JP2020156285A - Power generator and transmitter - Google Patents

Abstract

To provide a power generator that can generate power by using an AC magnetic field of a low frequency in the order of ten Hz formed around a conductor wire and is applicable to a wide range of current.SOLUTION: A power generator 100 includes: a permanent magnet 3 provided to be displaceable with respect to a conductor wire W through which AC flows; a cantilever 1 that converts vibration energy of the permanent magnet 3 into electric energy when the permanent magnet 3 vibrates by an AC magnetic field formed around the conductor wire W; and a magnet 5 that limits the amplitude of the permanent magnet 3 by magnetic force.SELECTED DRAWING: Figure 1

Description

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

Patent Document 1 describes a cantilever as an elastic body having a piezoelectric element, a fixing portion for fixing one end of the cantilever to a conducting wire through which an alternating magnetic field flows, a permanent magnet provided at the other end of the cantilever, and around the conducting wire. A power generation device that converts the kinetic energy of a permanent magnet that vibrates by an alternating magnetic field formed into electrical energy by a piezoelectric element and outputs it is disclosed. The power generation device of Patent Document 1 can generate power based on the alternating magnetic field even if the frequency of the alternating magnetic field formed around the conducting wire is as low as 10 Hz.

Japanese Unexamined Patent Publication No. 2019-22366

However, in the power generation device according to Patent Document 1, when the alternating current increases, the generated magnetic field also increases, and the force acting on the permanent magnet also increases. Then, the stress applied to the piezoelectric element becomes large, and the piezoelectric element may be damaged. Therefore, there is a problem that the power generation device cannot be applied to a conducting wire having an excessively large alternating current. Further, it is conceivable to adjust the elasticity of the piezoelectric element and the cantilever so that the swing width of the permanent magnet with respect to the magnetic field becomes small, but there is a problem that the amount of power generation becomes small when arranged in a conducting wire having a small alternating current.
As described above, the power generation device according to Patent Document 1 has a technical problem that it is difficult to increase the current range of the applicable lead wire.
Even when another power generation mechanism that converts the kinetic energy of the permanent magnet into electrical energy is used, the movable range of the permanent magnet should be limited to a certain range, and when the permanent magnet vibrates significantly, power is generated. The mechanism may be damaged. Therefore, the same problem as described above occurs.

An object of the present invention is a power generation device capable of generating power using a low-frequency alternating magnetic field of the order of 10 Hz formed around a conducting wire, and a power generation device applicable to a wide current range, and a transmission device provided with the power generation device. Is to provide.

The power generation device according to this embodiment has a permanent magnet displaceable with respect to a conducting wire through which alternating current flows, and when the permanent magnet vibrates due to an alternating magnetic field formed around the conducting wire, the vibration energy of the permanent magnet. It is provided with a conversion unit that converts the permanent magnet into electrical energy and a limiting unit that limits the amplitude of the permanent magnet by a magnetic force.

In this aspect, the permanent magnet is oscillated by an alternating magnetic field formed around the conductor. The conversion unit converts the vibration energy of the permanent magnet into electrical energy. The conversion unit is, for example, a piezoelectric member. The power generation device according to this embodiment 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.
As the alternating current increases, the amplitude of the permanent magnet also increases, but the limiting portion uses the repulsive force of the magnetic force to limit the amplitude of the permanent magnet. Therefore, even when the alternating current is large, the conversion unit is not damaged and power can be generated. Further, since the structure is such that the amplitude of the permanent magnet is limited by using magnetic force in a non-contact manner, the life of the power generation device can be extended without mechanical wear of the limiting portion. Further, when the alternating current is small, the amplitude of the permanent magnet is small, so that the magnetic force of the limiting portion acting on the permanent magnet is small. Therefore, the amount of power generation does not decrease due to the decrease in the amplitude of the permanent magnet.
As described above, the power generation device according to this aspect can be applied to a wide current range.
The vibration frequency of the permanent magnet, that is, the resonance frequency is preferably configured to substantially match the frequency of the alternating magnetic field. For example, when the frequency of the alternating magnetic field is 50 Hz, the vibration frequency of the permanent magnet is 50 Hz, and when the frequency of the alternating magnetic field is 60 Hz, the vibration frequency of the permanent magnet is 60 Hz. However, the present invention also includes a configuration in which the vibration frequency of the permanent magnet is shifted from the frequency of the alternating magnetic field within the range in which the required electric power can be obtained.
Further, the conducting wire according to this embodiment is a linear member made of a material capable of passing an electric current, and also includes a rail-shaped conducting member, a bus bar, a prismatic conductor, and a plate-shaped conductor having a longitudinal direction. Included in the conductor. Further, the lead wire is not limited to that for a specific purpose, and may be a ground wire.

In the power generation device according to this embodiment, the limiting portion includes two magnets arranged on both outer sides in the vibration direction of the permanent magnet, and the magnet has the same pole as the permanent magnet on the surface facing the permanent magnet. Has magnetic poles.

In this embodiment, when the alternating current is large and the amplitude of the permanent magnet is large, the permanent magnet approaches the magnet of the limiting portion and receives a repulsive force by the magnetic force of the magnet. The amplitude of the permanent magnet is limited. Since the repulsive force is inversely proportional to the square of the distance between the magnet at the limiting portion and the permanent magnet, the amplitude of the permanent magnet is effectively limited.
On the other hand, when the alternating current is small and the amplitude of the permanent magnet is small, the permanent magnet does not approach the magnet of the limiting portion. As described above, since the repulsive force is inversely proportional to the square of the distance between the magnet of the limiting portion and the permanent magnet, the magnetic force of the limiting portion received by the permanent magnet is limited.
As described above, the amplitude of the permanent magnet 3 can be limited according to the magnitude of the alternating current with a simple configuration in which the two magnets are arranged outside in the vibration direction of the permanent magnet.

The power generation device according to this aspect includes an adjusting unit that adjusts the distance between the two magnets with respect to the permanent magnet.

In this embodiment, the resonance frequency of the permanent magnet fluctuates under the influence of the magnetic force acting between the permanent magnet and the limiting portion. The adjusting unit can adjust the resonance frequency by adjusting the distance between the magnet of the limiting unit and the permanent magnet, and can adjust the resonance frequency to the frequency of AC. For example, even if the characteristics of parts such as a conversion unit and a permanent magnet vary, the resonance frequency can be easily adjusted to the AC frequency.

The power generation device according to this aspect includes a partition wall that separates the permanent magnet from the magnet.

In this embodiment, the partition wall can prevent the permanent magnet from coming into contact with the magnet. For example, when arranging a permanent magnet or a limiting portion in a manufacturing process, it is possible to prevent a finger from being pinched between the permanent magnet and the magnet of the limiting portion due to a strong attractive force.

The transmission device according to this aspect includes any one of the above 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 this embodiment, the transmission unit can be driven by using the electric energy converted 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, it is possible to generate electricity by using a low frequency alternating magnetic field of 10 Hz order formed around a conducting wire, and it can be applied to a wide current range.

It is a perspective view of the power generation apparatus which concerns on Embodiment 1 of this invention. It is a top view of the power generation apparatus which concerns on this Embodiment 1. It is a front view of the power generation apparatus which concerns on this Embodiment 1. It is a conceptual diagram for explaining the force acting on the permanent magnets arranged around the conducting wire. It is a vector figure which shows the relationship between the position of a permanent magnet with respect to a conducting wire, and the force acting on the permanent magnet. It is a contour figure which shows the relationship between the position of a permanent magnet with respect to a conducting wire, and the magnitude and direction of the force acting on the permanent magnet in the x-axis direction. It is a top view of the power generation apparatus which concerns on Embodiment 2. FIG. It is a front view which shows the power generation apparatus which concerns on this Embodiment 3. It is a block diagram which shows the voltage adjustment 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)
1 is a perspective view of the power generation device 100 according to the first embodiment of the present invention, FIG. 2 is a plan view of the power generation device 100, and FIG. 3 is a front view of the power generation device 100. The power generation device 100 according to the first embodiment of the present invention includes a base portion 10 that holds a conducting wire W through which low-frequency ACs on the order of 10 Hz flow, a cantilever (conversion unit) 1 as an elastic body having a piezoelectric member, and a cantilever 1. A fixed portion 2 for fixing the fixed end 1a to the lead wire W, a permanent magnet 3 provided at the free end 1b of the cantilever 1, and an output portion 4 for outputting the voltage generated in the piezoelectric member of the cantilever 1. It includes two magnets (restricting portions) 5 that limit the amplitude of the permanent magnet 3 by a magnetic force.

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 generates electricity by converting the AC magnetic field formed around the lead wire W into the kinetic energy of the permanent magnet 3 and converting the kinetic energy of the permanent magnet 3 into electrical energy by the piezoelectric member.
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 permanent magnet 3 flows, and the shape is not particularly limited, and a rail-shaped conductive member and a bus bar. , A prismatic conductor, or a plate-shaped conductor having a longitudinal direction may be used. 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 base 10 has a flat plate-shaped first half body and a second half body. As shown in FIG. 1, for example, the first half body and the second half body form the lower half and the upper half of the base 10, respectively, and are screwed with bolts. The first half body and the second half body have surfaces facing each other, that is, an upper surface of the first half body and a linear groove portion in which the lead wire W is fitted on the lower surface of the second half body. The second half body and the second half body hold the lead wire W so as to sandwich the lead wire W in the groove portion.

The cantilever 1 is a power generation member using a bimorph type piezoelectric element. The cantilever 1 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 polarized in the thickness direction, and the two piezoelectric members form the long plate portion. It is attached to both sides of the long plate so as to be sandwiched. Further, each of the two piezoelectric members is provided with a sheet-shaped electrode.
The member constituting the long plate portion is a metal such as stainless steel. The piezoelectric member is, for example, piezoelectric ceramics. One end in the longitudinal direction of the long plate portion is a fixed end 1a fixed to the fixed portion 2, and the other end in the longitudinal direction of the long plate portion is a free end 1b that can be displaced by an external force. When the free end 1b is displaced, the two piezoelectric members 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, a unimorph structure in which a piezoelectric member is attached to only one side may be used. The piezoelectric member is an example of a conversion unit that converts the vibration energy of a permanent magnet 3 that vibrates by an alternating magnetic field formed around a conducting wire W into electrical energy.

The fixing portion 2 is a member that fixes the fixing end 1a of the cantilever 1 to an appropriate portion of the base portion 10, for example, the upper surface. More specifically, in the fixing portion 2, the free end 1b of the cantilever 1 is displaced or vibrates in a direction substantially orthogonal to the center line direction of the lead wire W and the radial direction of the lead wire W (left-right direction in FIG. 3). , Holds the cantilever 1. In other words, the fixing portion 2 holds the fixed end 1a of the cantilever 1 so that the thickness direction of the cantilever 1 and the center line direction and the radial direction are substantially orthogonal to each other.

The permanent magnet 3 has a rectangular plate shape and is fixed to the free end 1b of the cantilever 1 in a posture in which the thickness direction faces the radial direction of the lead wire W. The thickness direction means the direction in which the length of the permanent magnet 3 is the shortest among the vertical dimension, the horizontal dimension, and the height dimension. As shown in FIG. 3, the permanent magnet 3 has a single pair of N poles 3a and S poles 3b arranged in the separation direction of the lead wire W and the permanent magnet 3, that is, the thickness direction. The shape of the permanent magnet 3 and the posture with respect to the lead wire W are not the essential configurations of the present invention, but merely show one configuration example. In the first embodiment, it is more important that the N poles 3a and the S poles 3b constituting the permanent magnet 3 are arranged in the separation direction.

The permanent magnet 3 fixed to the free end 1b of the cantilever 1 in this way is displaceable with respect to the conducting wire W through which alternating current flows, and the alternating magnetic field formed around the alternating current wire W causes a force in the left-right direction in FIG. Receives and vibrates. The principle of vibration of the permanent magnet 3 will be described later.
The vibration frequency of the permanent magnet 3 provided on the cantilever 1 is configured to substantially match the frequency of the alternating magnetic field formed around the lead wire W. For example, when the frequency of the alternating magnetic field is 50 Hz, the vibration frequency of the permanent magnet 3 is 50 Hz, and when the frequency of the alternating magnetic field is 60 Hz, the vibration frequency of the permanent magnet 3 is 60 Hz. The fact that the vibration 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 vibration frequency deviates from the frequency of the alternating magnetic field within the range in which the required electric power can be obtained. means.

The output unit 4 is a circuit that is connected to the electrode of the cantilever 1 and the long plate portion and outputs the voltage generated in the piezoelectric member that expands and contracts due to the vibration of the permanent magnet 3. The output unit 4 includes, for example, a rectifier circuit and a smoothing capacitor. The rectifier circuit is, for example, a diode bridge circuit. The diode bridge is a circuit configuration in which two sets of a series circuit composed of two forward-connected diodes are arranged in parallel. The input terminal of the rectifier circuit is connected to the piezoelectric member and the long plate portion, and each terminal of the smoothing capacitor is connected to the output terminal pair of the rectifier circuit. The rectifier circuit full-wave rectifies the alternating current generated in the piezoelectric member of the cantilever 1, and outputs the DC voltage smoothed by the smoothing capacitor to the load R.

The two magnets 5 according to the present embodiment are for limiting the amplitude of the permanent magnet 3. The two magnets 5 are arranged on both outer sides of the permanent magnet 3 in the vibration direction in a direction and a posture that repel the permanent magnet 3. The magnet 5 has a rectangular plate shape similar to that of the permanent magnet 3, and has a fixing bolt hole penetrating in the thickness direction. The magnet 5 is fixed to the upper surface of the base 10 and the parts on both outer sides of the permanent magnet 3 in the vibration direction with bolts. As shown in FIG. 3, the two magnets 5 have the north pole 5a of the same pole on the surface of the permanent magnet 3 facing the north pole 3a. Similarly, the permanent magnet 3 has an S pole 5b having the same pole on the surface facing the S pole 3b. In short, the magnet 5 has an N pole 5a and an S pole 5b at positions where a repulsive force acts when the vibrating permanent magnet 3 approaches the magnet 5.
The magnet 5 is, for example, a ferrite magnet, a neodymium magnet, a samarium-cobalt magnet, or the like, but the type thereof is not particularly limited. Further, the shape of the magnet 5 and the method of forming the magnetic poles are not particularly limited.

Further, the power generation device 100 may be provided with an elongated hole 10a in the base portion 10 as an adjusting unit for adjusting the distance between the two magnets 5 with respect to the permanent magnet 3. The elongated hole 10a is a hole through which a bolt for fixing the magnet 5 to the base 10 is inserted. By adjusting the screwing position of the magnet 5, the distance between the two magnets 5 with respect to the permanent magnet 3 can be adjusted. The elongated hole 10a is an example of an adjusting unit. A screw mechanism provided on the base 10 may be configured to adjust the position of the magnet 5 with respect to the permanent magnet 3. Further, the bolt hole of the magnet 5 may be formed as an elongated hole so that the position of the magnet 5 can be adjusted.

<Force acting on the permanent magnet 3 arranged near the lead wire W>
FIG. 4 is a conceptual diagram for explaining the force acting on the permanent magnets 3 arranged around the lead wire W. When an electric current is passed through the lead wire W, a magnetic field is formed around the lead wire W according to Ampere's law. In FIG. 4, the x-axis, the y-axis, and the z-axis are the coordinate axes of the Cartesian coordinate system, and it is assumed that the current flows in the positive direction (front direction of the paper) of the z-axis. The magnetic field around the lead wire W has a gradient in the x-axis direction and the y-axis direction. When a permanent magnet 3 having a magnetic dipole oriented in the y-axis direction is arranged in the vicinity of the lead wire W, the magnetic force received by the permanent magnet 3 is represented by the following equations (1) and (2).

FIG. 5 is a vector diagram showing the relationship between the position of the permanent magnet 3 with respect to the lead wire W and the force acting on the permanent magnet 3. The magnitude of the force acting on the permanent magnet 3 depends only on the distance from the lead wire W, but the direction of the force acting on the permanent magnet 3 differs depending on the position with respect to the lead wire W. As shown in FIG. 5, the permanent magnet 3 has S poles and N poles aligned in the x-axis direction regardless of the position with respect to the lead wire W. The current is flowing toward the back of the paper. In FIG. 5, it can be seen that a force acts in the x-axis direction at the vertical and horizontal positions of the lead wire W, and a force acts in the y-axis direction at a position 45 degrees with respect to the x-axis or the y-axis.

FIG. 6 is a contour diagram showing the relationship between the position of the permanent magnet 3 with respect to the lead wire W and the magnitude and direction of the force acting on the permanent magnet 3 in the x-axis direction. FIG. 6A is a contour diagram showing the output image of the simulation result in gray scale, and FIG. 6B is a contour diagram schematically showing the direction (color) of the force that cannot be expressed in gray scale with or without hatching. .. In FIG. 6B, the white area P1 without hatching indicates that a leftward force acts on the permanent magnet 3, and the hatched area P2 indicates that a rightward force acts on the permanent magnet 3. Shows that it works. As shown by the broken line, it is arranged in the left and right regions P1 (white regions P1 in FIG. 6B) in FIG. 6 among the four regions divided by the boundary of about 45 degrees with respect to the x-axis and the y-axis. A force in the left direction acts on the permanent magnet 3 as shown by the white left arrow, and the permanent magnet 3 is arranged in the upper and lower regions P2 (in FIG. 6B, the hatched region P2) in FIG. A force acts in the right direction as indicated by the white arrow. As described above, in the region P1 and the region P2, the directions of the forces acting on the permanent magnet 3 are opposite to each other. When the permanent magnet 3 of the power generation device 100 is vibrated to generate power, it is preferable to use one of the regions P1 and P2 so that forces in the same direction act.

<Governing equation of piezoelectric vibration power generation element>
The governing equation of the piezoelectric vibration power generation element in which the permanent magnet 3 is provided at the free end 1b of the cantilever 1 is the following equation (3) when the permanent magnet 3 is arranged above and below the lead wire W, that is, on the y-axis in FIG. And (4). The governing equation when the permanent magnets 3 are arranged on the left and right sides of the lead wire W, that is, on the x-axis is also expressed in the same manner.

<Amplitude limitation of permanent magnet 3 by magnet 5>
The repulsive force generated between the permanent magnet 3 and the magnet 5 is inversely proportional to the square of the distance between the permanent magnet 3 and the magnet 5. When the current flowing through the lead wire W increases, the amplitude of the permanent magnet 3 increases and the distance from the magnet 5 decreases. Then, a repulsive force is generated between the permanent magnet 3 and the magnet 5, and the force acts in the direction of suppressing the amplitude of the permanent magnet 3. Therefore, when the alternating current is large, the amplitude of the permanent magnet 3 can be limited.
When the current flowing through the lead wire W is small, the amplitude of the permanent magnet 3 of the permanent magnet 3 is small and the distance from the permanent magnet 5 is large. Then, the force acting between the permanent magnet 3 and the magnet 5 becomes smaller in inverse proportion to the square. Therefore, the force that hinders the vibration of the permanent magnet 3 does not work, and there is no possibility that the amount of power generation will decrease.

<Action and effect of the power generation device 100 according to this embodiment>
As described above, according to the power generation device 100 according to the first embodiment, it is possible to generate power by using a low frequency alternating magnetic field of 10 Hz order formed around the lead wire W, and it is applied to a wide current range. be able to.
Further, a load is applied to the fixed portion 2 of the permanent magnet 3 as compared with the configuration in which the amplitude of the permanent magnet 3 is limited by arranging rubber, a spring or the like on the outside in the vibration direction of the permanent magnet 3 to absorb the impact. No, long-term reliability can be obtained.

Further, the amplitude of the permanent magnet 3 can be limited according to the magnitude of the alternating current by a simple configuration in which the two magnets (restricting portions) 5 are arranged outside the vibration direction of the permanent magnet 3.

Furthermore, the resonance frequency can be adjusted by adjusting the distance between the magnet 5 and the permanent magnet 3 using the elongated hole (adjustment unit) 10a, and the resonance frequency of the permanent magnet 3 can be adjusted to the frequency of AC. it can.

Furthermore, the vibration energy of the permanent magnet 3 can be converted into electrical energy with a simple configuration using a piezoelectric member.

(Embodiment 2)
FIG. 7 is a plan view of the power generation device 200 according to the second embodiment. The power generation device 200 according to the second embodiment includes a first partition wall 206 that separates the permanent magnet 3 from the first magnet 5 arranged on the left side in FIG. 7. Further, the power generation layer value 200 includes a permanent magnet 3 arranged on the right side in FIG. 7 and a second partition wall 206 that separates the second magnet 5. The partition wall 206 is a plate-shaped member made of a non-magnetic material, and the partition wall 206 is fixed to the base 10 so as to separate the permanent magnet 3 and the magnet 5. The location of the partition wall 206 is not particularly limited as long as it does not interfere with the vibration of the permanent magnet 3.

According to the power generation device 200 according to the second embodiment, it is possible to prevent the permanent magnet 3 and the magnet 5 from coming into contact with each other. For example, when arranging the permanent magnet 3 or the magnet 5 in the manufacturing process, it is possible to prevent a finger from being pinched between the permanent magnet 3 and the magnet 5 due to a strong attractive force. Further, in the manufacturing process, it is possible to prevent the magnet 5 from colliding with the permanent magnet 3 and damaging the cantilever 1.

(Embodiment 3)
In the third embodiment, the power generation device 300 has a configuration different from that of the first embodiment in that the vibration energy of the permanent magnet 3 is converted into electric energy. Therefore, 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. 8 is a front view showing the power generation device 300 according to the third embodiment. For convenience of drawing, the illustration of the fixed portion 2 is omitted. In the power generation device 300 according to the third embodiment, a cantilever (not shown) as an elastic body having no piezoelectric member and a fixed end of the cantilever are fixed to a conducting wire W through which low-frequency AC of 10 Hz order flows. The unit 2, the permanent magnet 3 provided at the free end of the cantilever, the electric generator 306 that converts the vibration energy of the permanent magnet 3 into electric energy, and the output unit that outputs the electric energy converted by the electric energy 4 and. The permanent magnet 3 provided at the free end of the cantilever vibrates in the left-right direction in FIG.

The electret generator 306 is provided in place of the piezoelectric member of the first embodiment, and is a device that converts the vibration energy of the permanent magnet 3 into electrical energy. The electret generator 306 includes a first electrode substrate 361 having a plurality of electrets 361a and a conductive second electrode substrate 362 having a plurality of counter electrodes 362a facing each of the plurality of electrets 361a. The electret 361a is a charged body that stores an electric charge. The electret 361a holds the charge semi-permanently and forms an electric field. The first electrode substrate 361 is fixed to the permanent magnet 3 in a posture in which a plurality of electrets 361a are arranged in the vibration direction of the permanent magnet 3. The first electrode substrate 361 has a predetermined movable range.

The second electrode substrate 362 is fixed in such a posture that the plurality of counter electrodes 362a face each of the plurality of electrets 361a so that the positions with respect to the lead wire W do not change. For example, the second electrode substrate 362 is fixed to the fixing portion 2. The counter electrode 362a is a conductive member, and charges are stored by electrostatic induction.

The permanent magnet 3 vibrates laterally in FIG. 8 due to the alternating magnetic field formed around the conducting wire W. When the permanent magnet 3 vibrates, the relative positions of the electret 361a and the counter electrode 362a change, and the electric charge moves. In this way, the electret generator 306 can convert the vibration energy of the permanent magnet 3 into electrical energy, and the voltage generated by the movement of the charge is output from the output unit 4.

According to the power generation device 300 according to the third embodiment, even if the frequency of the alternating magnetic field formed around the lead wire W is as low as 10 Hz, power can be generated based on the alternating magnetic field. The amplitude of the permanent magnet 3 can be suppressed within the movable range of the first electrode substrate 361. In the third embodiment, the vibration energy of the permanent magnet 3 can be converted into electrical energy with a simple configuration using the electret generator 306.

In the third embodiment, an example in which the electret generator 306 is provided instead of the piezoelectric member of the first embodiment has been described, but the electret generator 306 may be provided instead of the piezoelectric member according to the second embodiment. Further, an example in which the first electrode substrate 361 is provided on the permanent magnet 3 and the second electrode substrate 362 is fixed to the lead wire W has been described. However, the second electrode substrate 362 is provided on the permanent magnet 3 and the first electrode substrate 361 is provided. May be fixed to the lead wire W.

Although the electlet generator 306 has been described as an alternative means of the piezoelectric member, a known generator capable of converting the vibration energy of the permanent magnet 3 into electrical energy, such as a generator having a magnetostrictive element, may be used instead of the piezoelectric member. ..

(Embodiment 4)
FIG. 9 is a block diagram showing a voltage adjusting device according to the fourth embodiment. The voltage regulator according to the fourth embodiment includes a voltage regulator 407 for adjusting the voltage of the lead wire W connected to the system, a detection device 408 for detecting the state of the voltage regulator 407, and the detection device 408. A transmission device 409 that wirelessly transmits the detected detection information to the outside is provided. The voltage regulator 407 is, for example, an SVR (Step Voltage Regulator), an SVC (static var compensator), or the like, and the detection information is the voltage, current, voltage adjustment content, etc. on the upstream side and the downstream side of the voltage regulator 407. ..

The transmission device 409 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 detection device 408. A unit 491 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 491, and the transmission unit 491 is driven by the voltage output from the power generation device 100.

According to the voltage adjusting device according to the fourth embodiment, the transmission unit 491 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 491 are arranged on the side of the voltage regulator 407 provided in the middle of the transmission line, and the information related to the voltage regulator 407 is wirelessly transmitted to the outside. Can be sent.

In the fourth embodiment, an example including the power generation device 100 according to the first embodiment has been described. Needless to say, the voltage according to the fourth embodiment is used by using the power generation devices 200 and 300 according to the second to third embodiments. An adjusting device may be configured.
Further, although the cantilever 1 has been exemplified as a configuration for supporting the permanent magnet 3 in a displaceable manner, the support mechanism is not particularly limited to the cantilever 1 as long as the permanent magnet 3 can be moved by a vibrating magnetic field.

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 power generator, 1 cantilever (conversion part), 1a fixed end, 1b free end 1b, 2 fixed part, 3 permanent magnets, 4 output parts, 5 magnets (restriction part), 10a slot (adjustment part), 206 partition walls, W lead wire

Claims (5)

Permanent magnets that are displaceable with respect to the conducting current through which alternating current flows,
When the permanent magnet vibrates due to an alternating magnetic field formed around the conducting wire, a conversion unit that converts the vibration energy of the permanent magnet into electrical energy
A power generation device including a limiting portion that limits the amplitude of the permanent magnet by a magnetic force. The restriction part is
It is provided with two magnets arranged on both outer sides of the permanent magnet in the vibration direction.
The magnet is
The power generation device according to claim 1, which has a magnetic pole having the same pole as the permanent magnet on a surface facing the permanent magnet. The power generation device according to claim 2, further comprising an adjusting unit for adjusting the distance between the two magnets with respect to the permanent magnet. The power generation device according to claim 2 or 3, further comprising a partition wall separating the permanent magnet from the magnet. The power generation device according to any one of claims 1 to 4.
Equipped with a transmitter that transmits signals
The transmitter
A transmitter driven by a voltage output from the power generator.

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