WO2015023015A1 - Système de récupération piézoélectrique utilisant une force de compression - Google Patents

Système de récupération piézoélectrique utilisant une force de compression Download PDF

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Publication number
WO2015023015A1
WO2015023015A1 PCT/KR2013/007393 KR2013007393W WO2015023015A1 WO 2015023015 A1 WO2015023015 A1 WO 2015023015A1 KR 2013007393 W KR2013007393 W KR 2013007393W WO 2015023015 A1 WO2015023015 A1 WO 2015023015A1
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WO
WIPO (PCT)
Prior art keywords
piezoelectric
fixture
compressive force
force
harvesting system
Prior art date
Application number
PCT/KR2013/007393
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English (en)
Korean (ko)
Inventor
성태현
정현준
히다까신이치
송준후
우민식
Original Assignee
(주)시드에너텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by (주)시드에너텍 filed Critical (주)시드에너텍
Priority to PCT/KR2013/007393 priority Critical patent/WO2015023015A1/fr
Publication of WO2015023015A1 publication Critical patent/WO2015023015A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • H10N30/304—Beam type
    • H10N30/306—Cantilevers

Definitions

  • a piezoelectric harvesting system using a compressive force is disclosed. More specifically, a piezoelectric harvesting system using a compressive force capable of significantly increasing the amount of power generated by applying a sufficient compressive force to the piezoelectric body while preventing damage to the piezoelectric body using mainly external force applied to the piezoelectric body as a compressive force is disclosed.
  • piezoelectric energy harvesting which can be used as renewable energy at relatively fine energy among recent renewable energy, has been studied, and much attention has been drawn to industrialization.
  • a piezoelectric system has a relatively low toughness of the piezoelectric body (a material having low toughness is very weak against tensile stress).
  • a piezoelectric system using a blow or vibration used so far i.e., a system in which tensile stress is applied to the piezoelectric body, is relatively low. Not only are they damaged in a short time of use, but there is a disadvantage that sufficient power generation cannot be obtained because the tensile stress applied to the piezoelectric body is small.
  • An object according to an embodiment of the present invention is to provide a piezoelectric harvesting system that can take the compressive force of the external force generated by the load and the strike and generate electrical energy using the same.
  • another object according to an embodiment of the present invention is to provide a piezoelectric harvesting system capable of preventing damage to the piezoelectric body by mainly applying a compressive force to the piezoelectric material having a weak property to the tensile force.
  • another object according to the embodiment of the present invention by applying a compressive force to the piezoelectric can use the high compressive stress characteristics of the piezoelectric, through which high compressive force can be applied to the piezoelectric itself, high repulsive force that takes a large force on the piezoelectric crystal It is to provide a piezoelectric harvesting system that can generate a high load capacity and, as a result, obtain a high generation amount from the piezoelectric body.
  • the piezoelectric material is provided with a piezoelectric material; And a fixture to which the piezoelectric body is attached; It includes, the piezoelectric body is attached to one surface on which the fixture is compressed, when a compressive force is applied to the fixture may be applied to the piezoelectric force to generate electrical energy.
  • the fixture further includes a fixing support to be mounted in a cantilever type, it is possible to apply a compressive force to the fixture by hitting an area of the fixture with the piezoelectric body is not attached.
  • it may further include a tension preventing member attached to the other surface of the fixture to prevent the fixture from being tensioned in the process of being restored after receiving the compressive force.
  • the coating on one surface of the piezoelectric may further include a coating to prevent the piezoelectric peeling off.
  • the position of the neutral axis (neutral axis) can be adjusted, as a result, the conventional piezoelectric harvesting that the compressive stress can mainly act on the piezoelectric, which is a tensile stress
  • the piezoelectric damage can be reduced as compared to the casting system, and high compressive stress is applied, thereby greatly increasing the amount of power generated.
  • the fixture may be manufactured in a plate type using stainless steel (stainless steel).
  • it may further include a crack which is mounted on the opposite side of one surface of the piezoelectric body attached to the fixed body to withstand the compressive force applied to the piezoelectric body.
  • the piezoelectric harvesting system according to an embodiment of the present invention, a fixed body, a piezoelectric material attached to one surface of the fixed body and provided with a piezoelectric material and a striking member hitting the other surface of the fixed body is not attached to the piezoelectric body.
  • the fixture may be bent toward the striking direction.
  • the apparatus may further include a tension preventing member attached to the other surface of the fixing body to reduce the degree of bending of the piezoelectric body in a direction opposite to the hitting direction.
  • the compressive force is applied among the external forces generated by the load and the hitting, and electric energy can be generated using the same.
  • a compressive force to the piezoelectric can use the high compressive stress characteristics of the piezoelectric, through which a high compressive force can be applied to the piezoelectric itself, thereby providing a high repulsive force and a high strength that takes a large force on the piezoelectric crystal It is possible to generate high power from the piezoelectric body.
  • the load on the fixing body is reduced to prevent deformation and damage of the fixing body.
  • the elastic force of the piezoelectric body itself is used, so that the burden on the fixing body is reduced, so that the thickness of the fixing body can be made thinner than before, thereby reducing the material cost and weight of the fixing body.
  • FIG. 1 is a view schematically showing a piezoelectric harvesting system using a compressive force according to an embodiment of the present invention.
  • FIG. 2 is a view schematically illustrating a coupling structure of the fixture and the piezoelectric body shown in FIG. 1.
  • FIG. 3 is a view for explaining the structure in which the piezoelectric body shown in FIG. 2 is coated with a coating agent.
  • FIG. 4 is a diagram illustrating a state in which a piezoelectric body is compressed when a force acts in one direction.
  • FIG. 5 is a diagram illustrating a state in which a piezoelectric body is compressed when a force in a direction opposite to that of FIG. 4 is applied.
  • FIG. 7 is a graph showing a change in power generation amount according to the number of revolutions when alternating tension and compression are applied with one piezoelectric body.
  • FIG. 1 is a view schematically showing a piezoelectric harvesting system using a compressive force according to an embodiment of the present invention
  • FIG. 2 is a view schematically showing a coupling structure of a fixture and a piezoelectric body shown in FIG. 3 is a view for explaining a structure in which the piezoelectric body shown in FIG. 2 is coated with a coating agent
  • FIG. 4 is a view illustrating a state in which the piezoelectric body is compressed when a force acts in one direction
  • FIG. The piezoelectric element is compressed when the force in the opposite direction to the force action direction is applied.
  • the piezoelectric harvesting system 100 using a compressive force includes a fixture 102, a piezoelectric member 103 attached to one surface of the fixture 102, and a piezoelectric harvesting system 100.
  • the fixing support 107 is fixed to one side of the fixing body 102 so that the fixing body 102 becomes a cantilever type, and it is mounted on the other surface of the fixing body 102 so that a tension force is generated in the fixing body 102. It may include a tension preventing member 105 to block.
  • the coating agent 104 may be coated on one surface of the piezoelectric material 103.
  • Fixing body 102 of the present embodiment is provided in a flat plate (plate) type can be mounted on the fixed support cantilever type, one side of the fixing body 102, in the present embodiment the piezoelectric material 103 is attached to the lower surface Can be.
  • the piezoelectric material 103 of the present embodiment is basically a ceramic piezoelectric element having a high generation amount, and has excellent physical flexibility, such that a polymer or a hybrid piezoelectric element in which a polymer and a ceramic are mixed may be used. Therefore, it is durable due to its excellent physical flexibility and is therefore easy to develop.
  • PVDF is basic, and may include barium titanate, PZT crystal, or PZT fiber.
  • Lead-free piezoelectric materials such as NKN, BZT-BCT, BNT, BSNN, and BNBN, PLZT, P (VDF-TrFE), quartz, tourmaline, Rochelle salt, barium titanate, dihydrogen phosphate Ammonium, ethylene tartarate, etc. can be used.
  • the type and material of the piezoelectric material 103 are not limited thereto, and it is natural that other materials may be used as long as sufficient power generation can be generated by external force.
  • the piezoelectric material 103 may be attached to one surface to be compressed when an external force is applied on both sides of the fixture 102, and when the external force is applied to the fixture 102 to deform the fixture 102, That is, when one surface of the fixture 102 is bent inward, the piezoelectric body 102 may also be compressed.
  • the fixture 102 may be made of a metal material, for example, stainless steel. Due to such a material, when a hit is applied to the fixing body 102, the fixing body 102 may be deformed in the compression direction, and when the external force is lost, the fixing body 102 may be returned to its original state. In addition, the durability can be minimized to minimize the occurrence of deformation.
  • the material of the fixing body 102 is not limited thereto.
  • the width of the fixture 102 of the present embodiment is formed to be wider than the width of the piezoelectric material 103, through which the deformation on the piezoelectric material 103 by the impact applied to one surface of the fixture 102, as well as to the external force It can maximize the hit area by
  • a coating agent 104 may be coated on the piezoelectric material 103 of the present embodiment to prevent the piezoelectric material 103 from peeling off.
  • the coating agent 104 of the present embodiment is made of a coating material that is ductile and can be coated as thin as possible. This is because, when the ductility of the coating agent 104 is poor, the coating agent 104 absorbs the compressive stress that must act on the piezoelectric member 103, so that a small force is applied to the piezoelectric member 103, and thus the amount of power generation can be reduced. In addition, when the coating agent 104 is thickly used, a tensile force rather than a compressive force is applied to the piezoelectric material 103, thereby reducing power generation as well as durability.
  • the piezoelectric harvesting system 100 may further include a striking member (not shown) that strikes the other surface of the fixture 102 to which the piezoelectric member 103 is not attached, and the fixture 102 may be bent toward the striking direction. have.
  • the piezoelectric member 103 is formed so that the compressive force mainly acts. This may be implemented by adjusting the thickness of the fixture 102 and the piezoelectric member 103, and adjusting the position of the neutral axes A1, A2, and neutral axes.
  • the compressive force may mainly act on the piezoelectric member 103, thereby reducing the damage of the piezoelectric member 103, and taking a high compressive stress, thereby reducing the amount of power generated by the conventional piezoelectric harvesting system in which tensile force is mainly applied. Can be increased.
  • the neutral axes A1 and A2 may be set to be the top or bottom of the piezoelectric member 103 according to the direction of the force F acting on the piezoelectric member 103.
  • the neutral shafts A1 and A2 are moved according to the state of the piezoelectric harvesting system of FIG. 4 and the magnitude of the force F applied to the piezoelectric harvesting system of FIG. 5, the thickness of the piezoelectric member 103 according to the respective situation. And the neutral shafts A1 and A2 are brought into place by adjusting the thickness of the fixture 102. At this time, when the direction of the force F is directed downward (see Fig. 4), the neutral axis (top) is placed on the top of the piezoelectric member 103 when the direction of the force F is directed upward (see Fig. 5). A1, A2) can be set to come.
  • the thinner the thickness of the fixture 102 the lower the movement of the system due to the movement in the negative direction. Since the piezoelectric material 103 may be cracked, the thickness of the fixture 102 may be set so that such a fear does not occur.
  • cracks may be formed on the other surface of the piezoelectric member 103 positioned on the opposite side of the surface of the fixed body 102 and the piezoelectric member 103 attached thereto.
  • the crack may be formed in a direction perpendicular to the compressive force applied to the piezoelectric material 103.
  • Such a crack may function to make the piezoelectric member 103 better withstand the compressive force.
  • the piezoelectric member 103 according to the present embodiment is compressively deformed, so that a high generation amount can be obtained even if there is a crack.
  • the tension preventing member 105 may be attached to one surface of the fixture 102 facing the piezoelectric member 103 of the present embodiment.
  • the tension preventing member 105 may prevent the piezoelectric body 103 from being deformed.
  • the piezoelectric member 103 when the piezoelectric member 103 is pressurized in the compression direction (strike direction), it may be bent upward while being bent, at which time the piezoelectric member 103 and the fixing body 102 are prevented from bending.
  • the 105 it is possible to prevent the tensile force from being applied to the piezoelectric member 103 due to the deformation.
  • the external force generated by the load and hitting the compressive force is applied and can be used to generate electrical energy, by applying a compressive force mainly to the piezoelectric material (103) of weak properties to the tensile force Damage to the piezoelectric member 103 can be prevented, and by applying a compressive force to the piezoelectric member 103, a high compressive stress characteristic of the piezoelectric member 103 can be used, and thus high compressive force can be applied to the piezoelectric member 103 itself. It is possible to create a high repulsion force and proof strength that takes a large force in the piezoelectric crystal, and as a result there is an advantage that can obtain a high power generation amount in the piezoelectric material (103).
  • the elastic force of the piezoelectric body 103 itself is sufficiently used to reduce the load on the fixing body 102 to prevent deformation and damage of the fixing body 102, and furthermore, the piezoelectric body 103 itself. Because of the use of the elastic force of the load on the fixture 102 is reduced, there is also an advantage that can reduce the material cost and weight of the fixture 102 by making the thickness of the fixture 102 thinner than conventional.
  • FIG. 6 is a graph showing a change in power generation amount according to the number of revolutions when alternating tension and compression are applied with one piezoelectric body.
  • the maximum amount of power generation is shown at 400 to 420 rpm in both the case where the tensile force is applied to the piezoelectric body and the compressive force is applied to the piezoelectric body.
  • the average power using the tensile force is about 45mW
  • the average power using the compressive force is about 65mW
  • the power generation using the tensile force is stopped at 530rpm, the power generation using the compression force can be seen through Figure 6 that the power generation is gradually reduced while continuing to generate power even beyond 650rpm, so the piezoelectric harvesting system using the compressive force is a system using the tensile force It can be seen that it has more excellent durability.
  • Figure 7 is a graph obtained by performing an optimization experiment of power generation using a compressive force with another piezoelectric body.

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

Le système de récupération piézoélectrique utilisant une force de compression, selon un mode de réalisation de la présente invention, comprend : un corps piézoélectrique comprenant un matériau piézoélectrique ; et un corps fixe auquel le corps piézoélectrique adhère, le corps piézoélectrique adhérant à une surface du corps fixe qui est comprimée, de sorte qu'une force de compression soit également appliquée au corps piézoélectrique lorsque la force de compression est appliquée au corps fixe, ce qui génère de l'énergie électrique. Selon un mode de réalisation de la présente invention, une force de compression est appliquée par une force externe provenant d'une charge ou d'un coup, qui est à son tour utilisée pour générer de l'énergie électrique.
PCT/KR2013/007393 2013-08-16 2013-08-16 Système de récupération piézoélectrique utilisant une force de compression WO2015023015A1 (fr)

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PCT/KR2013/007393 WO2015023015A1 (fr) 2013-08-16 2013-08-16 Système de récupération piézoélectrique utilisant une force de compression

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PCT/KR2013/007393 WO2015023015A1 (fr) 2013-08-16 2013-08-16 Système de récupération piézoélectrique utilisant une force de compression

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108448933A (zh) * 2018-04-18 2018-08-24 武汉珈鹰智能科技有限公司 一种基于压电材料的能量回收及转化储存装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090082527A (ko) * 2008-01-28 2009-07-31 한국과학기술원 압전소자, 압전소자를 이용한 발전장치 및 그 구동방법
JP2011097687A (ja) * 2009-10-28 2011-05-12 Kyocera Corp 発電部材およびこれを用いた発電装置
US20110148256A1 (en) * 2008-09-09 2011-06-23 Murata Manufacturing Co., Ltd. Piezoelectric Power Generator
JP2012235687A (ja) * 2007-10-16 2012-11-29 Murata Mfg Co Ltd 圧電ポンプおよび振動装置
KR20130016084A (ko) * 2011-08-04 2013-02-14 (주)시드에너텍 에너지 하베스팅 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012235687A (ja) * 2007-10-16 2012-11-29 Murata Mfg Co Ltd 圧電ポンプおよび振動装置
KR20090082527A (ko) * 2008-01-28 2009-07-31 한국과학기술원 압전소자, 압전소자를 이용한 발전장치 및 그 구동방법
US20110148256A1 (en) * 2008-09-09 2011-06-23 Murata Manufacturing Co., Ltd. Piezoelectric Power Generator
JP2011097687A (ja) * 2009-10-28 2011-05-12 Kyocera Corp 発電部材およびこれを用いた発電装置
KR20130016084A (ko) * 2011-08-04 2013-02-14 (주)시드에너텍 에너지 하베스팅 시스템

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108448933A (zh) * 2018-04-18 2018-08-24 武汉珈鹰智能科技有限公司 一种基于压电材料的能量回收及转化储存装置

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