JPS62221897A - 電動機の制御装置 - Google Patents

電動機の制御装置

Info

Publication number
JPS62221897A
JPS62221897A JP61065371A JP6537186A JPS62221897A JP S62221897 A JPS62221897 A JP S62221897A JP 61065371 A JP61065371 A JP 61065371A JP 6537186 A JP6537186 A JP 6537186A JP S62221897 A JPS62221897 A JP S62221897A
Authority
JP
Japan
Prior art keywords
current
motor
converter
phase
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61065371A
Other languages
English (en)
Inventor
Kenji Kawagishi
川岸　賢至
Masaharu Uko
宇高　正晴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP61065371A priority Critical patent/JPS62221897A/ja
Priority to US07/029,228 priority patent/US4788485A/en
Publication of JPS62221897A publication Critical patent/JPS62221897A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/425—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H02P25/024—Synchronous motors controlled by supply frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は３相交流電源力率を改善できる電動機の制御
装置に関するものである。
〔従来の技術〕
第４図は、例えば特開昭和５５−９４５８３号公報に示
された従来の電動機の制御装置を示す回路構成図で、一
方が３相交流電源に、他方が３相交流電動機にそれぞれ
接続されている。
図において、１は３相交流電源、２はパルス幅変調方式
の第１の電力変換器、３は３相交流電動機、４はパルス
幅変調方式の第２の電力変換器、５は３相交流電源１に
一方の端子群が接続されたＡＣリアクトルにして、この
ＡＣリアクトル５の他方の端子群には第１の電力変換器
２の交流側端子が接続されている。６は直流平滑用コン
デンサにして、この直流平滑用コンデンサ６には第１の
電力変換器２の直流側端子が接続されている。また、上
記直流平滑用コンデンサ６には第２の電力変換器４の直
流側端子が接続され、第２の電力変換器４の交流側端子
は３相交流電動機３に接続されている。７は基準電圧の
指令値を出力する直流電圧指令器、８は上記直流平滑用
コンデンサ６の電圧を検出する直流電圧検出器、９は直
流電圧指令器７の出力と直流電圧検出器８の出力との誤
差を演算し、その誤差を増幅して出力する誤差増幅器、
１０は３相交流電源１の３相相電圧を検出するための絶
縁変圧器、１１ｔｊ：第１の電力変換器２の３相交流電
流を検出する電流検出器、１２は演算器にして、これは
誤差増幅器９の出力、絶縁変圧器１０の出力および電流
検出器１１の出力を演算して、第１の電力変換器２の交
流側３相電圧指令を出力する。１３は三角波発生器、１
４は演算器１２の出力と三角波発生器１３の出力を比較
し、第１の電力変換器２内のスイッチング要素のオン・
オフ信号を出力する比較器、１５は比較器１４の出力で
あるオン・オフ信号を増幅して、第１の電力変換器２内
のスイッチング要素であるサイリスタのオフＯオフを制
御するゲート・アンプである。
一方、１６は第２の電力変換器４の出力周波数及び電圧
を指令する周波数指令回路、１７は可変周波数の３相正
弦波信号を発生する発振器、１８は周波数指令回路１６
と発振器１７の各出力信号を掛算する乗算器、１９は三
角波発生器、２０は乗算器１８の各々の出力と三角波発
生器１９の出力を比較し、第２の電力変換器４内のスイ
ッチング要素のオン・オフ信号を出力する比較器、２１
は比較器２０の出力であるオン・オフ信号を増幅して、
第２の電力変換器４内のスイッチング要素のオン・オフ
を制御するゲート・アンプである。
なお、ＡＣリアクトル５、第１の電力変換器２、直流電
圧指令器７、直流電圧検出器８、誤差増幅器９、絶縁変
圧器１０、電流検出器１１、演算器１２、三角波発生器
１３、比較器１４、ゲートアンプ１５を合わせたものを
、以下電力変換装置Ａと呼ぶことにする。
次に動作について説明する。第１の電力変換器２はスイ
ッチング要素のオン拳オフ制御によって、その交流側電
圧と直流側電圧との大きさの関係を変化できる機能を持
つ。
先ず、この機能をどのような動作で得ようとしているか
について説明する。直流電圧指令器７の指令する電流電
圧指令ｖｄ＊と直流平滑用コンデンサ６の電圧Ｖｄ　と
は誤差増幅器９に入力され、それらの差が増幅されて出
力される。この出力は第１の電力変換器２の直流側電流
ｉ（１の指令；ｄ＊となる０１ｄの方向を第１の電力変
換器２から直流平滑用コンデンサ６に流れるとき正とす
ると、ｉ（１申はＶｄ”　＞　Ｖｄ　　で正、ｖｄ＊〈
ｖｄで負にそれぞれなる、ように出力される。
演算器１２はｉｄ傘と絶縁変圧器１０の出力と電流検出
器１１の出力を入力として第１の電力変換器２の交流側
相電圧指令ｙｕ　＊　、　ｙｖ本および７ｗ本を演算し
て出力する。これらのｖＵ”　＋　”Ｖ”　＊　”Ｗ“
を演算出力する方法はいくつかあるが、つぎにその一つ
を示す。
１ｄＩは絶縁変圧器１０の出力する３相交流電源１の３
相相電圧ＶＲ＋　ｖＳｒ　ＶＴ　　に比例し７’ｃ　Ｋ
ＶＲ＊ＫｖＳ　ｙ　ＫＶＴにそれぞれ乗ぜられる。その
結果、ＫｖＲ１１ｉｄ＊、ＫｖｓＩＩｉｄ本、ＫｖＴ＠
ｉｄ本が作られる。
これは第１の電力変換器２の交流電流指令ｉｎ中。
１ｖ本１　’Ｗ”に相当する。実際の交流電流ｔｕ　ｌ
　’Ｖｌｉｗがｉｕ”　ｒ　ｉｖ申ｒ　’Ｗ”　　と一
致すれば、それらはｖＲ＊　ＶＳ　＋　ＶＴ　　と同相
あるいは逆位相となり、電源力率は±１となるｏ　　１
１１”　＋　’Ｖ”　＋　’Ｗ申＊　ｔｕ　＋し、ｉｗ
は３相交流電源１から第１の電力変換器２に流れる方向
を正とする。Ｖｕ＊　、　Ｖｖ＊　、　７ｗ本は（ｉｎ
”　　ｉｏ）　ｒ　（ｉｖ”　　ｊｖ）　＋（ｉｗ”　
　ｊｗ）をそれぞれ増幅して作る。
上記ｙｕ！　、　ｖｖ＊　、　ｖｗ市を三角波発生器１
３が発生する三角波と比較器１４で比較する。この比較
器１４の出力はゲートアンプ１５で増幅処理され、第１
の電力変換器２内のスイッチング要素をオン・オフ制御
するが、この時、第１の電力変換器２の交流側相電圧ｖ
ｕ　ｊ　ｖｖｌ　ＶＷの波形はパルス状になるが、その
基本波はｖｕ　”　＋　Ｖｙ　”　＋　７ｗ本と一致す
る。
第５図（ａｔは第１の電力変換器２の交流側から直流側
へ、第５図ｆｂ）は逆に直流側から交流側へ電力を供給
するときのＶＢ　、　ＶＬＩ　、　ＩＬＩ　　のベクト
ル図を示す。ゲートアンプ２１が第２の電力変換器４内
のスイッチング要素のオン・オフを制御することによっ
て、３相交流電動機３に可変電圧、可変周波数の電力が
供給されることとなる。
〔発明が解決しようとする問題点〕
従来の電動機の制御装置は以上のように構成されている
ため、３相交流電源から直流電源に電力変換を行なう際
には第１の電力変換装置（コンバータ）に電動機駆動装
置すなわち第２の電力変換装置と同等の変換装置を要し
、しかも交流電源側の電圧位相、電源電流などを検出す
る検出器も必要であシ、システム全体が大形化するなど
の問題点があった。
この発明は上記のような問題点を解消するためになされ
たもので、交流電源側の電圧位相、電源電流などを検出
する検出器を不要とすることによりコンバータ装置が大
形化することなしに電源力率全１．０近くに保つことの
できる電動機の制御装置を得ることを目的とする。
〔問題点を解決するための手段〕
この発明に係る電動機の制御装置は、３相交流電源を直
流に変換するダイオードコンバータと、このダイオード
コンバータの直流出力端に接続され、電動機を駆動する
パルス幅変調方式の電力変換装置、！：を有［２、直流
電源ラインよシミ動機の直流電流を検出器によシ検出し
、その直流電流より交流リップルのみを取出し、上記パ
ルス幅変調方式の電力変換装置を上記交流リップルに応
じてパルス幅変調制御することによシミ動機の直流電流
を平滑する構成としたものである。
〔作　用〕
この発明における電動機の制御装置は、パルス幅変調方
式の電力変換装置を電動機の直流電流を平滑するように
パルス幅変調制御することによシダイオードコンバータ
によって電源力率を１．０近くまでに制御しようとする
ものである。
従ってコンバータ装置が大形化することなしに電動機の
可変速制御が行える。
〔実施例〕
以下、この発明を一実施例に従って説明する。
第１図において、１は３相交流電源、３０は３相のダイ
オードコンバータ、３１はＤＣリアクトル、３２は同期
電動機３３を駆動するＰＷＭ変調方式のトランジスタイ
ンバータ、３４は限流抵抗、３５はブレーキ用トランジ
スタにして、上記限流抵抗３４とブレーキ用トランジス
タ３５は直列に接続されて上記ダイオードコンバータ３
０の直流出力端に接続されているスナバ−コンデンサ３
６に並列に接続されている。３７は電流検出用抵抗にし
て、この抵抗３７は同期電動機３３に流れる直流電流を
検出するためにスナバ−コンデンサ３６と同期電動機３
３との間に接続される。３８は電圧検出回路にして、こ
の電圧検出回路３８はスナバ−コンデンサ３６の端子間
の電圧を検出し制御回路３９に入力する０電流検出用抵
抗３７及び電流検出回路４０で検出された電流はバイパ
スフィルタ４１ｅ通過させた後、制御回路３９に入力す
る。４２は制御回路３９に入力される周波数指令信号、
４３はベースアンプにして、このベースアンプ４３は制
御回路３９よ多出力されるＰＷＭ変調信号、ブレーキ信
号を増幅し各々のトランジスタインバータ３２及びブレ
ーキ用トランジスタ３５を駆動する。
しかして、制御回路３９は第２図に示すように構成され
ている。すなわち図において、４４は直流電圧ｋ　Ａ　
／　Ｄ変換するＡ　／　１）コンバータ、４５はブレー
キ基準信号４６に従ってブレーキをかけるか否かを判定
するブレーキ判定回路、４７は検出された電流ｆｆ１Ａ
／１）変換するＡ／Ｄ変換回路、４８は周波数指令信号
ｆｃｆｆｉＦ／ｙ変換するＦ／Ｖ変換回路、４９は電圧
指令信号ＶＣに対して同期電動機３３の直流電流値との
誤差を算定する加算器、５０は誤差信号ｅ１ヲ増幅する
増幅器、５１はＰＷＭカウンター５２の出力と電圧指令
の誤差信号ｅ申　とを比較する比較器、５３は周波数指
令信号ｆｃをＰＷＭ変調信号に変換する周波数信号変換
回路、５４は電圧指令ＰＷＭ信号Ｖと周波数指令ＰＷＭ
信号とを加算する加算器。
以上のように構成される電動機の制御回路の動作を第２
図、第３図を参照しながら説明する。
３相交流電源１を３相ダイオードコンバータ３０で整流
すると、ダイオードコンバータ３０の直流出力端の電圧
はスナバ−コンデンサー３６が電源電圧リップルを平滑
する容量にはないので、第３図（ａ）に示すＥＤｃのよ
うに電源周波数の６倍の周波数で脈動する電圧となる。
同期電動機３３の駆動方式を６ステツプＰＷＭとし、力
率がほぼ】、０で、かつ逆起電力によるリップルの影響
が小ないトスると、同期電動機３３の直流電流は第３図
（ａｌに示すＩＤＣのように電源電圧と同様に電源周波
数の６倍の周波数で脈動する電流となる。同期電動機３
３に流れる直流電流の交流分をバイパスフィルタ４１で
フィルタリングすると、第３図ｆｂｌに示すようになる
。
この直流電流の交流分を制御回路３９に入力し電圧指令
信号Ｖｃ　との差をとり増幅器５０で増幅し、ＰＷＭ変
調信号とすると、この電流ループは丁度直流電流を平滑
するように働く。この時ｐｗＭ変調方式のトランジスタ
インバータ３２を高周波スイッチング可能なＰＷＭイン
バータで、かつ直流側に接続されているＤＣリアクトル
３１ｔ−ＰＷＭ変ｎインバータのキャリア周波数による
脈動電流を平滑させるように定数を設定すると、電流検
出抵抗３７を流れる直流電流は第３図ｆｄｌのようにな
る。（第３図（ｄｌの波形はＰＷＭキャリア周波数によ
る電流リップルは無視しである。　）従って同期電動機
３３に流れる相電流は第３図（Ｃ１に示すように電源電
圧リップルの影響のない６ステノプ状の電流が流れるこ
ととなる。又電源電流は第３図（ｅｌに示すように１２
０°区間一定に流れるため、非常に電源力率が高くなる
。
限流抵抗３４とブレーキ用トランジスタ３５はスナバ−
コンデンサ３６のコンデンサ容量が小さいため、同期電
動機３３のエネルギーを回生じた時コンデンサ３６電圧
の上昇を抑さえ、回生エネルギーを消費させるためのも
のである。
〔発明の効果〕
以上のように、この発明によれば、電動機の制御装置に
は３相交流電源を直流に変換するダイオードコンバータ
と、このダイオードコンバータの直流出力端に接続され
、電動機を駆動するパルス幅変調方式の電力変換装置と
を有し、直流電源ラインよシミ動機の直流電流を検出し
、その直流電流よシ交流リップルのみを取出し、パルス
幅変調方式の電力変換装置をこの交流リップルに応じて
パルス幅変調制御することにより電動機の直流室流を平
滑する構成としたことによシ、平滑コンデンサを用いる
ことなしに電源電圧変動、整流リップルの影響をまった
く受けないで、かつ電源力率の非常に高い小形のものが
得られる効果がある。
【図面の簡単な説明】
第１図はこの発明の一実施例による電動機の制御装置を
示す回路構成図、第２図は第１図の制御回路の構成を示
すブロック図、第３図は第１図の動作を説明するための
各部波形図、第４図は、従来の電動機制御装置の回路構
成図、第５図は第４図の動作状態の説明図である。 図において１は３相交流電源、３０は３相ダイオードコ
ンバータ、３２はＰＷＭ変調方式のトランジスタインバ
ータ、３３は同期電動機、３６はスナバ−コンデンサ、
３９は制御回路、４０は電流検出回路、４１Ｆｉ、バイ
パスフィルタ、である。 なお、図中、同一符号は同一、または相当部分を示す〇 手続補正書（自発） ６１．１２．２９ 昭和　　年　　月　　日 ２、発明の名称 電動機の制御装置 ３、補正をする者 代表者　志岐守哉 ５、補正の対象 ６、補正の内容 （１）別紙の通り特許請求の範囲を補正する。 （２）明細書をつぎのとおり訂正する。 ７、添付書類の目録 補正後の特許請求の範囲を記載した書面　１道具　　　
上 補正後の特許請求の範囲 ３相交流電源を直流に変換するダイオードコンバータと
、このダイオードコンバータの直流端側に接続され電動
機を超動するパルス幅変調方式の電力変換装置と、上記
ダイオードコンバータと電動機に流れる直流電流を検出
する検出器と、上記直流電流の交流分を通過させる高域
通過フィルタと、この高域通過フィルタの出力に応じて
上記パコンパータと電動機に流れる直流電流を所定値に
パルス幅変調制御する制御回路とを備えた電動機の制御
装置。

Claims (1)

    【特許請求の範囲】
  1. ３相交流電源を直流に変換するダイオードコンバータと
    、このダイオードコンバータの直流端側に接続され電動
    機を駆動するパルス幅変調方式の電力変換装置と、上記
    電動機の直流電流を検出する検出器と、上記直流電流の
    交流分を通過させる高域通過フィルタと、この高域通過
    フィルタの出力に応じて上記パルス幅変調方式の電力変
    換装置が電動機の直流電流を所定値にパルス幅変調制御
    する制御回路とを備えた電動機の制御装置。
JP61065371A 1986-03-24 1986-03-24 電動機の制御装置 Pending JPS62221897A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP61065371A JPS62221897A (ja) 1986-03-24 1986-03-24 電動機の制御装置
US07/029,228 US4788485A (en) 1986-03-24 1987-03-23 Apparatus for controlling electric motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61065371A JPS62221897A (ja) 1986-03-24 1986-03-24 電動機の制御装置

Publications (1)

Publication Number Publication Date
JPS62221897A true JPS62221897A (ja) 1987-09-29

Family

ID=13285040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61065371A Pending JPS62221897A (ja) 1986-03-24 1986-03-24 電動機の制御装置

Country Status (2)

Country Link
US (1) US4788485A (ja)
JP (1) JPS62221897A (ja)

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