JPS5935578A - Current feedback circuit in motor controller - Google Patents

Current feedback circuit in motor controller

Info

Publication number
JPS5935578A
JPS5935578A JP14564882A JP14564882A JPS5935578A JP S5935578 A JPS5935578 A JP S5935578A JP 14564882 A JP14564882 A JP 14564882A JP 14564882 A JP14564882 A JP 14564882A JP S5935578 A JPS5935578 A JP S5935578A
Authority
JP
Japan
Prior art keywords
current
circuit
current feedback
light
photocoupler
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
JP14564882A
Other languages
Japanese (ja)
Inventor
Tatsuya Watabe
達也 渡部
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.)
Toyota Industries Corp
Original Assignee
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works Ltd
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 Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Priority to JP14564882A priority Critical patent/JPS5935578A/en
Publication of JPS5935578A publication Critical patent/JPS5935578A/en
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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/2805—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE:To eliminate the influence of electric noise to an electric circuit of a control system by coupling the electric circuit of the control system such as a drive circuit, a current feedback circuit and a speed control circuit through a photocoupler. CONSTITUTION:A voltage between the terminals of a shunt resistor 16, through which an armature current flows, is smoothed by a smoothing circuit which has a resistor 23 and a condenser 24, and outputted to an operational amplifier 25. A collector current which corresponds to the output of the amplifier 25 is flowed to the collector of a transistor 31 of a current mirror circuit of next stage. The first photocoupler 32 is operated on the basis of the collector current, and an emitter current of a phototransistor 32b corresponding to the quantity of light of a light emitting diode 32a is inputted to an operational amplifier 37 of the next stage. The amplifier 37 converts the emitter current into a voltage and outputs a current feedback signal IFB to a speed control circuit.

Description

【発明の詳細な説明】 この発明はモータ制御装置における電流帰還回路に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current feedback circuit in a motor control device.

従来のモータ制御装置における電流帰還回路は例えば第
１図に示すように構成されている。A current feedback circuit in a conventional motor control device is configured as shown in FIG. 1, for example.

すなわち、モータ駆動回路１に設けられた１組ノ正転用
スイッチングトランンスタ’１１’　ｒ　１　、　Ｔ　
ｒ　２若しくは１組の逆転用スイッチングトランノスタ
Ｔｒ３’、Ｔｒ４がベース端子から入力されるチョッパ
信号にてオン、オフされることに基づいて直流モータの
電機子２に流れる電流をシャント抵抗３に流す。このシ
ャント抵抗３の端子間電圧は抵抗４及びコンデンサ５と
からなる平滑回路を介して電流帰還回路６を構成するオ
ペアップ７に出力される。そして、オペアンプ７はこの
端子間電圧を抵抗８，９で決まる増幅率で増幅して、電
流帰還信号ＩＦＢを作る。なお、Ｄ１〜Ｄ４はフライホ
イール用のタイオードである。That is, one set of forward rotation switching transistors '11' r 1 , T provided in the motor drive circuit 1
r 2 or a set of reverse switching trannostars Tr3' and Tr4 are turned on and off by the chopper signal input from the base terminal, and the current flowing through the armature 2 of the DC motor is caused to flow through the shunt resistor 3. . The voltage between the terminals of this shunt resistor 3 is outputted to an operational amplifier 7 forming a current feedback circuit 6 via a smoothing circuit consisting of a resistor 4 and a capacitor 5. Then, the operational amplifier 7 amplifies this inter-terminal voltage with an amplification factor determined by resistors 8 and 9 to generate a current feedback signal IFB. Note that D1 to D4 are diodes for the flywheel.

ところがこの方式だと、モータ駆動回路１と制御系の電
流帰還回路６は共通の１つのアース線１０を使用してい
るため、速度制御回路にノイズが侵入し制御回路が誤動
作しやすくなる。However, in this method, since the motor drive circuit 1 and the current feedback circuit 6 of the control system use one common ground wire 10, noise enters the speed control circuit and the control circuit is likely to malfunction.

この発明は前記問題点を解消するためになされたもので
あって、その目的はモータ駆動回路のアース線と、制御
系の回路のアース線を分離して、精度の高い電流帰還信
号を作るとともに速度制御回路の安定をはかることがで
きるモータ制御装置における電流帰還回路を提供するに
ある。This invention was made to solve the above problems, and its purpose is to separate the ground wire of the motor drive circuit and the ground wire of the control system circuit to create a highly accurate current feedback signal. An object of the present invention is to provide a current feedback circuit in a motor control device that can stabilize a speed control circuit.

以下、この発明を具体化した一実施例を第２図に従って
説明する。An embodiment embodying the present invention will be described below with reference to FIG.

第２図において、駆動回路Ｃ１の一組の正転用スイッチ
ングトランンスタ１１，１２は速度制御回路（図示せず
）からベース端子に入力されるチョッパ信号ＳＱＬにて
オン、オフ制御され、直流モータの電機子１３に直流電
源ＶＢを印加する。In FIG. 2, a pair of forward switching transistors 11 and 12 in a drive circuit C1 are controlled on and off by a chopper signal SQL input from a speed control circuit (not shown) to a base terminal, and the DC motor DC power supply VB is applied to the armature 13 of.

そして、この時、電機子１３には電機子電流が第２図に
おいて左から右に流れ、直流モータは正転駆動される。At this time, an armature current flows through the armature 13 from left to right in FIG. 2, and the DC motor is driven in normal rotation.

−組の逆転用スイッチングトランジスタ１４．１５は前
記速度制御回路からベース端子に人力されるチョッパ信
号ＳＧ２にてオン、オフ制御され、同しく電機子１３に
直流電源ＶＢを印加する。そしてこの時、電機子１３に
は電機子電流が右から左に流れ直流モータは逆転駆動さ
れる。The reversing switching transistors 14 and 15 of the - group are controlled on and off by a chopper signal SG2 input from the speed control circuit to the base terminal, and also apply DC power VB to the armature 13. At this time, an armature current flows through the armature 13 from right to left, and the DC motor is driven in reverse.

検出体としてのンヤント抵抗１６は直流電源ＶＩ３のア
ース線１７と前記正転用及び逆転用トランジスタ１２．
１５のエミッタ端子を結ぶ共通線１８間に接続され、前
記電機子電流が同シャント抵゛抗１６を介してアース線
１７に流れるようにしている。１９〜２２はフライホイ
ール用タイオードである。Ant resistance 16 as a detection body is connected to the ground wire 17 of DC power supply VI3 and the forward and reverse rotation transistors 12.
It is connected between a common line 18 connecting the 15 emitter terminals, and the armature current flows to the ground line 17 via the shunt resistor 16. 19 to 22 are flywheel diodes.

抵抗２３とコンデンサ２４とからなる平滑回路はその抵
抗２３の一端が前記共通線１８に接続され、前記シャン
ト抵抗１６の端子間電圧を平滑にして次のオペアンプ２
５の非反転入力端子に出力する。A smoothing circuit consisting of a resistor 23 and a capacitor 24 has one end of the resistor 23 connected to the common line 18, and smoothes the voltage between the terminals of the shunt resistor 16 to supply the next operational amplifier 2.
It outputs to the non-inverting input terminal of 5.

前記オペアンプ２５は反転入力端子とアース線１７、間
に接続した抵抗２６ａと、同反転入力端子と出力端子間
に接続した抵抗２６１Ｊとで決まる増幅率で前記端子間
電圧を増幅する。なお、オペアンプ２５は抵抗２７と直
列に接続されたツェナータイオード２８のツェナー電圧
で決まる電圧が印加され、この電圧によりドライブされ
るようになっている。The operational amplifier 25 amplifies the voltage between the terminals with an amplification factor determined by the inverting input terminal and the ground wire 17, a resistor 26a connected between the inverting input terminal and the output terminal, and a resistor 261J connected between the inverting input terminal and the output terminal. Note that a voltage determined by the Zener voltage of a Zener diode 28 connected in series with the resistor 27 is applied to the operational amplifier 25, and the operational amplifier 25 is driven by this voltage.

抵抗２９と２個のトランジスタ３０，３１とから構成さ
れるカレントミラー回路は前記オペアンプ２５から出力
される出力電圧に比例したコレクタ電流がトランジスタ
３０に流れる。従って、トランジスタ３０のコレクタ電
流と一致したコレクタ電流が他方のトランジスタ３１の
コレクタに流れることになる。In a current mirror circuit composed of a resistor 29 and two transistors 30 and 31, a collector current proportional to the output voltage output from the operational amplifier 25 flows through the transistor 30. Therefore, a collector current matching the collector current of transistor 30 flows to the collector of the other transistor 31.

第１のホトカプラ３２は発光ダイオード３２ａとホトト
ランジスタ３２Ｉ〕とて構成され、その発光タイオード
３２ａの一′端か前記トランジスタ３１のコレクタ端子
に接続され、他端が抵抗３３を介して直流電源ＶＢのプ
ラス端子に接続されている。従って、発光タイオード３
２ａの光量はトランジスタ３１のコレクタ電流に対して
非直線的に変化する。The first photocoupler 32 is composed of a light emitting diode 32a and a phototransistor 32I], one end of the light emitting diode 32a is connected to the collector terminal of the transistor 31, and the other end is connected to the DC power supply VB via a resistor 33. connected to the positive terminal. Therefore, the light emitting diode 3
The amount of light 2a changes non-linearly with respect to the collector current of the transistor 31.

第２のホトカプララ３４は発光タイオード３４ａとホｌ
−ｈランラスタ３４１〕とて構成され、そのホトトラン
ジスタ クタ端子に、コレクタ端子が抵抗３５を介して直流電源
ＶＢのプラス端子に接続されている。そして、同ホトト
ランジスタ３４１Ｊは発光タイオード３４、の光量に比
例したエミッタ電流が流れる。The second photocoupler 34 is a light emitting diode 34a and a hole.
-h run raster 341], and its phototransistor collector terminal is connected to the positive terminal of the DC power supply VB via a resistor 35. An emitter current proportional to the amount of light from the light emitting diode 34 flows through the phototransistor 341J.

従って、前記第１のホトカプラ３２の発光タイオード３
２ａに流れる電流は前記トランジスタ３１のコレクタ電
流から前記ホトトランジスタ３４ｂのエミッタ電流を引
いた値の電流が流れる。Therefore, the light emitting diode 3 of the first photocoupler 32
The current flowing through 2a is equal to the collector current of the transistor 31 minus the emitter current of the phototransistor 34b.

前記第１のホトカプラ３２のホトトランジスタ３２１Ｊ
はそのコレクタ端子が直流電源子Ｂのプラス端子に接続
され、エミッタ端子が抵抗３６を介して電流帰還回路Ｃ
２を構成するオペアンプ３７の反転入力端子に接続され
ている。従って、同ホトトランジスタ オード３２ａの光量すなわち同発光タイオード３２ａに
流れる電流に相対した値となってオペアンプ３７に出力
される。そして、オペアンプ３７はこのエミッタ電流を
電流−電圧交換して電流帰還信号ＩＦＢとして出力する
。なお、オペアンプ３７はその反転入力端子と出力端子
間に抵抗３８を接続するとともに前記直流電源子Ｂがド
ライブ用電源として印加され、又前記アース線１７とは
別個のアース線３９によりオペアンプ３７の基準電圧を
得る。Phototransistor 321J of the first photocoupler 32
The collector terminal is connected to the positive terminal of the DC power supply element B, and the emitter terminal is connected to the current feedback circuit C through the resistor 36.
It is connected to the inverting input terminal of an operational amplifier 37 constituting the circuit 2. Therefore, the amount of light from the phototransistor 32a, ie, the value relative to the current flowing through the light emitting diode 32a, is output to the operational amplifier 37. The operational amplifier 37 performs current-voltage exchange on this emitter current and outputs it as a current feedback signal IFB. Note that the operational amplifier 37 has a resistor 38 connected between its inverting input terminal and output terminal, and the DC power supply element B is applied as a drive power source. Get voltage.

また、オペアンプ３７はその出力端子か抵抗４子に接続
され、同オペアップ３７から出力される電流帰還信号Ｉ
ＦＨの電圧値に相対して、発光タイオード３４ａの光量
を制御するようになっている。そして、ホｌ−　１−ラ
ンノスタ３４１）の工εツタ電流が制御され、この制御
により前記第１ホトカプラ３２の非直線性が補正される
ようになっている。In addition, the operational amplifier 37 is connected to its output terminal or to the four resistors, and the current feedback signal I output from the operational amplifier 37 is
The amount of light from the light emitting diode 34a is controlled relative to the voltage value of FH. Then, the electric current of the photocoupler 341) is controlled, and the nonlinearity of the first photocoupler 32 is corrected by this control.

次に上記のように構成したモータ制御装置における電流
帰還回路の作用について説明する。Next, the operation of the current feedback circuit in the motor control device configured as described above will be explained.

今、速度制御回路からチョッパ信号ＳＧＩが正転用スイ
ッチングトランジスタ１１．１２に出力され、直流モー
タが所定の速度て正転駆動されているとき、電機子電流
がシャン１〜抵抗１６に流れる。そして、この時のシャ
ント抵抗１６の端子間電圧は抵抗２３とコンデンサ２４
とからなる平滑回路にて平滑されて、オペアンプ２５に
出力され、同アンプ２５にて増幅される。そして、次段
のカレントミラー回路のトランジスタ３１のコレクタは
そのオペアンプ２５の出力、すなわちシャント抵抗１６
の端子間電圧に相対した値のコレクタ電流が流れる。Now, the chopper signal SGI is outputted from the speed control circuit to the switching transistors 11 and 12 for forward rotation, and when the DC motor is driven to rotate forward at a predetermined speed, an armature current flows through the resistor 1 to the resistor 16. At this time, the voltage between the terminals of the shunt resistor 16 is the voltage between the resistor 23 and the capacitor 24.
The signal is smoothed by a smoothing circuit consisting of the following, outputted to an operational amplifier 25, and amplified by the same amplifier 25. The collector of the transistor 31 of the current mirror circuit in the next stage is connected to the output of the operational amplifier 25, that is, the shunt resistor 16.
A collector current with a value relative to the terminal voltage flows.

このコレクタ電流に基づいて第１のホ］・カブラ３２は
動作し、次段のオペアンプ３７には発光タイオード３２
ａの光量すなわち前記コレクタ電流に相対したホトトラ
ンジスタ３　２　ｂのエミッタ電流が人力される。オペ
アップ３７はこのエミッタ電流を電流−電圧変換して電
流帰還信号ＩＦＢとして前記速度制御回路に出力する。Based on this collector current, the first converter 32 operates, and a light emitting diode 32 is connected to the operational amplifier 37 in the next stage.
The amount of light a, that is, the emitter current of the phototransistor 3 2 b relative to the collector current is input manually. The operation up 37 converts this emitter current into a current and voltage and outputs it to the speed control circuit as a current feedback signal IFB.

そして、速度制御回路はこの電流帰還信号Ｉ　ＦＢに基
づいて、その時の直流モータの電機子電流がどのくらい
かを検出し、直流モータが所望の回転速度となるように
前記チョッパ信号８０１のチョッパ比を変えて前記正転
用スイッチングｊ〜ラン　′ノスタ１１，１２に出力す
る。Then, the speed control circuit detects the armature current of the DC motor at that time based on this current feedback signal IFB, and adjusts the chopper ratio of the chopper signal 801 so that the DC motor reaches the desired rotation speed. The normal rotation switching j to run' nostars 11 and 12 are then outputted.

このように本実施例では機械部を持つ駆動回路Ｃ１と、
電流帰還回路Ｃ２及び速度制御回路等の制御系の電気回
路とを第１のホトカブラ３２を介して結合したので電源
電圧の違い又は機械部が発する有害な電気的雑音が制御
系の電気回路に影響を与えることはない。In this way, in this embodiment, the drive circuit C1 having a mechanical part,
Since the current feedback circuit C2 and the electrical circuits of the control system such as the speed control circuit are coupled through the first photocoupler 32, differences in power supply voltage or harmful electrical noise generated by the mechanical parts will not affect the electrical circuits of the control system. will not be given.

また、本実施例では第２のホトカブラ３４の発光ダイオ
ード３４ａの光量が前記電流帰還信号■Ｆ　Ｂの値に基
づいて制御される。そして、その光量に基づいてホトト
ランレスタ３４１＋のエミッタ電流の値が制御され、前
記カレントミラー回路のトランジスタ３１のコレクタ端
子に供給されるため、第１のホｌ−カブラ３２の発光タ
イオード３２ａに流れる電流はこのエミッタ電流によっ
て変化する。Further, in this embodiment, the amount of light from the light emitting diode 34a of the second photocoupler 34 is controlled based on the value of the current feedback signal FB. Then, the value of the emitter current of the phototransistor 341+ is controlled based on the amount of light and is supplied to the collector terminal of the transistor 31 of the current mirror circuit, so that the current flowing through the light emitting diode 32a of the first hole coupler 32 is It changes depending on this emitter current.

従って、この工２ツタ電流によって第１のホトル カブラ３２の発光タイオード３２の非直線性が直線性に
補正されることになりシャント抵抗１６の端子間電圧に
相対した値の電流帰還信号ＩＦＢを得ることができる。Therefore, the nonlinearity of the light emitting diode 32 of the first photocoupler 32 is corrected to linearity by this double current, and a current feedback signal IFB having a value relative to the voltage between the terminals of the shunt resistor 16 can be obtained. I can do it.

そして、この電流帰還回路を機械部から発生する電気的
雑音が多くしかも完全なアースがとりにくいバッテリー
フォークリフトにおける駆動モータの速度制御に応用す
れば、同駆動モータの速度制御は精度の高いものとなり
、フォークリフトを安全かつ確実に走行させることがで
きる。If this current feedback circuit is applied to the speed control of the drive motor in a battery forklift, where there is a lot of electrical noise generated from the mechanical parts and it is difficult to ensure complete grounding, the speed control of the drive motor will be highly accurate. A forklift can be operated safely and reliably.

なお、この発明は前記実施例に限定されるものではなく
例えば前記チョッパ方式のモータ速度制御方法以外の制
御方法に応用したりする等この発明の趣旨を逸脱しない
範囲で任意に変更してもよい。Note that this invention is not limited to the above-described embodiments, and may be modified as desired without departing from the spirit of the invention, such as applying to control methods other than the chopper-type motor speed control method described above. .

以上詳述しｔコように、この発明は駆動回路に設けたモ
ータの回転速度を電気的に検出する検出体と、その検出
体の検出値に相対して速度制御のｔコめの電流帰還信号
を出力す８電流帰還回路とを第１のホＩ・カブラにより
結合するとともに、同電流帰還信号に基づいて動作制御
され前記第１のホトカブララの非直線性を補正する第２
のホ１〜カブラを設（すたことにより、第１のホ１−カ
ブラの非直線性が補正され、しかも電流帰還回路は駆動
回路で発生する電気的雑音を受：すないので、精度の高
い電流帰還信号を作ることができ、モータ制御装置にお
ける電流帰還回路として産業１優れたものである。As described in detail above, the present invention includes a detection body for electrically detecting the rotational speed of a motor provided in a drive circuit, and a current feedback for speed control relative to the detection value of the detection body. 8 current feedback circuits that output signals by a first photo coupler, and a second photo coupler whose operation is controlled based on the same current feedback signal to correct nonlinearity of the first photo coupler.
By providing the first hole-coupler, the non-linearity of the first hole-coupler is corrected, and the current feedback circuit does not receive electrical noise generated in the drive circuit, so accuracy is improved. It can generate a high current feedback signal and is the best in the industry as a current feedback circuit for motor control devices.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のモータ制御装置における電流帰還回路図
、 第２図はこの発明を具体化したモータ制御装置における
電流帰還回路である。FIG. 1 is a current feedback circuit diagram of a conventional motor control device, and FIG. 2 is a current feedback circuit diagram of a motor control device embodying the present invention.

Claims (1)

【特許請求の範囲】 １　速度制御回路からの制御信号に基づいてモータに駆
動電源を供給するとともに所定の速度に駆動させる駆動
回路と、 前記駆動回路に設けられモータの駆動電流を検出するた
めの検出体と、 前記検出体の検出値に相対した速度制御のための電流帰
還信号を前記速度制御回路に出力する電流帰還回路と、 からなるモータ制御装置において、 前記駆動回路に設けた検出体と前記電流帰還回路との間
に、 同検出体の検出値に相対した値の電流を流すためのカレ
ンｌ−ミラー回路と、 発光素子と受光素子とから構成され、前記カレントミラ
ー回路に流れる電流に基づいて同発光素子を発光させ、
その発光量に相対した値の電流を同受光素子より前記電
流帰還回路に出力する第１のホトカブラと、 発光素子と受光素子とから構成され、前記電流帰還回路
の電流帰還信号に基づいて前記発光素子の発光量が制御
され、その発光量に相対した値の電流を同受光素子より
カレントミラー回路に供給し、前記第１のホトカブラの
発光素子における発光量の非直線性を補正する第２のホ
トカブラと、を設けたことを特徴とするモータ制御装置
における電流帰還回路。 ２　駆動回路に設けられた検出体は直流モータの電機子
巻線に対して直列に接続されたシャン１〜抵抗である特
許請求の範囲第１項に記載のモータ制御装置における電
流帰還回路。 ３　第１及び第２のホトカブラの発光素子及び受光素子
はそれぞれ発光量・ｔオード及びホト１〜ランジスタで
ある特許請求の範囲第１項に記載のモータ制御装置にお
ける電流帰還回路。[Scope of Claims] 1. A drive circuit that supplies drive power to the motor and drives it to a predetermined speed based on a control signal from the speed control circuit; and a drive circuit provided in the drive circuit for detecting the drive current of the motor. A motor control device comprising: a detection object; a current feedback circuit that outputs a current feedback signal for speed control relative to a detected value of the detection object to the speed control circuit; Between the current feedback circuit and the current mirror circuit, the current mirror circuit is configured to flow a current having a value relative to the detected value of the detection object, and a light emitting element and a light receiving element. The light-emitting element emits light based on the
A first photocoupler that outputs a current having a value relative to the amount of light emitted from the light receiving element to the current feedback circuit, and a light emitting element and a light receiving element, A second photocoupler, in which the amount of light emitted by the element is controlled, and a current having a value relative to the amount of light emitted is supplied from the light receiving element to the current mirror circuit to correct non-linearity in the amount of light emitted by the light emitting element of the first photocoupler. 1. A current feedback circuit in a motor control device, comprising a photocoupler. 2. A current feedback circuit in a motor control device according to claim 1, wherein the detection body provided in the drive circuit is a resistor connected in series with an armature winding of a DC motor. 3. The current feedback circuit in the motor control device according to claim 1, wherein the light emitting element and the light receiving element of the first and second photocouplers are a light emitting amount/tode and a phototransistor, respectively.
JP14564882A 1982-08-23 1982-08-23 Current feedback circuit in motor controller Pending JPS5935578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14564882A JPS5935578A (en) 1982-08-23 1982-08-23 Current feedback circuit in motor controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14564882A JPS5935578A (en) 1982-08-23 1982-08-23 Current feedback circuit in motor controller

Publications (1)

Publication Number Publication Date
JPS5935578A true JPS5935578A (en) 1984-02-27

Family

ID=15389867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14564882A Pending JPS5935578A (en) 1982-08-23 1982-08-23 Current feedback circuit in motor controller

Country Status (1)

Country Link
JP (1) JPS5935578A (en)

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