JP7083985B2 - Vibration power generation element and its manufacturing method - Google Patents

Description

The present invention relates to a vibration power generation element that generates electric power from vibration, and more particularly to a vibration power generation element using a magnetostrictive material.

Conventionally, a vibration power generation element that generates electric power from vibration by utilizing the magnetostrictive effect of a magnetostrictive material has been proposed (see, for example, Patent Document 1). Here, the magnetostrictive effect is the reverse phenomenon of the magnetostrictive effect in which the shape is distorted by being magnetized, and is a phenomenon in which the shape is distorted and magnetized. A material that exerts a magnetostrictive effect and a magnetostrictive effect is called a magnetostrictive material.

In Patent Document 1, a magnetostrictive thin band made of a magnetostrictive material, a coil composed of a conductive wiring pattern around the magnetostrictive thin band, and an insulating layer interposed between the magnetostrictive thin band and the wiring pattern are provided. A magnetostrictive power generation thin film piece having a sheet structure having a thickness of 500 μm or less including a magnetostrictive thin band and an insulating layer is disclosed. By attaching such a magnetostrictive power generation thin film piece to a vibrating structure, the vibration is converted into electric power, and electric power can be taken out from the coil.

On the other hand, in recent years, Fe—Si—B-based amorphous alloys have been provided as a magnetostrictive material suitable for such vibration power generation and at low cost.

International Publication No. 2012/176475

However, the Fe—Si—B-based amorphous alloy is produced by a method of spraying molten metal onto a roll to quench it, and is produced only as a thin band, not as a bulk. Therefore, even if the Fe—Si—B-based amorphous alloy is applied to the magnetostrictive power generation thin film piece of Patent Document 1, the cross-sectional area of the magnetostrictive thin band wound by the coil is not sufficient and the electromotive force is small. There's a problem. The electromotive force generated from the magnetostrictive band wound by the coil is proportional to the vibration frequency of the magnetostrictive band, the number of turns of the coil, the cross-sectional area of the magnetostrictive band through which the magnetic flux passes, and the rate of change in the magnetic flux density. Is.

Therefore, the present invention has been made in view of the above problems, and provides a vibration power generation element using an inexpensively available amorphous alloy as a magnetostrictive thin band, and has a larger electromotive force than the conventional vibration power generation element. The purpose is.

In order to achieve the above object, the vibration power generation element according to one embodiment of the present invention is a vibration power generation element that generates power from vibration, and has a plurality of film-like magnetostrictive strips made of an amorphous alloy magnetostrictive material. It includes a bonding agent for joining the plurality of magnetostrictive thin bands so as to be laminated, and a coil for bundling and winding the plurality of the joined magnetostrictive thin bands.

As a result, the vibration power generation element according to the present invention has a structure in which a plurality of magnetostrictive strips, which can be obtained at a low price but have a limited thickness, are laminated, so that the amount of the magnetic material is increased like a bulk, or When placed in a magnetic field, the cross-sectional area of the magnetostrictive thin band becomes large, and a larger electromotive force than before is generated.

Here, the amorphous alloy may be a Fe—Si—B based amorphous alloy.

As a result, a vibration power generation element using an inexpensive Fe—Si—B-based amorphous alloy as a magnetostrictive thin band is realized.

Further, the thickness of each of the plurality of magnetostrictive strips may be less than 100 μm.

As a result, the laminated structure in which a plurality of magnetostrictive thin bands are laminated has a very thin sheet structure as a whole, so that it is easily bent by vibration and can generate a large electromotive force.

Further, the coil may be a conducting wire coated with an insulating material.

This eliminates the need for the insulating layer included in the magnetostrictive power generation thin film piece of Patent Document 1, and simplifies the manufacturing method.

Further, the bonding agent may be an epoxy resin.

As a result, the plurality of magnetostrictive strips are firmly joined, and during vibration, tensile stress and compressive stress are reliably applied to each of the plurality of magnetostrictive strips from the vibrating structure.

Further, the vibration power generation element further includes a substrate that is attached and fixed to the plurality of magnetostrictive strips so as to be laminated, and the coil has the plurality of laminated magnetostrictive strips and the substrate. It may be wound so as to be bundled.

As a result, the substrate is fixed so as to be laminated on a plurality of magnetostrictive thin bands, so that the substrate can be easily attached to the vibrating structure. Further, since the coil may be wound so as to bundle the plurality of laminated magnetostrictive strips and the substrate, the coil can be easily wound and the production of the vibration power generation element can be made more efficient.

Further, the thickness of the substrate may be larger than the thickness of the plurality of magnetostrictive thin bands.

As a result, the thickness of the substrate is larger than the thickness of the laminated structure composed of a plurality of magnetic strain thin bands, so that the middle (center line) of the thickness of the vibration power generation element obtained by combining the laminated structure and the substrate is the laminated structure. It will be on the board, not on the board. Therefore, when the laminated structure and the substrate are overlapped and fixed to the vibrating structure, tensile stress is generated on one of the upper and lower layers of the vibrating laminated structure, and compressive stress is generated on the other side. The problem of offsetting is avoided.

Further, the vibration power generation element may further include a magnetic field generating unit that applies a magnetic field to the plurality of magnetostrictive thin bands.

As a result, a bias magnetic field is applied to the plurality of magnetostrictive thin bands, so that the magnetic flux passing through the plurality of magnetostrictive thin bands becomes large and a large electromotive force is generated.

Further, one end of the vibration power generation element may be fixed to the vibration structure so as to be a cantilever.

As a result, the vibration power generation element is fixed to the vibration structure at one end as a cantilever, so that the vibration from the vibration structure is expanded and transmitted to a plurality of magnetic strain thin bands, and the vibration is powered with high efficiency. A vibration power generation element that converts to is realized.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a vibration power generation element using an inexpensive available amorphous alloy as a magnetostrictive thin band, which has a larger electromotive force than the conventional one.

Therefore, according to the present invention, vibrations generated in automobiles, motors, viaducts, etc. can be converted into electric power, efficient use of energy is ensured, and the practical value of the present invention is extremely high.

External view of the vibration power generation element in the first embodiment External view of the vibration power generation element in the second embodiment External view of the vibration power generation element in the third embodiment The figure which shows the appearance that the vibration power generation element in Embodiment 3 was bent by vibration. External view of the vibration power generation element in the fourth embodiment

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, all of the embodiments described below show a specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, processes, order of processes, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

(Embodiment 1)
First, the vibration power generation element according to the first embodiment of the present invention will be described.

FIG. 1 is an external view of the vibration power generation element 10 according to the first embodiment. The vibration power generation element 10 is a plate-shaped element that generates electric power from vibration by utilizing the magnetostrictive effect, and has a plurality of film-like magnetostrictive strips 12a to 12e made of an amorphous alloy magnetostrictive material and a plurality of magnetostrictive bands. It is composed of bonding agents 13a to 13d for bonding the thin bands 12a to 12e so as to be laminated, and a coil 15 for bundling and winding a plurality of the bonded magnetostrictive thin bands 12a to 12e. The magnetostrictive thin bands 12a to 12e joined by the bonding agents 13a to 13d are collectively referred to as a laminated structure 14.

Each of the magnetic strain strips 12a to 12e is a Fe—Si—B based amorphous alloy, and has a thickness of, for example, Fe ₇₅ Si ₁₀ B ₁₅ , Fe _73.5 Si _13.5 B ₉ Nb ₃ Cu ₁ . Is a sheet-like thin band having a size of less than 100 μm. The sizes of the magnetostrictive strips 12a to 12e are, for example, 10 cm in length (X-axis direction), 5 mm in width (Y-axis direction), and 25 μm in thickness (Z-axis direction). In the present embodiment, the laminated structure 14 is composed of five layers of magnetostrictive thin bands 12a to 12e, but may be composed of two or more layers of magnetostrictive thin bands. The number of layers of the magnetostrictive strips constituting the laminated structure 14 may be appropriately determined according to the thickness of one magnetostrictive strip, the magnitude of the electromotive force to be generated, the installation environment, and the like.

The bonding agents 13a to 13d are members for laminating and firmly joining the magnetostrictive thin bands 12a to 12e, and are, for example, epoxy resins having a strong adhesive force.

The coil 15 is an example of a conducting wire that generates electric power by detecting a change in magnetic flux density that occurs in the magnetostrictive strips 12a to 12e, and is, for example, a copper wire (that is, an enamel wire) coated with an insulating material. The coil 15 is wound so as to bundle the magnetostrictive thin bands 12a to 12e, and the number of turns and the degree of lap winding are appropriately determined according to the required electromotive force. Both ends of the coil 15 are connected to a load that supplies the electromotive force obtained by the vibration power generation element 10 (for example, a power supply circuit that rectifies and converts it into a DC voltage). Further, the material of the coil 15 is not limited to the copper wire, and any conductor wire using gold, silver, a superconducting material or the like may be used.

The method for manufacturing the vibration power generation element 10 according to the present embodiment having the above structure is as follows. First, sheet-shaped magnetostrictive thin bands 12a to 12e having the same shape are prepared. Next, in the laminated structure of the magnetostrictive strips 12a to 12e, the bonding agents 13a to 13d are applied to the surfaces of the magnetostrictive strips 12a to 12e that come into contact with each other, and the magnetostrictive strips 12a to 12e are bonded to each other to form the laminated structure 14. make. Finally, the coil 15 is wound around the laminated structure 14. The vibration power generation element 10 thus completed is fixed or attached to a structure that generates vibration (that is, a vibration structure).

Although the vibration power generation element 10 is not always necessary, it is preferable to arrange the vibration power generation element 10 in a magnetic field (bias magnetic field) in order to generate a larger electromotive force. The device that generates a magnetic field may be any device that can apply a magnetic field to the vibration power generation element 10 (strictly speaking, magnetic strain thin bands 12a to 12e), for example, a permanent magnet installed near the vibration power generation element 10. Alternatively, it may be a vibration structure that generates a magnetic field such as a motor.

When the vibration power generation element 10 receives vibration, it generates power according to the following principle. That is, tensile stress and compressive stress are alternately applied to the vibration power generation element 10 from the vibrating structure, and the density of the magnetic flux passing through the magnetostrictive thin bands 12a to 12e changes in an alternating manner due to the magnetostrictive effect. At this time, a voltage (electromotive force) is generated in the coil 15 by the principle of electromagnetic induction.

As described above, the vibration power generation element 10 in the present embodiment is an element that generates electric power from vibration, and includes a plurality of film-like magnetostrictive strips 12a to 12e made of an amorphous alloy magnetostrictive material and a plurality of magnetostrictive bands. A bonding agent 13a to 13d for joining the thin bands 12a to 12e so as to be laminated, and a coil 15 for bundling and winding a plurality of the joined magnetostrictive thin bands 12a to 12e are provided. As a result, the vibration power generation element according to the present invention has a structure in which a plurality of magnetostrictive strips, which can be obtained at a low price but have a limited thickness, are laminated, so that the amount of the magnetic material is increased like a bulk, or When placed in a magnetic field, the cross-sectional area of the magnetostrictive thin band becomes large, and a larger electromotive force than before is generated.

The amorphous alloy is a Fe—Si—B based amorphous alloy. As a result, a vibration power generation element using an inexpensive Fe—Si—B-based amorphous alloy as a magnetostrictive thin band is realized.

Further, the thickness of each of the plurality of magnetostrictive thin bands 12a to 12e is less than 100 μm. As a result, the laminated structure 14 in which the plurality of magnetostrictive thin bands 12a to 12e are laminated has a very thin sheet structure as a whole, so that it is easily bent by vibration and can generate a large electromotive force.

Further, the coil 15 is a conducting wire coated with an insulating material. This eliminates the need for the insulating layer included in the magnetostrictive power generation thin film piece of Patent Document 1, and simplifies the manufacturing method.

Further, the bonding agents 13a to 13d are epoxy resins. As a result, the plurality of magnetostrictive thin bands 12a to 12e are firmly joined, and at the time of vibration, tensile stress and compressive stress are surely applied to each of the magnetostrictive thin bands 12a to 12e from the vibrating structure.

(Embodiment 2)
Next, the vibration power generation element according to the second embodiment of the present invention will be described.

FIG. 2 is an external view of the vibration power generation element 10a according to the second embodiment. The vibration power generation element 10a includes, in addition to the vibration power generation element 10 of the first embodiment, a substrate 30 that is attached and fixed so as to be laminated on a laminated structure 14 (a plurality of magnetostrictive thin bands 12a to 12e). Has been done. In this figure, as a cantilever, one end of the vibration power generation element 10a is fixed to an anchor 40, which is an example of a vibration structure, by a bolt 42. Hereinafter, the same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be described.

The substrate 30 is joined to the surface of the laminated structure 14 (here, the lower surface of the magnetic strain thin band 12a of the lowermost layer) with a bonding agent such as epoxy resin, and one end is fixed to the vibrating structure as a cantilever and vibrates. It is a metal member that transmits vibrations from the structure to the laminated structure 14. Here, the substrate 30 is fixed to the anchor 40 by a bolt 42 penetrating one end of the substrate 30.

The coil is wound so as to bundle the laminated structure 14 and the substrate 30.

According to the vibration power generation element 10a in the present embodiment having such a structure, it becomes easy to attach the substrate 30 to the vibration power generation structure. Further, in the manufacturing, the coil may be wound so as to bundle the laminated structure 14 and the substrate 30, so that the coil can be easily wound and the production of the vibration power generation element 10a is made efficient.

Further, by fixing the substrate 30 as a cantilever and one end thereof to the vibrating structure, the vibration from the vibrating structure is expanded by the substrate 30 and transmitted to the magnetic strain thin bands 12a to 12e, and the vibration is performed with high efficiency. A vibration power generation element that converts the power into electric power is realized. That is, in the form shown in FIG. 2, when the free end of the substrate 30 bends upward (in the positive direction of the Z axis), compressive stress is applied to all of the magnetostrictive thin bands 12a to 12e, while the substrate 30. When the free end of is bent downward (negative direction of the Z axis), tensile stress is applied to all of the magnetostrictive strips 12a to 12e, causing a large strain in the vibration power generation element 10a to efficiently generate power. ..

In this embodiment, the size and thickness of the substrate 30 may be arbitrary. However, it is preferable that the width of the substrate 30 is substantially the same as the width of the magnetostrictive thin bands 12a to 12e so that the substrate 30 and the laminated structure 14 can be bundled and easily wound by the coil 15. Further, the length of the substrate 30 is preferably larger than the length of the magnetostrictive thin bands 12a to 12e so that the substrate 30 can be easily attached to the vibrating structure. Further, the thickness of the substrate 30 is preferably a thickness that easily vibrates as a cantilever.

Further, in the present embodiment, the vibration power generation element 10a is fixed to the vibration structure by one bolt 42, but it may be fixed to the vibration structure by a plurality of bolts, and a method different from that of the bolt ( It may be fixed to the vibrating structure by welding, crimping, etc.).

(Embodiment 3)
Next, the vibration power generation element according to the third embodiment of the present invention will be described.

FIG. 3 is an external view of the vibration power generation element 10b according to the third embodiment. The size and thickness of the substrate 30a of the vibration power generation element 10b are different from those of the vibration power generation element 10a of the second embodiment. Hereinafter, the same components as those in the second embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the second embodiment will be described.

Similar to the substrate 30 of the second embodiment, the substrate 30a is joined to the surface of the laminated structure 14 (here, the lower surface of the magnetic strain thin band 12a of the lowermost layer) with a bonding agent such as epoxy resin, and serves as a cantilever. , One end is fixed to the vibrating structure, and it is a metal member that transmits the vibration from the vibrating structure to the laminated structure 14.

However, in the substrate 30a of the present embodiment, as shown in FIG. 3, the length of the substrate 30a is about the same as the length of the laminated structure 14. Then, one end of the vibration power generation element 10b is fixed to the anchor 40 by a bolt 42 penetrating both the substrate 30 and the laminated structure 14 so that the entire vibration power generation element 10b becomes a cantilever.

Further, in the present embodiment, the thickness of the substrate 30a is larger than the thickness of the laminated structure 14. That is, the middle of the thickness of the vibration power generation element 10b in which the substrate 30a and the laminated structure 14 are combined exists not in the laminated structure 14 but in the substrate 30. In this embodiment, unlike the second embodiment, the substrate 30 and the laminated structure 14 are integrally fixed to the vibrating structure, so that the upper layer of the laminated structure 14 and the laminated structure 14 and the laminated structure 14 are fixed at the time of vibration. This is to avoid the problem of canceling the electromotive force due to the tensile stress generated on one side of the lower layer and the compressive stress generated on the other side.

That is, if one end of the laminated structure around which the coil is wound is fixed as a cantilever without the substrate 30a, tensile stress is applied to one of the upper and lower layers of the laminated structure during vibration. On the other hand, compressive stress is generated, so that the electromotive forces cancel each other out. According to the present embodiment, since the stress neutral line deviates from the laminated structure 14, such offsetting of electromotive force is avoided.

FIG. 4 is a diagram showing a state in which the vibration power generation element 10b in the present embodiment is bent by vibration. Here, a cross-sectional view when the vibration power generation element 10b is cut on the surface including the IV-IV line in FIG. 3 is shown. Further, a line (center line 32) passing through the middle of the thickness of the vibration power generation element 10b in which the substrate 30a and the laminated structure 14 are combined is also shown.

As shown in this figure, in the vibration power generation element 10b of the present embodiment, the thickness of the substrate 30a is larger than that of the laminated structure 14, so that the center line 32, which is the neutral line of stress, passes through the substrate 30a. As a result, when the vibration power generation element 10b vibrates as a cantilever, tensile stress or compressive stress is applied to all of the magnetostrictive strips 12a to 12e constituting the laminated structure 14, and all of the magnetostrictive strips 12a to 12e are subjected to tensile stress or compressive stress. The same stress is applied and the electromotive force is surely generated.

(Embodiment 4)
Next, the vibration power generation element according to the fourth embodiment of the present invention will be described.

FIG. 5 is an external view of the vibration power generation element 10c according to the fourth embodiment. The vibration power generation element 10c is a magnetic field generating portion (connecting yokes 20a and 20b, permanent magnets 22a and 22b, and a back yoke 24) that apply a magnetic field to the laminated structure 14 to the vibration power generation element 10a of the second embodiment. It has a structure with the addition of a structure consisting of). Hereinafter, the same components as those in the second embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the second embodiment will be described.

The connecting yokes 20a and 20b, the permanent magnets 22a and 22b, and the back yoke 24 are structures that apply a bias magnetic field to the magnetostrictive thin bands 12a to 12e. That is, the connecting yokes 20a and 20b are made of a magnetic material containing Fe, and are bonded to one end surface and the other end surface of the laminated structure 14 with epoxy resin or the like, respectively. The permanent magnets 22a and 22b are permanent magnets in which the S pole and the N pole are bonded to the connecting yokes 20a and 20b with an epoxy resin or the like, respectively. The back yoke 24 is made of a magnetic material containing Fe, and is bonded to the N pole of the permanent magnet 22a and the S pole of the permanent magnet 22b with an epoxy resin or the like.

Such connecting yokes 20a and 20b, permanent magnets 22a and 22b, and the back yoke 24 are magnetic field generating portions that apply a bias magnetic field to the laminated structure 14 (more strictly, the magnetostrictive thin bands 12a to 12e). Functions as. That is, a magnetic loop through which the magnetic flux passes is formed by the permanent magnet 22a, the back yoke 24, the permanent magnet 22b, and the magnetostrictive thin bands 12a to 12e, and the laminated structure 14 (more strictly, the magnetostrictive thin bands 12a to 12e) is always formed. A constant magnetic field (bias magnetic field) is applied to the magnet.

According to the vibration power generation element 10c in the present embodiment having such a structure, a bias magnetic field is applied to the magnetostrictive thin bands 12a to 12e by the magnetic field generating portion, so that when the vibration power generation element 10c is subjected to vibration. In addition, the magnetic flux passing through the magnetostrictive thin bands 12a to 12e changes significantly, and a large electromotive force is generated.

In the present embodiment, the magnetic field generation unit is added to the vibration power generation element 10a of the second embodiment, but the magnetic field generation unit may be added to the vibration power generation element 10 of the first embodiment.

Although the vibration power generation element of the present invention has been described above based on the first to fourth embodiments, the present invention is not limited to these embodiments. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the embodiment, and other embodiments constructed by combining some components in the embodiment are also within the scope of the present invention. include.

For example, in the above embodiment, the vibration power generation element is installed as a cantilever, but it is not limited to such an installation example, and is fixed by being attached to a vibration structure or tightened with a screw or the like. You may.

The present invention can be used as a vibration power generation element that generates electric power from vibration using a magnetic strain material, for example, as a vibration power generation element that converts vibration generated in an automobile, a motor, a high bridge, or the like into electric power.

10, 10a, 10b, 10c Vibration power generation element 12a to 12e Magnetostrictive strip 13a to 13d Joining agent 14 Laminated structure 15 Coil 20a, 20b Coupling yoke 22a, 22b Permanent magnet 24 Back yoke 30, 30a Substrate 40 Anchor 42 Bolt

Claims (10)

It is a vibration power generation element that generates electric power from vibration.
Multiple film-like magnetostrictive strips made of amorphous alloy magnetostrictive material,
A bonding agent that joins the plurality of magnetostrictive thin bands so as to be laminated,
A substrate that is attached and fixed to the plurality of magnetostrictive strips joined by the bonding agent so as to be laminated and fixed to a vibrating structure .
A vibration power generation element comprising the plurality of laminated magnetostrictive strips and a coil wound so as to bundle the substrate. The vibration power generation element according to claim 1, wherein the amorphous alloy is a Fe—Si—B-based amorphous alloy. The vibration power generation element according to claim 1 or 2, wherein the thickness of each of the plurality of magnetostrictive strips is less than 100 μm. The vibration power generation element according to any one of claims 1 to 3, wherein the coil is a conducting wire coated with an insulating material. The vibration power generation element according to any one of claims 1 to 4, wherein the bonding agent is an epoxy resin. The vibration power generation element according to any one of claims 1 to 5, wherein the thickness of the substrate is larger than the thickness of the laminated structure composed of the plurality of magnetostrictive strips bonded by the bonding agent . The vibration power generation element according to any one of claims 1 to 6, further comprising a magnetic field generating unit that applies a magnetic field to the plurality of magnetostrictive thin bands. The vibration power generation element according to any one of claims 1 to 7, wherein one end of the vibration power generation element is fixed to the vibration structure via the substrate so as to be a cantilever. Any of claims 1 to 8, wherein the coil is wound around one pair of sides of the two pairs forming the peripheral edge of each of the plurality of magnetostrictive strips, and the other pair of sides is open. The vibration power generation element according to item 1. It is a manufacturing method of a vibration power generation element that generates electric power from vibration.
Prepare multiple film-like magnetostrictive strips made of amorphous alloy magnetostrictive material,
A bonding agent is applied to the surfaces of the plurality of magnetostrictive strips that come into contact with each other in the prepared laminated structure of the plurality of magnetostrictive strips.
By laminating the plurality of magnetostrictive strips coated with the bonding agent, a laminated structure is created.
A substrate to be fixed to the vibrating structure is attached and fixed so as to be laminated on the laminated structure.
A method for manufacturing a vibration power generation element in which a coil is wound so as to bundle the laminated structure and the substrate.

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