KR101703658B1 - Energy harvester - Google Patents

Energy harvester Download PDF

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Publication number
KR101703658B1
KR101703658B1 KR1020150059783A KR20150059783A KR101703658B1 KR 101703658 B1 KR101703658 B1 KR 101703658B1 KR 1020150059783 A KR1020150059783 A KR 1020150059783A KR 20150059783 A KR20150059783 A KR 20150059783A KR 101703658 B1 KR101703658 B1 KR 101703658B1
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South Korea
Prior art keywords
magnet
magnet portion
magnetic flux
elastic
coil
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KR1020150059783A
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Korean (ko)
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KR20160128045A (en
Inventor
김재훈
안다훈
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한국철도기술연구원
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Priority to KR1020150059783A priority Critical patent/KR101703658B1/en
Publication of KR20160128045A publication Critical patent/KR20160128045A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems

Abstract

An energy harvester for converting vibration into electric energy, the energy harvester comprising: a housing having a predetermined space formed therein; A first magnet portion and a second magnet portion located inside the housing and spaced apart from each other by a predetermined distance, a coil portion disposed between the first magnet portion and the second magnet portion and fixed to the inner surface of the housing, A first magnetic flux guiding portion disposed at a predetermined distance in the upward direction of the magnet portion, a second magnetic flux guiding portion disposed at a predetermined distance apart in a downward direction of the second magnet portion, and a first magnetic flux guiding portion, And includes an elastic portion which is elastically supported.

Description

Energy harvester {ENERGY HARVESTER}

The present invention relates to an energy harvester, and more particularly, to an energy harvester for converting external vibrations into electric energy.

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 the waste energy from the surrounding area into electric energy that can be harvested or scavengeed.

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 Such as a DC / AC generator, a Piezoelectric transducer, a capacitor transducer, a photovoltaic cell, etc., can be used.

Generally, the power level achieved through energy harvesting techniques is 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.

Korean Patent Laid-Open Publication No. 10-2012-0024018 (entitled "Energy Harvester") discloses an energy harvester that converts vibration energy transmitted from the outside into electric energy.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an energy harvester which improves energy generation efficiency.

According to an aspect of the present invention, there is provided an energy harvester including: a housing having a predetermined space formed therein; A first magnet portion and a second magnet portion located inside the housing and spaced apart from each other by a predetermined distance, a coil portion disposed between the first magnet portion and the second magnet portion and fixed to the inner surface of the housing, A first magnetic flux guiding portion disposed at a predetermined distance in the upward direction of the magnet portion, a second magnetic flux guiding portion disposed at a predetermined distance apart in a downward direction of the second magnet portion, and a first magnetic flux guiding portion, And includes an elastic portion which is elastically supported.

According to the above-mentioned problem solving means of the present invention, electric energy can be generated semi-permanently by self-power generation using vibration energy generated from the inside or the outside.

Further, the rate of change of the magnetic flux passing through the cross section of the coil part is improved, and the energy generation efficiency can be greatly improved.

1 is a schematic diagram of a wireless sensor device according to an embodiment of the present invention.
2 is a conceptual diagram of an energy harvester according to an embodiment of the present invention.
3 is a perspective view of an energy harvester according to an embodiment of the present invention.
4 is a cross-sectional view taken along line A-A 'in Fig.
5 is a cross-sectional perspective view taken along line A-A 'in FIG.
6 is a cross-sectional perspective view of B-B 'of FIG. 3;
7 is a cross-sectional view of an energy harvester according to another embodiment of the present invention.
8 is a conceptual diagram of a conventional energy harvester.

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. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

FIG. 1 is a conceptual diagram of a wireless sensing device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of an energy harvester according to an embodiment of the present invention, and FIG. 3 is a schematic view of an energy harvester according to an embodiment of the present invention. 3 is a cross-sectional view taken along the line A-A 'in Fig. 3, Fig. 5 is a cross-sectional perspective view taken along the line A-A' Sectional view of an energy harvester according to another embodiment of the present invention, and Fig. 8 is a conceptual view of a conventional energy harvester.

Referring to FIG. 1, a wireless sensor device 10 according to an embodiment of the present invention may include an energy harvester 100, a communication module 200, and a sensing module 300. At this time, the communication module 200 receives the converted electric energy from the energy harvester 100, and transmits the sensed information measured through the sensing module 300. For example, vibration energy generated inside or outside can be converted into electric energy by using the energy harvester 100.

At this time, the source of the vibration energy may be a mechanical component, a mechanical structure or a transportation machine (a railway vehicle, an automobile, an aircraft, a ship, and the like) and a rotating machine (a motor, a pump, a plant, a reducer / a speed reducer, And may be included therein.

Hereinafter, an energy harvester 100 according to an embodiment of the present invention will be described.

First, referring to FIGS. 2 to 4, an energy harvester 100 according to an embodiment of the present invention will be described.

The energy harvester 100 includes a housing 110, a first magnet portion 120, a second magnet portion 130, a coil portion 140, a first magnetic flux guide portion 150, a second magnetic flux guide portion 160, and elastic portions 171, 172, 173, 174.

A predetermined space is formed in the housing 110, and magnet portions 120 and 130 and a coil portion 140 may be disposed in a predetermined space.

The magnet units 120 and 130 may include a first magnet unit 120 and a second magnet unit 130 located inside the housing and spaced apart from each other by a predetermined distance. At this time, the distance between the first magnet part 120 and the second magnet part 130 can be translated in the vertical direction while maintaining a certain distance.

The above-mentioned vertical direction may be the 12 o'clock and 6 o'clock directions of Fig.

The coil portion 140 may be disposed between the first magnet portion 120 and the second magnet portion 130 and may be fixed to the inner surface of the housing 110.

The first magnetic flux inducing unit 150 may be disposed at a predetermined distance in the upward direction of the first magnet unit 120.

The second magnetic flux inducing unit 160 may be disposed at a predetermined distance in the downward direction of the second magnet unit 130.

The elastic portions 171, 172, 173, and 174 may elastically support the first magnet portion 120 and the second magnet portion 130, respectively.

Referring to FIG. 2, the operation of the energy harvester 100 according to an embodiment of the present invention will be described.

The energy harvester 100 is configured such that the magnetic flux is induced along the first magnetic flux guiding portion 150 and the coil portion 140 by the first magnet portion 120 and the magnetic flux is induced along the second magnetic portion 130 by the second magnet portion 130, The magnetic flux may be induced along the magnetic flux inducing portion 160 and the coil portion 140.

More specifically, referring to FIG. 2A, when the first magnet portion 120 and the second magnet portion 130 are moved in the upward direction, the magnetic flux of the first magnet portion 120 is 1 magnetic flux induction unit 150 and the magnetic flux of the second magnet unit 130 may be guided to the coil unit 140. [

Accordingly, the magnetic flux generated by the first magnet unit 120 does not affect the coil unit 140 via the first magnetic flux guide unit 150, and is generated by the second magnet unit 130 Energy can be generated only by magnetic flux.

2 (b), when the first magnet portion 120 and the second magnet portion 130 are moved downward, the magnetic flux of the first magnet portion 120 is transmitted to the coil portion 140, And the magnetic flux of the second magnet portion 130 can be guided to the second magnetic flux guiding portion 160.

The magnetic flux generated by the second magnet portion 130 does not affect the coil portion 140 via the second magnetic flux guide portion 160 and is generated by the first magnet portion 120 Energy can be generated only by magnetic flux.

According to such a configuration, the energy harvester 100 has an effect of minimizing the operation of the magnetic flux generated by the surplus magnet to obstruct energy generation.

8, the conventional energy harvester 20 includes an upper magnet portion 21 and a lower magnet portion 22 spaced apart from each other by a predetermined distance, an upper magnet portion 21 and a lower magnet portion 22, And a coil part 23 which is arranged in the up-down direction and translationally moves.

In the conventional energy harvester 20 as described above, the coil portion 23 is affected by the magnetic flux of the upper magnet portion 21 and the lower magnet portion 22, and the electric energy generating efficiency is lowered.

8 (a), when the coil portion 23 moves upward, the magnetic flux of the upper magnet portion 21 not only passes through the coil portion 23, The magnetic flux of the coil 22 also passes through the coil part 23. 8 (b), when the coil portion 23 moves downward, the magnetic flux of the lower magnet portion 22 not only passes through the coil portion 23 but also flows through the upper magnet portion 21 The magnetic flux also passes through the coil part 23.

The magnetic flux of the upper magnet portion 21 and the lower magnet portion 22 is lower than that of the coil portion 23 even when the coil portion 23 is translated by the vibration, So that the efficiency of generating electric energy is lowered.

4, the energy harvester 100 is disposed on the front surface or the rear surface of the first magnet portion 120 and the second magnet portion 130 and includes a first magnet portion 120 and a second magnet portion 130 (Not shown).

In other words, the first magnet part 120 is fixed to the upper part of the inner side surface of the magnet part connection part 180, and the second magnet part 130 is fixed to the lower part of the inner side surface, The distance between the second magnet portions 130 can be fixed. Accordingly, the first magnet part 120 and the second magnet part 130 can translate in the vertical direction while maintaining a certain distance from each other in the vertical direction.

The first magnet portion 120 and the second magnet portion 130 may each be implemented as a single permanent magnet.

The first magnet portion 120 and the second magnet portion 130 are disposed between the permanent magnets 121 and 131 and the plurality of permanent magnets 121 and 131 arranged so as to face each other in polarity different from each other, 121 and 131. The spacers 122 and 132 may be spaced apart from each other.

A plurality of spacers 122 and 132 may be disposed between the permanent magnets 121 and 131 and may be disposed between the permanent magnets 121 and 131 so that the permanent magnets 121 and 131 may be arranged in the same magnetic direction in the left- Can be maintained. At this time, the width of the spacers 122 and 132 is preferably set to a proper width so that the electromagnetic induction between the permanent magnets 121 and 131 and the adjacent permanent magnets 121 and 131 can be smoothly performed.

Further, the spacers 122 and 132 may be ferromagnetic materials having a property of sticking to magnets, and may be illustratively iron, cobalt, nickel, and alloys thereof.

4 and 5, the first magnet portion 120 further includes a first permanent magnet fixing portion 123 which is located at both ends and fixes the permanent magnet 121 and the spacer 122, The magnet portion 130 may further include a second permanent magnet fixing portion 133 positioned at both ends and fixing the permanent magnet 131 and the spacer 132.

The first permanent magnet fixing portion 123 induces magnetic flux between the first magnet portion 120 and the first magnetic flux guide portion 150 and the second permanent magnet fixing portion 133 guides the magnetic flux between the second magnet portion 130 and the second magnetic flux inducing unit 160 can be induced.

The first permanent magnet fixing portion 123 and the second permanent magnet fixing portion 133 described above may be a ferromagnetic material having a property of sticking to a magnet, and may be illustratively iron, cobalt, nickel, and an alloy thereof.

More specifically, the first permanent magnet fixing portion 123 may protrude upward and downward from the permanent magnet 121 and the spacer 122 of the first magnet portion 120. Accordingly, when the first magnet portion 120 is moved in the upward direction, magnetic flux between the first magnet portion 120 and the first magnetic flux guide portion 150 is smoothly transmitted through the first permanent magnet fixing portion 123 Magnetic flux between the first magnet part 120 and the coil part 140 is smoothly guided through the first permanent magnet fixing part 123 when the first magnet part 120 is moved in the downward direction. .

The second permanent magnet fixing portion 133 may protrude upward and downward from the permanent magnet 131 and the spacer 132 of the second magnet portion 130. Accordingly, when the second magnet portion 130 is moved upward, the magnetic flux between the second magnet portion 130 and the coil portion 140 can be smoothly guided through the second permanent magnet fixing portion 133 The magnetic flux between the second magnet portion 130 and the second magnetic flux guiding portion 160 is smoothly guided through the second permanent magnet fixing portion 133 when the second magnet portion 130 is moved downward. .

The magnet portions 120 and 130 can be smoothly guided to the coil portion 140 or the magnetic flux guide portions 150 and 160 because the spacers 122 and 132 and the permanent magnet fixing portions 123 and 133 are made of the ferromagnetic material.

Further, the permanent magnets 121 and 131 and the spacers 122 and 132 may be coupled to each other through bonding, screwing, or whole molding.

The coil portion 140 has an H shape and includes a bobbin 142 whose outer surface is fixed to the inner surface of the housing 110 and a coil 141 which is wound on the web portion of the bobbin 142 .

Referring to FIG. 6, the energy harvester 100 may further include a linear guide portion 190 for guiding the magnet portion connecting portion 180 in a linear reciprocating motion in a vertical direction.

The straight guide part 190 is inserted into a guide hole 192 and a guide hole 192 formed on the front surface or the rear surface of the housing 110 in the up and down direction and has one side fixed to the magnet part connection part 180, And may include a fixing portion 191.

6, the guide hole 192 may be formed in the front surface or the rear surface of the housing 110 in the vertical direction. However, the guide hole 192 may be formed in the front surface or the rear surface of the housing 110, And may be formed in the side surface in the vertical direction.

The elastic portions 171, 172, 173, and 174 can elastically support the first magnet portion 120 and the second magnet portion 130.

The elastic portions 171,172,173 and 174 are formed so that the movement of the first magnet portion 120 and the second magnet portion 130 is controlled such that the first magnet portion 120 and the second magnet portion 130 and the coil portion 140 do not hit each other, The range can be limited.

The magnetic field of the first magnet unit 120 or the second magnet unit 130 and the coil unit 140 overlap each other when the first magnet unit 120 and the second magnet unit 130 translationally move, , That is, induction electromotive force can be generated through an electromagnetic induction process. In other words, the movement of the magnetic field of the first magnet part 120 or the second magnet part 130 and the coil part 140 overlap can generate the electromagnetic induction phenomenon, thereby generating the electric energy.

The elastic portions 171, 172, 173, and 174 may include first to fourth elastic members 171, 172, 173, and 174 disposed on the outer surfaces of the first magnet portion 120 and the second magnet portion 130, respectively.

More specifically, the elastic portions 171, 172, 173, and 174 include a first elastic body 171 coupled to one side of the first magnet portion 120, a second elastic body 172 coupled to the other side of the first magnet portion 120, A third elastic body 173 coupled to one side of the first and second magnet units 130 and a fourth elastic body 174 coupled to the other side of the second magnet unit 130.

The one side described above may be the 9 o'clock direction of Fig. 4 and the other side may be the 3 o'clock direction of Fig.

The first magnet unit 120 and the second magnet unit 130 are moved in the first and second directions by the first and second elastic members 171 and 172 coupled to the first magnet unit 120, The third elastic body 173 and the fourth elastic body 174 coupled to the second magnet part 130 are pulled and when the first elastic body 171 and the second elastic body 172 are pulled , The third elastic body 173 and the fourth elastic body 174 are compressed and can translate in the vertical direction.

At this time, the coil part 140 may overlap the magnetic field of the first magnet part 120 or the second magnet part 130 due to the translational movement of the magnet part connection part 180. Accordingly, the coil part 140 overlaps with the magnetic field of the first magnet part 120 or the second magnet part 130 to generate an electromagnetic induction phenomenon and generate electric energy.

As shown in Fig. 4, the elastic portions 171, 172, 173 and 174 can be constituted by at least one magnetic body pair, and their magnetic poles on the surfaces facing each other have the same magnetic poles, Function. It is preferable that the elastic portions 171, 172, 173, and 174 are spaced apart from each other by a sufficient distance so as not to affect the magnetic forces of the first magnet portion 120 and the second magnet portion 130.

The elastic portions 171, 172, 173, and 174 may be made of an elastic structure.

7, when the elastic parts 171, 172, 173 and 174 are constituted by the elastic structures 171, 172, 173 and 174, it is possible to guide the moving range in which the elastic structures are translated without the linear guide part 190 described above, There is a simple advantage. For example, the elastic structures 171, 172, 173, and 174 may be resilient structures such as coil springs, leaf springs, cantilever beams, and the like.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. 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 should be construed as being included within the scope of the present invention.

100: Energy harvester
110: Housing
120: first magnet section 121: permanent magnet
122: spacer 123: first permanent magnet fixing portion
130: second magnet part 131: permanent magnet
132: spacer 133: second permanent magnet fixing portion
140: coil part 141: coil
142: Bobbin
150: first magnetic flux guide portion 160: second magnetic flux guide portion
170: elastic portion 171: first elastic member
172: second elastic body 173: third elastic body
174: fourth elastic body
180: magnet portion connecting portion
190: linear guide portion 191: linear guide fixing portion
192: Guide hole

Claims (11)

1. An energy harvester for converting vibration into electric energy,
A housing having a predetermined space formed therein;
A first magnet portion and a second magnet portion located inside the housing and spaced apart from each other by a predetermined distance;
A coil portion disposed between the first magnet portion and the second magnet portion and fixed to an inner surface of the housing;
A first magnetic flux guiding part disposed at a predetermined distance in the upward direction of the first magnet part;
A second magnetic flux guiding portion disposed at a predetermined distance in a downward direction of the second magnet portion; And
And an elastic portion for elastically supporting the first magnet portion and the second magnet portion, respectively,
When the first magnet portion and the second magnet portion are moved in the upward direction,
The magnetic flux of the first magnet portion is guided to the first magnetic flux guide portion,
The magnetic flux of the second magnet portion is guided to the coil portion,
When the first magnet portion and the second magnet portion are moved in the downward direction,
The magnetic flux of the first magnet portion is guided to the coil portion,
And the magnetic flux of the second magnet portion is guided to the second magnetic flux guide portion.
delete delete The method according to claim 1,
Further comprising a magnet portion connecting portion located on a front surface or a rear surface of the first magnet portion and the second magnet portion and fixing the distance between the first magnet portion and the second magnet portion.
The method according to claim 1,
The first magnet portion or the second magnet portion
A plurality of permanent magnets arranged such that mutually different polarities face each other; And
And a spacer located between the permanent magnets and maintaining a gap between the permanent magnets.
6. The method of claim 5,
The first magnet portion
Further comprising a first permanent magnet fixing portion which is located at both ends and fixes the permanent magnet and the spacer,
The second magnet portion
And a second permanent magnet fixing portion located at both ends and fixing the permanent magnet and the spacer,
Wherein the first permanent magnet fixing portion induces magnetic flux between the first magnet portion and the first magnetic flux guiding portion,
And the second permanent magnet fixing portion induces magnetic flux between the second magnet portion and the second magnetic flux guiding portion.
The method according to claim 1,
The coil portion
A bobbin having an H-shape and having an outer surface of the flange portion fixed to an inner surface of the housing; And
And a coil wound around a web portion of the bobbin.
5. The method of claim 4,
Further comprising a linear guide portion for guiding the magnet portion connecting portion to linearly reciprocate in the vertical direction,
The straight guide portion
A guide hole formed on the front surface or the rear surface of the housing in a vertical direction; And
And a linear guide fixing portion inserted into the guide hole and having one side fixed to the magnet portion connecting portion.
The method according to claim 1,
The elastic portion
And an elastic body disposed on outer surfaces of the first magnet portion and the second magnet portion, respectively,
Wherein each of the elastic bodies includes a pair of magnetic bodies having the magnetic poles of the surfaces facing each other.
The method according to claim 1,
The elastic portion
And an elastic body disposed on outer surfaces of the first magnet portion and the second magnet portion, respectively,
Wherein each of the elastic members is composed of an elastic structure.
In a wireless sensor device,
An energy harvester as set forth in any one of claims 1 to 10,
And a communication module that receives the energy converted from the energy harvester and transmits measured sensing information.
KR1020150059783A 2015-04-28 2015-04-28 Energy harvester KR101703658B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102108112B1 (en) * 2018-11-28 2020-05-11 한국철도기술연구원 Energy harvester
KR102551883B1 (en) * 2021-08-27 2023-07-04 서울대학교산학협력단 Bi-stable soft electromagnetic actuator
KR102540799B1 (en) * 2022-11-07 2023-06-07 주식회사 다일솔루션 Haptic Actuator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259264A (en) 2007-04-02 2008-10-23 Toshiba Corp Oscillation power generating set
JP2010110039A (en) * 2008-10-28 2010-05-13 Isuzu Motors Ltd Direct-acting generator
JP2010525779A (en) * 2007-04-27 2010-07-22 パーペトゥーム、リミテッド A permanent magnet generator for converting mechanical vibration energy into electrical energy.
JP2010279145A (en) 2009-05-28 2010-12-09 Foster Electric Co Ltd Oscillating generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259264A (en) 2007-04-02 2008-10-23 Toshiba Corp Oscillation power generating set
JP2010525779A (en) * 2007-04-27 2010-07-22 パーペトゥーム、リミテッド A permanent magnet generator for converting mechanical vibration energy into electrical energy.
JP2010110039A (en) * 2008-10-28 2010-05-13 Isuzu Motors Ltd Direct-acting generator
JP2010279145A (en) 2009-05-28 2010-12-09 Foster Electric Co Ltd Oscillating generator

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