KR101539340B1 - Energy harvester and wireless sensor device including the same - Google Patents

Abstract

The energy harvester converting the vibration generated from the excitation source according to the present invention into electricity includes a first elastic portion designed to vibrate in response to a vibration having a center frequency of the first oscillation frequency, A first magnetic body coupled to the first mass portion, a second elastic portion designed to vibrate in response to a vibration having a second vibration frequency as a center frequency, a second mass portion coupled to the second elastic portion, A second magnetic body coupled to the second mass portion, a central shaft to which the first elastic portion, the second elastic portion, the first mass portion, the second mass portion, the first magnetic body and the second magnetic body are coupled, And a coil portion disposed along the central axis and configured such that the first magnetic body or the second magnetic body is respectively drawn in accordance with the vibration of the first elastic portion or the second elastic portion, do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy harvester and a wireless sensor device including the energy harvester.

The present invention relates to an energy harvester, and more particularly, to a wireless sensor device including an energy harvester and a communication module coupled thereto.

Conventional railway monitoring systems rely on wireline sensor monitoring technology, which limits reliability and stability in maintenance, repair and management. Particularly, there is a problem that it is difficult to obtain real-time monitoring data on the main apparatuses of the vehicle itself because the railway vehicle's traveling and traveling devices are restricted in accessing parts and wired sensors.

For example, a conventional railway monitoring system can diagnose a railway vehicle condition only at a limited installation position by diagnosing a fault according to the state detection information detected by a sensor installed on a railway facility on the ground (or a maintenance window). Accordingly, there is a limit in that reliability of the diagnosis result is low, diagnosis after the occurrence of a failure is only possible, and prediction and prevention of a failure can not be performed by real-time monitoring of the state of the railway vehicle.

In order to solve such a problem, studies are underway to combine a wireless sensor for monitoring the operation state of each component of a railway vehicle. However, in the case of a wireless sensor, since power supply is not smooth, There have been attempts to add self-generating modules to perform self-generation.

Energy Harvesting technology is one of the representative technologies of self-generated modules. Energy harvesting technology is a technology that converts waste energy from the environment into electric energy that can be used by harvesting or scavenge. Energy harvesting technology absorbs natural light energy, low temperature cogeneration energy from a human body or a small engine, microvibration energy of a portable device mounting / attaching device, dissipated energy due to human physical activity, and thermoelectric Energy harvesting elements such as an electroluminescent element, an electrochemical reaction, a DC / AC generator, a piezoelectric transducer, a capacitor transducer, a photovoltaic cell and the like can be used. Generally, the power levels achieved through energy harvesting techniques are on the order of milliwatts (㎽) to about microwatts (.).

These energy harvesting techniques can be applied to various fields. For example, it is possible to utilize vibrations occurring in high-speed railways or vehicles, and the state of various systems such as a train operating system, a high-pressure system, a traction system, a braking system, an auxiliary power supply, May be coupled to a railway vehicle, and the sensed information may be transmitted over a wireless communication path.

In this regard, Korean Patent Laid-Open Publication No. 2013-0011471 (entitled "Multi-Degree-of-Freedom Vibration-Based Broadband Energy Harvesting Apparatus)" allows a rigid body to vibrate in multiple degrees of freedom, And a resonance frequency band for the resonance frequency band is widened so that electricity can be efficiently obtained in a wide frequency range.

However, since the above prior art does not consider all the vibration frequencies of the high-speed and low-speed sections, there is a limitation in expanding the frequency band that can be generated. Therefore, it is necessary to develop an energy harvester and a wireless sensor device combined with the energy harvester in consideration of the vibration frequency of the high speed and low speed sections.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the conventional art, and it is an object of the present invention to provide a method of setting a vibration frequency in a high speed section and a vibration frequency in a low speed section, And an object of the present invention is to provide a wireless sensor device in which a communication module is combined for an energy harvester performing self-power generation using vibration energy and for smooth wireless communication.

As a technical means for achieving the above technical object, an energy harvester converting the vibration generated from the excitation source according to the first aspect of the present invention into electricity is adapted to oscillate in response to a vibration having a center frequency of the first oscillation frequency A first mass portion coupled to the first mass portion, a first magnetic portion coupled to the first mass portion, a second elastic portion designed to vibrate in response to a vibration having a second vibration frequency as a center frequency, A second mass portion coupled to the second elastic portion, a second magnetic portion coupled to the second mass portion, the first elastic portion, the second elastic portion, the first mass portion, the second mass portion, the first mass portion, A third elastic portion coupled between the first mass portion and the second mass portion, and a third elastic portion disposed along the central axis, and the first magnetic material or the second magnetic material is disposed between the first elastic portion and the second elastic portion, Or second And a coil portion formed to be respectively inserted in accordance with the vibration of the elastic portion.

Also, the energy harvester converting the vibration generated from the excitation source according to the second aspect of the present invention into electricity may include a first center axis, a second center axis disposed along the first center axis, A first elastic part disposed on the first elastic part and designed to vibrate in response to the first elastic part, a first mass part disposed along the first central axis and coupled to the first elastic part, A second elastic portion disposed along the second central axis and designed to vibrate in response to a vibration having a center frequency of the second vibration frequency; A second magnetic body disposed along the second central axis and coupled to the second elastic portion, a second magnetic body disposed along the second central axis and coupled to the second mass portion, a second magnetic body disposed along the second central portion, The damping unit and arranged along the first central axis and the second center for connecting and includes a portion the nose of the first magnetic body and second magnetic body are respectively drawn in accordance with the vibration of the first elastic part and second elastic part.

A wireless sensor device according to a third aspect of the present invention includes an energy harvester, a communication module receiving the converted energy from the energy harvester, and transmitting sensed sensing information.

According to the above-described object of the present invention, the wireless sensor network system can be semi-permanently used by self-power generation using the vibration energy generated from the excitation source.

In addition, since both the vibration frequency in the high speed section and the vibration frequency in the low speed section are considered, the frequency band capable of generating power can be expanded.

1 is a view showing a wireless sensor device in which an energy harvester and a communication module are combined.
2 is a perspective view of an energy harvester section according to a first embodiment of the present invention.
3 is a front view of an energy harvester section according to the first embodiment of the present invention.
4 is a view showing a coil part.
5 is a view showing a state where the energy harvester and the support plate according to the first embodiment are combined.
6 is a perspective view of an energy harvester according to a second embodiment of the present invention.
7 is a front view of an energy harvester according to a second embodiment of the present invention.
8 is a perspective view of a cross section of a wireless sensor device according to a third embodiment of the present invention.
FIG. 9 is a view showing an example of a position where the wireless sensor device shown in FIG. 8 is installed.
10 is a flowchart illustrating a method of performing communication in a wireless sensor device according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. 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.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

1 is a view showing a wireless sensor device 10 in which an energy harvester and a communication module are combined.

The energy harvester converts the vibrations generated from the source into electricity. And the elastic member 20 is arranged to receive the vibration. At this time, the position of the elastic member 20 may be the upper surface of the energy harvester as shown in FIG. 1, but it is not particularly limited as long as it can receive the vibration generated from the vibration source.

Specifically, the elastic member 20 may include a spring 21, a mass body 22, and a damper 23. The spring 21 has a predetermined natural frequency according to the performance of the communication module 30 and can limit the frequency range. The mass body 22 can be disposed on the spring 21 to limit the magnitude of the acceleration and the acceleration of vibration applied to the communication module 30 is limited so that the communication module 30 can perform stable wireless communication And performance degradation can be minimized.

The damper 23 can restrict the displacement of the spring 21 and the mass body 22 and is disposed around the spring 21 and the mass body 22 to limit the displacement thereof. And the limiting effect by the mass body 22 can be improved.

The communication module 30 is fixed by the above-described elastic member 20, receives electricity converted from the energy harvester via the cable 40, and transmits the sensed information measured from the various sensors.

As described above, the energy harvester can be used as the wireless sensor device 10 in combination with the communication module. Hereinafter, the energy harvester according to the present invention and the wireless sensor device using the energy harvester according to the present invention will be described in detail .

3 is a front view of a section of the energy harvester 100 according to the first embodiment of the present invention, and Fig. 4 is a cross-sectional view of the energy harvester 100 according to the first embodiment of the present invention. Fig. 1 is a view showing a coil part included in the harvester 100. Fig.

Referring to FIGS. 2 and 3, the energy harvester 100 converts the vibration generated from the excitation source into electricity. The energy absorber 100 includes a first elastic portion 110, a first mass portion 120, a first magnetic body A second magnetic body 160, a center shaft 170, a third elastic portion 180, and a coil portion 190. The second elastic portion 140 includes a second elastic portion 140, a second mass portion 150, a second magnetic body 160, In this case, the source is a source of vibration that occurs over a wide frequency band, and is a source of mechanical parts, machine structures or transportation machines (railway cars, automobiles, aircraft, ships, etc.) and rotary machines (motors, pumps, Wind turbines, wind turbine blades, etc.).

The first elastic portion 110 is designed to vibrate in response to the vibration having the center frequency of the first vibration frequency. That is, the first elastic part 110 is designed to have a first elastic modulus k1 with the first vibration frequency as a center frequency, and is responsive to vibration.

The first mass part 120 is coupled to the first elastic part 110 and the first magnetic part 130 is coupled to the first mass part 120. Since the first mass portion 120 is coupled to the first elastic portion 110, the first elastic portion 110 vibrates together when it vibrates. Since the first magnetic body 130 is coupled to the first mass portion 120, the first magnetic body 130 oscillates together with the first mass portion 120 as they vibrate, and enters the coil portion 190 as described below.

The second elastic portion 140 is designed to vibrate in response to the vibration having the center frequency of the second vibration frequency. In other words, the second elastic part 140 is designed to have a second elastic modulus k2 with the second vibration frequency as a center frequency, and to respond to vibration.

The second mass portion 150 is coupled to the second elastic portion 140 and the second magnetic portion 160 is coupled to the second mass portion 150. The second mass portion 150 is coupled to the second elastic portion 140 so that the second elastic portion 140 vibrates together when the second elastic portion 140 vibrates in response to the vibration having the center frequency of the second vibration frequency. Since the second magnetic body 160 is coupled with the second mass portion 150, the second magnetic portion 160 vibrates together with the second mass portion 150 and is drawn into the coil portion 190.

On the other hand, the first vibration frequency may correspond to a predetermined first speed, and the second vibration frequency may correspond to a vibration frequency corresponding to a predetermined second speed or lower. At this time, the first speed may have a speed value faster than the second speed.

As described above, since the energy harvester 100 according to the present invention considers both the vibration frequency in the high speed section and the vibration frequency in the low speed section, it is possible to expand the frequency band capable of generating power.

In addition, the energy harvester 100 according to the present invention can be applied not only to the environment where the high speed section and the low speed section are clearly divided but also to the environment where the center frequency changes. For example, in the case of a transportation vehicle such as a railway vehicle or an automobile, the center frequency may be changed as the speed of the transportation machine changes, so that the energy harvester 100 according to the present invention can be applied. In addition, in the case of a rotating machine such as a motor or a pump, since the vibration frequency is changed when a lot of working load is applied to the rotating machine, the energy harvester 100 according to the present invention can be applied. As described above, the energy harvester 100 according to the present invention can produce electric power under various conditions such as a wide range of frequencies to be applied and a case where a dual frequency is applied.

The first elastic part 110, the second elastic part 140, the first mass part 120, the second mass part 150, the first magnetic body 130 and the second magnetic body 160 are connected to the center shaft 170 ). At this time, the first elastic portion 110, the second elastic portion 140, the first mass portion 120, the second mass portion 150, the first magnetic body 130, and the second magnetic body 160, And an opening portion through which the first electrode 170 passes, and each may be formed in a cylindrical shape. The outer surfaces of the first elastic portion 110 and the second elastic portion 140 may be formed in a radial shape. For example, it may be formed in a radial shape extending in a cross shape around the central axis 170.

On the other hand, the cylindrical shape in which the opening is formed is merely an example, and may be formed in various shapes according to the shape and purpose of the excitation source. In addition, the shapes of the first elastic portion 110 and the second elastic portion 140 may be various shapes as well as a cross-radiating shape.

In addition, the first mass portion 120 and the second mass portion 150 may be spaced apart from the coil portion 190 by a predetermined interval. The first magnetic body 130 or the second magnetic body 160 is attracted to the coil part 190 as the first mass part 120 or the second mass part 150 vibrates, .

The third elastic portion 180 is coupled between the first mass portion 120 and the second mass portion 150. The upper surface of the third elastic part 180 may be coupled to the first mass part 120 and the lower surface of the third elastic part 180 may be coupled to the second mass part 150. [ The first mass portion 120 coupled to the upper surface of the third elastic portion 180 is coupled to the lower portion of the first elastic portion 110 and the first magnetic portion 130 is coupled to the lower portion of the first mass portion 120 And may be introduced into the upper part of the coil part 190. [ The second mass portion 150 coupled to the lower surface of the third elastic portion 180 is coupled to the upper portion of the second elastic portion 140 and the second magnetic portion 160 is coupled to the second mass portion 150, And may be inserted into the lower portion of the coil portion 190. [

4, the coil portion 190 is disposed along the central axis 170 and the first magnetic body 130 or the second magnetic body 160 is disposed between the first elastic portion 110 and the second elastic portion 120, As shown in FIG. That is, when vibration occurs with the first oscillation frequency as a center frequency, the first magnetic body 130 coupled to the first mass portion 120 moves to the coil portion 190 as the first elastic portion 110 vibrates The second magnetic body 160 coupled with the second mass portion 150 is moved in the direction of the coil portion 150. As a result, 190, respectively. In this case, the first magnetic body 130 or the second magnetic body 160 is selectively inserted into the first magnetic body 130. In this case, when the first magnetic body 130 or the second magnetic body 160 is selectively driven, Or the second magnetic body 160 enters the coil part 190 and then comes out again, is repeatedly performed.

At this time, the coil part 190 may include hollow parts 191 and 193 formed on one side of the first magnetic body 130 and the other side of the second magnetic body 160. Accordingly, the first magnetic body 130 and the second magnetic body 160 can be selectively inserted into the coil portion 190. However, the coil part 190 shown in FIGS. 1 and 2 is formed by separating the hollow parts 191 and 193 into which the first magnetic body 130 and the second magnetic body 160 are inserted, And the first magnetic body 130 and the second magnetic body 160 can be selectively inserted.

The coil portion 190 has a first groove formed along the inner peripheral surface of the first mass portion 120, a second groove formed along the inner peripheral surface of the second mass portion 150, Each of the grooves may include a coil wound thereon. That is, the coil portion 190 may be formed in the form of a bobbin.

The coil part 190 has the hollow parts 191 and 193 formed therein so that the first magnetic body 130 and the second magnetic body 160 can be drawn in. The coil part 190 is formed in a bobbin shape, The first magnetic body 130 and the second magnetic body 160 are selectively drawn in accordance with the vibration, so that the vibration generated from the vibration source can be converted into electricity.

5 is a view showing a state where the energy harvester 100 according to the first embodiment and the support plate are coupled.

The energy harvester 100 according to the present invention can be fixedly installed to the excitation source by coupling the support plate. For this, the energy harvester 100 may include a lower support plate 101, a side support plate 103, and an upper support plate 105.

The lower support plate 101 may be fixed to the vibration source and may be connected to and fixed to the center shaft 170 and may be spaced apart from the second elastic portion 140. The side support plate 103 is connected to the lower support plate 101 and may be spaced apart from the circumferential surfaces of the first mass portion 120 and the second mass portion 150. The upper support plate 105 may be connected to and fixed to the center shaft 170 and may be connected to the side support plate 103 and spaced apart from the first elastic portion 110.

FIG. 6 is a perspective view of the energy harvester 200 according to the second embodiment of the present invention, and FIG. 7 is a front view of the energy harvester 200 according to the second embodiment of the present invention.

The energy harvester 200 according to the present invention includes a first center shaft 271, a first elastic part 210, a first mass part 220, a first magnetic body 230, a second center shaft 273, And includes a second elastic portion 240, a second mass portion 250, a second magnetic body 260, a damping portion 275, and a coil portion 290.

The energy harvester 200 according to the present invention is formed such that the central axis is divided into a first central axis 271 and a second central axis 273 disposed along the same axis as the first central axis 271. Instead of the third elastic part 180 included in the first embodiment, a damping part 275 connecting the first center shaft 271 and the second center shaft 273 is formed to absorb the vibration generated from the circle can do.

The first elastic portion 210 is disposed along the first central axis 271 and is designed to vibrate in response to a vibration having a center frequency of the first vibration frequency. That is, the first elastic part 210 is designed to have the first elastic modulus k1, and responds to the vibration having the first vibration frequency as the center frequency.

The first mass portion 220 is disposed along the first central axis 271 and is coupled to the first elastic portion 210. The first magnetic body 230 is disposed along the first central axis 271 and is coupled to the first mass portion 220. Since the first mass portion 220 is coupled with the first elastic portion 210, the first elastic portion 210 vibrates together when it vibrates. At this time, since the first magnetic body 230 is coupled with the first mass portion 220, the first magnetic portion 220 vibrates together with the first mass portion 220 to be selectively drawn into the coil portion 290.

The second elastic portion 240 is disposed along the second central axis 273 and is designed to vibrate in response to the vibration having the second vibration frequency as the center frequency. That is, the second elastic portion 240 is designed to have the second elastic modulus k2, and is responsive to the vibration having the second vibration frequency as the center frequency.

The second mass portion 250 is disposed along the second central axis 273 and is coupled to the second elastic portion 240. The second magnetic body 260 is disposed along the second central axis 273 and is coupled to the second mass portion 250. The second mass portion 250 is coupled with the second elastic portion 240 so that the second elastic portion 240 vibrates together when the second elastic portion 240 vibrates in response to the vibration having the center frequency of the second vibration frequency. At this time, since the second magnetic body 260 is coupled with the second mass portion 250, when the second mass portion 250 vibrates, the second magnetic body 260 vibrates together and enters the coil portion 290.

The first elastic portion 210, the second elastic portion 240, the first mass portion 220, the second mass portion 250, the first magnetic body 230, and the second magnetic body 260 are disposed in the first And includes an opening portion through which the central axis 271 or the second central axis 273 passes, and each may have a cylindrical shape. However, the cylindrical shape having the opening portion is merely an example, and may be formed in various shapes according to the shape and purpose of the vibration source.

In addition, the outer surfaces of the first elastic portion 210 and the second elastic portion 240 may be formed in a radial shape. For example, it may be formed in a radial shape extending in a cross shape around the central axis 271. Meanwhile, the shapes of the first elastic portion 210 and the second elastic portion 240 may be various shapes as well as a cross-radiating shape.

The coil portion 290 is disposed along the first central axis 271 and the second central axis 273 and the first magnetic body 230 or the second magnetic body 260 is disposed on the first elastic portion 210 or the second elasticity portion 273. [ Respectively. The first magnetic body 230 or the second magnetic body 260 is selectively inserted into the first magnetic body 230. When the first magnetic body 230 or the second magnetic body 260 is selectively driven, Or the second magnetic body 260 enters the coil part 290 and then comes out again.

The coil portion 290 includes hollow portions 291 and 293 formed on one side of the first magnetic body 230 and the other side of the second magnetic body 260. Accordingly, the first magnetic body 230 and the second magnetic body 260 can be selectively inserted into the coil portion 290. However, the coil portion 290 shown in FIGS. 5 and 6 is formed by separating the hollow portions 291 and 293 into which the first magnetic body 230 and the second magnetic body 260 are inserted, And one hollow portion may be formed to allow the first magnetic body 230 and the second magnetic body 260 to be selectively inserted.

The coil portion 290 has a first groove formed along the inner circumferential surface of the first mass portion 220, a second groove formed along the inner circumferential surface of the second mass portion 250, Each of the grooves may include a coil wound thereon. That is, the coil portion 290 may be formed in a bobbin shape as shown in FIG.

In addition, the coil portion 290 may be spaced apart from the first mass portion 220 and the second mass portion 250 by a predetermined interval. The coil portion 290 is formed to be spaced apart from the first mass portion 220 and the second mass portion 250 so that the first mass portion 220 or the second mass portion 250 vibrates, Or the second magnetic body 260 may be selectively inserted into the coil portion 290. [

As described above, the coil portion 290 has the hollow portions 291 and 293 formed therein so that the first magnetic body 230 and the second magnetic body 260 can be drawn in. The coil portion 290 is formed in a bobbin shape, The second magnetic body 230 and the second magnetic body 260 are selectively drawn in accordance with the vibration, so that the vibration generated from the vibration source can be converted into electricity.

On the other hand, the first vibration frequency corresponds to a vibration frequency corresponding to a predetermined first speed or more, and the second vibration frequency corresponds to a vibration frequency corresponding to a predetermined second speed or lower. At this time, the first speed has a speed value faster than the second speed. As described above, since the energy harvester 200 according to the present invention considers both the vibration frequency in the high speed section and the vibration frequency in the low speed section, it is possible to expand the frequency band that can be generated.

In addition, the energy harvester 200 according to the present invention can be applied not only to the environment in which the high speed section and the low speed section are clearly divided but also to the environment in which the center frequency changes, And can produce power under various conditions.

The energy harvester 200 according to the present invention may be fixedly installed with a circle having a support plate coupled thereto. To this end, the energy harvester 200 may include a lower support plate, a side support plate, and an upper support plate.

The lower support plate may be fixed to the circular arc and may be connected to and fixed to the second center shaft 273 and spaced apart from the second elastic portion 240. The side support plate may be connected to the lower support plate and spaced apart from the circumferential surfaces of the first mass portion 220 and the second mass portion 250. The upper support plate may be connected to and fixed to the first center shaft 271, connected to the side support plate, and spaced apart from the first elastic portion 210. The shape in which the energy harvester 200 according to the second embodiment of the present invention is combined with the support plate may be formed as shown in FIG. 4 in which the energy harvester 100 according to the first embodiment is combined with the support plate.

Meanwhile, the laminated structure of the energy harvester 200 according to the present invention can be formed as follows. One side of the damping portion 275 may be connected to the lower surface of the first central shaft 271 and the other side of the damping portion 275 may be connected to the upper surface of the second central shaft 273. [ The first mass portion 220 is coupled to the lower portion of the first elastic portion 210 and the first magnetic portion 230 is coupled to the lower portion of the first mass portion 220, Can be introduced. The second magnetic member 260 is coupled to the upper portion of the second mass portion 250 and the second mass portion 250 is coupled to the upper portion of the second elastic portion 240, Can be introduced.

That is, the first elastic portion 210, the first mass portion 220, and the first magnetic body 230 may be coupled to the upper portion of the energy harvester 200 in the order of the first central axis 271 The second elastic portion 240, the second mass portion 250, and the second magnetic body 260 in the order of the second center axis 273. A damping portion 275 is connected between the first central axis 271 and the second central axis 273. [ However, the order of stacking the energy harvesters 200 is not limited thereto, and the upper and lower parts may be coupled to each other and may be stacked and combined in various forms according to the purpose of use.

FIG. 8 is a perspective view of a cross section of a wireless sensor device 300 according to a third embodiment of the present invention, and FIG. 9 is a view showing an example of a location where the wireless sensor device 300 shown in FIG. 8 is installed.

The wireless sensor device 300 according to the present invention includes the energy harvester 100 and the communication module 30 according to the first and second embodiments of the present invention. At this time, the communication module 30 receives the converted energy from the energy harvester 100 and transmits the measured sensing information. The wireless sensor device including the energy harvester and the communication module may be formed in a structure as shown in FIG.

8, the energy harvester 100 may be inserted into the wireless sensor device 300 in a state where the lower support plate 101, the upper support plate 105 and the side support plate 103 are surrounded, 30 may be inserted into the interior of the wireless sensor device 300 while being surrounded by the housing portion 31 of a cylindrical shape.

Referring to FIG. 9, the wireless sensor device 300 according to the present invention may be disposed in the transportation means 400. That is, the wireless sensor device 300 according to the present invention includes a communication module and an energy harvester 100 and a communication module 30 according to the first and second embodiments of the present invention. The communication module 30 receives the converted energy from the energy harvester 100 and transmits the measured sensing information. In this case, the vehicle 400 may include one or more wheels 410. The wireless sensor device 300 may be attached to a part of the wheel 410 to receive energy from the energy harvester 100, Sensing information can be transmitted.

10 is a flowchart illustrating a method of performing communication in a wireless sensor device according to a fourth embodiment of the present invention.

The wireless sensor device 300 is driven by receiving the electricity converted by the energy harvester 100 generated from the excitation source (S110). At this time, the energy harvesters 100 and 200 according to the first and second embodiments of the present invention can be applied to the energy harvesters.

Next, the communication module 30 in the wireless sensor device 300 fixed by the elastic member 20 arranged to receive the vibration transmits the sensing information transmitted from the sensor (S120).

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

20: elastic member 21: spring
22: mass body 23: damper
30: Communication module 40: Cable
100: Energy harvester 101: Lower support plate
103: side supporting plate 105: upper supporting plate
110: first elastic part 120: first mass part
130: first magnetic body 140: second elastic part
150: second mass part 160: second magnetic body
170: center axis 180: third elastic section
190: coil part 191, 193: hollow part
271: first central axis 273: second central axis
275: Damping unit 300: Wireless sensor device
400: transportation means 410: wheel

Claims (13)

An energy harvester for converting vibrations generated from an excitation source into electricity,
A first elastic portion designed to vibrate in response to a vibration having a center frequency of the first vibration frequency,
A first mass portion coupled to the first elastic portion,
A first magnetic body coupled to the first mass portion,
A second elastic portion designed to vibrate in response to a vibration having a center frequency of the second vibration frequency,
A second mass portion coupled to the second elastic portion,
A second magnetic body coupled to the second mass portion,
A central axis to which the first elastic portion, the second elastic portion, the first mass portion, the second mass portion, the first magnetic body and the second magnetic body are coupled,
A third elastic portion coupled between the first mass portion and the second mass portion,
And a coil portion disposed along the center axis and configured to allow the first magnetic body or the second magnetic body to be respectively drawn in accordance with the vibration of the first elastic portion or the second elastic portion,
Wherein the first vibration frequency has a velocity value higher than the second velocity when the first vibration frequency is equal to or higher than a predetermined first velocity and the second vibration frequency is equal to or lower than a predetermined second velocity An energy harvester. The method according to claim 1,
Wherein the first elastic portion, the second elastic portion, the first mass portion, the second mass portion, the first magnetic body, and the second magnetic body each have an opening portion through which the central axis passes, . delete The method according to claim 1,
Wherein the coil portion includes a first groove formed along an inner circumferential surface of the first mass portion, a second groove formed along an inner circumferential surface of the second mass portion, and a coil wound around the first groove and the second groove, Harvester. The method according to claim 1,
A lower support plate fixedly installed on the vibrating source, fixed to the center shaft and connected to the center shaft, and spaced apart from the second elastic portion,
A side support plate connected to the lower support plate and spaced apart from a peripheral surface of the first mass portion and the second mass portion,
And an upper support plate connected to the center shaft and connected to the side support plate and spaced apart from the first elastic part. The method according to claim 1,
Wherein the first mass portion coupled with the upper surface of the third elastic portion is coupled to a lower portion of the first elastic portion, the first magnetic portion is coupled to a lower portion of the first mass portion,
Wherein the second mass portion coupled to the lower side of the third elastic portion is coupled to the upper portion of the second elastic portion and the second magnetic portion is coupled to the upper portion of the second mass portion and is drawn into the lower portion of the coil portion. An energy harvester for converting vibrations generated from an excitation source into electricity,
A first central axis,
A first elastic portion disposed along the first central axis and designed to vibrate in response to a vibration having a first vibration frequency as a center frequency,
A first mass portion disposed along the first central axis and coupled to the first elastic portion,
A first magnetic body disposed along the first central axis and coupled to the first mass portion,
A second central axis disposed along the same axis as the first central axis,
A second elastic portion disposed along the second central axis and designed to vibrate in response to a vibration having a second vibration frequency as a center frequency,
A second mass portion disposed along the second central axis and coupled to the second elastic portion,
A second magnetic body disposed along the second central axis and coupled to the second mass portion,
A damping portion connecting the first central axis and the second central axis;
And a coil portion which is disposed along the first central axis and the second central axis and in which the first magnetic body or the second magnetic body is respectively guided in accordance with the vibration of the first elastic portion or the second elastic portion,
Wherein the first vibration frequency has a velocity value higher than the second velocity when the first vibration frequency is equal to or higher than a predetermined first velocity and the second vibration frequency is equal to or lower than a predetermined second velocity An energy harvester. 8. The method of claim 7,
The first elastic portion, the second elastic portion, the first mass portion, the second mass portion, the first magnetic body, and the second magnetic body include openings through which the first central axis or the second central axis passes, The energy harvester. delete 8. The method of claim 7,
Wherein the coil portion includes a first groove formed along an inner circumferential surface of the first mass portion, a second groove formed along an inner circumferential surface of the second mass portion, and a coil wound around the first groove and the second groove, Harvester. 8. The method of claim 7,
A lower support plate fixed to the oscillating source, fixed to the second center shaft and connected to the second center shaft,
A side support plate connected to the lower support plate and spaced apart from a peripheral surface of the first mass portion and the second mass portion,
And an upper support plate connected to and fixed to the first center shaft and connected to the side support plate and spaced apart from the first elastic portion. 8. The method of claim 7,
The lower surface of the first central shaft is connected to one side of the damping portion, the upper surface of the second central shaft is connected to the other side of the damping portion,
Wherein the first mass portion is coupled to a lower portion of the first elastic portion, the first magnetic portion is coupled to a lower portion of the first mass portion,
Wherein the second mass portion is coupled to the upper portion of the second elastic portion and the second magnetic portion is coupled to the upper portion of the second mass portion and is drawn into the lower portion of the coil portion. In a wireless sensor device,
An energy harvester according to any one of claims 1 to 12, wherein the energy harvester and the energy harvester according to any one of claims 4 to 8 and 10 to 12,
And a communication module that receives the energy converted from the energy harvester and transmits measured sensing information.

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