JP2020114136A - Power generation device, transmission device, and power generation method - Google Patents

Abstract

To provide a power generation device capable of performing power generation on the basis of an AC magnetic field formed around a conductor even when the frequency of the AC magnetic field is as low as 10 Hz.SOLUTION: A power generation device includes a permanent magnet 3 provided displaceably with respect to a conducting wire W through which an alternating current flows, a conversion unit that converts vibration energy of a permanent magnet 3 into electric energy when the permanent magnet 3 vibrates due to the AC magnetic field formed around the conducting wire W, and an output unit 4 that outputs the converted electric energy.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power generation device, a transmission device, and a power generation method for converting an AC magnetic field into kinetic energy of a permanent magnet and converting the kinetic energy into electric power.

As a power generation method using an AC magnetic field as an energy source, there is a method using a coil. The alternating magnetic field is formed, for example, around a conductor wire connected to a system power supply. An electromotive force is induced in the coil arranged in the vicinity of the conducting wire by an alternating magnetic field to generate power.

On the other hand, Patent Document 1 discloses an AC current sensor that detects a current flowing through a conductor. The AC current sensor is provided on a substrate having a recess, a piezoelectric film having one end fixed to an edge of the recess and the other end displaceably supported in the recess, and the other end of the piezoelectric film. And a magnetic material. The magnetic body is displaced according to the magnitude of the magnetic field formed around the conducting wire, and the piezoelectric film generates an electric charge according to the displacement. By detecting the magnitude of the electric charge, the value of the current flowing through the conducting wire can be detected.

JP 2006-138852 A

However, in the power generation method using a coil, the induced electromotive force is proportional to the frequency. Therefore, when using a small coil for a 50 Hz or 60 Hz system power supply, obtain a sufficient output voltage to drive an electronic circuit or the like. It is difficult.

Further, according to the AC current sensor of Patent Document 1, although a signal according to the AC magnetic field is output, it is difficult to obtain a sufficient output voltage for driving an electronic circuit or the like.

The present invention has been made in view of such circumstances, and an object thereof is to generate power based on the AC magnetic field even if the frequency of the AC magnetic field formed around the conductor is a low frequency of the order of 10 Hz. An object is to provide a power generation device and a power generation method that can be performed.

A power generator according to one aspect of the present invention is a permanent magnet that is displaceably provided with respect to a conducting wire through which alternating current flows, and the permanent magnet when the permanent magnet vibrates due to an alternating magnetic field formed around the conducting wire. A conversion unit for converting the vibration energy of the above into electric energy, and an output unit for outputting the electric energy converted by the conversion unit.

According to this aspect, the permanent magnet vibrates due to the alternating magnetic field formed around the conductive wire. The conversion unit converts the vibration energy of the permanent magnet into electric energy, and the electric energy converted by the conversion unit is output from the output unit. The power generator according to the present invention can generate power using the alternating magnetic field as an energy source even if the alternating magnetic field has a low frequency of the order of 10 Hz.
In addition, it is preferable that the vibration frequency of the permanent magnet, that is, the resonance frequency, be substantially equal to 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 preferably 60 Hz. However, the present invention includes a configuration in which the vibration frequency of the permanent magnet is deviated from the frequency of the alternating magnetic field within a range in which required power can be obtained.
Further, the conducting wire according to this aspect is a linear member formed 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. The conductor wire is not limited to a specific one, and may be a ground wire.

In the power generator according to this aspect, the permanent magnet has an S pole and an N pole arranged in a non-orthogonal direction with respect to a separation direction of the conductive wire and the permanent magnet, and intersects with an alternating current flowing direction and the separating direction. A configuration that vibrates in the direction of rotation is preferable.

According to this aspect, the possibility of collision between the vibrating permanent magnet and the conducting wire can be reduced, and efficient power generation using an alternating magnetic field is possible (see, for example, FIGS. 4 and 17). .. If the permanent magnet has S poles and N poles arranged in a direction orthogonal to the separating direction of the conducting wire and the permanent magnet and configured to vibrate in the separating direction (see FIG. 18), vibration of the permanent magnet Therefore, the permanent magnet may collide with the lead wire.
On the other hand, according to this aspect, as shown in FIGS. 4 and 17, the permanent magnet vibrates in a direction deviating from the direction toward the center of the conducting wire, thus reducing the possibility that the permanent magnet collides with the conducting wire. You can The above description does not limit the scope of the invention according to this aspect.

In the power generator according to this aspect, the permanent magnet has an S pole and an N pole arranged in a separating direction of the conducting wire and the permanent magnet, and vibrates in a flow direction of an alternating current and a direction orthogonal to the separating direction. Is preferred.

According to this aspect, it is possible to reliably avoid the collision between the vibrating permanent magnet and the conductive wire, and it is possible to efficiently generate electric power using the alternating magnetic field (see, for example, FIG. 4 ). According to the embodiment shown in FIG. 4, the permanent magnet is separated from the conductor in the rest position upward in FIG. 4, and the alternating magnetic field causes the permanent magnet to vibrate in the left-right direction in FIG. In this case, the distance between the permanent magnet and the conducting wire is always large, and the conducting wire will not approach any more. Therefore, it is possible to reliably prevent the permanent magnet from colliding with the conducting wire. The above description does not limit the scope of the invention according to this aspect.

In the power generation device according to this aspect, it is preferable that the width of the permanent magnet in the vibration direction satisfies the following formula.
w≦2 (d−√2a)
However,
w: width of the permanent magnet in the vibration direction d: distance between the center of the conductive wire and the permanent magnet a: amplitude of the permanent magnet

According to this aspect, it is possible to prevent reverse force from acting on each part of the permanent magnet, and efficient power generation using an alternating magnetic field is possible.

In the power generation device according to this aspect, it is preferable that the width of the permanent magnet in the separating direction is 0.5 times or more and 2 times or less the distance between the center of the conductive wire and the permanent magnet.

According to this aspect, by setting the width of the permanent magnet in the separating direction as described above, efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, the permanent magnet has an S pole and an N pole that are orthogonal to the flow direction of the alternating current and are arranged in a direction of approximately 45 degrees with respect to the separating direction of the conductive wire and the permanent magnet. It is preferable to vibrate in the arrangement direction of the S pole and the N pole.

According to this aspect, it is possible to generate electric power by vibrating the permanent magnets in the direction in which the S pole and the N pole are arranged.

In the power generator according to this aspect, the permanent magnet has an S pole and an N pole arranged in a direction orthogonal to a flow direction of an alternating current and a separation direction of the lead wire and the permanent magnet, and vibrates in the separation direction. The configuration is preferable.

According to this aspect, it is possible to generate electricity by vibrating the permanent magnet in the separating direction.

In the power generator according to this aspect, the permanent magnet has a plurality of sets of S poles and N poles arranged in the vibration direction, and in the arrangement of the S poles and N poles in the vibration direction, adjacent poles are different poles. The configuration as described above is preferable.

According to this aspect, by providing a permanent magnet having a plurality of sets of S poles and N poles and arranging the S poles and N poles so that the opposite force does not act on each part of the permanent magnet, the AC magnetic field is generated. Efficient power generation using it is possible.

In the power generator according to this aspect, it is preferable that the permanent magnet has a C shape surrounding the conductor wire, has S poles and N poles arranged in a radial direction, and vibrates in the circumferential direction of the conductor wire.

According to this aspect, by arranging the permanent magnets widely along the circumferential direction of the conductor, each part of the permanent magnet can be brought close to the conductor, and efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, it is preferable that the permanent magnet is flat in a direction in which the conductive wire and the permanent magnet are separated from each other.

According to this aspect, by arranging the permanent magnet in a flat posture in the separating direction, each part of the permanent magnet can be brought close to the conductor wire, and efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, it is preferable that the permanent magnet has a longitudinal direction along the conductive wire.

According to this aspect, by arranging each part of the permanent magnet along the conductive wire, each part of the permanent magnet can be brought close to the conductive wire, and efficient power generation using an alternating magnetic field is possible.

In the power generation device according to this aspect, it is preferable that the permanent magnet has a size such that each part receives a magnetic force in the same direction at least at a vibration center position.

According to this aspect, it is possible to prevent reverse force from acting on each part of the permanent magnet at least at the stationary position of the permanent magnet, and efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, it is preferable that the permanent magnet has a size such that each part receives a magnetic force in the same direction at an arbitrary vibration position.

According to this aspect, even when the permanent magnet vibrates, it is possible to prevent the opposite force from acting on each part of the permanent magnet, and it is possible to efficiently generate electric power using the alternating magnetic field.

The power generator according to the present aspect includes an elastic body and a fixing portion that fixes the first portion of the elastic body to a conducting wire through which alternating current flows, and the permanent magnet changes its position with respect to the conducting wire due to an external force. The converter is provided at a second portion of the elastic body, and the conversion unit includes a piezoelectric member provided on the elastic body, and the permanent magnet vibrates due to an alternating magnetic field formed around the conductive wire. The voltage generated in the piezoelectric member by the vibration of the magnet is output from the output unit.

According to this aspect, the permanent magnet provided on the elastic body vibrates due to the alternating magnetic field formed around the conductive wire. The piezoelectric member included in the elastic body is deformed by the vibration of the permanent magnet to generate electric power, and the voltage generated in the piezoelectric member is output from the output unit. The power generator according to the present invention can generate power using the alternating magnetic field as an energy source even if the alternating magnetic field has a low frequency of the order of 10 Hz.

In the power generator according to this aspect, it is preferable that the elastic body does not have any structure other than the permanent magnet in the second portion.

According to this aspect, since no extra non-magnetic component is provided, efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, it is preferable that the second portion of the elastic body is connected to the central portion of the permanent magnet.

According to this aspect, the permanent magnets can be supported by the elastic body in good balance, and efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, it is preferable that the elastic body is a cantilever.

According to this aspect, power generation using an alternating magnetic field is possible with a simple configuration in which a permanent magnet is provided at the free end of the cantilever.

In the power generator according to this aspect, it is preferable that the elastic body has a long plate portion, the piezoelectric member has a plate shape, and the piezoelectric members are arranged on both surfaces of the long plate portion.

According to this aspect, by disposing the piezoelectric members on both surfaces of the long plate portion forming the cantilever, efficient power generation using an alternating magnetic field is possible.

In the power generator according to this aspect, the conversion unit has a first electrode substrate having an electret and a conductive second electrode substrate having a counter electrode facing the electret, and the vibration of the permanent magnet is electrically generated. It has an electret generator that converts it into energy.

According to this aspect, the electret generator converts the vibration energy of the permanent magnet vibrating by the AC magnetic field formed around the lead wire into the electric energy, and the electric energy converted by the conversion unit is output from the output unit. ..

A transmitter according to one aspect of the present aspect includes any one of the power generators described above and a transmitter that transmits a signal, and the transmitter is driven by a voltage output from the power generator.

According to this aspect, it is possible to drive the transmitter using the voltage output from the power generator. Therefore, the signal can be transmitted from the transmitter even in an environment in which a power source cannot be prepared.

A power generation method according to one aspect of the present invention provides a permanent magnet that is displaceably provided with respect to a conducting wire through which an alternating current flows, vibrates the permanent magnet by an alternating magnetic field formed around the conducting wire, and The vibration energy of the magnet is converted into electric energy, and the electric energy converted by the vibration of the permanent magnet is output.

According to this aspect, as described above, even if the frequency of the alternating magnetic field is a low frequency of the order of 10 Hz, it is possible to generate electricity using the alternating magnetic field as an energy source.

According to the present invention, even if the frequency of the alternating magnetic field formed around the conducting wire is a low frequency of the order of 10 Hz, it is possible to generate power based on the alternating magnetic field.

1 is a perspective view of a power generation device according to a first embodiment of the present invention. FIG. 3 is a plan view of the power generation device according to the first embodiment. It is a side view of the power generator according to the first embodiment. It is a front view of the power generator according to the first embodiment. It is a circuit diagram of the power generator according to the first embodiment. It is a conceptual diagram for demonstrating the force which acts on the permanent magnet arrange|positioned around the conducting wire. It is a vector diagram which shows the relationship between the position of a permanent magnet with respect to a conducting wire, and the force which acts on the said permanent magnet. FIG. 6 is a contour diagram showing the relationship between the position of the permanent magnet with respect to the lead wire and the magnitude and direction of the force acting on the permanent magnet in the x-axis direction. It is a graph of a simulation result showing the relationship between the arrangement and frequency of the permanent magnets, the resistance value of the load, and the amount of power generation. It is a graph of the simulation result which shows the relationship between the distance between a conducting wire and a permanent magnet, and the amount of power generation. It is a graph of the simulation result which shows the relationship of the distance of a permanent magnet with respect to a conducting wire, the amount of power generation, and the amount of displacement. It is a graph of the simulation result which shows the influence which the characteristic of a permanent magnet has on power generation. It is a schematic diagram which shows the example of an arrangement attitude of a permanent magnet. It is a graph of the simulation result which shows the relationship between the thickness of a permanent magnet and the amount of power generation. It is a schematic diagram showing an experimental power generator. 6 is a graph of experimental results showing the relationship between the arrangement and frequency of permanent magnets and the amount of power generation. It is a front view which shows the electric power generating apparatus which concerns on this Embodiment 2. It is a front view which shows the electric power generating apparatus which concerns on this Embodiment 3. It is a perspective view which shows the electric power generating apparatus which concerns on this Embodiment 4. It is a perspective view which shows the electric power generating apparatus which concerns on this Embodiment 5. It is a front view which shows the electric power generating apparatus which concerns on this Embodiment 6. It is a block diagram which shows the voltage adjustment apparatus which concerns on this Embodiment 7.

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment thereof.
(Embodiment 1)
1 is a perspective view of a power generator 100 according to Embodiment 1 of the present invention, FIG. 2 is a plan view of the power generator 100, FIG. 3 is a side view of the power generator 100, and FIG. 4 is a front view of the power generator 100. It is a figure. A power generator 100 according to Embodiment 1 of the present invention includes a cantilever 1 as an elastic body having a piezoelectric member 12 and a fixed end 1a (first portion) of the cantilever 1 through which a low-frequency alternating current of the order of 10 Hz flows. A fixed portion 2 fixed to W, a permanent magnet 3 provided at a free end 1b (second portion) of the cantilever 1, and an output portion 4 for outputting a voltage generated in the piezoelectric member 12 of the cantilever 1 are provided. .. In the first embodiment, the conducting wire W is a linear member formed of a material having a substantially circular cross section capable of passing an electric current, and the conducting wire W is connected to a system power source of 50 Hz or 60 Hz. To do. The power generation device 100 converts the AC magnetic field formed around the conducting wire W into kinetic energy of the permanent magnet 3 and converts the kinetic energy of the permanent magnet 3 into electric power by the piezoelectric member 12 to generate electric power. The power generation device 100 is a device that implements or realizes the power generation method according to the present invention.
The configuration of the conducting wire W is an example, and the configuration is not particularly limited as long as a current capable of forming an AC magnetic field for vibrating the permanent magnet 3 flows, and a rail-shaped conducting member, a bus bar. The conductor may be a prismatic conductor or a plate conductor having a longitudinal direction. Further, the conductive wire W may partially have a non-linear strip portion such as a rectangular plate shape, and may have a shape that allows an alternating current to flow in a predetermined direction as a whole. The configuration in which the power generation device 100 is fixed to the non-linear portion is also included in the present invention. Furthermore, the conducting wire W does not necessarily have to be linear and may be partially curved. Furthermore, the conductive wire W is not limited to a specific one, and may be a ground wire. Hereinafter, in the first embodiment, the conductive wire W will be described as a linear member.

The cantilever 1 is a power generation member using a bimorph type piezoelectric element. The cantilever 1 includes a long plate portion 11 made of a conductive member that is elastically deformable by an external force, and two plate-shaped or sheet-shaped piezoelectric members 12 polarized in the thickness direction, and the two piezoelectric members 12 are long. The long plate 11 is attached to both sides of the long plate 11 so as to sandwich the plate 11. It is sufficient for the length of the piezoelectric member 12 in the longitudinal direction to be about 2/3 of the length of the protruding portion of the long plate portion 11 from the fixing portion 2. Further, each of the two piezoelectric members 12 is provided with a sheet-shaped electrode 13. The member forming the long plate portion 11 is a metal such as stainless steel. The piezoelectric member 12 is, for example, piezoelectric ceramics. One longitudinal end of the long plate portion 11 is a fixed end 1a fixed to the fixing portion 2, and the other longitudinal end of the long plate portion 11 is a free end 1b displaceable by an external force. When the free end 1b is displaced, the two piezoelectric members 12 expand and contract respectively, and a voltage is generated between the electrode 13 and the long plate portion 11.
Although the bimorph type piezoelectric element is described here, a unimorph structure in which the piezoelectric member 12 is attached to only one surface may be used. The piezoelectric member 12 is an example of a conversion unit that converts the vibration energy of the permanent magnet 3 vibrated by the AC magnetic field formed around the conducting wire W into electric energy.

The fixing portion 2 is a member that fixes the fixed end 1 a of the cantilever 1 to the conducting wire W. The fixed portion 2 has, for example, a substantially rectangular parallelepiped shape, and has a through hole 21 through which the conductive wire W is inserted. The through hole 21 has a circular shape as viewed from the front and penetrates through the central portion, and the fixed end 1a of the cantilever 1 is fixed to a corner portion on one surface side of the fixing portion 2 in which the through hole 21 is formed, and holds the cantilever 1. There is. More specifically, the fixed portion 2 holds the cantilever 1 so that the free end 1b of the cantilever 1 is displaced or vibrated in a direction substantially orthogonal to the center line direction of the conductive wire W and the radial direction of the conductive wire W. .. In other words, the fixing portion 2 holds the fixed end 1a of the long plate portion 11 so that the thickness direction of the long plate portion 11 forming the cantilever 1 is substantially orthogonal to the center line direction and the radial direction. ..

The permanent magnet 3 has a rectangular plate shape, and is bonded and fixed to the free end 1b of the cantilever 1 in a posture in which the thickness direction faces the radial direction of the conductor W. The thickness direction means the direction in which the length of the permanent magnet 3 is the shortest among the longitudinal dimension, lateral dimension and height dimension. The adhesion is an example of a method of fixing the permanent magnet 3. The free end 1b of the cantilever 1 does not have any other structure except the permanent magnet 3 and the adhesive. The permanent magnet 3 has a single pair of the S pole 3b and the N pole 3a arranged in the separating direction of the conductor W and the permanent magnet 3, that is, in the thickness direction. It should be noted that the shape of the permanent magnet 3 and the attitude of the permanent magnet 3 with respect to the conducting wire W are not an essential configuration of the present invention, but merely a configuration example. In the first embodiment, it is more important that the S pole 3b and the N pole 3a forming the permanent magnet 3 are arranged in the separating direction.
The vibration frequency of the permanent magnet 3 provided on the cantilever 1 is configured to substantially match the frequency of the AC magnetic field formed around the conducting 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. It should be noted that the fact that the vibration frequency substantially matches the frequency of the AC magnetic field means that a configuration in which the vibration frequency is deviated from the frequency of the AC magnetic field is included in the power generation device 100 according to the first embodiment within a range in which required power can be obtained. means.

The permanent magnet 3 has a size such that each part receives a magnetic force in the same direction at least at the vibration center position. Preferably, the permanent magnet 3 has a size such that each part receives a magnetic force in the same direction at any vibration position. Specifically, the width of the permanent magnet 3 in the vibration direction may be set so as to satisfy the following formula (1).
w≦2 (d−√2a) (1)
However,
w: width of the permanent magnet 3 in the vibration direction d: distance between the center of the conductive wire W and the end surface of the permanent magnet 3 on the conductive wire side a: amplitude of the permanent magnet 3

Further, the width of the permanent magnet 3 in the separating direction may be set so as to satisfy the following expression (2).
0.5a≦d≦2a (2)

The output unit 4 is a circuit that is connected to the electrode 13 of the cantilever 1 and the long plate unit 11 and outputs the voltage generated in the piezoelectric member 12 that expands and contracts due to the vibration of the permanent magnet 3.

FIG. 5 is a circuit diagram of the power generation device 100 according to the first embodiment. The output unit 4 includes a rectifying circuit 41 and a smoothing capacitor 42. The rectifier circuit 41 is, for example, a diode bridge circuit. The diode bridge has a circuit configuration in which two sets of series circuits each including two diodes connected in sequence are arranged in parallel. The input terminal of the rectifier circuit 41 is connected to the piezoelectric member 12 and the long plate portion 11, and each terminal of the smoothing capacitor 42 is connected to the output terminal pair of the rectifier circuit 41. The rectifier circuit 41 full-wave rectifies the alternating current generated in the piezoelectric member 12, and outputs the direct current voltage smoothed by the smoothing capacitor 42 to the load R.

Details of the structure and power generation characteristics of the power generation device 100 that enables efficient power generation using an alternating magnetic field will be described below.

<Force acting on the permanent magnet 3 arranged near the conducting wire W>
FIG. 6 is a conceptual diagram for explaining the force acting on the permanent magnets 3 arranged around the conducting wire W. When a current is passed through the conductor W, a magnetic field is formed around the conductor W according to Ampere's law. In FIG. 6, the x-axis, the y-axis, and the z-axis are coordinate axes of the orthogonal coordinate system, and it is assumed that the current flows in the positive direction of the z-axis (the front side of the paper surface). The magnetic field around the conductor W has a gradient in the x-axis direction and the y-axis direction. When the permanent magnet 3 having a magnetic dipole oriented in the y-axis direction is arranged near the conducting wire W, the magnetic force received by the permanent magnet 3 is expressed by the following equations (3) and (4).

FIG. 7 is a vector diagram showing the relationship between the position of the permanent magnet 3 with respect to the conductor 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 conductor W, but the direction of the force acting on the permanent magnet 3 differs depending on the position with respect to the conductor W. In FIG. 7, it can be seen that the force in the x-axis direction acts at the upper, lower, left and right positions of the conducting wire W, and the force in the y-axis direction acts at a position of 45 degrees with respect to the x-axis or the y-axis.

FIG. 8 is a contour diagram showing the relationship between the position of the permanent magnet 3 with respect to the conducting wire W and the magnitude and direction of the force acting on the permanent magnet 3 in the x-axis direction. FIG. 8A is a contour diagram showing the output image of the simulation result in gray scale, and FIG. 8B is a contour diagram schematically showing the direction (color) of the force that cannot be expressed in gray scale with and without hatching for convenience. .. In FIG. 8B, a white area P1 without hatching indicates that a leftward force acts on the permanent magnet 3, and a hatched area P2 indicates that a rightward force is applied to the permanent magnet 3. It shows that it works. As shown by the broken line, among the four regions divided by the boundary of approximately 45 degrees with respect to the x-axis and the y-axis, they are arranged in the left and right regions P1 in FIG. 8 (white region P1 in FIG. 8B). A force in the left direction acts on the permanent magnet 3 as indicated by the white left arrow, and the permanent magnets 3 arranged in the upper and lower areas P2 in FIG. 8 (hatched area P2 in FIG. 8B). A force in the right direction acts on, as indicated by the white right arrow. As described above, in the regions P1 and P2, the directions of the forces acting on the permanent magnets 3 are opposite to each other. When vibrating the permanent magnet 3 of the power generation device 100 to generate power, it is preferable to use either one of the region P1 and the region 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 generating element in which the permanent magnet 3 is provided at the free end 1b of the cantilever 1 is as follows when the permanent magnet 3 is arranged above and below the conducting wire W in FIG. And (6). The governing equation when the permanent magnets 3 are arranged on the right and left sides of the conductor W, that is, on the x-axis is also expressed in the same manner.

FIG. 9 is a graph of simulation results showing the relationship between the arrangement and frequency of the permanent magnet 3, the resistance value of the load R, and the amount of power generation. The horizontal axis represents the frequency of alternating current, and the vertical axis represents the amount of power generation. The power generation amount when the magnetic dipole whose magnetic moment is oriented in the y-axis direction is arranged on the x-axis, on the right side of the conductor W or on the y-axis, below the conductor W in FIG. Based on the simulation. d is the distance between the conducting wire W and the surface of the permanent magnet 3 on the conducting wire W side. The calculation conditions are as follows. However, the diameter of the conductive wire W and the size of the permanent magnet 3 were treated as infinitesimally small.
Mass of permanent magnet 3: 1g
Current value (effective value): 10A
Distance between conductor W and permanent magnet 3: 10 mm
Electromechanical coupling coefficient: 5%
Resonant frequency of element: 60Hz
Non-linear spring constant of cantilever 1: k3=0
Capacitance of piezoelectric member 12: 170 nF
Resistance value of load R: 3 kΩ
Residual magnetic flux density: 1T
Mechanical quality factor (Q value): 100

The position and orientation of the permanent magnet 3 with respect to the conductor W will be described as “right side” and “lower side” of the conductor W with reference to FIG. 8. However, the position in the vertical direction or the horizontal direction with respect to the conductor W is Not necessarily a problem. The permanent magnet 3 is arranged on the right side of the conductor W by arranging the permanent magnet 3 so that the S pole 3b and the N pole 3a are arranged in a direction orthogonal to the radial direction of the conductor W and the flow direction of the alternating current. Means Arranging the permanent magnet 3 below the conducting wire W means a configuration in which the permanent magnet 3 is arranged so that the S pole 3b and the N pole 3a are arranged along the radial direction of the conducting wire W.

9A and 9B show simulation results for each of a plurality of load resistance values (100Ω, 300Ω, 1kΩ, 3kΩ, 10kΩ) when the permanent magnets 3 are arranged on the lower side and the right side of the conducting wire W, respectively. As shown in FIGS. 9A and 9B, the amount of power generation is maximum near the resonance frequency. Further, it can be seen that when the resistance value of the load R is 3 kΩ, the power generation device 100 and the load R are impedance-matched and the amount of power generation is maximum. Under the above conditions, there is almost no power generation due to the arrangement of the permanent magnets 3.

FIG. 10 is a graph of simulation results showing the relationship between the distance between the conducting wire W and the permanent magnet 3 and the amount of power generation. The horizontal axis represents the resistance value of the load R, and the vertical axis represents the power generation amount. 10A and 10B show simulation results when the permanent magnets 3 are arranged on the lower side and the right side of the conducting wire W under the same conditions as described above. However, as the frequency of the alternating current, the power generation amount is plotted by using the frequency at which the power generation amount becomes maximum at each resistance value.
When the distance between the conducting wire W and the permanent magnet 3 is 15 mm or more, the difference in the amount of power generation due to the arrangement of the permanent magnet 3 is small, but when the distance is 10 mm, the amount of power generation is a few% when the permanent magnet 3 is arranged on the right side. large. When the distance between the conducting wire W and the permanent magnet 3 is reduced to 5 mm, in the case where the permanent magnet 3 is arranged on the right side of the conducting wire W, the permanent magnet 3 collides with the conducting wire W and a simulation result cannot be obtained. ..

As described above, when the permanent magnet 3 is arranged below the conducting wire W, the problem of collision does not occur even if the permanent magnet 3 is brought close to the conducting wire W. As a result, the permanent magnet 3 is arranged on the right side of the conducting wire W. It is possible to obtain a large amount of power generation as compared with the case of performing.

FIG. 11 is a graph of simulation results showing the relationship between the distance of the permanent magnet 3 with respect to the conductor W and the amount of power generation and the amount of displacement. The horizontal axis represents the distance between the conductive wire W and the permanent magnet 3, the vertical axis in FIG. 11A represents the power generation amount, and the vertical axis in FIG. 11B represents the displacement amount. In each graph, the relationship between the distance and the power generation amount and the displacement amount is plotted for each different mechanical quality factor Q value (30, 50, 100, 200, 500). “Q value” in FIG. 11 indicates a mechanical quality factor. From the graph of FIG. 11, it can be seen that the power generation amount is proportional to the mechanical quality factor Q.
Further, from the graph of FIG. 11, it can be seen that when the distance between the permanent magnet 3 and the conducting wire W is 10 mm or more, the amount of power generation is inversely proportional to the fourth power of the distance between the permanent magnet 3 and the conducting wire W. However, when the distance between the permanent magnet 3 and the conducting wire W is less than 10 mm, the inverse proportional relationship begins to break down, and when the displacement amount of the permanent magnet 3 becomes about the same as the distance between the permanent magnet 3 and the conducting wire W, it becomes permanent. It can be seen that the amount of power generation and the amount of displacement decrease even when the magnet 3 is brought close to the conducting wire W. It is considered that this is because the amplitude of the permanent magnet 3 becomes large, the permanent magnet 3 vibrating in the region P2 shown in FIG. 8 enters the region P1, and a force in the opposite direction acts on the permanent magnet 3. ..
From the above results, when the lateral length of the permanent magnet 3, that is, the length in the x-axis direction, which is the vibration direction of the permanent magnet 3, is large, the permanent magnet is applied to a region where a force in the opposite direction that restricts vibration acts. It turns out that 3 becomes easy to enter. The lateral length of the permanent magnet 3 is preferably designed so that the permanent magnet 3 stays in the region P2.

FIG. 12 is a graph of simulation results showing the effect of the characteristics of the permanent magnet 3 on the amount of power generation. In the simulation, the resonance frequency was 49 Hz. The horizontal axis represents the frequency of alternating current, and the vertical axis represents the amount of power generation. FIG. 12A is a graph showing the relationship between the residual magnetic flux density (0.22T, 0.44T, 0.88T, 1.76T) of the permanent magnet 3 and the power generation amount, and FIG. 12B is the mass of the permanent magnet 3. It is a graph which shows the relationship between (0.5g, 1g, 2g, 4g, 8g) and the amount of power generation. In addition, when the mass of the permanent magnet 3 was changed, the value of the coefficient k1 was adjusted so that the resonance frequency did not change, and a simulation was performed. It can be seen from the graph shown in FIG. 12A that the amount of power generation is proportional to the square of the residual magnetic flux density. Further, from the graph shown in FIG. 12B, it is understood that the amount of power generation is proportional to the mass of the permanent magnet 3 under the condition where the resonance frequency is constant.

To summarize the above results, the parameter having a proportional relationship with the amount of power generation and the fourth power is the distance between the conducting wire W and the permanent magnet 3, and the proportional relationship with the square is the residual magnetic flux density of the permanent magnet 3. It can be seen that it is the mass of the permanent magnet 3 and the mechanical quality factor Q that have a linear relationship. In order to obtain a large amount of power generation, the power generation device 100 may be designed by giving priority to a parameter having a proportional relationship of the fourth power or the second power.
For example, when attaching a component to the free end 1b of the cantilever 1, it is desirable to use a component made of a magnetic material as much as possible. When a non-magnetic material part is attached to the free end 1b of the cantilever 1, it is considered that the amount of power generation increases in proportion to the mass of the cantilever 1, but the residual magnetic flux having a squared proportional relationship compared to the case where the magnetic material part is attached. The density is lowered, and as a result, the power generation characteristics are lowered.

Further, it is desirable that the permanent magnet 3 is arranged as close as possible to the conducting wire W so that the vibration direction of the permanent magnet 3 does not approach the conducting wire W.

Further, it is desirable to make the dimension of the permanent magnet 3 in the vibration direction short so that the force for suppressing the vibration does not act on the permanent magnet 3.

FIG. 13 is a schematic diagram showing an example of the arrangement posture of the permanent magnet 3. As a method of arranging the rectangular parallelepiped permanent magnets 3 having different three sides, there are three methods shown in FIGS. 13A to 13C. From the above point of view, even if the permanent magnets 3 shown in FIGS. 13A to 13C have the same volume and mass, the power generation amount is the largest in the arrangement posture shown in FIG. 13A, and FIGS. 13A, 13B, and 13C. It is considered that the power generation amount decreases in the order of.
That is, it is preferable that the thickness direction of the permanent magnet 3 faces the radial direction of the conductive wire W, and the long side direction of the permanent magnet 3 is arranged along the conductive wire W.

On the other hand, in order to prevent the force for suppressing the vibration from acting on the permanent magnet 3, it is desirable that the vibrating permanent magnet 3 is always in the region P2 shown in FIG. 8, and the width of the permanent magnet 3 in the vibration direction is It is understood that it is preferable to set within the range of the above formula (3).

FIG. 14 is a graph of simulation results showing the relationship between the thickness of the permanent magnet 3 and the amount of power generation. The horizontal axis represents the thickness of the permanent magnet 3, and the vertical axis represents the power generation amount. Consider a case where the permanent magnet 3 is arranged above the conducting wire W. When the distance between the center of the conductive wire W and the conductive wire side surface (lower surface) of the permanent magnet 3 is a, and the thickness of the permanent magnet 3 (width in the vertical direction) is d, the power generation amount P is expressed by the following formula (7). expressed.

However, it is assumed that the diameter of the conductor wire W is infinitely small and the amplitude of the permanent magnet 3 is sufficiently smaller than the distance a. FIG. 14 is a graph of the equation (7). From the graph of FIG. 14, it can be seen that the power generation amount is maximum when d≈a. The thickness d of the permanent magnet 3 capable of obtaining 90% or more of the maximum power generation is about 0.5a or more and 2a or less.

<Experimental results>
FIG. 15 is a schematic diagram showing an experimental power generator. The basic configuration of the experimental power generator is the same as that of the power generator 100 shown in FIG. 1 is different in that the lower end of the cantilever 1 is fixed by a fixing portion 2 so that the longitudinal direction is the vertical direction, but the direction of the magnetic force F acting on the permanent magnet 3 and the permanent magnet 3 are different. The directions of vibrations and directions of magnetic dipoles are the same, and in principle they can be regarded as the same structure. Note that FIG. 15 illustrates an example in which the permanent magnet 3 is arranged on the right side of the conducting wire W. When the permanent magnet 3 is arranged below the conducting wire W, the structure is substantially the same as that of the power generation device 100 shown in FIG. 1.
A bimorph element (PZBA00030 manufactured by FDK) in which PZT ceramics were adhered to both surfaces of a stainless substrate was used for the cantilever 1 which is a piezoelectric power generation unit. The length and width of the piezoelectric body are 48 mm and 20 mm, respectively. For the permanent magnet 3, Nd-Fe-B having a residual magnetic flux density of 0.43T was used. The volume and mass of the permanent magnet 3 are 250 mm ³ and 1.8 g, respectively.
Further, the mass and mounting position of the permanent magnet 3 were adjusted so that the resonance frequency of the element was about 50 Hz. In order to prevent the Q value from decreasing, the fixed end 1a of the piezoelectric bimorph element is fixed with a precision vise. The permanent magnet 3 is fixed so that the dipole faces downward. The capacitance of the piezoelectric member 12 is 140 nF. A resistor was connected as a load R to evaluate the amount of power generation. The resistance value of the load R which is impedance-matched was 24 kΩ from the relationship with the resonance frequency. The vibration amplitude of the permanent magnet 3 was measured using a laser displacement meter. The electromotive force generated in the load R was measured with a lock-in amplifier.

FIG. 16 is a graph of experimental results showing the relationship between the arrangement and frequency of the permanent magnet 3 and the amount of power generation. The horizontal axis represents frequency and the vertical axis represents power generation. 16A, 16B, and 16C show the relationship between the amount of power generation and the frequency when the permanent magnets 3 are arranged on the right side, the lower right side, and the lower side of the conducting wire W, respectively. The amount of current was changed to 0.06 A, 0.12 A, and 0.25 A, and the frequency dependence of the amount of power generation was examined near the resonance frequency of the element. The distance between the conducting wire W and the permanent magnet 3 was adjusted to be 6 mm and constant. The amount of power generation is maximized near the resonance frequency in all measurements. The permanent magnets 3 generate substantially the same amount of power at the right and lower positions with respect to the conductor W, whereas the amount of power generation decreases at the lower right position. It can be seen that when the permanent magnet 3 is arranged on the right side or the lower side of the conducting wire W in the above configuration, the power generation device 100 generates about 1 μW of electric power.

<Operation and effect of power generation device 100 according to the present embodiment>
As described above, according to the power generation device 100 according to the first embodiment, even if the frequency of the AC magnetic field formed around the conductor W is a low frequency of the order of 10 Hz, power generation is performed based on the AC magnetic field. be able to.

Further, it is possible to reliably avoid the collision between the vibrating permanent magnet 3 and the conducting wire W, and it is possible to efficiently generate electricity using the alternating magnetic field.

Furthermore, by arranging the permanent magnet 3 in a flat posture in the separating direction, each part of the permanent magnet 3 can be brought close to the conducting wire W, and power can be efficiently generated.

Furthermore, according to the present invention, by arranging each part of the permanent magnet 3 along the conducting wire W, each part of the permanent magnet 3 can be brought close to the conducting wire W, and efficient power generation can be achieved.

Furthermore, by setting the width of the permanent magnet 3 in the separating direction to be 0.5 times or more and 2 times or less the distance between the conducting wire W and the permanent magnet 3, it is possible to efficiently generate power.

Furthermore, at the stationary position of the permanent magnet 3 and at an arbitrary position during vibration, it is possible to prevent reverse force from acting on each part of the permanent magnet 3, and it is possible to efficiently generate power.

Furthermore, since no extra non-magnetic material part is provided, power can be efficiently generated.

Furthermore, with a simple configuration in which the permanent magnet 3 is provided at the free end 1b of the cantilever 1, it is possible to perform power generation using an alternating magnetic field.

Furthermore, by disposing the piezoelectric members 12 on both surfaces of the long plate portion 11 forming the cantilever 1, it is possible to efficiently generate power.

(Embodiment 2)
The power generator 200 according to the second embodiment is different from that of the first embodiment in the arrangement, posture, and vibration direction of the permanent magnet 3 with respect to the conducting wire W, and therefore the above differences will be mainly described below. Since other configurations and effects are similar to those of the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 17 is a front view showing the power generation device 200 according to the second embodiment. The permanent magnet 3 according to the second embodiment has an S pole 3b and an N pole 3a that are arranged in a direction of approximately 45 degrees with respect to the separating direction of the conductor W and the permanent magnet 3. The cantilever 1 is fixed to the fixed portion 2 so that the permanent magnet 3 vibrates in the direction in which the S pole 3b and the N pole 3a are arranged (the vertical direction in FIG. 17).

According to the power generation device 200 according to the second embodiment, similarly to the first embodiment, even if the frequency of the alternating magnetic field formed around the conducting wire W is a low frequency of the order of 10 Hz, it is formed around the conducting wire W. Electric power can be generated based on the alternating magnetic field.

Further, since the permanent magnet 3 vibrates at an angle of approximately 45 degrees with respect to the separating direction of the conductor wire W and the permanent magnet 3, by separating the permanent magnet 3 from the conductor wire W by a predetermined distance, the vibrating permanent magnet 3 and It is possible to avoid contact with the conductor wire W.

(Embodiment 3)
The permanent magnet 3 according to the third embodiment is different from that of the first embodiment in the arrangement, posture, and vibration direction of the permanent magnet 3 with respect to the conducting wire W, and therefore the differences will be mainly described below. Since other configurations and effects are similar to those of the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 18 is a front view showing the power generation device 300 according to the third embodiment. The permanent magnet 3 according to the third embodiment has an S pole 3b and an N pole 3a arranged in a direction orthogonal to the flow direction of the alternating current and the separating direction of the conducting wire W and the permanent magnet 3. The cantilever 1 is fixed to the fixed portion 2 so as to vibrate in the separating direction of the permanent magnet 3, that is, in the radial direction of the conducting wire W.

According to the power generation device 300 according to the third embodiment, similarly to the first embodiment, even if the frequency of the alternating magnetic field formed around the conducting wire W is a low frequency of the order of 10 Hz, it is formed around the conducting wire W. Electric power can be generated based on the alternating magnetic field.

(Embodiment 4)
In the permanent magnet 403 according to the fourth embodiment, the configurations of the permanent magnet 403 and the cantilever 401 are different from those in the first embodiment, and therefore the above-mentioned differences will be mainly described below. Since other configurations and effects are similar to those of the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 19 is a perspective view showing the power generation device 400 according to the fourth embodiment. The cantilever 401 has a posture in which the thickness direction of the long plate portion 11 intersects the radial direction of the conductor W and the flow direction of the alternating current, that is, the free end 1b is substantially orthogonal to the radial direction of the conductor W and the flow direction. It is fixed to the fixed portion 2 in a posture in which it is displaced.

The free end 1b of the cantilever 401 is provided with a permanent magnet 403 having a plurality of magnetic pole pairs 431, 432, 433. The free end 1b of the cantilever 401 is connected to the center of the permanent magnet 403. The permanent magnet 403 has a rectangular plate-shaped support plate 430 for supporting the plurality of magnetic pole pairs 431, 432, 433. The longitudinal direction of the support plate 430 faces the thickness direction of the long plate portion 11, and the support plate 430. Is fixed to the free end 1b of the cantilever 401 so that its thickness direction substantially coincides with the radial direction of the conducting wire W.

Magnetic pole pairs 431, 432, 433 magnetized in the thickness direction are provided on the support plate 430 at substantially the center and both ends thereof in the longitudinal direction. The magnetic pole pair 431 provided at the substantially central portion has an S pole on the conducting wire W side and an N pole on the anti-conducting wire side. The magnetic pole pairs 432 and 433 provided on both sides have an N pole on the conducting wire W side and an S pole on the anti-conducting wire side.

The three magnetic pole pairs 431, 432, 433 provided on the support plate 430 are arranged with a gap. The magnetic pole pair 431 arranged substantially in the center of the support plate 430 is arranged so that a force in the same direction acts when a current flows through the conductive wire W and the permanent magnet 403 vibrates. Specifically, as shown in FIG. 8, the magnetic pole pair 431 provided in the substantially central portion of the support plate 430 is located in the region P2, and the magnetic pole pairs 432 and 433 provided at both end portions of the support plate 430 are It is configured to be located in the region P1.

According to the power generation device 400 according to the fourth embodiment, the permanent magnet 403 having a plurality of sets of S poles and N poles is provided, and as described above, the S pole is prevented from acting on each part of the permanent magnet 403 in the opposite direction. By disposing the and N poles, it is possible to efficiently generate power.

Further, since the free end 1b of the cantilever 401 is connected to the central portion of the permanent magnet 403, the permanent magnet 403 can be supported by the elastic body in a well-balanced manner, and efficient power generation can be performed.

(Embodiment 5)
In the permanent magnet 503 according to the fifth embodiment, the configurations of the permanent magnet 503 and the cantilever 501 are different from those of the first embodiment, and therefore the above-mentioned differences will be mainly described below. Since other configurations and effects are similar to those of the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 20 is a perspective view showing the power generation device 500 according to the fifth embodiment. The power generation device 500 according to the fifth embodiment includes two cantilevers 501. The fixed end 1 a of each cantilever 501 is fixed to the upper and lower parts with the through hole 21 interposed therebetween. The long plate portion 11 of each cantilever 501 is fixed to the fixing portion 2 in a posture in which the thickness direction of the long plate portion 11 intersects the radial direction of the conductive wire W and the alternating current flow direction.

At the free end 1b of each cantilever 501, a permanent magnet 503 that surrounds the conducting wire W and has a substantially C shape in a front view and has N pole 503a and S pole 503b arranged in a radial direction is fixed. One end of a C-shaped permanent magnet 503 is fixed to the free end 1b of the first cantilever 501, and the other end of the permanent magnet 503 is fixed to the free end 1b of the second cantilever 501. ..

In the permanent magnet 503 configured in this way, by arranging the permanent magnet 503 widely along the circumferential direction of the conductor W, each part of the permanent magnet 503 can be brought close to the conductor W, and the efficiency can be improved by using an AC magnetic field. Can generate electricity.

According to the power generation device 500 according to the fifth embodiment, the permanent magnets 503 can be widely arranged along the circumference of the conducting wire W, and power can be efficiently generated.

(Embodiment 6)
In the sixth embodiment, the power generator 600 is different from the first embodiment in the configuration of converting the vibration energy of the permanent magnet 3 into the electric energy, and therefore the differences will be mainly described below. Since other configurations and effects are similar to those of the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 21 is a front view showing the power generation device 600 according to the sixth embodiment. For convenience of drawing, illustration of the fixed portion 2 is omitted. The power generation device 600 according to the sixth embodiment includes a fixing portion that fixes a cantilever 601 as an elastic body and a fixed end 1a (first portion) of the cantilever 601 to a conductor W through which an alternating current of low frequency on the order of 10 Hz flows. 2, a permanent magnet 3 provided at the free end 1b (second portion) of the cantilever 601, an electret generator 605 that converts the vibration energy of the permanent magnet 3 into electric energy, and the electricity converted by the electret generator 605. The output part 4 which outputs energy is provided.

The electret generator 605 is provided in place of the piezoelectric member 12 of the first embodiment, and is a device that converts the vibration energy of the permanent magnet 3 into electric energy. The electret generator 605 includes a first electrode substrate 651 having a plurality of electrets 651a, and a conductive second electrode substrate 652 having a plurality of counter electrodes 652a facing the respective electrets 651a. The electret 651a is a charged body that stores electric charges. The electret 651a semi-permanently holds an electric charge and forms an electric field. The first electrode substrate 651 is fixed to the permanent magnet 3 in such a posture that a plurality of electrets 651 a are arranged in the vibration direction of the permanent magnet 3.

The second electrode substrate 652 is fixed such that the position with respect to the conducting wire W does not change in a posture in which the plurality of counter electrodes 652a face the plurality of electrets 651a, respectively. For example, the second electrode substrate 652 is fixed to the fixed portion 2. The counter electrode 652a is a conductive member, and charges are stored by electrostatic induction.

The permanent magnet 3 vibrates in the lateral direction in FIG. 21 due to the AC magnetic field formed around the conducting wire W. When the permanent magnet 3 vibrates, the relative position between the electret 651a and the counter electrode 652a changes, and the charge moves. In this way, the electret generator 605 can convert the vibration energy of the permanent magnet 3 into electric energy, and the voltage generated by the movement of the charges is output from the output unit 4.

According to the power generator 600 of Embodiment 6, even if the frequency of the AC magnetic field formed around the conducting wire W is a low frequency of the order of 10 Hz, it is possible to generate power based on the AC magnetic field.

In the sixth embodiment, the example in which the piezoelectric member 12 of the first embodiment is replaced with the electret generator 605 has been described, but the piezoelectric member 12 according to the second to fifth embodiments may be replaced with an electret generator. Further, although the example in which the first electrode substrate 651 is provided on the permanent magnet 3 and the second electrode substrate 652 is fixed to the conducting wire W has been described, the second electrode substrate 652 is provided on the permanent magnet 3 and the first electrode substrate 651 is provided. May be fixed to the conductor W.

Although the electret generator 605 has been described as an alternative means of the piezoelectric member 12, a known generator capable of converting the vibration energy of the permanent magnet 3 into electric energy, such as a generator having a magnetostrictive element, is used instead of the piezoelectric member 12. Is also good.

(Embodiment 7)
FIG. 22 is a block diagram showing the voltage adjustment device according to the seventh embodiment. The voltage adjusting device according to the seventh embodiment includes a voltage adjusting device 706 for adjusting the voltage of the conductor W connected to the system, a detecting device 707 for detecting the state of the voltage adjusting device 706, and the detecting device 707. A transmission device 708 that wirelessly transmits the detected detection information to the outside. The voltage regulator 706 is, for example, an SVR (Step Voltage Regulator), an SVC (static var compensator), or the like.
The detection information is the voltage, current, voltage adjustment content, etc. on the upstream and downstream sides of the voltage regulator 706.

The transmission device 708 according to the seventh embodiment is driven by the power generation device 100 according to the first embodiment and the power output by the power generation device 100, and wirelessly transmits a signal related to the detection information detected by the detection device 707. Section 781. The power generation device 100 generates power based on the AC magnetic field formed around the conducting wire W and outputs a voltage to the transmission unit 781, and the transmission unit 781 is driven by the voltage output from the power generation device 100.

According to the voltage regulator of the seventh embodiment, the transmitter 781 can be driven using the voltage output by the power generator 100. Therefore, the power generation device 100 and the transmission unit 781 are arranged on the side where the voltage regulator 706 provided in the middle of the power transmission line cannot provide a power source, and the information related to the voltage regulator 706 is wirelessly transmitted to the outside. Can be sent.

In addition, in the seventh embodiment, an example including the power generation device 100 according to the first embodiment has been described, but needless to say, using the power generation devices 200, 300, 400, 500 according to the second to sixth embodiments, The voltage adjusting device according to the seventh embodiment may be configured.
Although the cantilever 1 is illustrated as a structure for movably supporting the permanent magnet 3, the supporting mechanism is not particularly limited to the cantilever 1 as long as the permanent magnet 3 can be moved by an oscillating magnetic field.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above meaning but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

100 generator, 1 cantilever, 1a fixed end, 1b free end, 2 fixed part, 3 permanent magnet, 4 output part, W conducting wire

Claims (21)

A permanent magnet displaceably provided with respect to the conducting wire through which the alternating current flows,
When the permanent magnet vibrates due to an AC magnetic field formed around the conductor, a conversion unit that converts the vibration energy of the permanent magnet into electric energy.
An output unit configured to output the electric energy converted by the conversion unit. The permanent magnet is
The power generator according to claim 1, which has an S pole and an N pole arranged in a non-orthogonal direction with respect to a separating direction of the conductive wire and the permanent magnet, and vibrates in a direction intersecting with a flowing direction of an alternating current and the separating direction. .. The permanent magnet is
The power generator according to claim 2, which has an S pole and an N pole arranged in a separating direction of the conducting wire and the permanent magnet, and vibrates in a direction orthogonal to an alternating current flowing direction and the separating direction. The power generator according to claim 3, wherein the width of the permanent magnet in the vibration direction satisfies the following formula.
w≦2 (d−√2a)
However,
w: width of the permanent magnet in the vibration direction d: distance between the center of the conductive wire and the permanent magnet a: amplitude of the permanent magnet The power generator according to claim 3 or 4, wherein a width of the permanent magnet in the separating direction is 0.5 times or more and 2 times or less of a distance between the center of the conductive wire and the permanent magnet. The permanent magnet is
It has an S pole and an N pole which are orthogonal to the flow direction of the alternating current and which are arranged in a direction of about 45 degrees with respect to the separating direction of the conducting wire and the permanent magnet, and vibrate in the arrangement direction of the S pole and the N pole. The power generator according to claim 1. The permanent magnet is
The power generator according to claim 1, which has an S pole and an N pole arranged in a direction orthogonal to a flow direction of an alternating current and a separating direction of the conductive wire and the permanent magnet, and vibrates in the separating direction. The permanent magnet is
The power generation device according to claim 3, wherein a plurality of sets of S poles and N poles arranged in the vibration direction are provided, and the S poles and N poles arranged in the vibration direction are arranged such that adjacent poles have different polarities. The permanent magnet is
The power generator according to claim 3, which has a C shape surrounding the conductor, has S poles and N poles arranged in a radial direction, and vibrates in the circumferential direction of the conductor. The permanent magnet is
The power generator according to any one of claims 1 to 9, wherein the conductor and the permanent magnet are flat in a separating direction. The power generator according to any one of claims 1 to 10, wherein the permanent magnet has a longitudinal direction along the lead wire. The permanent magnet is
The power generator according to any one of claims 1 to 11, wherein each unit has a size that receives a magnetic force in the same direction at least at a vibration center position. The permanent magnet is
The power generator according to any one of claims 1 to 12, wherein each unit has a size that receives a magnetic force in the same direction at an arbitrary vibration position. An elastic body,
A fixing portion for fixing the first portion of the elastic body to a conducting wire through which an alternating current flows,
The permanent magnet is
It is provided in the second portion of the elastic body whose position with respect to the conducting wire is changed by an external force,
The conversion unit is
A piezoelectric member provided on the elastic body,
The alternating magnetic field formed around the conductor wire vibrates the permanent magnet, and the voltage generated in the piezoelectric member by the vibration of the permanent magnet is output from the output unit. The power generator according to claim 1. The power generator according to claim 14, wherein the elastic body does not have any structure other than the permanent magnet in the second portion. The power generator according to claim 14 or 15, wherein the second portion of the elastic body is connected to a central portion of the permanent magnet. The power generator according to any one of claims 14 to 16, wherein the elastic body is a cantilever. The elastic body has a long plate portion,
The power generation device according to claim 17, wherein the piezoelectric members are plate-shaped and are arranged on both surfaces of the long plate portion. The conversion unit is
An electret generator having a first electrode substrate having an electret and a conductive second electrode substrate having a counter electrode facing the electret, and comprising an electret generator for converting vibration of the permanent magnet into electric energy. The power generator according to claim 13. A power generator according to any one of claims 1 to 19,
And a transmitter for transmitting a signal,
The transmitter is
A transmitter that is driven by the voltage output from the power generator. Prepare a permanent magnet that is displaceable with respect to the conductor through which alternating current flows,
Vibrating the permanent magnet by an alternating magnetic field formed around the conductor,
The vibration energy of the permanent magnet is converted into electric energy,
A power generation method of outputting electric energy converted by vibration of the permanent magnet.