JP3614109B2 - Combined current drive rotating electric machine - Google Patents

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である。すなわち、この場合は極対数が４で相数が３の回転電機と極対数が３で相数が４の回転電機とを複合する場合を示す。
【００４７】
図９は、上記の複合回転電機に適合する第１回転電機と第２回転電機のステータコイルの結線例を示す第１の回路図である。なお、図７におけるコイル番号（１．１）（１．２）（１．３）等と図９の同符号を付したコイルとは同じものを示す。
【００４８】
以下、図９に基づいて結線方法を説明する。
まず、第１回転電機５９のステータにおいて、１２個のコイルに、１から３の間で循環する相番号を任意のコイル（図９では一番上のコイル）から順に付与する。また、１２個のコイルを、相番号の異なる３個のコイルを１組含む４個のグループに分け、各グループに１から４までのグループ番号を付与する。図９では、各コイルのグループ番号と相番号を（グループ番号、相番号）で表記している。この場合にはグループ番号が１〜４、相番号が１〜３であるから、各コイルは次に４グループに分けられる。
第１グループ （１．１）（１．２）（１．３）
第２グループ （２．１）（２．２）（２．３）
第３グループ （３．１）（３．２）（３．３）
第４グループ （４．１）（４．２）（４．３）
そして同一グループに属する各コイルの終端（インバータに接続される端子ではない方）は相互に結線されている。すなわち、第１回転電機５９のステータコイルはＹ結線されている。
【００４９】
次に、第２回転電機６０のステータにおいて、１２個のコイルに、１から４の間で循環する相番号を任意のコイル（図９では一番上のコイル）から順に付与する。また、１２個のコイルを、相番号の異なる４個のコイルを１組含む３個のグループに分け、各グループに１から３までのグループ番号を付与する。図９では、各コイルのグループ番号と相番号を（グループ番号、相番号）で表記している。この場合にはグループ番号が１〜３、相番号が１〜４であるから、各コイルは次の３グループに分けられる。
第１グループ （１．１）（１．２）（１．３）（１．４）
第２グループ （２．１）（２．２）（２．３）（２．４）
第３グループ （３．１）（３．２）（３．３）（３．４）
そして同一グループに属する各コイルの終端（中立点）は互いに結線されている。すなわち、第２回転電機６０のステータコイルはＹ結線されている。
【００５０】
次に、図６に示した１２個の出力端子を有する１２相インバータの同一の端子に、第１回転電機５９のコイル（ｉ．ｊ）と第２回転電機６０のコイル（ｊ．ｉ）とを接続する。すなわち、
第１回転電機のコイル（１．１）の端子１と第２回転電機のコイル（１．１）の端子１とを１２相インバータの端子１に共通に接続
第１回転電機のコイル（１．２）の端子２と第２回転電機のコイル（２．１）の端子５とを１２相インバータの端子２に共通に接続
第１回転電機のコイル（１．３）の端子３と第２回転電機のコイル（３．１）の端子９とを１２相インバータの端子３に共通に接続
・
・
第１回転電機のコイル（４．３）の端子１２と第２回転電機のコイル（３．４）の端子１２とを１２相インバータの端子１２に共通に接続
なお、上記の結線は図７と同様である。
【００５１】
次に、上記のように結線した複合回転電機の電流制御について説明する。
まず、第１回転電機５９のみを駆動（Ｕ相、Ｖ相、Ｗ相による３相駆動）する場合には、第１回転電機５９の相番号が１であるコイルにＵ相、相番号が２であるコイルにＶ相、相番号が３であるコイルにＷ相の電流がそれぞれ流れるように１２相インバータによって各コイルの端子電圧を制御する。これにより、４個の極対を有する回転磁界が発生する。
このとき、第２回転電機６０のコイル端子にも電圧が印加されるが、グループ番号が１である第２回転電機のコイルの端子全てにＵ相の電圧が、グループ番号が２である第２回転電機のコイルの端子全てにＶ相の電圧が、グループ番号が３である第２回転電機のコイルの端子全てにＷ相の電圧がそれぞれ印加され、かつ、各グループ内のコイルの終端は相互に接続されているため、第２回転電機６０のコイルには電流が流れない。
【００５２】
次に、第２回転電機６０のみを駆動（Ａ相、Ｂ相、Ｃ相、Ｄ相による４相駆動）する場合には、第２回転電機６０の相番号が１であるコイルにＡ相、相番号が２であるコイルにＢ相、相番号が３であるコイルにＣ相、相番号が４であるコイルにＤ相の電流がそれぞれ流れるように１２相インバータによって各コイルの端子電圧を制御する。これにより、３個の極対を有する回転磁界が発生する。
このとき、第１回転電機５９のコイル端子にも電圧が印加されるが、グループ番号が１である第１回転電機５９のコイルの端子全てにＡ相の電圧が、グループ番号が２である第１回転電機５９のコイルの端子全てにＢ相の電圧が、グループ番号が３である第１回転電機５９のコイルの端子全てにＣ相の電圧が、グループ番号が４である第１回転電機５９のコイルの端子全てにＤ相の電圧がそれぞれ印加され、かつ、各グループ内のコイルの終端は相互に接続されているため、第１回転電機５９のコイルには電流が流れない。
【００５３】
次に、第１回転電機５９と第２回転電機６０とを同時に駆動する場合には、第１回転電機５９のコイル（１．１）にＵ相の電流が流れ、かつ、第２回転電機６０のコイル（１．１）にＡ相の電流が流れるような電圧が１２相インバータの端子１に出力されるようにする。このとき、１２相インバータの端子１にはＵ相電流とＡ相電流とが複合された複合電流が流れることになる。同様に、１２相インバータの端子２にはＶ相電流とＡ相電流との複合電流が流れ、１２相インバータの端子３にはＷ相電流とＡ相電流との複合電流が流れる。この場合も、第１回転電機５９のコイルにはＵ相、Ｖ相、Ｗ相の電流のみが流れ、第２回転電機６０のコイルにはＡ相、Ｂ相、Ｃ相、Ｄ相のみが流れる。
【００５４】
また、第１回転電機５９と第２回転電機６０に、上記のような電流を供給する電流制御装置は、前記図５と図６に示したような構成を有し、下記のような電流を供給する。すなわち、
相番号１に対応する各回転電機の制御電流をそれぞれの基準とした際に、
相番号ｊに対応する第１回転電機用の制御電流は基準に対して３６０度×（ｊ−１）／ｍ１だけ位相が異なる電流とし、
相番号ｉに対応する第２回転電機用の制御電流は基準に対して３６０度×（ｉ−１）／ｍ２だけ位相が異なる電流とし、
グループ番号がｉで相番号がｊである第１回転電機のステータコイルとグループ番号がｊで相番号がｉである第２回転電機のステータコイルとが接続された端子に、相番号ｊに対応する第１回転電機用の制御電流と相番号ｉに対応する第２回転電機用の制御電流とを複合して得られる複合電流が流れるように端子電圧を制御するものである。
【００５５】
上記のように本実施の形態の複合回転電機においては、それぞれの回転電機のロータ回転に同調する電流だけが各回転電機のステータコイルに流れるので、各ステータコイルで発生する銅損は各回転電機を専用のインバータで駆動した場合の銅損と同程度になる。また、インバータ内部には複合電流が流れており、このインバータ内部で発生する損失は、各回転電機を専用のインバータで駆動した場合に各インバータ内部で発生する損失の和より小さくなる。これは、各回転電機の制御電流の電流平均値を個別に算出して和を求めた値よりも各回転電機の制御電流を複合して得られる複合電流の電流平均値の方が小さくなることによる。
【００５６】
次に、図１０はステータコイルの結線を示す第２の回路図である。この回路図は図９に示した回路において、第１回転電機５９と第２回転電機６０のステータコイルの結線を△結線としたものであり、それ以外は図９と同じである。
【００５７】
次に、図１１はステータコイルの結線を示す第３の回路図である。
図１１において、第１回転電機５９においては、各グループ内に含まれるコイルの番号は図９と同様で、例えば第１グループは（１．１）（１．２）（１．３）であるが、この場合には、端子１のコイルが（１．１）、端子５のコイルが（１．２）、端子９のコイルが（１．３）になる。
同様に、第２回転電機６０においても、第１グループは端子１のコイルが（１．１）、端子１０のコイルが（１．２）、端子７のコイルが（１．３）、端子４のコイルが（１．４）になる。
【００５８】
図１１に示したように、定義した「グループ」は必ずしも隣接するコイルで構成されている必要はない。要は異なる相の電流を流すべきコイルがｋ１（ｋ２）個（この例では１個）づつ含まれるようにすればよい。
【００５９】
また、図１１の例では同一グループのコイルが１２０度づつ、あるいは９０度づつ離れているが、このような配置も必須ではない。このような配置は、４極対３相と３極対４相との組合せにおいて「自己の電流は流れ、相手方の電流が流れない」ことを完全に実現し、かつ、各回転電機のコイル端子の１と１、２と２、３と３、…、を接続することができるという一例である。
【００６０】
次に、図１２〜図１４は、結線方法を示す他の実施例における回路図であり、図１２はコントローラとドライバを示す回路図、図１３は９相インバータを示す回路図、図１４は９相インバータとステータコイルの結線を示す回路図である。図１２と図１３の回路はａ、ａ’、ｂ、ｂ’…、ｉ、ｉ’の同符号の部分で相互に接続されており、また、図１３と図１４の回路は１〜９の同符号の部分で相互に接続されている。なお、各回路の構成要素は前記図５〜図７と同様であり、相数が１２相から９相に代わった部分が異なる。
【００６１】
図１４において、

である。すなわち、この場合は極対数が３で相数が３の回転電機と極対数が３で相数が３の回転電機とを複合する場合を示す。
【００６２】
図１５は、上記の複合回転電機に適合する第１回転電機と第２回転電機の結線例を示す第１の回路図である。なお、図１４におけるコイル番号（１．１）（１．２）（１．３）等と図１５の同符号を付したコイルは同じものを示す。
【００６３】
以下、図１５に基づいて結線方法を説明する。
まず、第１回転電機５９において、９個のコイルに、１から３の間で循環する相番号を任意のコイル（図１５では一番上のコイル）から順に付与する。また、９個のコイルを、相番号の異なる３個のコイルを１組含む３個のグループに分け、各グループに１から３までのグループ番号を付与する。図１５では、各コイルのグループ番号と相番号を（グループ番号、相番号）で表記している。この場合にはグループ番号が１〜３、相番号が１〜３であるから、各コイルは次に３グループに分けられる。
第１グループ （１．１）（１．２）（１．３）
第２グループ （２．１）（２．２）（２．３）
第３グループ （３．１）（３．２）（３．３）
そして同一グループに属する各コイルの終端（インバータに接続される端子ではない方）は互いに結線されている。すなわち、第１回転電機５９のステータコイルはＹ結線されている。ただし、前記図１０と同様に△結線も可能である。
【００６４】
同様に第２回転電機６０においても９個のコイルを第１〜第３グループに分ける。この場合にも同一グループに属する各コイルの終端（インバータに接続される端子ではない方）は互いに結線されており、第２回転電機６０のステータコイルはＹ結線されている。ただし、前記同様に△結線も可能である。
【００６５】
次に、９個の出力端子を有する９相インバータの同一の端子に、第１回転電機５９のコイル（ｉ．ｊ）と第２回転電機６０のコイル（ｊ．ｉ）とを接続する。 すなわち、
第１回転電機５９のコイル（１．１）の端子１と第２回転電機６０のコイル（１．１）の端子１とを９相インバータの端子３に共通に接続
第１回転電機５９のコイル（１．２）の端子２と第２回転電機６０のコイル（２．１）の端子４とを９相インバータの端子２に共通に接続
第１回転電機５９のコイル（１．３）の端子３と第２回転電機６０のコイル（３．１）の端子７とを９相インバータの端子１に共通に接続
・
・
第１回転電機のコイル（３．３）の端子９と第２回転電機のコイル（３．３）の端子９とを９相インバータの端子７に共通に接続
なお、上記の結線は図１４と同様である。
【００６６】
次に、上記のように結線した複合回転電機の電流制御について説明する。
まず、第１回転電機５９のみを駆動（ｕ相、ｖ相、ｗ相による３相駆動）する場合には、第１回転電機５９の相番号が１であるコイルにｗ相、相番号が２であるコイルにｖ相、相番号が３であるコイルにｕ相の電流がそれぞれ流れるように９相インバータによって各コイルの端子電圧を制御する。これにより、３個の極対を有する回転磁界が発生する。
このとき、第２回転電機６０のコイルの端子にも電圧が印加されるが、グループ番号が１である第２回転電機６０のコイルの端子全てにｗ相の電圧が、グループ番号が２である第２回転電機６０のコイルの端子全てにｖ相の電圧が、グループ番号が３である第２回転電機６０のコイルの端子全てにｕ相の電圧がそれぞれ印加され、かつ、同一グループ内の各コイルの他端は相互に接続されているため、第２回転電機６０のコイルには電流が流れない。
【００６７】
次に、第２回転電機６０のみを駆動（Ｕ相、Ｖ相、Ｗ相による３相駆動）する場合には、第２回転電機６０の相番号が１であるコイルにＵ相、相番号が２であるコイルにＶ相、相番号が３であるコイルにＷ相の電流がそれぞれ流れるように９相インバータによって各コイルの端子電圧を制御する。これにより、３個の極対を有する回転磁界が発生する。
このとき、第１回転電機５９のコイルの端子にも電圧が印加されるが、グループ番号が１である第１回転電機５９のコイルの端子全てにＵ相の電圧が、グループ番号が２である第１回転電機５９のコイルの端子全てにＶ相の電圧が、グループ番号が３である第１回転電機５９のコイルの端子全てにＷ相の電圧がそれぞれ印加され、かつ、同一グループ内の各コイルの他端は相互に接続されているため、第１回転電機５９のコイルには電流が流れない。
【００６８】
次に、第１回転電機５９と第２回転電機６０とを同時に駆動する場合には、第１回転電機５９のコイル（１．３）にｕ相の電流が流れ、かつ、第２回転電機６０のコイル（３．１）にＵ相の電流が流れるような電圧が９相インバータの端子１に出力されるようにする。このとき、９相インバータの端子１にはｕ相電流とＵ相電流とが複合された複合電流が流れることになる。同様に、９相インバータの端子２にはｖ相電流とＶ相電流との複合電流が流れ、９相インバータの端子３にはｗ相電流とＷ相電流との複合電流が流れる。この場合も、第１回転電機５９のコイルにはｕ相、ｖ相、ｗ相の電流のみが流れ、第２回転電機６０のコイルにはＵ相、Ｖ相、Ｗ相のみが流れる。
【００６９】
また、第１回転電機５９と第２回転電機６０に、上記のような電流を供給する電流制御装置は、前記図１２と図１３に示したような構成を有し、下記のような電流を供給する。すなわち、
相番号１に対応する各回転電機の制御電流をそれぞれの基準とした際に、
相番号ｊに対応する第１回転電機用の制御電流は基準に対して３６０度×（ｊ−１）／ｍ１だけ位相が異なる電流とし、
相番号ｉに対応する第２回転電機用の制御電流は基準に対して３６０度×（ｉ−１）／ｍ２だけ位相が異なる電流とし、
グループ番号がｉで相番号がｊである第１回転電機のステータコイルとグループ番号がｊで相番号がｉである第２回転電機のステータコイルとが接続された端子に、相番号ｊに対応する第１回転電機用の制御電流と相番号ｉに対応する第２回転電機用の制御電流とを複合して得られる複合電流が流れるように端子電圧を制御するものである。
この実施の形態においては、複合回転電機を構成する２つの回転電機におけるロータ極対数が同じなっているが、このような構成でも本発明を適用することが可能である。
【００７０】
次に、図１６は、ステータコイルの結線を示す他の回路図である。
図１６において、

である。すなわち、この場合は極対数が６で相数が３の回転電機と極対数が３で相数が３の回転電機とを複合する場合を示す。
【００７１】
以下、図１６に基づいて結線方法を説明する。
まず、第１回転電機５９では、１８個のコイルに、１から３の間で循環する相番号を任意のコイル（図１６では一番上のコイル）から順に付与する。そして１８個のコイルを、相番号の異なる３個のコイルを２組含む３個のグループに分け、各グループに１から３までのグループ番号を付与する。そして同一グループ内で相番号が等しい２つのコイルを接続する。また、各グループ内のコイルの終端は相互に接続する。したがってこの回路はＹ結線となる。ただし、前記と同様に△結線も可能である。
【００７２】
また、第２回転電機６０においては、９個のコイルに、１から３の間で循環する相番号を任意のコイル（図１６では一番上のコイル）から順に付与する。そして９個のコイルを、相番号の異なる３個のコイルを１組含む３個のグループに分け、各グループに１から３までのグループ番号を付与する。また、各グループ内のコイルの終端は相互に接続する。したがってこの回路はＹ結線となる。ただし、前記と同様に△結線も可能である。
【００７３】
次に、９個の出力端子を有する９相インバータの同一の端子に、第１回転電機のコイル（ｉ．ｊ）と第２回転電機のコイル（ｊ．１）とを接続する。
すなわち、
第１回転電機５９の２つのコイル（１．１）の端子１と第２回転電機６０のコイル（１．１）の端子１とを９相インバータの端子３に共通に接続
第１回転電機５９の２つのコイル（１．２）の端子２と第２回転電機６０のコイル（２．１）の端子４とを９相インバータの端子２に共通に接続
第１回転電機５９の２つのコイル（１、３）の端子３と第２回転電機６０のコイル（３．１）の端子７とを９相インバータの端子１に共通に接続
・
・
第１回転電機５９の２つのコイル（３．３）の端子９と第２回転電機６０のコイル（３．３）の端子９とを９相インバータの端子７に共通に接続する。
【００７４】
なお、図１６の回路における電流制御は、図１５の説明と同様である。ただし、第１回転電機５９では６個の極対を有する回転磁界が発生する。
【００７５】
これまで説明してきた接続方法を纏めると下記のようになる。すなわち、
極対数がＰ１であるロータと、集中巻されたｓ１個のステータコイルとを備え、相数ｍ１の交流電流によって駆動される第１回転電機と、
極対数がＰ２であるロータと、集中巻されたｓ２個のステータコイルとを備え、相数ｍ２の交流電流によって駆動される第２回転電機と、からなる複合回転電機であって、
第１回転電機と第２回転電機との間には、
ｓ１＝Ｐ１×ｍ１、ｓ２＝Ｐ２×ｍ２
Ｐ１＝ｋ１×ｍ２、Ｐ２＝ｋ２×ｍ１ ただしｋ１、ｋ２は自然数
ｐ１＝Ｐ１／ｋ１、ｐ２＝Ｐ２／ｋ２としたとき、
ｐ１×ｍ１＝ｐ２×ｍ２
の関係が成立し、
第１回転電機のｓ１個のステータコイルに、１からｍ１の間で循環する相番号を任意のステータコイルから順に付与し、かつ、ｓ１個のステータコイルを、相番号の異なるｍ１個のステータコイルをｋ１組含むｐ１個のグループにグループ分けし、各グループに１からｐ１までのグループ番号を付与し、
第２回転電機のｓ２個のステータコイルに、１からｍ２の間で循環する相番号を任意のステータコイルから順に付与し、かつ、ｓ２個のステータコイルを、相番号の異なるｍ２個のステータコイルをｋ２組含むｐ２個のグループにグループ分けし、各グループに１からｐ２までのグループ番号を付与した場合に、
各グループに属するステータコイルをＹ結線またはΔ結線によって相互に接続し、かつ、グループ番号がｉで相番号がｊである第１回転電機のステータコイルの一端とグループ番号がｊで相番号がｉである第２回転電機のステータコイルの一端とを接続する。
【図面の簡単な説明】
【図１】本発明の一実施例の全体構成を示すブロック図。
【図２】図１における多相インバータ複合電流コントローラ１６の一例を示すブロック図。
【図３】本発明の他の実施例を示すブロック図。
【図４】図３のより具体的な実施例を示すブロック図。
【図５】本発明を適用する回転電機におけるコントローラとドライバの一例を示す回路図。
【図６】本発明を適用する回転電機における１２相インバータに一例を示す回路図。
【図７】本発明を適用する回転電機におけるインバータとステータコイルとの結線を示す回路図。
【図８】ドライバの１相分を示す回路図。
【図９】本発明を適用する回転電機におけるステータコイルの結線方法を示す第１の回路図。
【図１０】本発明を適用する回転電機におけるステータコイルの結線方法を示す第２の回路図。
【図１１】本発明を適用する回転電機におけるステータコイルの結線方法を示す第３の回路図。
【図１２】本発明を適用する回転電機におけるコントローラとドライバの他の例を示す回路図。
【図１３】本発明を適用する回転電機における９相インバータの他の例を示す回路図。
【図１４】本発明を適用する回転電機におけるインバータとステータコイルとの結線方法の他の例を示す回路図。
【図１５】本発明を適用する回転電機におけるステータコイルの結線方法を示す他の例における第１の回路図。
【図１６】本発明を適用する回転電機におけるステータコイルの結線方法を示す他の例における第２の回路図。
【符号の説明】
１…原動機 ２…入力軸
３…第１ロータ ４…第１ステータ
５…第２ロータ ６…第２ステータ
７…スリップリング ８…出力軸
９…第１エンコーダ １０…第２エンコーダ
１１…多相インバータ １２…電流センサ
１３…電圧センサ １４…直流電源
１５…ＤＣリンクコンデンサ
１６…多相インバータ複合電流コントローラ
１７…上位コントローラ ２０…目標トルク演算部
２１…第１目標電流演算部 ２２…第２目標電流演算部
２３…電流分離演算部 ２４…電流変換演算部
２５…第１目標電圧演算部 ２６…第２目標電圧演算部
２７…複合電圧生成部 ２８…正規化および補正部
２９…第１変換部 ３０…第２変換部
３１…加算部 ３２…切換部
３３…最小電流相演算部 ３４…第２ステータ通電極探索部
３５…電流分離演算部 ３６…目標電流演算部
３７…電流変換演算部 ３８…目標電圧演算部
３９…分配演算部 ４０…電流判断部
５０…コントローラ ５１…ドライバ
５２…信号源 ５３…加算器
５４…サンプルホールド回路 ５５…三角波発振器
５６…直流電源 ５７…コンデンサ
５８…スイッチング回路 ５９…第１回転電機
６０…第２回転電機 ６１…比較器
６２…インバータ
Ｓ１、Ｓ２…トルク指令信号 Ｓ３、Ｓ４…位相信号
Ｌ…ステータコイル Ｚ…インピーダンス
ａ、ｂ、ｃ、ｄ…中立点 Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆ…中立点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite current drive rotating electrical machine, and more particularly to a technique for reducing the loss of an inverter for supplying drive power.
[0002]
[Prior art]
As an apparatus for transmitting power using a plurality of electromagnetically coupled rotating mechanisms, there is an apparatus described in, for example, Japanese Patent Laid-Open No. 9-46965.
[0003]
[Problems to be solved by the invention]
However, in such a conventional power transmission device, since power is supplied to the power generation and drive rotation mechanisms by respective dedicated inverters, all of the power generated or driven passes through the inverter. ing. For this reason, there is a problem that the loss generated in the inverter inevitably increases, and accordingly, the inverter cooling device is also increased in size.
[0004]
The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a composite current drive rotating electrical machine capable of reducing inverter loss.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as described in the claims. That is, in claim 1, the input shaft mechanically coupled to the prime mover, the first rotor mechanically coupled to the input shaft, and the first rotor coupled electromagnetically to the first rotor. A first stator mechanically coupled to the output shaft, a second rotor mechanically coupled to the output shaft, and electromagnetically coupled to the second rotor. In a composite type rotating electrical machine including a second stator coupled and fixed to the outside, a composite current is supplied from a common multiphase inverter to the coil of the first stator and the coil of the second stator. Thus, torque and power are exchanged between the first rotating electrical machine composed of the first rotor and the first stator and the second rotating electrical machine composed of the second rotor and the second stator. And connecting the first stator coil and the second stator coil to the connection according to claim 1. doing. As described above, in claim 1, by supplying the generated current and the drive current as a composite current from a common inverter, the loss generated inside the inverter is reduced when each rotary electric machine is driven by a dedicated inverter. Since it becomes smaller than the sum of the loss generated inside the inverter, the loss in the inverter can be reduced.
[0006]
Also The second Connection of 1 stator coil and 2nd stator coil Subcontract Claim 1 When the composite current is supplied by connecting the coils of the first stator and the second stator in parallel by connecting as described in the above, the necessary current is separately supplied to each coil. I can do it.
[0007]
Claims 2 The multi-phase inverter supplies the sum of the current to be supplied to the first stator coil and the current to be supplied to the second stator coil.
[0008]
Claims 3 In the configuration, the distribution of the current supplied to the coil of the second stator is determined for each pole pair of the second stator in accordance with the value of the current supplied to the coil of the first stator.
[0009]
Claims 4 In this case, when the arbitrary phase current supplied to the coil of the first stator approaches the allowable current value of the power device forming the multi-phase inverter, the phase is selectively transferred to the second stator. It is comprised so that an electric current may be sent.
[0010]
【The invention's effect】
According to the first aspect of the present invention, the loss that occurs inside the common inverter that supplies the composite current to the two rotating electrical machines is smaller than the sum of the losses that occur inside each inverter when each rotating electrical machine is driven by a dedicated inverter. Therefore, loss in the inverter can be reduced, and transmission efficiency can be further improved. Moreover, since the loss in the inverter can be reduced, the heat generated in the power device can also be reduced, so that the cooling device can be downsized. Further, since the inverter is multi-phased, effects such as being able to rotate in the remaining phase even if any one of the arms is broken can be obtained.
[0011]
Claims 1 By connecting as described in the above, the current to the coils of the first stator and the second stator can be naturally distributed simply by supplying a composite current from the inverter. Ineffective currents when connected in parallel can be suppressed and overall efficiency can be improved.
Claims 2 In the above, by setting the sum of effective currents of the first stator coil and the second stator coil, a predetermined torque can be obtained without passing an unnecessary current.
Claims 3 , Claims 4 In this case, the current supplied to the power device of the inverter can be made uniform.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram (partially a schematic sectional view) showing the overall configuration of an embodiment of the present invention.
1 includes an input shaft 2 for transmitting an output torque of a prime mover 1 (for example, an internal combustion engine), a first rotor 3 mechanically coupled to the input shaft 2, a first rotor 3 A first stator 4 electromagnetically coupled to the first rotor 3, rotatable relative to the first rotor 3, and mechanically coupled to the output shaft 8; and mechanically coupled to the output shaft 8. The coupled second rotor 5, the second stator 6 electromagnetically coupled to the second rotor 5 and fixed to the outside (for example, the outer frame), and a slip for supplying power to the coil of the first stator 4 A ring 7 and an output shaft 8 for transmitting the output torque of the first stator 4 and the second rotor 5 to the outside are provided. The first rotor 3 and the first stator 4 constitute a first rotating electric machine, and the second rotor 5 and the second stator 6 constitute a second rotating electric machine. The coils of the first stator 4 and the second stator 6 are connected in parallel to each other and connected to a common multiphase inverter 11. Details of the method of connecting the coils of the first stator 4 and the second stator 6 will be described later. Further, the rotation of the first encoder 9 and the second rotor 5 (hence the first stator 4 and the output shaft 8) for detecting the rotation angle and the rotation speed (rotation speed) of the first rotor 3 (hence, the prime mover 1 and the input shaft 2). A second encoder 10 for detecting the angle and the number of rotations (rotation speed) is provided.
[0013]
The multiphase inverter 11 includes a DC power supply 14, a DC link capacitor 15, and a power device. The power device is a circuit in which two parallel circuits of a transistor and a diode are connected in series and connected in parallel by the number of phases, and a gate signal having an antiphase is applied to the two transistors in each phase. For this reason, when one transistor is on, the other is off, and a current flows through the phase in which the + side transistor of the DC power supply 14 is on. The output current of the multiphase inverter 11 is detected by the current sensor 12. In the case of three-phase alternating current, a total of four current sensors are provided for two phases for each of the first rotating electrical machine and the second rotating electrical machine. The voltage of the DC power supply 14 is detected by the voltage sensor 13.
[0014]
The signals of the first encoder 9, the second encoder 10, the current sensor 12 and the voltage sensor 13 are sent to the multiphase inverter composite current controller 16. The host controller 17 is, for example, a basic controller for vehicle control, and generates a necessary target output torque signal (and prime mover target rotational speed) from the operation amount of the accelerator pedal, the vehicle speed, and the like, and sends the target output torque signal to the multiphase inverter composite current controller 16. The multiphase inverter composite current controller 16 calculates a gate signal for controlling the composite current drive rotating electrical machine based on the various input signals as described above, and sends it to the multiphase inverter 11.
[0015]
Next, the operation of the apparatus shown in FIG. 1 will be described.
Due to the input torque from the prime mover 1, the first rotor 3 mechanically connected thereto rotates. At this time, a three-phase current having a frequency that is the difference between the rotational speed of the first rotor 3 (that is, the rotational speed of the input shaft 2) and the rotational speed of the output shaft 8 is passed through the first stator 4 heslip ring 7. As a result, it is possible to generate torque on the output shaft 8 in the opposite direction to the torque of the first rotor 3 and having the same magnitude. At this time, the first rotor 3 can generate and drive electric power through the stator 4 according to the torque generated in the prime mover 1, the rotation speed of the first rotor 3, and the rotation speed of the output shaft 8. in this way,
Number of rotations of first rotor 3 (number of rotations of input shaft 2)> number of rotations of output shaft 8
If so, a part of the generated energy of the prime mover 1 can be regenerated by applying a current having a frequency difference between the two. At this time, torque assist can be performed by applying a three-phase current to the coil of the second stator 6 using the regenerative energy. The second rotor 5 is in a power running state (a state in which the outside is driven) and releases energy from the multiphase inverter 11. The loss that occurs in the common inverter that supplies the composite current to the two rotating electrical machines is smaller than the sum of the losses that occur in each inverter when each rotating electrical machine is driven by a dedicated inverter. The transmission efficiency can be further improved.
[0016]
Hereinafter, the details of the multiphase inverter composite current controller 16 will be described. FIG. 2 is a block diagram showing an example of the multiphase inverter composite current controller 16.
In FIG. 2, among the signals input to the multiphase inverter composite current controller 16, the first rotor rotational speed (actual value) and the first rotor rotational angle are signals from the first encoder 9. Similarly, the second rotor rotation speed and the second rotor rotation angle are signals from the second encoder 10. The prime mover target rotational speed and the target output torque are signals from the host controller 17. The phase current is a signal from the current sensor 12, and the voltage of the DC power supply 14 is a signal from the voltage sensor 13.
[0017]
First, the target torque calculator 20 calculates the first rotor target torque using the prime mover target rotational speed and the first rotor rotational speed. Next, the first target current calculation unit 21 calculates a target d-axis current (1) and a target q-axis current (2) for the first stator from the first rotor target torque. At this time, the first target current calculation unit 21 uses a differential rotational speed between the first rotor rotational speed and the second rotor rotational speed.
[0018]
Next, the second target current calculation unit 22 determines the target torque of the second rotor by taking the difference between the target output torque and the first rotor target torque, and uses that and the second rotor rotational speed to determine the second target current torque. The target d-axis current (3) and the target q-axis current (4) for the two stators are calculated. Further, the current separation calculation unit 23 separates the two components of the first stator current and the second stator current from the detected total phase current.
[0019]
Next, the current conversion calculation unit 24 determines the relative position of the first stator phase current detected by the current separation calculation unit 23 by using the rotational speed difference between the first rotor and the second rotor. Conversion into d-axis current and q-axis current for the first stator. Similarly, the second stator phase current detected by the current separation calculation unit 23 is used to determine the rotor position (angle) using the second rotor rotational speed (angle), so that the d-axis current q for the second stator, q Convert to shaft current.
[0020]
Next, in the first target voltage calculation unit 25, the target d-axis current (1) and the target q-axis current (2) for the first stator obtained by the first target current calculation unit (21) and the current conversion calculation unit (24) A target d-axis voltage and a target q-axis voltage for the first stator are calculated from the obtained actual d-axis current and q-axis current for the first stator. Similarly, the second target voltage calculation unit 26 uses the target d-axis current (3) and the target q-axis current (4) for the second stator obtained by the second target current calculation unit 22 and the current conversion calculation unit 24. A target d-axis voltage and a target q-axis voltage for the second stator are calculated from the obtained actual d-axis current and q-axis current for the second stator.
[0021]
Next, the composite voltage generating unit 27 converts the target d-axis voltage and the target q-axis voltage for the first stator into a three-phase voltage, and the target d-axis voltage and the target q-axis for the second stator. A second converter 30 for converting the voltage into a three-phase voltage and an adder 31 for obtaining the sum of the two, and using the first rotor rotation angle and the second rotor rotation angle, the target d-axis voltage for both stators and After the target q-axis voltage is converted into a three-phase voltage, a composite voltage target value is generated by obtaining the sum thereof.
[0022]
Next, the normalization and correction unit 28 normalizes the composite voltage target value using the voltage of the DC power supply 14, adds dead time compensation, and generates a PWM modulated signal. By modulating this PWM modulated signal with a carrier signal (for example, a triangular wave signal), a PWM gate signal for driving the multiphase inverter 11 is output.
[0023]
By opening and closing the power device (switching element) of the multi-phase inverter 11 using the gate signal generated as described above, each coil of the first stator 4 and the second stator 6 connected in parallel to each other, Each can supply a necessary current (details will be described later).
[0024]
FIG. 3 is a block diagram showing another embodiment of the present invention. FIG. 3 shows a part added to the circuit shown in FIG. 2, and the part of FIG. 2 shows only the composite voltage generation unit 27.
[0025]
In the present invention, a composite current is supplied from the common multiphase inverter 11 to the coils of the first stator 4 and the second stator 6 connected in parallel. Therefore, when the current to be supplied to both the first stator 4 and the second stator 6 for a certain phase among the three phases becomes large, the load on the power device element of the multiphase inverter 11 becomes unbalanced. For example, when the difference between the rotation speed of the first rotor 3 and the rotation speed of the second rotor 5 (hereinafter referred to as slip rotation speed) is small and the generated torque of the prime mover 1 is large, a low-frequency large current is One coil of the stator 4 is energized. Thus, when a large current flows through the first stator 4, the distribution of the current supplied to the coil of the second stator 6 is distributed according to the current value supplied to the coil of the first stator 4. By determining for each pole pair, the current supplied to the power device of the multiphase inverter 11 can be made uniform.
[0026]
In FIG. 3, the minimum current phase calculation unit 33 compares the actual U-phase, V-phase, and W-phase currents of the first stator to obtain three pole pairs (details will be described later in the case of a rotating electric machine having three pole pairs). Among them, a pole having a small current value is detected. Then, the second stator through electrode searching unit 34 searches for the pole having a small current value as a pole capable of flowing a large current to the second stator. As described above, a large current is allowed to flow only to the second stator in the phase where the current flowing through the first stator 4 is small.
[0027]
First, the current separation calculation unit 35 separates the component of the second stator current from the detected total phase current. Next, the target current calculation unit 36 calculates a target d-axis current and a target q-axis current for the second stator using the second stator current value and the second rotor rotational speed.
[0028]
Further, the current conversion calculation unit 37 calculates a target d-axis current and a target q-axis current per pole pair using the torque command value for the second rotor and the second rotor rotational speed. The target voltage calculation unit 38 calculates the target d-axis current and target q-axis current for the second stator obtained by the target current calculation unit 36 and the target d-axis current and target q-axis current obtained by the current conversion calculation unit 37. A target d-axis voltage and a target q-axis voltage for the second stator are calculated.
[0029]
In the distribution calculation unit 39, the target d-axis voltage and the target q-axis voltage for the second stator are converted into a three-phase voltage, and then the value and a pole through which a large current obtained by the second stator through-electrode search unit 34 can flow. Accordingly, the amount of current to be supplied to the coil of the second stator is distributed. For example, as shown in the output of the distribution calculation unit 39 in FIG. 3, the target voltage is set to a small value (for example, 0) for two poles with a large current flowing through the first stator, and the one pole with a small current flowing through the first stator is set. Increase the target voltage. In addition, the correction | amendment about the pole which energizes said large electric current can consider the correction which multiplies the calculated electric current value by an integer, for example.
[0030]
The target voltage is switched to the three-phase voltage for the second stator sent from the second conversion unit 30 in FIG. 2 via the switching unit 32 provided in the composite voltage generation unit 27, and 3 for the first stator. A composite voltage target value is generated by calculating the sum with the phase voltage. Note that the switching unit 32 is configured to switch by a switching signal corresponding to the magnitude of the first stator current or the like, for example, to select the corrected target voltage when the first stator current is greater than or equal to a predetermined value.
[0031]
As described above, instead of the target voltage for the normal second stator, by using the target voltage obtained by performing a large current distribution for the phase with a small first stator current, the current that is passed through the power device of the multiphase inverter 11 Can be made uniform.
[0032]
Next, FIG. 4 is a more specific embodiment of the circuit shown in FIG. 3, and an allowable current of a power device in which an arbitrary phase current supplied to the coil of the first stator 4 forms the multiphase inverter 11. In this example, the current to the second stator is selectively passed to a phase other than the phase when approaching the value.
In this case, the current sensor 12 in FIG. 1 detects current for each of nine phases (three phases × 3).
[0033]
When the first stator 4 is energized with a low frequency and a large current, if the current of one phase is small due to the three-phase alternating current, a large current flows for a relatively long time for the other two phases. Therefore, if a large current is supplied to the first stator 4 for the two phases and a large current is supplied to the second stator 6 for the remaining one phase, the current imbalance as a whole of the multiphase inverter 11 is reduced. It can be solved.
[0034]
In FIG. 4, the current determination unit 40 obtains the difference between the actual current value of the first stator 4 and the allowable current of the power device of the multiphase inverter 11 for each of the nine phases of the composite current, and this value is a predetermined value. Is smaller, that is, when the allowable current of the power device is likely to be saturated only by the current flowing through the first stator 4, the allowable current is likely to be saturated by switching the switching unit 32 provided in the composite voltage generating unit 27. For the short phase, the current supplied to the second stator 6 is stopped. A large current is supplied to the second stator 6 only for the phase where the current of the first stator 4 is small.
[0035]
The calculation of the current value is the same as in FIG. 3, and the target d-axis current and the target q-axis current per pole pair are calculated from the torque command value to the second rotor, and the actual d-axis current and q-axis current are calculated. Generate a target voltage. As a result, power is supplied to the first stator 4 for 6 phases of the multiphase inverter 11 (in this case, 9 phases), and the second stator is supplied for 3 phases (phase where the current of the first stator 4 is small). Supply power to 6.
[0036]
Next, one phase is energized to the first stator 4, and if this is large, half of the current is energized for the remaining two phases, so that the second stator 6 receives a current corresponding to two pole pairs. Energize. First, the d-axis current and q-axis current that can be generated by the above-mentioned one-pole pair are calculated, and the target d-axis current and the target q-axis current are calculated as a two-pole pair motor so that no more torque is generated even in the two-pole pair. To do. After that, the target d-axis voltage and the target q-axis voltage are generated from the actual d-axis current and q-axis current. At this time, power is supplied to the first stator 4 for three phases of the nine-phase inverter, and power is supplied to the second stator 6 for six phases.
[0037]
Next, a method of connecting the coils of the first stator 4 and the second stator 6 in FIG. 1 will be described in detail.
An example of a composite type rotating electric machine is described in Japanese Patent Application Laid-Open No. 11-275826 filed previously by the present applicant. The arrangement of rotor magnetic poles and stator coils in the rotating electrical machine of the present invention is basically the same as that in the above document. Further, in Japanese Patent Application No. 11-351613 and Japanese Patent Application No. 2000-358004 (both of which have not been disclosed) previously filed by the present applicant, a composite rotary electric machine having a stator coil and a rotor independently, and two rotors. And a stator opposed to each rotor, and a coil provided in each stator has a current in a phase correlated with its own rotor, and the other is in a phase in which no current flows in the same phase. By connecting each phase of the stator coil in parallel to the corresponding phase of the inverter and supplying a composite current from the inverter to control both rotors independently, the coils of the same polarity in the two stator coils Describes a rotating electric machine that suppresses an invalid current when each is connected in parallel to improve overall efficiency.
[0038]
In the above rotating electrical machine, when one rotor is operated as a motor and the other as a generator, the current corresponding to the difference between the motor driving power and the generated power only needs to flow through a common coil. Can be improved. Further, when one inverter is sufficient for the two stator coils, and when one of the rotors is operated as a motor and the remaining as a generator, the difference between the motor driving power and the generated power is calculated as described above. Therefore, the capacitance of the power switching transistor of the inverter can be reduced, thereby improving the switching efficiency and further improving the overall efficiency. However, when the stator coils of two rotating electric machines are simply connected in parallel to the output of the inverter, the current for driving one rotor also flows through the other stator coil. Since this current has no correlation with the rotation of the rotor, it does not contribute to the generation of the driving force of the rotating electrical machine. When such an invalid current flows, losses such as copper loss occur, so that the efficiency of the entire rotating electrical machine is reduced and adverse effects such as an increase in heat generation occur. The above prior application solves the above problem by changing the connection of the neutral points, and the connection method between the two stators and the polyphase inverter in the present invention is basically based on the same consideration as described above. .
[0039]
Details will be described below.
5 to 8 are circuit diagrams for explaining a connection method according to the present invention, in which FIG. 5 is a circuit diagram showing a controller and a driver, FIG. 6 is a circuit diagram showing a 12-phase inverter, and FIG. 7 is a 12-phase inverter. And FIG. 8 is a circuit diagram showing one phase of the driver. The circuits of FIGS. 5 and 6 are connected to each other at the same reference numerals a, a ′, b, b ′..., L, l ′, and the circuits of FIGS. They are connected to each other at the same reference numerals. 5 corresponds to a part of the multiphase inverter composite current controller 16 of FIG. 1, and FIG. 6 corresponds to the multiphase inverter 11 of FIG.
[0040]
In FIG. 5, 50 is a controller and 51 is a driver. The controller 50 includes a signal source 52, an adder 53 (symbol surrounded by Σ), and a sample hold circuit 54. The signal sources 52 correspond to the outputs of the first converter 29 and the second converter 30 in FIG. 2, respectively, and the adders 53 correspond to the adder 31 in FIG.
[0041]
As described above, the signal source 52 indicates the voltage command value of each phase, and the voltage command values VU, VV, VW, VA, VB, VC, VD in each phase of U, V, W, A, B, C, D. Is as follows.
VU = V1sin (θ1)
VV = V1sin (θ1-120 °)
VW = V1sin (θ1-240 °)
VA = V2sin (θ2)
VB = V2sin (θ2-90 °)
VC = V2sin (θ2-180 °)
VD = V2sin (θ2-270 °)
However, θ is determined by the rotation angle (rotor rotation angle) of each rotating electrical machine. The unit of V1 and V2 is%, which is a modulation rate in so-called PWM control.
[0042]
The adder 53 adds U, V, W and A, B, C, D voltage command values, respectively, and outputs the result.
The sample hold circuit 54 samples and holds the output of each adder 53 and outputs it. The sample hold circuit 54 is necessary for digital control, but is not necessary for analog control.
[0043]
Next, as shown in FIG. 8, the driver 51 compares the output of the sample hold circuit 54 or the adder 53 (in the case of analog control) with the triangular wave signal (carrier signal) from the triangular wave oscillator 55. A comparator 61 that outputs a PWM signal and an inverter 62 that inverts and outputs the PWM signal are provided, and such a circuit is provided for the number of phases (in this case, 12 phases). The output of the comparator 61 for each phase is the positive phase signal a, b,..., L, and the output (inverted signal) of the inverter 62 for each phase is a ′, b ′,.
[0044]
Next, the multiphase inverter shown in FIG. 6 includes a DC power supply 56, a capacitor 57, and two switching circuits 58 for each phase. The switching circuit 58 is composed of a parallel circuit of a transistor and a diode. In each phase, two switching circuits are connected in series, the positive phase signal (a, b,..., L) of the driver 51 is given to one gate terminal, and the inverted signal (a ', B', ..., l '). Therefore, when one of the two switching circuits is turned on, the other is turned off, and a current flows in a phase in which the switching circuit close to the + side of the DC power supply 56 is turned on. 6 at the right end of FIG. 6 indicate output terminals of respective phases.
[0045]
Next, FIG. 7 is a diagram showing the connection between the inverter and the stator coil in the two rotating electric machines. One rotating electric machine is a first rotating electric machine 59 (a rotation composed of the first rotor 3 and the first stator 4 in FIG. The other rotating electrical machine is referred to as a second rotating electrical machine 60 (corresponding to a rotating electrical machine including the third rotor 5 and the second stator 6 in FIG. 1). The number of pole pairs means the number of magnetic pole pairs (one pair of N and S) provided on the rotor. The number of electrical poles of the coil is a product value of the number of phases of the drive current and the number of pole pairs, and corresponds to the number of stator coils.
[0046]
In FIG.

It is. In other words, in this case, a rotating electric machine having four pole pairs and three phases and a rotating electric machine having three pole pairs and four phases are combined.
[0047]
FIG. 9 is a first circuit diagram illustrating a connection example of stator coils of the first rotating electric machine and the second rotating electric machine that are suitable for the above composite rotating electric machine. In addition, the coil numbers (1.1), (1.2), (1.3), etc. in FIG.
[0048]
Hereinafter, the connection method will be described with reference to FIG.
First, in the stator of the first rotating electrical machine 59, phase numbers that circulate between 1 and 3 are sequentially given to 12 coils from an arbitrary coil (the top coil in FIG. 9). Further, the 12 coils are divided into 4 groups including one set of 3 coils having different phase numbers, and group numbers 1 to 4 are assigned to each group. In FIG. 9, the group number and phase number of each coil are represented by (group number, phase number). In this case, since the group numbers are 1 to 4 and the phase numbers are 1 to 3, the coils are then divided into 4 groups.
First group (1.1) (1.2) (1.3)
Second group (2.1) (2.2) (2.3)
Third group (3.1) (3.2) (3.3)
4th group (4.1) (4.2) (4.3)
And the termination | terminus (one which is not a terminal connected to an inverter) of each coil which belongs to the same group is connected mutually. That is, the stator coil of the first rotating electrical machine 59 is Y-connected.
[0049]
Next, in the stator of the second rotating electrical machine 60, phase numbers that circulate between 1 and 4 are sequentially given to the 12 coils from the arbitrary coil (the top coil in FIG. 9). Further, the 12 coils are divided into 3 groups including one set of 4 coils having different phase numbers, and group numbers 1 to 3 are assigned to each group. In FIG. 9, the group number and phase number of each coil are represented by (group number, phase number). In this case, since the group numbers are 1 to 3 and the phase numbers are 1 to 4, each coil is divided into the following three groups.
First group (1.1) (1.2) (1.3) (1.4)
Second group (2.1) (2.2) (2.3) (2.4)
Third group (3.1) (3.2) (3.3) (3.4)
The terminal ends (neutral points) of the coils belonging to the same group are connected to each other. That is, the stator coil of the second rotating electrical machine 60 is Y-connected.
[0050]
Next, the coil (ij) of the first rotating electrical machine 59 and the coil (ji) of the second rotating electrical machine 60 are connected to the same terminal of the 12-phase inverter having 12 output terminals shown in FIG. Connect. That is,
The terminal 1 of the coil (1.1) of the first rotating electrical machine and the terminal 1 of the coil (1.1) of the second rotating electrical machine are commonly connected to the terminal 1 of the 12-phase inverter.
The terminal 2 of the coil (1.2) of the first rotating electrical machine and the terminal 5 of the coil (2.1) of the second rotating electrical machine are commonly connected to the terminal 2 of the 12-phase inverter.
The terminal 3 of the coil (1.3) of the first rotating electrical machine and the terminal 9 of the coil (3.1) of the second rotating electrical machine are commonly connected to the terminal 3 of the 12-phase inverter.
・
・
The terminal 12 of the coil (4.3) of the first rotating electrical machine and the terminal 12 of the coil (3.4) of the second rotating electrical machine are commonly connected to the terminal 12 of the 12-phase inverter.
In addition, said connection is the same as that of FIG.
[0051]
Next, current control of the composite rotating electrical machine connected as described above will be described.
First, when only the first rotating electrical machine 59 is driven (three-phase driving by the U phase, V phase, and W phase), the coil having the phase number 1 of the first rotating electrical machine 59 has a U phase and a phase number of 2. The terminal voltage of each coil is controlled by a 12-phase inverter so that the V-phase current flows through the coil and the W-phase current flows through the coil whose phase number is 3. As a result, a rotating magnetic field having four pole pairs is generated.
At this time, the voltage is also applied to the coil terminal of the second rotating electrical machine 60, but the U-phase voltage is applied to all the terminals of the coil of the second rotating electrical machine whose group number is 1, and the second whose group number is 2. A V-phase voltage is applied to all the terminals of the rotating electrical machine coil, a W-phase voltage is applied to all the terminals of the second rotating electrical machine coil whose group number is 3, and the ends of the coils in each group are mutually connected. Therefore, no current flows through the coil of the second rotating electrical machine 60.
[0052]
Next, when only the second rotating electrical machine 60 is driven (four-phase driving by the A phase, B phase, C phase, and D phase), the coil having the phase number of the second rotating electrical machine 60 is set to the A phase, The terminal voltage of each coil is controlled by a 12-phase inverter so that a B-phase current flows through a coil with a phase number of 2, a C-phase current flows through a coil with a phase number of 3, and a D-phase current flows through a coil of a phase number of 4. To do. As a result, a rotating magnetic field having three pole pairs is generated.
At this time, a voltage is also applied to the coil terminal of the first rotating electrical machine 59, but the A-phase voltage is applied to all the terminals of the coil of the first rotating electrical machine 59 whose group number is 1, and the group number is 2. B-phase voltage is applied to all terminals of the coil of the first rotating electrical machine 59, C-phase voltage is applied to all terminals of the coil of the first rotating electrical machine 59 whose group number is 3, and the first rotating electrical machine 59 whose group number is 4. Since the D-phase voltage is applied to all the terminals of the coils and the terminal ends of the coils in each group are connected to each other, no current flows through the coils of the first rotating electrical machine 59.
[0053]
Next, when the first rotating electrical machine 59 and the second rotating electrical machine 60 are driven simultaneously, a U-phase current flows through the coil (1.1) of the first rotating electrical machine 59 and the second rotating electrical machine 60 is driven. A voltage that causes the A-phase current to flow through the coil (1.1) is output to the terminal 1 of the 12-phase inverter. At this time, a composite current in which the U-phase current and the A-phase current are combined flows through the terminal 1 of the 12-phase inverter. Similarly, a composite current of V-phase current and A-phase current flows through terminal 2 of the 12-phase inverter, and a composite current of W-phase current and A-phase current flows through terminal 3 of the 12-phase inverter. Also in this case, only the U-phase, V-phase, and W-phase currents flow through the coils of the first rotating electrical machine 59, and only the A-phase, B-phase, C-phase, and D-phase flow through the coils of the second rotating electrical machine 60. .
[0054]
Further, the current control device for supplying the current as described above to the first rotating electric machine 59 and the second rotating electric machine 60 has the configuration as shown in FIGS. 5 and 6 and has the following current. Supply. That is,
When the control current of each rotating electrical machine corresponding to the phase number 1 is used as a reference,
The control current for the first rotating electrical machine corresponding to the phase number j is a current whose phase is different by 360 degrees × (j−1) / m1 with respect to the reference,
The control current for the second rotating electrical machine corresponding to the phase number i is a current whose phase is different by 360 degrees × (i−1) / m2 with respect to the reference,
Corresponds to phase number j to the terminal where the stator coil of the first rotating electrical machine with group number i and phase number j is connected to the stator coil of the second rotating electrical machine with group number j and phase number i The terminal voltage is controlled so that a composite current obtained by combining the control current for the first rotating electrical machine and the control current for the second rotating electrical machine corresponding to the phase number i flows.
[0055]
As described above, in the composite rotating electrical machine according to the present embodiment, only the current synchronized with the rotor rotation of each rotating electrical machine flows through the stator coil of each rotating electrical machine. Is the same as the copper loss when driven by a dedicated inverter. Further, a composite current flows inside the inverter, and the loss generated inside the inverter is smaller than the sum of the loss generated inside each inverter when each rotating electrical machine is driven by a dedicated inverter. This is because the current average value of the composite current obtained by combining the control currents of each rotating electrical machine is smaller than the value obtained by individually calculating the current average value of the control current of each rotating electrical machine and calculating the sum. by.
[0056]
Next, FIG. 10 is a second circuit diagram showing the connection of the stator coils. This circuit diagram is the same as FIG. 9 except that the connection of the stator coils of the first rotating electrical machine 59 and the second rotating electrical machine 60 is Δ connection in the circuit shown in FIG.
[0057]
Next, FIG. 11 is a third circuit diagram showing the connection of the stator coils.
In FIG. 11, in the first rotating electrical machine 59, the numbers of the coils included in each group are the same as those in FIG. 9, for example, the first group is (1.1) (1.2) (1.3). However, in this case, the coil of the terminal 1 is (1.1), the coil of the terminal 5 is (1.2), and the coil of the terminal 9 is (1.3).
Similarly, in the second rotating electrical machine 60, the first group includes the terminal 1 coil (1.1), the terminal 10 coil (1.2), the terminal 7 coil (1.3), and the terminal 4 The coil becomes (1.4).
[0058]
As shown in FIG. 11, the defined “group” does not necessarily have to be composed of adjacent coils. In short, it is only necessary to include k1 (k2) coils (one in this example) through which currents of different phases flow.
[0059]
Further, in the example of FIG. 11, the coils of the same group are separated by 120 degrees or 90 degrees, but such an arrangement is not essential. Such an arrangement completely realizes that “the current of the self flows and the current of the other party does not flow” in the combination of the 4-pole pair 3-phase and the 3-pole pair 4-phase, and the coil terminal of each rotating electrical machine 1, 1, 2, 2, 3, 3,... Can be connected.
[0060]
Next, FIG. 12 to FIG. 14 are circuit diagrams in another embodiment showing a connection method, FIG. 12 is a circuit diagram showing a controller and a driver, FIG. 13 is a circuit diagram showing a nine-phase inverter, and FIG. It is a circuit diagram which shows the connection of a phase inverter and a stator coil. The circuits of FIGS. 12 and 13 are connected to each other at the same reference numerals a, a ′, b, b ′..., I, i ′, and the circuits of FIGS. They are connected to each other at the same reference numerals. In addition, the component of each circuit is the same as that of the said FIGS. 5-7, and the part from which the number of phases changed from 12 phases to 9 phases differs.
[0061]
In FIG.

It is. That is, in this case, a rotating electrical machine having 3 pole pairs and 3 phases and a rotating electrical machine having 3 pole pairs and 3 phases are combined.
[0062]
FIG. 15 is a first circuit diagram illustrating a connection example of the first rotating electrical machine and the second rotating electrical machine that are suitable for the above-described composite rotating electrical machine. In addition, the coil number (1.1) (1.2) (1.3) etc. in FIG. 14 and the coil which attached | subjected the same code | symbol of FIG. 15 show the same thing.
[0063]
Hereinafter, the connection method will be described with reference to FIG.
First, in the first rotating electrical machine 59, phase numbers circulating between 1 and 3 are assigned to nine coils in order from an arbitrary coil (the top coil in FIG. 15). The nine coils are divided into three groups including one set of three coils having different phase numbers, and group numbers 1 to 3 are assigned to the groups. In FIG. 15, the group number and phase number of each coil are represented by (group number, phase number). In this case, since the group numbers are 1 to 3 and the phase numbers are 1 to 3, the coils are then divided into 3 groups.
First group (1.1) (1.2) (1.3)
Second group (2.1) (2.2) (2.3)
Third group (3.1) (3.2) (3.3)
And the termination | terminus (one which is not a terminal connected to an inverter) of each coil which belongs to the same group is connected mutually. That is, the stator coil of the first rotating electrical machine 59 is Y-connected. However, Δ connection is also possible as in FIG.
[0064]
Similarly, in the second rotating electrical machine 60, nine coils are divided into first to third groups. Also in this case, the end of each coil belonging to the same group (which is not a terminal connected to the inverter) is connected to each other, and the stator coil of the second rotating electrical machine 60 is Y-connected. However, Δ connection is also possible as described above.
[0065]
Next, the coil (ij) of the first rotating electrical machine 59 and the coil (ji) of the second rotating electrical machine 60 are connected to the same terminal of the 9-phase inverter having 9 output terminals. That is,
The terminal 1 of the coil (1.1) of the first rotating electrical machine 59 and the terminal 1 of the coil (1.1) of the second rotating electrical machine 60 are commonly connected to the terminal 3 of the 9-phase inverter.
The terminal 2 of the coil (1.2) of the first rotating electrical machine 59 and the terminal 4 of the coil (2.1) of the second rotating electrical machine 60 are commonly connected to the terminal 2 of the 9-phase inverter.
The terminal 3 of the coil (1.3) of the first rotating electrical machine 59 and the terminal 7 of the coil (3.1) of the second rotating electrical machine 60 are commonly connected to the terminal 1 of the 9-phase inverter.
・
・
The terminal 9 of the coil (3.3) of the first rotating electrical machine and the terminal 9 of the coil (3.3) of the second rotating electrical machine are commonly connected to the terminal 7 of the 9-phase inverter.
In addition, said connection is the same as that of FIG.
[0066]
Next, current control of the composite rotating electrical machine connected as described above will be described.
First, when only the first rotating electrical machine 59 is driven (three-phase driving by u phase, v phase, and w phase), the coil having the phase number 1 of the first rotating electrical machine 59 has a w phase and a phase number of 2 The terminal voltage of each coil is controlled by a 9-phase inverter so that a v-phase current flows through the coil and a u-phase current flows through the coil whose phase number is 3. As a result, a rotating magnetic field having three pole pairs is generated.
At this time, the voltage is also applied to the terminal of the coil of the second rotating electrical machine 60, but the w-phase voltage is the group number of 2 for all the terminals of the coil of the second rotating electrical machine 60 whose group number is 1. The v-phase voltage is applied to all the terminals of the coil of the second rotating electrical machine 60, the u-phase voltage is applied to all the terminals of the coil of the second rotating electrical machine 60 whose group number is 3, and each of the terminals in the same group Since the other ends of the coils are connected to each other, no current flows through the coils of the second rotating electrical machine 60.
[0067]
Next, when only the second rotating electrical machine 60 is driven (three-phase driving by the U phase, V phase, and W phase), the U phase and the phase number are applied to the coil having the phase number 1 of the second rotating electrical machine 60. The terminal voltage of each coil is controlled by a nine-phase inverter so that a V-phase current flows through the coil 2 and a W-phase current flows through the coil whose phase number is 3. As a result, a rotating magnetic field having three pole pairs is generated.
At this time, a voltage is also applied to the terminal of the coil of the first rotating electrical machine 59, but the U-phase voltage is the group number of 2 for all the terminals of the coil of the first rotating electrical machine 59 whose group number is 1. The V-phase voltage is applied to all the terminals of the coil of the first rotating electrical machine 59, the W-phase voltage is applied to all the terminals of the coil of the first rotating electrical machine 59 whose group number is 3, and each of the terminals in the same group Since the other ends of the coils are connected to each other, no current flows through the coils of the first rotating electrical machine 59.
[0068]
Next, when the first rotating electrical machine 59 and the second rotating electrical machine 60 are driven simultaneously, a u-phase current flows through the coil (1.3) of the first rotating electrical machine 59 and the second rotating electrical machine 60 is driven. A voltage that causes a U-phase current to flow through the coil (3.1) is output to the terminal 1 of the 9-phase inverter. At this time, a composite current in which the u-phase current and the U-phase current are combined flows through the terminal 1 of the nine-phase inverter. Similarly, a composite current of v-phase current and V-phase current flows through terminal 2 of the 9-phase inverter, and a composite current of w-phase current and W-phase current flows through terminal 3 of the 9-phase inverter. Also in this case, only the u-phase, v-phase, and w-phase currents flow through the coils of the first rotating electrical machine 59, and only the U-phase, V-phase, and W-phase flow through the coils of the second rotating electrical machine 60.
[0069]
Further, the current control device for supplying the current as described above to the first rotating electrical machine 59 and the second rotating electrical machine 60 has the configuration as shown in FIG. 12 and FIG. Supply. That is,
When the control current of each rotating electrical machine corresponding to the phase number 1 is used as a reference,
The control current for the first rotating electrical machine corresponding to the phase number j is a current whose phase is different by 360 degrees × (j−1) / m1 with respect to the reference,
The control current for the second rotating electrical machine corresponding to the phase number i is a current whose phase is different by 360 degrees × (i−1) / m2 with respect to the reference,
Corresponds to phase number j to the terminal where the stator coil of the first rotating electrical machine with group number i and phase number j is connected to the stator coil of the second rotating electrical machine with group number j and phase number i The terminal voltage is controlled so that a composite current obtained by combining the control current for the first rotating electrical machine and the control current for the second rotating electrical machine corresponding to the phase number i flows.
In this embodiment, the number of rotor pole pairs in the two rotating electric machines constituting the composite rotating electric machine is the same, but the present invention can also be applied to such a structure.
[0070]
Next, FIG. 16 is another circuit diagram showing the connection of the stator coils.
In FIG.

It is. In other words, in this case, a rotating electrical machine having 6 pole pairs and 3 phases and a rotating electrical machine having 3 pole pairs and 3 phases are combined.
[0071]
Hereinafter, the connection method will be described with reference to FIG.
First, in the first rotating electrical machine 59, phase numbers circulating between 1 and 3 are given to 18 coils in order from an arbitrary coil (the uppermost coil in FIG. 16). The 18 coils are divided into 3 groups including 2 sets of 3 coils having different phase numbers, and group numbers 1 to 3 are assigned to each group. Then, two coils having the same phase number are connected in the same group. The terminal ends of the coils in each group are connected to each other. Therefore, this circuit is Y-connected. However, Δ connection is also possible as described above.
[0072]
Moreover, in the 2nd rotary electric machine 60, the phase number which circulates between 1 to 3 is provided to nine coils in order from an arbitrary coil (the top coil in FIG. 16). The nine coils are divided into three groups including one set of three coils having different phase numbers, and group numbers 1 to 3 are assigned to each group. The terminal ends of the coils in each group are connected to each other. Therefore, this circuit is Y-connected. However, Δ connection is also possible as described above.
[0073]
Next, the coil (ij) of the first rotating electrical machine and the coil (j.1) of the second rotating electrical machine are connected to the same terminal of the 9-phase inverter having 9 output terminals.
That is,
The terminal 1 of the two coils (1.1) of the first rotating electrical machine 59 and the terminal 1 of the coil (1.1) of the second rotating electrical machine 60 are commonly connected to the terminal 3 of the 9-phase inverter.
The terminal 2 of the two coils (1.2) of the first rotating electrical machine 59 and the terminal 4 of the coil (2.1) of the second rotating electrical machine 60 are commonly connected to the terminal 2 of the 9-phase inverter.
The terminal 3 of the two coils (1, 3) of the first rotating electrical machine 59 and the terminal 7 of the coil (3.1) of the second rotating electrical machine 60 are commonly connected to the terminal 1 of the 9-phase inverter.
・
・
The terminal 9 of the two coils (3.3) of the first rotating electrical machine 59 and the terminal 9 of the coil (3.3) of the second rotating electrical machine 60 are commonly connected to the terminal 7 of the 9-phase inverter.
[0074]
Note that the current control in the circuit of FIG. 16 is the same as the description of FIG. However, the first rotating electrical machine 59 generates a rotating magnetic field having six pole pairs.
[0075]
The connection methods described so far are summarized as follows. That is,
A first rotating electrical machine including a rotor having a number of pole pairs P1 and s1 stator coils wound in a concentrated manner and driven by an alternating current having a phase number m1;
A rotary electric machine comprising a rotor having a pole pair number P2 and s2 stator coils wound in a concentrated manner and driven by an alternating current having a phase number m2,
Between the first rotating electrical machine and the second rotating electrical machine,
s1 = P1 × m1, s2 = P2 × m2
P1 = k1 × m2, P2 = k2 × m1 where k1 and k2 are natural numbers
When p1 = P1 / k1 and p2 = P2 / k2,
p1 × m1 = p2 × m2
Is established,
The s1 stator coils of the first rotating electrical machine are given phase numbers that circulate between 1 and m1 in order from an arbitrary stator coil, and s1 stator coils are m1 stator coils having different phase numbers. Are grouped into p1 groups including k1 sets, and each group is assigned a group number from 1 to p1,
A phase number that circulates between 1 and m2 is sequentially given to s2 stator coils of the second rotating electrical machine from an arbitrary stator coil, and m2 stator coils having different phase numbers are assigned to the s2 stator coils. Are grouped into p2 groups including k2 sets, and each group is assigned a group number from 1 to p2,
The stator coils belonging to each group are connected to each other by Y connection or Δ connection, and one end of the stator coil of the first rotating electrical machine having the group number i and the phase number j and the group number j and the phase number i To one end of the stator coil of the second rotating electrical machine.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing an example of a multiphase inverter composite current controller 16 in FIG.
FIG. 3 is a block diagram showing another embodiment of the present invention.
4 is a block diagram showing a more specific embodiment of FIG. 3;
FIG. 5 is a circuit diagram showing an example of a controller and a driver in a rotating electrical machine to which the present invention is applied.
FIG. 6 is a circuit diagram showing an example of a 12-phase inverter in a rotating electrical machine to which the present invention is applied.
FIG. 7 is a circuit diagram showing a connection between an inverter and a stator coil in a rotating electrical machine to which the present invention is applied.
FIG. 8 is a circuit diagram showing one phase of a driver.
FIG. 9 is a first circuit diagram showing a stator coil connection method in a rotating electrical machine to which the present invention is applied.
FIG. 10 is a second circuit diagram showing a stator coil connection method in a rotating electrical machine to which the present invention is applied.
FIG. 11 is a third circuit diagram showing a stator coil connection method in a rotating electrical machine to which the present invention is applied.
FIG. 12 is a circuit diagram showing another example of a controller and a driver in a rotating electrical machine to which the present invention is applied.
FIG. 13 is a circuit diagram showing another example of a nine-phase inverter in a rotating electrical machine to which the present invention is applied.
FIG. 14 is a circuit diagram showing another example of a method for connecting an inverter and a stator coil in a rotating electrical machine to which the present invention is applied.
FIG. 15 is a first circuit diagram in another example showing a stator coil connection method in a rotating electrical machine to which the present invention is applied;
FIG. 16 is a second circuit diagram in another example showing a method of connecting stator coils in a rotating electrical machine to which the present invention is applied.
[Explanation of symbols]
1 ... prime mover 2 ... input shaft
3 ... 1st rotor 4 ... 1st stator
5 ... 2nd rotor 6 ... 2nd stator
7 ... Slip ring 8 ... Output shaft
9 ... 1st encoder 10 ... 2nd encoder
11 ... Multi-phase inverter 12 ... Current sensor
13 ... Voltage sensor 14 ... DC power supply
15 ... DC link capacitor
16 ... Multi-phase inverter combined current controller
17 ... Host controller 20 ... Target torque calculation section
21 ... 1st target current calculating part 22 ... 2nd target current calculating part
23 ... Current separation calculation unit 24 ... Current conversion calculation unit
25 ... 1st target voltage calculating part 26 ... 2nd target voltage calculating part
27 ... Composite voltage generation unit 28 ... Normalization and correction unit
29 ... 1st conversion part 30 ... 2nd conversion part
31 ... Addition unit 32 ... Switching unit
33 ... Minimum current phase calculation unit 34 ... Second stator through electrode search unit
35 ... Current separation calculation unit 36 ... Target current calculation unit
37 ... Current conversion calculation unit 38 ... Target voltage calculation unit
39 ... Distribution calculation part 40 ... Current judgment part
50 ... Controller 51 ... Driver
52 ... Signal source 53 ... Adder
54 ... Sample hold circuit 55 ... Triangular wave oscillator
56 ... DC power supply 57 ... Capacitor
58 ... switching circuit 59 ... first rotating electrical machine
60 ... Second rotating electrical machine 61 ... Comparator
62 ... Inverter
S1, S2 ... Torque command signal S3, S4 ... Phase signal
L ... Stator coil Z ... Impedance
a, b, c, d ... neutral point A, B, C, D, E, F ... neutral point

Claims (4)

An input shaft mechanically coupled to the prime mover;
A first rotor mechanically coupled to the input shaft;
A first stator electromagnetically coupled to the first rotor, rotatable relative to the first rotor, and mechanically coupled to an output shaft;
A second rotor mechanically coupled to the output shaft;
In a combined rotating electric machine comprising a second stator that is electromagnetically coupled to the second rotor and fixed to the outside,
By supplying a composite current from a common multi-phase inverter to the coil of the first stator and the coil of the second stator, the first rotating electric machine including the first rotor and the first stator, and the second rotor wherein between the second second rotary electric machine comprising a stator, a transfer of torque and power a row cormorant double if current driving the rotary electric machine,
The first rotating electrical machine includes a rotor having a pole pair number P1 and s1 stator coils wound in a concentrated manner, and is driven by an alternating current having a phase number m1;
The second rotating electrical machine includes a rotor having a pole pair number P2, and s2 stator coils wound in a concentrated manner, and is driven by an alternating current having a phase number m2.
Between the first rotating electrical machine and the second rotating electrical machine,
s1 = P1 × m1, s2 = P2 × m2
P1 = k1 × m2, P2 = k2 × m1 where k1 and k2 are natural numbers
When p1 = P1 / k1 and p2 = P2 / k2,
p1 × m1 = p2 × m2
Is established,
The s1 stator coils of the first rotating electrical machine are given phase numbers that circulate between 1 and m1 in order from an arbitrary stator coil, and the s1 stator coils are m1 stators having different phase numbers. Group the coils into p1 groups containing k1 sets, and give each group a group number from 1 to p1,
The s2 stator coils of the second rotating electrical machine are sequentially given phase numbers that circulate between 1 and m2, starting from an arbitrary stator coil, and s2 stator coils are m2 stators having different phase numbers. When the coils are grouped into p2 groups including k2 sets, and each group is assigned a group number from 1 to p2,
The stator coils belonging to each group are connected to each other by Y-connection or Δ-connection, and one end of the stator coil of the first rotating electrical machine having the group number i and the phase number j, the group number j and the phase number i A combined current-driven rotating electrical machine, wherein one end of a stator coil of the second rotating electrical machine is connected. A current to be supplied to the coil of the first stator, which is determined in accordance with a rotational speed difference between the first rotor rotated by the torque input from the prime mover and the output shaft and a required torque;
Claim 1, characterized in that the supply and the current to be supplied to the coils of the second stator is determined according to the output shaft torque for driving the output shaft, of the current sum of the polyphase inverter compound current driven rotary electric machine according to. Depending on the current value that Koiruhe supply of the first stator, wherein the distribution of Koiruhe supplying current of the second stator, according to claim 1 or claim, wherein the determining for each pole pair of the second stator Item 3. The composite current drive rotating electrical machine according to Item 2 . When an arbitrary phase current supplied to the coil of the first stator approaches the allowable current value of the power device forming the multi-phase inverter, the phase is selectively transferred to the second stator other than the phase. The combined current drive rotating electrical machine according to claim 3 , wherein a current is passed.

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