnetostriction simply by combining at least two types of magnetic material plates having different magnetostriction time waveforms, and realization of low magnetostriction that can not be achieved by low magnetic strain alone with a single magnetic material plate Can. Therefore, it is possible to easily realize the reduction of the noise generated from the piled iron core. For example, only a grain-oriented electrical steel sheet not subjected to magnetic domain fragmentation can be formed by constructing a core with both a grain-oriented electrical steel sheet not subjected to magnetic domain fragmentation and a grain-oriented electrical steel sheet subjected to magnetic domain fragmentation. The noise generated from the piled iron core can be reduced more than the piled iron core constructed using only the piled iron core formed using the magnetic core and the directional magnetic steel sheet subjected to magnetic domain refinement.

  The embodiments of the present invention described above are merely examples of implementation for carrying out the present invention, and the technical scope of the present invention should not be interpreted limitedly by these. It is a thing. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  110a to 110b, 210a to 210b: yoke portions, 120a to 120b, 220a to 220c: rim portions, 310: time waveform of magnetic flux density, 320a to 320c: time waveform of magnetostriction, 610, 630: surface layer portion, 620: inner layer portion

Claims (13)

A stacked core constructed by stacking a plurality of magnetic plates, wherein
The plurality of magnetic plates includes at least two types of magnetic plates different in time waveform of magnetostriction when the stacked core is excited.   The magnetic plates according to claim 1, wherein the plurality of magnetic plates include at least two types of magnetic plates having different phases when the absolute value of the magnetostriction is maximum in the time waveform of the magnetostriction. Pile core.   The plurality of magnetic plates may include at least two types of magnetic plates that differ in phase by 5 ° or more when the absolute value of the magnetostriction is maximum in the time waveform of the magnetostriction. Pile core described in.   A period of a magnetostrictive time waveform obtained by combining the magnetostriction time waveforms of the at least two types of magnetic material plates with the largest area of the area in one period of the magnetostrictive time waveform of the at least two types of magnetic material plates The piled iron core according to any one of claims 1 to 3, wherein an area of the core is larger than that of the core.   One period of a magnetostrictive time waveform obtained by combining the magnetostrictive time waveforms of the at least two types of magnetic material plates with the smallest area of the area in one period of the magnetostrictive time waveform of the at least two types of magnetic material plates The piled iron core according to any one of claims 1 to 3, wherein an area of the core is larger than that of the core.   The at least two types of magnetic plates different in time waveform of the magnetostriction from one another include a directional electromagnetic steel sheet subjected to magnetic domain fragmentation and a directional electromagnetic steel sheet not subjected to magnetic domain fragmentation. The pile core according to any one of claims 1 to 5. The stacked core is configured by combining a plurality of blocks each formed by stacking a plurality of magnetic plates,
The stacked configuration of at least one of the plurality of blocks is different from the stacked configuration of the other blocks,
The pile core according to any one of claims 1 to 6, wherein the laminated structure is determined using a stacking position of the magnetic material plates and a time waveform of magnetostriction. The plurality of magnetic plates constituting one of the blocks are magnetic plates having the same time waveform of the magnetostriction,
The pile iron core according to claim 7, wherein magnetic bodies having different time waveforms of the magnetostriction are used in at least two of the plurality of blocks. The plurality of blocks have a plurality of yoke portions and a plurality of legs.
The laminated configuration of the magnetic plates constituting the plurality of yoke portions is the same,
The laminated configuration of the magnetic material plates constituting the plurality of legs is the same,
The pile iron core according to claim 7 or 8, wherein a lamination structure of magnetic material boards which constitute the plurality of yoke parts differs from a lamination structure of magnetic material boards which constitute the plurality of legs.   Of the magnetic material plates constituting the plurality of yoke portions and the magnetic material plates constituting the plurality of leg portions, one of the magnetic material plates is a grain-oriented electrical steel sheet subjected to magnetic domain fragmentation, 10. The pile core according to claim 9, wherein the other magnetic plate is a grain-oriented electrical steel sheet in which magnetic domain fragmentation has not been performed. The layered configuration of the surface layer portion and the layered configuration of the inner layer portion in one of the blocks are different,
The surface layer portions are two portions located in regions at both ends in the stacking direction of the magnetic material plates in the block,
The pile core according to claim 7, wherein the inner layer portion is a portion located between the two portions.   Of the magnetic material plates constituting the surface layer portion and the magnetic material plates constituting the inner layer portion, one magnetic material plate is a directional electromagnetic steel sheet subjected to magnetic domain fragmentation, and the other magnetic material plate The stacked core according to claim 11, wherein the magnetic core is a grain-oriented electrical steel sheet in which magnetic domain fragmentation has not been performed.   The piled iron core according to claim 7, wherein at least one block of the plurality of blocks is configured by periodically stacking at least two types of magnetic plates having mutually different magnetostrictive time waveforms. .

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