KR101785419B1 - Piezoelectric energy harvesting system using wind power - Google Patents

Piezoelectric energy harvesting system using wind power Download PDF

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KR101785419B1
KR101785419B1 KR1020140179540A KR20140179540A KR101785419B1 KR 101785419 B1 KR101785419 B1 KR 101785419B1 KR 1020140179540 A KR1020140179540 A KR 1020140179540A KR 20140179540 A KR20140179540 A KR 20140179540A KR 101785419 B1 KR101785419 B1 KR 101785419B1
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magnet
magnetic force
piezoelectric
mounting plate
force generating
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KR1020140179540A
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KR20150069553A (en
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성태현
정현준
양찬호
김세빈
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주식회사 에이엠씨에너지
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

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  • Engineering & Computer Science (AREA)
  • Wind Motors (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

A wind turbine piezoelectric hovering system according to an embodiment of the present invention includes a propeller coupled to a rotary shaft and a rotary shaft, At least one magnetic force generating unit mounted on a rotating shaft; And at least one piezoelectric element having a magnet mounted on the mounting plate and magnetically interacting with the magnetic force generating section to generate vibration of the mounting plate to generate electric energy in the piezoelectric element, Module. According to the embodiment of the present invention, a magnetic force generating portion is provided on a rotary shaft of a rotating portion rotated by wind, and a magnet magnetically acting on the rotary shaft is provided in the piezoelectric module, thereby deforming the piezoelectric element when wind is blown, Can be generated.

Description

{Piezoelectric energy harvesting system using wind power}

A wind-driven piezoelectric harvesting system is disclosed. More particularly, a magnetic force generating unit is provided on a rotating shaft of a rotating part rotated by wind, and a magnet magnetically acting on the rotating shaft is provided in a piezoelectric module, so that when a wind is blown, a piezoelectric element is deformed to generate electric energy with high efficiency A wind turbine piezoelectric harvesting system is disclosed.

Among the various renewable energies, piezoelectric technology is an energy harvesting technology that can generate electricity by reusing energy that is thrown away. Examples of energy abandoned include mechanical vibrations, small hydrographs, wind forces, external forces caused by falling fluids, and human and animal movements.

On the other hand, interest in wind power generation systems, which are new renewable energy sources, is increasing worldwide. However, the wind turbine system has a drawback that it shows high efficiency only at a certain speed or more.

Therefore, in order to obtain higher efficiency and power generation, research is needed to apply a piezoelectric harvesting system to a wind power generation system.

An object of an embodiment of the present invention is to provide a magnetic force generating part in a rotary shaft of a rotating part rotating by wind and providing a magnet magnetically acting on the rotating part of the rotating part by a wind to deform the piezoelectric element when wind blows, Efficiency piezoelectric hubbing system capable of generating a high-efficiency electric power.

A wind turbine piezoelectric hovering system according to an embodiment of the present invention includes: a rotating part including a rotating shaft and a propeller coupled to the rotating shaft; At least one magnetic force generating unit mounted on the rotating shaft; And a magnet which is mounted on the mounting plate and magnetically interacts with the magnetic force generating section to vibrate the mounting plate to generate electric energy in the piezoelectric element, And the piezoelectric module is provided with a magnet magnetically acting on the rotary shaft of the rotary part of the rotary part rotated by the wind, so that when the wind is blown, The device can be deformed to generate electric energy with high efficiency.

According to one aspect, in the piezoelectric module, the mounting plate on which the piezoelectric element is mounted is provided in a cantilever type, and the piezoelectric element can be mounted on at least one surface of the mounting plate.

According to one aspect, a magnet mounting member for mounting the magnet is mounted on the free end of the mounting plate, and an S pole or an N pole magnet can be mounted in the magnet mounting member.

According to one aspect, the magnet may have only S-poles, only N-poles, or a combination of S-poles and N-poles.

According to one aspect of the present invention, the magnetic force generating portion is a permanent magnet, and the permanent magnet has a plurality of N poles arranged along the circumference of the rotation axis, a plurality of S poles arranged along the circumference of the rotation axis, And may be alternately arranged around the rotation axis.

According to one aspect of the present invention, the magnetic force generating unit includes a plurality of permanent magnets, and the plurality of permanent magnets may be disposed around the rotation axis at an angle of 90 degrees, 120 degrees, or 180 degrees.

According to one aspect, the apparatus may further include an additional electricity generating unit mounted on the mounting plate to additionally generate electrical energy by magnetic interaction.

According to one aspect of the present invention, the magnet is mounted on one side of the free end of the mounting plate, the additional electricity generating unit further includes an additional magnet mounted on the other side of the free end; And a coil through which the additional magnet penetrates when the additional magnet moves in response to the vibration of the mounting plate, wherein electrical energy is additionally generated by a magnetic flux change as the additional magnet reciprocates into the coil.

According to one aspect of the present invention, the at least one magnetic force generating portion is disposed as a plurality of magnetic force generating portions spaced along the rotation axis, and the at least one piezoelectric module includes a plurality of piezoelectric modules corresponding to the number of the plurality of magnetic force generating portions, And can be disposed corresponding to the negative spacing.

According to one aspect of the present invention, the rotary part is a vertical rotary part having the rotating shaft in a horizontal direction and the propeller in a vertical direction, or a vertical rotary part in which the rotary shaft has a vertical direction and the propeller has a horizontal direction, Shaped cylindrical portion.

According to one aspect of the present invention, the magnetic force applied to the magnets of the piezoelectric module can be adjusted through the arrangement of the magnetic poles of the permanent magnets provided in the magnetic force generating unit to match the resonance frequency of the piezoelectric elements.

According to the embodiment of the present invention, a magnetic force generating portion is provided on a rotary shaft of a rotating portion rotated by wind, and a magnet magnetically acting on the rotary shaft is provided in the piezoelectric module, thereby deforming the piezoelectric element when wind is blown, Can be generated.

1 is a perspective view illustrating a configuration of a wind turbine piezoelectric harvesting system according to an embodiment of the present invention.
2 is a front view of Fig.
Fig. 3 is a view of a magnetism generating portion and a piezoelectric module viewed from the other direction in Fig. 2;
FIG. 4 is a diagram showing a state in which an additional electricity generating unit is added to FIG. 3. FIG.
5 is a view showing a wind-induced piezoelectric harvesting system according to another embodiment of the present invention.
6 and 7 are graphs showing the outputs according to the types and the number of the magnetic poles of the magnetic force generating unit.

Hereinafter, configurations and applications according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description forms part of a detailed description of the present invention.

In the following description, well-known functions or constructions are not described in detail for the sake of clarity and conciseness.

2 is a front view of Fig. 1, Fig. 3 is a cross-sectional view illustrating a magnetism generating unit and a piezoelectric module of Fig. 2 viewed from different directions, Fig. Fig.

As shown in these drawings, the wind-driven piezoelectric harvesting system 100 according to an embodiment of the present invention includes a rotating unit 110, a magnetic force generating unit 120 mounted on the rotating unit 110, And a piezoelectric module 150 that interacts with the piezoelectric element 151 to generate electrical energy.

First, the rotary part 110 of the present embodiment includes a rotary shaft 112 arranged long in the horizontal direction, and a propeller 111 mounted on the front end of the rotary shaft 112 and rotated by wind . It is also possible to include a support member 114 for rotatably supporting the rotary shaft 112 at a plurality of portions and a power generator motor (not shown) connected to the rotary shaft 112 to generate power by rotation of the rotary shaft 112 have.

With this configuration, when the wind is blown, the propeller 111 is rotated and the rotary shaft 112 to which the propeller 111 is coupled is rotated. The magnetic force generating unit 120 mounted on the rotating shaft 112 also rotates.

On the other hand, the piezoelectric module 150 of this embodiment generates electric energy by vibration as shown in Figs. 1 to 3, and in this embodiment, uses a mutually magnetic action for generation of vibration.

The piezoelectric module 150 includes an upstanding standing portion 154, a mounting plate 152 mounted on the upper end of the standing up member 154 in a cantilevered manner, And a magnet 155 mounted on the free end of the mounting plate 152 and acting magnetically with the magnetic force generating unit 120. [ The piezoelectric module 150 may further include a magnet mounting member 156 for mounting the magnet 155 so that the magnet 155 can be firmly mounted on the mounting plate 152. [

First, the piezoelectric element 151 may be formed of a piezoelectric ceramic. If a strong external force is applied due to the material of the piezoelectric element 151, breakage such as breakage may occur. In order to prevent the piezoelectric element 151 from being damaged, at least one surface of the flexible SUS- And may have a structure that is mounted on the lower surface. However, the material of the mounting plate 152 is not limited to this, and the mounting position of the piezoelectric element 151 is not limited to this.

Further, the piezoelectric element 151 may be a hybrid piezoelectric element in which a polymer, polymer, and ceramic are mixed, because it is excellent in physical flexibility as well as ceramic piezoelectric elements basically having excellent power generation. It is therefore durable due to its excellent physical flexibility and is therefore easy to generate.

In addition, as the type of the piezoelectric element 151, the use of PVDF is basic and may include barium titanate, PZT crystal, or PZT fiber. In addition, lead-free piezoelectric materials such as NKN type, BZT-BCT type, BNT type, BSNN and BNBN type, PLZT, P (VDF-TrFE), quartz, tourmaline, rochelite, barium titanate, Ammonium, tartaric acid ethylenediamine, and the like.

However, the type and material of the piezoelectric element 151 are not limited thereto, and it is natural that other materials and the like can be used as long as they can generate a sufficient amount of power generation by external force.

2 and 3, a magnet 155 having an S pole and an N pole may be mounted on the magnet mounting member 156 of the piezoelectric module 150. However, the present invention is not limited thereto, and the magnet 155 may be composed of only the S-pole or only the N-pole.

In this configuration, for example, when a magnetic force is applied to the magnet 155, that is, when the attraction force acts, the magnet 155 is pulled downward so that the free end of the mounting plate 152 is pressed downward, It is moved to its original state by the restoring force of the mounting plate 152. [

This is also true when the magnet 155 is subjected to the repulsive force. If the free end of the mounting plate 152 is pressed upward as the magnet 155 is pushed upward due to the repulsive force and the repulsive force applied again is weakened or lost, 152 to the original state.

In this way, the mounting plate 152 is vibrated, so that vibration is generated in the piezoelectric element 151 mounted on the mounting plate 152 to generate electric energy.

When a magnetic force is applied to the magnet 155 of the piezoelectric module 150, deformation is generated in the piezoelectric element to generate electric energy. For this purpose, in this embodiment, And a magnetic force generating unit (120).

The magnetic force generating section 120 of this embodiment may be provided as a permanent magnet 121. [ The permanent magnet may be mounted in the housing 123 surrounding the rotating shaft 112 or may be mounted on the outer surface of the housing 123.

Although not shown, a plurality of permanent magnets having N poles can be mounted along the circumference of the rotation axis, or a plurality of permanent magnets having S poles can be mounted along the circumference of the rotation axis.

Alternatively, permanent magnets 121 made up of N poles 121N and S poles 121S may be alternately mounted along the circumference of the rotating shaft 112, as shown in Fig.

In addition, the plurality of permanent magnets 121 may be disposed at an angle of 90 degrees, 120 degrees, or 180 degrees with respect to the rotation axis 112, but the arrangement angle is not limited thereto.

When the magnetic force generating portion 120 having such a configuration is rotated, the magnetic force generating portion 120 may interact magnetically with the magnets 155 of the piezoelectric module 150. For example, when the magnetic force generating portion 120 of FIG. 3 is rotated by the rotation of the rotating portion 110, the N pole 121N and the S pole 121S constituting the magnetic force generating portion 120, The magnet 155 of the module 150 acts magnetically with each other and will act magnetically depending on the pole or the distance of the magnetism generating part 120 and the magnet 155, Vibration may be generated because an external force is applied to the vibration plate 152.

3, when the rotating shaft 112 is rotated by the rotation of the propeller 111, the magnetic force generating unit 120 rotates and the N pole 121N of the magnetic force generating unit 120, which is alternately arranged, And the S pole 121S pass under the magnet 155 of the piezoelectric module 150. [ The N pole 121 S and the S pole 121 S of the magnetic force generating unit 120 and the N pole and S pole of the magnet 155 mutually magnetize and pull or push each other so that the mounting plate 152 It can oscillate up and down. Then, the piezoelectric element 151 mounted on the mounting plate 152 can also vibrate and generate electrical energy.

The magnetic force applied to the magnet 155 of the piezoelectric module 150 may be adjusted through the magnetic pole arrangement of the permanent magnet 121 provided in the magnetic force generating unit 120 to match the resonance frequency of the piezoelectric element 151 .

On the other hand, the wind-induced piezoelectric harvesting system of the present embodiment includes an additional electricity generating unit 160 for generating additional electric energy, which will be described with reference to FIG.

FIG. 4 is a diagram showing a state in which an additional electricity generating unit is added to FIG. 3. FIG.

The additional electricity generating portion 160 of the present embodiment includes an additional magnet 161 disposed on the upper surface of the free end of the mounting plate 152 and an additional magnet 161 161 may include coils 165 through which additional magnets 161 pass. In FIG. 4, the coil 165 is shown as floating in the air. However, the coil 165 may have a structure in which the coil 165 is fixedly mounted.

In this case, the magnet 155 of the piezoelectric module 150 can be mounted on the lower surface of the free end. Therefore, when the magnetic force generating unit 120 is rotated by the rotation of the rotating shaft 112, the magnetic force generating unit 120 and the magnets 155 of the piezoelectric module 150 can mutually act to generate electric energy. Also, the free end of the mounting plate 152 is vibrated by this action. At this time, the additional magnet 161 of the additional electricity generating unit 160 reciprocates between the coils 165. As a result, magnetic flux changes and electric energy can be additionally generated.

That is, in addition to the generation of electric energy in accordance with the interaction between the magnetic force generating unit 120 and the piezoelectric module 150, the additional electric generating unit 160 can generate additional electric energy.

In this way, according to an embodiment of the present invention, the magnetic force generating part 120 is installed on the rotary shaft 112 of the rotating part 110 rotated by the wind, and the magnet 155 magnetically acting on the rotary shaft 112 is connected to the piezoelectric module 150, it is possible to generate electric energy with high efficiency by deforming the piezoelectric element 151 when the wind is blown.

In addition, in the case of wind power generation, there is a limit to show a high efficiency only at a certain speed or more. In the wind turbine-use piezoelectric hubbing system 100 of the present embodiment, electric energy is generated by magnetic interaction There are advantages to be able to.

Hereinafter, the configuration of a wind turbine-use piezoelectric hubbing system according to another embodiment of the present invention will be described, but the description of components that are substantially the same as those of the system of the above-described embodiment will be omitted.

5 is a view showing a wind-induced piezoelectric harvesting system according to another embodiment of the present invention.

As shown in the drawing, the wind turbine-using piezoelectric hubbing system 200 according to another embodiment of the present invention includes a plurality of magnetic force generators 220 on the rotary shaft 212, (Not shown).

Therefore, when the propeller 211 is rotated by the wind and the rotation axis 212 rotates, the plurality of magnetic force generating units 220 and the plurality of piezoelectric modules 250 act magnetically to generate electric energy. Can be further increased.

Hereinafter, with reference to a graph, the output according to the magnetic stimulation of the magnetic force generating unit 120 and the piezoelectric module 150 will be described.

6 and 7 are graphs showing the outputs according to the types and the number of the magnetic poles of the magnetic force generating unit.

Referring to FIG. 6, when the permanent magnet 121 of the magnetic force generating unit 120 is an N pole or an S pole, the output according to the wind speed can be known.

Referring to FIG. 7, when the permanent magnets 121 of the magnetic force generating unit 120 are formed of N poles (disposed at intervals of 180 degrees), or NS poles or SS poles, You can see the output.

In the above-described embodiment, the vertical rotation unit having the horizontal rotation axis and the vertical vertical rotation axis has been described. However, the horizontal rotation unit or the semi-cylindrical rotation unit is not limited thereto.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Wind Powered Piezoelectric Harvesting System
110:
111: Propeller
112:
120: magnetic force generating section
121: permanent magnet
150: Piezoelectric module
151: piezoelectric element
152: mounting plate
155: magnet
156: magnet mounting member
160: additional electricity generation unit

Claims (11)

A rotating part including a rotating shaft and a propeller coupled to the rotating shaft, the rotating part rotating by wind;
A plurality of magnetic force generators mounted on the rotating shaft;
And a magnet mounted on the mounting plate and magnetically interacting with the magnetic force generating section to generate electric energy in the piezoelectric element by vibrating the mounting plate, A plurality of piezoelectric modules; And
An additional electricity generating unit mounted on the mounting plate of each of the plurality of piezoelectric modules to additionally generate electrical energy by magnetic interaction;
/ RTI >
In the piezoelectric module, the mounting plate on which the piezoelectric element is mounted is provided in a cantilever type, the piezoelectric element is mounted on at least one surface of both surfaces of the mounting plate,
A magnet mounting member for mounting the magnet is mounted on the free end of the mounting plate, an S pole or N pole magnet is mounted in the magnet mounting member,
The magnetic force generating portion is a permanent magnet,
The magnet is mounted on one side of the free end of the mounting plate,
Wherein the additional electricity generating unit comprises:
An additional magnet additionally mounted on the other side of the free end; And
And a coil through which the additional magnet passes when the additional magnet moves along with the vibration of the mounting plate,
Electric energy is additionally generated as the additional magnet reciprocates into the coil and the flux changes,
Generating an electric energy in the piezoelectric element by mutual magnetic action generated between the magnetic force generating portion and the piezoelectric module when the magnetic force generating portion is rotated by the rotation of the rotating portion,
Generating additional electric energy by causing a magnetic flux change as the additional magnet of the additional electricity generating portion reciprocates between the coils when the mounting plate vibrates according to the mutual magnetic action,
Wherein the number of the plurality of piezoelectric modules corresponds to the number of the plurality of magnetic force generating portions and is arranged corresponding to the spacing arrangement of the magnetic force generating portions,
Wherein when the propeller is rotated by the wind, the plurality of magnetic force generating units and the plurality of piezoelectric modules mutually operate magnetically to generate electric energy.
delete delete delete delete The method according to claim 1,
The magnetic force generating portion includes a plurality of permanent magnets,
Wherein the plurality of permanent magnets are disposed around the rotation axis at an angle of 90 degrees, 120 degrees, or 180 degrees.
delete delete delete The method according to claim 1,
Wherein the rotary part is a vertical rotary part in which the rotary shaft has a horizontal direction and the propeller has a vertical direction, or a vertical rotary part in which the rotary shaft has a vertical direction and the propeller has a horizontal direction, or the propeller is a semi-cylindrical rotary Mrs, Wind Powered Piezoelectric Harvesting System.
The method according to claim 1,
Wherein a magnetic force applied to the magnet of the piezoelectric module is adjusted through a magnetic pole arrangement of a permanent magnet provided in the magnetic force generating portion to match the resonance frequency of the piezoelectric element.
KR1020140179540A 2013-12-13 2014-12-12 Piezoelectric energy harvesting system using wind power KR101785419B1 (en)

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KR20190091875A (en) 2018-01-29 2019-08-07 부산대학교 산학협력단 Energy harvester utilizing upward flow pressure of heated air
KR20210065235A (en) 2019-11-26 2021-06-04 중앙대학교 산학협력단 Self-tuning wind energy harvester based on vortex-induced vibration
KR20220077253A (en) 2020-12-01 2022-06-09 중앙대학교 산학협력단 Flow rate response type energy harvester

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CN106050572B (en) * 2016-07-16 2019-03-29 北京工业大学 A kind of broadband wind-induced vibration piezoelectric energy collector
WO2018236061A1 (en) * 2017-06-21 2018-12-27 주식회사 에이엠씨글로비즈 Non-contact continuous piezoelectric generator using magnetic force
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CN108590973B (en) * 2018-04-26 2019-06-07 大连理工大学 A kind of flowed energy conversion equipment based on piezoelectricity
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JP2006291842A (en) * 2005-04-11 2006-10-26 Taiheiyo Cement Corp Wind power generation device

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KR20190091875A (en) 2018-01-29 2019-08-07 부산대학교 산학협력단 Energy harvester utilizing upward flow pressure of heated air
KR20210065235A (en) 2019-11-26 2021-06-04 중앙대학교 산학협력단 Self-tuning wind energy harvester based on vortex-induced vibration
KR20220077253A (en) 2020-12-01 2022-06-09 중앙대학교 산학협력단 Flow rate response type energy harvester

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