JP2015146708A - vibration power generator - Google Patents
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- JP2015146708A JP2015146708A JP2014019248A JP2014019248A JP2015146708A JP 2015146708 A JP2015146708 A JP 2015146708A JP 2014019248 A JP2014019248 A JP 2014019248A JP 2014019248 A JP2014019248 A JP 2014019248A JP 2015146708 A JP2015146708 A JP 2015146708A
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Abstract
Description
本発明は、磁歪素子を用いた振動発電装置に関する。 The present invention relates to a vibration power generation apparatus using a magnetostrictive element.
この種の振動発電装置として、特許文献１には、磁性材料で構成されたヨークと、磁歪材料で構成された磁歪棒（磁歪素子）と、この磁歪棒に巻回されたコイルとを有し、前記ヨークの曲げ振動によって前記磁歪棒が伸縮して発電する発電装置が開示されている。 As this type of vibration power generator, Patent Document 1 includes a yoke made of a magnetic material, a magnetostrictive rod (magnetostrictive element) made of a magnetostrictive material, and a coil wound around the magnetostrictive rod. A power generation device is disclosed in which the magnetostrictive rod expands and contracts by bending vibration of the yoke to generate power.
しかし、特許文献１に記載の発電装置では、前記ヨークの曲げ振動によって前記磁歪棒には圧縮力と引張力とが交互に作用する。このため、例えば、優れた磁歪特性を有する（発電効率が高い）ものの、引張変形に弱い超磁歪材料（例えば、ターフェノールＤ）を用いて前記磁歪棒を構成することができないという課題があった。 However, in the power generation device described in Patent Document 1, a compressive force and a tensile force act alternately on the magnetostrictive rod due to the bending vibration of the yoke. For this reason, for example, although it has excellent magnetostriction characteristics (high power generation efficiency), there is a problem that the magnetostrictive rod cannot be formed using a giant magnetostrictive material (for example, terphenol D) that is weak against tensile deformation. .
そこで、本発明は、引張変形に弱い超磁歪素子を用いることを可能とし、これにより、発電効率を高めることのできる振動発電装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a vibration power generation apparatus that can use a giant magnetostrictive element that is weak against tensile deformation and thereby can increase power generation efficiency.
本発明の一側面による振動発電装置は、コイルが巻回された磁歪素子と、当該磁歪素子を通る磁気回路を形成するヨークとを含み、前記ヨークの曲げ振動が前記磁歪素子に伝達されて発電するものであって、前記磁歪素子は、前記ヨークの曲げ振動によって圧縮力を受ける一方、引張力を受けないように保持されて構成されている。 A vibration power generation apparatus according to one aspect of the present invention includes a magnetostrictive element wound with a coil and a yoke forming a magnetic circuit passing through the magnetostrictive element, and bending vibration of the yoke is transmitted to the magnetostrictive element to generate power. The magnetostrictive element is configured to be held so as not to receive a tensile force while receiving a compressive force due to a bending vibration of the yoke.
前記振動発電装置によれば、前記ヨークの曲げ振動によって、前記磁歪素子には引張力が作用せず、圧縮力のみが作用する。このため、例えば、前記磁歪素子を、優れた磁歪特性を有するものの引張変形には弱い超磁歪材料を用いて形成することが可能となり、従来に比べて、発電効率を高めることができる。 According to the vibration power generator, a tensile force does not act on the magnetostrictive element and only a compressive force acts on the magnetostrictive element due to the bending vibration of the yoke. For this reason, for example, the magnetostrictive element can be formed using a giant magnetostrictive material that has excellent magnetostrictive characteristics but is weak against tensile deformation, and power generation efficiency can be improved as compared with the conventional case.
以下、添付図面を参照しつつ本発明の実施形態を説明する。
図１は、本発明の一実施形態による振動発電装置１の概略構成を示している。
図１に示すように、振動発電装置１は、磁性を有するヨーク２と、一対の保持部材３ａ，３ｂと、永久磁石４ａ，４ｂと、磁歪素子５と、磁歪素子５に巻回されたコイル６と、を含む。そして、振動発電装置１は、ヨーク２の曲げ振動が磁歪素子５に伝達されることによって発電する。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a schematic configuration of a vibration power generator 1 according to an embodiment of the present invention.
As shown in FIG. 1, the vibration power generator 1 includes a magnetic yoke 2, a pair of holding members 3 a and 3 b, permanent magnets 4 a and 4 b, a magnetostrictive element 5, and a coil wound around the magnetostrictive element 5. 6 are included. The vibration power generator 1 generates power by transmitting the bending vibration of the yoke 2 to the magnetostrictive element 5.
ヨーク２は、永久磁石４ａ，４ｂと協働して磁歪素子５を通る磁気回路を形成するものであり、その一端が振動源（図示省略）によって加振される振動部５０に固定されると共に振動部５０から離れる方向に延伸するように形成されている。本実施形態において、ヨーク２の他端は自由端となっており、ヨーク２はいわゆる片持ち梁を構成している。 The yoke 2 forms a magnetic circuit that passes through the magnetostrictive element 5 in cooperation with the permanent magnets 4a and 4b, and one end of the yoke 2 is fixed to a vibrating portion 50 that is vibrated by a vibration source (not shown). It is formed to extend in a direction away from the vibration part 50. In the present embodiment, the other end of the yoke 2 is a free end, and the yoke 2 forms a so-called cantilever.
ヨーク２には、その延伸方向における中間位置（ここでは、ヨーク２の延伸方向における中央部よりも振動部５０側に寄った位置）に凹部７が形成されている。本実施形態において、凹部７は、ヨーク２の下側面に形成されており、ヨーク２の延伸方向において所定の間隔Ｓをあけて対向する一対の壁部８ａ，８ｂを有している。すなわち、一対の壁部８ａ，８ｂは、凹部７の対向する二つの内側面である。 A concave portion 7 is formed in the yoke 2 at an intermediate position in the extending direction (here, a position closer to the vibrating portion 50 side than a central portion in the extending direction of the yoke 2). In the present embodiment, the recess 7 is formed on the lower surface of the yoke 2 and has a pair of wall portions 8 a and 8 b that are opposed to each other with a predetermined interval S in the extending direction of the yoke 2. That is, the pair of wall portions 8 a and 8 b are two inner side surfaces of the concave portion 7 facing each other.
ヨーク２は、振動部５０の振動によって共振するように形成されており、振動部５０が振動することによって、図１において矢印Ａに示すように、ヨーク２には上下方向の曲げ振動が発生する。なお、ヨーク２の断面形状は、特に制限されないが、本実施形態におけるヨーク２は、矩形断面を有している。 The yoke 2 is formed so as to resonate due to the vibration of the vibration part 50. When the vibration part 50 vibrates, as shown by an arrow A in FIG. . Note that the sectional shape of the yoke 2 is not particularly limited, but the yoke 2 in the present embodiment has a rectangular section.
ここで、ヨーク２の一端が固定される振動部５０は、何らかの振動源によって加振される部分、すなわち、振動が入力される部分であればよく、特に制限されないが、例えば列車の走行するレールの側面とすることができる。また、本実施形態では、ヨーク２の下側面に凹部７が形成されているが、凹部７はヨーク２の上側面に形成されてもよい。すなわち、凹部７は、振動部５０の振動によるヨーク２の曲げ振動の方向に応じて、ヨーク２の適切な位置に形成することができる。 Here, the vibration part 50 to which one end of the yoke 2 is fixed may be a part that is vibrated by some vibration source, that is, a part to which vibration is input, and is not particularly limited. The side can be. Further, in the present embodiment, the recess 7 is formed on the lower surface of the yoke 2, but the recess 7 may be formed on the upper surface of the yoke 2. That is, the concave portion 7 can be formed at an appropriate position of the yoke 2 according to the direction of the bending vibration of the yoke 2 due to the vibration of the vibration portion 50.
一対の保持部材３ａ，３ｂは、それぞれ一対の壁部８ａ、８ｂに取り付けられて、一対の壁部８ａ、８ｂの間に永久磁石４ａ，４ｂ及び磁歪素子５を保持する。具体的には、一対の保持部材３ａ，３ｂは、磁歪素子５の両端に永久磁石４ａ，４ｂを配置した状態で、これらを一対の壁部８ａ，８ｂの間に保持する。各保持部材３ａ，３ｂは、樹脂などの非磁性材料で形成されており、図２の要部拡大図に示すように、円筒部３１と、円筒部３１の一端に形成されたフランジ部３２とを有している。そして、各保持部材３ａ，３ｂは、その円筒部３１に永久磁石４ａ又は４ｂと、磁歪素子５の端部及びその近傍とを収容（内包）した状態で、そのフランジ部３２が、例えば接着剤によって一対の壁部８ａ，８ｂに取り付け固定されている。一対の保持部材３ａ，３ｂによって保持された磁歪素子５は、その一方の端面が保持部材３ａ内で永久磁石４ａに当接しており、その他方の端面が保持部材３ｂ内で永久磁石４ｂに当接している。 The pair of holding members 3a and 3b are attached to the pair of wall portions 8a and 8b, respectively, and hold the permanent magnets 4a and 4b and the magnetostrictive element 5 between the pair of wall portions 8a and 8b. Specifically, the pair of holding members 3a and 3b hold the permanent magnets 4a and 4b at both ends of the magnetostrictive element 5 between the pair of wall portions 8a and 8b. Each holding member 3a, 3b is formed of a non-magnetic material such as resin, and as shown in the enlarged view of the main part of FIG. 2, a cylindrical part 31 and a flange part 32 formed at one end of the cylindrical part 31 have. And each holding member 3a, 3b has the flange part 32 in the state which accommodated the permanent magnet 4a or 4b, the edge part of the magnetostrictive element 5, and its vicinity in the cylindrical part 31, for example, adhesives. Are attached and fixed to the pair of wall portions 8a and 8b. One end face of the magnetostrictive element 5 held by the pair of holding members 3a and 3b is in contact with the permanent magnet 4a in the holding member 3a, and the other end face is in contact with the permanent magnet 4b in the holding member 3b. It touches.
ここで、各保持部材３ａ，３ｂは、永久磁石４ａ，４ｂと、磁歪素子５の端部及びその近傍を円筒部３１内に緩く（すなわち、遊びを有して）収容（内包）しており、永久磁石３ａ及び磁歪素子５は、保持部材３ａに対して相対移動が可能であり、永久磁石３ｂ及び磁歪素子５は、保持部材３ｂに対して相対移動が可能になっている。 Here, each holding member 3a, 3b accommodates (encloses) the permanent magnets 4a, 4b and the end portions of the magnetostrictive element 5 and the vicinity thereof loosely (that is, with play) in the cylindrical portion 31. The permanent magnet 3a and the magnetostrictive element 5 can move relative to the holding member 3a, and the permanent magnet 3b and the magnetostrictive element 5 can move relative to the holding member 3b.
磁歪素子５は、磁歪材料で棒状（又は板状）に形成されている。磁歪素子５は、両端に永久磁石４ａ，４ｂが配置された状態で、一対の壁部８ａ，８ｂの間隔Ｓとほぼ同じ長さ又はそれよりも僅かに小さい長さを有するように形成されている。なお、磁歪素子５の断面形状は、特に制限されないが、本実施形態における磁歪素子５は、円形断面を有している。 The magnetostrictive element 5 is formed of a magnetostrictive material in a rod shape (or plate shape). The magnetostrictive element 5 is formed to have substantially the same length as or slightly smaller than the distance S between the pair of wall portions 8a and 8b in a state where the permanent magnets 4a and 4b are arranged at both ends. Yes. The cross-sectional shape of the magnetostrictive element 5 is not particularly limited, but the magnetostrictive element 5 in the present embodiment has a circular cross section.
コイル６は、例えば銅線で形成され、磁歪素子５の周囲に所定の間隔をあけて巻回されている。本実施形態において、コイル６の両端部は、それぞれ保持部材３ａ，３ｂの円筒部３１の外周面に巻きつけられて固定されており、これにより、コイル６は、磁歪素子５に接触しない状態で保持されるようになっている。すなわち、一対の保持部材３ａ，３ｂは、磁歪素子５の周囲に所定の間隔をあけた状態でコイル６を保持するコイル保持機能をも有している。 The coil 6 is formed of, for example, a copper wire, and is wound around the magnetostrictive element 5 with a predetermined interval. In the present embodiment, both end portions of the coil 6 are respectively wound and fixed around the outer peripheral surface of the cylindrical portion 31 of the holding members 3 a and 3 b, so that the coil 6 is not in contact with the magnetostrictive element 5. It is supposed to be retained. That is, the pair of holding members 3 a and 3 b also have a coil holding function for holding the coil 6 with a predetermined interval around the magnetostrictive element 5.
次に、以上のような構成を有する振動発電装置１の作用を説明する。
振動部５０が振動するとヨーク２には上下方向の曲げ振動（図１の矢印Ａ参照）が発生し、これによって、一対の壁部８ａ，８ｂの間隔Ｓが変動する。すなわち、一対の壁部８ａ，８ｂは、ヨーク２の曲り方向に応じて互いに接近又は離反する。そして、ヨーク２が曲げ振動している間、一対の壁部８ａ，８ｂは接近と離反とを繰り返すことになる。
Next, the operation of the vibration power generator 1 having the above configuration will be described.
When the vibration part 50 vibrates, a vertical bending vibration (see arrow A in FIG. 1) is generated in the yoke 2, whereby the distance S between the pair of wall parts 8 a and 8 b varies. That is, the pair of wall portions 8 a and 8 b approach or separate from each other according to the bending direction of the yoke 2. And while the yoke 2 is bending-vibrating, a pair of wall part 8a, 8b repeats approach and separation.
ここで、磁歪素子５は、保持部材３ａ，３ｂによって一対の壁部８ａ，８ｂの間に保持されているものの、磁歪素子５の両端及びその近傍は、保持部材３ａ、３ｂの円筒部３１内で相対移動が可能なように円筒部３１内に緩く収容（内包）されている。このため、一対の壁部８ａ，８ｂが互いに接近することによって磁歪素子５には圧縮力が作用することになるが、一対の壁部８ａ，８ｂが互いに離反しても、一対の壁部８ａ，８ｂに取り付けられた一対の保持部材３ａ，３ｂが互いに離れる方向に移動するだけで、磁歪素子５には引張力が作用しない。つまり、磁歪素子５は、ヨーク２の曲げ振動によって圧縮力を受けるが、引張力を受けない。したがって、磁歪素子５には、振動部５０の振動により発生するヨーク２の曲げ振動によって、圧縮変形のみが繰り返して生じることとなる。そして、この圧縮変形によって、磁歪素子５には逆磁歪効果が生じて磁歪素子５と平行な方向の磁束密度が変化し、これにより、コイル６に電流が発生する（すなわち、発電する）。 Here, although the magnetostrictive element 5 is held between the pair of wall portions 8a and 8b by the holding members 3a and 3b, both ends of the magnetostrictive element 5 and the vicinity thereof are inside the cylindrical portion 31 of the holding members 3a and 3b. The cylinder part 31 is loosely accommodated (encapsulated) so that relative movement is possible. For this reason, when the pair of wall portions 8a and 8b approach each other, a compressive force acts on the magnetostrictive element 5. However, even if the pair of wall portions 8a and 8b are separated from each other, the pair of wall portions 8a. , 8b only moves in a direction in which the pair of holding members 3a, 3b are separated from each other, and no tensile force acts on the magnetostrictive element 5. That is, the magnetostrictive element 5 receives a compressive force due to the bending vibration of the yoke 2 but does not receive a tensile force. Therefore, in the magnetostrictive element 5, only the compressive deformation is repeatedly generated due to the bending vibration of the yoke 2 generated by the vibration of the vibration part 50. The compressive deformation causes an inverse magnetostrictive effect in the magnetostrictive element 5 and changes the magnetic flux density in the direction parallel to the magnetostrictive element 5, thereby generating a current in the coil 6 (that is, generating electric power).
このように、本実施形態による振動発電装置１において、磁歪素子５は、ヨーク２の曲げ振動によって圧縮力を受ける一方、引張力を受けないように保持されている。具体的には、磁歪素子５は、一対の保持部材３ａ，３ｂによって、一対の壁部８ａ，８ｂの間に、ヨーク２の曲げ振動によって接近した一対の壁部８ａ，８ｂによって圧縮される一方、離反した一対の壁部８ａ，８ｂによっては引っ張られないように保持されている。そして、振動発電装置１は、磁歪素子５がヨーク２の曲げ振動によって互いに接近した一対の壁部８ａ，８ｂによって圧縮されて発電する。 Thus, in the vibration power generator 1 according to the present embodiment, the magnetostrictive element 5 is held so as not to receive a tensile force while receiving a compressive force due to the bending vibration of the yoke 2. Specifically, the magnetostrictive element 5 is compressed by the pair of holding members 3a and 3b by the pair of wall portions 8a and 8b that are close to each other by the bending vibration of the yoke 2 between the pair of wall portions 8a and 8b. The pair of separated wall portions 8a and 8b are held so as not to be pulled. In the vibration power generator 1, the magnetostrictive element 5 is compressed by the pair of wall portions 8 a and 8 b that are close to each other by the bending vibration of the yoke 2, and generates power.
このため、引張変形には弱いが、優れた磁歪特性を有する（高い磁歪定数の）ターフェノールＤ（Ｔｅｌｆｅｎｏｌ−Ｄ）などの超磁歪材料で磁歪素子５を形成すること、すなわち、磁歪素子５として超磁歪素子を採用することが可能となり、従来に比べて、発電効率の高い振動発電装置１を実現できる。但し、前記超磁歪材料で形成した磁歪素子５に限るものではなく、ガルフェノール（Ｇａｌｆｅｎｏｌ）などの通常の磁歪材料で磁歪素子５を形成してもよいことはもちろんである。この場合、発電効率を高めることはできないものの、圧縮力と引張力とが繰り返して作用しないので、磁歪素子５の寿命等の面で有利である。 Therefore, the magnetostrictive element 5 is formed of a supermagnetostrictive material such as terphenol D (Telfenol-D) having excellent magnetostriction characteristics but having excellent magnetostriction characteristics, that is, as the magnetostrictive element 5. It is possible to employ a giant magnetostrictive element, and the vibration power generator 1 having higher power generation efficiency than that of the prior art can be realized. However, it is not limited to the magnetostrictive element 5 formed of the super magnetostrictive material, and the magnetostrictive element 5 may be formed of a normal magnetostrictive material such as Galphenol. In this case, although the power generation efficiency cannot be increased, the compressive force and the tensile force do not act repeatedly, which is advantageous in terms of the life of the magnetostrictive element 5 and the like.
また、保持部材３ａ，３ｂは、非磁性材料で形成されており、その円筒部３１の外周面に、コイル６の各端部が巻きつけ固定されている。これにより、磁歪素子５とコイル６との接触が防止されるので、磁歪素子５とコイル６とを樹脂などによって固定しなくて、振動発電装置１の発電特性等の変動を抑制できる。 The holding members 3 a and 3 b are made of a nonmagnetic material, and each end of the coil 6 is wound around and fixed to the outer peripheral surface of the cylindrical portion 31. As a result, contact between the magnetostrictive element 5 and the coil 6 is prevented, so that fluctuations in the power generation characteristics and the like of the vibration power generator 1 can be suppressed without fixing the magnetostrictive element 5 and the coil 6 with resin or the like.
以上、本発明の一実施形態について説明したが、本発明は上述の実施形態に限定されるものではなく、本発明の技術的思想に基づいて更なる変形や変更が可能である。以下にいくつか例示する。 As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, Based on the technical idea of this invention, a further deformation | transformation and change are possible. Some examples are given below.
例えば、上述の実施形態では、一対の壁部８ａ，８ｂの両方に保持部材３ａ，３ｂが取り付けられている。しかし、これに限るものではなく、例えば、保持部材における円筒部の長さを十分に確保することで、一対の壁部８ａ，８ｂの一方のみに保持部材を取り付けるようにすることもできる。この場合、保持部材に収容されない永久磁石は、例えば、磁歪素子５の端部又はヨーク２に形成された凹部７の壁部に接着剤などによって固定する。 For example, in the above-described embodiment, the holding members 3a and 3b are attached to both the pair of wall portions 8a and 8b. However, the present invention is not limited to this. For example, the holding member can be attached to only one of the pair of wall portions 8a and 8b by sufficiently securing the length of the cylindrical portion of the holding member. In this case, the permanent magnet that is not accommodated in the holding member is fixed to the end portion of the magnetostrictive element 5 or the wall portion of the concave portion 7 formed in the yoke 2 with an adhesive or the like.
また、ヨークを複数の部材によって構成してもよい。例えば、図３に示すように、所定の間隔をあけて設けられた二つのヨークブロック（第１ヨークブロック２１１，第２ヨークブロック２１２）と、この二つのヨークブロックを連結する連結部材２１３とでヨーク２１を構成する。連結部材２１３は、磁性及び弾性を有する材料で板状又は棒状に形成することができる。この場合には、例えば、第１ヨークブロック２１１の第２ヨークブロック２１２側の側面（内側面）とは反対側の側面（外側面）が振動部５０に固定され、第１ヨークブロック２１１の内側面及び第２ヨークブロック２１２の第１ヨークブロック２１１側の側面（内側面）が一対の壁部８ａ，８ｂとなる。 Further, the yoke may be constituted by a plurality of members. For example, as shown in FIG. 3, two yoke blocks (first yoke block 211 and second yoke block 212) provided at a predetermined interval and a connecting member 213 that connects the two yoke blocks. The yoke 21 is configured. The connecting member 213 can be formed in a plate shape or a rod shape using a material having magnetism and elasticity. In this case, for example, the side surface (outer side surface) opposite to the side surface (inner side surface) of the first yoke block 211 on the second yoke block 212 side is fixed to the vibrating portion 50, and the inner side of the first yoke block 211 is The side surface and the side surface (inner surface) of the second yoke block 212 on the first yoke block 211 side form a pair of wall portions 8a and 8b.
このようなヨーク２１を用いれば、特に連結部材２１３の作用によって、振動部５０の振動に伴うヨーク２１の曲げ振動を大きくすることができ、振動発電装置の発電効率をさらに向上できる。なお、図３においては、第１ヨークブロック２１１の上面と第２ヨークブロック２１２の上面とを板状の連結部材２１３によって連結しているが、これに限るものではなく、例えば、棒状の連結部材２１３によって二つのヨークブロック２１１，２１２の対向する側面（内側面）同士を連結するようにしてもよい。 If such a yoke 21 is used, the bending vibration of the yoke 21 accompanying the vibration of the vibration part 50 can be increased by the action of the connecting member 213, and the power generation efficiency of the vibration power generator can be further improved. In FIG. 3, the upper surface of the first yoke block 211 and the upper surface of the second yoke block 212 are connected by a plate-like connecting member 213, but the present invention is not limited to this, for example, a rod-like connecting member The opposing side surfaces (inner side surfaces) of the two yoke blocks 211 and 212 may be connected by 213.
また、磁歪素子５に圧縮与圧を付与可能な構成としてもよい。例えば、図４に示すように、上述の実施形態におけるヨーク２に対し、磁歪素子５の延長上となる位置にヨーク２の自由端から凹部７まで延びる（貫通する）ねじ孔（めねじ）１０を形成する。そして、このねじ孔１０に、外周面にねじ部（おねじ）が形成された与圧付与部材１１をねじ結合（螺合）して与圧付与部材１１を進退させることにより、永久磁石４ｂを介して磁歪素子５に圧縮与圧を調整可能に付与できるように構成する。このように、磁歪素子５に圧縮与圧を付与することにより、振動発電装置の発電効率をさらに向上させることができる。 The magnetostrictive element 5 may be configured to be able to apply a compressive pressure. For example, as shown in FIG. 4, with respect to the yoke 2 in the above-described embodiment, a screw hole (female screw) 10 extending (penetrating) from the free end of the yoke 2 to the recess 7 at a position on the extension of the magnetostrictive element 5. Form. Then, the permanent magnet 4b is moved by reciprocating the pressurizing member 11 by screwing (screwing) the pressurizing member 11 having a threaded portion (male thread) formed on the outer peripheral surface thereof. Thus, the compressive pressure can be applied to the magnetostrictive element 5 in an adjustable manner. Thus, by applying a compression pressure to the magnetostrictive element 5, the power generation efficiency of the vibration power generator can be further improved.
また、上述の実施形態では、磁歪素子５の両端に永久磁石４ａ，４ｂが配置されているが、これに限るものではない。ヨーク２と永久磁石４ａ，４ｂによって磁歪素子５を通る磁気回路が形成されればよく、永久磁石４ａ，４ｂの配置は適宜設定することができる。この場合、一対の保持部材３ａ，３ｂは、例えば、磁歪素子５の両端を一対の壁部８ａ，８ｂに当接させた状態で磁歪素子５を保持するように構成する。 In the above-described embodiment, the permanent magnets 4a and 4b are disposed at both ends of the magnetostrictive element 5, but the present invention is not limited to this. The yoke 2 and the permanent magnets 4a and 4b only need to form a magnetic circuit passing through the magnetostrictive element 5, and the arrangement of the permanent magnets 4a and 4b can be set as appropriate. In this case, the pair of holding members 3a and 3b are configured to hold the magnetostrictive element 5 in a state where both ends of the magnetostrictive element 5 are in contact with the pair of wall portions 8a and 8b, for example.
また、上述の実施形態では、ヨーク２とは別体で構成された一対の保持部材３ａ，３ｂによって永久磁石４ａ，４ｂ及び磁歪素子５が保持されている。しかし、これに限るものではなく、一対の保持部材３ａ，３ｂと同様の機能を有する部分をヨーク２に一体形成してもよい。この場合には、例えば、一方の保持部材３ａと同様の機能を有する部分を一方の壁部８ａに突出形成し、他方の保持部材３ｂと同様の機能を有する部分を他方の壁部８ｂに突出形成する。 Further, in the above-described embodiment, the permanent magnets 4a and 4b and the magnetostrictive element 5 are held by the pair of holding members 3a and 3b configured separately from the yoke 2. However, the present invention is not limited to this, and a portion having a function similar to that of the pair of holding members 3 a and 3 b may be integrally formed with the yoke 2. In this case, for example, a portion having the same function as that of the one holding member 3a is formed on one wall portion 8a, and a portion having the same function as that of the other holding member 3b is protruded on the other wall portion 8b. Form.
また、上述の実施形態では、ヨーク２の一端を振動部５０に固定し、他端を自由端としているが、振動部５０が振動することによってヨーク２に上下方向の曲げ振動が発生すればよく、上述の構成に限るものではない。例えば、ヨーク２の一端を振動部５０に固定することに代えて、ヨーク２の一端が振動部に支持（単純支持）されるように構成してもよい。さらに、ヨーク２の他端を、振動部で支持したり、非振動部で支持したり、振動部又は非振動部に固定したりすることもできる。
なお、以上の各変形例は、必要に応じて、組み合わせて適用することが可能である。
Further, in the above-described embodiment, one end of the yoke 2 is fixed to the vibrating portion 50 and the other end is a free end. However, it is only necessary that the bending vibration in the vertical direction is generated in the yoke 2 when the vibrating portion 50 vibrates. The configuration is not limited to that described above. For example, instead of fixing one end of the yoke 2 to the vibrating part 50, one end of the yoke 2 may be supported (simple supported) by the vibrating part. Furthermore, the other end of the yoke 2 can be supported by the vibration part, supported by the non-vibration part, or fixed to the vibration part or the non-vibration part.
Note that the above-described modifications can be applied in combination as necessary.
１…振動発電装置、２…ヨーク、３ａ，３ｂ…保持部材、４ａ，４ｂ…永久磁石、５…磁歪素子、６…コイル、７…凹部、８ａ，８ｂ…壁部、１１…与圧付与部材、５０…振動部 DESCRIPTION OF SYMBOLS 1 ... Vibration power generation device, 2 ... Yoke, 3a, 3b ... Holding member, 4a, 4b ... Permanent magnet, 5 ... Magnetostrictive element, 6 ... Coil, 7 ... Recessed part, 8a, 8b ... Wall part, 11 ... Pressurizing provision member , 50 ... vibration part
Claims (9)
前記磁歪素子は、前記ヨークの曲げ振動によって圧縮力を受ける一方、引張力を受けないように保持されて構成された、振動発電装置。 A vibration power generator including a magnetostrictive element wound with a coil and a yoke forming a magnetic circuit passing through the magnetostrictive element, wherein bending vibration of the yoke is transmitted to the magnetostrictive element to generate electric power,
The magnetostrictive element is a vibration power generator configured to be held so as not to receive a tensile force while receiving a compressive force due to bending vibration of the yoke.
前記磁歪素子を、互いに接近した前記一対の壁部によって圧縮される一方、互いに離反した前記一対の壁部によっては引っ張られないように、前記一対の壁部の間に保持する保持部を有し、
前記磁歪素子が、互いに接近した前記一対の壁部によって圧縮されて発電する、請求項１又は２に記載の振動発電装置。 The yoke is formed with a pair of walls that approach and separate from each other by bending vibration of the yoke,
A holding portion that holds the magnetostrictive element between the pair of wall portions so that the magnetostrictive element is compressed by the pair of wall portions that are close to each other but is not pulled by the pair of wall portions that are separated from each other; ,
The vibration power generation device according to claim 1, wherein the magnetostrictive element generates power by being compressed by the pair of wall portions that are close to each other.
前記一対の壁部は、前記ヨークの延伸方向の中間位置に当該延伸方向において対向するように形成されている、請求項３に記載の振動発電装置。 The yoke is fixed or supported at one end to a vibrating portion excited by a vibration source and extends in a direction away from the vibrating portion.
The vibration power generator according to claim 3, wherein the pair of wall portions are formed so as to face each other in the extending direction at an intermediate position in the extending direction of the yoke.
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| JP2020124017A (en) * | 2019-01-29 | 2020-08-13 | 住友金属鉱山株式会社 | Vibration power generation device |
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