KR20160124567A - Piezoelectric Power generation apparatus - Google Patents

Piezoelectric Power generation apparatus Download PDF

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Publication number
KR20160124567A
KR20160124567A KR1020150055407A KR20150055407A KR20160124567A KR 20160124567 A KR20160124567 A KR 20160124567A KR 1020150055407 A KR1020150055407 A KR 1020150055407A KR 20150055407 A KR20150055407 A KR 20150055407A KR 20160124567 A KR20160124567 A KR 20160124567A
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South Korea
Prior art keywords
piezoelectric element
upper plate
impact
gear
piezoelectric
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KR1020150055407A
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Korean (ko)
Inventor
이재신
강진규
이창헌
홍영환
박영석
박창도
이동훈
Original Assignee
울산대학교 산학협력단
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Priority to KR1020150055407A priority Critical patent/KR20160124567A/en
Publication of KR20160124567A publication Critical patent/KR20160124567A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
    • H02N2/12—Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/08—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for recovering energy derived from swinging, rolling, pitching or like movements, e.g. from the vibrations of a machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

According to the present invention, a piezoelectric power generation apparatus includes: an upper plate of which the upper portion has a shape of a plane; a support unit supporting the upper plate and having a space formed therein; a connection unit connecting the support unit and the upper plate and prepared such that the upper plate can move in a vertical direction; a motion conversion unit converting a straight line motion of the upper plate into a rotary motion; an impact unit connected to the motion conversion unit to rotate; and a piezoelectric element unit prepared such that the end of the impact unit is impacted according to the rotation of the impact unit, thereby preventing the damage to a piezoelectric element even if a large load is applied.

Description

[0001] The present invention relates to a piezoelectric power generation apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power generation device using a piezoelectric element, and more particularly, to a piezoelectric power generation device that generates displacement through a piezoelectric element by using kinetic energy due to a load of a vehicle passing over a road,

Energy Harvesting is a new energy source for replacing existing energy sources such as fossil fuels and nuclear fuels. It converts energy from natural energy sources such as sunlight, vibration, heat, and wind power into electric energy It means technology to acquire. Energy harvesting using vibration energy is a technology that converts mechanical vibration into electric energy. It is a technology to convert waste energy generated by the activities of human body and machinery in daily life into electrical energy.

The piezoelectric material is a material having a piezoelectric effect which generates a dielectric field and generates a constant electric field when a pressure is applied from the outside to generate a displacement, and is utilized as a main material of energy harvesting using vibration energy.

BACKGROUND ART [0002] Piezoelectric power generation devices using vibration energy of a vehicle traveling on a road have been introduced as energy harvesting technology using a conventional piezoelectric body. A conventional piezoelectric power generator is embedded in a road, and a piezoelectric effect is generated by directly transmitting a load generated when a vehicle passes through the piezoelectric body.

However, according to the related art, since the load is directly transmitted to the piezoelectric body, there is a problem that when the large load is applied, the piezoelectric body is damaged.

(Patent Document 1) Korean Patent No. 10-0988077 (2010. 10. 08. Piezoelectric energy harvester for road)

An object of the present invention is to provide a piezoelectric power generation device which prevents a piezoelectric body from being damaged even when a large load is applied.

According to an aspect of the present invention, there is provided a piezoelectric device, comprising: A supporting portion having a space formed therein for supporting the upper plate, a connecting portion connecting the supporting portion and the upper plate, the connecting portion being capable of moving up and down the upper plate, a motion converting portion converting the linear motion of the upper plate into a rotary motion, And a piezoelectric element part that is connected to the motion converting part and rotates, and a piezoelectric element that is impacted to the end of the impact part according to the rotation of the impact part.

The connecting portion may include a cylinder and a spring.

In addition, the connection portion may include a damper to buffer the pressure transmitted to the upper plate.

In addition, the motion converting portion may include an external force transmitting portion formed with a straight tooth, and a gear portion formed with teeth around the circular portion.

Further, the gear portion may include at least one gear.

Further, the impact portion may have a plurality of blades.

The plurality of blades may have a symmetrical structure with respect to the center of rotation.

Further, the impact portion may include a striking portion connected to an end.

In addition, the hitting portion may be made of an elastic body such as rubber.

The hitting portion may be a roller.

Further, the roller may be provided with a clearance at a portion connected to the impact portion.

The piezoelectric element may include a supporting frame having an inner space having a radius of rotation of the impact portion, and a piezoelectric element disposed inside the supporting frame so as to contact the rotation radius of the impact portion.

In addition, the piezoelectric element may have a convex cross section.

In addition, the piezoelectric element may further include a protective layer provided on the surface.

The supporting frame may have a shape in which the portion where the piezoelectric element is disposed is convex toward the rotation center of the impact portion.

The piezoelectric power generator according to the present invention converts the linear kinetic energy due to the load into the rotational kinetic energy and keeps the displacement amount by the rotational motion constant to prevent the piezoelectric body from being broken.

1 is a view showing a piezoelectric power generator 100 according to an embodiment of the present invention.
2 is a view showing a connection unit 130 according to an embodiment of the present invention.
3 is a diagram illustrating a motion converting unit 140 according to an embodiment of the present invention.
4 is a view showing the impact portion 150 and the piezoelectric element portion 160 according to the embodiment of the present invention.
5 is a view showing the impact portion 150 according to the embodiment of the present invention.
6 is a view showing a striking part 152 according to an embodiment of the present invention.
Figs. 7 to 8 are views showing cross sections in which the piezoelectric element 162 is arranged in the support frame 161 according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

1 is a view showing a piezoelectric power generator 100 according to an embodiment of the present invention.

First, the configuration of a piezoelectric power generator 100 according to an embodiment of the present invention will be described. As shown in FIG. 1, a piezoelectric power generator 100 according to the present invention supports a top plate 110, a top plate 110 in the form of a plane for receiving a load of a vehicle passing over a road, A connection part 130 connecting the supporting part 120 and the upper plate 110 so that the upper plate 110 can vertically move up and down, a top plate 110, And an end portion of the impact portion 150 according to the rotation of the impact portion 150 and the impact portion 150 connected to the motion conversion portion 140 and rotating together with the motion conversion portion 140, And a piezoelectric element 160 which is provided to be impacted by the piezoelectric element 160.

The upper panel 110 is provided in the form of a plane so that the vehicle can be exposed through the road. The upper plate 110 is supported by the supporting portion 120 and has a sliding contact shape so that the upper end of the upper plate 110 abuts against the end of the supporting portion 120 so as not to deviate from the moving path while vertically moving up and down. Can be formed. At this time, it is preferable that the end of the upper plate 110 has a sufficient length to overlap with the end of the supporting part 120 even if the upper plate 110 and the supporting part 120 are spaced apart from each other by a maximum distance.

1 is a cross-sectional view showing a state where the end of the upper plate 110 is bent to be able to cover the end of the support 120. Conversely, the end of the support 120 is formed to cover the end of the upper plate 110 And so on.

The supporting unit 120 includes columns or blocks having a predetermined height to support the top plate 110 of the piezoelectric power generator 100 and includes devices for converting the vertical movement of the top plate 110 into electric energy A space is formed therein.

The connection unit 130 includes a cylinder so that the path of the upper plate 110 is maintained in a straight line and the vibration energy of the upper plate 110 is conserved while the upper plate 110 is supported at a constant height.

The motion converting unit 140 includes an external force transmitting unit 141 connected to the upper plate 110 to perform a linear motion and a gear unit 142 connected to the supporting unit 120 to fix the rotational center and to rotate . The external force transmitting portion 141 is connected to the lower portion of the upper plate 110 and vertically moves vertically together with the upper plate 110. The external force transmitting portion 141 is configured to extend in the downward direction of the upper plate 110, Respectively. A rack gear is provided on the side surface of the external force transmitting portion 141 with teeth formed along a straight line.

The gear portion 142 is a circular pinion gear having teeth formed along the periphery thereof and adapted to engage with a rack gear provided on a side surface of the external force transmitting portion 141. The gear portion 142 may be composed of one gear or may include two or more gears. 1 shows a structure in which the large gear 143 is in contact with the external force transmission portion 141 and the small gear 144 is in contact with the impact portion 150 to increase the rotation ratio of the impact portion 150. However, The connection order of the first gear 144 and the second gear 143 may be reversed so that the amount of rotation of the impact portion 150 due to the vertical movement of the upper plate 110 can be adjusted.

The impact portion 150 is connected to the gear portion 142 at a center portion of the rotation and has at least one blade having a predetermined length outward from the rotation center. In FIG. 1, the impact portion 150 is formed of a bar shaped like a "-" having two wings at an angle of 180 °. However, the impact portion 150 may have three or more blades.

The piezoelectric element portion 160 includes a support frame 161 configured to surround the periphery of the range in which the impact portion 150 rotates and a piezoelectric element 162 disposed on the inner surface of the support frame 161. The piezoelectric element part 160 has a part of or all of the inner surface thereof abutting the end of the radius of rotation of the impact part 150, and the piezoelectric element is disposed on the inner surface in contact with the end part.

Next, the operation of the piezoelectric power generator 100 according to the present invention will be described. When the vehicle is placed on the piezoelectric power generation apparatus 100, a force due to the load of the vehicle is transmitted to the upper plate 110, and the upper plate 110 moves downward. At this time, the joint between the end of the upper plate 110 and the end of the support 120 prevents the upper plate 110 from coming off the support portion 120 by preventing the upper plate 110 from coming off the support portion 120. The connection part 130 maintains the path so that the upper plate 110 can move vertically in a straight line and provides an elastic force so that the upper plate 110 can be moved up and down by vibration Allows you to exercise.

When the upper plate 110 is moved downward by the load of the vehicle, the external force transmitting portion 141 connected to the upper plate 110 also moves downward. The gear portion 142 engaged with the rack gear provided on the side surface of the external force transmission portion 141 rotates as the external force transmission portion 141 moves downward, The portion 150 rotates together with the gear portion 142.

When the impact portion 150 is rotated, the piezoelectric element 162 arranged to contact the end of the impact portion 150 by the support frame 161 bumps against the end of the impact portion 150 and receives a constant impact. The displacement of the piezoelectric element 162 is caused by the amount of the impact. At this time, the piezoelectric element 162 generates electric power corresponding to the displacement amount through the piezoelectric effect.

In particular, since the length of the impact portion 150 is kept constant, the displacement amount of the piezoelectric element 162 generated by the impact with the impact portion 150 is limited to a length overlapping the end portion of the impact portion 150. That is, in the conventional piezoelectric device, the load of the vehicle is directly applied to the piezoelectric element 162. Since a displacement amount of the piezoelectric element 162 increases by the magnitude of the load, when a load exceeding the limit strength of the piezoelectric element is applied The piezoelectric element 162 is broken. However, since the length of the impact portion 150 is kept constant only by the displacement of the upper plate 110 and the external force transmission portion 141, even though the load of the vehicle is large, The damper 162 can be prevented from being damaged.

After the vehicle has passed through the upper plate 110, the upper plate 110, which has moved downward due to the load, is lifted up again, and the impact plate 150 is moved in the direction opposite to the lowering direction of the upper plate 110 And impacts the piezoelectric element 162 while rotating. At this time, since the electric field generated by the piezoelectric element unit 160 is determined only by the displacement caused by the piezoelectric element 162, a current in a constant direction can be generated regardless of the rotation direction of the impact unit 150.

As described above, the upper plate 110 vibrates in a process of being restored to its original height by the elastic force given by the connection portion 130, so that the piezoelectric power generation device 100 according to the present invention can prevent the vibration of the upper plate 110 The power can be produced while repeating the rising and falling until the oscillation of the oscillator stops.

The relationship between the electric power produced by the piezoelectric power generator 100 according to the present invention can be quantified as shown in Equation (1).

Figure pat00001

Here, P denotes the amount of electric power to be produced, C denotes the capacitance of the piezoelectric element 162, V denotes the voltage generated by the piezoelectric element 162, and f denotes the frequency of the impulse applied to the piezoelectric element 162.

Figure pat00002

Here, g 33 denotes a piezoelectric coefficient, F denotes a load applied to the piezoelectric element 162, t denotes a thickness of the piezoelectric element 162, and A denotes an area of the piezoelectric element 162.

Using the equation (2) representing the relationship with respect to the voltage (V), the amount of power can be expressed by the following equation (3).

Figure pat00003

Here, d 33 is a piezoelectric constant, and d 33 and g 33 have the relationship shown in Equation (4).

Figure pat00004

From here,

Figure pat00005
Is the dielectric constant of vacuum,
Figure pat00006
Quot; refers to the relative dielectric constant of the piezoelectric element 162.

2 is a view showing a connection unit 130 according to an embodiment of the present invention. 2, the connection unit 130 according to the embodiment of the present invention includes a rod 131 connected to and fixed to the upper plate 110 and extending in the downward direction, A cylinder 133 which is connected and fixed and has a space therein and which can reciprocate in a vertical direction and a lower end of the cylinder 133 are in contact with an inlet of the cylinder 133, And a spring 132 having a side end in contact with a lower surface of the upper plate 110.

The upper end of the rod 131 is connected to and fixed to the lower surface of the upper plate 110, and the lower end of the rod 131 is inserted into the cylinder 133. The outer surface of the rod 131 contacts the inner surface of the cylinder 133 and the rod 131 moves along the inner surface of the cylinder 133 and thus can maintain a straight path. That is, the upper plate 110 can maintain a linear path by the rod 131 and the cylinder 133, and can minimize the force consumed in the horizontal direction by maintaining the linear path in the vertical direction.

The spring 132 is provided between the upper plate 110 and the supporter 120 to support the upper plate 110 and the supporter 120 so as to maintain a predetermined gap and to apply a large load to the upper plate 110 in a very short time So that the upper plate 110 to the support 120 are not damaged. The spring 132 provides an elastic force so that the upper plate 110 can continuously vibrate in a process of lowering the upper plate 110 downward by the load and then restoring the original height.

The connecting part 130 according to the embodiment of the present invention may further include a damping device 134 as shown in a dotted circle in FIG. The damping device 134 may include at least one or more apertured piston 136 and a fluid 135 filled within the cylinder 133. The damping device 134 is formed at a rate at which the upper plate 110 descends by using the resistance force generated when the fluid 135 filled in the cylinder 133 flows through the hole when the rod 131 and the piston 135 descend. . In other words, the damping device 134 can compensate the buffering effect of the spring 132 and protect the piezoelectric power generation device 100 from a large impact.

3 is a diagram illustrating a motion converting unit 140 according to an embodiment of the present invention. 3 (a), the upper end of the external force transmitting portion 141 is connected to and fixed to the lower surface of the upper plate 110, and the gear portion 142 is engaged with the side surface of the external force transmitting portion 141 . The external force transmitting portion 141 has a shape elongated like a rod and a saw tooth is formed on a side surface. The gear portion 142 is formed with teeth along the circumference of the circle. The external force transmitting portion 141 and the gear portion 142 constitute a structure of a rack and a pinion gear so as to convert the linear motion of the external force transmitting portion 141 into a rotational motion of the gear portion 142.

The gear portion 142 includes at least one gear including a large gear 143 in contact with the external force transmission portion 141. The gear portion 142 can adjust the final amount of rotation output by the gear portion 142 in accordance with the gear ratio of the large gear 143 and the small gear 144. [

As shown in Fig. 3 (b), the gear portion 142 may include a two-stage gear 145 to which gears having different teeth are connected. The space occupied by the gear portion 142 can be reduced by using the second gear 145 as compared with the case where the plurality of gears are connected along the circumference.

4 is a view showing the impact portion 150 and the piezoelectric element portion 160 according to the embodiment of the present invention. 4, the impact portion 150 is connected to the gear portion 142 and rotates, and the piezoelectric element portion 160 is formed so that a part or all of the inner surface of the piezoelectric element portion 160 has a peripheral end Or in contact with the end of the radius of rotation.

The impact portion 150 is composed of a wing 151 having a predetermined length so that an end of the impact portion 150 can contact or collide with the inner surface of the piezoelectric element portion 160 with respect to the center of rotation. The blade 151 is preferably made of a material having a predetermined rigidity and mass such as a metal or a polymer. The greater the mass and stiffness of the wing 151, the greater the amount of impact due to rotation. The impact portion 150 is preferably made of stainless steel as a material which does not rust, has excellent impact resistance, has a high specific gravity and can obtain a high impact amount. Among these, SUJ2, which is excellent in impact resistance, corrosion resistance and hardness, is used However, other stainless steels may be used.

In addition, the impact portion 150 may include a plurality of blades 151, thereby increasing the frequency of the impact according to the amount of rotation. At this time, the wings 151 preferably have a symmetrical structure with respect to the center of rotation. It is possible to prevent the centrifugal force generated according to the rotational speed of the impact portion 150 from being shifted to one side by making the wing 151 symmetrical.

The impact portion 150 may further include a striking portion 152 connected to an end of the wing 151. The striking part 152 may be composed of a wing 151 having high rigidity and an elastic body such as rubber in order to prevent the piezoelectric element part 160 from being damaged by direct impact.

The piezoelectric element part 160 and the piezoelectric element 162 that generate power through displacement generated when the impact part 150 is impacted by the rotation of the impact part 150 can be impacted to the end of the impact part 150 (Not shown).

The piezoelectric element 162 may be constituted by a piezoelectric ceramic, a piezoelectric polymer, or the like having a piezoelectric effect as a power generating device for forming an electric field when a displacement is generated by receiving pressure. The amount of electric power P produced by the piezoelectric element 162 is inversely proportional to the area A as described in Equation 3 and therefore the area of the piezoelectric element 162 is minimized by considering the area of the impact portion 150, Is determined.

The support frame 161 may surround the circumference of the impact portion 150 and may be circular or polygonal. In order to maximally transfer the force generated by the impact of the impact portion 150 to the piezoelectric element 162, the piezoelectric element 162 is disposed at a position closest to the rotation center of the impact portion 150, ) Is preferably disposed. In addition, since the amount of impact transmitted by the impact portion 150 is largest at 90 degrees, in order to increase the impact angle, the support frame 161 may be provided with a convex portion where the piezoelectric element 162 is disposed .

5 is a view showing the impact portion 150 according to the embodiment of the present invention. As shown in FIG. 5, the impact portion 150 may include a plurality of blades 151, and a striking portion 152 may be connected to an end of each of the blades.

6 is a view showing a striking part 152 according to another embodiment of the present invention. As shown in FIG. 6 (a), the striking part 152 may be provided in the form of a roller at the end of the wing 151. The impact portion 150 impacts the upper surface of the piezoelectric element 162 while rotating, so that the force in the vertical direction and the force in the horizontal direction simultaneously act on the surface of the piezoelectric element 162. At this time, the surface of the piezoelectric element 162 can be broken by a force in the horizontal direction. Since the force in the horizontal direction is determined by the frictional force between the end of the impact portion 150 and the surface of the piezoelectric element 162, the breakage of the piezoelectric element 162 due to frictional force can be reduced by constituting the impact portion 152 as a roller have.

As shown in FIG. 6 (b), the striking part 152 may be provided with a cavity formed therein and a shaft (not shown) connected to the end of the wing 151. A clearance is provided at a portion where the striking part 152 and the end of the wing 151 are connected to each other so that the striking part 152 can secure a clearance in a region where the piezoelectric element 162 contacts. Since the impact portion 150 is made of a material having high rigidity, when the area where the hitting portion 152 connected to the end of the impact portion 150 is in contact with the piezoelectric element 162 is deep, the piezoelectric element 162 may be broken However, if the clearance between the striking portion 152 and the piezoelectric element 162 is secured, the piezoelectric element 162 can be prevented from being broken.

7 is a cross-sectional view of a piezoelectric element 162 disposed on a support frame 161 according to an embodiment of the present invention. 7, the piezoelectric element portion 160 may further include a protective layer 163 on the upper surface of the piezoelectric element 162. [ As described above, when the impact portion 150 is rotated and impacts the piezoelectric element 162, the piezoelectric element 162 may be damaged by the force in the horizontal direction. At this time, the protective layer 163 covers and protects the surface of the piezoelectric element 162. In addition, the protective layer 163 can prevent the breakage of the piezoelectric element 162 due to the concentration of the impact by dispersing the impact over the area of the piezoelectric element 162. [

8 is a cross-sectional view of a piezoelectric element 162 disposed on a supporting frame 161 according to an embodiment of the present invention. As described above, the amount of impulse delivered to the piezoelectric element 162 is divided into a vertical component and a horizontal component. The larger the vertical component, the greater the amount of power produced by the piezoelectric element 162. As the angle of collision between the piezoelectric element 162 and the impact portion 150 approaches 90 degrees, the vertical component of the impact amount increases, so that the inner surface of the support frame 161 is formed in a convex shape, The angle of collision between the first and second electrodes 150 can be increased.

The preferred embodiments of the present invention have been described above. It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and alternative arrangements included within the spirit and scope of the appended claims. Of course.

100: power generator 110: top plate
120: support part 130:
131: load 132: spring
133: cylinder 134: damping device
140: motion converting unit 141: external force transmitting unit
142: gear portion 150: impact portion
151: wing 152:
160: Piezoelectric element part 161: Support frame
162: piezoelectric element

Claims (15)

An upper plate having a top in the form of a plane;
A support for supporting the upper plate and having a space therein;
A connection unit connecting the support unit and the upper plate, the upper plate being movable up and down;
A motion converting unit for converting a linear motion of the upper plate into a rotary motion;
A shock portion connected to the motion converting portion and rotating; And
And a piezoelectric element provided to be impacted to an end of the impact portion in accordance with the rotation of the impact portion.
The method according to claim 1,
Wherein the connecting portion includes a cylinder and a spring.
The method according to claim 1,
Wherein the connection portion includes a damping device for buffering a pressure transmitted to the upper plate.
The method according to claim 1,
Wherein the motion converting portion includes an external force transmitting portion formed with a straight tooth,
And a gear portion having teeth formed along the circumference of the circular shape.
5. The method of claim 4,
And the gear portion includes at least one gear.
The method according to claim 1,
Wherein the impact portion has a plurality of vanes.
The method according to claim 6,
Wherein the plurality of vanes have a symmetrical structure with respect to a center of rotation.
The method according to claim 1,
Wherein the impact portion includes a striking portion connected to an end.
9. The method of claim 8,
Wherein the hitting portion comprises an elastic body such as rubber.
9. The method of claim 8,
Wherein the hitting portion comprises a roller.
11. The method of claim 10,
Wherein the roller has a clearance at a portion connected to the impact portion.
The method according to claim 1,
The piezoelectric element portion
A support frame having an internal space with a radius of rotation of the impact portion; And
And a piezoelectric element disposed inside the support frame so as to be in contact with a turning radius of the impact portion.
13. The method of claim 12,
Wherein the piezoelectric element has a convex cross section.
13. The method of claim 12,
Wherein the piezoelectric element further comprises a protective layer provided on the surface.
13. The method of claim 12,
Wherein the support frame has a shape in which the portion where the piezoelectric element is disposed is convex toward the rotation center of the impact portion.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220087315A (en) * 2020-12-17 2022-06-24 재단법인 경북하이브리드부품연구원 Piezoelectric energy harvesting devices
KR20230007778A (en) * 2021-07-06 2023-01-13 한양대학교 산학협력단 Piezoelectric energy harvester

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100988077B1 (en) 2010-06-28 2010-10-18 한양대학교 산학협력단 Piezoelectric road energy harvester

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100988077B1 (en) 2010-06-28 2010-10-18 한양대학교 산학협력단 Piezoelectric road energy harvester

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220087315A (en) * 2020-12-17 2022-06-24 재단법인 경북하이브리드부품연구원 Piezoelectric energy harvesting devices
KR20230007778A (en) * 2021-07-06 2023-01-13 한양대학교 산학협력단 Piezoelectric energy harvester

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