JP7361300B2 - Power generator and transmitter - Google Patents

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 transmitter equipped with the power generation device.

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

JP2019-22366A

However, there is a problem in that the vibration of the permanent magnet causes the fixed part that supports the elastic body to also vibrate, resulting in a decrease in power generation efficiency. In a system that generates electricity by applying the vibrations of a permanent magnet to an elastic piezoelectric member, when the fixed part is completely stationary, all of the vibration energy is transmitted to the piezoelectric member, and the power generation is maximized. However, if the fixed part is attached to an unstable object such as a power distribution line, the fixed part will also vibrate due to vibrations transmitted through the elastic body, making it impossible to obtain maximum power generation.

The purpose of the present invention is to prevent the vibration energy of a permanent magnet from dissipating from the fixed part to the surroundings even when installed in an unstable location such as a power distribution line, and to efficiently convert the energy of an alternating magnetic field into electricity. The object of the present invention is to provide a power generating device and a transmitting device that can be converted into a power generating device and a transmitting device.

In the power generation device according to the present invention, a first elastic body, a second elastic body, a first portion of the first elastic body, and a first portion of the second elastic body are displaceable with respect to a conductor through which alternating current flows. A fixing part to be fixed, a first permanent magnet provided in a second part of the first elastic body, a second permanent magnet provided in a second part of the second elastic body, and formed around the conductive wire. a conversion unit that converts the vibrational energy of the first permanent magnet and the second permanent magnet into electrical energy when the first permanent magnet and the second permanent magnet vibrate due to an alternating current magnetic field; The magnet and the second permanent magnet are positioned and in a posture such that the reaction force generated on the fixed part due to the vibration of the first permanent magnet and the reaction force generated on the fixed part due to the vibration of the second permanent magnet cancel each other out. It is set in.

In the present invention, the first permanent magnet and the second permanent magnet are vibrated by the alternating current magnetic field formed around the conducting wire. The converter converts the vibrational 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 electricity using the alternating current magnetic field as an energy source even if the frequency of the alternating magnetic field is as low as on the order of 10 Hz.
In addition, in order to prevent the vibration of the first permanent magnet and the second permanent magnet from being transmitted to the fixed part and causing the fixed part to vibrate, the power generation device according to the present invention includes a pair of permanent magnets, that is, a first permanent magnet. The magnet includes a first permanent magnet and a second permanent magnet. Further, the reaction force generated on the fixed part due to the vibration of the first permanent magnet and the reaction force generated on the fixed part due to the vibration of the second permanent magnet cancel each other out, so that the center of gravity of the fixed part does not move.
Therefore, the vibration energy of the first and second permanent magnets can be prevented from dissipating from the fixed part to the surroundings, and the conversion part 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 current magnetic field into electric power.

In the power generation device according to the present invention, the arrangement direction of the N-poles and S-poles constituting the first permanent magnet is the circumferential direction of the conducting wire, and the arrangement direction of the N-poles and S-poles constituting the second permanent magnet is , the direction is opposite to the arrangement direction of the N and S poles constituting the first permanent magnet, and the first permanent magnet and the second permanent magnet are provided at positions opposite to each other with the conducting wire in between. .

In the present invention, the first and second permanent magnets are located on opposite sides of the conductive wire. The first and second permanent magnets vibrate in the radial direction of the conducting wire, and the vibration directions are opposite to each other.
Therefore, the reaction forces generated on the fixed part due to the vibrations of the first and second permanent magnets cancel each other out, and the center of gravity of the fixed part does not move.

In the power generation device according to the present invention, the first permanent magnet and the second permanent magnet have an annular shape surrounding a conductive wire, and the arrangement direction of the N pole and S pole constituting the first permanent magnet is determined by the diameter of the conductive wire. The direction in which the N and S poles constituting the second permanent magnet are arranged is opposite to the direction in which the N and S poles constituting the first permanent magnet are arranged. 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 vibration directions are opposite to each other.
Therefore, the reaction forces generated on the fixed part due to the vibrations of the first and second permanent magnets cancel each other out, and the center of gravity of the fixed part does not move.

In the power generation device according to the present invention, the resonance frequency of the first permanent magnet and the first elastic body is substantially the same as the resonance frequency 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, it is possible to balance the magnitudes of vibrations of the first and second permanent magnets.
Therefore, the reaction force generated on the fixed part due to the vibration of the first and second permanent magnets can be reliably offset.

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

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

The power generation device according to the present invention includes a first elastic body, a second elastic body, a third elastic body, a fourth elastic body, the first elastic body, the second elastic body, the third elastic body, and the fourth elastic body. a fixing part that fixes a first part of the elastic body so as to be displaceable with respect to a conductor through which alternating current flows; a first permanent magnet provided in a second part of the first elastic body; and a first permanent magnet of the second elastic body. a second permanent magnet provided at two locations, a third permanent magnet provided at the second location of the third elastic body, and a fourth permanent magnet provided at the second location 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 current magnetic field formed around the conducting wire, the first permanent magnet, the second permanent magnet, a conversion unit that converts the vibrational 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 , the first permanent magnet, the second permanent magnet, the third permanent magnet, and the fourth permanent magnet are provided in a position and orientation such that reaction forces generated on the fixed part due to vibrations cancel each other out.

In the present invention, the vibration energy of the first to fourth permanent magnets can be prevented from dissipating from the fixed part to the surroundings, and the conversion part 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 current magnetic field into electric power.

A transmitting device according to the present invention includes any one of the power generating devices described above and a transmitting section that transmits a signal, and the transmitting section is driven by a voltage output from the power generating device.

In the present invention, the transmitter can be driven using the power generated by the power generator. Therefore, even in an environment where a power supply is not available, it is possible to transmit a signal from the transmitter.

According to the present invention, even if the permanent magnet is installed in an unstable location such as a power distribution line, the vibration energy of the permanent magnet is prevented from dissipating from the fixed part to the surroundings, and the energy of the alternating magnetic field is efficiently used to generate electricity. can be converted to .

1 is a perspective view of a power generation device according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram of the operation of the power generation device according to Embodiment 1 of the present invention. FIG. 3 is an explanatory diagram of the operation of a power generation device according to a comparative example. FIG. 2 is a perspective view of a power generation device according to Embodiment 2 of the present invention. FIG. 7 is an explanatory diagram of the operation of the power generation device according to Embodiment 2 of the present invention. FIG. 7 is an explanatory diagram of the operation of the power generation device according to Embodiment 3 of the present invention. FIG. 7 is an explanatory diagram of the operation of the power generation device according to Embodiment 3 of the present invention. FIG. 7 is a block diagram showing a current detection device according to a fourth embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a perspective view of a power generation device 100 according to Embodiment 1 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, the first cantilever 11 and the second cantilever 12 as an elastic body having a piezoelectric member 12c. A fixed part 2 fixes the fixed ends 11a, 12a (first part) of the cantilever 12 in a movable manner with respect to a conductor W through which a low-frequency alternating current of the order of 10 Hz flows, and a free end 11b (first part) of the first cantilever 11. the first permanent magnet 31 provided at the free end 12b (second location) of the second cantilever 12; the piezoelectric member of the first cantilever 11 and the second cantilever 12; The output unit 4 outputs the voltage generated at the terminals 11c and 12c. In the first embodiment, the conductive wire W is a linear member formed of a material with a substantially circular cross section through which current can flow, and the conductive wire W is connected to a 50 Hz or 60 Hz grid power source. do. The power generation device 100 converts an alternating current magnetic field formed around the conducting wire W into kinetic energy of the first and second permanent magnets 31 and 32, and converts the kinetic energy of the first and second permanent magnets 31 and 32 into the piezoelectric member 11c. , 12c to generate electricity.
Note that the configuration of the conducting wire W is an example, and its shape is not particularly limited as long as it is configured to flow a current that can form an alternating magnetic field that vibrates the first and second permanent magnets 31 and 32. 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 conducting wire W may partially have a non-linear portion such as a rectangular plate shape, and the shape as a whole may be such that an alternating current flows in a predetermined direction. The present invention also includes a configuration in which the power generation device 100 is fixed to the non-linear portion. Furthermore, the conducting wire W does not necessarily have to be straight, and may be partially curved. Furthermore, the conducting wire W is not limited to a specific purpose, and may be a ground wire. Embodiment 1 will be described below on the assumption that the conducting wire W is a linear member.

The first cantilever 11 and the second cantilever 12 are power generation members using, for example, bimorph piezoelectric elements. Since the first and second cantilevers 11 and 12 have similar configurations, 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 external force, and two plate-like or sheet-like piezoelectric members 11c polarized in the thickness direction. It is bonded to both sides of the long plate part so as to sandwich the long plate part. It is sufficient that the length of the piezoelectric member 11c in the longitudinal direction is about 2/3 of the length of the portion of the long plate portion that protrudes from the fixing portion 2. Further, each of the two piezoelectric members 11c is provided with a sheet-like electrode. The member constituting the long plate portion is, for example, metal such as stainless steel. The piezoelectric member 11c is, for example, piezoelectric ceramic. One end in the longitudinal direction of the long plate part is a fixed end 11a fixed to the fixed part 2, and the other end in the longitudinal direction of the long plate part is a free end 11b that can be displaced by 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.
Note that although a bimorph type piezoelectric element has been described here, a unimorph structure in which the piezoelectric member 11c is attached only to one side may be used. The piezoelectric member 11c is an example of a converter that converts the vibrational energy of the first permanent magnet 31 vibrated by the alternating current magnetic field formed around the conducting wire W into electrical energy.

The fixing part 2 is a member that fixes the fixed ends 11a and 12a of the first cantilever 11 and the second cantilever 12 to the conducting wire W. The fixing portion 2 has a substantially rectangular parallelepiped shape, for example, and has a through hole through which the conductive wire W is inserted. The through hole has a circular shape in front view passing through the center. A fixed end 11a of the first cantilever 11 is fixed to one side of one surface of the fixed part 2 in which a through hole is formed, and holds the first cantilever 11. A fixed end 12a of the second cantilever 12 is fixed to the other side opposite to the one side on one side of the fixed part 2, and holds the second cantilever 12. More specifically, the fixing part 2 fixes 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 vibrated in the radial direction of the conducting 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 with the arrangement direction of the north pole 31a and the south pole 31b facing the circumferential direction of the conducting wire W. Further, the second permanent magnet 32 has a rectangular plate shape, and is in a posture such that the arrangement direction of the N pole 32a and the S pole 32b is opposite to the arrangement direction of the N pole 31a and the S pole 31b forming the first permanent magnet 31. It is adhesively fixed to the free end 12b of the second cantilever 12.
The resonant frequencies of the first and second permanent magnets 31 and 32 provided in the first and second cantilevers 11 and 12 are configured to substantially match the frequency of the alternating current magnetic field formed around the conducting wire W. . Needless to say, the resonant frequency is the resonant frequency of the vibrating part including the first cantilever 11 and the first permanent magnet 31, and the resonant frequency of the vibrating part including the second cantilever 12 and the second permanent magnet 32. Hereinafter, the resonant frequency of the first permanent magnet 31 and the resonant frequency of the second permanent magnet 32 are assumed to be resonant 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 current magnetic field is 60 Hz, the resonance frequency of the first and second permanent magnets 31 and 32 is 50 Hz. Let the resonance frequency be 60Hz. Note that the resonant frequency substantially matching 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 resonant frequency is shifted from the frequency of the alternating magnetic field within a range where the required power can be obtained. means.

The first and second permanent magnets 31 and 32 have dimensions such that each part receives 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 such that each part receives magnetic force in the same direction at any vibration position.

Further, the resonance frequency of the first cantilever 11 and the first permanent magnet 31 is substantially the same as the resonance frequency of the second cantilever 12 and the second permanent magnet 32. Preferably, the first cantilever 11 and the second cantilever 12 have substantially the same size, shape, and elastic modulus, and the first permanent magnet 31 and the second permanent magnet 32 have substantially the same size and shape. Further, it is preferable that the mounting positions and postures of the first cantilever 11 and the second cantilever 12 with respect to the fixed part 2 are symmetrical with respect to a plane passing through the center line of the conducting wire W.

The output section 4 is connected to the electrodes of the first cantilever 11 and the second cantilever 12 and the long plate section, and outputs the voltage generated in the piezoelectric member 11c expanded and contracted by the vibrations of the first and second permanent magnets 31 and 32. This is a circuit that outputs . The output section 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, 12c and the long plate part, 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 a rectifier circuit, and converted into a predetermined voltage by a DC-DC converter. The DC voltage converted into a predetermined voltage by the DC-DC converter is applied to an external load R.

FIG. 2 is an explanatory diagram of the operation of the power generation device 100 according to the first embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of the power generation device 10 according to the comparative example. In order to show the effects of the power generation device 100 according to the first embodiment, a power generation device 10 according to a comparative example is shown in FIG. The power generation device 10 according to the comparative example includes the first cantilever 11, the first permanent magnet 31, the fixed part 2, and the output part 4, which are similar to the power generation device 100 according to the first embodiment, and is different from the power generation device 100 according to the first embodiment. This configuration does not include the second cantilever 12 and the second permanent magnet 32.

When the power generation device 10 is attached to a conducting wire W such as a distribution line through which alternating current flows, the first permanent magnet 31 starts to vibrate due to the alternating current 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 part 2, as shown by the dashed arrow in FIG. Due to the reaction generated in the fixed part 2 due to the vibration, the fixed part 2 also vibrates. When the fixed part 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 this problem, the power generation device 100 according to the first embodiment includes a second cantilever 12 and a second permanent magnet 32 that form a pair 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 opposite directions in the radial direction of the conducting wire W. The reaction force generated on the fixed part 2 due to the vibration of the first permanent magnet 31 and the reaction force generated on the fixed part 2 due to the vibration of the second permanent magnet 32 cancel each other out, causing the center of gravity of the fixed part 2 to move or There is no force to rotate it. Therefore, the fixed part 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 without waste by the piezoelectric members 11c and 12c.

As described above, according to the power generation device 100 according to the first embodiment, even when installed in an unstable location such as a power distribution line, the vibration energy of the first permanent magnet 31 and the second permanent magnet 32 is Dissipation from the fixed part 2 to the surroundings can be prevented, and the energy of the alternating current magnetic field can be efficiently converted into electric power.

Furthermore, 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 at substantially the same period. Therefore, the reaction force generated on the fixed part 2 due to the vibrations of the first and second permanent magnets 31 and 32 can be reliably offset, and power can be efficiently generated.

In the first embodiment, an example has been described in which the fixed part 2 includes a pair of first and second cantilevers 11 and 12 and first and second permanent magnets 31 and 32. It may also include a second cantilever and first and second permanent magnets. Specifically, a pair of first and second cantilevers 11 and 12 and first and second permanent magnets 31 and 32 are provided on one side of the fixing part 2 having the through hole (the right side in FIG. 1), and the fixed part 2 is fixed. It is preferable to provide another pair of first and second cantilevers and first and second permanent magnets on the other side of the portion 2 having the through hole (the left side in FIG. 1). The stability of the fixed part 2 is further improved.
Furthermore, two pairs of first and second cantilevers and first and second permanent magnets may be provided on one side of the fixed portion 2 having the through hole (the right side in FIG. 1).

In addition, in the first embodiment, the piezoelectric members 11c and 12c were described as an example of the conversion unit that converts the vibrational energy of the first permanent magnet 31 and the second permanent magnet 32 into electrical energy, but the specific configuration of the conversion unit is 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 vibrational energy of the first permanent magnet 31 into electrical energy includes a first electrode substrate having a plurality of electrets, and a conductive second electrode having a plurality of counter electrodes facing each of the plurality of electrets. and a substrate. Electrets are charged bodies that store electric charge. Electrets semi-permanently hold a charge and form an electric field. The first electrode substrate is fixed to the first permanent magnet 31 in such a posture that the plurality of electrets are lined up in the vibration direction of the first permanent magnet 31.

The second electrode substrate is fixed so that its position with respect to the conducting wire W does not change, with the plurality of opposing electrodes facing each of the plurality of electrets. For example, the second electrode substrate is fixed to the fixing part 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 current magnetic field formed around the conducting wire W. When the first permanent magnet 31 vibrates, the relative position between the electret and the opposing electrode changes, and the charges move. In this way, the electret generator can convert the vibrational energy of the first permanent magnet 31 into electrical energy, and the voltage generated by the movement of charges is output from the output section 4.

It is preferable to provide a similar electret generator to the second permanent magnet 32 as well.
Further, as the converter, a known generator capable of converting the vibrational 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 power generation device according to the second embodiment differs from the first embodiment in the configurations of the first and second cantilevers and the first and second permanent magnets, the above-mentioned differences will be mainly explained below. Since the other configurations and effects are the same as those of the first embodiment, corresponding parts are given the same reference numerals and detailed explanations are omitted.

FIG. 4 is a perspective view of a power generation device 200 according to Embodiment 2 of the present invention. The power generation device 200 according to the second embodiment includes a first annular permanent magnet 231 coaxially disposed with respect to the conducting wire W.
The first permanent magnet 231 is supported by the fixed part 2 by two first cantilevers 211, 211 so that its center line substantially coincides with the center line of the conducting wire W. The first cantilevers 211, 211 have piezoelectric members 211c, 211c, respectively. The N poles 231a and S poles 231b constituting the first permanent magnet 231 are arranged in the thickness direction, that is, in the radial direction of the conducting wire W. The north pole 231a is arranged on the outside in the radial direction, and the south pole 231b is arranged on the inside in the radial direction.

The power generation device 200 according to the second embodiment further includes a second permanent magnet 232 having an annular shape similar to the first permanent magnet 231 and arranged coaxially with respect to the conducting wire W. The second permanent magnet 232 is supported by the fixed part 2 by two second cantilevers 212, 212 so that its center line substantially coincides with the center line of the conducting wire W. The second permanent magnet 232 is arranged on the opposite side of the first permanent magnet 231 with the fixed part 2 interposed therebetween. The second cantilevers 212, 212 have piezoelectric members 212c, 212c, respectively. The arrangement direction of the N pole 232a and the S pole 232b forming the second permanent magnet 232 is opposite to the arrangement direction of the N pole 231a and the S pole 231b forming the first permanent magnet 231. The north pole 231a is arranged on the inside in the radial direction, and the south pole 232b is arranged on the inside in the radial direction.

The resonant frequencies of the first and second permanent magnets 231 and 232 provided in the first and second cantilevers 211 and 212 are configured to approximately match the frequency of the alternating current magnetic field formed around the conducting wire W. . The resonance frequency of the first cantilevers 211, 211 and the first permanent magnet 231 is substantially the same as the resonance frequency of the second cantilevers 212, 212 and the second permanent magnet 232. Preferably, the dimensions, shapes, and elastic modulus of the first cantilevers 211, 211 and the second cantilevers 212, 212 are substantially the same, and the dimensions, shapes, and shapes of the first permanent magnets 231 and the second permanent magnets 232 are substantially the same. Further, the attachment positions and postures of the first cantilevers 211, 211 and the second cantilevers 212, 212 with respect to the fixed part 2 are preferably configured to be symmetrical with respect to a plane passing through the center line of the conducting wire W.

FIG. 5 is an explanatory diagram of the operation 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 opposite directions in the circumferential direction of the conducting wire W. The reaction force generated on the fixed part 2 due to the vibration of the first permanent magnet 231 and the reaction force generated on the fixed part 2 due to the vibration of the second permanent magnet 232 cancel each other out, causing the center of gravity of the fixed part 2 to move or There is no force to rotate it. Therefore, the fixed part 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 without waste by the piezoelectric members 211c and 212c.

As described above, according to the power generation device 200 according to the second embodiment, even when installed in an unstable location such as a power distribution line, the vibration energy of the first permanent magnet 231 and the second permanent magnet 232 is Dissipation from the fixed part 2 to the surroundings can be prevented, and the energy of the alternating current magnetic field can be efficiently converted into electric power.

(Embodiment 3)
Since the power generation device according to the third embodiment differs from the first embodiment in the configurations of the cantilever and the permanent magnet, the above-mentioned differences will be mainly explained below. Since the other configurations and effects are the same as those of the first embodiment, corresponding parts are given the same reference numerals and detailed explanations are omitted.

FIG. 6 is a perspective view of a power generation device 300 according to Embodiment 3 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 part 2 . The fixing part 2 has a through hole through which the conducting wire W is inserted. Note that the fixing portion 2 is approximately symmetrical with respect to a plane perpendicular to the direction in which the conducting wire W passes through. The fixing portion 2 has, for example, a substantially rectangular parallelepiped shape.

The first to fourth cantilevers 311, 312, 313, and 314 are long plate-shaped elastic bodies, and have piezoelectric members 311c, 312c, 313c, and 314c, respectively. The shapes, materials, and other configurations of the first to fourth cantilevers 311, 312, 313, and 314 are substantially the same.

A fixed end 311a of the first cantilever 311 is fixed to the first corner portion of the first surface portion 2a in which the through hole is formed, and the first cantilever 311 is held so as to be displaced in a non-radial direction of the conducting wire W. Specifically, the fixing part 2 holds the first cantilever 311 so that the free end 311b of the first cantilever 311 is displaced or vibrated in the circumferential direction of the conductive wire W. The circumferential direction means a direction perpendicular to the radial direction of the conducting wire W and the longitudinal direction of the conducting wire W, respectively.

A fixed end 312a of the second cantilever 312 is fixed to a second corner portion that is point symmetrical to the first corner portion with respect to the center line of the conducting wire W. It holds 322. Specifically, the fixed part 2 holds the second cantilever 312 so that the free end 312b of the second cantilever 312 is displaced or vibrated in a direction substantially parallel to the free end 311b of the first cantilever 311.

A third cantilever 313 and a fourth cantilever 314 are provided on the second surface portion 2b in which the through hole is formed 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 looking at the first surface section 2a side have the same positional relationship as the third cantilever 313 and the fourth cantilever 314 when looking at the second surface section 2b side. .

A fixed end 313a of a third cantilever 313 is fixed to the first corner portion of the second surface portion 2b in which the through hole is formed, and the third cantilever 313 is held so as to be displaced in a non-radial direction of the conducting wire W. Specifically, the fixed part 2 holds the third cantilever 313 so that the free end 313b of the third cantilever 313 is displaced or vibrated in the circumferential direction of the conductive wire W.

A fixed end 314a of the fourth cantilever 314 is fixed to a second corner portion which is point symmetrical with respect to the first corner portion with respect to the center line of the conducting wire W. It holds 314. Specifically, the fixed part 2 holds the fourth cantilever 314 so that the free end 314b of the fourth cantilever 314 is displaced or vibrated in a direction substantially parallel to the free end 313b of the third cantilever 313.

A first permanent magnet 331, a second permanent magnet 332, a third permanent magnet 333, and a fourth permanent magnet 344 are attached to the free ends 311b, 312b, 313b, and 314b of the first to fourth cantilevers 311, 312, 313, and 314, respectively. It is provided.

The N pole 331a and the S pole 331b that constitute the first permanent magnet 331 are arranged in the radial direction of the conducting wire W. The north pole 331a is arranged on the outside in the radial direction, and the south pole 331b is arranged on the inside in the radial direction.
N poles 332a and S poles 332b constituting the second permanent magnet 332 are arranged in the radial direction of the conducting wire W. The north pole 332a is arranged on the outside in the radial direction, and the south pole 332b is arranged on the inside in the radial direction.
The first permanent magnet 331 and the second permanent magnet 332 are preferably configured to be point symmetrical with respect to the center line of the conducting wire W.

Similarly, the N pole 333a and the S pole 333b constituting the third permanent magnet 333 are arranged in the radial direction of the conducting wire W. The north pole 333a is arranged on the inside in the radial direction, and the south pole 333b is arranged on the outside in the radial direction.
The north pole 334a and the south pole 334b constituting the fourth permanent magnet 334 are arranged in the radial direction of the conducting wire W. The north pole 334a is arranged on the radially inner side, and the south pole 334b is arranged on the radially outer side.
The third permanent magnet 333 and the fourth permanent magnet 334 are preferably configured to be point symmetrical with respect to the direction of the center line of the conducting wire W.

The electric power generated in the piezoelectric members 311c, 312c, 313c, and 314c due to the vibrations of the first to fourth cantilevers 311, 312, 313, and 314 is outputted from the output section 4 similar to the first embodiment.

FIG. 7 is an explanatory diagram of the operation 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 move in opposite directions, and torque is generated in the fixed part 2. The direction of the torque is the circumferential direction of the conducting wire W. Similarly, the third permanent magnet 333 and the fourth permanent magnet 334 also move in opposite directions, and torque is generated in the fixed part 2. The direction of the torque is also in the circumferential direction of the conducting wire W, and is opposite to the direction of the torque generated by the vibrations of the first permanent magnet 331 and the second permanent magnet 332. Therefore, the torques generated on the fixed part 2 by the first to fourth permanent magnets 331, 332, 333, and 334 are canceled out, and no force is exerted to move the center of gravity of the fixed part 2 or to rotate the fixed part 2. Therefore, the fixed part 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 are used to generate electricity without waste. converted.

As described above, according to the power generation device 300 according to the third embodiment, even when installed in an unstable location such as a power distribution line, the first to fourth permanent magnets 331, 332, 333, and 334 It is possible to prevent vibration energy from dissipating from the fixed part 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 conductor W, and a transmitting device 406 that wirelessly transmits detection information detected by the current sensor 405 to the outside.

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

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

In addition, in Embodiment 4, an example including the power generation device 100 according to Embodiment 1 has been described, but it goes without saying that the power generation device 200 according to Embodiment 2 or the power generation device 300 according to Embodiment 3 can be used. A current detection device according to the fourth embodiment may be configured.
Furthermore, although the first and second cantilevers 11 and 12 are illustrated as a structure that displaceably supports the first and second permanent magnets 31 and 32, the first and second permanent magnets 31 and 32 can be moved by the oscillating magnetic field. The support mechanism is not particularly limited to the first and second cantilevers 11 and 12 as long as the structure is the same.

The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the claims rather than the above-mentioned meaning, and is intended to include meanings equivalent to the claims and all changes within the scope.

100, 200 power generator, 11 first cantilever, 12 second cantilever, 11a, 12a fixed end, 11b, 12b free end, 2 fixed part, 31 first permanent magnet, 32 second permanent magnet, 4 output part, W conductor

Claims (6)

a first elastic body and a second elastic body;
a fixing part that fixes a first part of the first elastic body and a first part of the second elastic body so that they can be displaced with respect to a conductor through which alternating current flows;
a first permanent magnet provided at a second portion of the first elastic body;
a second permanent magnet provided at a second portion of the second elastic body;
a conversion unit that converts the vibrational energy of the first permanent magnet and the second permanent magnet into electrical energy when the first permanent magnet and the second permanent magnet vibrate due to an alternating current magnetic field formed around the conductor; Prepare,
The arrangement direction of the N pole and S pole constituting the first permanent magnet is the circumferential direction of the conducting wire,
The arrangement direction of the N poles and S poles forming the second permanent magnet is opposite to the arrangement direction of the N poles and S poles forming the first permanent magnet,
The first permanent magnet and the second permanent magnet are
at positions opposite to each other across the conductor so that the reaction force generated on the fixed part due to the vibration of the first permanent magnet and the reaction force generated on the fixed part due to the vibration of the second permanent magnet cancel each other out. A power generation device is installed. a first elastic body and a second elastic body;
a fixing part that fixes a first part of the first elastic body and a first part of the second elastic body so that they can be displaced with respect to a conductor through which alternating current flows;
a first permanent magnet provided at a second portion of the first elastic body;
a second permanent magnet provided at a second portion of the second elastic body;
a conversion unit that converts the vibrational energy of the first permanent magnet and the second permanent magnet into electrical energy when the first permanent magnet and the second permanent magnet vibrate due to an alternating current magnetic field formed around the conductor; Prepare,
The first permanent magnet and the second permanent magnet have an annular shape surrounding a conductive wire,
The arrangement direction of the N pole and S pole constituting the first permanent magnet is the radial direction of the conducting wire,
The arrangement direction of the N poles and S poles forming the second permanent magnet is opposite to the arrangement direction of the N poles and S poles forming the first permanent magnet,
The first permanent magnet and the second permanent magnet are
so that the reaction force generated on the fixed part due to the vibration of the first permanent magnet and the reaction force generated on the fixed part due to the vibration of the second permanent magnet cancel each other out. A power generation device installed at the location . The power generation device according to claim 1 or 2 , wherein a resonance frequency of the first permanent magnet and the first elastic body is substantially the same as a resonance frequency of the second permanent magnet and the second elastic body. The first elastic body and the second elastic body are cantilevers,
The power generation device according to any one of claims 1 to 3, wherein the conversion section is a piezoelectric member provided on the cantilever. A first elastic body, a second elastic body, a third elastic body, and a fourth elastic body,
a fixing part that fixes first portions of the first elastic body, the second elastic body, the third elastic body, and the fourth elastic body so as to be displaceable with respect to a conductor through which alternating current flows;
a first permanent magnet provided at a second portion of the first elastic body;
a second permanent magnet provided at a second portion of the second elastic body;
a third permanent magnet provided at a second portion of the third elastic body;
a fourth permanent magnet provided in a second portion 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 current magnetic field formed around the conducting wire, the first permanent magnet, the second permanent magnet, a conversion unit that converts the vibrational 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 in a position and attitude such that reaction forces generated on the fixed part 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 5 ,
comprising a transmitting section that transmits a signal, and
The transmitter includes:
A transmitting device driven by the voltage output from the power generating device.

Images