JP2671396B2 - DC motor speed control circuit - Google Patents
DC motor speed control circuitInfo
- Publication number
- JP2671396B2 JP2671396B2 JP63163548A JP16354888A JP2671396B2 JP 2671396 B2 JP2671396 B2 JP 2671396B2 JP 63163548 A JP63163548 A JP 63163548A JP 16354888 A JP16354888 A JP 16354888A JP 2671396 B2 JP2671396 B2 JP 2671396B2
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- Prior art keywords
- current
- voltage
- circuit
- motor
- transistor
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は直流モータの速度制御回路に関し、テープレ
コーダ等に用いられ機構部の回転駆動を行なう直流モー
タの速度制御回路に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control circuit for a DC motor, and more particularly to a speed control circuit for a DC motor that is used in a tape recorder or the like and that rotationally drives a mechanical portion.
従来の技術 テープレコーダのリール駆動等を行なうために直流モ
ータが利用されている。2. Description of the Related Art A DC motor is used to drive a reel of a tape recorder.
直流モータは温度上昇に応じて回転速度が速くなる温
度特性を持っている。このため、従来の直流モータの速
度制御回路は、温度上昇に応じて低下する負の温度特性
を持たせて基準電圧を発生させ、直流モータの逆起電力
をこの基準電圧と比較して得た誤差電圧によって直流モ
ータの駆動電流を制御し、回転速度の温度補償を行なっ
ている。The DC motor has a temperature characteristic that the rotation speed increases as the temperature rises. Therefore, the speed control circuit of the conventional DC motor generates a reference voltage with a negative temperature characteristic that decreases according to the temperature rise, and obtains the counter electromotive force of the DC motor by comparing with this reference voltage. The drive current of the DC motor is controlled by the error voltage to perform temperature compensation of the rotation speed.
発明が解決しようとする課題 上記の直流モータが組込まれたテープレコーダ等にお
いては、低温度時に機構部のゴムベルト硬化等により負
荷が大きくなる。このように機構部の負荷は略０℃から
温度低下に従って大となる。このため、機構部を駆動す
る直流モータの回転速度は略０℃以下で温度低下に従っ
て徐々に低下する温度特性を持つことになる。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In a tape recorder or the like incorporating the above-mentioned DC motor, the load increases due to hardening of the rubber belt of the mechanical portion when the temperature is low. In this way, the load on the mechanical unit increases from approximately 0 ° C. as the temperature decreases. Therefore, the rotation speed of the DC motor that drives the mechanism has a temperature characteristic that the temperature gradually decreases as the temperature decreases at approximately 0 ° C. or less.
しかし、従来の直流モータの速度制御回路はこのよう
な機構部の負荷の温度変化に対する補償を行なっておら
ず低温時に直流モータの回転速度が低下するという問題
があった。However, the conventional DC motor speed control circuit does not compensate for such a temperature change of the load of the mechanical portion, and there is a problem that the rotation speed of the DC motor decreases at a low temperature.
本発明は上記の点に鑑みてなされたもので、機構部の
負荷の温度変化を補償する直流モータの速度制御回路を
提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a speed control circuit of a DC motor that compensates a temperature change of a load of a mechanical unit.
課題を解決するための手段 本発明の直流モータの速度制御回路は、機構部の回転
駆動を行なう直流モータの逆起電圧と基準電圧との誤差
電圧に応じて直流モータに流す電流を制御し、直流モー
タの回転速度を制御する。Means for Solving the Problem The speed control circuit of the DC motor of the present invention controls the current flowing to the DC motor according to the error voltage between the counter electromotive voltage and the reference voltage of the DC motor that rotationally drives the mechanism section, Controls the rotation speed of the DC motor.
第１の基準電流源は、直流モータの回転速度の温度特
性と相補的な負の温度特性を持ち後述の差動回路の一方
のトランジスタのベース電流を温度に応じて変化させる
定電圧回路と、定電圧回路により一方のトランジスタの
ベース電流を可変され、ベース電流に応じて他方のトラ
ンジスタのコレクタ電流を変化させる差動回路と、差動
回路の他方のトランジスタのコレクタ電流に応じ温度低
下により増大する第１の基準電流を出力する電流出力回
路とを有する。The first reference current source has a negative temperature characteristic that is complementary to the temperature characteristic of the rotation speed of the DC motor, and has a constant voltage circuit that changes the base current of one transistor of the differential circuit described later according to the temperature. The base voltage of one transistor is changed by the constant voltage circuit, and the differential circuit changes the collector current of the other transistor according to the base current, and increases due to the temperature drop according to the collector current of the other transistor of the differential circuit. And a current output circuit that outputs a first reference current.
第２の基準電流源は、機構部による負荷の温度特性と
相補的な温度特性を持つ電流を供給する電流供給回路
と、電流供給回路の供給する電流を第２の基準電流とし
て出力する電流出力回路とを有する。The second reference current source is a current supply circuit that supplies a current having a temperature characteristic complementary to the temperature characteristic of the load by the mechanical unit, and a current output that outputs the current supplied by the current supply circuit as a second reference current. And a circuit.
第１の電流・電圧変換器は第１の基準電流源の出力す
る第１の基準電流と第２の基準電流源の出力する第２の
基準電流との加算値を電圧に変換する。The first current / voltage converter converts the added value of the first reference current output by the first reference current source and the second reference current output by the second reference current source into a voltage.
この第１の電流・電圧変換器の出力電圧を基準電圧と
して逆起電圧との誤差電圧を得る。An error voltage from the back electromotive force voltage is obtained by using the output voltage of the first current / voltage converter as a reference voltage.
更に、第１の基準電流源の出力する第１の基準電流を
電圧に変換する第２の電流・電圧変換器と、第２の基準
電流源の出力する第２の基準電流を電圧に変換する第３
の電流・電圧変換器とを設け、この第２の電流・電圧変
換器の出力電圧を基準電圧として第３の電流・電圧変換
器の出力電圧を減算した逆起電圧との誤差電圧を得る。Further, a second current-voltage converter that converts the first reference current output from the first reference current source into a voltage, and a second reference current output from the second reference current source into a voltage. Third
Is provided, and an error voltage with respect to the back electromotive force is obtained by subtracting the output voltage of the third current-voltage converter with the output voltage of the second current-voltage converter as a reference voltage.
作用 本発明では直流モータの回転速度の温度特性を第１の
基準電流源により補償し、かつ機構部の負荷の温度特性
を第２の基準電流源により補償する。Function In the present invention, the temperature characteristic of the rotation speed of the DC motor is compensated by the first reference current source, and the temperature characteristic of the load of the mechanical section is compensated by the second reference current source.
これによって温度の低下に伴なって機構部の負荷が大
となっても一定速度で直流モータを回転させることがで
きる。As a result, the DC motor can be rotated at a constant speed even when the load on the mechanical unit increases as the temperature decreases.
実施例 第１図は本発明の回路の第１実施例のブロック図を示
す。First Embodiment FIG. 1 shows a block diagram of a first embodiment of the circuit of the present invention.
同図中、半導体集積回路の速度制御回路10の電源入力
端子10aは抵抗R0を介して電源電圧Vccの電源端子11に接
続され、速度制御回路10の出力端子10bと電源端子11と
の間に直流モータ12が接続されている。また速度制御回
路10の接地端子10cは接地されている。In the figure, the power supply input terminal 10a of the speed control circuit 10 of the semiconductor integrated circuit is connected to the power supply terminal 11 of the power supply voltage Vcc via the resistor R 0, and is connected between the output terminal 10b of the speed control circuit 10 and the power supply terminal 11. The DC motor 12 is connected to. The ground terminal 10c of the speed control circuit 10 is grounded.
速度制御回路10内の第１の基準電流源15は負の温度特
性を持っている。この負の温度特性は直流モータ12の持
つ温度上昇に応じて回転速度が早くなる正の温度特性と
相補的な特性である。The first reference current source 15 in the speed control circuit 10 has a negative temperature characteristic. This negative temperature characteristic is a characteristic complementary to the positive temperature characteristic in which the rotation speed increases with the temperature rise of the DC motor 12.
また、第２の基準電流源16は略０℃以下で動作して負
の温度特性を持っている。この負の温度特性は機構部に
よる０℃以下で温度低下に応じて回転速度が遅くなる正
の温度特性と相補的な特性である。Further, the second reference current source 16 operates at approximately 0 ° C. or lower and has a negative temperature characteristic. This negative temperature characteristic is a characteristic complementary to the positive temperature characteristic in which the rotation speed becomes slower as the temperature decreases by 0 ° C. or less by the mechanism section.
この第１及び第２の基準電流源15,16夫々の出力する
第１の基準電流と第２の基準電流との加算値が第１の電
流・電圧変換器50で電圧に変換され、基準電圧として差
動増幅器17の非反転入力端子に供給される。差動増幅器
17の反転入力端子には端子10bより直流モータ12の逆起
電圧が印加されており、差動増幅器17は両者の誤差電圧
を得て、制御用のトランジスタ18及び駆動用のトランジ
スタ19夫々のベースに供給する。トランジスタ18,19夫
々のエミッタ面積比は1:Kとされ、抵抗R0は直流モータ1
2の内部抵抗のＫ倍の抵抗値に設定されている。The added value of the first reference current and the second reference current output from each of the first and second reference current sources 15 and 16 is converted into a voltage by the first current / voltage converter 50 to obtain the reference voltage. Is supplied to the non-inverting input terminal of the differential amplifier 17. Differential amplifier
The counter electromotive voltage of the DC motor 12 is applied to the inverting input terminal of the terminal 17 from the terminal 10b, and the differential amplifier 17 obtains the error voltage of both, and the bases of the control transistor 18 and the drive transistor 19 respectively. Supply to. The emitter area ratio of each of the transistors 18 and 19 is 1: K, and the resistor R 0 is the DC motor 1
It is set to K times the internal resistance of 2.
差動増幅器17の出力する誤差電圧は制御用のトランジ
スタ18のベース電流を制御して抵抗R0の降下電圧を可変
し、これによって直流モータ12の端子間電圧を可変し、
この端子間電圧に応じた電流を駆動用のトランジスタ19
で直流モータ12に流し、直流モータ12の回転速度を一定
に制御する。The error voltage output from the differential amplifier 17 controls the base current of the control transistor 18 to change the drop voltage of the resistor R 0 , thereby changing the voltage between the terminals of the DC motor 12,
A transistor 19 for driving a current according to the voltage between these terminals
To control the rotation speed of the DC motor 12 to be constant.
第２図は第1,第２の基準電流源15,16及び第１の電流
・電圧変換器50の回路図を示す。FIG. 2 shows a circuit diagram of the first and second reference current sources 15 and 16 and the first current / voltage converter 50.
同図中、抵抗R1は第１の電流・電圧変換器50であり、
半導体集積回路の外部に外付けされた温度特性を持たな
い抵抗であり、他の素子は全て半導体集積回路内部に形
成されている。In the figure, the resistor R 1 is the first current-voltage converter 50,
It is a resistor which is externally attached to the outside of the semiconductor integrated circuit and has no temperature characteristic, and all the other elements are formed inside the semiconductor integrated circuit.
第1,第２の基準電流源15,16にまたがるpnp形トランジ
スタQ1〜Q6はカレントミラー回路30を構成している。第
１の基準電流源15内のnpn形トランジスタQ11,Q12はカレ
ントミラー構成で電流制限用の抵抗R2,R4と共にカレン
トミラー起動回路31を構成しており、端子32に電源電圧
Vccが印加されるとカレントミラー回路30にベース電流
を供給し、カレントミラー回路30を起動させる。また抵
抗R2,R4は高抵抗であり、起動後のトランジスタQ15のコ
レクタ電流に対してトランジスタQ12のコレクタ電流は
無視できる値とされている。上記トランジスタQ15,Q12
はカレントミラー回路30内のトランジスタQ1〜Q6夫々に
ベース電流を供給する。The pnp type transistors Q 1 to Q 6 which straddle the first and second reference current sources 15 and 16 form a current mirror circuit 30. The npn-type transistors Q 11 and Q 12 in the first reference current source 15 constitute a current mirror starting circuit 31 with current limiting resistors R 2 and R 4 in a current mirror configuration.
When Vcc is applied, the base current is supplied to the current mirror circuit 30 to activate the current mirror circuit 30. The resistors R 2 and R 4 have high resistance, and the collector current of the transistor Q 12 is negligible with respect to the collector current of the transistor Q 15 after starting. Transistors Q 15 and Q 12 above
Supplies a base current to each of the transistors Q 1 to Q 6 in the current mirror circuit 30.
npn形トランジスタQ17,Q18はカレントミラー構成で起
動回路33を構成し、npn形トランジスタQ19,Q20及び抵抗
R8,R9,R10は定電圧回路34を構成している。The npn-type transistors Q 17 and Q 18 form a starting circuit 33 in a current mirror configuration, and the npn-type transistors Q 19 and Q 20 and the resistor
R 8 , R 9 , and R 10 form a constant voltage circuit 34.
起動直後にはトランジスタQ6のコレクタ電流が不充分
でトランジスタQ19のベース電位が充分に上昇してない
ためのトランジスタQ19は遮断しており、この間、起動
回路33のトランジスタQ17が導通してトランジスタQ4の
コレクタ電流を抵抗R8に流しトランジスタQ16のベース
電位を決定する。この後トランジスタQ6のコレクタ電流
が増大して、抵抗R10を流れ、トランジスタQ20のベース
・エミッタ間電圧が上昇しトランジスタQ20が導通して
トランジスタQ19のベース電位が一定電位となる定常状
態では、トランジスタQ19が導通してそのエミッタ電流
が抵抗R8に流れ、トランジスタQ17のベース・エミッタ
間電圧が小さくなりトランジスタQ17は遮断し、トラン
ジスタQ4のコレクタ電流はトランジスタQ19を流れる。Starting immediately after the transistor Q 19 to base potential is not sufficiently increased transistor Q 19 is insufficient collector current of the transistor Q 6 is shut off, during which conducts the transistor Q 17 of the starting circuit 33 The collector current of the transistor Q 4 is passed through the resistor R 8 to determine the base potential of the transistor Q 16 . The collector current after the transistor Q 6 this is increased, the resistance R 10 flows, the base potential of the transistor Q 19 becomes constant potential base-emitter voltage of the transistor Q 20 becomes conductive the transistor Q 20 increases steady in the state, it flows into the emitter current resistor R 8 conducting transistor Q 19 is the base-emitter voltage decreases transistor Q 17 of the transistor Q 17 is cut off, the collector current transistor Q 19 of the transistor Q 4 Flowing.
全てのトランジスタベース・エミッタ間電圧VBEは負
の温度特性を持っており、かつ、電流密度が大なる程こ
の温度特性の温度係数が小さくなる。定電圧回路34はト
ランジスタQ19のエミッタ面積をトランジスタQ20より大
とし、かつ抵抗R8〜R10の値を適当に選定して、トラン
ジスタQ19のコレクタ電流に直流モータの回転速度の温
度特性と相補的な負の温度特性を持たせている。All transistor base-emitter voltages V BE have a negative temperature characteristic, and the higher the current density, the smaller the temperature coefficient of this temperature characteristic. In the constant voltage circuit 34, the emitter area of the transistor Q 19 is made larger than that of the transistor Q 20 and the values of the resistors R 8 to R 10 are appropriately selected so that the collector current of the transistor Q 19 has a temperature characteristic of the rotation speed of the DC motor. It has a negative temperature characteristic that is complementary to.
これによって、温度低下によりトランジスタQ19のコ
レクタ電流が増大すると差動回路35のnpn形トランジス
タQ16のベース電流が減少し、npn形トランジスタQ15の
コレクタ電流即ちカレントミラー回路30のベース電流が
増大する。従って、トランジスタQ3のコレクタ電流が増
大し、npn形トランジスタQ13,Q14及び抵抗R5,R6のカレ
ントミラー構成の電流出力回路36が抵抗R1に流す電流が
増大し、基準電圧である抵抗R1の両端電圧（端子37,38
間電圧）は温度低下に従って増大する。As a result, when the collector current of the transistor Q 19 increases due to the temperature decrease, the base current of the npn-type transistor Q 16 of the differential circuit 35 decreases, and the collector current of the npn-type transistor Q 15 , that is, the base current of the current mirror circuit 30 increases. To do. Therefore, the collector current of the transistor Q 3 increases, the current flowing through the resistor R 1 by the current output circuit 36 of the current mirror configuration of the npn transistors Q 13 , Q 14 and the resistors R 5 , R 6 increases, and the reference voltage The voltage across a resistor R 1 (terminals 37, 38
Voltage) increases with decreasing temperature.
なお、端子38が第１図の差動増幅器17の非反転入力端
子に接続され、端子37が第１図の端子10aに接続され
る。The terminal 38 is connected to the non-inverting input terminal of the differential amplifier 17 shown in FIG. 1, and the terminal 37 is connected to the terminal 10a shown in FIG.
第２の基準電流源16内で電流供給回路40のnpn形トラ
ンジスタQ9,Q10はカレントミラー構成で、トランジスタ
Q9のエミッタ面積はトランジスタQ10に比して大とされ
ており、トランジスタQ9のエミッタには値を適当に選択
された抵抗R3が接続されている。カレントミラー回路の
トランジスタQ1,Q2は互いに同一のコレクタ電流を流す
が、エミッタ面積が大とされてエミッタ電流温度係数が
大きいトランジスタQ9は０℃以下となったときトランジ
スタQ1のコレクタ電流を全て流せなくなる。この流せな
くなった余分な電流は０℃以下の温度低下に従って増大
し、上記余分な電流が機構部の負荷の温度特性と相補的
な負の温度特性を持つようトランジスタQ9,Q10及び抵抗
R3の設定が行なわれている。In the second reference current source 16, the npn type transistors Q 9 and Q 10 of the current supply circuit 40 have a current mirror configuration,
The emitter area of Q 9 is larger than that of the transistor Q 10 , and the emitter of the transistor Q 9 is connected to the resistor R 3 whose value is appropriately selected. The transistors Q 1 and Q 2 of the current mirror circuit flow the same collector current, but the transistor Q 9 having a large emitter current and a large temperature coefficient of the emitter current has a collector current of the transistor Q 1 of 0 ° C. or less. Can't drain all. Excess current is no longer the flowed increases as the temperature drop of 0 ℃ or less, the extra transistor Q 9 as a current having a complementary negative temperature characteristic and the temperature characteristic of the load of the mechanism, Q 10 and resistors
R 3 is set.
上記余分な電流はnpn形トランジスタQ7,Q8で構成され
る電流出力回路41から抵抗R1に流れ、基準電圧である抵
抗R1の両端電圧は０℃以下で温度低下に従って増大す
る。The extra current flows from the current output circuit 41 composed of the npn type transistors Q 7 and Q 8 to the resistor R 1 , and the voltage across the resistor R 1 which is the reference voltage increases below 0 ° C. as the temperature decreases.
このため、第１の基準電流源15による基準電圧は第３
図（Ａ）の破線Ｉに示す負の温度特性を持ち、第２の基
準電流源16による基準電圧は一点鎖線IIに示す負の温度
特性を持ち、差動増幅器17の非反転入力端子には実線II
Iに示す温度特性の基準電圧が供給される。Therefore, the reference voltage by the first reference current source 15 is the third reference voltage.
It has a negative temperature characteristic shown by a broken line I in FIG. 9A, the reference voltage by the second reference current source 16 has a negative temperature characteristic shown by a one-dot chain line II, and the non-inverting input terminal of the differential amplifier 17 has Solid line II
The reference voltage of the temperature characteristic shown in I is supplied.
この結果、直流モータ12の回転速度は第３図（Ｂ）の
実線に示す如く０℃以下でも略一定となる。図中、一点
鎖線Ｖは従来回路を用いた場合の特性である。As a result, the rotation speed of the DC motor 12 becomes substantially constant even at 0 ° C. or lower as shown by the solid line in FIG. In the figure, the alternate long and short dash line V is the characteristic when the conventional circuit is used.
第４図は本発明回路の第２実施例のブロック図を示
す。同図中、速度制御回路20内では第１の基準電流源15
の出力電流が第２の電圧・電流変換器51で電圧に変換さ
れて差動増幅器17の非反転入力端子に供給される。第２
の基準電流源16は直流モータ12の逆起電圧の検出側に設
けられおり、その出力電流は第３の電圧・電流変換器52
で電圧に変換されて逆起電圧から減算され、差動増幅器
17の非反転入力端子に供給される。FIG. 4 shows a block diagram of a second embodiment of the circuit of the present invention. In the figure, in the speed control circuit 20, the first reference current source 15
Is converted into a voltage by the second voltage / current converter 51 and supplied to the non-inverting input terminal of the differential amplifier 17. Second
The reference current source 16 is provided on the detection side of the counter electromotive voltage of the DC motor 12, and the output current thereof is the third voltage-current converter 52.
Is converted to a voltage by and subtracted from the back electromotive force, a differential amplifier
Supplied to 17 non-inverting input terminals.
この変形例でも第１の回路を同一の効果を得ることが
できる。Even in this modification, the same effect can be obtained with the first circuit.
発明の効果 上述の如く、本発明回路によれば、低温時に機構部に
よる負荷が増大しても一定速度で直流モータを回転させ
ることができ、実用上きわめて有用である。EFFECTS OF THE INVENTION As described above, according to the circuit of the present invention, the DC motor can be rotated at a constant speed even when the load of the mechanical section increases at low temperatures, which is extremely useful in practice.
【図面の簡単な説明】 第１図，第４図夫々は本発明回路の各実施例のブロック
図、第２図は第1,第２の基準電流源及び第１の電流・電
圧変換器の回路図、第３図は本発明を説明するための特
性図である。 10,20……速度制御回路、12……直流モータ、15……第
１の基準電流源、16……第２の基準電流源、17……差動
増幅器、50……第１の電流・電圧変換器、51,52……第
２の電流・電圧変換器。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 4 are block diagrams of respective embodiments of the circuit of the present invention, and FIG. 2 is a first reference current source and a second reference current source and a first current-voltage converter. A circuit diagram and FIG. 3 are characteristic diagrams for explaining the present invention. 10, 20 Speed control circuit, 12 DC motor, 15 First reference current source, 16 Second reference current source, 17 Differential amplifier, 50 First current Voltage converter, 51, 52 ... Second current / voltage converter.
Claims (2)
起電圧と基準電圧との誤差電圧に応じて該直流モータに
流す電流を制御し、該直流モータの回転速度を制御する
直流モータの速度制御回路において、 該直流モータの回転速度の温度特性と相補的な負の温度
特性を持ち後述の差動回路の一方のトランジスタのベー
ス電流を温度に応じて変化させる定電圧回路と、該定電
圧回路により一方のトランジスタのベース電流を可変さ
れ、該ベース電流に応じて他方のトランジスタのコレク
タ電流を変化させる差動回路と、該差動回路の他方のト
ランジスタのコレクタ電流に応じ温度低下により増大す
る第１の基準電流を出力する電流出力回路とを有する第
１の基準電流源と、 該機構部による負荷の温度特性と相補的な温度特性を持
つ電流を供給する電流供給回路と、該電流供給回路の供
給する電流を第２の基準電流として出力する電流出力回
路とを有する第２の基準電流源と、 該第１の基準電流源の出力する第１の基準電流と該第２
の基準電流源の出力する第２の基準電流との加算値を電
圧に変換する第１の電流・電圧変換器とを有し、 該第１の電流・電圧変換器の出力電圧を基準電圧として
該逆起電圧との誤差電圧を得ることを特徴とする直流モ
ータの速度制御回路。1. A DC motor for controlling a rotation speed of the DC motor, which controls a current flowing through the DC motor according to an error voltage between a counter electromotive voltage and a reference voltage of the DC motor for rotationally driving the mechanical section. In the speed control circuit, a constant voltage circuit having a negative temperature characteristic complementary to the temperature characteristic of the rotation speed of the DC motor and changing the base current of one transistor of a differential circuit described later according to the temperature, and the constant voltage circuit. A differential circuit in which the base current of one transistor is changed by a voltage circuit and the collector current of the other transistor is changed according to the base current, and the temperature is increased in accordance with the collector current of the other transistor of the differential circuit. And a first reference current source having a current output circuit for outputting a first reference current, and a current having a temperature characteristic complementary to the temperature characteristic of the load by the mechanism section. A second reference current source having a current supply circuit that outputs a current supplied from the current supply circuit as a second reference current, and a first reference current source that outputs the first reference current source. Reference current and the second
A first current / voltage converter for converting the added value with the second reference current output from the reference current source into a voltage, and using the output voltage of the first current / voltage converter as a reference voltage. A speed control circuit for a DC motor, characterized in that an error voltage from the back electromotive force is obtained.
起電圧と基準電圧との誤差電圧に応じて該直流モータに
流す電流を制御し、該直流モータの回転速度を制御する
直流モータの速度制御回路において、 該直流モータの回転速度の温度特性と相補的な負の温度
特性を持ち後述の差動回路の一方のトランジスタのベー
ス電流を温度に応じて変化させる定電圧回路と、該定電
圧回路により一方のトランジスタのベース電流を可変さ
れ、該ベース電流に応じて他方のトランジスタのコレク
タ電流を変化させる差動回路と、該差動回路の他方のト
ランジスタのコレクタ電流に応じ温度低下により増大す
る第１の基準電流を出力する電流出力回路とを有する第
１の基準電流源と、 該機構部による負荷の温度特性と相補的な温度特性を持
つ電流を供給する電流供給回路と、該電流供給回路の供
給する電流を第２の基準電流として出力する電流出力回
路とを有する第２の基準電流源と、 該第１の基準電流源の出力する第１の基準電流を電圧に
変換する第２の電流・電圧変換器と、 該第２の基準電流源の出力する第２の基準電流を電圧に
変換する第３の電流・電圧変換器とを有し、 該第２の電流・電圧変換器の出力電圧を基準電圧として
該第３の電流・電圧変換器の出力電圧を減算した該逆起
電圧との誤差電圧を得ることを特徴とする直流モータの
速度制御回路。2. A direct current motor for controlling a rotational speed of the direct current motor, which controls a current flowing through the direct current motor according to an error voltage between a counter electromotive voltage and a reference voltage of the direct current motor for rotationally driving the mechanical portion. In the speed control circuit, a constant voltage circuit having a negative temperature characteristic complementary to the temperature characteristic of the rotation speed of the DC motor and changing the base current of one transistor of a differential circuit described later according to the temperature, and the constant voltage circuit. A differential circuit in which the base current of one transistor is changed by a voltage circuit and the collector current of the other transistor is changed according to the base current, and the temperature is increased in accordance with the collector current of the other transistor of the differential circuit. And a first reference current source having a current output circuit for outputting a first reference current, and a current having a temperature characteristic complementary to the temperature characteristic of the load by the mechanism section. A second reference current source having a current supply circuit that outputs a current supplied from the current supply circuit as a second reference current, and a first reference current source that outputs the first reference current source. A second current / voltage converter for converting a reference current into a voltage; and a third current / voltage converter for converting a second reference current output from the second reference current source into a voltage, Speed of a DC motor characterized by obtaining an error voltage from the back electromotive force obtained by subtracting the output voltage of the third current-voltage converter with the output voltage of the second current-voltage converter as a reference voltage. Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63163548A JP2671396B2 (en) | 1988-06-30 | 1988-06-30 | DC motor speed control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63163548A JP2671396B2 (en) | 1988-06-30 | 1988-06-30 | DC motor speed control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0213290A JPH0213290A (en) | 1990-01-17 |
| JP2671396B2 true JP2671396B2 (en) | 1997-10-29 |
Family
ID=15775990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63163548A Expired - Fee Related JP2671396B2 (en) | 1988-06-30 | 1988-06-30 | DC motor speed control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2671396B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788008B (en) * | 2016-12-20 | 2019-06-04 | 北京经纬恒润科技有限公司 | A kind of control method and device of vehicle body closed system direct current generator |
| CN106712605B (en) * | 2017-01-25 | 2019-03-29 | 北京经纬恒润科技有限公司 | A kind of anti-clip control method and device |
-
1988
- 1988-06-30 JP JP63163548A patent/JP2671396B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0213290A (en) | 1990-01-17 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |