JP2021057928A - Power generation device and transmitting device - Google Patents

Abstract

To provide a power generation device that can efficiently convert AC magnetic field energy to an electric power by preventing vibrational energy of a permanent magnet from being dissipated from a stationary part to the surroundings even when the magnet is attached to an unstable place such as a distribution line.SOLUTION: A power generation device includes: a stationary part where a first part of both a first cantilever and a second cantilever is displaceably mounted on a lead wire through which an alternating current flows; a first permanent magnet arranged on a second part of the first cantilever; a second permanent magnet arranged on a second part of the second cantilever; and a piezoelectric member for converting the vibrational energy of the first and second permanent magnets to electric energy when the first and second permanent magnets are vibrated by an alternating current magnetic field formed around the lead wire. The first and second permanent magnets are arranged in such a position and posture that a reactive force generated at the stationary part 2 by the displacement of the first permanent magnet and a reactive force generated at the stationary part 2 by the displacement of the second permanent magnet are canceled.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power generation device that converts an alternating magnetic field into kinetic energy of a permanent magnet and converts the kinetic energy into electric power, and a transmission device including the power generation device.

Patent Document 1 discloses a power generation device that generates electricity by using the energy of an alternating magnetic field generated around a conducting wire. The power generation device according to Patent Document 1 is provided at an elastic body having a piezoelectric member, a fixing portion for fixing one end of the elastic body in a displaceable manner with respect to a conducting wire through which alternating current flows, and the other end of the elastic body. It includes a permanent magnet and an output unit that outputs the voltage generated in the piezoelectric member. The power generation device configured in this way converts the energy of the alternating magnetic field into the kinetic energy of the permanent magnet even if the frequency of the alternating magnetic field formed around the conducting wire is as low as 10 Hz, and the motion is such. Energy can be converted into electric power by a piezoelectric member.

Japanese Unexamined Patent Publication No. 2019-22366

However, there is a problem that the fixed portion that supports the elastic body also vibrates due to the vibration of the permanent magnet, and the power generation efficiency drops. In the method of applying the vibration of the permanent magnet to the piezoelectric member of the elastic body to generate electricity, when the fixed portion is completely stationary, all the vibration energy is transmitted to the piezoelectric member to maximize the power generation. However, when the fixed portion is attached to an unstable object such as a distribution line, the fixed portion also vibrates due to the vibration transmitted through the elastic body, and the maximum power generation cannot be obtained.

An object of the present invention is to prevent the vibration energy of a permanent magnet from being dissipated from a fixed portion to the surroundings even when it is attached to an unstable place such as a distribution line, and efficiently power the energy of an alternating magnetic field. To provide a power generation device and a transmission device that can be converted into.

In the power generation device according to the present invention, the first elastic body and the second elastic body, the first portion of the first elastic body, and the first portion of the second elastic body can be displaced with respect to the conducting wire through which the alternating current flows. A fixing portion to be fixed, a first permanent magnet provided in the second portion of the first elastic body, a second permanent magnet provided in the second portion of the second elastic body, and formed around a conducting wire. When the first permanent magnet and the second permanent magnet vibrate due to the alternating magnetic field, the first permanent magnet and the second permanent magnet are provided with a conversion unit that converts the vibration energy into electrical energy. The position and orientation of the magnet and the second permanent magnet are such that the reaction force generated in the fixed portion by the vibration of the first permanent magnet and the reaction force generated in the fixed portion by the vibration of the second permanent magnet cancel each other out. It is provided in.

In the present invention, the first permanent magnet and the second permanent magnet vibrate by the alternating magnetic field formed around the conducting wire. The conversion unit converts the vibration energy of the first permanent magnet and the second permanent magnet into electrical energy. The power generation device according to the present invention can generate power using the alternating magnetic field as an energy source even if the frequency of the alternating magnetic field is as low as 10 Hz.
Further, in order to prevent the vibrations of the first permanent magnet and the second permanent magnet from being transmitted to the fixed portion and causing the fixed portion to vibrate, the power generation device according to the present invention has a pair of permanent magnets, that is, a first permanent magnet. It includes one permanent magnet and a second permanent magnet. Further, the reaction force generated in the fixed portion due to the vibration of the first permanent magnet and the reaction force generated in the fixed portion due to the vibration of the second permanent magnet cancel each other out so that the center of gravity of the fixed portion does not move.
Therefore, it is possible to prevent the vibration energy of the first and second permanent magnets from being dissipated from the fixed portion to the surroundings, and the conversion portion can convert the vibration energy into electric power without waste. Therefore, the power generation device according to the present invention can efficiently convert the energy of the alternating magnetic field into electric power.

In the power generation device according to the present invention, the arrangement direction of the north pole and the south pole constituting the first permanent magnet is the circumferential direction of the conducting wire, and the arrangement direction of the north pole and the south pole constituting the second permanent magnet is. The north and south poles constituting the first permanent magnet are arranged in the opposite directions to each other, and the first permanent magnet and the second permanent magnet are provided at positions opposite to each other with the lead wire interposed therebetween. ..

In the present invention, the first and second permanent magnets are located on opposite sides of the conducting wire. The first and second permanent magnets vibrate in the radial direction of the conducting wire, and the vibrating directions are opposite.
Therefore, the reaction force generated in the fixed portion due to the vibration of the first and second permanent magnets cancels out, and the center of gravity of the fixed portion does not move.

In the power generation device according to the present invention, the first permanent magnet and the second permanent magnet form an annular shape surrounding the conducting wire, and the arrangement directions of the north and south poles constituting the first permanent magnet are the diameters of the conducting wires. The direction of arrangement of the north and south poles constituting the second permanent magnet is opposite to the arrangement direction of the north and south poles constituting the first permanent magnet, and the arrangement direction of the first permanent magnet and the south pole is opposite to the arrangement direction of the first permanent magnet and the south pole. The second permanent magnets are provided at positions opposite to each other with the fixed portion interposed therebetween.

In the present invention, the first and second permanent magnets are located on opposite sides of the fixed portion. The first and second permanent magnets vibrate in the circumferential direction of the conducting wire, and the vibrating directions are opposite.
Therefore, the reaction force generated in the fixed portion due to the vibration of the first and second permanent magnets cancels out, and the center of gravity of the fixed portion does not move.

In the power generation device according to the present invention, the resonance frequencies of the first permanent magnet and the first elastic body are substantially the same as the resonance frequencies of the second permanent magnet and the second elastic body.

In the present invention, since the first and second permanent magnets have substantially the same resonance frequency, the magnitudes of vibration of the first and second permanent magnets can be balanced.
Therefore, the reaction force generated in the fixed portion due to the vibration of the first and second permanent magnets can be reliably canceled.

In the power generation device according to the present invention, the first elastic body and the second elastic body are cantilever, and the conversion unit is a piezoelectric member provided on the cantilever.

In the present invention, the vibration energy of the first and second permanent magnets can be converted into electric power by the piezoelectric member. Power generation using an alternating magnetic field is possible with a simple configuration in which the first and second permanent magnets are provided at the free ends of the first and second cantilever.

The power generation device according to the present invention includes a first elastic body, a second elastic body, a third elastic body and a fourth elastic body, and the first elastic body, the second elastic body, the third elastic body and the fourth elastic body. A fixed portion for fixing the first portion of the elastic body so as to be displaceable with respect to a conducting wire through which alternating current flows, a first permanent magnet provided at the second portion of the first elastic body, and a second elastic body. A second permanent magnet provided at two parts, a third permanent magnet provided at the second part of the third elastic body, and a fourth permanent magnet provided at the second part of the fourth elastic body. When the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet vibrate due to the alternating magnetic field formed around the conducting wire, the first permanent magnet, the second permanent magnet, and the like. The first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet are provided with a third permanent magnet and a conversion unit that converts the vibration energy of the fourth permanent magnet into electrical energy. , The first permanent magnet, the second permanent magnet, the third permanent magnet, and the reaction force generated in the fixed portion due to the vibration of the fourth permanent magnet are provided at positions and postures that cancel each other out.

In the present invention, it is possible to prevent the vibration energy of the first to fourth permanent magnets from being dissipated from the fixed portion to the surroundings, and the conversion portion can convert the vibration energy into electric power without waste. Therefore, the power generation device according to the present invention can efficiently convert the energy of the alternating magnetic field into electric power.

The transmission device according to the present invention includes any one of the above-mentioned power generation devices and a transmission unit that transmits a signal, and the transmission unit is driven by a voltage output from the power generation device.

In the present invention, the transmission unit can be driven by using the electric power generated by the power generation device. Therefore, it is possible to transmit a signal from the transmission unit even in an environment where a power supply cannot be prepared.

According to the present invention, even when the permanent magnet is attached to an unstable place such as a distribution line, the vibration energy of the permanent magnet is prevented from being dissipated from the fixed portion to the surroundings, and the energy of the alternating magnetic field is efficiently powered. Can be converted to.

It is a perspective view of the power generation apparatus which concerns on Embodiment 1 of this invention. It is operation explanatory drawing of the power generation apparatus which concerns on Embodiment 1 of this invention. It is operation explanatory drawing of the power generation apparatus which concerns on a comparative example. It is a perspective view of the power generation apparatus which concerns on Embodiment 2 of this invention. It is operation explanatory drawing of the power generation apparatus which concerns on Embodiment 2 of this invention. It is operation explanatory drawing of the power generation apparatus which concerns on Embodiment 3 of this invention. It is operation explanatory drawing of the power generation apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the current detection apparatus which concerns on this Embodiment 4.

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments thereof.
(Embodiment 1)
FIG. 1 is a perspective view of the power generation device 100 according to the first embodiment of the present invention. The power generation device 100 according to the first embodiment of the present invention includes a first cantilever 11 as an elastic body having a piezoelectric member 11c, a second cantilever 12 as an elastic body having a piezoelectric member 12c, and a first cantilever 11 and a second cantilever. The fixed portions 11a and 12a (first part) of the cantilever 12 are fixed displaceably with respect to the conducting wire W through which low-frequency AC of 10 Hz order flows, and the free ends 11b (first part) of the first cantilever 11 are fixed. The first permanent magnet 31 provided at the two parts), the second permanent magnet 32 provided at the free end 12b (second part) of the second cantilever 12, and the piezoelectric members of the first cantilever 11 and the second cantilever 12. It is provided with an output unit 4 that outputs the voltage generated in 11c and 12c. In the first embodiment, the lead wire W is a linear member made of a material having a substantially circular cross section capable of passing an electric current, and the lead wire W is connected to a system power supply of 50 Hz or 60 Hz. To do. The power generation device 100 converts the alternating magnetic field formed around the lead wire W into the kinetic energy of the first and second permanent magnets 31, 32, and converts the kinetic energy of the first and second permanent magnets 31, 32 into the piezoelectric member 11c. , 12c converts it into electric power to generate electricity.
The configuration of the conducting wire W is an example, and the shape is not particularly limited as long as a current capable of forming an alternating magnetic field that vibrates the first and second permanent magnets 31 and 32 flows. It may be a rail-shaped conductive member, a bus bar, a prismatic conductor, or a plate-shaped conductor having a longitudinal direction. Further, the lead wire W may partially have a non-linear portion such as a square plate, and may have a shape in which an alternating current flows in a predetermined direction as a whole. The present invention also includes a configuration in which the power generation device 100 is fixed to the non-linear portion. Further, the lead wire W does not necessarily have to be linear, and may be partially curved. Furthermore, the lead wire W is not limited to that for a specific purpose, and may be a ground wire. Hereinafter, in the first embodiment, it is assumed that the lead wire W is a linear member.

The first cantilever 11 and the second cantilever 12 are power generation members using, for example, a bimorph type piezoelectric element. Since the first and second cantilever 11 and 12 have the same configuration, the configuration of the first cantilever 11 will be described here, and the description of the second cantilever 12 will be omitted. The first cantilever 11 includes a long plate portion made of a conductive member that can be elastically deformed by an external force, and two plate-shaped or sheet-shaped piezoelectric members 11c polarized in the thickness direction, and the two piezoelectric members 11c are provided. It is attached to both sides of the long plate portion so as to sandwich the long plate portion. The length of the piezoelectric member 11c in the longitudinal direction is sufficient to be about 2/3 of the length of the protruding portion from the fixing portion 2 of the long plate portion. Further, each of the two piezoelectric members 11c is provided with a sheet-shaped electrode. The member constituting the long plate portion is a metal such as stainless steel. The piezoelectric member 11c is, for example, piezoelectric ceramics. One end in the longitudinal direction of the long plate portion is a fixed end 11a fixed to the fixed portion 2, and the other end in the longitudinal direction of the long plate portion is a free end 11b that can be displaced by an external force. When the free end 11b is displaced, the two piezoelectric members 11c expand and contract, respectively, and a voltage is generated between the electrode and the long plate portion.
Although the bimorph type piezoelectric element has been described here, it may have a unimorph structure in which the piezoelectric member 11c is attached to only one side. The piezoelectric member 11c is an example of a conversion unit that converts the vibration energy of the first permanent magnet 31 that vibrates by the alternating magnetic field formed around the conducting wire W into electrical energy.

The fixing portion 2 is a member that fixes the fixing ends 11a and 12a of the first cantilever 11 and the second cantilever 12 to the lead wire W. The fixing portion 2 has, for example, a substantially rectangular parallelepiped shape and has a through hole through which the lead wire W is inserted. The through hole has a front view circular shape penetrating the central portion. The fixed end 11a of the first cantilever 11 is fixed to one side of the fixing portion 2 on which the through hole is formed, and holds the first cantilever 11. The fixed end 12a of the second cantilever 12 is fixed to the other side of the fixing portion 2 facing the one side, and holds the second cantilever 12. More specifically, the fixing portion 2 sets the first cantilever 11 and the second cantilever 12 so that the free ends 11b and 12b of the first cantilever 11 and the second cantilever 12 are displaced or vibrate in the radial direction of the lead wire W. keeping.

The first permanent magnet 31 has a rectangular plate shape, and is adhesively fixed to the free end 11b of the first cantilever 11 in a posture in which the arrangement direction of the north pole 31a and the south pole 31b faces the circumferential direction of the lead wire W. Further, the second permanent magnet 32 has a rectangular plate shape, and the arrangement direction of the north pole 32a and the south pole 32b faces in the direction opposite to the arrangement direction of the north pole 31a and the south pole 31b constituting the first permanent magnet 31. The second cantilever lever 12 is adhesively fixed to the free end 12b.
The resonance frequencies of the first and second permanent magnets 31 and 32 provided on the first and second cantilever 11 and 12 are configured to substantially match the frequency of the alternating magnetic field formed around the lead wire W. .. Needless to say, the resonance frequency is the resonance frequency of the vibrating portion including the first cantilever 11 and the first permanent magnet 31, and the resonance frequency of the vibrating portion including the second cantilever 12 and the second permanent magnet 32. Hereinafter, the resonance frequency of the first permanent magnet 31 and the resonance frequency of the second permanent magnet 32 are assumed to be resonance frequencies in the above sense. For example, when the frequency of the alternating magnetic field is 50 Hz, the resonance frequency of the first and second permanent magnets 31 and 32 is 50 Hz, and when the frequency of the alternating magnetic field is 60 Hz, the resonance frequencies of the first and second permanent magnets 31 and 32 are set to 50 Hz. The resonance frequency is 60 Hz. Note that the resonance frequency substantially matches the frequency of the alternating magnetic field means that the power generation device 100 according to the first embodiment also includes a configuration in which the resonance frequency deviates from the frequency of the alternating magnetic field within the range in which the required power can be obtained. means.

The first and second permanent magnets 31 and 32 have dimensions in which each part receives a magnetic force in the same direction at least at the vibration center position. Preferably, the first and second permanent magnets 31 and 32 have dimensions in which each part receives a magnetic force in the same direction at an arbitrary vibration position.

The resonance frequencies of the first cantilever 11 and the first permanent magnet 31 are substantially the same as the resonance frequencies of the second cantilever 12 and the second permanent magnet 32. Preferably, the dimensions, shape, and elastic modulus of the first cantilever 11 and the second cantilever 12 are substantially the same, and the dimensions and shapes of the first permanent magnet 31 and the second permanent magnet 32 are substantially the same. Further, it is preferable that the mounting positions and postures of the first cantilever 11 and the second cantilever 12 with respect to the fixing portion 2 are symmetrical with respect to the plane passing through the center line of the lead wire W.

The output unit 4 is connected to the electrodes of the first cantilever 11 and the second cantilever 12 and the long plate portion, and the voltage generated in the piezoelectric member 11c expanded and contracted by the vibrations of the first and second permanent magnets 31 and 32. Is a circuit that outputs. The output unit 4 includes, for example, a rectifier circuit and a DC-DC converter. The rectifier circuit is, for example, a diode bridge circuit. The input terminal of the rectifier circuit is connected to the piezoelectric members 11c and 12c and the long plate portion, and the output terminal of the rectifier circuit is connected to the input terminal of the DC-DC converter. The alternating current generated in the piezoelectric members 11c and 12c is full-wave rectified by the rectifier circuit and converted into a predetermined voltage by the DC-DC converter. The DC voltage converted to a predetermined voltage by the DC-DC converter is applied to the external load R.

FIG. 2 is an operation explanatory view of the power generation device 100 according to the first embodiment of the present invention, and FIG. 3 is an operation explanatory view of the power generation device 10 according to a comparative example. In order to show the effect of the power generation device 100 according to the first embodiment, the power generation device 10 according to the comparative example is shown in FIG. The power generation device 10 according to the comparative example includes a first cantilever 11, a first permanent magnet 31, a fixing unit 2 and an output unit 4 similar to the power generation device 100 according to the first embodiment, and the power generation device 100 according to the first embodiment. The second cantilever 12 and the second permanent magnet 32 of the above are not provided.

When the power generation device 10 is attached to a conducting wire W such as a distribution line through which an alternating current flows, the first permanent magnet 31 starts to vibrate due to an alternating magnetic field as shown in FIG. However, in the case of the power generation device 10 according to the comparative example, the vibrations of the first permanent magnet 31 and the first cantilever 11 are transmitted to the fixed portion 2 as shown by the wavy arrows in FIG. Due to the reaction generated in the fixed portion 2 by the vibration, the fixed portion 2 also vibrates. When the fixed portion 2 vibrates, a part of the vibration energy of the first permanent magnet 31 is dissipated to the surroundings and is lost.

In order to solve such a problem, the power generation device 100 according to the first embodiment includes a second cantilever 12 and a second permanent magnet 32 paired with the first cantilever 11 and the first permanent magnet 31. According to the power generation device 100 according to the first embodiment, as shown in FIG. 2, the first permanent magnet 31 and the second permanent magnet 32 vibrate in the radial direction of the lead wire W. The reaction force generated in the fixed portion 2 by the vibration of the first permanent magnet 31 and the reaction force generated in the fixed portion 2 by the vibration of the second permanent magnet 32 cancel each other out, and the center of gravity of the fixed portion 2 moves or the fixed portion 2 The force that rotates the magnet does not work. Therefore, the fixed portion 2 does not vibrate, and the vibration energy of the first permanent magnet 31 and the second permanent magnet 32 is not dissipated to the surroundings, and is converted into electric power by the piezoelectric members 11c and 12c without waste.

As described above, according to the power generation device 100 according to the first embodiment, the vibration energy of the first permanent magnet 31 and the second permanent magnet 32 is generated even when the power generation device 100 is attached to an unstable place such as a distribution line. It is possible to prevent the fixed portion 2 from radiating to the surroundings and efficiently convert the energy of the alternating magnetic field into electric power.

Further, since the first and second permanent magnets 31 and 32 have substantially the same resonance frequency, the first and second permanent magnets 31 and 32 stably vibrate in opposite directions in substantially the same period. Therefore, the reaction force generated in the fixed portion 2 due to the vibration of the first and second permanent magnets 31 and 32 can be reliably canceled, and the power can be generated efficiently.

In the first embodiment, an example including a pair of the first and second cantilever 11 and 12 and the first and second permanent magnets 31 and 32 of the fixing portion 2 has been described, but two or more pairs of the first and the first and the second cantilever are described. A second cantilever and first and second permanent magnets may be provided. Specifically, a pair of first and second cantilever 11 and 12 and first and second permanent magnets 31 and 32 are provided and fixed on one surface side (the portion on the right side in FIG. 1) having a through hole of the fixing portion 2. It is preferable to provide another pair of first and second cantilever and first and second permanent magnets on the other surface side (the portion on the left side in FIG. 1) having the through hole of the part 2. The stability of the fixed portion 2 becomes higher.
Further, two pairs of first and second cantilever and first and second permanent magnets may be provided on one surface side (the portion on the right side in FIG. 1) having the through hole of the fixing portion 2.

Further, in the first embodiment, the piezoelectric members 11c and 12c have been described as an example of the conversion unit that converts the vibration energy of the first permanent magnet 31 and the second permanent magnet 32 into electrical energy. It is not limited to this. An electret generator may be used instead of the piezoelectric members 11c and 12c.

The electret generator that converts the vibration energy of the first permanent magnet 31 into electrical energy is a conductive second electrode having a first electrode substrate having a plurality of electrets and a plurality of counter electrodes facing each of the plurality of electrets. It is equipped with a substrate. An electret is a charged body that stores an electric charge. The electret holds the charge semi-permanently and forms an electric field. The first electrode substrate is fixed to the first permanent magnet 31 in such a posture that a plurality of electrets are lined up in the vibration direction of the first permanent magnet 31.

The second electrode substrate is fixed so that the position with respect to the lead wire W does not change in a posture in which the plurality of counter electrodes face each of the plurality of electrets. For example, the second electrode substrate is fixed to the fixing portion 2. The counter electrode is a conductive member, and charges are stored by electrostatic induction.

The first permanent magnet 31 vibrates due to the alternating magnetic field formed around the lead wire W. When the first permanent magnet 31 vibrates, the relative position between the electret and the counter electrode changes, and the electric charge moves. In this way, the electret generator can convert the vibration energy of the first permanent magnet 31 into electrical energy, and the voltage generated by the transfer of electric charges is output from the output unit 4.

A similar electret generator may be provided on the second permanent magnet 32.
Further, as the conversion unit, a known generator capable of converting the vibration energy of the first and second permanent magnets 31 and 32 into electrical energy, such as a generator having a magnetostrictive element, may be used.

(Embodiment 2)
Since the configurations of the first and second cantilever and the first and second permanent magnets of the power generation device according to the second embodiment are different from those of the first embodiment, the above differences will be mainly described below. Since other configurations and actions and effects are the same as those in the first embodiment, the corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 is a perspective view of the power generation device 200 according to the second embodiment of the present invention. The power generation device 200 according to the second embodiment includes an annular first permanent magnet 231 coaxially arranged with respect to the lead wire W.
The first permanent magnet 231 is supported by the fixing portion 2 by two first cantilever 211, 211 so that the center line substantially coincides with the center line of the lead wire W. The first cantilever 211 and 211 have piezoelectric members 211c and 211c, respectively. The N pole 231a and the S pole 231b constituting the first permanent magnet 231 are arranged in the thickness direction, that is, in the radial direction of the lead wire W. The N pole 231a is arranged on the outer side in the radial direction, and the S pole 231b is arranged on the inner side in the radial direction.

The power generation device 200 according to the second embodiment further includes an annular second permanent magnet 232 similar to the first permanent magnet 231 arranged coaxially with the lead wire W. The second permanent magnet 232 is supported by the fixing portion 2 by two second cantilever 212, 212 so that the center line substantially coincides with the center line of the lead wire W. The second permanent magnet 232 is arranged on the opposite side of the first permanent magnet 231 with the fixing portion 2 interposed therebetween. The second cantilever 212 and 212 have piezoelectric members 212c and 212c, respectively. The arrangement direction of the N pole 232a and the S pole 232b constituting the second permanent magnet 232 is opposite to the arrangement direction of the N pole 231a and the S pole 231b constituting the first permanent magnet 231. The N pole 231a is arranged in the radial direction, and the S pole 232b is arranged in the radial direction.

The resonance frequencies of the first and second permanent magnets 231 and 232 provided on the first and second cantilever 211 and 212 are configured to substantially match the frequency of the alternating magnetic field formed around the lead wire W. .. The resonance frequencies of the first cantilever 211, 211 and the first permanent magnet 231 are substantially the same as the resonance frequencies of the second cantilever 212, 212 and the second permanent magnet 232. Preferably, the dimensions, shape, and elastic modulus of the first cantilever 211,211 and the second cantilever 212,212 are substantially the same, and the dimensions and shape of the first permanent magnet 231 and the second permanent magnet 232 are substantially the same. Further, it is preferable that the mounting positions and postures of the first cantilever 211, 211 and the second cantilever 212, 212 with respect to the fixing portion 2 are symmetrical with respect to the plane passing through the center line of the lead wire W.

FIG. 5 is an operation explanatory view of the power generation device 200 according to the second embodiment of the present invention. According to the power generation device 200 according to the second embodiment, as shown in FIG. 5, the first permanent magnet 231 and the second permanent magnet 232 vibrate in the opposite directions in the circumferential direction of the lead wire W. The reaction force generated in the fixed portion 2 by the vibration of the first permanent magnet 231 and the reaction force generated in the fixed portion 2 by the vibration of the second permanent magnet 232 cancel each other out, and the center of gravity of the fixed portion 2 moves or the fixed portion 2 The force that rotates the magnet does not work. Therefore, the fixed portion 2 does not vibrate, and the vibration energy of the first permanent magnet 231 and the second permanent magnet 232 is not dissipated to the surroundings, and is converted into electric power by the piezoelectric members 211c and 212c without waste.

As described above, according to the power generation device 200 according to the second embodiment, the vibration energy of the first permanent magnet 231 and the second permanent magnet 232 is generated even when the power generation device 200 is attached to an unstable place such as a distribution line. It is possible to prevent the fixed portion 2 from radiating to the surroundings and efficiently convert the energy of the alternating magnetic field into electric power.

(Embodiment 3)
Since the configuration of the cantilever and the permanent magnet of the power generation device according to the third embodiment is different from that of the first embodiment, the above differences will be mainly described below. Since other configurations and actions and effects are the same as those in the first embodiment, the corresponding parts are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 6 is a perspective view of the power generation device 300 according to the third embodiment of the present invention. The power generation device 300 according to the third embodiment includes a first cantilever 311, a second cantilever 312, a third cantilever 313, a fourth cantilever 314, and a fixing portion 2. The fixing portion 2 has a through hole through which the lead wire W is inserted. The fixed portion 2 has a substantially symmetrical shape with respect to a plane orthogonal to the penetrating direction of the lead wire W. The fixed portion 2 has, for example, a substantially rectangular parallelepiped shape.

The first to fourth cantilever 311, 312, 313, and 314 are elongated plate-shaped elastic bodies, and have piezoelectric members 311c, 312c, 313c, and 314c, respectively. The shapes, materials, and the like of the first to fourth cantilever 311, 312, 313, and 314 are substantially the same as each other.

The fixed end 311a of the first cantilever 311 is fixed to the first corner portion of the first surface portion 2a where the through hole is formed, and holds the first cantilever 311 so as to be displaced in the non-diameter direction of the lead wire W. Specifically, the fixing portion 2 holds the first cantilever 311 so that the free end 311b of the first cantilever 311 is displaced or vibrates in the circumferential direction of the lead wire W. The circumferential direction means a direction orthogonal to the radial direction of the lead wire W and the longitudinal direction of the lead wire W, respectively.

Regarding the center line of the lead wire W, the fixed end 312a of the second cantilever 312 is fixed to the second corner portion that is point-symmetric with respect to the first corner portion, and the second cantilever is displaced in the non-diameter direction of the lead wire W. Holds 322. Specifically, the fixing portion 2 holds the second cantilever 312 so that the free end 312b of the second cantilever 312 displaces or vibrates in a direction substantially parallel to the free end 311b of the first cantilever 311.

The second surface portion 2b in which the through hole is formed is provided with the third cantilever 313 and the fourth cantilever 314 in the same positional relationship as the first cantilever 311 and the second cantilever 312. The second surface portion 2b is a surface substantially parallel to the first surface portion 2a. It is preferable that the first cantilever 311 and the second cantilever 312 when the first surface portion 2a side is viewed and the third cantilever 313 and the fourth cantilever 314 when the second surface portion 2b side is viewed have the same positional relationship. ..

The fixed end 313a of the third cantilever 313 is fixed to the first corner portion of the second surface portion 2b where the through hole is formed, and holds the third cantilever 313 so as to be displaced in the non-diameter direction of the lead wire W. Specifically, the fixing portion 2 holds the third cantilever 313 so that the free end 313b of the third cantilever 313 is displaced or vibrates in the circumferential direction of the lead wire W.

Regarding the center line of the lead wire W, the fixed end 314a of the fourth cantilever 314 is fixed to the second corner portion that is point-symmetric with respect to the first corner portion, and the fourth cantilever is displaced in the non-diameter direction of the lead wire W. Holds 314. Specifically, the fixing portion 2 holds the fourth cantilever 314 so that the free end 314b of the fourth cantilever 314 is displaced or vibrates in a direction substantially parallel to the free end 313b of the third cantilever 313.

The free ends 311b, 312b, 313b, and 314b of the first to fourth cantilever levers 311, 312, 313, and 314 have the first permanent magnet 331, the second permanent magnet 332, the third permanent magnet 333, and the fourth permanent magnet 344, respectively. It is provided.

The N pole 331a and the S pole 331b constituting the first permanent magnet 331 are arranged in the radial direction of the lead wire W. The N pole 331a is arranged on the outer side in the radial direction, and the S pole 331b is arranged on the inner side in the radial direction.
The N pole 332a and the S pole 332b constituting the second permanent magnet 332 are arranged in the radial direction of the lead wire W. The N pole 332a is arranged on the outer side in the radial direction, and the S pole 332b is arranged on the inner side in the radial direction.
It is preferable that the first permanent magnet 331 and the second permanent magnet 332 are point-symmetrical with respect to the center line of the lead wire W.

Similarly, the north pole 333a and the south pole 333b constituting the third permanent magnet 333 are arranged in the radial direction of the lead wire W. The N pole 333a is arranged on the inner side in the radial direction, and the S pole 333b is arranged on the outer side in the radial direction.
The N pole 334a and the S pole 334b constituting the fourth permanent magnet 334 are arranged in the radial direction of the lead wire W. The N pole 334a is arranged on the inner side in the radial direction, and the S pole 334b is arranged on the outer side in the radial direction.
It is preferable that the third permanent magnet 333 and the fourth permanent magnet 334 are point-symmetrical with respect to the center line direction of the lead wire W.

The electric power generated in the piezoelectric members 311c, 312c, 313c, and 314c due to the vibration of the first to fourth cantilever 311, 312, 313, and 314 is output from the output unit 4 similar to the first embodiment.

FIG. 7 is an operation explanatory view of the power generation device 300 according to the third embodiment of the present invention. According to the power generation device 300 according to the third embodiment, as shown in FIG. 7, the first permanent magnet 331 and the second permanent magnet 332 fluctuate in opposite directions, and torque is generated in the fixed portion 2. The direction of torque is the circumferential direction of the lead wire W. Similarly, the third permanent magnet 333 and the fourth permanent magnet 334 also fluctuate in opposite directions, and torque is generated in the fixed portion 2. The direction of the torque is also the circumferential direction of the lead wire W and the direction opposite to the direction of the torque generated by the vibration of the first permanent magnet 331 and the second permanent magnet 332. Therefore, the torque generated in the fixed portion 2 by the first to fourth permanent magnets 331, 332, 333, and 334 is canceled, and the force for moving the center of gravity of the fixed portion 2 or rotating the fixed portion 2 does not work. Therefore, the fixed portion 2 does not vibrate, the vibration energy of the first to fourth permanent magnets 331, 332, 333, and 334 is not dissipated to the surroundings, and the piezoelectric members 311c, 312c, 313c, and 314c generate electric power without waste. Will be converted.

As described above, according to the power generation device 300 according to the third embodiment, even when the power generation device 300 is attached to an unstable place such as a distribution line, the first to fourth permanent magnets 331, 332, 333, 334 It is possible to prevent the vibration energy from being dissipated from the fixed portion 2 to the surroundings, and to efficiently convert the energy of the alternating magnetic field into electric power.

(Embodiment 4)
FIG. 8 is a block diagram showing a current detection device according to the fourth embodiment. The current detection device according to the fourth embodiment includes a current sensor 405 that detects the current flowing through the lead wire W, and a transmission device 406 that wirelessly transmits the detection information detected by the current sensor 405 to the outside.

The transmission device 406 according to the fourth embodiment is driven by the power generation device 100 according to the first embodiment and the electric power output by the power generation device 100, and wirelessly transmits a signal related to the detection information detected by the current sensor 405. A unit 461 is provided. The power generation device 100 generates power based on an alternating magnetic field formed around the lead wire W, outputs a voltage to the transmission unit 461, and the transmission unit 461 is driven by the voltage output from the power generation device 100.

According to the current detection device according to the fourth embodiment, the transmission unit 461 can be driven by using the voltage output by the power generation device 100. Therefore, in an environment where a power source cannot be prepared, for example, the power generation device 100 and the transmission unit 461 are arranged on the side of the current sensor 405 provided in the middle of the transmission line, and the detection information such as the current value is wirelessly transmitted to the outside. be able to.

In the fourth embodiment, an example including the power generation device 100 according to the first embodiment has been described, but it goes without saying that the power generation device 200 according to the second embodiment or the power generation device 300 according to the third embodiment is used. The current detection device according to the fourth embodiment may be configured.
Further, although the first and second cantilever 11 and 12 have been exemplified as a configuration for displaceably supporting the first and second permanent magnets 31 and 32, the first and second permanent magnets 31 and 32 can be moved by a vibrating magnetic field. In the case of the configuration, the support mechanism is not particularly limited to the first and second cantilever 11, 12.

The embodiments disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

100, 200 power generator, 11 1st cantilever, 12 2nd cantilever, 11a, 12a fixed end, 11b, 12b free end, 2 fixed part, 31st permanent magnet, 32nd second permanent magnet, 4 output part, W lead wire

Claims (7)

The first elastic body and the second elastic body,
A fixing portion for fixing the first portion of the first elastic body and the first portion of the second elastic body in a displaceable manner with respect to a conducting wire through which alternating current flows.
The first permanent magnet provided in the second part of the first elastic body and
A second permanent magnet provided at the second portion of the second elastic body, and
When the first permanent magnet and the second permanent magnet vibrate due to an alternating magnetic field formed around the conducting wire, a conversion unit that converts the vibration energy of the first permanent magnet and the second permanent magnet into electrical energy is provided. Prepare,
The first permanent magnet and the second permanent magnet are
A power generation device provided at a position and orientation in which the reaction force generated in the fixed portion by the vibration of the first permanent magnet and the reaction force generated in the fixed portion by the vibration of the second permanent magnet cancel each other out. The arrangement direction of the north pole and the south pole constituting the first permanent magnet is the circumferential direction of the conducting wire.
The arrangement direction of the north pole and the south pole constituting the second permanent magnet is opposite to the arrangement direction of the north pole and the south pole constituting the first permanent magnet.
The power generation device according to claim 1, wherein the first permanent magnet and the second permanent magnet are provided at positions opposite to each other with the lead wire interposed therebetween. The first permanent magnet and the second permanent magnet form an annular shape surrounding the conducting wire.
The arrangement direction of the north pole and the south pole constituting the first permanent magnet is the radial direction of the conducting wire.
The arrangement direction of the north pole and the south pole constituting the second permanent magnet is opposite to the arrangement direction of the north pole and the south pole constituting the first permanent magnet.
The power generation device according to claim 1, wherein the first permanent magnet and the second permanent magnet are provided at positions opposite to each other with the fixed portion interposed therebetween. The invention according to any one of claims 1 to 3, wherein the resonance frequencies of the first permanent magnet and the first elastic body are substantially the same as the resonance frequencies of the second permanent magnet and the second elastic body. Power generator. The first elastic body and the second elastic body are cantilever,
The power generation device according to any one of claims 1 to 4, wherein the conversion unit is a piezoelectric member provided on the cantilever. A first elastic body, a second elastic body, a third elastic body, a fourth elastic body, and
A fixing portion for fixing the first elastic body, the second elastic body, the third elastic body, and the first portion of the fourth elastic body in a displaceable manner with respect to a conducting wire through which alternating current flows.
The first permanent magnet provided in the second part of the first elastic body and
A second permanent magnet provided at the second portion of the second elastic body, and
A third permanent magnet provided at the second portion of the third elastic body, and
A fourth permanent magnet provided at the second portion of the fourth elastic body, and
When the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet vibrate due to an alternating magnetic field formed around the conducting wire, the first permanent magnet, the second permanent magnet, and the like. It is provided with a conversion unit that converts the vibration energy of the third permanent magnet and the fourth permanent magnet into electrical energy.
The first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet are
A power generation device provided at a position and orientation in which reaction forces generated in the fixed portion due to vibrations of the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet cancel each other out. The power generation device according to any one of claims 1 to 6.
Equipped with a transmitter that transmits signals
The transmitter
A transmission device driven by a voltage output from the power generation device.

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