JP3666669B2

JP3666669B2 - Temperature sensitive actuator

Info

Publication number: JP3666669B2
Application number: JP29793494A
Authority: JP
Inventors: 哲朗連
Original assignee: Mikuni Corp
Current assignee: Mikuni Corp
Priority date: 1994-11-07
Filing date: 1994-11-07
Publication date: 2005-06-29
Anticipated expiration: 2020-06-29
Also published as: JPH08136360A

Description

【０００１】
【産業上の利用分野】
本発明は、環境あるいは特定機器の温度変化を検知して駆動力を発生する感温アクチュエータに関する。
【０００２】
【従来の技術】
制御対象よっては、環境あるいは機器の温度変化に応じてその応動条件を変化させたい場合がある。例えば自動車に搭載するアイドリング・スピード・コントローラ（以下、ＩＳＣと称す）がある。この場合、自動車のアイドリング状態にあっては、その吸入空気量はエンジン温度によって影響を受ける。
【０００３】
したがって必要とする位置に温度検知素子を取り付け、各温度検知素子からの検出信号を集めて制御条件を得るようにしている。即ち、エンジン温度が高ければバイパス空気量を小さくし、逆にエンジン温度が低ければバイパス空気量を大きくしている。
【０００４】
要するに、ＩＳＣ用の弁体は低温時に大きなストロークを要求され、高温時には暴走対策として閉弁位置の近くで、小さなストロークしか移動しない仕様が要求される。図１５はＩＳＣの弁体制御用のロータリアクチュエータの要求特性であり、横軸に温度Ｔ［℃］を、又、縦軸にストローク［ｄｅｇ］をとって示したものである。
【０００５】
【発明が解決しようとする課題】
上記した制御を行なおうとすれば、測定を必要とする位置毎に対応して複数の温度検知素子を必要とし、かつ温度条件を加味した制御回路としなければならず、構造的な複雑さに加えて信頼性及びコストアップの問題がある。
本発明は上記事情に鑑みてなされたものであり、簡単な構成で温度に応じて前記ストローク特性の得られる感温アクチュエータを提供することを目的としている。
【０００６】
【課題を解決するための手段】
本発明の請求項１に係る感温アクチュエータは、磁性材を用いて閉磁路を形成した固定子と、前記固定子の閉磁路内の開口にあって回転自在に設けられた永久磁石よりなる回転子と、前記固定子と回転子とを磁気的に連結するために、前記固定子と接続して互いに前記閉磁路内の中心位置に向って突出して設けられた複数の磁極片５，６，７，８と、前記磁極片の内の少なくとも一対の対峙する磁極片は各回転子側対向面に夫々感温磁性材９，10を設けた。
【０００７】
本発明の請求項２に係る感温アクチュエータは、請求項１において、固定子の磁路を切欠いて間隙11を設けると共に、前記磁路内には起磁力源12を設けた。
【０００８】
本発明の請求項３に係る感温アクチュエータは、磁性材を用いて形成した閉磁路を２ａ，２ｂ，２ｃに３分割した固定子と、前記固定子の閉磁路内の開口にあって回転自在に設けられた永久磁石よりなる回転子と、前記分割された固定子と回転子とを磁気的に連結するために、前記固定子に接続して設けられた複数の磁極片５，６，７，８と、前記分割した夫々の固定子２ａ，２ｂ間の磁路内に感温磁性材13を設けると共に、前記磁路内の夫々の固定子２ｂと２ｃ間の磁路内にエアーギャップ14を設けた。
【０００９】
本発明の請求項４に係る感温アクチュエータは、請求項３において、磁路内には起磁力源12を設けた。
【００１０】
本発明の請求項５に係る感温アクチュエータは、磁性材を用いて形成した閉磁路を２ａ，２ｂ，２ｃに３分割した固定子と、前記固定子の閉磁路内の開口にあって回転自在に設けられた永久磁石よりなる回転子と、前記分割された固定子と回転子とを磁気的に連結するために、前記固定子に接続して夫々前記閉磁路内の中心に向けて設けられた複数の磁極片５，６，７，８と、前記分割された固定子２ａ，２ｂ間にあって互いに閉磁路内の中心に向い所定距離をおいて突出する２つの磁極片７と８との間の位置に感温磁性材15を設けると共に、分割された夫々の固定子２ｂと２ｃとの間にエアーギャップ14を設けた。
【００１１】
本発明の請求項６に係る感温アクチュエータは、請求項５において、固定子２ａと２ｂとの間の磁路内には起磁力源12を設けた。
【００１２】
本発明の請求項７に係る感温アクチュエータは、磁性材を用いて形成した閉磁路をその中心線を境にして左右に２ａ，２ｂとして２分割した固定子と、前記固定子と一体になった複数の磁極片が突出して形成された開口内にあって回転自在に設けられた永久磁石よりなる回転子と、前記固定子と回転子とを磁気的に連結するために、前記２分割された各固定子に接続して夫々前記開口内の回転子位置に向けて設けられた複数の磁極片５−１，６−１，７−１，８−１と、前記２分割した中心線が各固定子２ａ，２ｂと接する一方の位置には、閉磁路を切欠いて設けた間隙と、前記中心線が各固定子２ａ，２ｂと接する他方の位置には固定磁路を切欠いて設けた間隙に感温磁性材15を介在させることにより閉磁路を形成し、前記各磁極片５−１，７−１は互いに対峙して設けた一方の１対とすると共に、前記各磁極片６−１，８−１は互いに対峙して設けた他方の１対とし、前記一方の１対と前記他方の一対との回転子への各対向面の面積を異ならせた。
【００１３】
本発明の請求項８に係る感温アクチュエータは、磁性材を用いて形成した閉磁路に感温磁性材15を介在させた固定子と、前記固定子に設けた電磁コイル12と、前記固定子内の左右に偏倚して設けた開口20，20−１内にあって回転自在に設けられた永久磁石からなる回転子と、前記固定子と回転子とを磁気的に連結するために固定子と一対となって前記開口内の回転子位置に向けて設けられた複数の磁極片５−２，７−２，６−２，８−２と、前記回転子と電磁コイルより発生する磁束とから回転子に回転力を発生する感温アクチュエータにおいて、前記各磁極片５−２，７−２は互いに対峙して設けた一方の１対とすると共に、前記各磁極片６−２，８−２は互いに対峙して設けた他方の１対とし、前記一方の１対と前記他方の１対との回転子への対向面の面積を異ならせた。
【００１４】
本発明の請求項９に係る感温アクチュエータは、磁性材を用いて形成した閉磁路からなる固定子と、前記固定子の磁路内の開口にあって回転自在に設けられた永久磁石よりなる回転子と、前記固定子と回転子とを磁気的に連結するために、前記固定子に接続して夫々前記閉磁路内の回転子位置に向けて設けられた複数の磁極片５，６，７，８と、前記磁極片の内の１対の対峙する前記磁極片にキュリー温度の異なる複数個の感温磁性材９ａ，９ｂ，９ｃ及び１０ａ，１０ｂ，１０ｃを設けた。
【００１５】
本発明の請求項10に係る感温アクチュエータは、磁性材を用いて形成した閉磁路を２ａ，２ｂ，２ｃとに３分割した固定子と、前記固定子と一体になった複数の磁極片が突出して形成された開口内にあって回転自在に設けられた永久磁石よりなる回転子と、前記各固定子と回転子とを磁気的に連結するために、前記固定子に接続して夫々開口内の回転子位置に向けて設けられた複数の磁極片５−１，６−１，７−１，８−１と、前記分割された各固定子２ａ，２ｂ間にあって閉磁路を切欠いて設けた間隙と、前記２つの固定子２ａ，２ｂと残りの固定子２ｃとは互いに感温磁性材15ａ，15ｂを介在させることにより閉磁路を形成すると共に、前記接続された閉磁路には起磁力源12を設け、前記各磁極片５−１，７−１は互いに対峙して設けた一方の１対とすると共に、前記各磁極片６−１，８−１は互いに対峙して設けた他方の１対とし、前記一方の１対と前記他方の１対との回転子への対向面の面積を異ならせた。
【００１６】
本発明の請求項11に係る感温アクチュエータは、磁性材を用いて形成した閉磁路を２ａ，２ｂ，２ｃとに３分割した固定子と、前記固定子２ａはその両端に第１，第２の磁極片を夫々有して第１の１対とし、固定子２ｂは前記固定子２ａとの間に第１の感温磁性材１５ａを介在させて一体とすると共に前記固定子２ｂの端部を第３の磁極片とし、前記固定子２ｃは前記固定子２ａとの間に第２の感温磁性材 15 ｂを介在させて一体とすると共に前記固定子２ｃの端部を第４の磁極片とし、前記第３，第４の各磁極片を夫々有して第２の１対とし、前記第１の１対及び第２の１対とで囲まれた開口内には回転自在に設けられた永久磁石よりなる回転子を有し、前記固定子２ｃと２ａとの間及び前記固定子２ａと２ｂとの間には夫々第１，第２の各間隙を設けた。
【００１７】
本発明の請求項12に係る感温アクチュエータは、請求項11において、固定子２ａの磁路内には起磁力源12を設けた。
【００１８】
本発明の請求項13に係る感温アクチュエータは、請求項11において、固定子２ａの磁路内に磁気バランスのための補償部21を設けた。
【００１９】
本発明の請求項14に係る感温アクチュエータは、請求項13において、補償部はエアーギャップ14−１とした。
【００２１】
【作用】
本発明の［請求項１］，［請求項２］に係る感温アクチュエータは、低温時には感温磁性材は透磁率が大であって磁束を通し易い。したがって磁極片５，８を通る磁束と磁極片６，７を通る磁束とは等しい。しかし高温時には感温磁性材９，１０の透磁率が減少するため、回転子は左回転し閉弁方向に移動する。
【００２２】
本発明の［請求項３］，［請求項４］に係る感温アクチュエータは、低温時には透磁率が大であるため、磁極片５，７を通る磁束が磁極片６，８を通る磁束より大きい。しかし、高温時には感温磁性材の透磁率が小となり、感温磁性材部は空気中と同じになる。しかもエアーギャップｌ₂が感温磁性材の幅ｌ₁より小であるため、磁束は磁極片６，８を通るものが大となり、結果として回転子は左回転し閉弁方向に移動する。
【００２３】
本発明の［請求項５］，［請求項６］に係る感温アクチュエータは、低温時に感温磁性材１５は透磁率が大であるため、回転子からの磁束は磁極片５，７を通り易い。したがって回転子４は磁極片５，７を通る中心線側に傾斜している。しかし高温時には感温磁性材１５の透磁率が小となって磁極片５，７側を通る磁束は小となり、結果として磁極片６，８を通る中心線側に回転する。
【００２４】
本発明の［請求項７］，［請求項８］に係る感温アクチュエータは、低温時に感温磁性材の透磁率が大であるため、磁束は磁極片５−１，（５−２），７−１，（７−２）を通り易く、したがってロータは中心線ｄ側に回転している。しかし高温時には感温磁性材１５の透磁率が小となり、磁極片５−１，（５−２），７−１，（７−２）を通る磁束が小となる。したがって結果としてロータは中心線ｃ側へ回転する。
【００２５】
本発明の［請求項９］，［請求項１０］に係る感温アクチュエータは、低温時には感温磁性材９，１０の透磁率が大のため、磁極片５，７と磁極片６，８を通る磁束はバランスしている。高温時には感温磁性材９，１０の透磁率が小となるため、磁束は磁極片６，８側へ移り、その結果、ロータは閉弁方向へ回転する。このとき、感温磁性材９ａ，９ｂ，９ｃ，１０ａ，１０ｂ，１０ｃの温度特性の異なるものを組合せることにより、要求特性を高精度に合わすことができる。
【００２６】
本発明の［請求項１１］，［請求項１２］に係る感温アクチュエータは、低温時には感温磁性材は透磁率が大であって磁束を通し易い。したがって磁極片５，８を通る磁束と磁極片６，７を通る磁束とは等しい。しかし高温時には感温磁性材１５ａ，１５ｂの透磁率が減少するため、磁束の通路は磁極片５，７にかたより回転子は右回転し閉弁方向に移動する。
【００２７】
本発明の［請求項１３］，［請求項１４］に係る感温アクチュエータは、磁路内に磁気バランスのための補償部（エアーギャップ）を設けているため、これを調整することにより接合ギャップに生じる磁気抵抗分が補償できる。
【００２８】
本発明の［請求項１５］に係る感温アクチュエータは、予め感温磁性材と固定子との間に所定のエアーギャップを設けているため、磁路内の補償部（エアーギャップ）との間での加工精度の困難性がなくなる。
【００２９】
【実施例】
以下図面を参照して実施例を説明する。
図１は本発明の［請求項１］に係る感温アクチュエータの一実施例の構成図である。図１において、１は感温アクチュエータ本体であり、ヨーク２と、シャフト３と一体になったロータ磁石４と、ヨークとロータ磁石を磁気的に連結する磁極片５，６，７，８より構成されている。
【００３０】
ここで磁極片５と７及び６と８は対応した位置に設けられ、なかんずく、一方の磁極片５と７にはロータ磁石４の対向位置に負特性の感温磁性材９，１０を設ける。なお、感温磁性材とは温度に応じて透磁率が急激に変化するもので、温度の上昇につれて透磁率の増加するもの（正特性）と減少するもの（負特性）とがあるが、ここでは負特性のものを使用している。
【００３１】
次に作用について説明する。
本実施例では感温磁性材は負特性のものを使用している。したがって低温時には透磁率が大であるため、各磁極片５，７と６，８とは同等の磁束を通すため、ロータ磁石から出る磁束（実線）は、磁極片６からヨーク，磁極片７を通って戻るループと、磁極片５からヨーク，磁極片８を通って戻るループが対称となり、ロータ磁石４は中心に位置する。
【００３２】
又、高温時には感温磁性材の透磁率が減少するため、磁極片５，７を通る磁束が減少し、磁極片６、８を通る磁束が増大する。よってロータ磁石４は磁極片６、８へ引き寄せられる方向にトルクを生じ、ロータ磁石４は実線矢印方向に回転する。なお、温度が感温磁性材のキュリー温度に達すると常磁性に変わるため、それ以上に温度を上昇しても回転しない。この時の回転量は、感温磁性材の磁極片内の占有面積にて決まるため容易に設定できる。
【００３３】
図２は本発明の［請求項２］に係る感温アクチュエータの一実施例の構成図である。図２において図１と同一部分及び相当部分には同一符号を付して説明を省略する。本実施例では磁極片７，８の間でヨーク２を切除して間隙（エアーギャップ）１１をつくると共に、ヨークには起磁力源１２を設けたものである。その他の構成は図１と同様である。
【００３４】
次に作用について説明する。
この場合、基本的には起磁力源１２のコイルによって発生する磁束は、磁極片６から磁極片８を通るループ（ロータ磁石を閉弁方向に作用する）と、磁極片５から磁極片７を通るループ（ロータ磁石を開弁方向に作用する）を生成する。
【００３５】
したがって、高温時に感温磁性材の飽和磁束密度が低下すれば、磁極片５から磁極片７を通る磁束が減り、コイルによる開弁方向の作用が小さくなってＩＳＣの要求仕様を満足する。なお、感温磁性材の取付面積（占有面積）を変えることにより、温度変化に対応するロータの回転量を決定できるので、要求特性を得るための設計が容易である。
【００３６】
図３は本発明の［請求項３］に係る感温アクチュエータの一実施例の構成図である。図３において図１，図２と同一部分及び相当部分に対して同一符号を付して説明を省略する。本実施例はヨーク２ａと２ｂとの間に感温磁性材１３を設けると共に、ヨーク２ｂと２ｃとの間にエアーギャップ１４を設けた。この場合、前記感温磁性材の幅ｌ₁とエアーギャップｌ₂との関係をｌ₁＞ｌ₂とすることにより、特性変化ができる。
【００３７】
次に作用について説明する。
低温時は感温磁性材１３はヨーク２と同等の磁束を通すため、ロータ磁石４からの磁束は磁極片５からヨーク２ａ，感温磁性材１３，ヨーク２ｂ，磁極片７を通って戻るループが強く、磁極片６から磁極片８へ向う磁束はエアーギャップ１４を通るため弱い。その結果ロータ磁石４は中心線（磁極片５と磁極片６の間の線）より開弁側に回転する。
【００３８】
高温時は感温磁性材の飽和磁束密度が低下し、温度が感温磁性材のキュリー温度に達すると常磁性に変わり、感温磁性材部は空気が存在するのと同じとなる。この場合、ｌ₁＞ｌ₂に設定すれば、エアーギャップ14の方が感温磁性材の部分より磁気抵抗が小さくなる。したがって磁極片５，７を通る磁束が減少し、磁極片６，８を通る磁束が増加する。その結果、ロータ磁石４は磁極片６，８側へ引き寄せられる方向にトルクが発生し、ロータ磁石４は中心線より閉弁方向に回転する。
【００３９】
図４は本発明の［請求項４］に係る感温アクチュエータの一実施例の構成図である。図４において図３と同一部分及び相当部分に対しては同一符号を付して説明を省略する。本実施例では起磁力源１２を設けたものであり、その他の構成は図３と同様である。
【００４０】
先ず、起磁力源１２のコイルで発生する磁束は、磁極片６から磁極片８を通るループ（ロータ磁石を閉弁方向に作用する）と、磁極片５から磁極片７を通るループ（ロータ磁石を開弁方向に作用する）を生成する。そして高温時に感温磁性材の飽和磁束密度が低下すれば、磁極片５から磁極片７を通る磁束が減る。この場合、コイルによる開弁方向への作用が小さくなり、ＩＳＣの要求仕様を満足する。
【００４１】
図５は本発明の［請求項５］に係る感温アクチュエータの一実施例の構成図である。図５において図３と同一部分及び相当部分には同一符号を付して説明を省略する。本実施例と図３との相違点は、感温磁性材１５の設置位置を磁極片７と８との間としたことである（因みに図３では感温磁性材の設置位置は磁極片５と８との間である。）。
【００４２】
作用について説明すると、低温時は感温磁性材１５はヨーク２と同等に磁束を通すため、ロータ磁石４からの磁束は磁極片５からヨーク２ａ，感温磁性材１５，ヨーク２ｂ，磁極片７を通って戻るループが強い。なんとなれば磁極片６からヨーク２ｃへ向うループはエアーギャップ１４を通ることになるからである。その結果ロータ磁石は中心線より開弁側に回転する。
【００４３】
一方、高温時は感温磁性材１５の飽和磁束密度が低下するため、温度が感温磁性材のキュリー温度に達すると感温磁性材は常磁性に変わる。即ち、感温磁性材部は空気が存在するのと同じになり、この部分は大きな磁気抵抗となる。この場合、エアーギャップ１４の幅ｌ₂と感温磁性材１５の幅ｌ₁との間にはｌ₁＞ｌ₂の関係がある。そこで磁極片５，７を通る磁束が減少し、バランス位置が中心線側に移動する。但し、エアーギャップ１４があるため磁極片６，８を通る磁束ループより、磁極片５，７を通る磁束ループの方が強く、中心点より閉弁側までは移動しない。
【００４４】
図６は本発明の［請求項６］に係る感温アクチュエータの一実施例の構成図である。図６において図５と同一部分及び相当部分には同一符号を付して説明を省略する。本実施例では起磁力源１２を設けたものであり、その他の構成は図５と同様である。
【００４５】
先ず、起磁力源１２のコイルで発生する磁束は、磁極片６から８を通るループ（ロータ磁石を閉弁方向に作用する）と、磁極片５から７を通るループ（ロータ磁石を開弁方向に作用する）を生成する。しかし、高温時に感温磁性材１５の飽和磁束密度が低下すれば、コイルが作り出す磁束が減少する。したがってコイルのオン・オフによるロータ磁石のストロークは減少し、ＩＳＣの要求特性を満足する。
【００４６】
図７は本発明の［請求項７］に係る感温アクチュエータの一実施例の構成図である。図７において感温アクチュエータ本体１は感温磁性材１５を挾持する形でヨーク２ａ，２ｂを一体とし、更に感温磁性材の部分を磁路とするため、Ｔ形を有する空間１６を穿ってある。
【００４７】
５−１，７−１は対向面の広い磁極片で一対をなし、同じく６−１，８−１は対向面を狭くした磁極片で一対をなしている。４はロータ磁石で円形をなし、シャフト３を支点に回転する。なお、図からわかるように、ロータ磁石４の位置は磁極片５，７と磁極片６，８のロータ磁石４への対向面の割合で定まる。
【００４８】
図７において実線は低温時の磁路であり、点線は高温時の磁路である。次に作用説明であるが、低温時は感温磁性材１５はヨーク２と同等に磁束を通すため、ロータ磁石４からの磁束は磁極片５からヨーク２ａ，感温磁性材１５，ヨーク２ｂ，磁極片７−１を通って戻るループが強く、ロータ磁石４の中心線が磁極片５−１，７−１間の中心線ｄの位置でバランスする。
【００４９】
次に高温時は感温磁性材の飽和磁束密度が低下する。そして温度が感温磁性材のキュリー温度に達すると、感温磁性材は常磁性に変わってこの部分は空気が存在するのと同じとなり、磁束を通しにくくなる。この場合、磁極片５，８を通る磁束と、磁極片６，７を通る磁束が対称なループを形成してバランスする（図７の点線）。よってロータ磁石４の中心線はｃの位置となる（やゝ左回転する）。
【００５０】
図８は本発明の［請求項８］に係る感温アクチュエータの一実施例の構成図である。図８において１２は起磁力源であり、ヨーク２ａと２ｂとの間に感温磁性材を設けてある。１７は空間であり、その下方には連結部材１８，１９にて接続された構成を有し、そこに設けた開口２０内にはシャフト３に取付けた回転子４が回転可能に設けられている。
【００５１】
なお、回転子４の周囲は斜め両側面（左右）に広い開口２０，２０−１があり、それに対応する斜め両側面には狭い間隙２１が設けられる。したがって狭い間隙２１に対応した部分５−２，７−２は面積の広い磁極片となり、６−２，８−２は面積の狭い磁極片となる。
【００５２】
したがってコイルで発生する磁束は、磁極片６−２から８−２を通るループ（ロータ磁石を閉弁方向に作用する）と、磁極片５−２から７−２を通るループ（ロータ磁石を開弁方向に作用する）を生成する。高温時に感温磁性材１５の飽和磁束密度が低下すれば、磁極片６−２から８−２を通るループと磁極片５−２から７−２を通る磁束のループとの両方の磁束が減り、コイルの励磁時のロータのストロークが小さくなって、ＩＳＣの要求仕様を満足する。ヨーク２ａ，２ｂを連結している部材１８，１９は加工，組立のため必要がある。なお、磁気回路としては、断面積を小さく設定しているので影響はない。
【００５３】
図９は本発明の［請求項９］に係る感温アクチュエータの一実施例の構成図である。図９において図１と同一部分及び相当部分には同一符号を付して説明を省略する。図９の特徴部は感温磁性材９をキュリー温度の異なるもの、即ち、本実施例ではキュリー温度の低いものから順に９ａ，９ｂ，９ｃ及び１０ａ，１０ｂ，１０ｃとして組合せたものである。なお、感温磁性材は磁極片の一部に設けたものである。
【００５４】
したがって作用としては、先ず低温時は感温磁性材９ａ，９ｂ，９ｃ，１０ａ，１０ｂ，１０ｃは磁極片６，８と同等に磁束を通すため、ロータ磁石４から出る磁束は、磁極片６からヨーク，磁極片８を通って戻るループと、磁極片５からヨーク，磁極片８を通って戻るループが対称となり、ロータ磁石４は中心に位置する。
【００５５】
感温磁性材は温度が上昇すると飽和磁束密度が低下し、感温磁性材のキュリー温度に達すると常磁性に変わって、空気と同じレベルの磁束を通す状態となる。キュリー温度の異なる感温磁性材９ａ，９ｂ，９ｃ，１０ａ，１０ｂ，１０ｃを組み合わせることにより、温度上昇に伴なう磁極片５，７を通る磁束が減少の特性を任意に設定することができる。磁極片５，７を通る磁束の減少により、ロータ磁石４は磁極片６，８へ引き寄せられる方向にトルクが生じ、ロータ磁石４は回転する。この回転特性は精密に設定できる。
【００５６】
図１０は本発明の［請求項１０］に係る感温アクチュエータの一実施例の構成図である。図１０において図７と同一部分及び相当部分に対しては同一符号を付して説明を省略する。本実施例ではヨーク２ａ，２ｃ間に感温磁性材１５ａを配置し、ヨーク２ｂ，２ｃ間に感温磁性材１５ｂを配置する。磁極片５，７と６，８のロータ磁石４への対向面の割合でロータ位置が定まる。
【００５７】
したがって作用としては、低温時は感温磁性材はヨーク２と同等に磁束を通すので、ロータ磁石４から出る磁束は、磁極片５−１からヨーク２ａ，感温磁性材１５ａ，ヨーク２ｃ，感温磁性材１５ｂ，ヨーク２ｂ，磁極片７−１を通って戻るループが強く、ロータ磁石４の中心線が磁極片５−１，７−１間の中心線ｄの位置でバランスする。
【００５８】
温度が上昇すると感温磁性材の飽和磁束密度が低下する。ここで温度が感温磁性材のキュリー温度に達すると感温磁性材は常磁性に変わって、感温磁性材部は空気が存在するのと同じとなり、磁気を通しにくくなる。そこで磁極片５−１，８−１を通る磁束と、磁極片６−１，７−１を通る磁束が対称なループを形成してバランスする。よって、ロータ磁石４の中心線は中心線ｃの位置となる。このとき、各感温磁性材のキュリー点温度，厚さ，断面積を選ぶと、精密にロータの回転特性が得られる。起磁力源１２によりロータのコントロールができる。
【００５９】
図１１は本発明の［請求項１１］，［請求項１２］に係る感温アクチュエータの一実施例の構成図である。図11において固定子２ａは一対の磁極片５，７を有し、かつ中央位置には間隙１１ａ，１１ｂを設けてある。他の一対の磁極片６，８は分離して設けた固定子２ｂ，２ｃに設けられている。即ち、固定子は２ａ，２ｂ，２ｃのように３分割されている。
【００６０】
そして感温磁性材１５ａは固定子２ａと２ｂで挾持された形で固定子と一体になり、同じく感温磁性材１５ｂは固定子２ａと２ｃで挾持された形で固定子と一体になっている。１２は起磁力源であり、空間１６を介して上方に設けた磁路に接続されている（［請求項１２］）。
【００６１】
本発明の［請求項１１］，［請求項１２］に係る感温アクチュエータは、低温時には感温磁性材は透磁率が大であるため磁束を通し易い。したがって磁極片５，８を通る磁束と磁極片６，７を通る磁束とは等しい。しかし高温時には感温磁性材１５ａ，１５ｂの透磁率が減少するため、回転子は右回転して閉弁方向に移動する。なお、起磁力源が付加されているために、より一層動作が確実となる。
【００６２】
図１２は本発明の［請求項１３］に係る感温アクチュエータの一実施例の構成図である。図１２において図１１と同一部分及び相当部分には同一符号を付して説明を省略する。本実施例ではロータ磁石４を常時中心に位置させるようにしたものである。即ち、感温磁性材と固定子間の接合において生じる接合ギャップに原因して接合部に磁気抵抗が存在するため、低温時にロータ磁石４が中心より開側に少し回転した状態になることがある。
【００６３】
この開側に回転した分を補正するための手段として、接合ギャップの磁気抵抗に応じた磁気抵抗部（補償部と称する）２１を設けたものである。本実施例の場合、磁路内に丸い穴を穿ってその径の大小程度により、所望の補償量を得るようにしたものである。
【００６４】
図１３は本発明の［請求項１４］に係る感温アクチュエータの一実施例の構成図である。図１３において図１２と同一部分及び相当部分については同一符号を付して説明を省略する。本実施例では補償部として磁路中にエアーギャップ１４−１を設けたものである。本実施例ではギャップ長の調整により、所望の補償量を得ようとするものである。
【００６５】
図１４は本発明の［請求項１５］に係る感温アクチュエータの一実施例の構成図である。図１４において図１３と同一部分及び相当部分には同一符号を付して説明を省略する。接合ギャップは微小であるため、これを補償するためのエアーギャップ１４−１も小さくならざるを得ない。
【００６６】
そしてこのような加工は難しく、又、バラツキも生じる。したがって予め感温磁性材１５ａ，１５ｂと対応する固定子２ａ−１，２ｃとの間に所定のギャップ１８−１，１８−２を設けることにより、補償用のギャップの加工を容易にし、接合ギャップの影響を少なくするようにしたものである。
【００６７】
【発明の効果】
以上説明したように、本発明によれば負特性の感温磁性材を使い、低温時にロータのストロークが大きく移動し、高温時に閉弁付近で小さなストロークしか移動しない感温アクチュエータを提供できる。
【図面の簡単な説明】
【図１】本発明の請求項１に係る感温アクチュエータの一実施例の構成図。
【図２】本発明の請求項２に係る感温アクチュエータの一実施例の構成図。
【図３】本発明の請求項３に係る感温アクチュエータの一実施例の構成図。
【図４】本発明の請求項４に係る感温アクチュエータの一実施例の構成図。
【図５】本発明の請求項５に係る感温アクチュエータの一実施例の構成図。
【図６】本発明の請求項６に係る感温アクチュエータの一実施例の構成図。
【図７】本発明の請求項７に係る感温アクチュエータの一実施例の構成図。
【図８】本発明の請求項８に係る感温アクチュエータの一実施例の構成図。
【図９】本発明の請求項９に係る感温アクチュエータの一実施例の構成図。
【図１０】本発明の請求項10に係る感温アクチュエータの一実施例の構成図。
【図１１】本発明の請求項11，請求項12に係る感温アクチュエータの一実施例の構成図。
【図１２】本発明の請求項13に係る感温アクチュエータの一実施例の構成図。
【図１３】本発明の請求項14に係る感温アクチュエータの一実施例の構成図。
【図１４】ＩＳＣの弁体性制御用のロータリアクチュエータの特性図。[0001]
[Industrial application fields]
The present invention relates to a temperature-sensitive actuator that generates a driving force by detecting a temperature change of an environment or a specific device.
[0002]
[Prior art]
Depending on the control target, there is a case where it is desired to change the response condition in accordance with the environment or the temperature change of the device. For example, there is an idling speed controller (hereinafter referred to as ISC) mounted on an automobile. In this case, when the vehicle is idling, the intake air amount is affected by the engine temperature.
[0003]
Therefore, temperature sensing elements are attached at the required positions, and the control conditions are obtained by collecting the detection signals from each temperature sensing element. That is, when the engine temperature is high, the amount of bypass air is reduced, and conversely, when the engine temperature is low, the amount of bypass air is increased.
[0004]
In short, the valve body for ISC is required to have a large stroke at low temperatures, and at high temperatures, a specification that moves only a small stroke near the valve closing position is required as a countermeasure against runaway. FIG. 15 shows the required characteristics of a rotary actuator for ISC valve body control. The horizontal axis represents temperature T [° C.] and the vertical axis represents stroke [deg].
[0005]
[Problems to be solved by the invention]
If the above-mentioned control is to be performed, a control circuit that requires a plurality of temperature sensing elements corresponding to each position that requires measurement and that takes temperature conditions into account must be provided, resulting in structural complexity. In addition, there are problems of reliability and cost increase.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a temperature-sensitive actuator that can obtain the stroke characteristics according to temperature with a simple configuration.
[0006]
[Means for Solving the Problems]
A temperature-sensitive actuator according to claim 1 of the present invention is a rotation composed of a stator having a closed magnetic path made of a magnetic material, and a permanent magnet rotatably provided in an opening in the closed magnetic path of the stator. In order to magnetically connect the stator, the stator and the rotor, a plurality of magnetic pole pieces 5, 6, which are connected to the stator and project toward each other toward the center position in the closed magnetic path. 7 and 8 and at least a pair of opposing pole pieces of the pole pieces are provided with temperature-sensitive magnetic materials 9 and 10, respectively, on the respective rotor-side facing surfaces.
[0007]
A temperature sensitive actuator according to a second aspect of the present invention is the temperature sensitive actuator according to the first aspect, wherein the magnetic path of the stator is notched to provide a gap 11 and a magnetomotive force source 12 is provided in the magnetic path.
[0008]
According to a third aspect of the present invention, there is provided a temperature-sensitive actuator comprising a stator obtained by dividing a closed magnetic path formed of a magnetic material into two parts 2a, 2b, and 2c, and an opening in the closed magnetic path of the stator. A plurality of magnetic pole pieces 5, 6, 7 connected to the stator to magnetically connect the rotor made of permanent magnets provided on the stator and the divided stator and rotor to each other. , 8 and a temperature-sensitive magnetic material 13 is provided in the magnetic path between the divided stators 2a and 2b, and an air gap 14 is provided in the magnetic path between the stators 2b and 2c in the magnetic path. Was provided.
[0009]
According to a fourth aspect of the present invention, in the temperature sensitive actuator according to the third aspect, the magnetomotive force source 12 is provided in the magnetic path.
[0010]
According to a fifth aspect of the present invention, there is provided a temperature-sensitive actuator having a stator in which a closed magnetic path formed using a magnetic material is divided into 2a, 2b, and 2c, and an opening in the closed magnetic path of the stator. In order to magnetically connect the rotor made of a permanent magnet provided on the stator and the divided stator and the rotor, the rotor is connected to the stator and provided toward the center in the closed magnetic circuit. A plurality of magnetic pole pieces 5, 6, 7 and 8 and two magnetic pole pieces 7 and 8 which protrude between the divided stators 2a and 2b and project at a predetermined distance from each other toward the center in the closed magnetic path. A temperature-sensitive magnetic material 15 is provided at the position, and an air gap 14 is provided between the divided stators 2b and 2c.
[0011]
  A temperature sensitive actuator according to a sixth aspect of the present invention is the temperature sensitive actuator according to the fifth aspect,statorA magnetomotive force source 12 is provided in the magnetic path between 2a and 2b.
[0012]
  According to a seventh aspect of the present invention, there is provided a temperature-sensitive actuator in which a closed magnetic path formed using a magnetic material is divided into two parts 2a and 2b on the left and right sides of the center line, and the stator is integrated. In order to magnetically connect the stator and the rotor to a rotor made of a permanent magnet that is rotatably provided in an opening formed by projecting a plurality of magnetic pole pieces, the two pieces are divided. A plurality of magnetic pole pieces 5-1, 6-1, 7-1, 8-1 connected to the respective stators and provided toward the rotor position in the opening, respectively, and divided into twoAt one position where the center line is in contact with each of the stators 2a and 2b, there is a gap provided by notching a closed magnetic path, and at the other position where the center line is in contact with each of the stators 2a and 2b, there is not having a fixed magnetic path. In the gapBy interposing temperature-sensitive magnetic material 15Closed magnetic circuitThe magnetic pole pieces 5-1 and 7-1 are formed as one pair facing each other, and the magnetic pole pieces 6-1 and 8-1 are the other one provided facing each other. The areas of the facing surfaces of the one pair and the other pair to the rotor were made different.
[0013]
A temperature-sensitive actuator according to an eighth aspect of the present invention includes a stator in which a temperature-sensitive magnetic material 15 is interposed in a closed magnetic path formed using a magnetic material, an electromagnetic coil 12 provided in the stator, and the stator. In order to magnetically connect the stator and the rotor to a rotor made of a permanent magnet that is rotatably provided in the openings 20 and 20-1 provided to be biased right and left inside And a plurality of magnetic pole pieces 5-2, 7-2, 6-2, 8-2 provided toward the rotor position in the opening, and a magnetic flux generated from the rotor and the electromagnetic coil, In the temperature-sensitive actuator that generates a rotational force from the rotor to the rotor, the magnetic pole pieces 5-2 and 7-2 are one pair provided to face each other, and the magnetic pole pieces 6-2 and 8- 2 is the other pair provided opposite to each other, and the rotor of the one pair and the other pair With different areas of the opposing surfaces.
[0014]
  A temperature-sensitive actuator according to a ninth aspect of the present invention includes a stator having a closed magnetic path formed using a magnetic material, and a permanent magnet that is rotatably provided in an opening in the magnetic path of the stator. In order to magnetically connect the rotor and the stator and the rotor, a plurality of magnetic pole pieces 5, 6, respectively connected to the stator and provided toward the rotor position in the closed magnetic path 7 and 8 and a pair of opposing magnetic pole pieces, a plurality of temperature-sensitive magnetic materials 9a, 9b, 9c having different Curie temperatures.And 10a, 10b, 10cWas provided.
[0015]
  A temperature-sensitive actuator according to claim 10 of the present invention includes a stator obtained by dividing a closed magnetic path formed using a magnetic material into two parts 2a, 2b, and 2c, and a plurality of magnetic pole pieces integrated with the stator. In order to magnetically connect a rotor made of a permanent magnet in a projectingly formed opening and provided rotatably, the stator and the rotor are connected to the stator and opened individually. Between a plurality of magnetic pole pieces 5-1, 6-1, 7-1, 8-1 provided toward the rotor position and the divided stators 2a, 2b.A gap provided by notching a closed magnetic path;The two stators 2a and 2b and the remaining stator 2c are provided with temperature sensitive magnetic materials 15a and 15b interposed therebetween.Closed magnetic circuitIn addition, a magnetomotive force source 12 is provided in the connected closed magnetic path, and the magnetic pole pieces 5-1 and 7-1 are provided as one pair facing each other, and the magnetic pole pieces 6 -1 and 8-1 are the other pair provided opposite to each other, and the areas of the opposed surfaces of the one pair and the other pair to the rotor are different.
[0016]
  A temperature-sensitive actuator according to claim 11 of the present invention is a closed magnetic circuit formed using a magnetic material.TheStator divided into 2a, 2b, 2c, and the stator2a has first and second magnetic pole pieces at both ends to form a first pair, and the stator 2b is integrated with the first temperature-sensitive magnetic material 15a interposed between the stator 2a and the stator 2b. The end of the stator 2b is a third magnetic pole piece, and the stator 2c is a second temperature-sensitive magnetic material between the stator 2a and the stator 2a. 15 b is integrated, and the end of the stator 2c is a fourth magnetic pole piece, each of the third and fourth magnetic pole pieces is a second pair, and the first pair In the opening surrounded by the pair and the second pair, there is a rotor made of a permanent magnet rotatably provided, and between the stators 2c and 2a and between the stators 2a and 2b. Between the first and second gaps, respectively.
[0017]
According to Claim 12 of the present invention, in the temperature sensitive actuator according to Claim 11, the magnetomotive force source 12 is provided in the magnetic path of the stator 2a.
[0018]
The temperature sensitive actuator according to claim 13 of the present invention is the temperature sensitive actuator according to claim 11, wherein the compensation unit 21 for magnetic balance is provided in the magnetic path of the stator 2 a.
[0019]
According to claim 14 of the present invention, in the temperature sensitive actuator according to claim 13, the compensation portion is an air gap 14-1.
[0021]
[Action]
In the temperature-sensitive actuators according to [Claim 1] and [Claim 2] of the present invention, the temperature-sensitive magnetic material has a high magnetic permeability at a low temperature and easily allows magnetic flux to pass therethrough. Therefore, the magnetic flux passing through the pole pieces 5 and 8 is equal to the magnetic flux passing through the pole pieces 6 and 7. However, since the magnetic permeability of the temperature-sensitive magnetic materials 9 and 10 decreases at a high temperature, the rotor rotates counterclockwise and moves in the valve closing direction.
[0022]
Since the temperature-sensitive actuator according to [Claim 3] and [Claim 4] of the present invention has a high magnetic permeability at low temperatures, the magnetic flux passing through the magnetic pole pieces 5 and 7 is larger than the magnetic flux passing through the magnetic pole pieces 6 and 8. . However, at high temperatures, the magnetic permeability of the temperature-sensitive magnetic material is small, and the temperature-sensitive magnetic material portion is the same as in air. Moreover, the air gap l₂Is the width of the temperature sensitive magnetic material₁Since it is smaller, the magnetic flux that passes through the magnetic pole pieces 6 and 8 becomes larger, and as a result, the rotor rotates counterclockwise and moves in the valve closing direction.
[0023]
In the temperature-sensitive actuators according to [Claim 5] and [Claim 6] of the present invention, since the temperature-sensitive magnetic material 15 has a high magnetic permeability at low temperatures, the magnetic flux from the rotor passes through the pole pieces 5 and 7. easy. Therefore, the rotor 4 is inclined toward the center line passing through the magnetic pole pieces 5 and 7. However, when the temperature is high, the magnetic permeability of the temperature-sensitive magnetic material 15 is small, and the magnetic flux passing through the pole pieces 5 and 7 is small. As a result, the magnetic material 15 rotates toward the center line passing through the pole pieces 6 and 8.
[0024]
Since the temperature sensitive actuator according to [Claim 7] and [Claim 8] of the present invention has a large magnetic permeability of the temperature sensitive magnetic material at low temperature, the magnetic flux is magnetic pole pieces 5-1, (5-2), 7-1, (7-2), and therefore the rotor is rotating toward the center line d. However, when the temperature is high, the magnetic permeability of the temperature-sensitive magnetic material 15 is small, and the magnetic flux passing through the magnetic pole pieces 5-1, (5-2), 7-1, (7-2) is small. Therefore, as a result, the rotor rotates toward the center line c.
[0025]
The temperature-sensitive actuators according to [Claim 9] and [Claim 10] of the present invention have the magnetic pole pieces 5 and 7 and the magnetic pole pieces 6 and 8 because the magnetic permeability of the temperature-sensitive magnetic materials 9 and 10 is large at low temperatures. The passing magnetic flux is balanced. Since the magnetic permeability of the temperature-sensitive magnetic materials 9 and 10 becomes small at high temperatures, the magnetic flux moves to the magnetic pole pieces 6 and 8, and as a result, the rotor rotates in the valve closing direction. At this time, by combining the temperature-sensitive magnetic materials 9a, 9b, 9c, 10a, 10b, and 10c having different temperature characteristics, the required characteristics can be matched with high accuracy.
[0026]
In the temperature-sensitive actuators according to [Claim 11] and [Claim 12] of the present invention, the temperature-sensitive magnetic material has a high magnetic permeability and can easily pass magnetic flux at low temperatures. Therefore, the magnetic flux passing through the pole pieces 5 and 8 is equal to the magnetic flux passing through the pole pieces 6 and 7. However, since the magnetic permeability of the temperature-sensitive magnetic materials 15a and 15b decreases at a high temperature, the rotor of the magnetic flux path rotates in the clockwise direction from the magnetic pole pieces 5 and 7 and moves in the valve closing direction.
[0027]
In the temperature sensitive actuator according to [Claim 13] and [Claim 14] of the present invention, a compensation portion (air gap) for magnetic balance is provided in the magnetic path. Can be compensated for.
[0028]
Since the temperature-sensitive actuator according to [Claim 15] of the present invention is provided with a predetermined air gap between the temperature-sensitive magnetic material and the stator in advance, it is between the compensation section (air gap) in the magnetic path. This eliminates the difficulty of machining accuracy.
[0029]
【Example】
Embodiments will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 1] of the present invention. In FIG.1Is a temperature-sensitive actuator body, and is composed of a yoke 2, a rotor magnet 4 integrated with the shaft 3, and magnetic pole pieces 5, 6, 7, and 8 that magnetically connect the yoke and the rotor magnet.
[0030]
Here, the magnetic pole pieces 5 and 7 and the magnetic pole pieces 5 and 7 are provided at corresponding positions. In particular, one of the magnetic pole pieces 5 and 7 is provided with temperature-sensitive magnetic materials 9 and 10 having negative characteristics at positions facing the rotor magnet 4. Note that the temperature-sensitive magnetic material has a magnetic permeability that changes abruptly according to the temperature. There are materials that increase (positive characteristics) and decrease (negative characteristics) as the temperature increases. Then, the thing of a negative characteristic is used.
[0031]
Next, the operation will be described.
In this embodiment, the temperature-sensitive magnetic material has a negative characteristic. Therefore, since the magnetic permeability is large at low temperatures, the magnetic pole pieces 5, 7, 6, and 8 pass the same magnetic flux, so that the magnetic flux (solid line) emitted from the rotor magnet passes from the magnetic pole piece 6 to the yoke and the magnetic pole piece 7. The loop returning through and the loop returning from the magnetic pole piece 5 through the yoke and the magnetic pole piece 8 are symmetrical, and the rotor magnet 4 is located at the center.
[0032]
Further, since the magnetic permeability of the temperature-sensitive magnetic material decreases at a high temperature, the magnetic flux passing through the magnetic pole pieces 5 and 7 decreases, and the magnetic flux passing through the magnetic pole pieces 6 and 8 increases. Therefore, the rotor magnet 4 generates torque in the direction attracted to the magnetic pole pieces 6 and 8, and the rotor magnet 4 rotates in the direction of the solid arrow. When the temperature reaches the Curie temperature of the temperature-sensitive magnetic material, it changes to paramagnetism, so that it does not rotate even if the temperature is increased further. The amount of rotation at this time can be easily set because it is determined by the area occupied by the pole piece of the temperature-sensitive magnetic material.
[0033]
FIG. 2 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 2] of the present invention. In FIG. 2, the same parts as those in FIG. In this embodiment, the yoke 2 is cut between the magnetic pole pieces 7 and 8 to create a gap (air gap) 11 and a magnetomotive force source 12 is provided on the yoke. Other configurations are the same as those in FIG.
[0034]
Next, the operation will be described.
In this case, the magnetic flux generated by the coil of the magnetomotive force source 12 basically passes through the loop from the magnetic pole piece 6 to the magnetic pole piece 8 (acting the rotor magnet in the valve closing direction), and from the magnetic pole piece 5 to the magnetic pole piece 7. A loop that passes through (acts the rotor magnet in the valve opening direction) is generated.
[0035]
Therefore, if the saturation magnetic flux density of the temperature-sensitive magnetic material decreases at a high temperature, the magnetic flux passing from the magnetic pole piece 5 through the magnetic pole piece 7 is reduced, and the action in the valve opening direction by the coil is reduced to satisfy the ISC required specifications. In addition, since the rotation amount of the rotor corresponding to a temperature change can be determined by changing the mounting area (occupied area) of the temperature-sensitive magnetic material, the design for obtaining the required characteristics is easy.
[0036]
FIG. 3 is a block diagram of an embodiment of the temperature-sensitive actuator according to [Claim 3] of the present invention. In FIG. 3, the same parts as those in FIGS. In this embodiment, a temperature-sensitive magnetic material 13 is provided between the yokes 2a and 2b, and an air gap 14 is provided between the yokes 2b and 2c. In this case, the width l of the temperature-sensitive magnetic material₁And air gap l₂The relationship between₁> L₂Thus, the characteristics can be changed.
[0037]
Next, the operation will be described.
Since the temperature-sensitive magnetic material 13 passes a magnetic flux equivalent to that of the yoke 2 at a low temperature, the magnetic flux from the rotor magnet 4 returns from the magnetic pole piece 5 through the yoke 2a, the temperature-sensitive magnetic material 13, the yoke 2b, and the magnetic pole piece 7. The magnetic flux from the magnetic pole piece 6 to the magnetic pole piece 8 passes through the air gap 14 and is weak. As a result, the rotor magnet 4 rotates from the center line (line between the magnetic pole piece 5 and the magnetic pole piece 6) to the valve opening side.
[0038]
When the temperature is high, the saturation magnetic flux density of the temperature-sensitive magnetic material decreases, and when the temperature reaches the Curie temperature of the temperature-sensitive magnetic material, it changes to paramagnetism, and the temperature-sensitive magnetic material portion is the same as the presence of air. In this case, l₁> L₂Is set, the air gap 14 has a smaller magnetic resistance than the temperature-sensitive magnetic material portion. Accordingly, the magnetic flux passing through the pole pieces 5 and 7 is reduced, and the magnetic flux passing through the pole pieces 6 and 8 is increased. As a result, torque is generated in the direction in which the rotor magnet 4 is attracted toward the magnetic pole pieces 6 and 8, and the rotor magnet 4 rotates in the valve closing direction from the center line.
[0039]
FIG. 4 is a configuration diagram of one embodiment of a temperature-sensitive actuator according to [Claim 4] of the present invention. In FIG. 4, the same parts as those in FIG. In this embodiment, a magnetomotive force source 12 is provided, and the other configuration is the same as that shown in FIG.
[0040]
First, the magnetic flux generated by the coil of the magnetomotive force source 12 is a loop passing from the pole piece 6 to the pole piece 8 (acting the rotor magnet in the valve closing direction) and a loop passing from the pole piece 5 to the pole piece 7 (rotor magnet). Acting in the valve opening direction). If the saturation magnetic flux density of the temperature-sensitive magnetic material decreases at a high temperature, the magnetic flux passing from the magnetic pole piece 5 through the magnetic pole piece 7 decreases. In this case, the action of the coil in the valve opening direction is reduced, and the required specifications of ISC are satisfied.
[0041]
FIG. 5 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 5] of the present invention. In FIG. 5, the same parts as those in FIG. The difference between this embodiment and FIG. 3 is that the installation position of the temperature-sensitive magnetic material 15 is between the magnetic pole pieces 7 and 8 (in FIG. 3, the installation position of the temperature-sensitive magnetic material is the magnetic pole piece 5). And 8).
[0042]
In terms of operation, since the temperature-sensitive magnetic material 15 passes the magnetic flux in the same manner as the yoke 2 at low temperatures, the magnetic flux from the rotor magnet 4 flows from the magnetic pole piece 5 to the yoke 2a, the temperature-sensitive magnetic material 15, the yoke 2b, and the magnetic pole piece 7. Strong loop back through. This is because the loop from the pole piece 6 to the yoke 2c passes through the air gap 14. As a result, the rotor magnet rotates from the center line to the valve opening side.
[0043]
On the other hand, since the saturation magnetic flux density of the temperature-sensitive magnetic material 15 decreases at high temperatures, the temperature-sensitive magnetic material changes to paramagnetism when the temperature reaches the Curie temperature of the temperature-sensitive magnetic material. That is, the temperature-sensitive magnetic material portion is the same as the presence of air, and this portion has a large magnetic resistance. In this case, the width l of the air gap 14₂And the width l of the temperature-sensitive magnetic material 15₁L between₁> L₂There is a relationship. Therefore, the magnetic flux passing through the pole pieces 5 and 7 decreases, and the balance position moves to the center line side. However, since the air gap 14 is present, the magnetic flux loop passing through the magnetic pole pieces 5 and 7 is stronger than the magnetic flux loop passing through the magnetic pole pieces 6 and 8, and does not move from the center point to the valve closing side.
[0044]
FIG. 6 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 6] of the present invention. 6, the same parts as those in FIG. 5 and the corresponding parts are denoted by the same reference numerals, and the description thereof is omitted. In this embodiment, a magnetomotive force source 12 is provided, and the other configuration is the same as that shown in FIG.
[0045]
First, the magnetic flux generated by the coil of the magnetomotive force source 12 includes a loop passing through the pole pieces 6 to 8 (acting the rotor magnet in the valve closing direction) and a loop passing through the pole pieces 5 to 7 (the rotor magnet opening direction). To act on). However, if the saturation magnetic flux density of the temperature-sensitive magnetic material 15 decreases at a high temperature, the magnetic flux produced by the coil decreases. Therefore, the stroke of the rotor magnet due to on / off of the coil is reduced, and the required characteristics of ISC are satisfied.
[0046]
FIG. 7 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 7] of the present invention. In FIG. 7, the temperature-sensitive actuator body1In the shape of holding the temperature-sensitive magnetic material 15, the yokes 2a and 2b are integrated, and the temperature-sensitive magnetic material portion is used as a magnetic path, so that a space 16 having a T shape is formed.
[0047]
5-1 and 7-1 are a pair of magnetic pole pieces having a wide opposing surface, and 6-1 and 8-1 are a pair of magnetic pole pieces having a narrow opposing surface. Reference numeral 4 denotes a rotor magnet which is circular and rotates around the shaft 3 as a fulcrum. As can be seen from the figure, the position of the rotor magnet 4 is determined by the ratio of the opposing surfaces of the magnetic pole pieces 5 and 7 and the magnetic pole pieces 6 and 8 to the rotor magnet 4.
[0048]
In FIG. 7, the solid line is a magnetic path at a low temperature, and the dotted line is a magnetic path at a high temperature. Next, the operation will be explained. Since the temperature-sensitive magnetic material 15 passes the magnetic flux as much as the yoke 2 at low temperatures, the magnetic flux from the rotor magnet 4 is transferred from the pole piece 5 to the yoke 2a, the temperature-sensitive magnetic material 15, the yoke 2b, The loop returning through the pole piece 7-1 is strong, and the center line of the rotor magnet 4 is balanced at the position of the center line d between the pole pieces 5-1 and 7-1.
[0049]
Next, at high temperatures, the saturation magnetic flux density of the temperature-sensitive magnetic material decreases. When the temperature reaches the Curie temperature of the temperature-sensitive magnetic material, the temperature-sensitive magnetic material changes to paramagnetism, and this portion becomes the same as the presence of air, making it difficult to pass magnetic flux. In this case, the magnetic flux passing through the magnetic pole pieces 5 and 8 and the magnetic flux passing through the magnetic pole pieces 6 and 7 form a symmetrical loop to be balanced (dotted line in FIG. 7). Therefore, the center line of the rotor magnet 4 is at the position c (or rotates counterclockwise).
[0050]
FIG. 8 is a configuration diagram of one embodiment of a temperature-sensitive actuator according to the eighth aspect of the present invention. In FIG. 8, 12 is a magnetomotive force source, and a temperature-sensitive magnetic material is provided between the yokes 2a and 2b. Reference numeral 17 denotes a space having a structure connected by connecting members 18 and 19 below, and a rotor 4 attached to the shaft 3 is rotatably provided in an opening 20 provided there. .
[0051]
In addition, the circumference | surroundings of the rotor 4 have the wide opening 20 and 20-1 in diagonal both sides | surfaces (left and right), and the narrow clearance 21 is provided in the diagonal both sides corresponding to it. Accordingly, the portions 5-2 and 7-2 corresponding to the narrow gap 21 become pole pieces with a large area, and 6-2 and 8-2 become pole pieces with a small area.
[0052]
Therefore, the magnetic flux generated by the coil is a loop passing through the magnetic pole pieces 6-2 to 8-2 (acting the rotor magnet in the valve closing direction) and a loop passing through the magnetic pole pieces 5-2 to 7-2 (opening the rotor magnet). Acting on the valve direction). If the saturation magnetic flux density of the temperature-sensitive magnetic material 15 decreases at a high temperature, the magnetic flux in both the loop passing through the magnetic pole pieces 6-2 to 8-2 and the magnetic flux loop passing through the magnetic pole pieces 5-2 to 7-2 is reduced. The rotor stroke at the time of coil excitation becomes smaller and satisfies the required specifications of ISC. The members 18 and 19 connecting the yokes 2a and 2b are necessary for processing and assembly. The magnetic circuit is not affected because the cross-sectional area is set small.
[0053]
FIG. 9 is a block diagram of an embodiment of a temperature-sensitive actuator according to [Claim 9] of the present invention. In FIG. 9, the same parts as those in FIG. The characteristic portion of FIG. 9 is a combination of the temperature-sensitive magnetic material 9 having different Curie temperatures, that is, in the present embodiment, in order from the lowest Curie temperature, 9a, 9b, 9c and 10a, 10b, 10c. The temperature-sensitive magnetic material is provided on a part of the pole piece.
[0054]
Accordingly, as a function, since the temperature-sensitive magnetic materials 9a, 9b, 9c, 10a, 10b, and 10c first pass the magnetic flux in the same manner as the magnetic pole pieces 6 and 8 at a low temperature, the magnetic flux emitted from the rotor magnet 4 is from the magnetic pole piece 6. The loop returning through the yoke and pole piece 8 and the loop returning from the pole piece 5 through the yoke and pole piece 8 are symmetric, and the rotor magnet 4 is located at the center.
[0055]
When the temperature of the temperature-sensitive magnetic material rises, the saturation magnetic flux density decreases. When the temperature-sensitive magnetic material reaches the Curie temperature of the temperature-sensitive magnetic material, it changes to paramagnetism and passes the same level of magnetic flux as air. By combining the temperature-sensitive magnetic materials 9a, 9b, 9c, 10a, 10b, and 10c having different Curie temperatures, it is possible to arbitrarily set the characteristic that the magnetic flux passing through the magnetic pole pieces 5 and 7 is decreased as the temperature rises. . Due to the decrease of the magnetic flux passing through the pole pieces 5 and 7, torque is generated in the direction in which the rotor magnet 4 is attracted to the pole pieces 6 and 8, and the rotor magnet 4 rotates. This rotational characteristic can be set precisely.
[0056]
FIG. 10 is a block diagram of an embodiment of a temperature-sensitive actuator according to [Claim 10] of the present invention. In FIG. 10, the same parts as those in FIG. In this embodiment, the temperature sensitive magnetic material 15a is disposed between the yokes 2a and 2c, and the temperature sensitive magnetic material 15b is disposed between the yokes 2b and 2c. The rotor position is determined by the ratio of the facing surfaces of the pole pieces 5, 7 and 6, 8 to the rotor magnet 4.
[0057]
Accordingly, since the temperature-sensitive magnetic material passes the magnetic flux as much as the yoke 2 at low temperatures, the magnetic flux emitted from the rotor magnet 4 is changed from the magnetic pole piece 5-1 to the yoke 2a, the temperature-sensitive magnetic material 15a, the yoke 2c, The loop returning through the warm magnetic material 15b, the yoke 2b, and the magnetic pole piece 7-1 is strong, and the center line of the rotor magnet 4 is balanced at the position of the center line d between the magnetic pole pieces 5-1 and 7-1.
[0058]
When the temperature rises, the saturation magnetic flux density of the temperature-sensitive magnetic material decreases. Here, when the temperature reaches the Curie temperature of the temperature-sensitive magnetic material, the temperature-sensitive magnetic material changes to paramagnetism, and the temperature-sensitive magnetic material portion becomes the same as the presence of air, making it difficult to pass magnetism. Therefore, the magnetic flux passing through the magnetic pole pieces 5-1 and 8-1 and the magnetic flux passing through the magnetic pole pieces 6-1 and 7-1 form a symmetrical loop to be balanced. Therefore, the center line of the rotor magnet 4 is the position of the center line c. At this time, if the Curie point temperature, thickness, and cross-sectional area of each temperature-sensitive magnetic material are selected, the rotational characteristics of the rotor can be precisely obtained. The rotor can be controlled by the magnetomotive force source 12.
[0059]
FIG. 11 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [claim 11] and [claim 12] of the present invention. In FIG. 11, the stator 2a has a pair of magnetic pole pieces 5 and 7, and is provided with gaps 11a and 11b at the center position. The other pair of magnetic pole pieces 6 and 8 are provided on stators 2b and 2c provided separately. That is, the stator is divided into three parts 2a, 2b, and 2c.
[0060]
The temperature-sensitive magnetic material 15a is integrated with the stator in the form of being held between the stators 2a and 2b. Similarly, the temperature-sensitive magnetic material 15b is integrated with the stator in the form of being held between the stators 2a and 2c. Yes. A magnetomotive force source 12 is connected to a magnetic path provided above through a space 16 (claim 12).
[0061]
The temperature-sensitive actuators according to [Claim 11] and [Claim 12] of the present invention are easy to pass magnetic flux at low temperatures because the temperature-sensitive magnetic material has a high magnetic permeability. Therefore, the magnetic flux passing through the pole pieces 5 and 8 is equal to the magnetic flux passing through the pole pieces 6 and 7. However, since the magnetic permeability of the temperature-sensitive magnetic materials 15a and 15b decreases at a high temperature, the rotor rotates clockwise and moves in the valve closing direction. Since the magnetomotive force source is added, the operation is further ensured.
[0062]
FIG. 12 is a block diagram of an embodiment of the temperature-sensitive actuator according to [Claim 13] of the present invention. In FIG. 12, the same parts as those in FIG. In this embodiment, the rotor magnet 4 is always located at the center. In other words, since there is a magnetic resistance at the joint due to a joint gap formed in the joint between the temperature-sensitive magnetic material and the stator, the rotor magnet 4 may be slightly rotated from the center to the open side at a low temperature. .
[0063]
As a means for correcting the amount rotated to the open side, a magnetoresistive portion (referred to as a compensation portion) 21 corresponding to the magnetic resistance of the junction gap is provided. In the case of this embodiment, a round hole is formed in the magnetic path, and a desired compensation amount is obtained depending on the size of the diameter.
[0064]
FIG. 13 is a configuration diagram of one embodiment of a temperature-sensitive actuator according to [Claim 14] of the present invention. In FIG. 13, the same parts as those in FIG. In this embodiment, an air gap 14-1 is provided in the magnetic path as a compensation portion. In this embodiment, a desired compensation amount is obtained by adjusting the gap length.
[0065]
FIG. 14 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 15] of the present invention. In FIG. 14, the same parts as those in FIG. Since the junction gap is very small, the air gap 14-1 for compensating for this must be small.
[0066]
Such processing is difficult and also causes variations. Therefore, by providing the predetermined gaps 18-1 and 18-2 between the temperature-sensitive magnetic materials 15a and 15b and the corresponding stators 2a-1 and 2c in advance, the compensation gap can be easily processed, and the joining gap This is to reduce the influence of.
[0067]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a temperature-sensitive actuator that uses a temperature-sensitive magnetic material having a negative characteristic, and that moves the rotor stroke greatly at low temperatures and moves only a small stroke near the valve closure at high temperatures.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 1 of the present invention.
FIG. 2 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 2 of the present invention.
FIG. 3 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 3 of the present invention.
FIG. 4 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 4 of the present invention.
FIG. 5 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 5 of the present invention.
FIG. 6 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 6 of the present invention.
FIG. 7 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 7 of the present invention.
FIG. 8 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 8 of the present invention.
FIG. 9 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 9 of the present invention.
FIG. 10 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 10 of the present invention.
FIG. 11 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claims 11 and 12 of the present invention.
FIG. 12 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 13 of the present invention.
FIG. 13 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to claim 14 of the present invention.
FIG. 14 is a characteristic diagram of a rotary actuator for ISC valve body property control.

Claims

A stator having a closed magnetic path made of a magnetic material , a rotor made of a permanent magnet provided in an opening in the closed magnetic path of the stator, and the stator and the rotor are magnetically connected. A plurality of magnetic pole pieces 5 , 6 , 7 , 8 connected to the stator and projecting toward the center position in the closed magnetic path, and at least a pair of the magnetic pole pieces. temperature-sensitive actuator of the opposed pole pieces, characterized in that a respective temperature-sensitive magnetic material 9, 10 to each rotor side facing surface.

2. The temperature-sensitive actuator according to claim 1 , wherein a gap 11 is provided by cutting out the magnetic path of the stator, and a magnetomotive force source 12 is provided in the magnetic path.

A stator obtained by dividing a closed magnetic path formed by using a magnetic material into three parts 2a, 2b, and 2c; a rotor formed of a permanent magnet provided in an opening in the closed magnetic path of the stator; In order to magnetically connect the divided stator and the rotor , a plurality of magnetic pole pieces 5, 6, 7, 8 connected to the stator, and the divided stators 2a, 2a, the temperature-sensitive magnetic material 13 is provided on the magnetic path between 2b, the temperature-sensitive actuator is characterized by providing an air gap 14 in the magnetic path between each of the stator 2b and 2c in said magnetic path.

4. The temperature sensitive actuator according to claim 3, wherein a magnetomotive force source 12 is provided in the magnetic path.

A stator obtained by dividing a closed magnetic path formed by using a magnetic material into three parts 2a, 2b, and 2c; a rotor formed of a permanent magnet provided in an opening in the closed magnetic path of the stator; In order to magnetically connect the divided stator and rotor , a plurality of magnetic pole pieces 5, 6, 7, 8 connected to the stator and provided toward the center in the closed magnetic path, , the divided stator 2a, together with there between 2b provided temperature-sensitive magnetic material 15 at a position between the two pole pieces 7 and 8 which protrudes at a predetermined distance toward the center of the closed magnetic path together A temperature sensitive actuator, wherein an air gap 14 is provided between each of the divided stators 2b and 2c.

6. The temperature sensitive actuator according to claim 5, wherein a magnetomotive force source 12 is provided in a magnetic path between the stators 2a and 2b.

In the opening formed by protruding a closed magnetic path formed of a magnetic material into two parts 2a and 2b on the left and right sides of the center line, and a plurality of magnetic pole pieces integrated with the stator In order to magnetically connect the stator and the rotor to each other, the rotor made of a permanent magnet provided rotatably, and connected to each of the two divided stators, a plurality of pole pieces 5-1,6-1,7-1,8-1 provided toward the rotor position, the two divided centerline each stator 2a, in one position in contact with 2b Is closed by providing a temperature-sensitive magnetic material 15 in a gap provided by notching a fixed magnetic path and a gap provided by notching a fixed magnetic path at the other position where the center line contacts each of the stators 2a and 2b. road is formed, to said respective pole piece 5-1,7-1 is one of a pair provided to face each other In addition, the magnetic pole pieces 6-1 and 8-1 are the other pair provided opposite to each other, and the areas of the facing surfaces of the one pair and the other pair to the rotor are different. A temperature-sensitive actuator.

A stator having a closed magnetic path by interposing a temperature-sensitive magnetic material 15 formed of a magnetic material, an electromagnetic coil 12 provided in the stator, an opening 20 provided deviate to the left and right in the stator, 20 and the rotor comprising a permanent magnet provided rotatably be in the -1, the rotor position within the opening becomes stator pair to connecting the stator and the rotor magnetically Temperature-sensitive actuator that generates a rotational force on the rotor from a plurality of magnetic pole pieces 5-2, 7-2, 6-2, and 8-2 provided toward the rotor and a magnetic flux generated by the rotor and the electromagnetic coil The magnetic pole pieces 5-2 and 7-2 are one pair provided opposite to each other, and the magnetic pole pieces 6-2 and 8-2 are the other pair provided opposite to each other. be characterized in that the content, with different areas of the opposing surfaces of the rotor and the one pair and the other pair Temperature-sensitive actuator.

A stator composed of a closed magnetic path formed using a magnetic material, a rotor composed of a permanent magnet provided in an opening in the magnetic path of the stator, and the stator and the rotor are magnetized. A plurality of pole pieces 5, 6, 7, 8 connected to the stator and directed toward the rotor position in the closed magnetic path, respectively, and a pair of the pole pieces. A temperature-sensitive actuator comprising a plurality of temperature-sensitive magnetic materials 9a, 9b, 9c and 10a , 10b , 10c having different Curie temperatures on the pole pieces facing each other.

A stator in which a closed magnetic path formed by using a magnetic material is divided into 2a, 2b, and 2c, and a plurality of magnetic pole pieces integrated with the stator are in an opening formed so as to be rotatable. In order to magnetically connect the rotor composed of the provided permanent magnet and each of the stator and the rotor, a plurality of rotors connected to the stator and respectively provided toward the rotor position in the opening are provided. A pole piece 5-1, 6-1, 7-1, 8-1; a gap provided between each of the divided stators 2a, 2b by notching a closed magnetic path; and the two stators 2a, 2b, The remaining stator 2c forms a closed magnetic path by interposing temperature-sensitive magnetic materials 15a and 15b with each other, and a magnetomotive force source 12 is provided in the connected closed magnetic path, and the magnetic pole pieces 5-1, Reference numeral 7-1 denotes one pair provided opposite to each other, and the magnetic pole pieces 6-1 and 8 are provided. 1 as the other pair provided to face each other, the temperature-sensitive actuator, characterized in that with different areas of the opposing surfaces of the rotor and the one pair and the other pair.

2a a closed magnetic path formed by using a magnetic material, 2b, and 3 divided stator 2c, the stator 2a is first, the second pole piece and each having a first pair at both ends The stator 2b is integrated with the first temperature-sensitive magnetic material 15a interposed between the stator 2a and the end of the stator 2b is a third magnetic pole piece, and the stator 2c is A second temperature-sensitive magnetic material 15b is interposed between the stator 2a and the stator 2a so as to be integrated, and the end of the stator 2c is used as a fourth magnetic pole piece, and the third and fourth magnetic pole pieces are respectively used. A second pair, and a rotor made of a permanent magnet rotatably provided in an opening surrounded by the first pair and the second pair, and the stator temperature sensitive actuator, characterized in that a respective first, second respective gaps between and between the stator 2a and 2b between 2c and 2a .

12. The temperature sensitive actuator according to claim 11, wherein a magnetomotive force source 12 is provided in the magnetic path of the stator 2a.

12. The temperature sensitive actuator according to claim 11, wherein a compensation portion 21 for magnetic balance is provided in the magnetic path of the stator 2a.

In temperature-sensitive actuator according to claim 13, wherein the temperature-sensitive actuator, wherein the compensation unit is an air gap 14 -1.