JP4085372B2

JP4085372B2 - Signal cable for resolver

Info

Publication number: JP4085372B2
Application number: JP2003007018A
Authority: JP
Inventors: 昌樹桑原
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2002-01-15
Filing date: 2003-01-15
Publication date: 2008-05-14
Anticipated expiration: 2023-01-15
Also published as: JP2003279377A

Description

【０００１】
【発明の属する技術分野】
本発明はモータ等の回転角度位置を検出するために用いられるレゾルバ信号を伝達するためのケーブルの配線構造に関する。
【０００２】
【従来の技術】
ダイレクトドライブモータ等の回転角度位置を検出するための装置として、レゾルバ装置が用いられている。レゾルバ装置は、ロータ鉄心とステータ歯間の空隙中のリラクタンスがロータ鉄心位置により変化することを利用したものであり、１相励磁３相出力タイプのものでは、ステータポールに巻回された巻線に励磁信号を供給すると、位相が１２０°づつずれた１サイクルの交流信号Ａ相、Ｂ相及びＣ相が検出される。従来のダイレクトドライブモータシステムでは、レゾルバに励磁信号を供給するとともに、レゾルバ信号を得るためのレゾルバ用信号ケーブルがドライブユニットとダイレクトドライブモータ間を結線していた。アナログ信号の伝送に使用されるレゾルバ用信号ケーブルは、その選定にあたって、線径が太いものの他に、ケーブル内の線間静電容量が小さいものが好ましい。
【０００３】
【発明が解決しようとする課題】
しかし、従来のレゾルバ用信号ケーブルでは、図９乃至図１１に示すように、励磁信号線と各相検出信号線間の配置、及び各相検出信号線間の配置について、何らの配慮もなく結線されていたため、励磁信号線と各相検出信号線間の静電容量、及び各相検出信号線間の静電容量に不平衡が生じていた。図９は１相励磁３相出力のレゾルバ用信号ケーブルの断面図であり、５０はレゾルバ用信号ケーブル、５１はＡ相検出信号線、５２はＢ相検出信号線、５３はＣ相検出信号線、５４はドライブユニットからレゾルバ装置へ励磁信号を供給するための励磁信号線（共通信号線）である。この形態のレゾルバ用信号ケーブルでは、励磁信号線５４とＡ相検出信号線５１、Ｂ相検出信号線５２、Ｃ相検出信号線５３間の静電容量を各々Ｃ_A，Ｃ_B，Ｃ_Cとすれば、Ｃ_A＝Ｃ_B≠Ｃ_Cとなり、不平衡である。さらに、Ａ相検出信号線５１とＢ相検出信号線５２間の静電容量をＣ_AB、Ｂ相検出信号線５２とＣ相検出信号線５３間の静電容量をＣ_BC、Ｃ相検出信号線５３とＡ相検出信号線５１間の静電容量をＣ_CAとすれば、Ｃ_AB＝Ｃ_BC≠Ｃ_CAとなり、不平衡である。この不平衡はケーブルの長さが変更されたときなどには、各相の検出信号線にも影響が生じ、レゾルバ用信号ケーブルの絶対精度に誤差を生じる原因となっている。
【０００４】
図１０は１相励磁で２種類の３相出力を得るレゾルバ用信号ケーブルの断面図であり、６０はレゾルバ用信号ケーブル、６１〜６３は各々第１のＡ相、Ｂ相、及びＣ相の検出信号線、６４〜６６は第２のＡ相、Ｂ相、及びＣ相の検出信号線である。６７は励磁信号線（共通信号線）である。この形態のレゾルバ用信号ケーブルでは、励磁信号線６７と第１のＡ相、Ｂ相、及びＣ相の検出信号線６１〜６３との間の静電容量を各々Ｃ_1A，Ｃ_1B，Ｃ_1Cとし、励磁信号線６７と第２のＡ相、Ｂ相、及びＣ相の検出信号線６４〜６６との間の静電容量を各々Ｃ_2A，Ｃ_2B，Ｃ_2Cとすれば、Ｃ_1A≠Ｃ_1B≠Ｃ_1CかつＣ_2A≠Ｃ_2B≠Ｃ_2Cとなり、不平衡である。また、各相の検出信号線相互間においても、第１のＡ相及びＢ相間、第１のＢ相及びＣ相間、第１のＣ相及びＡ相間の検出信号線間の静電容量を各々Ｃ_1AB，Ｃ_1BC，Ｃ_1CAとし、第２のＡ相及びＢ相間、第２のＢ相及びＣ相間、第２のＣ相及びＡ相間の検出信号線間の静電容量を各々Ｃ_2AB，Ｃ_2BC，Ｃ_2CAとすれば、Ｃ₁ _AB＝Ｃ_1BC≠Ｃ_1CAかつＣ_2AB＝Ｃ_2BC≠Ｃ_2CAとなり、不平衡である。
【０００５】
図１１は１相励磁で２種類の３相出力を得るレゾルバ用信号ケーブルの他の構造の断面図であり、７０はレゾルバ用信号ケーブル、７１〜７３は各々第１のＡ相、Ｂ相、及びＣ相の検出信号線、７４〜７６は第２のＡ相、Ｂ相、及びＣ相の検出信号線である。７７は励磁信号線（共通信号線）である。この形態のレゾルバ用信号ケーブルでは、励磁信号線７７と第１のＡ相、Ｂ相、及びＣ相の検出信号線７１〜７３との間の静電容量を各々Ｃ_1A，Ｃ_1B，Ｃ_1Cとし、励磁信号線７７と第２のＡ相、Ｂ相、及びＣ相の検出信号線７４〜７６との間の静電容量を各々Ｃ_2A，Ｃ_2B，Ｃ_2Cとすれば、Ｃ_1A＝Ｃ_1B＝Ｃ_1CかつＣ_2A＝Ｃ_2B＝Ｃ_2Cとなり、バランスのとれた配置となっているが、第１のＡ相及びＢ相間、第１のＢ相及びＣ相間、第１のＣ相及びＡ相間の検出信号線間の静電容量を各々Ｃ_1AB，Ｃ_1BC，Ｃ_1CAとし、第２のＡ相及びＢ相間、第２のＢ相及びＣ相間、第２のＣ相及びＡ相間の検出信号線間の静電容量を各々Ｃ_2AB，Ｃ_2BC，Ｃ_2CAとすれば、Ｃ_1AB＝Ｃ_1BC≠Ｃ_1CAかつＣ_2AB＝Ｃ_2BC≠Ｃ_2CAとなり、不平衡である。
【０００６】
上記のように、レゾルバ用信号ケーブル内の励磁信号線及び各相の検出信号線相互間の静電容量が不均衡であると、ケーブルの長さを自由自在に変更したい場合や、極長にしたい場合には、静電容量の不均衡に起因して、各信号線間に電気的な干渉が生じ、レゾルバの測定誤差の原因となり、従来のように単に線間静電容量の小さいケーブルの選定だけでは機能を満足できない場合が生じていた。特に、レゾルバ用信号ケーブルを流れる信号は微少なアナログ電流であるため、ケーブル長の長短に影響されて、レゾルバの精度を劣化させ易い。
【０００７】
そこで、本発明は上記問題点を解決し、レゾルバ用信号ケーブル内の励磁信号線と各相の検出信号線間の静電容量、及び各相の検出信号線間の静電容量のバランスを確保することにより、レゾルバ用信号ケーブルの性能向上を図ることを課題とする。
【０００８】
【課題を解決するための手段】
上記の課題を解決するため、本発明のレゾルバ用信号ケーブルは、レゾルバ装置へ励磁信号を供給するための少なくとも１以上の励磁信号線、及びレゾルバ装置から出力される多相レゾルバ信号を伝送するための複数の検出信号線を含む多芯構造のレゾルバ信号用ケーブルにおいて、前記複数の検出信号線の各々と励磁信号線間の静電容量の平均値が概略等しく、かつ、隣り合う相の検出信号線の各々の静電容量の平均値が概略等しくなるように、前記励磁信号線及び検出信号線が配されてなる。かかる構成により、励磁信号線と検出信号線の不平衡、及び多相検出信号線間の不平衡を解消することができ、ケーブル長の変更や極長の使用において、信号の性能が左右されないレゾルバ用信号ケーブルを提供することができる。また、ケーブル内の各信号線の配置まで考慮することにより、ケーブル長の長短や個体差による影響を極力低減することができる。
【０００９】
【発明の実施の形態】
発明の実施の形態１．
図１は１相励磁３相出力のレゾルバ用信号ケーブルの断面構造図である。同図において、１０はレゾルバ用信号ケーブル、１１，１２，及び１３は各々Ａ相、Ｂ相、及びＣ相の検出信号線、１４は励磁信号線（共通信号線）であり、４芯構造を成している。各信号線は軸方向に撚れており、どの断面においても正確に同図に示す断面構造となっているわけではないが、平均化すると各信号線の配置は同図に示す位置関係を保っている。各相の信号線１１，１２，及び１３は各々正三角形の頂点に位置し、励磁信号線１４は当該正三角形の重心に位置している。このため、信号線１１と信号線１２の距離、信号線１２と信号線１３の距離、信号線１３と信号線１１の距離は等しく、さらに、各信号線１１，１２，及び１３と励磁信号線１４との距離も等しい。このため、各信号線１１，１２，及び１３と励磁信号線１４間の静電容量をＣ_A，Ｃ_B，Ｃ_Cとし、信号線１１と信号線１２間の静電容量をＣ_AB、信号線１２と信号線１３間の静電容量をＣ_BC、信号線１３と信号線１１間の静電容量をＣ_CAとすれば、Ｃ_A＝Ｃ_B＝Ｃ_CかつＣ_AB＝Ｃ_BC＝Ｃ_CAとなり、各相の検出信号線と励磁信号線間の静電容量、及び各相の検出信号線間の静電容量のバランスを確保することができる。
【００１０】
図５はレゾルバ用信号ケーブル１０を中心とするダイレクトドライブモータシステムの概略構成図である。同図において、８０はレゾルバ信号に基づいて位置検出を行うドライブユニット、９０はレゾルバ装置を含むモータ部である。励磁信号電源８１から出力される励磁信号は励磁信号線１４を伝達してレゾルバ装置の巻線９１に供給される。各相の巻線９１からは検出信号線１１，１２，１３を介してレゾルバ信号が出力され、センス抵抗Ｒ１，Ｒ２，Ｒ３を介して検出される。
【００１１】
本実施形態によれば、▲１▼ケーブル長が自在に選択でき、かつ使用する信号の保証範囲を広げることができる、▲２▼極長のケーブル長選択が可能となる、▲３▼生産向上の現場において、信号線の検査に製品と同等品ケーブルを使用する必要がなくなる、▲４▼線間の静電容量がより小さいものを選定しなくてよい、▲５▼出荷検査時に使用したケーブルをセットにして管理する必要がない、といったメリットがあり、本実施形態のレゾルバ用信号ケーブルをダイレクトドライブモータシステムに採用することで、位置決め精度の向上と安定、低振動化、低騒音化の面で格段の向上を図ることができる。本実施形態のレゾルバ用信号ケーブルは、例えば、相対位置検出用レゾルバを備えたダイレクトドライブモータのレゾルバ用信号ケーブルとして使用できる。また、本実施形態のレゾルバ用信号ケーブル２本を１組として、相対位置検出用レゾルバ及び絶対位置検出用レゾルバの双方を備えたモータに適用し、相対位置検出用レゾルバ及び絶対位置検出用レゾルバのレゾルバ信号用ケーブルとして使用できる。
【００１２】
尚、本実施形態は、励磁信号線と検出信号線の不平衡、及び多相検出信号線間の不平衡を解消することのできる配置であれば、芯数、レゾルバ信号の相数等に制限されるものではなく、また、ツイストペア線、ツイストシールド線等にも適用できる。以下に説明する各実施形態においても同様である。
【００１３】
発明の実施の形態２．
図２は３相励磁３相出力のレゾルバ用信号ケーブルの断面構造図である。同図において、２０はレゾルバ用信号ケーブル、２１，２２，及び２３は各々Ａ相、Ｂ相、及びＣ相の検出信号線、２４，２５，及び２６は各々Ａ相、Ｂ相、及びＣ相の励磁信号線（共通信号線）であり、６芯構造を成している。各信号線は軸方向に撚れており、どの断面においても正確に同図に示す断面構造となっているわけではないが、平均化すると各信号線の配置は同図に示す位置関係を保っている。各相の信号線２１，２２，及び２３は第１の正三角形の各頂点に位置し、励磁信号線２４，２５，及び２６は第２の正三角形の各頂点に位置する。第１の正三角形と第２の正三角形は同形同大であり、その重心は各々レゾルバ用信号ケーブル２０の中心点に一致し、かつ当該中心点において点対称となっている。図形の対称性から、信号線２１と２４の距離、信号線２２と２５の距離、信号線２３と２６の距離は各々等しく、また、信号線２１と２２の距離、信号線２２と２３の距離、信号線２３と２１の距離は各々等しい。このため、信号線２１と２４間の静電容量をＣ_A、信号線２２と２５間の静電容量をＣ_B、信号線２３と２６間の静電容量をＣ_Cとし、信号線２１と信号線２２間の静電容量をＣ_AB、信号線２２と信号線２３間の静電容量をＣ_BC、信号線２３と信号線２１間の静電容量をＣ_CAとすれば、Ｃ_A＝Ｃ_B＝Ｃ_CかつＣ_AB＝Ｃ_BC＝Ｃ_CAとなり、各相の検出信号線と励磁信号線間の静電容量、及び各相の検出信号線間の静電容量のバランスを確保することができる。
【００１４】
図６はレゾルバ用信号ケーブル２０を中心とするダイレクトドライブモータシステムの概略構成図である。同図において、８０はレゾルバ信号に基づいて位置検出を行うドライブユニット、９０はレゾルバ装置を含むモータ部である。励磁信号線２０１はドライブユニット８０内において一本に収束しており、３本の励磁信号線２４，２５，２６に分岐した状態でレゾルバ信号用ケーブル２０内に配線され、モータ部９０内において再び一本に収束している。このように、励磁信号線２０１を３本に分けることで、レゾルバ用信号ケーブル２０の作成が容易となる。図１に示されているように、上述の実施形態１の構成では検出信号線間の距離が大きくなるため、隣接する検出信号線間の距離を略等間隔にして撚り線を形成することが困難となるが、本実施形態によれば、近接した位置に励磁信号線と検出信号線を配置できるため、撚り線の形成が容易となる。励磁信号電源８１から出力される励磁信号は励磁信号線２０１を伝達してレゾルバ装置の巻線９１に供給される。各相の巻線９１からは検出信号線２１，２２，２３を介してレゾルバ信号が出力され、センス抵抗Ｒ１，Ｒ２，Ｒ３を介して検出される。
【００１５】
本実施形態によれば、上記▲１▼〜▲５▼のメリットがあり、本実施形態のレゾルバ用信号ケーブルをダイレクトドライブモータシステムに採用することで、位置決め精度の向上と安定、低振動化、低騒音化の面で格段の向上を図ることができる。本実施形態のレゾルバ用信号ケーブルは、例えば、相対位置検出用レゾルバを備えたダイレクトドライブモータのレゾルバ用信号ケーブルとして使用できる。また、本実施形態のレゾルバ用信号ケーブル２本を１組として、相対位置検出用レゾルバ及び絶対位置検出用レゾルバの双方を備えたモータに適用し、相対位置検出用レゾルバ及び絶対位置検出用レゾルバのレゾルバ信号用ケーブルとして使用できる。
【００１６】
発明の実施の形態３．
図３は１相励磁３相出力のレゾルバ用信号ケーブルの断面構造図である。本実施形態では、レゾルバ信号は２種類の３相出力となっており、３０はレゾルバ用信号ケーブル、３１，３２，及び３３は各々第１のＡ相、Ｂ相、及びＣ相の検出信号線、３４，３５，及び３６は各々第２のＡ相、Ｂ相、及びＣ相の検出信号線、３７は励磁信号線（共通信号線）であり、７芯構造を成している。レゾルバ用信号ケーブル３０は相対位置検出用レゾルバ及び絶対位置検出用レゾルバの双方を備えたモータ１台、或いは相対位置検出用レゾルバ及び絶対位置検出用レゾルバの何れか一方を備えたモータ２台への接続用に用いることができる。
【００１７】
各信号線は軸方向に撚れており、どの断面においても正確に同図に示す断面構造となっているわけではないが、平均化すると各信号線の配置は同図に示す位置関係を保っている。第１のＡ相、Ｂ相、及びＣ相の検出信号線３１，３２，及び３３は第１の正三角形の各頂点に位置し、第２のＡ相、Ｂ相、及びＣ相の検出信号線３４，３５，及び３６は第２の正三角形の各頂点に位置している。第１の正三角形と第２の正三角形は同形同大であり、その重心は各々レゾルバ用信号ケーブル３０の中心点に一致し、かつ当該中心点において点対称となっている。また、レゾルバ用信号ケーブル３０の中心点は励磁信号線３７の中心点に一致する。図形の対称性から、信号線３１〜３６の各々と励磁信号線３７との距離は等しく、また、信号線３１と３２の距離、信号線３２と３３の距離、信号線３３と３１の距離、信号線３４と３５の距離、信号線３５と３６の距離、信号線３６と３４の距離は全て等しい。
【００１８】
このため、信号線３１と３７間の静電容量をＣ_1A、信号線３２と３７間の静電容量をＣ_1B、信号線３３と３７間の静電容量をＣ_1C、信号線３４と３７間の静電容量をＣ_2A、信号線３５と３７間の静電容量をＣ_2B、信号線３６と３７間の静電容量をＣ_2C、信号線３１と３２間の静電容量をＣ_1A1B、信号線３２と３３間の静電容量をＣ_1B1C、信号線３３と３１間の静電容量をＣ_1C1A、信号線３４と３５間の静電容量をＣ_2A2B、信号線３５と３６間の静電容量をＣ_2B2C、信号線３６と３４間の静電容量をＣ_2C2Aとすれば、Ｃ_1A＝Ｃ_1B＝Ｃ_1C＝Ｃ_2A＝Ｃ_2B＝Ｃ_2CかつＣ_1A1B＝Ｃ_1B1C＝Ｃ_1C1A＝Ｃ_2A2B＝Ｃ_2B2C＝Ｃ_2C2Aとなる。
【００１９】
図７はレゾルバ用信号ケーブル３０を中心とするダイレクトドライブモータシステムの概略構成図である。同図において、８０はレゾルバ信号に基づいて位置検出を行うドライブユニット、９０はレゾルバ装置を含むモータ部である。励磁信号電源８１から出力される励磁信号は励磁信号線３７を伝達してレゾルバ装置の巻線９１に供給される。各相の巻線９１からは検出信号線３１〜３６を介してレゾルバ信号が出力され、センス抵抗Ｒ１〜Ｒ６を介して検出される。
【００２０】
本実施形態によれば、上記▲１▼〜▲５▼のメリットがあり、本実施形態のレゾルバ用信号ケーブルをダイレクトドライブモータシステムに採用することで、位置決め精度の向上と安定、低振動化、低騒音化の面で格段の向上を図ることができる。
【００２１】
発明の実施の形態４．
図４は１相励磁３相出力のレゾルバ用信号ケーブルの断面構造図である。本実施形態では、レゾルバ信号は２種類の３相出力となっており、４０はレゾルバ用信号ケーブル、４１，４２，及び４３は各々第１のＡ相、Ｂ相、及びＣ相の検出信号線、４４，４５，及び４６は各々第２のＡ相、Ｂ相、及びＣ相の検出信号線、４７，４８，及び４９は励磁信号線（共通信号線）であり、９芯構造を成している。レゾルバ用信号ケーブル４０は相対位置検出用レゾルバ及び絶対位置検出用レゾルバの双方を備えたモータ１台、或いは相対位置検出用レゾルバ及び絶対位置検出用レゾルバの何れか一方を備えたモータ２台への接続用に用いることができる。
【００２２】
各信号線は軸方向に撚れており、撚りのピッチ或いは撚りの方向を外側の６本（符号４４〜４９）と内側の３本（符号４１〜４３）とで異なるようにしている。このことにより、どの断面においても正確に同図に示す断面構造となっているわけではないが、平均化すると各信号線の配置は同図に示す位置関係を保っている。励磁信号線を３本に分けて図４のように構成したことにより、実施形態３の効果に加えて、２組の検出線同士のクロストークの発生を抑制できる効果が得られる。このような効果を得るべく、励磁信号線を３本に分けるのは、ケーブル部分のみで十分なため、ドライバ装置とモータ部の内部では励磁信号線は１本に収束されている。
【００２３】
第１のＡ相、Ｂ相、及びＣ相の検出信号線４１，４２，及び４３は第１の正三角形の各頂点に位置し、第２のＡ相、Ｂ相、及びＣ相の検出信号線４４，４５，及び４６は第２の正三角形の各頂点に位置している。また、励磁信号線４７，４８，及び４９は第３の正三角形の各頂点に位置している。第１、第２及び第３の正三角形の各々の重心はレゾルバ用信号ケーブル４０の中心点に一致し、第２の正三角形と第３の正三角形は同形同大で前記中心点に関して点対称である。また、検出信号線４１，４２，及び４３は内円４０Ａに内接し、検出信号線４４，４５，及び４６、励磁信号線４７，４８，及び４９は内円４０Ａに外接している。図形の対称性から、信号線４１と４７の距離、信号線４２と４８の距離、信号線４３と４９の距離は等しく、信号線４７と４４の距離、信号線４９と４５の距離、信号線４８と４６の距離も等しい。また、信号線４１と４２の距離、信号線４２と４３の距離、信号線４３と４１の距離も等しく、信号線４４と４５、信号線４５と４６、信号線４６と４４の距離も等しい。
【００２４】
このため、信号線４７と４１間の静電容量をＣ_1A、信号線４８と４２間の静電容量をＣ_1B、信号線４９と４３間の静電容量をＣ_1C、信号線４７と４４間の静電容量をＣ_2A、信号線４９と４５間の静電容量をＣ_2B、信号線４８と４６間の静電容量をＣ_2C、信号線４１と４２間の静電容量をＣ_1A1B、信号線４２と４３間の静電容量をＣ_1B1C、信号線４３と４１間の静電容量をＣ_1C1A、信号線４４と４５間の静電容量をＣ_2A2B、信号線４５と４６間の静電容量をＣ_2B2C、信号線４６と４４間の静電容量をＣ_2C2Aとすれば、Ｃ_1A＝Ｃ_1B＝Ｃ_1CかつＣ_2A＝Ｃ_2B＝Ｃ_2CかつＣ_1A1B＝Ｃ_1B1C＝Ｃ_1C1AかつＣ_2A2B＝Ｃ_2B2C＝Ｃ_2C2Aとなる。
【００２５】
図８はレゾルバ用信号ケーブル４０を中心とするダイレクトドライブモータシステムの概略構成図である。同図において、８０はレゾルバ信号に基づいて位置検出を行うドライブユニット、９０はレゾルバ装置を含むモータ部である。励磁信号線４０１はドライブユニット８０内において一本に収束しており、３本の励磁信号線４７，４８，４９に分岐した状態でレゾルバ信号用ケーブル４０内に配線され、モータ部９０内において再び一本に収束している。励磁信号電源８１から出力される励磁信号は励磁信号線４０１を伝達してレゾルバ装置の巻線９１に供給される。各相の巻線９１からは検出信号線４１〜４６を介してレゾルバ信号が出力され、センス抵抗Ｒ１〜Ｒ６を介して検出される。
【００２６】
本実施形態によれば、上記▲１▼〜▲５▼のメリットがあり、本実施形態のレゾルバ用信号ケーブルをダイレクトドライブモータシステムに採用することで、位置決め精度の向上と安定、低振動化、低騒音化の面で格段の向上を図ることができる。
【００２７】
【発明の効果】
本発明によれば、励磁信号線と検出信号線間の静電容量の不平衡、及び多相検出信号線間の静電容量の不平衡を解消し、ケーブル長の変更や極長の使用において、信号の性能が左右されないレゾルバ用信号ケーブルを提供することができる。
【図面の簡単な説明】
【図１】第１の実施形態に係わるレゾルバ用信号ケーブルの断面構造図である。
【図２】第２の実施形態に係わるレゾルバ用信号ケーブルの断面構造図である。
【図３】第３の実施形態に係わるレゾルバ用信号ケーブルの断面構造図である。
【図４】第４の実施形態に係わるレゾルバ用信号ケーブルの断面構造図である。
【図５】第１の実施形態に係わるダイレクトドライブモータシステムの概略構成図である。
【図６】第２の実施形態に係わるダイレクトドライブモータシステムの概略構成図である。
【図７】第３の実施形態に係わるダイレクトドライブモータシステムの概略構成図である。
【図８】第４の実施形態に係わるダイレクトドライブモータシステムの概略構成図である。
【図９】第１の従来例におけるレゾルバ用信号ケーブルの断面構造図である。
【図１０】第２の従来例におけるレゾルバ用信号ケーブルの断面構造図である。
【図１１】第３の従来例におけるレゾルバ用信号ケーブルの断面構造図である。
【符号の説明】
１０，２０，３０，４０，５０，６０，７０…レゾルバ用信号ケーブル
１１，２１，３１，３４，４１，４４…Ａ相検出信号線
１２，２２，３２，３５，４２，４５…Ｂ相検出信号線
１３，２３，３３，３６，４３，４６…Ｃ相検出信号線
１４，２４，２５，２６，３７，４７，４８，４９…励磁信号線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable wiring structure for transmitting a resolver signal used for detecting a rotational angle position of a motor or the like.
[0002]
[Prior art]
A resolver device is used as a device for detecting a rotational angle position of a direct drive motor or the like. The resolver device utilizes the fact that the reluctance in the gap between the rotor iron core and the stator teeth varies depending on the position of the rotor iron core. In the one-phase excitation three-phase output type, the winding wound around the stator pole When the excitation signal is supplied to, one cycle of AC signals A phase, B phase and C phase whose phases are shifted by 120 ° are detected. In the conventional direct drive motor system, an excitation signal is supplied to the resolver, and a resolver signal cable for obtaining the resolver signal connects between the drive unit and the direct drive motor. In selecting a resolver signal cable used for analog signal transmission, a cable having a small inter-line capacitance in the cable is preferable in addition to one having a large wire diameter.
[0003]
[Problems to be solved by the invention]
However, in the conventional resolver signal cable, as shown in FIG. 9 to FIG. 11, the wiring between the excitation signal line and each phase detection signal line and between each phase detection signal line is connected without any consideration. As a result, there is an unbalance between the capacitance between the excitation signal line and each phase detection signal line and the capacitance between each phase detection signal line. FIG. 9 is a cross-sectional view of a resolver signal cable with one-phase excitation and three-phase output. 50 is a resolver signal cable, 51 is an A-phase detection signal line, 52 is a B-phase detection signal line, and 53 is a C-phase detection signal line. , 54 are excitation signal lines (common signal lines) for supplying excitation signals from the drive unit to the resolver device. In the resolver signal cable of this embodiment, the capacitance between the excitation signal line 54 and the A-phase detection signal line 51, the B-phase detection signal line 52, and the C-phase detection signal line 53 is set to C _A , C _B , C _C , respectively. Then, C _A = C _B ≠ C _C , which is unbalanced. Furthermore, the capacitance between the A phase detection signal line 51 and the B phase detection signal line 52 is C _AB , and the capacitance between the B phase detection signal line 52 and the C phase detection signal line 53 is C _BC , and the C phase detection signal If the capacitance between the line 53 and the A-phase detection signal line 51 is C _CA , C _AB = C _BC ≠ C _CA , which is unbalanced. This unbalance causes the detection signal line of each phase when the cable length is changed, and causes an error in the absolute accuracy of the resolver signal cable.
[0004]
FIG. 10 is a cross-sectional view of a resolver signal cable that obtains two types of three-phase outputs by one-phase excitation, 60 is a resolver signal cable, and 61 to 63 are first A-phase, B-phase, and C-phase, respectively. Detection signal lines 64 to 66 are second A-phase, B-phase, and C-phase detection signal lines. Reference numeral 67 denotes an excitation signal line (common signal line). In the resolver signal cable of this embodiment, the capacitance between the excitation signal line 67 and the first A-phase, B-phase, and C-phase detection signal lines 61 to 63 is set to C _1A , C _1B , C _1C , respectively. If the capacitances between the excitation signal line 67 and the second A-phase, B-phase, and C-phase detection signal lines 64 to 66 are C _2A , C _2B , and C _2C , respectively, C _1A ≠ C _1B ≠ C _1C and C _2A ≠ C _2B ≠ C _2C , which is unbalanced. Also, between the detection signal lines of each phase, the capacitance between the detection signal lines between the first A phase and the B phase, between the first B phase and the C phase, and between the first C phase and the A phase, respectively. C _1AB , C _1BC , and C _1CA, and the capacitances between the detection signal lines between the second A phase and the B phase, between the second B phase and the C phase, and between the second C phase and the A phase are respectively C _2AB , If C _2BC and C _2CA , then C ₁ _AB = C _1BC ≠ C _1CA and C _2AB = C _2BC ≠ C _2CA , which is unbalanced.
[0005]
FIG. 11 is a cross-sectional view of another structure of a signal cable for resolver that obtains two types of three-phase outputs by one-phase excitation. 70 is a signal cable for resolver, 71 to 73 are first A phase, B phase, And C-phase detection signal lines 74 to 76 are second A-phase, B-phase, and C-phase detection signal lines. Reference numeral 77 denotes an excitation signal line (common signal line). In the resolver signal cable of this embodiment, the capacitance between the excitation signal line 77 and the first A-phase, B-phase, and C-phase detection signal lines 71 to 73 is set to C _1A , C _1B , C _1C , respectively. If the capacitances between the excitation signal line 77 and the second A-phase, B-phase, and C-phase detection signal lines 74 to 76 are C _2A , C _2B , and C _2C , respectively, C _1A = Although C _1B = C _1C and C _2A = C _2B = C _2C , the arrangement is balanced, but between the first A phase and the B phase, between the first B phase and the C phase, and the first C phase. and a phases of the detection signal line between the capacitance of each C _1AB, C _1BC, and C _1CA, the second a-phase and B phase, the second B-phase and C phase, the second phase C and a phase If the capacitances between the detection signal lines are C _2AB , C _2BC , and C _2CA , C _1AB = C _1BC ≠ C _1CA and C _2AB = C _2BC ≠ C _2CA , which is unbalanced.
[0006]
As described above, if the capacitance between the excitation signal line and the detection signal line of each phase in the resolver signal cable is unbalanced, the length of the cable can be freely changed or If this is desired, electrical interference occurs between the signal lines due to capacitance imbalance, which causes measurement errors in the resolver. In some cases, selection alone could not satisfy the functions. In particular, since the signal flowing through the resolver signal cable is a minute analog current, it is easily affected by the length of the cable, and the resolver accuracy is likely to deteriorate.
[0007]
Therefore, the present invention solves the above problems and ensures a balance between the capacitance between the excitation signal line in the resolver signal cable and the detection signal line of each phase and the capacitance between the detection signal lines of each phase. Thus, it is an object to improve the performance of the resolver signal cable.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a signal cable for a resolver according to the present invention transmits at least one excitation signal line for supplying an excitation signal to a resolver device, and a multiphase resolver signal output from the resolver device. In the resolver signal cable having a multi-core structure including a plurality of detection signal lines, the average value of the capacitance between each of the plurality of detection signal lines and the excitation signal line is approximately equal, and detection signals of adjacent phases The excitation signal line and the detection signal line are arranged so that the average value of the capacitance of each line is approximately equal. With this configuration, the unbalance between the excitation signal line and the detection signal line and the unbalance between the polyphase detection signal lines can be eliminated, and the resolver whose signal performance is not affected when the cable length is changed or the pole length is used. A signal cable can be provided. In addition, by considering the arrangement of each signal line in the cable, the influence of the length of the cable and the individual difference can be reduced as much as possible.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 of the Invention
FIG. 1 is a cross-sectional structure diagram of a resolver signal cable having one-phase excitation and three-phase output. In the figure, 10 is a resolver signal cable, 11, 12, and 13 are A-phase, B-phase, and C-phase detection signal lines, respectively, 14 is an excitation signal line (common signal line), and has a four-core structure. It is made. Each signal line is twisted in the axial direction, and the cross-sectional structure shown in the figure is not exactly the same in any cross section. However, when averaged, the arrangement of the signal lines maintains the positional relationship shown in the figure. ing. The signal lines 11, 12, and 13 of each phase are located at the vertices of the equilateral triangle, and the excitation signal line 14 is located at the center of gravity of the equilateral triangle. For this reason, the distance between the signal line 11 and the signal line 12, the distance between the signal line 12 and the signal line 13, and the distance between the signal line 13 and the signal line 11 are equal, and each of the signal lines 11, 12, and 13 and the excitation signal line. The distance to 14 is also equal. Therefore, the capacitances between the signal lines 11, 12, and 13 and the excitation signal line 14 are C _A , C _B , and C _C, and the capacitance between the signal line 11 and the signal line 12 is C _AB , If the capacitance between the line 12 and the signal line 13 is C _BC , and the capacitance between the signal line 13 and the signal line 11 is C _CA , then C _A = C _B = C _C and C _AB = C _BC = C _It becomes _CA , and the balance between the capacitance between the detection signal lines and the excitation signal lines of each phase and the capacitance between the detection signal lines of each phase can be ensured.
[0010]
FIG. 5 is a schematic configuration diagram of a direct drive motor system centered on the resolver signal cable 10. In the figure, reference numeral 80 denotes a drive unit for detecting a position based on a resolver signal, and 90 denotes a motor unit including a resolver device. The excitation signal output from the excitation signal power supply 81 is transmitted to the excitation signal line 14 and supplied to the winding 91 of the resolver device. A resolver signal is output from the winding 91 of each phase via the detection signal lines 11, 12, and 13 and is detected via the sense resistors R1, R2, and R3.
[0011]
According to this embodiment, (1) cable length can be freely selected and the guaranteed range of signals to be used can be expanded, (2) extremely long cable length can be selected, and (3) production improvement It is no longer necessary to use a cable equivalent to the product for the inspection of the signal line at the site of (4). (4) It is not necessary to select a cable with a smaller capacitance between the lines. (5) Cable used at the time of shipping inspection The resolver signal cable of this embodiment is used in a direct drive motor system to improve positioning accuracy, stability, low vibration, and low noise. In this way, a significant improvement can be achieved. The resolver signal cable of the present embodiment can be used as, for example, a resolver signal cable of a direct drive motor provided with a relative position detection resolver. Also, the two resolver signal cables of this embodiment are applied as a set to a motor having both a relative position detecting resolver and an absolute position detecting resolver, and the relative position detecting resolver and the absolute position detecting resolver are applied. It can be used as a resolver signal cable.
[0012]
Note that this embodiment is limited to the number of cores, the number of phases of the resolver signal, etc., as long as the arrangement can eliminate the unbalance between the excitation signal line and the detection signal line and the unbalance between the multiphase detection signal lines. In addition, the present invention can also be applied to twisted pair wires, twisted shield wires, and the like. The same applies to each embodiment described below.
[0013]
Embodiment 2 of the Invention
FIG. 2 is a sectional view of a resolver signal cable having three-phase excitation and three-phase output. In the figure, 20 is a resolver signal cable, 21, 22, and 23 are A-phase, B-phase, and C-phase detection signal lines, respectively, 24, 25, and 26 are A-phase, B-phase, and C-phase, respectively. Excitation signal line (common signal line), which has a six-core structure. Each signal line is twisted in the axial direction, and the cross-sectional structure shown in the figure is not exactly the same in any cross section. However, when averaged, the arrangement of the signal lines maintains the positional relationship shown in the figure. ing. The signal lines 21, 22, and 23 of each phase are located at the vertices of the first equilateral triangle, and the excitation signal lines 24, 25, and 26 are located at the vertices of the second equilateral triangle. The first equilateral triangle and the second equilateral triangle have the same shape and the same size, and their centroids coincide with the center point of the resolver signal cable 20 and are symmetric with respect to the center point. Because of the symmetry of the figure, the distance between the signal lines 21 and 24, the distance between the signal lines 22 and 25, and the distance between the signal lines 23 and 26 are equal, and the distance between the signal lines 21 and 22 and the distance between the signal lines 22 and 23 The distance between the signal lines 23 and 21 is equal. Therefore, the capacitance between the signal lines 21 and 24 is C _A , the capacitance between the signal lines 22 and 25 is C _B , and the capacitance between the signal lines 23 and 26 is C _C. If the capacitance between the signal lines 22 is C _AB , the capacitance between the signal lines 22 and 23 is C _BC , and the capacitance between the signal lines 23 and 21 is C _CA , then C _A = C _B = C _C and C _AB = C _BC = C _CA , and ensure the balance between the capacitance between the detection signal lines of each phase and the excitation signal line and the capacitance between the detection signal lines of each phase. Can do.
[0014]
FIG. 6 is a schematic configuration diagram of a direct drive motor system centered on the resolver signal cable 20. In the figure, reference numeral 80 denotes a drive unit for detecting a position based on a resolver signal, and 90 denotes a motor unit including a resolver device. The excitation signal line 201 converges to one in the drive unit 80, and is routed in the resolver signal cable 20 in a state of being branched into three excitation signal lines 24, 25, 26, and again in the motor unit 90. Converged in the book. In this way, by dividing the excitation signal line 201 into three, the resolver signal cable 20 can be easily created. As shown in FIG. 1, since the distance between the detection signal lines is increased in the configuration of the above-described first embodiment, the stranded wires can be formed with the distances between the adjacent detection signal lines being substantially equal. Although it becomes difficult, according to the present embodiment, the excitation signal line and the detection signal line can be arranged at close positions, so that the stranded wire can be easily formed. The excitation signal output from the excitation signal power supply 81 is transmitted to the excitation signal line 201 and supplied to the winding 91 of the resolver device. A resolver signal is output from the winding 91 of each phase via the detection signal lines 21, 22, 23, and is detected via the sense resistors R1, R2, R3.
[0015]
According to the present embodiment, there are merits (1) to (5) described above. By adopting the resolver signal cable of the present embodiment in a direct drive motor system, positioning accuracy is improved and stable, and vibration is reduced. A marked improvement can be achieved in terms of noise reduction. The resolver signal cable of the present embodiment can be used as, for example, a resolver signal cable of a direct drive motor provided with a relative position detection resolver. Also, the two resolver signal cables of this embodiment are applied as a set to a motor having both a relative position detecting resolver and an absolute position detecting resolver, and the relative position detecting resolver and the absolute position detecting resolver are applied. It can be used as a resolver signal cable.
[0016]
Embodiment 3 of the Invention
FIG. 3 is a cross-sectional structure diagram of a resolver signal cable having one-phase excitation and three-phase output. In this embodiment, the resolver signal has two types of three-phase outputs, 30 is a resolver signal cable, 31, 32, and 33 are first A-phase, B-phase, and C-phase detection signal lines, respectively. , 34, 35, and 36 are detection signal lines for the second A-phase, B-phase, and C-phase, respectively, and 37 is an excitation signal line (common signal line), which has a seven-core structure. The resolver signal cable 30 is connected to one motor having both a relative position detecting resolver and an absolute position detecting resolver, or two motors having either a relative position detecting resolver and an absolute position detecting resolver. Can be used for connection.
[0017]
Each signal line is twisted in the axial direction, and the cross-sectional structure shown in the figure is not exactly the same in any cross section. However, when averaged, the arrangement of the signal lines maintains the positional relationship shown in the figure. ing. The first A-phase, B-phase, and C-phase detection signal lines 31, 32, and 33 are located at the vertices of the first equilateral triangle, and the second A-phase, B-phase, and C-phase detection signals. Lines 34, 35, and 36 are located at the vertices of the second equilateral triangle. The first equilateral triangle and the second equilateral triangle have the same shape and the same size, and their centroids coincide with the center point of the resolver signal cable 30 and are symmetric with respect to the center point. The center point of the resolver signal cable 30 coincides with the center point of the excitation signal line 37. From the symmetry of the figure, the distance between each of the signal lines 31 to 36 and the excitation signal line 37 is equal, the distance between the signal lines 31 and 32, the distance between the signal lines 32 and 33, the distance between the signal lines 33 and 31, The distance between the signal lines 34 and 35, the distance between the signal lines 35 and 36, and the distance between the signal lines 36 and 34 are all equal.
[0018]
For this reason, the capacitance between the signal lines 31 and 37 is C _1A , the capacitance between the signal lines 32 and 37 is C _1B , the capacitance between the signal lines 33 and 37 is C _1C , and the signal lines 34 and 37. electrostatic capacity C _2A between, the electrostatic capacity C _2B between the signal lines 35 and 37, the electrostatic capacity C _2C between the signal lines 36 and 37, the capacitance between the signal line 31 and 32 C _1a1b , The capacitance between the signal lines 32 and 33 is C _1B1C , the capacitance between the signal lines 33 and 31 is C _1C1A , the capacitance between the signal lines 34 and 35 is C _2A2B , and between the signal lines 35 and 36. the electrostatic capacitance C _2B2C, if the capacitance between the signal lines 36 and 34 and _{_{_{C 2C2A, C 1A = C 1B}}} = C 1C = C 2A = C 2B = C 2C and C _1A1B = C _1B1C = C _1C1A = C _2A2B = C _2B2C = C _2C2A
[0019]
FIG. 7 is a schematic configuration diagram of a direct drive motor system centered on the resolver signal cable 30. In the figure, reference numeral 80 denotes a drive unit for detecting a position based on a resolver signal, and 90 denotes a motor unit including a resolver device. An excitation signal output from the excitation signal power supply 81 is transmitted to the excitation signal line 37 and supplied to the winding 91 of the resolver device. A resolver signal is output from the winding 91 of each phase via the detection signal lines 31 to 36, and is detected via the sense resistors R1 to R6.
[0020]
According to the present embodiment, there are merits (1) to (5) described above. By adopting the resolver signal cable of the present embodiment in a direct drive motor system, positioning accuracy is improved and stable, and vibration is reduced. A marked improvement can be achieved in terms of noise reduction.
[0021]
Embodiment 4 of the Invention
FIG. 4 is a cross-sectional structure diagram of a resolver signal cable having one-phase excitation and three-phase output. In the present embodiment, the resolver signal has two types of three-phase outputs, 40 is a resolver signal cable, 41, 42, and 43 are first A-phase, B-phase, and C-phase detection signal lines, respectively. , 44, 45, and 46 are detection signal lines for the second A phase, B phase, and C phase, respectively, and 47, 48, and 49 are excitation signal lines (common signal lines), which form a nine-core structure. ing. The resolver signal cable 40 is connected to one motor having both a relative position detecting resolver and an absolute position detecting resolver, or two motors having either a relative position detecting resolver and an absolute position detecting resolver. Can be used for connection.
[0022]
Each signal line is twisted in the axial direction, and the twisting pitch or twisting direction is different between the outer six (reference numerals 44 to 49) and the inner three (reference numerals 41 to 43). Accordingly, the cross-sectional structure shown in the figure is not exactly the same in any cross-section, but the arrangement of the signal lines maintains the positional relationship shown in the figure when averaged. Since the excitation signal lines are divided into three and configured as shown in FIG. 4, in addition to the effects of the third embodiment, an effect of suppressing the occurrence of crosstalk between the two sets of detection lines can be obtained. In order to obtain such an effect, it is sufficient to divide the excitation signal lines into three, because only the cable portion is sufficient. Therefore, the excitation signal lines are converged to one inside the driver device and the motor unit.
[0023]
The first A-phase, B-phase, and C-phase detection signal lines 41, 42, and 43 are located at the vertices of the first equilateral triangle, and the second A-phase, B-phase, and C-phase detection signals. Lines 44, 45, and 46 are located at the vertices of the second equilateral triangle. The excitation signal lines 47, 48, and 49 are located at the vertices of the third equilateral triangle. The center of gravity of each of the first, second, and third equilateral triangles coincides with the center point of the signal cable 40 for resolver, and the second and third equilateral triangles have the same shape and the same size, and the point with respect to the center point. Symmetric. The detection signal lines 41, 42, and 43 are inscribed in the inner circle 40A, and the detection signal lines 44, 45, and 46 and the excitation signal lines 47, 48, and 49 are inscribed in the inner circle 40A. From the symmetry of the figure, the distance between the signal lines 41 and 47, the distance between the signal lines 42 and 48, the distance between the signal lines 43 and 49 are equal, the distance between the signal lines 47 and 44, the distance between the signal lines 49 and 45, the signal line The distance between 48 and 46 is also equal. Also, the distance between the signal lines 41 and 42, the distance between the signal lines 42 and 43, and the distance between the signal lines 43 and 41 are equal, and the distance between the signal lines 44 and 45, the signal lines 45 and 46, and the signal lines 46 and 44 are also equal.
[0024]
Therefore, the capacitance between the signal lines 47 and 41 is C _1A , the capacitance between the signal lines 48 and 42 is C _1B , the capacitance between the signal lines 49 and 43 is C _1C , and the signal lines 47 and 44. electrostatic capacity C _2A between, the electrostatic capacity C _2B between the signal lines 49 and 45, the electrostatic capacity C _2C between the signal lines 48 and 46, the capacitance between the signal line 41 and 42 C _1a1b , The capacitance between the signal lines 42 and 43 is C _1B1C , the capacitance between the signal lines 43 and 41 is C _1C1A , the capacitance between the signal lines 44 and 45 is C _2A2B , and between the signal lines 45 and 46. the electrostatic capacitance C _2B2C, if the capacitance between the signal line 46 and 44 and _{_{_{C 2C2A, C 1A = C 1B}}} = C 1C and C _2A = C _2B = C _2C and C _1A1B = C _1B1C = C _1C1A _{And C2A2B} = _C2B2C = _C2C2A .
[0025]
FIG. 8 is a schematic configuration diagram of a direct drive motor system centered on the resolver signal cable 40. In the figure, reference numeral 80 denotes a drive unit for detecting a position based on a resolver signal, and 90 denotes a motor unit including a resolver device. The excitation signal lines 401 converge into one in the drive unit 80, and are routed in the resolver signal cable 40 in a state where the excitation signal lines branch into three excitation signal lines 47, 48, and 49. Converged in the book. The excitation signal output from the excitation signal power supply 81 is transmitted to the excitation signal line 401 and supplied to the winding 91 of the resolver device. A resolver signal is output from the winding 91 of each phase via the detection signal lines 41 to 46, and is detected via the sense resistors R1 to R6.
[0026]
According to the present embodiment, there are merits (1) to (5) described above. By adopting the resolver signal cable of the present embodiment in a direct drive motor system, positioning accuracy is improved and stable, and vibration is reduced. A marked improvement can be achieved in terms of noise reduction.
[0027]
【The invention's effect】
According to the present invention, the electrostatic capacity unbalance between the excitation signal line and the detection signal line and the electrostatic capacity unbalance between the polyphase detection signal lines are eliminated, and the cable length is changed or the pole length is used. It is possible to provide a resolver signal cable whose signal performance is not affected.
[Brief description of the drawings]
FIG. 1 is a sectional view of a resolver signal cable according to a first embodiment.
FIG. 2 is a cross-sectional structure diagram of a resolver signal cable according to a second embodiment.
FIG. 3 is a cross-sectional structure diagram of a resolver signal cable according to a third embodiment.
FIG. 4 is a cross-sectional structure diagram of a resolver signal cable according to a fourth embodiment.
FIG. 5 is a schematic configuration diagram of a direct drive motor system according to the first embodiment.
FIG. 6 is a schematic configuration diagram of a direct drive motor system according to a second embodiment.
FIG. 7 is a schematic configuration diagram of a direct drive motor system according to a third embodiment.
FIG. 8 is a schematic configuration diagram of a direct drive motor system according to a fourth embodiment.
FIG. 9 is a cross-sectional structure diagram of a resolver signal cable according to a first conventional example.
FIG. 10 is a sectional structural view of a resolver signal cable in a second conventional example.
FIG. 11 is a sectional structural view of a resolver signal cable in a third conventional example.
[Explanation of symbols]
10, 20, 30, 40, 50, 60, 70 ... Resolver signal cables 11, 21, 31, 34, 41, 44 ... A phase detection signal lines 12, 22, 32, 35, 42, 45 ... B phase detection Signal lines 13, 23, 33, 36, 43, 46 ... C-phase detection signal lines 14, 24, 25, 26, 37, 47, 48, 49 ... excitation signal lines

Claims

A multi-core resolver in which at least one excitation signal line for supplying an excitation signal to the resolver device and a plurality of detection signal lines for transmitting a multiphase resolver signal output from the resolver device are arranged. In signal cables,
The excitation is performed such that the average value of the capacitance between each of the plurality of detection signal lines and the excitation signal line is approximately equal, and the average value of the capacitance between the detection signal lines of adjacent phases is approximately equal. Resolver signal cable with signal lines and detection signal lines.