Vibration energy harvester using double resonance

Abstract

A vibration energy harvester using double resonance according to an embodiment of the present invention comprises: a main body; a central shaft having both ends respectively fixed to upper and lower portions of the main body; a bobbin fixed to the central shaft and wound with a coil; a first mass body disposed to surround the outer circumferential surface of the bobbin and moving along the central shaft; a second mass body disposed between the first mass body and the main body, formed to surround the outer circumferential surface of the first mass body, and moving along the central shaft; a magnet disposed on the first mass body to be adjacent to the bobbin; a first elastic body disposed between the first mass body and the second mass body; and a second elastic body disposed between the second mass body and the main body.

Description

Vibration energy harvester using dual resonance

[0001] The present invention relates to a vibration energy harvester that generates electric power using double resonance.

[0002] Energy harvesting is a representative technology of self-generation modules. Energy harvesting technology is a technology that converts waste energy from the surroundings into usable electrical energy by harvesting or scavenging it. Energy harvesting technology can absorb natural light energy, low-temperature waste heat energy from the human body or combustion engines, micro-vibration energy from portable devices mounted / attached devices, and dissipated energy from human body activities, and can utilize energy harvesting components such as thermoelectric elements, electrochemical reactions, DC / AC generators, piezoelectric transducers, capacitor transducers, and photovoltaic cells. Typically, the power level that can be obtained through energy harvesting technology is approximately microwatts (㎼) to milliwatts (㎽).

[0003] This energy harvesting technology can be applied to a wide range of fields. For example, vibrations generated by high-speed trains or vehicles can be utilized. Wireless sensors can be integrated into railway vehicles to monitor the status of various systems, including the train operation system, high-voltage system, traction system, braking system, auxiliary power unit, and body electrical system. The sensed information can then be transmitted via wireless communication channels.

[0004] However, in the case of energy harvesting technology that utilizes conventional vibrations, there was a problem in that it could not transmit sufficient vibrations for energy conversion.

[0005] Meanwhile, Korean Patent Publication No. 10-2012-0024018 (Title of invention: Energy harvester) discloses an energy harvester that converts vibration energy transmitted from the outside into electrical energy.

[0006] The present invention aims to solve the problems of the prior art described above and to provide a vibration energy harvester using dual resonance that can maximize energy conversion efficiency.

[0007] As a technical means for achieving the above-described technical task, a vibration energy harvester using dual resonance according to one embodiment of the present invention includes a main body, a central axis having both ends fixed to the upper and lower portions of the main body, a bobbin fixed to the central axis and having a coil wound thereon, a first mass body arranged to surround an outer circumference of the bobbin and moving along the central axis, a second mass body arranged between the first mass body and the main body, formed to surround an outer circumference of the first mass body and moving along the central axis, a magnet arranged adjacent to the bobbin on the first mass body, a first elastic body arranged between the first mass body and the second mass body, and a second elastic body arranged between the second mass body and the main body.

[0008] According to the technical means of the present invention described above, it is possible to easily change the resonance frequency by including a first elastic body and a second elastic body and changing the number of turns and thickness of each elastic body, thereby having the effect of utilizing dual resonance.

[0009] In addition, according to the technical means of the present invention described above, when the resonance frequencies of two elastic bodies are made the same, the amount of motion can be amplified, thereby securing a high amount of power generation, and when the resonance frequencies of the two elastic bodies are made different, the amount of motion can be secured for the two frequencies, thereby having the effect of increasing the amount of power generation.

[0010] Figure 1 is a perspective view of an energy harvester according to one embodiment of the present invention.

[0011] Figure 2 is a cross-sectional perspective view of an energy harvester according to one embodiment of the present invention.

[0012] Figure 3 is a cross-sectional view of an energy harvester according to one embodiment of the present invention.

[0013] Figure 4 is a cross-sectional view of a second mass body according to one embodiment of the present invention.

[0014] Figure 5 is a cross-sectional view of a first mass body according to one embodiment of the present invention.

[0015] Fig. 6 is a cross-sectional view of a bobbin according to one embodiment of the present invention.

[0016] Below, with reference to the attached drawings, embodiments of the present invention are described in detail to facilitate easy implementation by those skilled in the art. However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity, and similar reference numerals have been used throughout the specification to indicate similar elements.

[0017] Throughout this specification, when a part is said to be "connected" to another part, this includes not only cases where it is "directly connected" but also cases where it is "electrically connected" with another element in between.

[0018] Throughout this specification, when it is said that an element is “on” another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0019] Throughout this specification, when a part is said to "include" a certain component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated. The terms "about," "substantially," and the like, as used throughout this specification, are used to mean at or near the numerical value when manufacturing and material tolerances inherent to the meanings stated, and are used to prevent unscrupulous infringers from unfairly exploiting disclosures that state precise or absolute values ​​to aid understanding of this specification. The terms "step of doing" or "step of" as used throughout this specification do not mean "step for."

[0020] The present invention relates to a vibration energy harvester using dual resonance, and to an energy harvester that converts vibration energy into electrical energy.

[0021] FIG. 1 is a perspective view of a vibration energy harvester (10) using dual resonance according to one embodiment of the present invention, FIG. 2 is a cross-sectional perspective view of a vibration energy harvester (10) using dual resonance according to one embodiment of the present invention, FIG. 3 is a cross-sectional view of a vibration energy harvester (10) using dual resonance according to one embodiment of the present invention, FIG. 4 is a cross-sectional view of a second mass body (400) according to one embodiment of the present invention, FIG. 5 is a cross-sectional view of a first mass body (300) according to one embodiment of the present invention, and FIG. 6 is a cross-sectional view of a bobbin (200) according to one embodiment of the present invention.

[0022] Hereinafter, with reference to FIGS. 1 to 6, a vibration energy harvester (10) using dual resonance according to one embodiment of the present invention (hereinafter referred to as “energy harvester (10)”) will be described in detail.

[0023] The energy harvester (10) includes a main body (100), a bobbin (200), a first mass (300), a second mass (400), a magnet (500), a first elastic body (600), and a second elastic body (700).

[0024] Referring to Fig. 1, the main body (100) has a predetermined space formed therein, and a configuration for converting vibration energy into electrical energy is mounted thereon. In addition, the main body (100) may be formed in a cylindrical shape, but is not limited thereto.

[0025] Referring to Fig. 2, the central axis (110) is fixed at both ends to the upper and lower portions of the main body (100). For example, holes into which the central axis (110) can be inserted are formed at the upper and lower portions of the main body (100), and the upper and lower portions of the central axis (110) can be inserted into and fixed to the formed holes, but this is not limited thereto.

[0026] The bobbin (200) is fixed to the central axis (110) and the coil is wound. A detailed description of the bobbin (200) will be described later.

[0027] The first mass (300) is arranged to surround the outer surface of the bobbin (200) and moves along the central axis (110). Referring to FIG. 2, the first mass (300) is formed in a cylindrical shape, and at least one magnet (500) may be arranged between the inner surface of the first mass (300) and the bobbin (200).

[0028] The second mass body (400) is placed between the first mass body (300) and the main body (100), is formed to surround the outer surface of the first mass body (300), and moves along the central axis (110). In addition, the second mass body (400) may be formed in a cylindrical shape.

[0029] The magnet (500) is arranged adjacent to the bobbin (200) on the first mass body (300). For example, the magnet (500) may include a first magnet portion (510) and a second magnet portion (520) that are arranged at a predetermined distance apart in the longitudinal direction of the central axis (110). In addition, the first magnet portion (510) and the second magnet portion (520) may be formed such that the inner and outer peripheries thereof have opposite polarities, and the inner periphery of the first magnet portion (510) and the inner periphery of the second magnet portion (520) may be formed such that the inner periphery thereof has a south pole and the outer periphery thereof has a north pole, and the second magnet portion (520) may be formed such that the inner periphery thereof has a north pole and the outer periphery thereof has a south pole. In addition, the first magnet portion (510) and the second magnet portion (520) may be formed as a single ring-shaped magnet, but are not limited thereto and may be formed by arranging a plurality of magnets in a circular manner.

[0030] Referring to FIG. 3, the first elastic body (600) is placed between the first mass body (300) and the second mass body (400). In addition, the first mass body (300) and the second mass body (400) can be vibrated in the longitudinal direction of the central axis (110) by the first elastic body (600).

[0031] The second elastic body (700) is disposed between the second mass body (400) and the main body (100). In addition, the first mass body (300) and the second mass body (400) can be vibrated in the longitudinal direction of the central axis (110) by the second elastic body (700). In other words, the first mass body (300) and the second mass body (400) can be linearly vibrated by the first elastic body (600) and the second elastic body (700).

[0032] For example, the first elastic body (600) and the second elastic body (700) may be wave springs. The above-described wave spring is a spring that combines a conventional coil spring and a plate spring, and may have an overall shape similar to a coil spring, but a cross-section that has a rectangular shape like a plate spring.

[0033] Additionally, the first elastic body (600) and the second elastic body (700) may have the same resonant frequency. In this case, when the resonant frequencies of the first elastic body (600) and the second elastic body (700) are the same, the amount of motion can be amplified, thereby achieving the effect of securing a high amount of power generation.

[0034] In another embodiment, the energy harvester (10) may have different resonant frequencies for the first elastic body (600) and the second elastic body (700). In this case, when the first elastic body (600) and the second elastic body (700) have different resonant frequencies, the amount of movement for the two frequencies can be secured, thereby increasing the amount of power generated. In addition, the first elastic body (600) and the second elastic body (700) can easily change the resonant frequency by changing the number of turns and / or thickness of the spring.

[0035] Referring to FIGS. 3 and 4, the second mass body (400) may include a first support member (430) that supports the first elastic body (600), and the main body (100) may include a second support member (120) that supports the second elastic body (700).

[0036] The first support member (430) may be formed to protrude inwardly along the central periphery of the second mass body (400). At this time, the first elastic body (600) may be positioned respectively at the upper and lower portions of the first support member (430). Specifically, the first elastic body (600) may include a first upper elastic body (610) positioned at the upper portion of the first support member (430) and a first lower elastic body (620) positioned at the lower portion of the first support member (430).

[0037] In addition, referring to FIG. 5, the first mass body (300) may include a first upper support portion (310) that protrudes outwardly along the upper circumference and a first lower support portion (320) that protrudes outwardly along the lower circumference.

[0038] In other words, the first upper elastic body (610) may be supported at the lower part by the first support member (430) and at the upper part by the first upper support member (310). In addition, the first lower elastic body (620) may be supported at the lower part by the first lower support member (320) and at the upper part by the first support member (430).

[0039] The second support member (120) may be formed to protrude inwardly along the central periphery of the main body (100). At this time, the second elastic body (700) may be positioned respectively at the upper and lower portions of the second support member (120). Specifically, the second elastic body (700) may include a second upper elastic body (710) positioned at the upper portion of the second support member (120) and a second lower elastic body (720) positioned at the lower portion of the second support member (120).

[0040] In addition, referring again to FIG. 4, the second mass body (400) may include a second upper support portion (410) that protrudes outwardly along the upper periphery and a second lower support portion (420) that protrudes outwardly along the lower periphery.

[0041] In other words, the second upper elastic body (710) may be supported at the lower part by the second support member (120) and at the upper part by the second upper support member (410). In addition, the second lower elastic body (720) may be supported at the lower part by the second lower support member (420) and at the upper part by the second support member (120).

[0042] Referring to FIG. 6, the bobbin (200) may include a web portion (210) fixed to a central axis (110), a plurality of flange portions formed at a predetermined distance apart in the vertical direction, and a plurality of coil portions wound between the flange portions.

[0043] For example, the flange portion may include a first flange portion (220) formed to extend radially from the upper end of the web portion (210), a second flange portion (230) formed to be spaced apart in a downward direction from the first flange portion (220), a third flange portion (240) formed to be spaced apart in a downward direction from the second flange portion (230), and a fourth flange portion (250) formed to be spaced apart in a downward direction from the third flange portion (240) and formed at the lower end of the web portion (210).

[0044] Additionally, the coil portion may include a first coil portion (260) wound between the first flange portion (220) and the second flange portion (230), a second coil portion (270) wound between the second flange portion (230) and the third flange portion (240), and a third coil portion (280) wound between the third flange portion (240) and the fourth flange portion (250).

[0045] At this time, the magnet (500) may include a first magnet part (510) arranged at a position corresponding to the second flange part (230) and a second magnet part (520) arranged at a position corresponding to the third flange part (240). Accordingly, as the first magnet part (510) and the second magnet part (520) linearly vibrate, the direction of the magnetic flux passing through the coil part changes, so that electric energy can be generated.

[0046] The above description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0047] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0048] [Explanation of symbols]

[0049] 10: Vibration energy harvester using double resonance

[0050] 100: Body 110: Center axis

[0051] 120: Second support

[0052] 200: Bobbin 210: Web

[0053] 220: 1st flange part 230: 2nd flange part

[0054] 240: 3rd flange section 250: 4th flange section

[0055] 260: First coil section 270: Second coil section

[0056] 280: Third coil section

[0057] 300: First mass

[0058] 310: First upper support 320: First lower support

[0059] 400: Second mass

[0060] 410: Second upper support 420: Second lower support

[0061] 430: First support

[0062] 500: Magnet

[0063] 510: First magnet section 520: Second magnet section

[0064] 600: First elastic body

[0065] 610: First upper elastic body 620: Second lower elastic body

[0066] 700: Second elastic body

[0067] 710: Second upper elastic body 720: Second lower elastic body

Claims

In energy harvesters, entity; A central axis with two ends each fixed to the upper and lower portions of the main body; A bobbin fixed to the central axis and having a coil wound thereon; A first mass arranged to surround the outer circumference of the bobbin and moving along the central axis; A second mass disposed between the first mass and the main body, formed to surround the outer circumference of the first mass, and moving along the central axis; A magnet positioned adjacent to the bobbin in the first mass; a first elastic body disposed between the first mass body and the second mass body; and An energy harvester comprising a second elastic body disposed between the second mass body and the main body. In paragraph 1, An energy harvester wherein the first elastic body and the second elastic body have the same resonant frequency. In paragraph 1, An energy harvester wherein the first elastic body and the second elastic body have different resonant frequencies. In paragraph 1, The second mass includes a first support member that supports the first elastic body, An energy harvester, wherein the main body includes a second support member that supports the second elastic body. In paragraph 4, The above first support portion is formed to protrude inwardly along the central periphery of the second mass body, The above second support portion is formed to protrude inwardly along the central periphery of the main body, The first elastic body includes a first upper elastic body positioned above the first support portion and a first lower elastic body positioned below the first support portion, An energy harvester, wherein the second elastic body includes a second upper elastic body positioned above the second support portion and a second lower elastic body positioned below the second support portion. In paragraph 5, The first mass body includes a first upper support portion that protrudes outwardly along the upper circumference and a first lower support portion that protrudes outwardly along the lower circumference, An energy harvester, wherein the second mass body includes a second upper support portion that protrudes outwardly along the upper periphery and a second lower support portion that protrudes outwardly along the lower periphery. In paragraph 1, The above bobbin A web portion fixed to the central axis; A first flange portion extending radially from the upper end of the web portion; A second flange portion formed spaced apart in a downward direction from the first flange portion; A third flange portion formed spaced apart in a downward direction from the second flange portion; A fourth flange portion positioned downwardly from the third flange portion and formed at the lower end of the web portion; A first coil portion wound between the first flange portion and the second flange portion; A second coil portion wound between the second flange portion and the third flange portion; and An energy harvester comprising a third coil portion wound between the third flange portion and the fourth flange portion. In paragraph 7, The above magnet is A first magnet portion arranged at a position corresponding to the second flange portion; and An energy harvester comprising a second magnet portion arranged at a position corresponding to the third flange portion.

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