JP2022170023A - electrical equipment - Google Patents

Abstract

To provide electrical equipment capable of driving a load portion by performing self-power generation for converting vibration, displacement, etc. from external force into electric power with a simpler structure than before.SOLUTION: Electrical equipment 100A disclosed herein includes an electromagnetic induction coil 12, an elastic body 20 that contains magnetized magnetic powder 22, generates a magnetic field that penetrates the electromagnetic induction coil 12, and changes the magnetic flux density of the magnetic field when elastically deformed by receiving an external force, a rectification unit 91 that rectifies an induced current induced in the electromagnetic induction coil 12 due to a change in the magnetic flux density, and a load unit 92 that receives power from the rectification unit 91 and operates.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to self-powered electrical appliances.

2. Description of the Related Art As a conventional electrical device of this type, there is known a rotating machine that is driven to rotate by an external force and that generates power by itself (see, for example, Patent Document 1).

National Publication No. 2012-515860 (Fig. 4, claim 11)

However, the above-mentioned conventional electrical equipment has a complicated structure because it has a rotating machine, which may cause a failure. Therefore, the present disclosure provides an electrical device that has a simpler structure than conventional devices and that can drive a load section by performing self-power generation that converts vibration, displacement, etc. from an external force into electric power.

One aspect of the present invention, which has been made to solve the above problems, contains an electromagnetic induction coil and magnetized magnetic powder, generates a magnetic field penetrating the electromagnetic induction coil, and elastically deforms under external force. An elastic body in which the magnetic flux density of the magnetic field changes, a rectifying section that rectifies the induced current induced in the electromagnetic induction coil due to the change in the magnetic flux density, and a load section that receives power from the rectifying section and operates. electrical equipment.

An electrical device of this aspect has an elastic body that contains magnetized magnetic powder and generates a magnetic field penetrating an electromagnetic induction coil. When such an elastic body receives an external force and elastically deforms, the magnetic flux density of the magnetic field penetrating the electromagnetic induction coil changes, and self-power generation is performed by electromagnetic induction. Then, the induced current flowing through the electromagnetic induction coil is rectified and applied to the load section to drive the load section. As described above, the electric device of one embodiment of the present invention can generate power by itself using an elastic body having a simpler structure than a rotating machine included in a conventional electric device.

A circuit diagram of an electrical device according to a first embodiment of the present disclosure Perspective view of electrical equipment Side sectional view of electrical equipment Conceptual diagram of power generation unit (A) Conceptual diagram showing magnetic powder in a magnetic elastic body, (B) Conceptual diagram of a compressed magnetic elastic body Flowchart showing a method for manufacturing a magnetoelastic body (A) Conceptual diagram showing the magnetization of the magnetoelastic body before compressive deformation, (B) Conceptual diagram showing the magnetization and induced current of the magnetoelastic body when compressively deformed. (A) Conceptual diagram showing the magnetic field of the magnetoelastic body before compression deformation and magnetization of the magnetoelastic body, (B) Conceptual diagram showing the induced magnetic field and induced current generated in the coil and the circuit when the magnetoelastic body is compressed. (A) Conceptual diagram showing the magnetic field and magnetization of the magnetoelastic body before compression deformation, (B) showing the induced magnetic field and induced current generated in the two coils and the circuit when the magnetoelastic body is compressed. Conceptual diagram Circuit diagram of electrical equipment according to the second embodiment (A) Conceptual diagram of the electrical device of the third embodiment, (B) Partially broken side view of the electrical device attached to the suspension Conceptual diagram of the electrical equipment of the fourth embodiment Side sectional view of the floor structure including the electrical equipment of the fifth embodiment The perspective view of the electric equipment of 6th Embodiment The perspective view of the electric equipment of 7th Embodiment (A) Side sectional view of the electric device of the eighth embodiment, (B) Side sectional view of the bent and deformed electric device The perspective view of the electric equipment of 9th Embodiment Conceptual diagram of test equipment Table showing the details and characteristics of the magnetoelastic body of each experimental example

[First embodiment]
An electric device 100A according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 9. FIG. As shown in FIG. 1, an electric device 100A of the present embodiment has a power generation section 10, a rectification section 91, and a load section 92. As shown in FIG.

The load section 92 includes, for example, a radio module 92A. The wireless module 92A is, for example, a modified version of an RFID, in which the RFID tag wirelessly receives electric power, modulates the identification number to a short-range wireless communication carrier each time the electric power is received, and wirelessly transmits the identification number. At a certain point, the wireless module 92A receives power by wire from the power generation unit 10 through the rectification unit 91, and each time the power is received, the identification number is modulated into a predetermined carrier wave for wireless communication and transmitted. . Examples of the predetermined wireless communication include long-distance wireless communication, Wi-Fi, infrared communication, short-range wireless communication, and the like.

The radio module 92A may modulate information other than the identification number into a carrier wave and transmit it by radio. Alternatively, the radio module 92A may transmit only a radio wave of a specific frequency that does not contain information without modulating the information into a carrier wave. However, the transmission of the radio wave itself may be information from the electric device 100A.

The rectifying section 91 is, for example, a known voltage doubler rectifying circuit, the input side of which is connected to the electromagnetic induction coil 12 of the power generation section 10, and the output side of which is connected to the aforementioned wireless module 92A. The induced current induced in the electromagnetic induction coil 12 is rectified by the rectifier 91 and applied to the wireless module 92A.

Although a triple voltage rectifier circuit is exemplified in the rectifier unit 91 shown in FIG. A circuit is illustrated.

The power generation unit 10 includes an electromagnetic induction coil 12, an elastic body 20 disposed inside thereof, and an expansion case 30 that accommodates them. As shown in FIGS. 2 and 3, the extensible case 30 includes a cylindrical body 31 with one end closed and the other open end, and a closed end open end cylindrical body 31 with a larger outer diameter than the cylindrical body 31. , and the cylindrical body 32 are fitted to each other with their open ends facing each other. Further, the axial lengths of both cylinders 31 and 32 are substantially the same, and the open ends of both cylinders 31 and 32 are provided with return portions 31A and 32A that engage with each other to prevent detachment. Then, the telescopic case 30 changes between the longest state in which the return portions 31A and 32A are engaged with each other and the shortest state in which the open end of one cylinder 31 contacts the bottom of the other cylinder 32 . The shortest stretchable case 30 has an axial length that is, for example, approximately 1/2 that of the longest stretchable case 30 .

A circuit case 33 accommodating the rectifying section 91 and the load section 92 is fixed to the outer surface of the cylindrical body 31 . A plurality of projecting pieces 31B projecting sideways from a plurality of positions in the circumferential direction are provided at the bottom wall side end of one cylinder 31, and mounting holes 31C are formed in each of the projecting pieces 31B. . For example, an adjust mechanism 35 is provided at the tip of the other cylinder 32 . The adjusting mechanism 35 includes a support cylinder 35A projecting from the center of the outer surface of the bottom wall of the cylindrical body 32 and having a female screw portion 35B on the inner surface, and a shaft portion 35D having a male screw portion 35C on the outer surface to be screwed into the female screw portion 35B. and a contact plate 35E rotatably attached to the tip of the shaft portion 35D.

The expandable case 30 of the present embodiment is made of a non-magnetic material such as resin or stainless steel, but the expandable case 30 and the spacer 34 described later are made of a magnetic material such as iron so as to expand and contract together with the elastic body 20 described later. The case 30 may form a magnetic path. Further, the cylinders 31 and 32 of this embodiment are connected to each other through an elastic body 20 which will be described later so as to be non-rotatably connected. In addition, a protrusion that engages with the engagement groove may be provided on the other side to restrict relative rotation between the cylinders 31 and 32 .

As shown in FIG. 3, the electromagnetic induction coil 12 has a cylindrical shape with an outer diameter and an axial length that can be just accommodated inside one of the cylinders 31, for example, and is fixed inside the cylinder 31. As shown in FIG. A pair of lead wires 12A of the electromagnetic induction coil 12 are led out to the side of the cylinder 31 through a through hole 31D passing through a side wall of the cylinder 31 near the bottom wall. The pair of lead wires 12A are taken into the circuit case 33 and connected to the rectifying section 91. As shown in FIG. The pair of lead wires 12A bends as the expandable case 30 expands and contracts. A notch 32B (see FIG. 2) is formed at the end of the cylindrical body 32 on the opening side to avoid interference with the pair of lead wires 12A.

The elastic body 20 has a columnar shape fitted inside the electromagnetic induction coil 12 with a gap, is arranged on the coaxial axis of the extensible case 30, and has both end surfaces attached to the bottom surfaces of the cylindrical bodies 31 and 32, for example. Fixed with adhesive. A columnar spacer 34 having the same outer diameter as that of the elastic body 20 is arranged between one end surface of the elastic body 20 and the bottom surface of the cylindrical body 32 as necessary to adjust the compressibility of the elastic body 20 . be. Specifically, when the spacer 34 is not provided, the elastic body 20 inside the extensible case 30 is compressed to 1/2 as the extensible case 30 is when the extensible case 30 changes from the longest state to the shortest state. be. On the other hand, if the spacer 34 is provided, the compression rate of the elastic body 20 can be increased to an arbitrary compression rate of 1/2 or more. Note that FIG. 3 illustrates a structure in which the elastic body 20 provided with the spacer 34 is compressed to 1/3.

The elastic body 20 is slightly compressed between the bottom surfaces of the cylinders 31 and 32 when the extensible case 30 is in its longest state. As a result, looseness between the cylinders 31 and 32 is prevented when the extensible case 30 is not subjected to external force.

In addition, although the elastic body 20 is fixed to the cylindrical bodies 31 and 32 with an adhesive, it does not have to be fixed. Further, the bottom surfaces of the cylinders 31 and 32 and the both end surfaces of the elastic body 20 may be provided with projections and depressions for centering the elastic body 20 with respect to the extensible case 30 by engaging the projections and depressions with each other.

The elastic body 20 is, for example, a foamed elastomer, and magnetized magnetic powder 22 is dispersed therein. That is, the elastic body 20 is a so-called "magnetic elastic body". In the following description, in order to clearly distinguish between the elastic body 20 and the elastic body 20 containing the magnetic powder 22, and the elastic body 20 containing the magnetic powder 22 and the elastic body 20, the magnetic powder 22 is mixed with the elastic body 20. , the entire "elastic body 20" including the elastic body and the magnetic powder 22 is called the "magnetic elastic body 20", and the single elastic body is called the foamed elastomer 21 because it is a foamed elastomer. Make a clear distinction.

The foamed elastomer 21 is a polyurethane elastomer foam and has an open-cell structure or a semi-open-cell structure. The foaming ratio of the foamed elastomer 21 is 1.4 to 6 times. The foamed elastomer 21 may be a rubber foam, a thermoplastic resin foam such as a polyolefin resin, or the like. The foamed elastomer 21 preferably has an open-cell structure or a semi-open-cell structure as a whole from the viewpoint of moldability and elastic deformation easiness, but only a part of the foamed elastomer 21 has an open-cell structure or a semi-open-cell structure. may Moreover, the foamed elastomer 21 can suppress shrinkage (so-called shrinkage) of the foamed elastomer 21 after molding by having an open-cell structure at least partially. Furthermore, the foaming ratio of the foamed elastomer 21 of the present embodiment is 1.4 to 6 times as described above, more preferably 1.7 to 5 times, and more preferably 2 to 4 times. preferable. Here, when the expansion ratio of the foamed elastomer 21 is 1.4 times or more, particularly good cushioning properties are obtained, and when the expansion ratio is 6 times or less, particularly good moldability and durability are obtained. Further, the expansion ratio does not indicate the expansion ratio of the foamed elastomer 21 containing the magnetic powder 22, but the expansion ratio of the foamed elastomer 21 alone.

The magnetic powder 22 is neodymium-based magnetic powder, and the particle diameter of the magnetic powder 22 is 3 to 200 μm. The magnetic powder 22 is preferably composed of neodymium-based magnetic powder having a strong magnetic force when formed into a permanent magnet. , alnico-based magnetic powder, ferrite-based magnetic powder, and other known hard magnetic materials. The shape of the particles 23 of the magnetic powder 22 is not limited, but specific examples thereof include scale-like, spherical, needle-like, and the like. Furthermore, the particle size of the magnetic powder 22 of the present embodiment is, as described above, 3 to 200 μm, and more preferably 5 to 100 μm. By increasing the particle diameter of the magnetic powder 22, the surface magnetic flux density of the magnetic elastic body 20 can be increased. When the magnetic powder 22 is formed by subjecting the magnetic particles to a surface treatment, the ratio of the magnetic component in the magnetic powder 22 can be increased by increasing the particle diameter of the magnetic powder 22. It becomes possible to further increase the surface magnetic flux density of the body 20 . Also, the particle size of the magnetic powder 22 is preferably 200 μm or less from the viewpoint of moldability and deformation easiness of the magnetic elastic body 20 . Further, when the particle size of the magnetic powder 22 is 200 μm or less, the moldability is particularly good, and the falling off of the magnetic powder 22 from the foamed elastomer 21 can be further prevented. Furthermore, when the particle size of the magnetic powder 22 is less than 3 μm, the workability deteriorates, so the particle size of the magnetic powder 22 is preferably 3 μm or more. The particle size is measured by a sieving test according to JIS Z 8815:1994.

In the magnetic elastic body 20 of the present embodiment, the mass concentration (mass ratio) of the magnetic powder 22 to the foamed elastomer 21 is 40 to 80%, and the volume concentration (volume ratio) of the magnetic powder 22 to the foamed elastomer 21 is It is 1.0 to 3.5%. This makes it possible to increase the change in the magnetic flux density of the magnetic elastic body 20 while facilitating elastic deformation of the magnetic elastic body 20 . In addition, the magnetic elastic body 20 preferably has a compression set of 30% or less according to JIS K 6262:2013 A method. Further, the magnetic elastic body 20 preferably has a repeated compression strain of 20% or less when 50% compression is repeated 100,000 times at 1 Hz. According to these configurations, the foamed elastomer 21 is well restored after being elastically deformed. As a result, even when the magnetic elastic body 20 is used in an application where the magnetic elastic body 20 is repeatedly compressed and used, the permanent set of the foamed elastomer 21 is reduced, and the magnetic elastic body 20 is more suitable for repeated use.

As shown in FIG. 5, the magnetic moment of each particle 23 of the magnetic powder 22 in the foamed elastomer 21 (more specifically, the synthetic magnetic moment in the particle 23) is in the axial direction of the cylindrical magnetic elastic body 20. As a result, as shown in FIG. 4, one end of the magnetic elastic body 20 in the axial direction is the N pole and the other end is the S pole. Specifically, some of the particles 23 of the magnetic powder 22 may include particles whose magnetic moment direction intersects the axial direction of the magnetic elastic body 20, but the magnetic moment of the particles 23 of the magnetic powder 22 is The direction of the combined magnetic moment is the axial direction of the magnetic elastic body 20 . In FIG. 5A and FIG. 5B, which will be described later, the magnetization directions of the particles 23 of the magnetic powder 22 are schematically indicated by arrows.

The description about the structure of the electric equipment 100A is above. 100 A of this electric equipment are manufactured with the following method. That is, to manufacture the magnetic elastic body 20 as shown in FIG. 6, first, a first liquid is prepared by mixing polyol and isocyanate to form a prepolymer. Here, the first liquid is a prepolymer having an isocyanate group (NCO) at its end. After that, the magnetic powder 22 is mixed with the first liquid and dispersed uniformly (S11). Also, a second liquid containing a catalyst, a foaming agent, etc. is prepared (S11). After that, the first liquid and the second liquid are mixed to obtain a mixed liquid (S12). Here, the NCO% of the prepolymer having an isocyanate group at its terminal is preferably 3 to 7%, and in this embodiment, it is 6%. Thereby, it becomes possible to obtain the magnetic elastic body 20 excellent in moldability and durability.

Next, the mixed solution is injected into a mold whose temperature has been adjusted in advance, and is foamed and hardened to form, for example, a columnar foamed molded body (S13). Magnetic powder 22 is dispersed in a foamed elastomer 21 in this foamed molding. Further, in the foam molded body, the magnetic moment of each particle 23 of the magnetic powder 22 is oriented in random directions. In addition, in the step of foaming and curing the mixed solution in the molding die, after curing (primary curing) is performed for a predetermined time while the mold is closed, the resulting foamed molding is taken out from the molding die. Primary curing is performed, for example, at 60-120° C. for 10-120 minutes. The foam molded article that has been subjected to primary curing and removed from the mold is preferably further subjected to secondary curing. The secondary curing is performed at 90 to 180° C. for 8 to 24 hours, for example. In this embodiment, the elastic member in which the magnetic powder 22 is dispersed is made of polyurethane elastomer. It can be hardened. This makes it easier to uniformly disperse the magnetic powder 22 . Therefore, even the magnetic powder 22 having a particle diameter of 100 μm or more can be easily dispersed in the magnetic elastic body 20, and the magnetic flux density of the magnetic elastic body 20 can be increased.

In this embodiment, the magnetic powder 22 is mixed with the first liquid and then mixed with the second liquid. The magnetic powder 22 can be uniformly dispersed in the foamed elastomer 21 .

Next, the foam molded body is magnetized (S14). In this step, the magnetic moments of the particles 23 of the magnetic powder 22 in the foamed molding are aligned by applying an external magnetic field. In this embodiment, an external magnetic field is applied in the axial direction of the cylindrical foamed elastomer 21 . Here, the magnetization may be performed in a natural length state in which the foamed molded body is not deformed, or in a state in which the foamed molded body is compressed in the axial direction with respect to the natural length state (for example, a 50% compressed state in which it is compressed by 50%). may As described above, the magnetic elastic body 20 is obtained from the foam molded body.

Further, it is particularly preferable that the magnetic elastic body 20 has a magnetic flux density (surface magnetic flux density) that is 5% or more higher than that in the natural length state when the magnetic elastic body 20 is compressed 10% in the axial direction. Such a magnetic elastic body 20 can be obtained, for example, by magnetizing the magnetic powder 22 in the compression direction in a compressed state (for example, 50% compressed state) of the foamed elastomer 21 in which the magnetic powder 22 is dispersed. can be manufactured.

The magnetic elastic body 20 manufactured as described above is attached to the expandable case 30 as follows. That is, the cylinders 31 and 32 of the expansion case 30 are prepared in a separated state. The electromagnetic induction coil 12 is fixed to one of the cylinders 31 with the pair of lead wires 12A of the electromagnetic induction coil 12 pulled out from the through holes 31D. is placed and fixed to both bottom surfaces of cylinders 31 and 32 . At that time, the spacer 34 is fixed with an adhesive between one end surface of the magnetic elastic body 20 and the bottom surface of the cylindrical body 32 as necessary. Then, one cylinder 31 is deformed so as to narrow the open end and is pushed inside the other cylinder 32, and one cylinder 31 is elastically restored to return both cylinders 31 and 32. Portions 31A and 32A are engaged.

Next, the pair of lead wires 12A of the electromagnetic induction coil 12 are connected to the rectifying section 91, the rectifying section 91 is connected to the load section 92, and the rectifying section 91 and the load section 92 are housed in the circuit case 33. . Manufacture of 100 A of electric appliances is completed with the above.

The description about the manufacturing method of 100 A of electric equipments of this embodiment is above. Next, the effects of the electric device 100A will be described. As shown in FIG. 3, the electric device 100A is set in a gap between a pair of facing members 201 and 202 whose distance between them can be varied, and the deformation/operation of the pair of facing members 201 and 202 is performed. is used to detect For this purpose, the electric device 100A is arranged so that the axial direction of the expansion case 30 (which is also the axial direction of the electromagnetic induction coil 12 and the magnetic elastic body 20) faces the opposing direction of the pair of opposing members 201 and 202. be. Then, for example, when the distance between the pair of opposing members 201 and 202 is normal, the adjust mechanism 35 is adjusted so that the expansion case 30 is in a desired state. Specifically, when detecting both the case where the pair of opposed members 201 and 202 move away from the normal state and the case where they approach each other, the expansion/contraction case 30 is compressed to approximately 1/2 of the maximum length. The adjust mechanism 35 is adjusted so that If it is desired to detect only that the pair of opposed members 201 and 202 have approached each other from the normal state, the extensible case 30 is slightly compressed between the pair of opposed members 201 and 202 in the normal state. Alternatively, the adjusting mechanism 35 is adjusted so that the contact plate 35E of the adjusting mechanism 35 is slightly separated from the opposing member 202 on one side. In order to prevent the electric device 100A from laterally slipping from the pair of opposed members 201 and 202, bolts passed through the mounting holes 31C of the extensible case 30 are threaded into the screw holes of one of the magnetic elastic bodies 201 as necessary. It is preferable to fix the expandable case 30 to one of the magnetic elastic bodies 201 by tightening or the like.

As described above, with the electric device 100A set between the pair of opposing members 201 and 202, when the spacing between the pair of opposing members 201 and 202 changes, the magnetic elastic body 20 moves along with the expandable case 30 in the axial direction. is expanded and contracted by . Then, the density of the magnetic flux passing through the electromagnetic induction coil 12 among the magnetic flux of the magnetic field generated by the magnetic elastic body 20 changes, and an induced current I is generated. That is, the power generation unit 10 generates power.

The mechanism by which the power generation is performed is considered to be as follows. That is, in the axial direction of the electromagnetic induction coil 12, if the magnetic flux density in the magnetic elastic body 20 is Bz, the external magnetic field is Hz, the magnetization of the magnetic elastic body 20 is Mz, and the magnetic permeability of vacuum is μ0,
Bz=μ0·Hz+Mz (A)
It is known that there is a relationship between Regarding the magnetization Mz, mz is the average value of the magnetic moment of the particles 23 of the magnetic powder 22 in the axial direction of the electromagnetic induction coil 12, and the number of particles 23 of the magnetic powder 22 per unit volume of the magnetic elastic body 20 is Let n be
Mz=n·mz (B)
It is known that the relationship of

Here, since the magnetic elastic body 20 is made by mixing the magnetic powder 22 with the foamed elastomer 21, when it is compressed in the axial direction, the bubbles of the foamed elastomer 21 are crushed, and when it is stretched, the bubbles expand, and the size in the radial direction is increased. It expands and contracts in a state where the change in is suppressed. Then, when the magnetic elastic body 20 is compressed in the axial direction of the electromagnetic induction coil 12 (FIG. 5B), the distribution density of the particles 23 of the magnetic powder 22 in the magnetic elastic body 20 increases (that is, the relational expression ( It is thought that the magnetization Mz increases as the n in B) increases, and that the magnetization Mz decreases as the length increases.

In particular, when the magnetic elastic body 20 is magnetized in a compressed state in which the magnetic elastic body 20 is compressed with respect to the natural length state, when the magnetic elastic body 20 is compressed in the axial direction of the electromagnetic induction coil 12, the magnetic powder is more dense than in the natural length state. Since the directions of the magnetic moments of the particles 23 of the body 22 are aligned in the axial direction of the electromagnetic induction coil 12, it is considered that the average value mz of the magnetic moments increases.

In addition to the effect of the change in the distribution density of the magnetic powder 22 described above, the change in the magnetization Mz is considered to be further increased by the increase or decrease in the average value mz of the magnetic moment. Specifically, when the magnetic elastic body 20 is compressed, the amount of compression when the magnetic elastic body 20 is magnetized (i.e., the amount of compression at which the direction of the magnetic moment mz of the magnetic powder 22 is most aligned in the axial direction of the magnetic elastic body 20) It is considered that the magnetization Mz becomes particularly large when it reaches the vicinity of ). As the magnetization Mz increases, the magnetic flux density Bz in the magnetic elastic body 20 increases according to the above relational expression (A), so the magnetic flux penetrating the electromagnetic induction coil 12 increases. When the magnetoelastic body 20 expands, the opposite phenomenon occurs when it is compressed. Then, it is considered that an induced current I flows through the electromagnetic induction coil 12 so as to generate a magnetic field H' in a direction (downward in FIG. 7) that cancels out these changes in magnetic flux. 7 and 8, the induced current I and the magnetic field H' generated by the induced current I are indicated by gray arrows.

FIGS. 8A and 8B show an example in which the deformation of the magnetic elastic body 20 changes the size of the portion of the magnetic elastic body 20 disposed within the electromagnetic induction coil 12 . ing. In this case, it is considered that the magnetic flux passing through the electromagnetic induction coil 12 changes due to factors other than the change in the magnetization of the magnetic elastic body 20, as described below.

In the examples of FIGS. 8A and 8B, the magnetic elastic body 20 is compressed in the axial direction of the electromagnetic induction coil 12 . In this case, the magnetic elastic body 20 exists in the region within the electromagnetic induction coil 12 before the deformation of the magnetic elastic body 20 (FIG. 8A), while after the deformation (FIG. 8B) A region R is provided where the magnetic elastic body 20 does not exist. In this region R, the magnetic flux changes before and after the deformation of the magnetoelastic body 20. Therefore, it is considered that a magnetic field H″ is generated in the region R so as to cancel this change in magnetic flux. , can be in the opposite direction to the magnetic field H′ due to the change in the distribution density of the particles 23 of the magnetic powder 22 in the magnetic elastic body 20, but these magnetic fields always have the same magnitude during the process of deforming the magnetic elastic body 20. Therefore, it is conceivable that an induced current I can be generated in the electromagnetic induction coil 12 due to a change in the magnetic flux passing through the electromagnetic induction coil 12 . When the magnetic field H' and the magnetic field H'' are generated in opposite directions, the electromagnetic induction coil 12V may be arranged to surround the region R as shown in FIG. , the induced current generated by the magnetic field H′ and the induced current generated by the magnetic field H″ are generated in separate circuits, it is possible to prevent the induced currents from canceling each other out. The expansion of the magnetic elastic body 20 is the same as the compression of the magnetic elastic body 20 .

As described above, the induced current I generated by the power generation section 10 is rectified by the rectification section 91 and received by the load section 92 . Then, the wireless module 92A of the load section 92 outputs a wireless signal including the identification number information. As a result, a wireless terminal located away from the electrical device 100A can receive the wireless signal from the electrical device 100A and monitor the load and behavior of the pair of opposed members 201 and 202 .

A plurality of electric devices 100A of the present embodiment are set in a gap between a bridge girder and a bridge body of a viaduct, a gap under the floor of a building having a seismic isolation structure, a gap under the road surface, etc. By storing the installation location and identification number of each electrical device 100A in association with each other and monitoring wireless signals from the plurality of electrical devices 100A with a monitoring terminal, the behavior and abnormalities of viaducts and buildings due to typhoons, earthquakes, etc., can be detected. It is possible to monitor the presence or absence of

As described above, the electric device 100A of the present embodiment changes the magnetic flux density of the magnetic field penetrating the electromagnetic induction coil 12 by deformation of the magnetic elastic body 20, and performs self-power generation by electromagnetic induction. The structure related to power generation can be simplified compared to electrical equipment that generates power with

In addition, since the magnetic elastic body 20 is a foamed elastomer, it can be expanded and contracted with a larger stroke than when the magnetic elastic body is formed of an elastic body such as a general resin including a non-foamed elastomer or a metal. . Further, since the magnetic elastic body 20 can generate power by changing the magnetic flux density by deformation of a large stroke, the amount of power generated per stroke can be reduced compared to the magnetic elastic body 20 that can change the magnetic flux density only in a short stroke. can do a lot. In addition, if the same amount of power generation is obtained as in the case where the magnetic flux density can be changed only in a short stroke, it becomes possible to generate power in which the direction of the magnetic flux is reversed in a long cycle. In other words, the power generation unit 10 included in the electric device 100A of the present embodiment can generate low-frequency alternating current, and the impedance between the power generation unit 10 and the rectifying unit 91, the load unit 92, etc. connected thereto is thereby reduced. Alignment is easily achieved. Furthermore, since the magnetic elastic body 20 can suppress a change in radial size due to expansion and contraction as described above, interference with the electromagnetic induction coil 12 can be suppressed. In addition, since the magnetic elastic body 20 is made of a foamed elastomer, it is difficult to break and easy to handle.

[Second embodiment]
An electric device 100B of this embodiment is shown in FIG. 10, and differs from the first embodiment in the configuration of a rectifying section 91V and a load section 92V. That is, the rectifying section 91V is a double voltage rectifying circuit, and the secondary battery 91A is connected between a pair of output terminals of the rectifying section 91V. The load section 92V is provided with a detection circuit 92B and a radio circuit 92C, and a current detection section 92D for detecting an induced current flowing through the electromagnetic induction coil 12 is connected to the load section 92V. Furthermore, the detection circuit 92B includes an A/D converter and a microcomputer. Based on the induced current generated by the electromagnetic induction coil 12, detection data for identifying the external force applied to the electrical device 100B is generated, and the detection data is wirelessly transmitted by the wireless circuit 92C. The detection data includes various data such as FFT data and spectrum data of the induced current, data of peak values included in the waveform of the induced current, and the like.

In the electric device 100B of the present embodiment, the detection data for specifying the external force is generated based on the induced current generated by the power generation unit 10 and then wirelessly transmitted. Data acquisition that is less susceptible to noise due to transmission becomes possible. In addition, provision of the secondary battery 91A stabilizes power supply to the load section 92V.

[Third embodiment]
An electric device 100C according to a third embodiment of the present disclosure is shown in FIG. 11 and is mounted on a vehicle 60 for charging a battery 51 of the vehicle 60. FIG. Only the configuration different from the first and second embodiments will be described below.

The power generation section 10 of the electric device 100</b>C of this embodiment is assembled to the suspension 61 of the vehicle 60 . A suspension 61 of the vehicle 60 has a shock absorber 62 and a suspension spring 63, as shown in FIG. 11(B). The suspension spring 63 is sandwiched between a flange portion 65T projecting outward from the cylinder 65 of the shock absorber 62 and the vehicle body 60B. The magnetic elastic body 20V included in the power generation section 10 of the electric device 100C is formed in a tubular shape and fitted to the piston rod 64 of the shock absorber 62 so as to function as a bound stopper. That is, the magnetic elastic body 20V is compressed between the cylinder 65 and the vehicle body 60B when the shock absorber 62 is contracted, and serves to suppress the bounce of the vehicle 60. FIG.

The electromagnetic induction coil 12 of the power generating section 10 of the electric device 100C is arranged inside the suspension spring 63 so as to surround the magnetic elastic body 20V, and its upper end is fixed to the vehicle body 60B. Electric power is generated so that an induced current flows through the electromagnetic induction coil 12 by the expansion and contraction of the magnetic elastic body 20V.

A rectifying section 91W of the electric device 100C boosts the electric power generated by the power generating section 10 to a voltage necessary for charging the battery 51 . Then, the battery 51 corresponding to the load section of the electric device 100C is charged with the output of the power generation section 10 through the rectification section 91W.

In the above-described embodiment, an automobile is exemplified as the vehicle 60, but it may be applied to a vehicle suspension such as a two-wheeled vehicle or an electric train. Examples of automobiles include electric vehicles such as electric vehicles, hybrid vehicles, and plug-in hybrid vehicles.

[Fourth Embodiment]
An electric device 100D of the fourth embodiment is shown in FIG. 12, and has a power generating section 10 similar to that of the electric device 100C of the third embodiment, and a rectifier similar to that of the electric device 100B of the second embodiment. 91V and a detection circuit 92B as a load section. Then, the detection data generated by the detection circuit 92B is provided to the control device 86 of the vehicle 60. FIG. Based on the given detection data, the control device 86 determines the presence or absence of an abnormality such as an overload of the vehicle 60 or a failure of the suspension 61. If an abnormality is detected, the warning light 85 is turned on to inform the driver of the abnormality. do.

In the above-described embodiment, the vehicle 60 is equipped with the electric device 100D to detect an abnormality related to the vehicle 60. may be configured to detect.

[Fifth embodiment]
An electric device 100E of this embodiment is shown in FIGS. 13A and 13B, and is incorporated in a floor structure 71 of a building or vehicle. Specifically, the floor structure 71 has a structure in which a floor panel 73 is laid on a base 72, and a plurality of cushioning materials 78 are laid between the base 72 and the floor panel 73. . When a load is applied to the floor panel 73, the cushioning material 78 is elastically deformed. One or some of the multiple cushioning materials 78 are the magnetic elastic bodies 20W, and the electromagnetic induction coil 12 is provided so as to surround the magnetic elastic bodies 20W. Further, the electric device 100</b>E includes a rectifying section and a wireless module similar to those in the first embodiment housed in the circuit case 33 .

[Sixth Embodiment]
An electric device 100F of the present embodiment is shown in FIG. 14, in which the magnetic elastic body 20 undergoes torsional deformation upon receiving an external force. Specifically, the electric device 100F eliminates the adjustment mechanism 35 from one cylinder 32 of the expansion case 30 of the electric device 100A of the first embodiment, and replaces the plurality of projecting pieces 31B with the other cylinder 32. The magnetic elastic body 20 and the electromagnetic induction coil 12 having the same shape as the magnetic elastic body 20 and the electromagnetic induction coil 12 of the electric device 100A of the first embodiment are provided in the twist case 30V. The twist case 30V is attached in the middle of a pair of relatively rotating members and a shaft that receives load torque. As a result, the pair of cylinders 31 and 32 rotate relatively by receiving an external force as load torque, and the magnetic elastic body 20 is twisted. Further, the magnetic elastic body 20 is placed in a magnetic field directed in the axial direction of the magnetic elastic body 20 in a torsionally deformed state, and the magnetic powder 22 is magnetized. Other structures are the same as those of the electric device 100A of the first embodiment.
In this electric device 100F, when the magnetic elastic body 20 is torsionally deformed in one direction, the magnetic moment of the magnetic particles 22 of the magnetic powder 22 aligns in the direction of penetrating the electromagnetic induction coil 12, and when torsionally deformed in the other direction, magnetic The direction of the magnetic moment of the powder 22 is aligned in a direction different from the direction of penetrating the electromagnetic induction coil 12, or varies. As a result, the density of the magnetic flux penetrating the electromagnetic induction coil 12 changes with the torsional deformation of the magnetic elastic body 20, and the power generation section 10 generates power. A radio signal is transmitted.

[Seventh Embodiment]
An electric device 100G of the present embodiment is shown in FIG. 15 and includes a twist case 30W obtained by adding a screwing mechanism to the twist case 30V of the electric device 100F of the sixth embodiment. Specifically, the outer surface of one cylindrical body 31 of the twist case 30W is provided with an engaging portion 31M having a spirally extending groove structure or a ridge structure, and the inner surface of the other cylindrical body 32 is provided with an engaging portion 31M. An engaging portion (not shown) that is screwed with the portion 31M is provided. Accordingly, when the cylinders 31 and 32 of the twist case 30W rotate relative to each other, the magnetic elastic body 20 is twisted and stretched. An induced current is thereby induced in the electromagnetic induction coil 12 .

[Eighth Embodiment]
An electric device 100H of this embodiment is shown in FIG. As shown in FIG. 16(A), the power generation unit 10 of the electric device 100H includes a cylindrical magnetic elastic body 20 that is just fitted to the shaft 203, which is the object of detecting bending deformation, and the magnetic elastic body 20. and an electromagnetic induction coil 12 fitted to the outside of the coil. Then, as shown in FIG. 16B, the magnetic elastic body 20 and the electromagnetic induction coil 12 are bent together with the shaft 203 . Further, the electric device 100H includes, for example, a rectifying section 91 and a wireless module 92A, which are similar to those of the electric device 100A of the first embodiment, housed in the circuit case 33 . As the magnetic elastic body 20 bends along with the bending deformation of the shaft 203, the magnetic flux density penetrating the electromagnetic induction coil 12 changes and the power generation unit 10 generates power. A wireless signal is transmitted from the wireless module 92A of the unit 92 .

[Ninth Embodiment]
An electric device 100I of the present embodiment is shown in FIG. 17(A), and includes a pair of non-magnetic discs 39 facing each other, and a plurality of magnetic discs 39 between the pair of discs 39. It has a structure in which elastic bodies 20 are connected in parallel. Specifically, the plurality of magnetic elastic bodies 20 have, for example, a columnar shape, and form an imaginary circle concentric with the central axis of the pair of discs 39 in a portion inside the outer edge of the pair of discs 39. The central axis of each magnetic elastic body 20 is arranged at a position divided into a plurality of equal parts, and each magnetic elastic body 20 is fixed to a pair of discs 39 with an adhesive applied to both end faces of each magnetic elastic body 20. there is A plurality of mounting holes 39A are formed in the outer edge of the pair of discs 39. As shown in FIG.

An electromagnetic induction coil 12 is fitted to the outside of each magnetic elastic body 20 . A plurality of rectifying units 91 and wireless modules 92A described in the first embodiment are provided corresponding to the plurality of electromagnetic induction coils 12 and housed in the circuit case 33 . Then, each time an induced current having a predetermined abnormal magnitude flows through each electromagnetic induction coil 12, a wireless signal containing information on an identification number unique to each electromagnetic induction coil 12 is transmitted from the wireless module 92A corresponding to each electromagnetic induction coil 12. .

The electric device 100I of this embodiment is used with a pair of discs 39 fixed to the object to be detected. Then, the behavior of the pair of discs 39 approaching and separating, the behavior of the other disc 39 tilting in an arbitrary direction with respect to one disc 39, the behavior of one disc 39 On the other hand, electric power is generated by the plurality of electromagnetic induction coils 12 in accordance with the behavior of the other disc 39 rotating around the central axis, and a radio signal is output in accordance with the power generation state.

Further, as shown in FIG. 17(B), an additional component 38 having a column 38A erected from the center of a disc 38C and a mass 38B at the tip thereof is prepared, and the disc 38C of the additional component 38 is prepared. By overlapping and fixing one disc 39 of the electric device 100I and fixing the other disc 39 to a building, a vehicle, the ground, or the like, it is possible to detect vibrations or the like received by the electric device 100I.

[Confirmation experiment]
An experiment confirmed that the electromagnetic induction coil 12 and the magnetic elastic body 20 described in the first embodiment generate power. Specifically, the induced electromotive force generated in the electromagnetic induction coil 12 was confirmed as a substitute value for the induced current I.

I. Configuration of Electromagnetic Induction Device The electromagnetic induction coil 12 is made of copper wire, and has a winding diameter (inner diameter) of 36 mm (36Φ), an axial length of 70 mm, a wire diameter of 0.5 mm, the number of turns of 1395, and a resistance of 13Ω was used. As the magnetic elastic body 20, a polyurethane foam elastomer 21 in which neodymium-based magnetic powder is dispersed is used. Neodymium-based magnetic powders having different particle sizes (5 μm and 100 μm) were used. The magnetic elastic body 20 is cylindrical, and has a diameter of 23 mm and an axial length of 23 mm. The magnetization condition of the magnetic elastic body 20 was 8 tesla for 3 seconds. The magnetization of the magnetic elastic body 20 was performed in a natural length state and a 50% compressed state in the axial direction. In this experiment, the magnetic elastic body 20 was arranged coaxially with the electromagnetic induction coil 12, and the magnetic elastic body 20 was arranged so that its natural length coincided with the electromagnetic induction coil 12 at its center position. The magnetic elastic body 20 is entirely housed within the electromagnetic induction coil 12, and is arranged so that its axial direction is the vertical direction. deformed.

II. Details of the magnetic elastic body of each experimental example Details of the raw material of the magnetic elastic body 20 are as follows.

(1) Liquid 1 polyol; polyester polyol (molecular weight: 2000, number of functional groups: 2, hydroxyl value: 56 mgKOH/g, product name: "Polylite OD-X-102", manufactured by DIC Isocyanate; 1,5-naphthalenediisocyanate ( NCO%: 40%, product name: "Cosmonate ND", manufactured by Mitsui Chemicals, Inc.)
Neodymium magnetic powder; (1) MQFP (5 μm), manufactured by Magnequench, (2) MQFP (100 μm), manufactured by Magnequench

(2) Liquid 2 Catalyst: Amine catalyst, Product name: "Addocat PP", manufactured by Rhein Chemie Japan Blowing agent: Mixed liquid containing castor oil and water, Product number: "Advade SV" (weight ratio of castor oil and water: 50 : 50), manufactured by Rhein Chemie Japan

Further, in this experiment, the magnetic elastic bodies 20 with different expansion ratios of the foamed elastomer 21, different mixing ratios and particle sizes of the neodymium-based magnetic powder, and different magnetization methods were used (Experimental Examples 1 to 5). The magnetization conditions and characteristic values of the magnetic elastic body 20 in each experimental example are as shown in FIG.

FIG. 19 shows the details and properties of the foamed elastomers of Experimental Examples 1-5. In Experimental Example 1, the expansion ratio of the foamed elastomer 21 was doubled and magnetized in a natural length state. The neodymium-based magnetic powder had a particle diameter of 5 μm, a mass ratio of 50% by mass, and a volume ratio of 3.3. % by volume. Experimental Example 2 is the same as Experimental Example 1 except that the expansion ratio of the foamed elastomer 21 is 4 times and the volume ratio of the neodymium magnetic powder is 1.6% by volume. Experimental Example 3 is the same as Experimental Example 1 except that the mass ratio of the neodymium-based magnetic powder is 60% by mass and the volume ratio is 3.9% by volume. Experimental Example 4 is magnetized in a 50% compressed state in the axial direction, and is the same as Experimental Example 3 in other respects. Experimental Example 5 is the same as Experimental Example 3 except that the particle size of the neodymium magnetic powder is 100 μm.

III. Test method (1) Density and expansion ratio of foamed elastomer A test sample of the columnar magnetic elastic body 20 was prepared, the density was measured based on JIS K6268:1998, and the expansion ratio was calculated from this density.

(2) Mass Ratio and Volume Ratio of Neodymium Magnetic Powder The mass ratio of the neodymium magnetic powder was obtained by measuring the mass of the neodymium magnetic powder with respect to the mass of the first liquid using a scale. The volume ratio of the neodymium-based magnetic powder was calculated from the mass ratio of the neodymium-based magnetic powder, the density of the neodymium-based magnetic powder, and the density of the foamed elastomer 21 using the following formula. Here, the density of the neodymium-based magnetic powder was set to 7.6 g/cm3.
Volume ratio (%) of neodymium-based magnetic powder = (mass ratio of neodymium-based magnetic powder x density of foamed elastomer)/(density of neodymium-based magnetic powder)

(3) Compression permanent strain Compression permanent strain is determined by preparing a test sample of the magnetic elastic body 20 with a diameter of 13 mm and a thickness of 6.3 mm, and applying it to JIS K 6262: 2013 A method (small test piece 70 ° C. x 22 hours, 25% compression).

(4) Repeated compressive strain Repeated compressive strain is 1 Hz for 50% compression in the axial direction with respect to the natural length state (original thickness) for the test sample of the magnetic elastic body 20 with a diameter of 23 mm and an axial length (thickness) of 23 mm. (1 time/second), and the amount of change in thickness before and after this repeated compression test was measured and calculated from the following formula. In addition, this measurement was performed at normal temperature (23° C.).
Cyclic compression strain (%) = (thickness before compression test - thickness after compression test) / (thickness before compression test) x 100

(5) Surface magnetic flux density The surface magnetic flux density is obtained by preparing a test sample of the magnetic elastic body 20 having a diameter of 23 mm and an axial length (thickness) of 23 mm, and measuring the magnetic flux density at the center of the upper surface and the lower surface, which are both end surfaces in the axial direction. Measurement was performed 10 times (20 times in total) using a gauss meter (“MG-601”, manufactured by Magna), and the average value was obtained. In addition, the surface magnetic flux density was measured for the magnetic elastic body 20 in a natural length state and a compressed state compressed by 10%, 25%, and 50% from the natural length state in the axial direction, and the surface of each compressed state with respect to the natural length state The rate of change in magnetic flux density was calculated.

(6) Amount of Power Generation The amount of power generation was measured by vibrating and deforming the magnetic elastic body 20 so as to repeat compression and restoration in the axial direction of the electromagnetic induction coil 12 using a test apparatus 40 shown in FIG. was measured and evaluated. The vibration deformation conditions for the magnetoelastic body 20 were set to 9 conditions consisting of 3 levels of compressibility (stroke amount) and 3 levels of frequency, and the voltage was measured under each condition. Specifically, the amplitude levels are 6 mm, 8 mm, and 10 mm (displacement amount), and the frequency levels are 1 Hz, 5 Hz, and 10 Hz.

Details of the test apparatus 40 are as follows. The test apparatus 40 has a piston 41 and a fixing member 42 that sandwich the magnetic elastic body 20 in the axial direction of the electromagnetic induction coil 12 inside the electromagnetic induction coil 12 . The piston 41 receives power from the drive source 43 and vibrates in the axial direction of the electromagnetic induction coil 12 to deform the magnetic elastic body 20 by vibration. The distance between the fixed member 42 and the piston 41 is set to be the same as the natural length of the magnetic elastic body 20 when the piston 41 is farthest from the fixed member 42 in the vibration stroke. That is, in this experiment, the fixed member 42 and the piston 41 were always in contact with the magnetic elastic body 20 .

Both ends of the electromagnetic induction coil 12 are connected to an oscilloscope 44 , and the induced electromotive force generated in the electromagnetic induction coil 12 is displayed on the oscilloscope 44 . Furthermore, the test device 40 is provided with a laser displacement gauge 45 for detecting vibration of the piston 41 . A signal relating to the amplitude, frequency, etc. of the piston 41 is output from the laser displacement meter 45 to the oscilloscope 44 via the amplifier unit 46, and the amplitude and frequency of the vibration of the piston 41 can be confirmed with the oscilloscope 44.

IV. Test Results In Experimental Examples 1 to 5, since the foamed elastomer 21 is made of a polyurethane elastomer, the compression set is 21 to 25% and the repeated compression set is 13 to 18%, which are good results.

The surface magnetic flux densities in the natural length state of Experimental Examples 1 to 3 are 9.2 mT, 4.6 mT, and 10.3 mT, respectively. It's becoming The surface magnetic flux densities in the natural length state of Experimental Examples 3 and 5 are 10.3 mT and 14.6 mT, and it can be seen that the larger the particle size of the neodymium magnetic powder, the higher the surface magnetic flux density. The surface magnetic flux densities in the natural length state of Experimental Examples 3 and 4 are 10.3 mT and 9.2 mT, and the surface magnetic flux densities of Experimental Example 3 are larger, but the surface magnetic fluxes in the compressed states of 10%, 25%, and 50% are The densities are 10.5 mT and 9.9 mT, 10.7 mT and 10.6 mT, 10.9 mT and 12.6 mT, respectively, and the rate of change is 1.9% and 7.6%, respectively, and 3 9% and 15.2%, 5.8% and 37.0%. In the 50% compressed state, Experimental Example 4 has a higher surface magnetic flux density. This is because, when compressed, the distribution density of the neodymium-based magnetic powder increases, and the directions of the magnetic moments of the neodymium-based magnetic powder are more uniform than in the natural length state. Both the number n of neodymium-based magnetic particles per unit volume and the average value mz of the magnetic moment increased, the magnetization Mz increased, and the rate of change also increased compared to the natural length state. It is considered that the magnetic flux density Bz increased as a result of the increased magnetization Mz (see relational expression (A)). In Experimental Example 3, the rate of change in the surface magnetic flux density with respect to the natural length state is 5.8% even with 50% compression, but in Experimental Example 4, the rate of change with respect to the natural length state with 10% compression is It is 7.6%, and it is possible to increase the change in the surface magnetic flux density (magnetic flux density) even if the degree of elastic deformation is small.

Comparing the power generation amounts of Experimental Examples 1 and 3, it can be seen that the larger the mass ratio (volume ratio) of the neodymium magnetic powder, the larger the power generation amount. Also, it can be seen that the higher the compression rate (displacement) and the higher the frequency, the greater the amount of power generation.

[Other embodiments]
(1) As a device that detects the behavior of a member by utilizing the change in magnetic flux density accompanying elastic deformation of the magnetoelastic body 20, for example, a Hall element, a TMR element (tunnel magnetoresistive effect element), a GMR element (giant magnetic A configuration in which a magnetic sensor such as a resistance effect element) or an AMR element (anisotropic magnetoresistive effect element) is arranged opposite to the magnetic elastic body 20 is also conceivable.

(2) All of the electric devices 100A to 100I described above were designed to operate on the power generated by the power generation section 10, but the power generation section 10 was not used as the power generation section, and the power was either a battery or an external power source ( For example, a commercial power source may be used, and the power generation unit 10 may be used only as a detection unit for detecting external force, deformation of members, or the like, and the load unit may not be provided.

(3) In the same way that the electrical device 100I of the ninth embodiment can be used for torsional deformation, bending deformation, and expansion/contraction deformation, all the electrical devices 100A to 100I described above can be used in other ways. may be used in Also, the electrical loads included in the load units of the electrical devices 100A to 100I may be changed as appropriate.

(4) The magnetic elastic body 20 of the first embodiment is arranged inside the electromagnetic induction coil 12, but the magnetic field generated by the magnetic powder 22 of the magnetic elastic body 20 penetrates the inside of the electromagnetic induction coil 12. If so, the magnetic elastic body 20 may be arranged outside the electromagnetic induction coil 12 .

(5) Although the magnetization direction of the magnetic elastic body 20 is the same as the axial direction of the electromagnetic induction coil 12 in the above embodiment, it may be inclined with respect to the axial direction of the electromagnetic induction coil 12 .

(6) In the above embodiment, the magnetic elastic body 20 has a cylindrical shape, but it is not limited to this, and may be rectangular or spherical. Moreover, it may be in a product shape such as the above-described bound stopper (see FIG. 11(B)).

(7) In the above embodiment, the electromagnetic induction coil 12 and the magnetic elastic body 20 were arranged coaxially, but the central axes of the electromagnetic induction coil 12 and the magnetic elastic body 20 may be shifted and arranged parallel to each other. and may be slanted with respect to each other.

(8) Since the magnetic elastic body 20 has a structure in which the magnetic powder 22 is dispersed in the foamed elastomer 21, it can be easily cut into an arbitrary shape. , the magnetic elastic body 20 may be used for a toy. In addition, since the magnetic elastic body 20 is lighter than a ferrite magnet or the like, it can be used for floating by the magnetic force of another magnet or the like.

(9) In the above embodiment, 1,5-naphthalene diisocyanate (NDI) was used as the isocyanate of the raw material of the magnetic elastic body 20, but diphenylmethane diisocyanate (MDI) may be used.

<Appendix>
Hereinafter, the features of the group of inventions extracted from the above-described embodiments will be described while showing effects and the like as necessary. In the following description, for ease of understanding, configurations corresponding to the above-described embodiments are appropriately shown in parentheses or the like, but are not limited to the specific configurations shown in parentheses or the like.

[Feature A1]
an elastic body that contains an electromagnetic induction coil, magnetized magnetic powder, generates a magnetic field that penetrates the electromagnetic induction coil, and changes the magnetic flux density of the magnetic field when elastically deformed by an external force; An electric device comprising: a rectifying section that rectifies an induced current induced in the electromagnetic induction coil by a change; and a load section that receives power from the rectifying section and operates.

The electrical device of feature A1 has an elastic body that contains magnetized magnetic powder and generates a magnetic field penetrating an electromagnetic induction coil. When such an elastic body receives an external force and elastically deforms, the magnetic flux density of the magnetic field penetrating the electromagnetic induction coil changes, and self-power generation is performed by electromagnetic induction. Then, the induced current flowing through the electromagnetic induction coil is rectified and applied to the load section to drive the load section. As described above, the electric device of feature A1 can generate power by itself with an elastic body having a simpler structure than a rotating machine included in a conventional electric device.

[Feature A2]
The electric device according to feature A1, wherein the load section includes a radio circuit that outputs a radio signal in response to power reception from the rectification section.

Since the electrical equipment of feature A2 is self-powered and has a wireless circuit, it has a high degree of freedom in terms of installation location.

[Feature A3]
The electric device according to feature A2, wherein the radio circuit outputs a radio signal each time power is received from the rectifying section to notify that the elastic body has received an external force.

The electric device of feature A3 can be installed at a site that receives an external force, and can remotely monitor the state of the external force.

[Feature A4]
Any one of features A1 to A3, wherein the load section includes a detection circuit that generates detection data for identifying the external force based on the induced current, and a radio circuit that wirelessly transmits the detection data. 1. The electrical equipment according to 1.

Since the electric device of feature 4 generates detection data for specifying an external force based on the induced current and then wirelessly transmits the data, data can be collected at a remote value far away from the electric device, which is less susceptible to noise due to wireless transmission. be possible.

[Feature A5]
The electric device according to any one of features A1 to A4, wherein the rectifying section includes a secondary battery that is charged by the induced current and capable of supplying power to the load section.

In feature 5, power supply to the load section is stabilized by providing the secondary battery.

[Feature A6]
The electricity according to any one of features A1 to A5, wherein the direction of the magnetic moment of the magnetic powder changes with the elastic deformation of the elastic body, and the magnetic flux density of the magnetic field penetrating the electromagnetic induction coil changes. machine.

In order to change the magnetic flux density of the magnetic field, the distribution density of magnetic powder that generates a magnetic field that penetrates the electromagnetic induction coil by deformation of the elastic body may be changed. The direction of the moment may be changed between a state in which the direction is aligned in the axial direction of the electromagnetic induction coil and a state in which it is not aligned.

[Feature A7]
The electromagnetic induction coil is wound in an annular or cylindrical shape having an inner space for receiving the elastic body. The electrical equipment according to any one of features A1 to A6, which includes a telescopic support mechanism that transmits the

According to feature 7, it is possible to efficiently generate power with a compact structure.

[Feature A8]
The electric device according to any one of features A1 to A6, comprising a twist support mechanism that transmits the external force so that the elastic body can be twisted around the winding axis of the electromagnetic induction coil.

In feature 8, power can be generated using a rotating external force.

[Feature A9]
The electric device according to any one of features A1 to A8, wherein the elastic body is a foamed elastomer.

Since the elastic body of feature A9 is a foamed elastomer, when it is compressed, the cells are crushed, and when it is stretched, the cells are expanded. As a result, the change in size in the direction orthogonal to the direction of expansion and contraction due to expansion and contraction deformation can be suppressed, and interference between the elastic body and its surrounding parts can be suppressed.

[Feature A10]
The electrical device according to feature A9, wherein the foamed elastomer is a polyurethane elastomer, and the magnetic powder has a particle size of 3 to 200 μm.

Characteristic A10 can speed up the curing of the raw material of the elastic body because the elastic body is a polyurethane elastomer. For example, when the elastic material is non-foamed silicone rubber, it takes time to harden the elastic material, so the magnetic powder settles during hardening of the elastic material, resulting in non-uniform dispersion of the magnetic powder in the elastic material. easy. In contrast, in feature A10, the raw material of the elastic body can be cured before the magnetic powder settles, and the magnetic powder can be uniformly dispersed in the elastic body. As a result, it becomes possible to easily disperse even magnetic powder having a particle diameter of 100 μm or more, and to increase the magnetic flux density of the elastic body. From the standpoint of moldability and ease of deformation of the elastic body, the particle size of the magnetic powder is preferably 200 μm or less.

[Feature A11]
The electric device according to feature A9 or feature A10, wherein the foamed elastomer has an expansion ratio of 1.4 to 6 times and has at least a part with an open cell structure.

In the feature A11, the foamed elastomer has an expansion ratio of 1.4 to 6 times and has at least an open cell structure, so that the elastic body can be easily molded and elastically deformed, and the elastic body can be easily deformed. It is possible to make it easier to change the magnetic flux density. As a result, it becomes possible to make it easy to generate an induced current in the circuit. In addition, since the foamed elastomer has at least a portion with an open cell structure, it is possible to suppress shrinkage (so-called shrinkage) of the foamed elastomer after molding. Note that the above expansion ratio indicates the expansion ratio of the foamed elastomer alone, not the expansion ratio of the elastic body.

[Feature A12]
The magnetic powder is made of a hard ferromagnetic material, the mass concentration of the magnetic powder with respect to the foamed elastomer is 40 to 80%, and the volume concentration of the magnetic powder with respect to the foamed elastomer is 1.0. The electrical device according to any one of features A9 to A11, wherein the electrical appliance is ˜3.5%.

Characteristic A12 makes it possible to increase the change in the magnetic flux density of the elastic body while facilitating elastic deformation of the elastic body.

[Feature A13]
The electrical equipment according to any one of features A1 to A12, wherein the compression set of the elastic body conforming to JIS K 6262:2013 A method is 30% or less.

[Feature A14]
The electric device according to any one of features A1 to A13, wherein the elastic body has a cyclic compression strain of 20% or less when 50% compression is repeated 100,000 times at 1 Hz.

According to features A13 and A14, the foamed elastomer is well restored after being elastically deformed. As a result, even when the elastic body is used in an application where the elastic body is repeatedly compressed and used, the settling of the foamed elastomer is reduced, and the elastic body is more suitable for repeated use.

[Feature A15]
A manufacturing method for manufacturing an electrical device according to any one of features A1 to A14, wherein the magnetic powder is dispersed in the elastic body, and in a state in which the elastic body is elastically deformed, the A method for manufacturing an electric device, in which the magnetic powder is magnetized.

According to the manufacturing method of feature A15, it is possible to easily manufacture an elastic body having a large amount of change in magnetic flux density when compressed.

Although specific examples of the technology included in the claims are disclosed in the specification and drawings, the technology described in the claims is not limited to these specific examples. Various modifications and changes of the examples are included, and a part of specific examples is also included.

10 power generation unit 12, 12V electromagnetic induction coil 20, 20V, 20W magnetic elastic body (elastic body)
21 Elastomer foam 22 Magnetic powder 35 Adjusting mechanism 91, 91V, 91W Rectification unit 91A Secondary battery 92.92V Load unit 100A to 100I Electric equipment

Claims (8)

an electromagnetic induction coil;
an elastic body that contains magnetized magnetic powder, generates a magnetic field that penetrates the electromagnetic induction coil, and changes the magnetic flux density of the magnetic field when elastically deformed by receiving an external force;
a rectification unit that rectifies an induced current induced in the electromagnetic induction coil due to changes in the magnetic flux density;
a load section that operates by receiving power from the rectifying section;
electrical equipment. 2. The electric device according to claim 1, wherein the load section includes a radio circuit that outputs a radio signal in response to power reception from the rectifying section. 3. The electric device according to claim 2, wherein the radio circuit outputs a radio signal each time power is received from the rectifying section to inform that the elastic body has received an external force. The load section includes:
a detection circuit that generates detection data for identifying the external force based on the induced current;
a wireless circuit that wirelessly transmits the detected data;
4. The electrical equipment according to any one of claims 1 to 3, comprising: 5. The electric device according to claim 1, wherein the rectifying section includes a secondary battery that is charged by the induced current and capable of supplying power to the load section. 6. The method according to any one of claims 1 to 5, wherein the direction of the magnetic moment of the magnetic powder changes with the elastic deformation of the elastic body, and the magnetic flux density of the magnetic field penetrating the electromagnetic induction coil changes. Electrical equipment as described. The electromagnetic induction coil is wound in an annular or cylindrical shape having an inner space for receiving the elastic body,
7. The electric device according to any one of claims 1 to 6, further comprising an expansion/contraction support mechanism that transmits the external force so as to expand/contract the elastic body in the winding axis direction of the electromagnetic induction coil. 7. The electric device according to any one of claims 1 to 6, further comprising a twist support mechanism that transmits the external force so that the elastic body can be twisted around the winding axis of the electromagnetic induction coil.

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