JP2015154681A - Power generation device and method, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation device and method capable of widening an application range and collecting power as efficiently as possible, and an electronic apparatus employing the same.SOLUTION: A power generation device 1 includes a helical spring 10 and a winding coil 21 as a conductor 20 for converting a variable magnetic field that is generated by applying pressure from the outside to the helical spring 10, into electricity. The pressure from the outside is applied to the helical spring 10 while interposing a magnet 30, the magnet 30 is displaced relatively to the winding coil 21, and the winding coil 30 converts both a variable magnetic field caused by the displacement of the magnet 30 and a variable magnetic field caused by the deformation of the helical spring into electricity. The converted electricity is supplied to a load 40 to be functioned as an electronic apparatus.

Description

  The present invention relates to a power generation apparatus and method for generating electric power by external pressure, and an electronic apparatus including the power generation apparatus.

  In recent years, small electronic devices that operate with low power consumption have been rapidly developed. As a power source of such an electronic device, a technique related to vibration power generation that extracts power from vibration has been attracting attention. The vibration power generation includes an inverse magnetostriction method (for example, Patent Document 1), an electret method, a piezoelectric method, an electromagnetic induction method (for example, Patent Document 2), and the like depending on a vibration recovery method.

  In the vibration power generator disclosed in Patent Document 1, a magnetic field that fluctuates is generated by vibrating a magnetostrictive rod made of a magnetostrictive material by applying stress in an axial direction or a perpendicular direction. In the vibration generator disclosed in Patent Document 2, electric power is extracted by the relative movement of a coil conductor made of a non-magnetic material in the magnetic field of a rod-shaped permanent magnet.

WO2011 / 158473 Publication JP 2012-034475 A

  In the vibration of a rod-shaped body such as a magnetostrictive rod or a rod-shaped permanent magnet as disclosed in Patent Document 1 or Patent Document 2, it may be difficult to recover the vibration of a vibration source that vibrates in a random direction. The applied mechanical strength limits the applied stress.

  Therefore, an object of the present invention is to provide a power generation apparatus and method that can recover power as efficiently as possible with a wide application range, and an electronic device using the power generation apparatus and method.

In order to achieve the above object, the present invention employs the following technical means.
[1] a spiral spring;
A conductor for converting a fluctuating magnetic field generated by pressure applied to the spiral spring from the outside into electricity;
A power generation device.
[2] The conductor is a winding coil wound in a coil shape.
[3] The winding coil is coaxially provided on at least one of an inner periphery and an outer periphery of the spiral spring.
[4] Furthermore, a magnet is provided so as to magnetize the spiral spring.
[5] The winding coil is provided by being insulated and wound around the spiral spring.
[6] An electronic device comprising: the power generation device; and an electronic component that operates by receiving power supplied from the power generation device.
[7] A power generation method in which a fluctuating magnetic field is generated by applying pressure to the spiral spring from the outside, and the conductor converts the generated fluctuating magnetic field into electricity and outputs the electricity.
[8] A winding coil wound in a coil shape is used as the conductor.
[9] Pressure from the outside is applied to the spiral spring through a magnet, and the magnet is displaced with respect to the winding coil.
The winding coil converts both the variable magnetic field generated by the displacement of the magnet and the variable magnetic field generated by the deformation of the helical spring into electricity.
[10] An external pressure applied to the spiral spring is a vibration pressure.

  The present invention can recover vibration energy by converting it into electric energy even for random vibrations that are not necessarily periodic compared to the means and methods of magnetic field generation used in conventional vibration power generation. Further, it is possible to provide a power generation apparatus and a power generation method that are not easily damaged by fatigue even when deformation is caused by stress.

It is a figure for demonstrating the electric power generation method which concerns on 1st Embodiment as a basic concept common to each embodiment of this invention. It is a figure for demonstrating the electric power generation method which concerns on 2nd Embodiment as an application form of 1st Embodiment. It is a figure for demonstrating the electric power generation method which concerns on 3rd Embodiment as an application form of 1st and 2nd embodiment. It is a figure for demonstrating 4th Embodiment as a modification of 1st Embodiment. It is a figure for demonstrating 5th Embodiment as a modification of 4th Embodiment. It is a figure for demonstrating 6th Embodiment as a modification of 2nd Embodiment. It is a figure for demonstrating the form of arrangement | positioning of a winding coil as other embodiment. It is a figure for demonstrating the form of arrangement | positioning of the winding coil different from FIG. It is a figure which shows embodiment which a helical spring has a different shape as other embodiment. It is a block block diagram of the electronic device which concerns on embodiment of this invention. Regarding the results of Example 1, (a) to (e) are diagrams showing output results from the winding coils when the deformation amount of the spiral spring is 20 mm, 21 mm, 28 mm, 30 mm, and 33 mm. It is a figure which shows the electric power generation voltage with respect to the deformation | transformation amount of a helical spring regarding the result of Example 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the embodiment and can be changed as appropriate. In particular, the shape, dimensions, positional relationship, and the like of each member described in the drawings merely show conceptual matters, and can be changed according to the application scene. In the drawings, the same or corresponding members and units are denoted by the same reference numerals.

(First embodiment)
FIG. 1 is a diagram for explaining a power generation method according to the first embodiment as a basic concept common to the embodiments of the present invention.

  The power generation method according to the first embodiment of the present invention is realized by, for example, the power generation device 1 shown in FIG. 1, and the power generation device 1 includes a spiral spring 10 that generates a variable magnetic field by external pressure, particularly vibration pressure. And a conductor 20 for converting a fluctuating magnetic field generated by the spiral spring 10 into electricity. The conductor 20 is shown by a winding coil 21 wound in a coil shape in FIG. By winding the conductor 20 in a coil shape, a variable magnetic field generated when external pressure is applied to the spiral spring 10 is converted into electricity as efficiently as possible.

  Here, since the spiral spring 10 generates a varying magnetic field, it may be called “magnetic field generating means”, and the conductor 20 may be called “conversion means” because it converts the varying magnetic field into electricity. In FIG. 1, the spiral spring 10 and the winding coil 21 are schematically shown in cross section. The same applies to the other drawings.

  In particular, the spiral spring 10 and the winding coil 21 are coaxially arranged, and the winding coil 21 is provided around the outside of the spiral spring 10. This is suitable when a large variable magnetic field is generated outside the spiral spring 10 by applying pressure from the outside to the spiral spring 10.

  The spiral spring 10 is made of, for example, a magnetic material. When pressure is applied to the spiral spring 10 from the outside, stress is generated in the spring, and the magnetic permeability of the material constituting the spring is changed. As a result, the magnetic flux density in the spiral spring 10 and the surrounding space is changed over time. Changes. That is, a variable magnetic field is generated in the spiral spring 10 and the space around it. The conductor 20 takes out this fluctuating magnetic field as electric energy.

  In the first embodiment of the present invention, the spiral spring 10 receives a pressure from the outside, particularly a vibration pressure, and generates a variable magnetic field. The spiral shape is excellent in compactness and has a characteristic of efficiently absorbing external pressure. The elastic coefficient and the frequency are arbitrarily set according to the environment in which the power generation device 1 is used. The range of stress is also highly applicable. The spiral spring 10 also has vibration damping properties. Whether it is a pulse pressure, a vibration pressure that is a continuous pressure, or a pressure that is discontinuous in pulse width, period, or magnitude, its mechanical energy is efficiently converted into magnetic energy. Can be converted.

  Here, the “spring” includes a plate-like spring in addition to a spiral spring called a spring coil. However, if it is a spiral, not only the axial direction of the spiral but also a plane parallel to the axis is parallel. It is relatively easy to vibrate in the direction as well.

  In addition, as in Patent Document 1, the rod-like body may be vibrated up and down or left and right, but even in these cases, the direction of vibration of the rod-like body is limited and the vibration is efficiently absorbed. I can't. Furthermore, although there is a method of absorbing vibration by fixing one end portion such as a cantilever, as in the case of a rod-like body, the direction of the pressure applied to the cantilever is limited, and the pressure cannot be absorbed efficiently. Further, compared to the spiral spring 10 that vibrates in the axial direction and is excellent in compactness, the cantilever type vibration receiving body is separated from the free end to which pressure is applied and the fixed end, and the compactness is not excellent.

  In addition, since the external pressure is applied to the spiral spring 10, not only the external pressure is absorbed efficiently, but also there is no stress concentration, and fatigue failure occurs with respect to the external pressure. It is hard to do.

  Here, the winding coil 21 includes a spiral portion 21 a and a lead portion 21 b, and FIG. 1 shows a case where the length of the spiral portion 21 a is shorter than the free height of the spiral spring 10. However, the spiral portion 21 a may be arranged at a position where the length is equal to the free height of the spiral spring 10 and corresponding to the spiral spring 10. The spiral portion 21 a may be longer than the spiral spring 10. A load 40 that operates with small electric power is connected to both ends of the lead portion 21b, and the load 40 operates upon receiving the electric power generated by the power generation device 1. In addition, one end of the spiral spring 10 is a free end and the other end is a fixed end, but both ends of the spiral spring may be free ends.

  In the power generation device 1, as shown by a one-dot chain line in FIG. 1, a winding coil 21 is wound around a cylindrical holder 51, a spiral spring 10 is arranged in the holder 51, and a pair of stages 52, 52 is arranged on both sides thereof. You may comprise by providing. With this configuration of the power generation device 1, external pressure can be efficiently applied to the spiral spring 10, and the device can be easily manufactured and downsized.

(Second Embodiment)
FIG. 2 is a diagram for explaining a power generation method according to the second embodiment as an application of the first embodiment. The power generator 1 shown in FIG. 2 differs from that shown in FIG. 1 in the following points. A permanent magnet is provided as a magnet 30 at at least one of the ends of the spiral spring 10. The spiral spring 10 is magnetized by the magnet 30. The magnetization direction may be along the axial direction of the winding coil 21, for example, or may not be along. Even when the magnetization direction is along the axial direction of the winding coil 21, the magnets 30 are arranged on one end and the other end of the spiral spring 10 with the same poles facing each other so that the magnets 30 repel each other. May be. In this case, the spiral spring 10 is pulled by the force of the magnet 30. Conversely, the magnets 30 may be arranged at one end and the other end of the spiral spring 10 with the different polarities facing each other such that the magnets 30 exert an attractive force. The spiral spring 10 is compressed by the force of the magnet 30.

  In the second embodiment, since the magnet 30 is provided on at least one or both of one end of the spiral spring 10 and the other end of the spiral spring 10, pressure is applied to the spiral spring 10 from the outside. When applied, the direction of the varying magnetic field is controlled, and as a result, an induced current flows through the winding coil 21 and can be converted into electricity. That is, in the second embodiment, a large amount of electric power can be generated as compared with the first embodiment by the inverse magnetostriction effect of the magnets installed at one or both of the upper end and the lower end and the spiral spring 10. it can.

(Third embodiment)
FIG. 3 is a diagram for explaining a power generation method according to the third embodiment as an application of the first and second embodiments. In the power generator 1 according to the third embodiment, the height of the spiral portion 21a of the winding coil 21 is at least the same position as or higher than one end (upper end in the drawing) of the spiral spring 10. As a result, as the magnet 30 provided at the upper end of the spiral spring 10 is displaced by the external pressure, a varying magnetic field due to the displacement of the magnet 30 is applied to the winding coil 21, and an induced current flows. Moreover, if the magnet 30 is provided also at the other end (the lower end in the figure) of the spiral spring 10, it can be converted into electricity more efficiently. As a result, the third embodiment can efficiently convert the energy applied by the external pressure more than the second embodiment into electric energy.

(Fourth embodiment)
FIG. 4 is a diagram for explaining a fourth embodiment as a modification of the first embodiment. The power generation device 1 according to the fourth embodiment is different from the power generation device 1 according to the first embodiment in the following points. In the fourth embodiment, the winding coil 21 is arranged coaxially around the circumference inside the spiral spring 10. When a pressure from the outside is applied to the spiral spring 10, a fluctuating magnetic field is generated. When the fluctuating magnetic field is generated relatively strongly inside the spiral spring 10, the spiral spring is more effective than the case where the winding coil 21 is provided outside the spiral spring 10 as shown in FIGS. If the winding coil 21 is provided on the inner side of the motor 10, it can be efficiently converted into electricity.

  In the fourth embodiment, the winding coil 21 is an intermediate portion between the upper end and the lower end of the spiral spring 10 so that the winding coil 21 is not deformed even when external pressure is applied to the spiral spring 10. Is provided.

(Fifth embodiment)
FIG. 5 is a diagram for explaining a fifth embodiment as a modification of the fourth embodiment. The power generation device 1 according to the fifth embodiment is different from the power generation device 1 according to the fourth embodiment in the following points. In the fifth embodiment, permanent magnets as magnets 30 are arranged at both ends of the spiral spring 10. The spiral spring 10 is magnetized by the magnet 30, and the spiral spring 10 can receive a pressure from the outside and efficiently generate a variable magnetic field. Since the magnets 30 are arranged at both ends of the spiral spring, it is considered that a bias is applied by the magnets 30 to generate a large variable magnetic field. The winding coil 21 is coaxially disposed inside the spiral spring 10 in common with the fourth embodiment. The distance between the ends of the spiral spring 10 is determined by the winding coil. The height of the coil 21 is substantially the same. Therefore, when the helical spring 10 is compressed by external pressure, the winding coil 21 is simultaneously deformed and displaced in the varying magnetic field. Therefore, the winding coil 21 converts a variable magnetic field generated when the spiral spring 10 receives pressure from the outside into electricity, and an induced electromotive force is generated when the winding coil 21 is displaced in the magnetic field.

  In the fifth embodiment, the magnet 30 is arranged at each end of the spiral spring 10, but even without the magnet 30, the spiral spring 10 receives an external pressure to generate a variable magnetic field, and the fluctuation Since the winding coil 21 is deformed in the magnetic field, an induced electromotive force is generated in the winding coil 21.

(Sixth embodiment)
FIG. 6 is a diagram for explaining a sixth embodiment as a modification of the second embodiment. In the power generator 1 according to the sixth embodiment, not only the winding coil 21 is coaxially provided outside the spiral spring 10 but also the winding coil 22 spirals inside the spiral spring 10. The spring 10 is provided so as to intersect with the axis of the spring 10, and preferably to be orthogonal thereto. In the first to fifth embodiments, there is one winding coil. However, as in the sixth embodiment, a plurality of winding coils are provided, and the axes of the winding coils 21 and 22 intersect each other, preferably You may provide so that it may orthogonally cross. The plurality of winding coils 21 and 22 are provided inside and outside the spiral spring 10 so that the axes of the plurality of winding coils 21 and 22 intersect each other. Then, even when the pressure applied from the outside to the spiral spring 10 is not along the axial direction of the spiral spring 10, for example, even when it is a roll pressure or vibration pressure, each axis of the varying magnetic field It can be converted into electricity corresponding to the components. Therefore, power can be generated more efficiently by receiving vibration in an arbitrary direction. In particular, a so-called torsion spring may be used as the spiral spring 10.

  Further, a pair of magnets 31 and 32 may be provided so as to correspond to one or both axes of the winding coils 21 and 22, respectively, and the direction in which the varying magnetic field is generated may be controlled.

(Other Embodiments Regarding Arrangement of Winding Coil as Conductor)
In the first to sixth embodiments, in particular, paying attention to the power generation method, a magnetic field is generated by applying external pressure to the spiral spring 10, and this magnetic field is electrically generated by the winding coil 21 as the conductor 20. , A superposed method in which an induced electromotive force is generated in the conductor 20 when the conductor 20 is deformed and displaced in the magnetic field, and a permanent magnet or an electromagnet as the magnet 30 is taken in and out of the winding coil 21. A method of converting a varying magnetic field generated by this into electricity using a coil conductor as the conductor 20 is described.

  Various coil conductors other than those shown in FIGS. 1 to 5 are conceivable. FIG. 7 and FIG. 8 are diagrams for explaining the arrangement of the winding coils as another embodiment. In the form shown in FIG. 7, a conductor coated with insulation is used as the winding coil 21, and the winding coil 21 is directly wound around the spiral spring 10. When pressure from the outside is applied to the spiral spring 10, the spiral spring 10 is compressed on one of the inner side and the outer side and pulled on the other to generate a variable magnetic field. This is because the winding magnetic field 21 as a conductor for converting the fluctuation magnetic field to electricity is arranged in a region as close as possible because the fluctuation magnetic field is assumed to fluctuate greatly near the spring 10.

  Moreover, you may improve the form of arrangement | positioning of the winding coil shown in FIG. 6 as follows. In FIG. 6, the winding coil 22 is completely accommodated in the hollow of the spiral spring 10, but one winding of the winding coil 22 is provided so as to protrude in the axial direction of the spiral spring 10. Also good. That is, the winding coil 22 has an axis oriented in a direction crossing the axis of the spiral spring 10, and passes through the hollow portion of the spiral spring 10 from one of the upper and lower sides of the spiral spring 10. 10 turns up and down on the other upper and lower sides of the spiral spring 10, passes through the hollow portion of the spiral spring 10, and reaches one of the upper and lower sides of the spiral spring 10. Is provided. This is effective when the amount of change in the varying magnetic field generated when external pressure is applied to the spiral spring 10 is large in the region where the winding coil 22 is provided.

  In the form shown in FIG. 8, the axis of the winding coil 21 is unevenly distributed at a position that intersects the axis of the spiral spring 10 at a twisted position. In the case where the fluctuating magnetic field due to the spiral spring 10 changes greatly in this unevenly distributed region, this arrangement method can be efficiently converted into electricity. This form is suitable when a so-called torsion spring is used as the spiral spring 10.

  The conductor 20 and the winding coil may be arranged not only in the winding coil 21 but in a region where the variable magnetic field changes as much as possible by applying external pressure to the spiral spring 10. This is because vibration energy can be converted into electric energy as efficiently as possible.

(Other embodiments regarding the shape of the spiral spring)
In the first to sixth embodiments, the spiral spring 10 has both ends spirally wound at a predetermined pitch, and has a shape in which external pressure is directly applied to each end. . Such a shape is preferable when external pressure is applied to the spiral spring 10 in a straight line, but it is also assumed that external pressure is applied while rotating. Therefore, the shape of the spiral spring 10 can be selected in accordance with how external pressure is applied.

  FIG. 9 is a diagram showing an embodiment in which a spiral spring has a different shape as another embodiment. The spiral spring 10 includes a spiral main body portion 10a, an extending portion 10b extending linearly from one end of the main body portion 10a, and an extending portion 10c extending linearly from the other end of the main body portion 10a. The extending portion 10b and the extending portion 10c extend in different directions. When pressure or vibration is applied between the extending portion 10b and the extending portion 10c to generate rotational torque, the magnetic permeability changes because tensile or compressive stress is applied to the main body portion 10a of the spiral spring 10. However, a variable magnetic field is generated around the spiral spring and its surroundings. Therefore, this variable magnetic field is converted into electricity by the winding coil 21. The winding coil 21 is arranged as shown in FIG. 7, but may be in other embodiments.

(Material of spiral spring)
Next, the spiral spring 10 described above will be specifically described. The spiral spring 10 is preferably made of a magnetic material, preferably a ferromagnetic material. However, if the ferromagnetic material is magnetized, it can be applied even when the ferromagnetic material has no inverse magnetostriction effect or has an inverse magnetostriction effect but the effect is small.

Examples of the ferromagnetic material having no magnetostrictive effect include an FeNi alloy such as an Fe ₁₅ Ni ₈₅ alloy. As a ferromagnetic material having a small magnetostriction effect, for example, a ferromagnet having a dimensional change rate λ of less than 50 ppm, more preferably less than 20 ppm, and even less than 10 ppm, pure Fe (λ = 6 ppm) is exemplified.

  Here, when the spiral spring 10 is made of a magnetostrictive material, the dimensional change rate λ≡Δl / l of the magnetostrictive material due to the magnetic field applied to the magnetostrictive material (where l is the length of the magnetostrictive material before the dimensional change of the magnetostrictive material). Is greater). Δl / l is a value of about 6 ppm for Fe, 100 ppm for an Fe—Co alloy, 300 ppm for an iron gallium alloy, and about 2000 ppm for Terphenol D.

  When the ferromagnetic material has an inverse magnetostriction effect, a variable magnetic field is generated by the inverse magnetostriction effect only by vibrating the helical spring without magnetizing the ferromagnetic material. If the inverse magnetostriction effect is large, the variable magnetic field also changes greatly, so that the amount of power to be converted increases. The dimensional change rate λ (ppm) of the ferromagnetic material is preferably 50 or more, for example, and the dimensional change rate λ of the ferromagnetic material is more preferably 100 ppm or more, and further preferably 1000 ppm or more.

  The elastic constant (Young's modulus) of the magnetostrictive material is an element that affects the dimensional change rate of the magnetostrictive material due to the magnetic field applied to the magnetostrictive material. Fe is 200 GPa, Fe—Co alloy is 180 GPa, iron-gallium alloy is 70 GPa, iron— It is about 200 GPa for cobalt-vanadium alloy and about 30 GPa for terphenol D.

  As a ferromagnetic material, since it is easily magnetized and has a magnetostrictive effect, it contains at least one metal of iron, cobalt, nickel, aluminum, gallium, indium, thallium, neodymium, samarium, terbium and dysprosium. preferable.

  In particular, the ferromagnetic material is preferably, for example, an alloy containing one or both of Fe and Co, and more preferably an alloy of Fe and Co.

(Vibration used)
The vibration applied to the spiral spring may be periodic vibration or sudden and non-periodic vibration. Examples of the periodic vibration include vibration generated during operation of various machines.
On the other hand, the non-periodic vibration includes, for example, vibration generated when a person or animal walks on the ground or floor.

  When the vibration direction applied to the spiral spring 10 is uniquely determined, the direction of the vibration may be arranged so as to be the axial direction of the spiral spring 10. On the other hand, since it is difficult to arrange the spiral spring shaft along the vibration direction against irregular vibrations that exist in nature, for example, as described with reference to FIG. The power generator 1 provided with the wire coils 21 and 22 may be employed. Each embodiment of the present invention is applied to various vibrations such as irregular vibrations of air accompanying the passage of wind, vibrations of water accompanying the flow of water, and waves generated on the surface of a lake or sea.

  In addition, as vibration, there are a type that reciprocates linearly and a type that rotates. In the linear motion type, vibration is transmitted to the spiral spring through the upper and lower plates 52 as shown in FIGS. On the other hand, in the type which rotates, it is transmitted to a spiral spring 10 provided with a main body portion 10a and extending portions 10b and 10c as shown in FIG.

  Among the helical springs 10, so-called “torsion springs” and “torsion springs” that are used to receive a torsional moment around an axis and mainly deform perpendicularly to the central axis direction (longitudinal direction). The spiral spring that is called is preferable from the viewpoint that it can be designed to be lightweight because it has a large energy that can be stored with the same weight.

(Electronics)
Electronic equipment using the power generation device according to each embodiment of the present invention will be described. FIG. 10 is a block configuration diagram of an electronic device according to the embodiment of the present invention. The electronic device 5 includes a power generation device 1 and a unit 6 as a load that operates by electric power output from the conductor 20 in the power generation device 1, preferably the lead portion 21 b of the winding coil 21. Each unit 6 is an electronic component that operates instantaneously with small electric power by the power generation device 1. As electronic parts, for example, they are installed on artificial objects such as various civil engineering buildings such as bridges and tunnels. It has a function to transmit the state. Accordingly, the electronic device 5 can be operated without power supply by wire or wireless. In addition, when current and voltage are insufficient in one power generation device 1, a plurality of power generation devices 1 may be connected in series or in parallel.

  Although various embodiments of the present invention have been described above, if the basic concept described in the first embodiment is provided, the thickness of the material of the spiral spring 10, the diameter, and the length of the spiral spring 10 are described. In addition, the thickness and length of the conductor 20, the thickness of the wire used in the winding coil 21, the diameter and length of the winding coil 21 should be appropriately set according to the required output size. Can do. At that time, it is preferable to perform impedance matching with the load 40 connected to the winding coil 21.

  A spiral spring 10 having a spring diameter of 10 mmφ, a spring length of 60 mm, and a spring wire thickness of 1 mm was produced using a steel wire spring (Fe60C) as a raw material. As shown in FIG. 3, a winding coil 21 is provided outside each helical spring 10 by winding an enameled wire having a thickness of 0.2 mm to a diameter of 14 mmφ to a winding height of 140 mm. At that time, the spiral spring 10 and the winding coil 21 are coaxial, and the spiral spring 10 and the winding coil 21 have the same lower end in the height direction. The resistance of the winding coil 21 was about 80Ω. Using a neodymium magnet of 10 mmφ × 2 mmt as the magnet 30, the magnets 30 were arranged up and down as shown in FIG. A reciprocating motion was performed from above the spiral spring 10 at a linear motion speed of 600 mm / s. In Example 1, the moving amount ΔL of the magnet 30 provided at the upper end of the spiral spring 10 was changed from 10 mm to 33 mm. The spiral spring 10 is deformed by this movement amount ΔL. The spiral spring 10 was forcibly vibrated so as to be deformed by the movement amount ΔL, and the output from the winding coil 21 was measured. At that time, the load resistance was 1 MΩ.

  FIG. 11 shows the results of the first embodiment, and FIGS. 11A to 11E show the output results from the winding coil 21 when the deformation amount of the spiral spring is 20 mm, 21 mm, 28 mm, 30 mm, and 33 mm. It is. The horizontal axis is time (s), and the vertical axis is the generated voltage (V). The generated voltage changes with time in accordance with the movement of the magnet 30, that is, the deformation of the spiral spring 10.

FIG. 12 is a diagram illustrating the generated voltage with respect to the deformation amount of the spiral spring 10 with respect to the result of the first embodiment. The horizontal axis is the amount of deformation (mm) of the spiral spring 10, and the vertical axis is the generated voltage V _p-p (V). It can be seen from the figure that the generated voltage V _p-p increases as the amount of deformation of the spiral spring 10 increases. It is considered that when the amount of deformation of the spiral spring 10 is increased, the rate at which the turns of the spring are in contact with each other in the axial direction increases, and a variable magnetic field is generated.

As a material of piano wire spring (SWP-B), steel wire spring (Fe60C), Fe ₄₉ Co ₄₉ V ₂ , Fe ₃₀ Co ₇₀ , spring diameter 10 mmφ, spring length 20 mm, spring wire thickness 1 mm spiral The spring 10 was produced. Then, as shown in FIG. 3, a winding coil 21 was provided on the outside of each spiral spring 10 by winding a 0.2 mm thick enamel wire with a diameter of 14 mmφ to a winding height of 140 mm. At that time, the spiral spring 10 and the winding coil 21 are coaxial, and the spiral spring 10 and the winding coil 21 have the same lower end in the height direction. The resistance of the winding coil 21 was about 80Ω. Using a 10 mmφ × 2 mmt neodymium magnet as the magnet 30, as shown in FIG. 3, the case where the magnet 30 is arranged up and down, the case where the magnet 30 is arranged only above and below, and the case where there is no magnet, Each reciprocated at a linear motion speed of 600 mm / s from above. The spiral spring 10 was deformed until the output from the winding coil was maximized. The amount of movement was about ± 10 mm.

  Table 1 is a table showing the results of Example 2. From Table 1, it can be seen that, regardless of which material is used for the spiral spring 10, the power generation efficiency is increased by arranging the magnets vertically. This is presumably because the spiral spring was magnetized by arranging the magnets, and the spiral spring received an oscillating pressure from the outside and efficiently generated a variable magnetic field.

In the second embodiment, the spiral spring 10 is shorter than the winding coil 21. Therefore, when the voltage V _pp generated from the winding coil 21 when the upper magnet 30 was reciprocated with respect to the winding coil 21 without installing the spiral spring 10 was measured, 0.097 ( V). This value is one or more orders of magnitude smaller than the result “only on the power generation amount (Vpp) magnet” in Table 1.

1: Power generation device 5: Electronic component 6: Unit 10: Spiral spring 10a: Body portion 10b, 10c: Extension portion 20: Conductor 21, 22: Winding coil 21a: Spiral portion 21b: Lead portions 30, 31, 32: Magnet (permanent magnet)
40: Load 51: Holder 52: Stage

Claims (10)

A spiral spring;
A conductor for converting a fluctuating magnetic field generated by pressure applied to the spiral spring from the outside into electricity;
A power generation device.   The power generator according to claim 1, wherein the conductor is a winding coil wound in a coil shape.   The power generator according to claim 2, wherein the winding coil is provided coaxially on at least one of an inner periphery and an outer periphery of the spiral spring.   The power generator according to claim 3, further comprising a magnet so that the spiral spring is magnetized.   The power generator according to claim 2, wherein the winding coil is provided by being insulated and wound around the spiral spring.   An electronic apparatus comprising: the power generation device according to claim 1; and an electronic component that operates upon receiving power from the power generation device.   A power generation method in which a fluctuating magnetic field is generated by applying pressure from the outside to a spiral spring, and a conductor converts the generated fluctuating magnetic field into electricity and outputs the electricity.   The power generation method according to claim 7, wherein a winding coil wound in a coil shape is used as the conductor. An external pressure is applied to the spiral spring through a magnet, and the magnet is displaced with respect to the winding coil,
The power generation method according to claim 8, wherein the winding coil converts both a variable magnetic field generated by displacement of the magnet and a variable magnetic field generated by deformation of the spiral spring into electricity.   The power generation method according to claim 7, wherein the external pressure applied to the spiral spring is a vibration pressure.

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