Vibration power generation module and vibration power generation device

Abstract

The vibration power generation module (60) is attached to the vibrating body (32) via a spring (21), and the spring constant and self-weight of the spring (21) are determined so as to resonate in a pendulum-like motion together with the spring (21) by the vibration of the vibrating body (32). It includes a magnet part (24) provided with a permanent magnet, and a power generation element (10) in which a voltage is generated by electromagnetic induction and the large Barkhausen effect in a coil wound around a magnetic core due to a change in the magnetic field based on the relative displacement of the position between the resonating magnet part (24).

Description

Technical Field

[0001] The present disclosure relates to a vibration power generation module and a vibration power generation device.

Background Art

[0002] When a magnetic material with tension applied or residual stress inside is magnetized, the magnetic wall inside the magnetic material moves at once, and the large Barkhausen effect in which the magnetization direction reverses in an extremely short time is known. When a pickup coil is wound around a magnetic material having the large Barkhausen effect, a pulse voltage can be generated in the pickup coil in response to the reversal of the magnetization direction of the magnetic material.

[0003] Based on such a large Barkhausen effect, energy harvesting technologies are known that use human activities (such as walking) or vibrations of machines as energy around the body for power generation.

[0004] Patent Document 1 discloses a power generation element that causes a magnetization reversal due to the large Barkhausen effect in a magnetic wire by a magnetic field changed by a reciprocating motion caused by the vibration of a magnet attached to a spring, and as a result of the magnetization reversal, charges a capacitor with a pulse voltage generated in a pickup coil wound around the magnetic wire.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, all of the technologies described in Patent Document 1 have a problem that only a part of the magnetic force lines generated from the magnet is induced in the magnetic body core, and the induction efficiency of the magnetic force lines generated from the magnet to the magnetic body core is not good.

[0007] The present disclosure aims to provide a vibration power generation module and a vibration power generation device capable of increasing the power generation amount by improving the induction efficiency of magnetic field lines generated from a magnet to a magnetic core.

Means for Solving the Problems

[0008] The vibration power generation module of the present disclosure is attached to a vibrating body via a spring, and includes a magnet portion provided with a permanent magnet and , total a power generation element in which a voltage is generated in a coil wound around a magnetic core due to a change in a magnetic field based on a relative displacement of the position of the vibrating magnet portion, and a holding mechanism that holds at an arbitrary position with respect to the total length of the spring; is provided with adjusting the spring constant of the spring by the holding mechanism; due to the vibration of the vibrating body, so that the spring and the magnet portion resonate together, the the spring constant of the spring and the self-weight are determined.

[0009] The vibration power generation device of the present disclosure the aforementioned vibration includes a rectifying portion that rectifies the voltage output by the power generation element of the power generation module, and a power storage portion that stores the voltage rectified by the rectifying portion.

Effects of the Invention

[0010] According to the present disclosure, it is possible to provide a vibration power generation module and a vibration power generation device capable of increasing the power generation amount by improving the induction efficiency of magnetic field lines generated from a magnet to a magnetic core.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0012] Hereinafter, the vibration power generation module and the vibration power generation device according to Embodiments 1 and 2 will be described with reference to the drawings. The following embodiments are merely examples, and it is possible to appropriately combine the embodiments and appropriately change each embodiment.

[0013] FIG. 1 is a perspective view showing the configuration of the power generation element 10 used in the vibration power generation module and the vibration power generation device according to Embodiments 1 and 2, and FIG. 1(b) is a side view thereof. The power generation element 10 according to the present embodiment has one or more composite magnetic wires which are magnetic cores 11 that generate the giant Barkhausen effect. The power generation element 10 desirably has a magnetic flux concentrator (soft magnetic material) 13 surrounding the outer periphery of the magnetic core 11. The magnetic flux concentrator 13 is disposed at both ends of the magnetic core 11 as a first magnetic flux concentrator 13A and a second magnetic flux concentrator 13B, respectively, and the coil 12 is wound around the magnetic core 11. As the soft magnetic material used for the magnetic flux concentrator 13, it is desirable to use steel materials such as SS400 or S45C, magnetic stainless steel materials such as SUS430 or SUS440, or high permeability materials such as permalloy or permendur, but any material with a permeability higher than that of air (a material with a relative permeability greater than 1) may be used. The magnetic core 11 has a magnetostrictive effect and expands and contracts due to magnetostriction in response to changes in the applied magnetic field.

[0014] FIG. 2(a) is a perspective view schematically showing the configuration of a power generation element 70 different from the power generation element 10 shown in FIG. 1, and FIG. 2(b) is a side view thereof. The power generation element 70 shown in FIG. 2 has a bobbin shape. In this case, the power generation element 70 is also called a magnetic bobbin. The coil 12 is wound around a cylindrical magnetic member 131 which is a constricted portion of the magnetic bobbin. Note that the power generation element 70 can be made of only a soft magnetic material such as iron as shown in FIG. 2, but the power generation efficiency is improved by providing the magnetic core 11 that generates the giant Barkhausen effect as shown in FIG. 1.

[0015] The flow of magnetic field lines 84 in the power generation element 10 shown in FIG. 1 will be described with reference to FIG. 3(a). FIG. 3 is a diagram for explaining the flow of magnetic field lines in the power generation element 10, and is a view of the power generation element 10 and the magnet section 24 as seen from the side. FIG. 3(a) is an explanatory diagram of the flow of magnetic field lines in the power generation element. FIG. 3(b) is an explanatory diagram of the flow of magnetic field lines when the magnetization direction of the magnet section is opposite to that shown in FIG. 3(a). In FIG. 3(a), following the magnetization direction 82, the magnetic field lines 84 emerging from the magnetized surface 80 (N pole) of the magnet section 24 enter the first magnetic flux collector 13A, pass through the magnetic core 11, and emerge from the second magnetic flux collector 13B into the air. That is, the magnetic field lines 84 passing through the first magnetic flux collector 13A and the second magnetic flux collector 13B both point in the +Y direction. Note that a part of the magnetic field lines 84 directly enters the magnetic core 11.

[0016] Next, the flow of magnetic field lines 94 in the power generation element 10 where the magnetization direction 92 of the magnet section 24 is opposite to that shown in FIG. 3(a) will be described with reference to FIG. 3(b). In FIG. 3(b), contrary to the case shown in FIG. 3(a), since the first magnetic flux collector 13A faces the magnetized surface 90 (S pole) of the magnet section 24, the magnetic field lines 94 pass from the second magnetic flux collector 13B through the magnetic core 11, via the first magnetic flux collector 13A, and towards the magnetized surface 90 (S pole). That is, the magnetic field lines 94 passing through the first magnetic flux collector 13A and the second magnetic flux collector 13B both point in the -Y direction. Note that a part of the magnetic field lines 84 directly enters the magnetic core 11. As shown in FIGS. 3(a) and 3(b), the magnetized surfaces 80, 90 of the magnet section 24 face the magnetic flux collectors 13 of the power generation element 10, and the magnetic flux collector surfaces 13A, 13B are orthogonal to the longitudinal direction of the power generation element 10 (the direction of the magnetic field lines 84, 94 contributing to power generation in the coil). Therefore, the magnetic field lines 84, 94 emerging from the magnetized surfaces 80, 90 of the magnet section 24 enter the magnetic flux collector 13 straight, and take a path that goes almost straight through the magnetic core 11 in the power generation element 10 and emerges from the opposite magnetic flux collector 13. As a result, the loss of the magnetic field lines 84, 94 emerging from the magnet section 24 is very small, and the most efficient electromagnetic induction power generation can be obtained.

[0017] 《Embodiment 1》 FIG. 4 is a perspective view showing an example of the configuration of the vibration power generation module 60 according to Embodiment 1. The vibration power generation module 60 shown in FIG. 4 includes a magnet part 24 attached to a vibrating body 32 such as a machine serving as a base via a spring 21, and a power generation element 10 attached to the vibrating body 32 via a pedestal 15. The magnet part 24 is composed of a first magnet 25, a second magnet 26, and a weight 27. The weight 27 is installed on the side opposite to the power generation element 10 with respect to the central axis of vibration of the spring 21. The power generation element 10 is composed of a magnetic core 11, a magnetic flux concentrator 13, and a coil 12. The spring 21 may be a spring in general such as a leaf spring in addition to a coil spring, and includes a mechanism in general that can amplify vibration by resonance in the same manner as a spring.

[0018] The spring constant of the spring 21 and the weight of the magnet part 24 are designed to resonate with the spring 21 with respect to the vibration frequency of the vibrating body 32, and the minute vibration of the vibrating body 32 is amplified by the spring 21. Since the amount of displacement generated in the magnet part 24 due to amplification becomes larger than the amount of displacement generated in the power generation element 10, a relative displacement occurs between the magnet part 24 and the power generation element 10, and a voltage is generated in the coil 12 of the power generation element 10 due to the relative displacement. Further, due to the weight 27, the center of gravity of the magnet part 24 is at a position on the weight 27 side with respect to the central axis of vibration of the spring 21, so the magnet part 24 can vibrate not in a simple vibration but in a pendulum-like motion. Due to such pendulum-like motion, the amount of displacement of the position of each of the first magnet 25 and the second magnet 26 constituting the magnet part 24 with respect to the power generation element 10 can be amplified as compared with the case of simple vibration.

[0019] As shown in FIG. 4, the magnet portion 24 is provided with a first magnet 25 and a second magnet 26 which are permanent magnets so as to face each of the magnetic flux concentrators 13 provided at both ends of the power generation element 10, respectively. Each of the first magnet 25 and the second magnet 26 has substantially equal magnetic forces and the polarities (magnetization directions) with respect to the power generation element 10 are opposite to each other, as indicated by magnetic moments 25M and 26M. The magnetization surfaces of the first magnet 25 and the second magnet 26 which do not face the magnetic flux concentrator 13 are attached via a magnetic yoke 29. That is, the first magnet 25 and the second magnet 26 are magnetized such that their magnetic poles are opposite to each other and the magnetic field lines generated from each of the first magnet 25 and the second magnet 26 penetrate the power generation element 10 along the magnetic core 11. Then, the magnetization surfaces of the first magnet 25 and the second magnet 26 are arranged corresponding to the direction of relative displacement, and the magnetization surfaces of the first magnet 25 and the second magnet 26 which do not face the power generation element 10 are fixed to the magnetic yoke 29. The magnetic yoke 29 is made of a soft magnetic material such as iron. In the first embodiment, since the magnetic yoke 29 to which the first magnet 25 and the second magnet 26 are fixed is magnetized by the magnetic forces of the first magnet 25 and the second magnet 26, respectively, the magnetic force acting on the power generation element 10 can be increased as a result. The magnetic yoke 29 may be integrated with the weight 27.

[0020] FIG. 6 is an explanatory diagram showing the positional relationship between the displacement direction 50 of the first magnet 25 and the second magnet 26 and the magnetic flux concentrator 13 of the power generation element 10. The displacement direction 50 shown in FIG. 6 is the amount of change in the relative position where the resonating magnet portion 24 changes with respect to the power generation element 10. As shown in FIGS. 4 and 6, the magnetized surfaces of the first magnet 25 and the second magnet 26 face the magnetic flux concentrator 13 with a gap 31 therebetween. The gap 31, which is the distance between the magnetized surfaces of the first magnet 25 and the second magnet 26 and the magnetic flux concentrator 13, is preferably narrower as the magnetic force acting on the magnetic core 11 increases and the power generation amount increases. FIG. 5 is a schematic diagram showing an example of the magnetic flux density waveform of the magnet portion 24 when the gap 31 is 0.5 mm, 1 mm, or 2 mm. As shown in FIG. 5, among the conditions where the gap 31 is 0.5 mm, 1 mm, and 2 mm respectively, the magnetic flux density is maximum when the gap 31 is 0.5 mm. However, since a magnetic attraction force acts between the first magnet 25 and the second magnet 26 and the magnetic flux concentrator 13, the substantially minimum gap 31 that can be assembled is about 1 mm. In Embodiment 1, since the magnet portion 24 performs a pitching motion, the gap 31 is set so that the pitching magnet portion 24 does not interfere with the magnetic flux concentrator 13 of the power generation element 10.

[0021] FIG. 5 shows that the magnetic flux density waveform in the magnet thickness direction, that is, in the direction of the magnetic moment 25M or the magnetic moment 26M, has two peaks on the positive side of the magnetic flux density. When the gap 31 is 1 mm, since the interval between the peaks is about 6 mm, the width of the most efficient magnetic flux concentrator 13 is 6 mm. When the gap 31 is 1 mm, in order to obtain more magnetic force, for example, by installing a magnetic flux concentrator 13 with a width of about 8 mm, it becomes possible to collect more magnetic flux lines 52 in the magnetic core 11. Theoretically, about 90% of the magnetic flux of the magnet portion 24 can be induced in the magnetic core 11.

[0022] In the power generation element 10, the width of the magnetic flux concentrator 13 in the direction of relative displacement (the vertical direction in FIG. 4) with respect to the magnet portion 24 is about 60% of the width of each magnetization surface of the first magnet 25 and the second magnet 26 of the magnet portion 24 facing the magnetic flux concentrator 13 in the direction of the relative displacement, with an upper limit of 80%. At least two magnets, the first magnet 25 and the second magnet 26, are required for the magnet portion 24. The smaller the installation interval between the first magnet 25 and the second magnet 26, the more power can be generated with a smaller displacement amount of the magnet. If the width of the magnetic flux concentrator 13 in the direction of relative displacement is wide, it is necessary to widen the gap 28 between the first magnet 25 and the second magnet 26. Therefore, exceeding the most efficient width (6 mm) described above is disadvantageous in terms of the magnet interval. From the viewpoint of the balance between the magnetic force and the magnet interval, the width of the magnetic flux concentrator is desirably 60% of the width of the magnet, with an upper limit of 80%.

[0023] The gap 28 provided between the first magnet 25 and the second magnet 26 is made of a non-magnetic material, and it is desirable that the width of the gap 28 in the direction of relative displacement is equal to or greater than the width of the magnetic flux concentrator 13 in the direction of relative displacement. The gap 28 may be an air gap or may be filled with a non-magnetic material such as copper, aluminum, or synthetic resin. If the width of the magnetic flux concentrator 13 in the direction of relative displacement is wide, when the magnetic flux concentrator 13 straddles the first magnet 25 and the second magnet 26 due to relative displacement, the magnetic flux concentrator 13 will collect both the upward magnetic field lines 52 of the first magnet 25 and the downward magnetic field lines 52 of the second magnet 26. As a result, the upward magnetic field lines 52 and the downward magnetic field lines 52 in the magnetic core 11 will cancel each other out, and the change in magnetic flux in the magnetic core 11 will become sluggish. If the gap 28 between the first magnet 25 and the second magnet 26 is provided to be about the same as or greater than the width of the magnetic flux concentrator 13 as shown in FIG. 6, the possibility that the magnetic flux concentrator 13 straddles the first magnet 25 and the second magnet 26 can be suppressed, and the change in internal magnetic flux of the magnetic core 11 can be increased.

[0024] Further, the magnet portion 24 is covered with a housing 30 made of a non-magnetic material such as copper, aluminum, or synthetic resin, which houses the first magnet 25 and the second magnet 26 connected to the magnetic yoke 29 and the weight 27. The other end of the spring 21, one end of which is fixed to the vibrating body 32, is fixed to the bottom of the housing 30.

[0025] As shown in FIGS. 4 and 6, when the spring 21 is not vibrating, each of the magnetic flux concentrators 13 existing at both ends of the power generation element 10 faces an end of either the first magnet 25 or the second magnet 26. Therefore, in a state where the spring 21 is not vibrating, the power generation element 10 and the first magnet 25 or the second magnet 26 are arranged in series, such as the first magnet 25 - power generation element 10 or the second magnet 26 - power generation element 10. As a result, the magnetic flux lines 52 generated from one end of the first magnet 25 or the second magnet 26 reach the other end of the first magnet 25 or the second magnet 26 through the magnetic core 11 of the power generation element 10. As a result, the magnetic flux lines 52 generated from the first magnet 25 or the second magnet 26 can be efficiently induced to the magnetic core 11. As a result of the magnetic flux lines 52 generated from the first magnet 25 or the second magnet 26 being efficiently induced to the magnetic core 11, in addition to the pulse voltage due to the large Barkhausen effect, a voltage due to electromagnetic induction is generated in the coil 12.

[0026] When the spring 21 vibrates due to the resonance described above, the magnet facing the magnetic flux concentrator 13 of the power generation element 10 is switched from, for example, the first magnet 25 to the second magnet 26, so the magnetic field applied to the magnetic core 11 of the power generation element 10 is reversed. Due to the reversal of the magnetic field, the large Barkhausen effect in which the magnetization direction inside the magnetic core 11 is reversed appears, and electromagnetic induction occurs in the coil 12, and a pulse voltage having a waveform as shown in FIG. 7(b) is generated in the coil 12 wound around the power generation element 10.

[0027] In Embodiment 1, the flux concentrator 13 of the power generation element 10 faces the magnetization surface of each of the first magnet 25 or the second magnet 26. As a result, most of the magnetic flux lines 52 generated from the first magnet 25 or the second magnet 26 propagate to the magnetic core 11 via the flux concentrator 13 facing the magnetization surface. As a result, the magnetic flux lines 52 can be efficiently induced to the magnetic core 11 via the flux concentrator 13. Then, the magnetic flux lines 52 generated from the first magnet 25 or the second magnet 26 propagate along the magnetic core 11 so as to penetrate the power generation element 10. When the magnet part 24 moves according to the displacement direction 50 due to resonance, the magnet facing the flux concentrator 13 of the power generation element 10 switches from, for example, the first magnet 25 to the second magnet 26, and the direction of the magnetic flux lines 52 acting on the flux concentrator 13 is reversed. As a result, a voltage due to the large Barkhausen effect and electromagnetic induction is generated in the coil 12.

[0028] Fig. 7(a) is a schematic diagram showing an example of a voltage waveform 140 generated by electromagnetic induction in a coil wound around an iron core having no large Barkhausen effect, and a voltage waveform 141 due to only the large Barkhausen effect. The voltage waveform 140 generated in the coil 12 wound around the iron core having no large Barkhausen effect in Fig. 7(a) shows that the pulse width is wide and the generated charge amount is large, but the peak voltage is as low as about 5V. Also, the peak voltage of the voltage waveform 141 due to only the large Barkhausen effect is as high as 15 to 20V, but the pulse width is as narrow as about 80 μS or less and the charge amount is small.

[0029] Fig. 7(b) is a schematic diagram showing an example of a voltage waveform 142 generated in the coil 12 by electromagnetic induction and the large Barkhausen effect according to Embodiment 1. In Embodiment 1, a high voltage of about 20 to 25V can be obtained by superimposing a voltage waveform due to the large Barkhausen effect with a prominent peak voltage on a voltage waveform with a large charge amount due to electromagnetic induction. In order to efficiently charge a capacitor, both a potential difference and charge are required, and the power generation device according to Embodiment 1 is suitable for charging a capacitor.

[0030] FIG. 8 is a block diagram showing an example of the configuration of the vibration power generation device 100 according to Embodiment 1. The vibration power generation module 60 includes a power generation element 10 and a magnet section 24, and generates a voltage in the coil 12 due to the displacement of the position of the magnet section 24 with respect to the power generation element 10. Since the voltage generated in the coil 12 exhibits a positive and negative pulse shape as shown in FIG. 7(b), it is full-wave rectified by the rectification section 62. The rectification section 62 may perform half-wave rectification instead of full-wave rectification.

[0031] The voltage full-wave rectified by the rectification section 62 is stored in the power storage section 64. The power storage section 64 is a rechargeable secondary battery, a capacitor, or the like. Since the waveform of the voltage output by the power generation element 10 exhibits a pulse shape with prominent peaks due to the large Barkhausen effect, if there is a risk of exceeding the voltage allowable for power storage in a secondary battery such as a lithium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, a capacitor is used for the power storage section 64.

[0032] The power stored in the power storage section 64 can be used, for example, as the power source for a sensor that detects the surrounding environment. When the vibration power generation device 100 is installed in a machine tool, the sensor can be used as the power source for a sensor that detects the temperature, humidity, acceleration, current amount, magnetic field, CO2 concentration, or various gas concentrations of the machine tool. Further, when the vibration power generation device 100 is installed in a general environment such as a house, it can be used as the power source for a sensor that detects the temperature, humidity, wind speed, wind direction, precipitation amount, magnetic field, CO2 concentration, pH of water or soil, water level, soil water content, slope of the land, acceleration (impact) due to an earthquake, etc., or solar radiation amount (on cloudy days) in the installed house.

[0033] As described above, according to the vibration power generation module 60 and the vibration power generation device 100 according to Embodiment 1, in addition to the magnetization reversal in the magnetic core 11 due to the large Barkhausen effect, the magnetic core 11 is actively utilized as an electromagnetic induction core, so that the magnetic field lines 52 generated from the magnet section 24 are induced to the magnetic core 11 through the magnetic flux concentrator 13. As a result, in addition to the large Barkhausen effect, by maximizing the electromagnetic induction component, the power generation amount can be increased.

[0034] In Embodiment 1, by determining the spring constant of the spring 21 and the self-weight of the magnet portion 24 so as to resonate with the vibration frequency of the vibrating body 32, the minute vibration of the vibrating body 32 can be amplified by the spring 21 and the displacement amount of the magnet can be increased. Further, by the weight 27 provided on the magnet portion 24, the center of gravity of the magnet portion 24 is displaced from the central axis of vibration, so that the swinging operation of the magnet portion 24 is added to the vertical vibration, and the displacement amount of the magnet can be amplified.

[0035] <<Embodiment 2>> Next, the vibration power generation module 72 according to Embodiment 2 will be described. FIG. 9 is a perspective view showing an example of the configuration of the vibration power generation module 72 according to Embodiment 2. In the vibration power generation module 72 shown in FIG. 9, a magnet portion 40 attached to a vibrating body 32 such as a machine serving as a base via a spring 21 does not have a weight 27, and a holding mechanism 34 for holding the magnet portion 40 at an arbitrary position with respect to the entire length of the spring 21 is provided on the vibrating body 32 side of the spring 21. Although it is different from Embodiment 1 in that, for the same configuration as that in Embodiment 1, the same reference numerals as those in Embodiment 1 are given and the detailed description is omitted.

[0036] The magnet portion 40 is substantially the same as the magnet portion 24 of Embodiment 1 except that it does not have a weight 27. Similar to Embodiment 1, the gap 42 provided between the first magnet 25 and the second magnet 26 is made of a non-magnetic material, and it is desirable that the width of the gap 42 in the direction of relative displacement is equal to or greater than the width of the flux concentrator 13 in the direction of relative displacement. The gap 42 may be an air gap, or may be filled with a non-magnetic material such as copper, aluminum, or synthetic resin. When the width of the flux concentrator 13 in the direction of relative displacement is wide, when the flux concentrator 13 straddles the first magnet 25 and the second magnet 26 due to relative displacement, the flux concentrator 13 collects both the upward magnetic field lines 52 of the first magnet 25 and the downward magnetic field lines 52 of the second magnet 26, and the upward magnetic field lines 52 and the downward magnetic field lines 52 in the magnetic core 11 cancel each other out, resulting in a dull change in the magnetic flux in the magnetic core 11. If the gap 42 between the first magnet 25 and the second magnet 26 is provided to be about the same as or larger than the width of the flux concentrator 13 as shown in FIG. 6, the possibility that the flux concentrator 13 straddles the first magnet 25 and the second magnet 26 can be suppressed, and the change in the internal magnetic flux of the magnetic core 11 can be increased.

[0037] Further, the magnet portion 24 is covered with a housing 43 made of a non-magnetic material such as copper, aluminum, or synthetic resin, with a first magnet 25 and a second magnet 26 connected to the magnetic yoke 41. The other end of a spring 21, one end of which is fixed to the vibrating body 32, is fixed to the bottom of the housing 43.

[0038] There are holding mechanisms 34 having different lengths in the direction of arrow 33. By using the holding mechanisms 34 with different lengths in the direction of arrow 33, the length of the portion where the spring 21 vibrates (hereinafter referred to as the "spring length") can be changed. Since the vibrating body 32, such as a machine, has individual differences in vibration frequency even for the same model, by adjusting the spring length with the holding mechanism 34, the spring constant can be adjusted to the resonance frequency of each vibrating body 32, enabling efficient power generation. Also, the power obtained from the vibration power generation module 72 according to the second embodiment can be supplied to the vibration power generation device 100 shown in FIG. 8.

[0039] In the second embodiment, the magnet portion 40 is shown in a form without the weight 27, but it is not limited thereto. The magnet portion 40 according to the second embodiment may have the weight 27 as in the first embodiment.

[0040] <<Modification Example of the Second Embodiment>> Next, a vibration power generation module 74 according to a modification example of the second embodiment will be described. FIG. 10 is a perspective view showing an example of the configuration of the vibration power generation module 74 according to the modification example of the second embodiment. The vibration power generation module 74 shown in FIG. 10 is different from the second embodiment in that a holding mechanism 35 provided on the side of the vibrating body 32 of the spring 21 has a cylindrical shape and a bolt 36 can be locked in any of a plurality of screw holes provided in the vertical direction on the side surface of the cylindrical shape. For the same components as in the second embodiment, the same reference numerals are used and detailed description is omitted.

[0041] In the second embodiment, the spring length was changed by replacing the holding mechanism 34 with different lengths in the direction of arrow 33. However, in a modified example of the second embodiment, by changing the position of the bolt 36 that locks to the holding mechanism 35, the spring constant of the spring 21 can be easily and quickly adjusted to the resonance frequency of each vibrating body 32. The electric power obtained in the vibration power generation module 74 according to the modified example of the second embodiment can be used for the vibration power generation device 100 shown in FIG. 8.

[0042] In the first embodiment, the second embodiment, and the modified example of the second embodiment, the magnetic flux concentrator 13 that efficiently guides the magnetic field lines 52 generated from the magnet portion 24 is provided in the power generation element 10, but the present invention is not limited to this. The configuration may be only the magnetic core 11 and the coil 12 without the magnetic flux concentrator 13. Further, the magnetization surface of the magnet portion 24 and the magnetic flux concentrator 13 may not face each other. Furthermore, the configuration may not have the magnetic core 11, and the bobbin-shaped member may be composed only of a soft magnetic material such as iron.

[0043] 《Embodiment 3》 Next, Embodiment 3 will be described. For Embodiment 3, two forms as shown in FIGS. 11 and 12 are conceivable depending on the magnetization directions 430 and 432 of the magnet 410. FIG. 11 shows the case where the magnetization direction 430 of the magnet 410 is in the longitudinal direction, and FIG. 12 shows the case where the magnetization direction 432 of the magnet 410 is in the thickness direction of the magnet 410.

[0044] The form of FIG. 11 shows a configuration example where the magnetization surface 410A of the magnet 410 and the magnetic flux collecting surface 110A of the power generation element 110 do not face each other. Utilizing the property that magnetic flux lines are incident perpendicularly to the surface of a magnetic material, the magnetic flux collecting surfaces 110A and 110B are planes perpendicular to the longitudinal direction of the magnetic core 111 (the direction in which magnetic flux lines flow). The magnetic flux lines incident on the magnetic flux collecting surface 110A are directly induced into the magnetic core 111 as they are. The magnetization direction of the magnet 410 is the longitudinal direction (the left - right direction in the figure), and the left side surface of the magnet 410 becomes the magnetization surface 410A of the N - pole. The magnetic flux lines 420 emerging from the magnetization surface 410A circulate around the magnet 410 and enter the S - pole of the magnetization surface 410B. At this time, the power generation element 110 is above the magnet 410, and the magnetic flux lines circulating around the magnet 410 are concentrated on the magnetic flux collecting surface 110A, and take a path passing through the magnetic core 111 and reaching the magnetization surface 410B of the magnet 410 from the magnetic flux collecting surface 110B. In this case, since only a part of the magnetic flux lines emerging from the magnetization surface 410A is collected by the magnetic flux collector 112 and induced to the power generation element 110, the efficiency of electromagnetic induction is worse compared to Embodiment 1. However, if it is possible to obtain operable power even with a poor electromagnetic induction component by making the power consumption of the power load connected to the power generation device according to Embodiment 3 extremely small, there is an advantage in that the degree of freedom in installing the power generation element with respect to the magnet 410 is high.

[0045] 《Modification Example of Embodiment 3》 The form of FIG. 12 shows a modification example of Embodiment 3 in which the magnetic flux collecting surface 110A of the power generation element 110 is made the side surface of the magnetic flux collector 112 so that the magnetization surface of the magnet 410 and the magnetic flux collecting surface 110A of the power generation element 110 face each other. The magnetization direction of the magnet 410 is the thickness direction (the up - down direction in the figure), and the upper left surface of the magnet 410 becomes the magnetization surface 410A of the N - pole, and the upper right surface of the magnet 410 becomes the magnetization surface 410B of the S - pole. The magnetic flux lines 422 emerging from the magnetization surface 410A are concentrated on the magnetic flux collecting surface 110A on the side surface of the magnetic flux collector 112, and take a path passing through the magnetic core 111 and reaching the magnetization surface 410B of the magnet 410 from the magnetic flux collecting surface 110B.

[0046] In this case, there are the following two problems. Problem (1): Since the longitudinal direction of the magnetic flux collecting surface 110A and the magnetic core 111 (the direction of the magnetic field lines contributing to power generation in the coil) are parallel, the magnetic field lines entering from the magnetic flux collecting surface 110A need to be induced into the magnetic core 111 so that they bend approximately 90 degrees. Therefore, some of the magnetic field lines take a path (dashed line in the figure) where they cannot bend within the magnetic flux collector 112 and some go straight and leak into the air, resulting in poor electromagnetic induction efficiency. Problem (2): When using a bundle of multiple composite magnetic wires for the magnetic core 111 as shown in FIG. 1, the magnetic field lines of the composite magnetic wires closer to the magnet 410 are likely to enter, while those of the composite magnetic wires farther from the magnet 410 are less likely to enter. As a result, variations in the internal magnetic flux occur among the multiple composite magnetic wires, leading to poor electromagnetic induction efficiency.

[0047] Note that as in Embodiment 1, when the magnetization surface 410A of the magnet 410 faces the magnetic flux collecting surface 110A of the power generation element 110, and the magnetic flux collecting surface 110A is perpendicular to the longitudinal direction of the power generation element 110 (the direction of the magnetic field lines contributing to power generation in the coil), the magnetic field lines emerging from the magnetization surface 410A of the magnet 410 enter the magnetic flux collecting surface 110A straight, proceed straight through the power generation element 110, and exit from the opposite magnetic flux collecting surface 110B. Therefore, the loss of the magnetic field lines emerging from the magnet 410 is extremely small, and this is a desirable form for obtaining the most efficient electromagnetic induction power generation.

[0048] <<Embodiment 4>> Next, Embodiment 4 will be described. FIG. 13 is a perspective view schematically showing the configuration of the power generation module according to Embodiment 4. In FIG. 13, for the magnetic core 111 around which the coil 120 is wound in the power generation element 110, a composite magnetic wire that generates the giant Barkhausen effect is used, but it is different from the power generation element 10 shown in FIG. 1 in that the magnetic flux collector 112 is not used.

[0049] In this configuration, since the magnetic flux concentrator 112 is not provided, the power generation efficiency is further inferior even when compared with FIGS. 11 or 12. However, if it is possible to obtain power that can operate even with an inefficient electromagnetic induction component by making the power consumption of the power load connected to the power generation device according to Embodiment 4 extremely small, the number of components can be reduced, and thus the power generation module can be configured at low cost.

Explanation of Signs

[0050] 10 Power generation element, 11 Magnetic core, 12 Coil, 13 Magnetic flux concentrator, 15 Pedestal, 21 Spring, 24 Magnet section, 25 First magnet, 25M Magnetic moment, 26 Second magnet, 26M Magnetic moment, 27 Weight, 28 Gap, 29 Magnetic yoke, 30 Housing, 31 Gap, 32 Vibrator, 34, 35 Holding mechanism, 42 Gap, 43 Housing, 50 Displacement direction, 60 Vibration power generation module, 62 Rectifying section, 64 Power storage section, 70 Power generation element, 72, 74 Vibration power generation module, 100 Vibration power generation device.

Claims

1. A magnet part having a permanent magnet, attached to a vibrating body via a spring; A power generation element that generates a voltage in a coil wound around a magnetic core due to a change in a magnetic field based on a relative displacement in position between the magnet part that resonates; A holding mechanism that holds the spring at an arbitrary position with respect to the total length of the spring; Comprising: Adjusting the spring constant of the spring by the holding mechanism; The spring constant of the spring and the self-weight of the magnet part are determined such that the spring and the magnet part both resonate due to the vibration of the vibrating body. A vibration power generation module characterized by the above.

2. A magnet part having a permanent magnet, attached to a vibrating body via a spring; A power generation element that generates a voltage in a coil wound around a magnetic core due to a change in a magnetic field based on a relative displacement in position between the magnet part that resonates; Comprising: The spring constant of the spring and the self-weight of the magnet part are determined such that the spring and the magnet part both resonate due to the vibration of the vibrating body. The magnet part has a weight, and the weight is installed on the side opposite to the power generation element with respect to the central axis of the vibration of the spring, so that the center of gravity of the magnet part is located on the side of the weight with respect to the central axis. A vibration power generation module characterized by the above.

3. The magnet part includes a first magnet, which is the permanent magnet, a second magnet, and a weight, and the self-weight is determined. The vibration power generation module according to claim 1 or 2, characterized in that.

4. The first magnet and the second magnet are magnetized such that their magnetic poles are opposite to each other, and the magnetic force lines generated from each of the first magnet and the second magnet penetrate the power generation element along the magnetic core. The magnetization surfaces of each of the first magnet and the second magnet are arranged corresponding to the direction of the relative displacement, and the magnetization surfaces of each of the first magnet and the second magnet that do not face the power generation element are fixed to a magnetic yoke. The vibration power generation module according to claim 3, characterized in that.

5. The power generation element includes magnetic flux concentrators made of a soft magnetic material at both ends in the longitudinal direction of the magnetic core. The vibration power generation module according to claim 4, characterized in that the magnetic core and the magnetic flux concentrators are integrally formed in a bobbin shape.

6. The width of the magnetic flux concentrator in the direction of the relative displacement is 60% to 80% of the width of the magnetization surface of the magnet part facing the magnetic flux concentrator in the direction of the relative displacement. The vibration power generation module according to claim 5, characterized in that.

7. A non-magnetic gap is provided between the first magnet and the second magnet, and the gap is equal to or greater than the width of the magnetic collector in the direction of the relative displacement. The vibration power generation module according to claim 6 ,

8. The magnetic core is made of one or more composite magnetic wires that produce a large Barkhausen effect.

3. The vibration power generation module according to claim 1 or 2,

9. a rectifier that rectifies a voltage output from the power generation element of the vibration power generation module according to claim 1 or 2; a storage unit that stores the voltage rectified by the rectification unit; A vibration power generation device comprising:

10. a rectifier that rectifies a voltage output by the power generation element of the vibration power generation module according to claim 8; a storage unit that stores the voltage rectified by the rectification unit; A vibration power generation device comprising:

11. The magnetic core is made of one or more composite magnetic wires that produce a large Barkhausen effect. The vibration power generation module according to claim 3 ,

12. A rectification unit that rectifies the voltage output by the power generation element of the vibration power generation module described in claim 3; a storage unit that stores the voltage rectified by the rectification unit; A vibration power generation device comprising:

13. A rectification unit that rectifies the voltage output by the power generation element of the vibration power generation module described in claim 11; a storage unit that stores the voltage rectified by the rectification unit; A vibration power generation device comprising:

Images