Vibration power generation module and vibration power generation device

Abstract

The vibration power generation module (60) includes: a magnet (24) mounted on a vibrating body (32) via a spring (21), the spring constant and weight of the spring (21) are determined by the vibration of the vibrating body (32) resonating with the spring (21) in a head-shaking motion, and it has a permanent magnet; and a power generation element (10) that generates a voltage based on electromagnetic induction and the Big Backhausen effect in a coil wound around a magnetic core by the change in magnetic field generated by the relative displacement between the magnet (24) and the resonating magnet.

Description

Technical Field

[0001] This disclosure relates to vibration power generation modules and vibration power generation devices. Background Technology

[0002] The Big Barkhausen effect is known: when a magnetic body is magnetized under tension or with residual internal stress, the domain walls inside the magnetic body move once, and the magnetization direction reverses in a very short time. When a pickup coil is wound around a magnetic body exhibiting the Big Barkhausen effect, a pulse voltage can be generated in the pickup coil based on the reversal of the magnetic body's magnetization direction.

[0003] The following energy harvesting technology is known: based on the Big Backhausen effect, it uses the energy generated by human activities (such as walking) or mechanical vibrations as energy to generate electricity.

[0004] Patent Document 1 discloses a power generation element that generates a magnetic wire through a magnetic field that changes due to the reciprocating motion caused by the vibration of a magnet mounted on a spring, causing a magnetization reversal based on the Big Backhausen effect. As a result of this magnetization reversal, a pulse voltage generated in a pickup coil wound around the magnetic wire is charged into a capacitor.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2018 / 097110 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, the technology described in Patent Document 1 has the following problem: it only guides a portion of the magnetic field lines generated by the magnet to the magnetic core, and the guiding efficiency of the magnetic field lines generated by the magnet to the magnetic core is not good.

[0010] The purpose of this disclosure is to provide a vibration power generation module and a vibration power generation device that can increase power generation by improving the guiding efficiency of magnetic field lines generated from a magnet to a magnetic core.

[0011] Methods for solving problems

[0012] The vibration power generation module disclosed herein is characterized by comprising: a magnet portion mounted on a vibrating body via a spring and having a permanent magnet; and a power generation element that generates a voltage in a coil wound around a magnetic core by means of a change in the magnetic field generated based on the relative displacement of the position between the resonant magnet portion and the magnetic core, wherein the spring constant of the spring and the weight of the magnet portion are determined such that the spring and the magnet portion resonate together through the vibration of the vibrating body.

[0013] The vibration power generation device disclosed herein is characterized by comprising: a rectifier section that rectifies the voltage output by the power generation element of the power generation module according to any one of claims 1 to 9; and an energy storage section that stores the voltage rectified by the rectifier section.

[0014] Invention Effects

[0015] According to this disclosure, a vibration power generation module and a vibration power generation device can be provided that can increase power generation by improving the guiding efficiency of magnetic field lines generated from a magnet to a magnetic core. Attached Figure Description

[0016] Figure 1 (a) is a perspective view showing the structure of the power generation element used in the vibration power generation module and vibration power generation device of embodiments 1 and 2. Figure 1 (b) is its side view.

[0017] Figure 2 (a) is a general representation of... Figure 1 The diagram shows a three-dimensional view of the structure of different power generation components. Figure 2 (b) is its side view.

[0018] Figure 3 (a) is an illustration of the flow of magnetic field lines in the power generation element. Figure 3 (b) is the magnetization direction of the magnet part and Figure 3 (a) An illustration of the flow of magnetic field lines in the opposite case.

[0019] Figure 4 This is a perspective view showing an example of the structure of the vibration power generation device according to Embodiment 1.

[0020] Figure 5 This is an explanatory diagram showing the magnetic flux density waveform along the thickness direction of the magnet.

[0021] Figure 6 This is an explanatory diagram showing the relationship between the displacement directions of the first and second magnets and the position of the magnet collector of the power generation element.

[0022] Figure 7 (a) is a schematic diagram showing an example of the waveform of the voltage generated by electromagnetic induction in a coil wound in an iron core without the Big Barkhausen effect and the waveform of the voltage generated only by the Big Barkhausen effect. Figure 7 (b) is a schematic diagram showing an example of the waveform of the voltage generated in the coil by electromagnetic induction and the Big Backhausen effect in this embodiment.

[0023] Figure 8 This is a block diagram illustrating an example of the structure of the vibration power generation device according to Embodiment 1.

[0024] Figure 9 This is a perspective view showing an example of the structure of the vibration power generation module in Embodiment 2.

[0025] Figure 10 This is a perspective view showing an example of the structure of a vibration power generation module, a modified example of Embodiment 2.

[0026] Figure 11 This is a schematic diagram of the power generation module in implementation method 3.

[0027] Figure 12 This is a schematic diagram of a modified example of the power generation module of Embodiment 3.

[0028] Figure 13 This is a schematic diagram of the power generation module in implementation method 4. Detailed Implementation

[0029] Hereinafter, the vibration power generation module and vibration power generation device of Embodiments 1 and 2 will be described with reference to the accompanying drawings. The following embodiments are merely examples, and the embodiments can be appropriately combined and modified.

[0030] Figure 1 This is a perspective view showing the structure of the power generation element 10 used in the vibration power generation module and vibration power generation device of embodiments 1 and 2. Figure 1 (b) is its side view. The power generation element 10 of this embodiment has one or more composite magnetic wires that serve as a magnetic core 11 that generates the large Backhausen effect. The power generation element 10 preferably has a magnetizing body (soft magnetic material) 13 surrounding the outer periphery of the magnetic core 11. The magnetizing body 13 is disposed at both ends of the magnetic core 11 as a first magnetizing body 13A and a second magnetizing body 13B, respectively, and the coil 12 is wound around the magnetic core 11. The soft magnetic material used for the magnetizing body 13 is preferably made of steel such as SS400 or S45C, magnetic stainless steel such as SUS430 or SUS440, or high permeability materials such as permalloy or perminide alloy, but any material with a permeability greater than air (a material with a relative permeability greater than 1) is acceptable. The magnetic core 11 has a magnetostrictive effect and expands and contracts by magnetostriction according to the change of the applied magnetic field.

[0031] Figure 2 (a) is a general representation of... Figure 1 The diagram shows a perspective view of the structures of different power generation elements 70 in the power generation element 10. Figure 2 (b) is its side view. Figure 2The power generation element 70 shown has a spool shape. In this case, the power generation element 70 is also referred to as a magnetic spool. The coil 12 is wound around the cylindrical magnetic member 131, which is the constricted portion of the magnetic spool. Furthermore, the power generation element 70 can also be... Figure 2 Such materials are made only of soft magnetic materials such as iron, but through methods such as Figure 1 The magnetic core 11, which possesses the ability to generate the large Backhausen effect, improves power generation efficiency.

[0032] use Figure 3 (a) of Figure 1 The flow of magnetic field lines 84 in the power generation element 10 shown will be explained. Figure 3 This is a diagram illustrating the flow of magnetic field lines in the power generation element 10, and it is a side view of the power generation element 10 and the magnet section 24. Figure 3 (a) is an illustration of the flow of magnetic field lines in the power generation element. Figure 3 (b) is the magnetization direction of the magnet part and Figure 3 (a) An illustration of the flow of magnetic field lines in the opposite case. Figure 3 In (a), magnetic field lines 84 emerging from the magnetization surface 80 (N pole) of the magnet section 24, in accordance with the magnetization direction 82, enter the first magnet collector 13A, pass through the magnetic core 11, and exit into the air from the second magnet collector 13B. That is, the magnetic field lines 84 passing through the first magnet collector 13A and the second magnet collector 13B are both oriented in the +Y direction. Furthermore, a portion of the magnetic field lines 84 directly enters the magnetic core 11.

[0033] Next, use Figure 3 (b) The magnetization direction 92 of the magnet part 24 is parallel to... Figure 3 The flow of magnetic field lines 94 in the power generation element 10 in the opposite direction to that shown in (a) will be explained. Figure 3 In (b), with Figure 3 In contrast to the case shown in (a), the first magnet 13A faces the magnetization surface 90 (S pole) of the magnet section 24, so the magnetic field lines 94 pass from the second magnet 13B through the magnetic core 11 and via the first magnet 13A to the magnetization surface 90 (S pole). That is, the magnetic field lines 94 passing through both the first magnet 13A and the second magnet 13B are oriented in the -Y direction. Furthermore, a portion of the magnetic field lines 84 directly enters the magnetic core 11. Figure 3 (a) and Figure 3As shown in (b), the magnetization surfaces 80 and 90 of the magnet section 24 are opposite to the magnet collector 13 of the power generation element 10, and the magnet collector surfaces 13A and 13B are orthogonal to the length direction of the power generation element 10 (the direction of the magnetic lines of force 84 and 94 that help generate electricity in the coil). As a result, the magnetic lines of force 84 and 94 coming out from the magnetization surfaces 80 and 90 of the magnet section 24 take a straight path into the magnet collector 13 and advance in a roughly straight path in the magnetic core 11 in the power generation element 10 and come out from the magnet collector 13 on the opposite side. Therefore, the loss of the magnetic lines of force 84 and 94 coming out from the magnet section 24 is very small, and the most efficient electromagnetic induction power generation can be obtained.

[0034] Implementation Method 1

[0035] Figure 4 This is a perspective view showing an example of the structure of the vibration power generation module 60 of Embodiment 1. Figure 4 The vibration power generation module 60 shown includes a magnet section 24 mounted on a vibrating body 32, such as a machine, via a spring 21, and a power generation element 10 mounted on the vibrating body 32 via a base 15. The magnet section 24 consists of a first magnet 25, a second magnet 26, and a counterweight 27. The counterweight 27 is positioned on the side opposite to the power generation element 10, relative to the central axis of vibration of the spring 21. The power generation element 10 consists of a magnetic core 11, a magnet collector 13, and a coil 12. The spring 21 can be any type of spring, such as a leaf spring, in addition to a helical spring. Furthermore, it includes various mechanisms that, like springs, can amplify vibrations through resonance.

[0036] The spring constant of spring 21 and the weight of magnet 24 are designed so that their vibration frequency relative to vibrating body 32 resonates with spring 21, amplifying the minute vibrations of vibrating body 32. The displacement generated in magnet 24 due to this amplification is greater than the displacement generated in power generation element 10, thereby creating a relative displacement between magnet 24 and power generation element 10. This relative displacement generates voltage in coil 12 of power generation element 10. Furthermore, due to the counterweight 27, the center of gravity of magnet 24 is located closer to the counterweight 27 than the central axis of vibration of spring 21. Therefore, magnet 24 does not undergo simple harmonic motion but can vibrate in a head-shaking motion. This head-shaking motion amplifies the displacement of the first magnet 25 and the second magnet 26 constituting magnet 24 relative to the power generation element 10, compared to simple harmonic motion.

[0037] like Figure 4As shown, a first magnet 25 and a second magnet 26, which are permanent magnets, are respectively disposed in the magnet section 24 opposite to the magnet collectors 13 disposed at both ends of the power generation element 10. The first magnet 25 and the second magnet 26, as indicated by their magnetic moments 25M and 26M respectively, have their magnetized surfaces, which are not opposite to the magnet collectors 13, mounted via a magnetic yoke 29, such that their magnetic forces are approximately equal and their polarities (magnetization directions) are opposite relative to each other with respect to the power generation element 10. That is, the first magnet 25 and the second magnet 26 are magnetized such that their magnetic poles are opposite and the magnetic lines of force generated by the first magnet 25 and the second magnet 26 respectively penetrate the power generation element 10 along the magnetic core 11. Furthermore, the magnetized surfaces of the first magnet 25 and the second magnet 26 are arranged corresponding to the direction of relative displacement, and the magnetized surfaces of the first magnet 25 and the second magnet 26 that are not opposite to 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 embodiment 1, the magnetic yoke 29, to which the first magnet 25 and the second magnet 26 are fixed, is magnetized by the respective magnetic forces of the first magnet 25 and the second magnet 26, thereby increasing the magnetic force acting on the power generation element 10. The magnetic yoke 29 may also be integrated with the counterweight 27.

[0038] Figure 6 This is an explanatory diagram showing the relationship between the displacement direction 50 of the first magnet 25 and the second magnet 26 and the position of the magnet collector 13 of the power generation element 10. Figure 6 The displacement direction 50 shown is the change in the relative position of the resonant magnet 24 with respect to the power generation element 10. For example... Figure 4 and Figure 6 As shown, the magnetized surfaces of the first magnet 25 and the second magnet 26 are positioned opposite the magnetizer 13 with a gap 31. When the gap 31 between the magnetized surfaces of the first magnet 25 and the second magnet 26 and the magnetizer 13 is narrower, the magnetic force acting on the magnetic core 11 increases, and the power generation increases. Figure 5 This is a schematic diagram showing an example of the magnetic flux density waveform of the magnet section 24 when the gap 31 is 0.5 mm, 1 mm, and 2 mm. (See diagram for example.) Figure 5 As shown, among the conditions of gap 31 being 0.5mm, 1mm, and 2mm, the magnetic flux density is the highest when the gap 31 is 0.5mm. However, since there is a magnetic attraction between the first magnet 25 and the second magnet 26 and the magnet collector 13, the smallest gap 31 that can actually be assembled is about 1mm. In Embodiment 1, the magnet part 24 performs a head-shaking motion, so the gap 31 is set in such a way that the head-shaking magnet part 24 does not interfere with the magnet collector 13 of the power generation element 10.

[0039] Figure 5The magnetic flux density waveform along the magnet thickness direction, i.e., the direction of magnetic moment 25M or 26M, is shown, exhibiting two peaks on the positive side of the magnetic flux density. With a gap 31 of 1 mm, the peak interval is approximately 6 mm, therefore the width of the most efficient magnet collector 13 is 6 mm. With a gap 31 of 1 mm, to obtain more magnetic force, for example, by providing a magnet collector 13 with a width of approximately 8 mm, more magnetic field lines 52 can be concentrated in the magnetic core 11. Theoretically, approximately 90% of the magnetic flux of the magnet portion 24 can be guided to the magnetic core 11.

[0040] The direction of the relative displacement of the magnet 13 in the power generation element 10 with respect to the position of the magnet part 24 (in) Figure 4 The width of the magnet in the vertical direction (as shown in the image) is approximately 60% of the width of the magnetized surfaces of the first magnet 25 and the second magnet 26 of the magnet section 24 opposite the magnetizer 13 in the direction of relative displacement, with an upper limit of 80%. The magnet section 24 requires at least two magnets, the first magnet 25 and the second magnet 26. When the spacing between the first magnet 25 and the second magnet 26 is narrow, power generation can be achieved with a smaller amount of magnet displacement. If the width of the magnetizer 13 in the direction of relative displacement is wider, the gap 28 between the first magnet 25 and the second magnet 26 needs to be increased. Therefore, if the width exceeds the optimal width (6 mm) mentioned above, it is disadvantageous in terms of magnet spacing. Therefore, from the viewpoint of balancing magnetic force and magnet spacing, the width of the magnetizer is preferably 60% of the width of the magnet, with an upper limit of 80%.

[0041] Preferably, the gap 28 between the first magnet 25 and the second magnet 26 is made of a non-magnetic material, and the width of the gap 28 in the direction of relative displacement is greater than the width of the magnet collector 13 in the direction of relative displacement. The gap 28 can be an air gap or filled with a non-magnetic material such as copper, aluminum, or synthetic resin. If the width of the magnet collector 13 in the direction of relative displacement is wider, then when the magnet collector 13 crosses the first magnet 25 and the second magnet 26 during relative displacement, the magnet collector 13 concentrates both the upward magnetic field lines 52 of the first magnet 25 and the downward magnetic field lines 52 of the second magnet 26. Within the magnetic core 11, the upward and downward magnetic field lines 52 cancel each other out, and the change in magnetic flux within the magnetic core 11 becomes sluggish. Figure 6 As shown, if the gap 28 between the first magnet 25 and the second magnet 26 is set to be the same as or greater than the width of the magnet collector 13, the possibility of the magnet collector 13 crossing the first magnet 25 and the second magnet 26 can be suppressed, and the internal magnetic flux change of the magnetic core 11 can be increased.

[0042] Furthermore, the first magnet 25 and the second magnet 26, which are connected to the magnetic yoke 29, and the counterweight 27 of the magnet part 24 are covered by a housing 30 made of a non-magnetic material such as copper, aluminum, or synthetic resin. The other end of the spring 21, which is fixed to the vibrator 32 at one end, is fixed to the bottom of the housing 30.

[0043] like Figure 4 and Figure 6 As shown, when the spring 21 is not vibrating, the magnets 13 at both ends of the power generation element 10 are respectively opposed to the ends of either the first magnet 25 or the second magnet 26. Therefore, when the spring 21 is not vibrating, the power generation element 10 is connected in series with either the first magnet 25 or the second magnet 26, such as the first magnet 25-power generation element 10 or the second magnet 26-power generation element 10. Thus, magnetic field 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 via the magnetic core 11 of the power generation element 10. As a result, the magnetic field lines 52 generated from the first magnet 25 or the second magnet 26 can be efficiently guided to the magnetic core 11. Because the magnetic field lines 52 generated from the first magnet 25 or the second magnet 26 are efficiently guided to the magnetic core 11, a voltage based on electromagnetic induction is generated in the coil 12, in addition to the pulse voltage based on the Big Barkhausen effect.

[0044] When the spring 21 vibrates due to the aforementioned resonance, the magnet opposite the magnetizer 13 of the power generation element 10 switches from the first magnet 25 to the second magnet 26, thus reversing the magnetic field applied to the magnetic core 11 of the power generation element 10. This reversal of the magnetic field manifests a large Backhausen effect, where the magnetization direction inside the magnetic core 11 is reversed, and electromagnetic induction is generated in the coil 12, producing an effect similar to... Figure 7 The pulse voltage of the waveform shown in (b).

[0045] In Embodiment 1, the magnetizer 13 of the power generation element 10 faces the magnetization face of either the first magnet 25 or the second magnet 26, thereby allowing most of the magnetic field lines 52 generated from the first magnet 25 or the second magnet 26 to propagate to the magnetic core 11 via the magnetizer 13 facing the magnetization face. As a result, the magnetic field lines 52 can be efficiently guided to the magnetic core 11 via the magnetizer 13. Furthermore, the magnetic field lines 52 generated from the first magnet 25 or the second magnet 26 propagate along the magnetic core 11 through the power generation element 10. When the magnet portion 24 moves along the displacement direction 50 due to resonance, the magnet facing the magnetizer 13 of the power generation element 10, for example, switches from the first magnet 25 to the second magnet 26, and the direction of the magnetic field lines 52 acting on the magnetizer 13 is reversed. As a result, a voltage generated in the coil 12 due to the Big Barkhausen effect and electromagnetic induction is produced.

[0046] Figure 7 (a) is a schematic diagram showing an example of a voltage waveform 140 generated by electromagnetic induction in a coil wound in an iron core without the Big Backhausen effect and a voltage waveform 141 generated only by the Big Backhausen effect. Figure 7 In (a), the waveform 140 of the voltage generated in a coil 12 wound on an iron core that does not exhibit the large Backhausen effect shows a wide pulse width and a large amount of charge generated, but the peak voltage is as low as about 5V. In contrast, the waveform 141 of the voltage generated solely by the large Backhausen effect has a peak voltage as high as 15-20V, but the pulse width is as narrow as less than 80μS and the amount of charge is small.

[0047] Figure 7 (b) is a schematic diagram showing an example of the waveform 142 of the voltage generated in coil 12 by electromagnetic induction and the Big Barkhausen effect in Embodiment 1. In Embodiment 1, by superimposing a voltage waveform with a significant peak voltage generated by the Big Barkhausen effect onto a voltage waveform with a large amount of charge generated by electromagnetic induction, a high voltage of approximately 20 to 25 V can be obtained. For efficient charging of the capacitor, both a potential difference and a charge are required; the power generation device of Embodiment 1 is suitable for charging the capacitor.

[0048] Figure 8 This is a block diagram illustrating an example of the structure 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 24. Voltage is generated in the coil 12 by the displacement of the magnet 24 relative to the position of the power generation element 10. The voltage generated in the coil 12 is as follows: Figure 7 As shown in (b), the pulses are positive and negative, and are therefore fully rectified by the rectifier 62. The rectifier 62 may also perform half-wave rectification instead of full-wave rectification.

[0049] The voltage after full-wave rectification by the rectifier 62 is stored in the energy storage section 64. The energy storage section 64 is a rechargeable secondary battery or capacitor, etc. The waveform of the voltage output by the power generation element 10 is pulsed with significant peaks due to the large Backhausen effect. Therefore, in cases where the voltage may exceed the allowable voltage for energy storage of secondary batteries such as lithium-ion batteries, nickel-metal hydride batteries, or nickel-cadmium batteries, a capacitor is used in the energy storage section 64.

[0050] The electricity stored in the energy storage unit 64 can be used as a power source for sensors that detect the surrounding environment. Regarding sensors, when the vibration power generation device 100 is installed on a machine tool, it can be used as a power source for sensors that detect the machine tool's temperature, humidity, acceleration, current, magnetic field, CO2 concentration, or various gas concentrations. Furthermore, when the vibration power generation device 100 is installed in a general environment such as a building, it can be used as a power source for sensors that detect the building's temperature, humidity, wind speed, wind direction, rainfall, magnetic field, CO2 concentration, pH of water or soil, water level, soil moisture content, land tilt, acceleration (impact) caused by earthquakes, or solar radiation (on cloudy days).

[0051] As explained above, according to Embodiment 1, the vibration power generation module 60 and vibration power generation device 100, in addition to the magnetization reversal in the magnetic core 11 based on the Big Backhausen effect, guide the magnetic lines of force 52 generated from the magnet section 24 to the magnetic core 11 via the magnet collector 13 in order to actively utilize the magnetic core 11 as an electromagnetic induction core. As a result, in addition to the Big Backhausen effect, by maximizing the electromagnetic induction component, the power generation can be increased.

[0052] In Embodiment 1, by determining the spring constant of the spring 21 and the weight of the magnet 24 in a manner that resonates with the vibration frequency of the vibrating body 32, the spring 21 can amplify the minute vibrations of the vibrating body 32 and increase the displacement of the magnet. Furthermore, by providing a counterweight 27 to the magnet 24, the center of gravity of the magnet 24 is shifted from the central axis of vibration, thereby applying a head-shaking motion to the up-and-down vibration of the magnet 24 and amplifying the displacement of the magnet.

[0053] Implementation Method 2

[0054] Next, the vibration power generation module 72 of Embodiment 2 will be described. Figure 9 This is a perspective view showing an example of the structure of the vibration power generation module 72 in Embodiment 2. Figure 9 The difference between the vibration power generation module 72 shown and Embodiment 1 is that the magnet part 40, which is mounted on the vibrating body 32, which serves as the base, via the spring 21, does not have a counterweight 27, and a holding mechanism 34 is provided on the vibrating body 32 side of the spring 21 to hold it at any position relative to the full length of the spring 21. For structures that are the same as those in Embodiment 1, the same reference numerals are used as in Embodiment 1 and detailed descriptions are omitted.

[0055] The magnet part 40 is substantially the same as the magnet part 24 in Embodiment 1, except that it does not have the counterweight 27. Similarly to Embodiment 1, it is preferable that the gap 42 provided between the first magnet 25 and the second magnet 26 is made of a non-magnetic material, and the width of the gap 42 in the direction of relative displacement is greater than the width of the magnet collector 13 in the direction of relative displacement. The gap 42 can be an air gap or filled with a non-magnetic material such as copper, aluminum, or synthetic resin. If the width of the magnet collector 13 in the direction of relative displacement is wider, then when the magnet collector 13 crosses the first magnet 25 and the second magnet 26 during relative displacement, the magnet collector 13 concentrates both the upward magnetic field lines 52 of the first magnet 25 and the downward magnetic field lines 52 of the second magnet 26. Within the magnetic core 11, the upward and downward magnetic field lines 52 cancel each other out, and the change in magnetic flux within the magnetic core 11 becomes sluggish. Figure 6 As shown, if the gap 42 between the first magnet 25 and the second magnet 26 is set to be the same as or greater than the width of the magnet collector 13, the possibility of the magnet collector 13 crossing the first magnet 25 and the second magnet 26 can be suppressed, and the internal magnetic flux change of the magnetic core 11 can be increased.

[0056] Furthermore, the first magnet 25 and the second magnet 26 of the magnet section 24, which are connected to the magnetic yoke 41, are covered by a housing 43 made of a non-magnetic material such as copper, aluminum, or synthetic resin. The other end of the spring 21, which is fixed to the vibrator 32 at one end, is fixed to the bottom of the housing 43.

[0057] The retaining mechanism 34 has retaining mechanisms of different lengths in the direction of arrow 33. By using retaining mechanisms 34 with different lengths in the direction of arrow 33, the length of the vibrating part of the spring 21 (hereinafter referred to as "spring length") can be changed. As a vibrating body 32 of a machine or the like, even if it is the same model, each device has individual differences in vibration frequency. Therefore, by adjusting the spring length using the retaining mechanism 34, the spring constant can be adjusted to the resonant frequency of each vibrating body 32, thereby generating electricity efficiently. In addition, the electricity obtained from the vibration power generation module 72 of Embodiment 2 can be provided to Figure 8 The vibration power generation device 100 shown is shown.

[0058] In Embodiment 2, the magnet part 40 is shown without the counterweight 27, but it is not limited to this. The magnet part 40 in Embodiment 2 may also have the counterweight 27 in the same way as in Embodiment 1.

[0059] Variations of Implementation Method 2

[0060] Next, the vibration power generation module 74 of the modified embodiment 2 will be described. Figure 10 This is a perspective view showing an example of the structure of the vibration power generation module 74, a modified example of Embodiment 2. Figure 10The difference between the vibration power generation module 74 shown and Embodiment 2 is that the retaining mechanism 35 provided on the vibrating body 32 side of the spring 21 is cylindrical and can lock the bolt 36 in any of the multiple threaded holes provided in the vertical direction along the side of the cylindrical shape. For structures that are the same as those in Embodiment 2, the same reference numerals are used as in Embodiment 2 and detailed descriptions are omitted.

[0061] In Embodiment 2, the spring length is changed by replacing the retaining mechanism 34 with a different length in the direction of arrow 33. However, in a variation of Embodiment 2, the spring constant of spring 21 can be easily and quickly adjusted to the resonant frequency of each vibrating body 32 by changing the position of the bolt 36 that locks onto the retaining mechanism 35. The power obtained from the vibration power generation module 74 in the variation of Embodiment 2 can be used to provide... Figure 8 The vibration power generation device 100 shown is shown.

[0062] In Embodiments 1, 2, and variations thereof, a magnetizing element 13 that efficiently guides the magnetic lines of force 52 generated from the magnet section 24 is provided on the power generation element 10, but this is not a limitation. A structure may also exist without the magnetizing element 13, having only a magnetic core 11 and a coil 12. Alternatively, a structure may exist where the magnetization surface of the magnet section 24 is not opposite to the magnetizing element 13. Furthermore, a component in the shape of a spool may also be used without the magnetic core 11, consisting only of a soft magnetic material such as iron.

[0063] Implementation Method 3

[0064] Next, Embodiment 3 will be described. Embodiment 3 considers the magnetization directions 430 and 432 of the magnet 410. Figure 11 as well as Figure 12 These are the two methods. Figure 11 This indicates the case where the magnetization direction 430 of magnet 410 is along its length. Figure 12 This indicates the case where the magnetization direction 432 of magnet 410 is the thickness direction of magnet 410.

[0065] Figure 11This diagram illustrates a structural example where the magnetization surface 410A of magnet 410 and the collecting surface 110A of power generation element 110 are not opposite each other. Utilizing the property that magnetic field lines are incident perpendicularly on the surface of a magnetic body, the collecting surfaces 110A and 110B are perpendicular to the length direction (direction of magnetic field line flow) of the magnetic core 111. Magnetic field lines incident on the collecting surface 110A are directly and straightly guided to the magnetic core 111. The magnetization direction of magnet 410 is the length direction (left-right direction in the diagram), and the left side of magnet 410 becomes the magnetization surface 410A with the N pole. Magnetic field lines 420 emerging from the magnetization surface 410A circle around magnet 410 and enter the S pole of magnetization surface 410B. At this time, the power generation element 110 is located above the magnet 410, and the magnetic field lines around the magnet 410 converge at the magnetizing surface 110A, obtaining a path through the magnetic core 111 from the magnetizing surface 110B to the magnetized surface 410B of the magnet 410. In this case, since the magnetizing body 112 only collects a portion of the magnetic field lines from the magnetized surface 410A and guides them to the power generation element 110, the efficiency of electromagnetic induction is worse compared to Embodiment 1. However, if the power consumption of the electrical load connected to the power generation device of Embodiment 3 is very small, even the inefficient electromagnetic induction component can obtain operable power, which has the advantage of a high degree of freedom in the arrangement of the power generation element relative to the magnet 410.

[0066] Variations of Implementation Method 3

[0067] Figure 12 This is a variation of Embodiment 3, where the magnetizing surface of the magnet 410 is positioned opposite the magnetizing surface 110A of the power generation element 110 to the side of the magnetizer 112. The magnetization direction of the magnet 410 is the thickness direction (vertical direction in the figure). The upper left surface of the magnet 410 becomes the magnetizing surface 410A (N pole), and the upper right surface becomes the magnetizing surface 410B (S pole). Magnetic lines 422 emanating from the magnetizing surface 410A converge at the magnetizing surface 110A located on the side of the magnetizer 112, thus establishing a path through the magnetic core 111 from the magnetizing surface 110B to the magnetizing surface 410B of the magnet 410.

[0068] In this situation, the following two issues arise.

[0069] Problem (1): Since the magnetic collecting surface 110A is parallel to the length direction of the magnetic core 111 (the direction of the magnetic lines of force that help generate electricity in the coil), the magnetic lines of force entering from the magnetic collecting surface 110A need to be guided into the magnetic core 111 in a manner that bends at approximately 90 degrees. Therefore, some of the magnetic lines of force are not completely bent within the magnetic collecting body 112, but instead take a part of a straight path that leaks out into the air (dashed line in the figure), thereby reducing the efficiency of electromagnetic induction.

[0070] Topic (2): In such Figure 1 When a magnetic core 111 made of multiple composite magnetic wires is used, magnetic lines of force easily enter the composite magnetic wires located on the side close to the magnet 410, while magnetic lines of force have difficulty entering the composite magnetic wires located on the side far from the magnet 410. As a result, a deviation in internal magnetic flux occurs between the multiple composite magnetic wires, and the efficiency of electromagnetic induction deteriorates.

[0071] Furthermore, as in Embodiment 1, if the magnetization surface 410A of the magnet 410 is opposite to the magnetic collecting surface 110A of the power generation element 110, and the magnetic collecting surface 110A is orthogonal to the length direction of the power generation element 110 (the direction of the magnetic lines of force that facilitate power generation in the coil), then the magnetic lines of force coming out from the magnetization surface 410A of the magnet 410 will enter the magnetic collecting surface 110A in a straight line, travel directly and straight within the power generation element 110, and exit from the magnetic collecting surface 110B on the opposite side. Therefore, the loss of the magnetic lines of force coming out from the magnet 410 is very small, which is the preferred method for obtaining the most efficient electromagnetic induction power generation.

[0072] Implementation Method 4

[0073] Next, implementation method 4 will be described. Figure 13 This is a perspective view that schematically illustrates the structure of the power generation module in Embodiment 4. Figure 13 In the power generation element 110, the magnetic core 111, which serves as the winding coil 120, uses composite magnetic wire that generates the large Backhausen effect, but unlike the previous method, a magnet collector 112 is not used. Figure 1 The power generation element 10 shown is different.

[0074] In this structure, since it lacks a magnet collector 112, the power generation efficiency is similar to... Figure 11 or Figure 12 While it is worse than the previous method, if the power consumption of the electrical load connected to the power generation device of embodiment 4 is very small, even the inefficient electromagnetic induction component can obtain operable power. Therefore, since the number of components is reduced, the power generation module can be constructed cheaply.

[0075] Label Explanation

[0076] 10: Power generation element; 11: Magnetic core; 12: Coil; 13: Magnet collector; 15: Base; 21: Spring; 24: Magnet part; 25: First magnet; 25M: Magnetic moment; 26: Second magnet; 26M: Magnetic moment; 27: Counterweight; 28: Gap; 29: Magnetic yoke; 30: Housing; 31: Gap; 32: Vibrating body; 34, 35: Holding mechanism; 42: Gap; 43: Housing; 50: Displacement direction; 60: Vibration power generation module; 62: Rectifier part; 64: Energy storage part; 70: Power generation element; 72, 74: Vibration power generation module; 100: Vibration power generation device.

Claims

1. A vibration power generation module, characterized in that, have: The magnet part, which is mounted on the vibrating body via a spring, and has a permanent magnet; and The power generation element generates voltage in a coil wound around a magnetic core by means of a change in the magnetic field caused by the relative displacement of the position between the magnet and the resonant magnet. The spring constant of the spring and the weight of the magnet are determined such that the spring and the magnet resonate together through the vibration of the vibrating body.

2. The vibration power generation module according to claim 1, characterized in that, The magnet part consists of a first magnet and a second magnet, which are permanent magnets, and a counterweight, the weight of which is determined.

3. The vibration power generation module according to claim 2, characterized in that, The first magnet and the second magnet are magnetized with their magnetic poles opposite to each other, and the magnetic lines of force generated from the first magnet and the second magnet respectively pass through the magnetic core of the power generation element. The magnetized surfaces of the first magnet and the second magnet are arranged corresponding to the direction of the relative displacement, and the magnetized surfaces of the first magnet and the second magnet that are not opposite to the power generation element are fixed to the magnetic yoke.

4. The vibration power generation module according to claim 3, wherein, The power generation element has magnets made of soft magnetic material at both ends of the magnetic core along its length. The magnetic core and the magnet are integrally formed in the shape of a spool.

5. The vibration power generation module according to claim 4, characterized in that, The width of the magnet in the direction of relative displacement is 60% to 80% of the width of the magnetized surface of the magnet part opposite to the magnet in the direction of relative displacement.

6. The vibration power generation module according to claim 5, characterized in that, There is a non-magnetic gap between the first magnet and the second magnet, the gap being greater than or equal to the width of the magnet in the direction of the relative displacement.

7. The vibration power generation module according to claim 6, characterized in that, The counterweight is positioned on the opposite side of the power generation element relative to the central axis of the spring's vibration, thereby placing the center of gravity of the magnet closer to the counterweight side than the central axis.

8. The vibration power generation module according to claim 7, characterized in that, A holding mechanism is provided that can hold the spring at any position relative to its full length.

9. The vibration power generation module according to any one of claims 1 to 8, characterized in that, The magnetic core is composed of one or more composite magnetic wires that generate the large Backhausen effect.

10. A vibration power generation device, comprising: A rectifier section, which rectifies the voltage output by the power generation element of the power generation module according to any one of claims 1 to 8; and The energy storage unit stores the voltage rectified by the rectifier unit.

11. A vibration power generation device, comprising: A rectifier section that rectifies the voltage output by the power generation element of the power generation module according to claim 9; and The energy storage unit stores the voltage rectified by the rectifier unit.

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