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POWER GENERATION ELEMENT AND ACTUATOR USING STRUCTURE OF SAID POWER GENERATION ELEMENT achieved

Foreign code F150008410
File No. 2013-059WO
Posted date Aug 20, 2015
Country WIPO
International application number 2015JP055368
International publication number WO 2015141414
Date of international filing Feb 25, 2015
Date of international publication Sep 24, 2015
Priority data
  • P2014-053551 (Mar 17, 2014) JP
Title POWER GENERATION ELEMENT AND ACTUATOR USING STRUCTURE OF SAID POWER GENERATION ELEMENT achieved
Abstract Provided is a power generation element, the vibration of which can be maintained long by suppressing the kinetic energy loss during vibration, and also provided is an actuator using the structure of this power generation element. A reverse magnetostrictive power generation element of the present invention comprises: a first power generation portion consisting of a first magnetostrictive rod formed of a magnetostrictive material, a first coil wound around the first magnetostrictive rod, and a first magnetic rod having a rigidity and shape for applying a uniform compressive or tensile force to the first magnetostrictive rod and disposed in parallel with the first magnetostrictive rod; a frame formed of a magnetic material curved in a U-shape and having one end and the other end positioned on mutually opposite sides of the curved portion, wherein the one end becomes a fixed end and the other end becomes a free end; and a magnet. The first power generation portion is attached to the free end-side frame and the magnet is attached to only any one of the two inner side surfaces of the frame facing each other, thereby allowing a part of the frame to function as a back yoke and forming an air gap between the magnet and the inner side surface on the side to which the magnet is not attached.
Outline of related art and contending technology BACKGROUND ART
In recent years, a technique familiar vibration used for power generation has advanced the development of, a ferromagnetic body 1 of the techniques is one of the magnetostrictive effect is utilized. Magnetostrictive effect of the ferromagnetic body when applying magnetic fields (when the magnetization of the ferromagnetic material) refers to the effect of deformation, the deformation amount due to the magnetostrictive effect is referred to as a material having a large magnetostrictive material. The magnetostrictive material may also, due to the addition of an external force and the compressive/tensile stress therein was deformed, largely change the magnetization (magnetic force line) also includes a inverse magnetostriction effect, such as a compression force to the magnetic field lines also lies in the range of 1 to change the material. Inverse magnetostriction effect in magnetic flux density due to the temporal change in the power generation element is used the addition of small external force can be generated by the high efficiency have attracted attention.
Developed by the inventors of the present example for a basic structure of the power generation element will be described (see Fig. 1 and 2 of Patent Document 1). The power generating element is a magnetostrictive rod of the coil 2 is wound in a horizontal plane parallel to the light valves in the horizontal direction, the yoke is bonded to the front and rear ends thereof in parallel to the beam structure. In addition, the magnetostrictive rod in the vicinity of the front and rear ends of each permanent magnet is magnetized, the permanent magnet before and is bridged between the back yoke. The back yoke is in order to increase the bias magnetization of the magnetostrictive rod of the object, each of the lines of magnetic force from the permanent magnet passes through the magnetostrictive rod and the back yoke to form one magnetic circuit. The power generating element and the fixed end to one end of the cantilever structure, the free end side of the force added to the horizontal plane is bent, for example the right side of the magnetostrictive rod compression force can be exerted in the axial direction, the magnetic field lines by the inverse magnetostriction effect is reduced, the magnetostrictive rod in the axial direction is the left side of the tensile force is applied, the magnetic field lines by the inverse magnetostriction effect is increased. The cantilevered structure of the power generation element (vibration) is applied to the external force in the horizontal plane within each of the magnetostrictive rod changes along the alternating magnetic field lines passing through and thus, the voltage proportional to the temporal change of the field lines occurs based on the law of magnetic induction coil to generate a voltage (electromotive force), which are taken out as electrical energy in the mechanism.
Scope of claims (In Japanese)請求の範囲 [請求項1]
 磁歪材料からなる第1の磁歪棒、第1の磁歪棒に巻かれる第1のコイル、第1の磁歪棒に一様な圧縮力又は引張力を加えるための剛性及び形状を有しており当該第1の磁歪棒と平行に配置される第1の磁性棒から構成される第1の発電部と、コ字状に屈曲した磁性材料からなり当該屈曲箇所を挟んで一方の端部が固定端、他方の端部が自由端になるフレームと、磁石とを備えており、
 前記第1の発電部を前記フレームの自由端側及び/又は前記屈曲箇所に取り付け、
 前記磁石を前記フレームのうち互いに対峙する2つの内側面のいずれか一方にのみ取り付けることで、フレームの一部をバックヨークとして機能させると共に当該磁石を取り付けない側の内側面と当該磁石との間に空隙を形成し、
 外力の付加により当該自由端側のフレームと固定端側のフレームを共に振動させることを特徴とする逆磁歪式の発電素子。

[請求項2]
 前記第1の発電部を前記フレームの自由端側に取り付ける場合に、
 磁歪材料からなる第2の磁歪棒、第2の磁歪棒に巻かれる第2のコイル、第2の磁歪棒に一様な圧縮力又は引張力を加えるための剛性及び形状を有しており当該第2の磁歪棒と平行に配置される第2の磁性棒から構成される第2の発電部を備え、
 前記第2の発電部を前記固定端側のフレームに取り付けると共に、前記屈曲箇所を通って前記フレームを自由端側と固定端側とに二分する直線を対称軸として、前記第1の磁歪棒、第1の磁性棒、第2の磁歪棒及び第2の磁性棒を線対称に配置することを特徴とする請求項1に記載の発電素子。

[請求項3]
 前記第1の発電部を前記フレームの自由端側に取り付ける場合に、
 前記屈曲箇所を通って前記フレームを自由端側と固定端側とに二分する直線に対して、前記磁歪棒を前記磁性棒よりも遠い位置に配置することを特徴とする請求項1又は2に記載の発電素子。

[請求項4]
 前記第1の発電部を前記フレームの屈曲箇所に取り付ける場合に、
 前記磁歪棒を前記フレームの外側面に配置し、前記磁性棒を前記フレームの内側面に配置することを特徴とする請求項1又は2に記載の発電素子。

[請求項5]
 前記磁歪棒を前記フレームに対して半田付け、蝋付け、溶接若しくはボルト締め又はこれらの組み合わせにより接合することを特徴とする請求項1~4のいずれか一項に記載の発電素子。

[請求項6]
 フレームの長手方向がほぼ水平になるように配置した場合に、前記自由端側の端部であって前記固定端の直上に錘を取り付けることを特徴とする請求項1~5のいずれか一項に記載の発電素子。

[請求項7]
 請求項1~6のいずれか一項に記載の発電素子を2つ備えており、各発電素子のフレームの自由端側同士及び固定端側同士を連結することで、2つの発電素子が連結箇所を挟んで対称に変形することを特徴とする発電素子。

[請求項8]
 請求項1~7のいずれか一項に記載の発電素子と同一の構造を備えており、前記コイルに電流を流すことで前記磁歪棒を伸縮させて前記自由端側のフレームを振動させることを特徴とするアクチュエータ。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL UNIVERSITY CORPORATION KANAZAWA UNIVERSITY
  • Inventor
  • UENO Toshiyuki
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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