JPS63253180A - Shape memory alloy actuator - Google Patents
Shape memory alloy actuatorInfo
- Publication number
- JPS63253180A JPS63253180A JP8579087A JP8579087A JPS63253180A JP S63253180 A JPS63253180 A JP S63253180A JP 8579087 A JP8579087 A JP 8579087A JP 8579087 A JP8579087 A JP 8579087A JP S63253180 A JPS63253180 A JP S63253180A
- Authority
- JP
- Japan
- Prior art keywords
- shape memory
- memory alloy
- output shaft
- actuator
- magnetic fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 45
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 17
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 230000004044 response Effects 0.000 abstract 2
- 230000004043 responsiveness Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は形状記憶合金を用いたアクチュエータに関し、
特に、形状記憶合金の冷却促進手段に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an actuator using a shape memory alloy,
In particular, the present invention relates to means for promoting cooling of shape memory alloys.
従来の形状記憶合金を用いたアクチュエータとしては、
例えば第２図の装置がある。このアクチュエータは、ガ
イド２４の両端面の貫通部２４ａ。As an actuator using conventional shape memory alloy,
For example, there is a device shown in FIG. This actuator has penetration parts 24a on both end faces of the guide 24.
２４ｂに軸支され、中央の７ランジ３ａの左側に形状記
憶合金コイル１が設けられ、右側に圧縮ばね２２が設け
られた出力軸３を備えている。形状記憶合金コイル１の
両端は、電源６とスイッチ７を備えた電気回路５に接続
されている。形状記憶合金コイル１は冷却されたときに
縮んだ状態にあり。24b, the shape memory alloy coil 1 is provided on the left side of the central seven langes 3a, and the output shaft 3 is provided with the compression spring 22 on the right side. Both ends of the shape memory alloy coil 1 are connected to an electric circuit 5 comprising a power source 6 and a switch 7. The shape memory alloy coil 1 is in a contracted state when cooled.
圧縮ばね２２の押圧力により出力軸３は左側に押されて
いるが、スイッチ７をオンすると形状記憶合金コイルｌ
に１ｒＬＩＩ１．が流れて温度が上昇し、記憶された形
状、すなわち伸張する方向へ移動し、圧縮ばね２２め押
圧力に打勝って出力軸３を右側に移動させる。スイッチ
７をオフにすると電流は流れなくなり、形状記憶合金コ
イルｌは徐々に冷却して出力軸３は圧縮ばね２２に押さ
れて再び最初の位置に戻る。The output shaft 3 is pushed to the left by the pressing force of the compression spring 22, but when the switch 7 is turned on, the shape memory alloy coil l
1rLII1. flows, the temperature rises, the output shaft 3 moves to the memorized shape, that is, the direction of expansion, overcomes the pressing force of the compression spring 22, and moves the output shaft 3 to the right. When the switch 7 is turned off, no current flows, the shape memory alloy coil l gradually cools down, and the output shaft 3 is pushed by the compression spring 22 and returns to its initial position.
上述した従来のアクチュエータは、出力軸３を右側に移
動させる場合、形状記憶合金コイルに流す電流の強さを
大きくしてやれば応答性がよくなる。しかし、出力軸を
右側から左側に動かす場合には、スイッチをオフにして
電流が流れないようにしても、形状記憶合金コイルの冷
却にはある程度の時間がかかるので出力軸はすぐには移
動しない、したがって、形状記憶合金コイルに流す電流
を大きくして出力軸を左側から右側へ動かすための応答
性をよくすればするほど、出力軸が右側から左側に戻る
に要する時間が相対的に長くなり、このアンバランスの
ためアクチュエータとして使用できないという欠点があ
る。In the conventional actuator described above, when moving the output shaft 3 to the right side, the responsiveness can be improved by increasing the strength of the current flowing through the shape memory alloy coil. However, when moving the output shaft from the right side to the left side, even if the switch is turned off and no current flows, the output shaft will not move immediately because the shape memory alloy coil takes some time to cool down. Therefore, the greater the current flowing through the shape memory alloy coil to improve the responsiveness for moving the output shaft from the left to the right, the longer the time required for the output shaft to return from the right to the left. , has the disadvantage that it cannot be used as an actuator due to this imbalance.
第３図は、上記欠点の改善を図ったものである。出力軸
３の中央フランジ３ａの右側に、左側の形状記憶合金コ
イルｌが冷却し収縮しているときにスイッチ７がオンし
て電源９より電流が流れ、高温になって伸長し、出力軸
３を右側から左側に移動させる形状記憶合金コイル２を
備えている。このアクチュエータでは、左側の形状記憶
合金コイル１と、右側の形状記憶合金コイル２とが互い
に反対の動作をするので、第２図の７クチユエータに比
べである程度出力軸の移動を制御することが可能となる
が、形状記憶合金コイル１．２の冷却を促進する手段が
なく、アクチュエータとしての応答性が悪いという欠点
は根本的には改善されない。FIG. 3 shows an attempt to improve the above-mentioned drawbacks. When the left shape memory alloy coil l is cooling and contracting, the switch 7 is turned on and current flows from the power supply 9 to the right side of the central flange 3a of the output shaft 3, and the coil becomes hot and expands. It is equipped with a shape memory alloy coil 2 that moves from the right side to the left side. In this actuator, the shape memory alloy coil 1 on the left side and the shape memory alloy coil 2 on the right side operate in opposite directions, so it is possible to control the movement of the output shaft to a certain extent compared to the 7 actuator shown in Fig. 2. However, there is no means to promote cooling of the shape memory alloy coil 1.2, and the drawback of poor responsiveness as an actuator cannot be fundamentally improved.
本発明は、上述した形状記憶合金アクチュエータの欠点
である応答性の悪さを改善することを目的とする。The present invention aims to improve the poor responsiveness that is a drawback of the shape memory alloy actuator described above.
本発明の形状記憶合金アクチュエータは、筐体内部に磁
性流体を充満させたことを特徴とし、また筐体の出力軸
貫通部の近傍に磁性流体の漏洩を防上するための永久磁
石を備えている。The shape memory alloy actuator of the present invention is characterized in that the inside of the housing is filled with magnetic fluid, and the housing is equipped with a permanent magnet near the output shaft penetrating portion to prevent leakage of the magnetic fluid. There is.
したがって、左側の形状記憶合金コイルの電気回路のス
イッチをオンさせ、右側の電気回路のスイッチをオフに
すると、左側の形状記憶合金コイルが伸張すると同時に
、右側の形状記憶合金コイルは磁性流体により冷却され
て収縮し、出力軸は迅速に左側から右側に移動する。磁
性流体の熱伝導率は空気の約１０倍程度であるので形状
記憶合金コイルの収縮は迅速に行なわれる。出力軸を右
側から左側へ移動させることは、この逆の操作によって
なされる。また、筐体内部の磁性流体の漏洩は、筐体の
出力軸貫通部の近傍に設けられた永久磁石により防止さ
れる。Therefore, when the electric circuit of the left shape memory alloy coil is switched on and the right electric circuit is switched off, the left shape memory alloy coil expands while the right shape memory alloy coil is cooled by the magnetic fluid. and the output shaft quickly moves from left to right. Since the thermal conductivity of the magnetic fluid is about 10 times that of air, the shape memory alloy coil contracts quickly. Moving the output shaft from the right side to the left side is accomplished by reversing this operation. Furthermore, leakage of the magnetic fluid inside the housing is prevented by a permanent magnet provided near the output shaft penetrating portion of the housing.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の形状記憶合金アクチュエータの一実施
例の断面図である。FIG. 1 is a sectional view of one embodiment of the shape memory alloy actuator of the present invention.
本実施例では、第３図の従来例のガイド２４に代えて、
出力軸３を内部に収容する筐体４を有し、筐体４は軟磁
性材で筐体４の両側の出力軸貫通部の外側にそれぞれ永
久磁石１１．１３を設け、さらにその外側に軟磁性材の
ヨーク１２，１４ 、が取付けられている。また、筐体
４の内部は磁性流体１５により充満されている。？ａ性
流体１５の一部はそれぞれ出力軸３と筐体４およびヨー
ク１２．１４の隙間に浸入して、磁性流体の薄膜１８．
１７を形成している。形状記憶合金ｌおよび２の両端に
接続された電気回路５および８は筐体４の上部に設けら
れた引出し穴１８から導線によって引出される。引出し
穴１８は内部の磁性流体１５が流出しないよう、接着剤
による穴塞ぎ１９により塞がれている。In this embodiment, instead of the guide 24 of the conventional example shown in FIG.
The housing 4 has a housing 4 that houses the output shaft 3 therein, and the housing 4 is made of a soft magnetic material, and permanent magnets 11 and 13 are provided on the outside of the output shaft penetration portion on both sides of the housing 4, and a soft magnetic material is provided on the outside of the housing 4. Yokes 12 and 14 made of magnetic material are attached. Further, the inside of the casing 4 is filled with magnetic fluid 15 . ? A portion of the magnetic fluid 15 penetrates into the gaps between the output shaft 3, the housing 4, and the yoke 12, 14, respectively, and forms a thin film of magnetic fluid 18.
17 is formed. Electric circuits 5 and 8 connected to both ends of the shape memory alloys 1 and 2 are led out from a lead-out hole 18 provided in the upper part of the casing 4 by conductive wires. The extraction hole 18 is closed with an adhesive hole plug 19 to prevent the magnetic fluid 15 inside from flowing out.
いま、スイッチ７がオフの状態、すなわち形状記憶合金
コイルｌが収縮し、出力軸３が左側に押された状態でス
イッチ７がオンされスイッチ１０がオフになると、電源
６から電流が流れて形状記憶合金コイル１は高温になり
、これと同時に形状記憶合金コイル２には電流が流れな
くなる。また、形状記憶合金コイル２は磁性粒体１５に
より冷却されて急徴に収縮するので、出力軸３のフラン
ジ３ａは形状記憶合金コイルｌの伸張する力で強く押さ
れ出力軸３は左側から右側に移動する。電流が流れ続け
ている間、形状記憶合金コイル１は高温に保たれ、出力
軸３の端部が右側に突出した状態で保持される。次に、
スイ・ンチｌＯがオンされスイッチ７がオフになると、
出力軸３は上記と全く反対の動作をとて右側から左側に
移動し、出力軸３の端部が左側に突出した状態となる。Now, when the switch 7 is turned off, that is, the shape memory alloy coil l is contracted and the output shaft 3 is pushed to the left, when the switch 7 is turned on and the switch 10 is turned off, a current flows from the power source 6 and the shape is changed. The memory alloy coil 1 becomes high in temperature, and at the same time, current no longer flows through the shape memory alloy coil 2. In addition, since the shape memory alloy coil 2 is cooled by the magnetic particles 15 and rapidly contracts, the flange 3a of the output shaft 3 is strongly pressed by the force of the shape memory alloy coil 1 expanding, and the output shaft 3 is moved from the left side to the right side. Move to. While the current continues to flow, the shape memory alloy coil 1 is kept at a high temperature, and the end of the output shaft 3 is kept protruding to the right. next,
When switch lO is turned on and switch 7 is turned off,
The output shaft 3 moves from the right side to the left side by performing an operation completely opposite to the above, and the end of the output shaft 3 is in a state of protruding to the left side.
筐体４の内部の磁性流体１５は永久磁石１１．１３によ
り笛体４およびヨーク１２．１４と出力軸３との間で磁
性粒体の薄膜１ｆ３，１７となり、外部に漏洩しないよ
うにシールされる。The magnetic fluid 15 inside the housing 4 becomes a thin film of magnetic particles 1f3, 17 between the flute body 4 and the yoke 12.14 and the output shaft 3 by the permanent magnet 11.13, and is sealed to prevent leakage to the outside. Ru.
以北説明したように本発明は、一対の形状記憶合金コイ
ルを備えた出力軸を筒体内部に納め、形状記憶合金コイ
ルのまわりに磁性流体を充満させ１位体の出力軸貫通部
の近傍に永久磁石を配設してシールすることによりアク
チュエータの出力軸の移動が迅速になり、応答性がよく
、かつ、小型で低コストの形状記憶合金アクチュエータ
が得られる効果がある。As explained above, the present invention stores an output shaft equipped with a pair of shape memory alloy coils inside a cylindrical body, and fills the area around the shape memory alloy coils with a magnetic fluid to generate magnetic fluid in the vicinity of the output shaft penetrating portion of the body. By arranging a permanent magnet and sealing it, the output shaft of the actuator can be moved quickly, and there is an effect that a shape memory alloy actuator with good responsiveness, small size, and low cost can be obtained.
第１図は本発明の形状記憶合金アクチュエータの一実施
例の断面図、第２図、第３図は、それぞれ従来の形状記
憶合金アクチュエータの断面図である。
１．２・・・・・・形状記憶合金コイル、３・・・・・
・・・・出力軸、 ３ａ・・・・・・中央フランジ
４・・・・・・・・・笛体、 ５，８・・・・・
・電気回路、６．９・・・・・・電源、 ７．
１０・・・・・・スイッチ、１１．１３・・・永久磁石
、 １２．１４・・・ヨーク。
１、テ許出願人 干ヤノン株式会社
代 理 人 若 林 忠第１図
第２図
第３図FIG. 1 is a sectional view of one embodiment of the shape memory alloy actuator of the present invention, and FIGS. 2 and 3 are sectional views of conventional shape memory alloy actuators, respectively. 1.2...Shape memory alloy coil, 3...
...Output shaft, 3a...Central flange 4...Flute body, 5,8...
・Electrical circuit, 6.9...Power supply, 7.
10...Switch, 11.13...Permanent magnet, 12.14...Yoke. 1. Applicant: Hoshi Yanon Co., Ltd. Agent: Tadashi Wakabayashi Figure 1 Figure 2 Figure 3
Claims (2)
金により前記筐体を貫通する出力軸を作動する形状記憶
合金アクチュエータにおいて、 前記筐体内部に磁性流体を充満させたことを特徴とする
形状記憶合金アクチュエータ。1. A shape memory alloy actuator that houses a shape memory alloy in a housing and operates an output shaft passing through the housing using the shape memory alloy, characterized in that the inside of the housing is filled with magnetic fluid. Alloy actuator.
を防止するための永久磁石を備えた特許請求の範囲第１
項記載の形状記憶合金アクチュエータ。2. Claim 1: A permanent magnet for preventing leakage of magnetic fluid is provided near the output shaft penetrating portion of the housing.
Shape memory alloy actuator as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8579087A JPS63253180A (en) | 1987-04-09 | 1987-04-09 | Shape memory alloy actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8579087A JPS63253180A (en) | 1987-04-09 | 1987-04-09 | Shape memory alloy actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63253180A true JPS63253180A (en) | 1988-10-20 |
Family
ID=13868683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8579087A Pending JPS63253180A (en) | 1987-04-09 | 1987-04-09 | Shape memory alloy actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63253180A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008096348A (en) * | 2006-10-13 | 2008-04-24 | Tlv Co Ltd | Vibrometer |
| JP2008170387A (en) * | 2007-01-15 | 2008-07-24 | Tlv Co Ltd | Vibrometer |
| FR2991399A1 (en) * | 2012-06-04 | 2013-12-06 | Centre Nat Etd Spatiales | SHAPE ACTUATOR WITH SHAPE MEMORY |
-
1987
- 1987-04-09 JP JP8579087A patent/JPS63253180A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008096348A (en) * | 2006-10-13 | 2008-04-24 | Tlv Co Ltd | Vibrometer |
| JP2008170387A (en) * | 2007-01-15 | 2008-07-24 | Tlv Co Ltd | Vibrometer |
| FR2991399A1 (en) * | 2012-06-04 | 2013-12-06 | Centre Nat Etd Spatiales | SHAPE ACTUATOR WITH SHAPE MEMORY |
| WO2013182791A1 (en) * | 2012-06-04 | 2013-12-12 | Centre National D'Études Spatiales C N E S | Winding actuator made of shape memory material |
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