JPH0729760Y2 - Stepping motor drive circuit - Google Patents
Stepping motor drive circuitInfo
- Publication number
- JPH0729760Y2 JPH0729760Y2 JP1986070825U JP7082586U JPH0729760Y2 JP H0729760 Y2 JPH0729760 Y2 JP H0729760Y2 JP 1986070825 U JP1986070825 U JP 1986070825U JP 7082586 U JP7082586 U JP 7082586U JP H0729760 Y2 JPH0729760 Y2 JP H0729760Y2
- Authority
- JP
- Japan
- Prior art keywords
- step motor
- circuit
- capacitor
- current
- coil
- 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.)
- Expired - Lifetime
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- Control Of Stepping Motors (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案はステップモータ駆動回路に係り、駆動パルスを
生成してステップモータを回転駆動するステップモータ
駆動回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step motor drive circuit, and more particularly, to a step motor drive circuit that generates a drive pulse to rotationally drive a step motor.
従来の技術 第３図は従来のステップモータ駆動回路の一例の回路図
を示す。同図中、電源端子1a,1b間に印加される電圧は
トランジスタTR,抵抗R1，フェナーダイオードZDよりな
る定電圧回路で安定化されてモータ駆動用集積回路２の
電源端子2a,2bに印加される。2. Description of the Related Art FIG. 3 shows a circuit diagram of an example of a conventional step motor drive circuit. In the figure, the voltage applied between the power supply terminals 1a and 1b is stabilized by a constant voltage circuit composed of a transistor TR, a resistor R 1 and a phenor diode Z D , and the power supply terminals 2a and 2b of the motor drive integrated circuit 2 are stabilized. Applied to.
モータ駆動用集積回路２は水晶振動子３及びコンデンサ
C1，C2で決定される発振周波数の信号を分周して第４図
（Ａ）に示す如き矩形波の駆動パルス信号を生成し、こ
の駆動パルス信号を端子2c,2dよりステップモータ４に
供給する。コンデンサC0は駆動パルスの電圧を一定に保
持するためのものである。これによってステップモータ
４が１秒毎に所定角度だけ回転し、その回転軸に取付け
られた時計の指針が回転する。The motor driving integrated circuit 2 includes a crystal oscillator 3 and a capacitor.
A drive pulse signal of a rectangular wave as shown in FIG. 4 (A) is generated by dividing the signal of the oscillation frequency determined by C 1 and C 2 , and the drive pulse signal is supplied from the terminals 2c and 2d to the step motor 4 Supply to. The capacitor C 0 is for keeping the voltage of the drive pulse constant. As a result, the step motor 4 rotates by a predetermined angle every one second, and the hands of the timepiece attached to the rotating shaft rotate.
上記正極性又は負極性の駆動パルスのパルス幅はステッ
プモータ４が所定角度だけ回転する時間よりも大とされ
ており、駆動パルスによってステップモータ４のコイル
に流れる電流は第４図（Ｂ）に示す如くリンギングを含
んだ波形となる。The pulse width of the positive or negative polarity drive pulse is set to be larger than the time during which the step motor 4 rotates by a predetermined angle, and the current flowing through the coil of the step motor 4 by the drive pulse is shown in FIG. 4 (B). As shown, the waveform includes ringing.
このようにステップモータの電流波形にリンギングを生
じるのは、ステップモータ４の回転子及びこれによって
駆動される歯車等の慣性力により、回転子がその停止位
置を中心として振動し、回転子の振動による逆起電力が
生じるためである。The ringing of the current waveform of the step motor is caused by the inertial force of the rotor of the step motor 4 and gears driven by the rotor, which causes the rotor to vibrate around its stop position, thereby vibrating the rotor. This is because the counter electromotive force is generated by.
上記回転子の振動は歯車等の摩擦により減衰され、充分
に減衰して指針が所定角度位置に停止するまでステップ
モータ４のコイルに矩形波の駆動パルスが供給される。The vibration of the rotor is damped by the friction of the gears and the like, and a rectangular wave drive pulse is supplied to the coil of the step motor 4 until it is sufficiently damped and the pointer stops at a predetermined angle position.
考案が解決しようとする問題点 しかし、回転子が所定角度回転して振動を始めた後も、
ステップモータ４のコイルには矩形波の駆動パルスが供
給されているために、コイルに流れる電流は振動エネル
ギーとなり、回転子の振動が減衰して停止するまでの時
間が長くなる。このため、指針、特に秒針が長い間振動
して目視しにくく、また歯車等の摩擦により発生する騒
音が大であるという問題点があった。Problems to be solved by the invention However, even after the rotor rotates by a predetermined angle and starts to vibrate,
Since the rectangular-wave drive pulse is supplied to the coil of the step motor 4, the current flowing through the coil becomes vibration energy, and the time until the vibration of the rotor is attenuated and stopped becomes long. Therefore, there is a problem in that the hands, especially the second hand, vibrate for a long time and are hard to see, and the noise generated by the friction of the gears is large.
そこで、本考案は抵抗を設けることにより、上記の問題
点を解決したステップモータ駆動回路を提供することを
目的とする。Therefore, an object of the present invention is to provide a step motor drive circuit that solves the above problems by providing a resistor.
問題点を解決するための手段 本考案においては、定電圧回路と該集積回路の一方の電
源端子及び前記コンデンサとの接続点との間に前記ステ
ップモータのコイルの抵抗と前記集積回路の内部抵抗と
の和の略1/2以上で、かつ、２倍未満の抵抗値を有する
電流制限用の抵抗が設けられ、駆動パルスとしてステッ
プモータのコイルに供給される電流は、抵抗で制限され
た定電圧回路よりの電流と、コンデンサの静電容量とス
テップモータのコイル及び集積回路の抵抗値の時定数に
よりコンデンサが放電する電流とである。Means for Solving the Problems In the present invention, the resistance of the coil of the step motor and the internal resistance of the integrated circuit are provided between a constant voltage circuit and one power supply terminal of the integrated circuit and a connection point with the capacitor. The current supplied to the step motor coil as a drive pulse is provided with a current limiting resistor having a resistance value that is about 1/2 or more of the sum of They are the current from the voltage circuit, the current that the capacitor discharges due to the time constant of the capacitance of the capacitor and the resistance value of the coil of the step motor and the integrated circuit.
作用 本考案においては、ステップモータのコイルに供給され
る電流が、抵抗よりの電流にコンデンサの放電電流が加
算されたものであり、抵抗の値はステップモータのコイ
ルの抵抗と集積回路の内部抵抗との和の略1/2以上で、
かつ、２倍未満に設定することにより、回転子が所定角
度回転した後回転子の振動エネルギーとなる電流が従来
より大幅に少なく、回転子の振動が速く減衰する。Function In the present invention, the current supplied to the coil of the step motor is the sum of the current from the resistor and the discharge current of the capacitor, and the value of the resistance is the resistance of the coil of the step motor and the internal resistance of the integrated circuit. About half or more of the sum of
In addition, by setting it to less than twice, the current that becomes the vibration energy of the rotor after the rotor has rotated by a predetermined angle is significantly smaller than in the conventional case, and the vibration of the rotor is quickly attenuated.
実施例 第１図は本考案回路の一実施例の回路図を示す。同図
中、第３図と同一部分には同一符号を付し、その説明を
省略する。Embodiment FIG. 1 shows a circuit diagram of an embodiment of the circuit of the present invention. In the figure, those parts which are the same as those corresponding parts in FIG. 3 are designated by the same reference numerals, and a description thereof will be omitted.
第１図において、電源端子1a,1b間には例えば電源電圧1
2Vが印加される。ベースバイアス用の抵抗R1は例えば2.
2kΩとされ、ツェナーダイオードZDのツェナー電圧は例
えば7.5Vとされている。トランジスタTRのエミッタには
例えば330Ωの電流制限用の抵抗R0の一端が接続され、
その他端はモータ駆動用集積回路２の電源端子2aに接続
されている。また、モータ駆動用集積回路２の電源端子
2a,2b間に接続されたコンデンサC0の静電容量は例えば2
20μＦである。In FIG. 1, for example, the power supply voltage 1 is provided between the power supply terminals 1a and 1b.
2V is applied. The base bias resistor R 1 is 2.
The Zener voltage of the Zener diode Z D is set to 2 kΩ and 7.5 V, for example. To the emitter of the transistor TR, one end of a current limiting resistor R 0 of, for example, 330Ω is connected,
The other end is connected to the power supply terminal 2a of the motor driving integrated circuit 2. In addition, the power supply terminal of the motor driving integrated circuit 2
The capacitance of the capacitor C 0 connected between 2a and 2b is, for example, 2
It is 20 μF.
モータ駆動用集積回路２はＣ−MOS（コンプリメンタリ
ーMOS）構造の時計用集積回路であり、その内部抵抗は
正極性又は負極性の駆動パルス出力時に数10Ωで、駆動
パルス非出力時に数10kΩである。また、モータ駆動用
集積回路２の端子2c,2dに接続されたステップモータ４
のコイルの直流抵抗は例えば、330Ωである。The motor driving integrated circuit 2 is a timepiece integrated circuit having a C-MOS (complementary MOS) structure, and its internal resistance is several tens Ω when a positive or negative driving pulse is output and several tens kΩ when the driving pulse is not output. is there. Further, the step motor 4 connected to the terminals 2c and 2d of the motor driving integrated circuit 2
The DC resistance of the coil is, for example, 330Ω.
次に回路動作について説明する。駆動パルス非出力時つ
まりステップモータ４のコイルに電流が流れないときに
は、モータ駆動用集積回路２の内部抵抗が抵抗R0に対し
て充分大であるため、コンデンサC0が充電される。Next, the circuit operation will be described. When the drive pulse is not output, that is, when no current flows in the coil of the step motor 4, the internal resistance of the motor driving integrated circuit 2 is sufficiently larger than the resistance R 0 , so that the capacitor C 0 is charged.
正極性又は負極性の駆動パルスが生成されてステップモ
ータ４のコイルに電流が流れ始めると、モータ駆動用集
積回路２の端子2c又は2dのいずれか高い方の端子の電位
が急激に低下し、トランジスタTRより抵抗R0を通った電
流が端子2aに流入すると共に、コンデンサC0の放電電流
が端子2aに流入する。コンデンサC0の放電時定数はその
静電容量と、モータ駆動用集積回路２の内部抵抗（数10
Ω）及びステップモータ４のコイルの直流抵抗（330
Ω）の和とにより決定される。When a positive or negative drive pulse is generated and a current starts to flow in the coil of the step motor 4, the potential of the terminal higher than the terminal 2c or 2d of the motor drive integrated circuit 2 suddenly drops, The current flowing through the resistor R 0 from the transistor TR flows into the terminal 2a, and the discharge current of the capacitor C 0 flows into the terminal 2a. The discharge time constant of the capacitor C 0 depends on its capacitance and the internal resistance of the motor driving integrated circuit 2 (10
Ω) and the DC resistance of the coil of the step motor 4 (330
Ω) and the sum.
端子2c又は2dのいずれか高い方の端子の電位と端子2aの
電位とが一致するとコンデンサC0の放電が停止し、この
後駆動パルスが生成されているだけの期間端子2aには抵
抗R0を通った電流のみが流入する。このようにして、端
子2c,2dより出力される駆動パルス信号の電圧は第２図
（Ａ）に示す如く、正極性の駆動パルスが略6.8Vまで急
激に立上がった後徐々に低下して例えば6V程度となった
後、急激にOVまで立下がり、負極性駆動パルスがその反
転した波形となる。When the potential of the higher one of the terminals 2c and 2d and the potential of the terminal 2a match, the discharge of the capacitor C 0 is stopped, and thereafter, the resistor R 0 is applied to the terminal 2a only during the period when the drive pulse is generated. Only the current that has passed through flows in. In this way, the voltage of the drive pulse signal output from the terminals 2c and 2d gradually decreases after the positive drive pulse rises up to about 6.8V as shown in FIG. 2 (A). For example, after reaching about 6V, it rapidly drops to OV, and the negative drive pulse has its inverted waveform.
これに従って、駆動パルスによりステップモータ４のコ
イルに流れる電流は第２図（Ｂ）に示す如き波形とな
る。第２図（Ｂ）において値i1〔Ａ〕以下の左下がり斜
線部は抵抗R0を通って供給される電流であり、値i
1〔Ａ〕を超える右下がり斜線部はコンデンサC0の放電
電流である。Accordingly, the current flowing through the coil of the step motor 4 due to the drive pulse has a waveform as shown in FIG. 2 (B). In FIG. 2 (B), the shaded area on the lower left below the value i 1 [A] is the current supplied through the resistor R 0 , and the value i
The shaded area on the lower right that exceeds 1 [A] is the discharge current of the capacitor C 0 .
このようにステップモータ４のコイルに流れる電流は、
回転子が所定角度回転した後徐々に低下するので、回転
子の振動エネルギーは従来より大幅に小さくなり、その
分だけ速く回転子の振動が減衰して停止する。このた
め、秒針が目視しやすくなり、また歯車等の摩擦により
発生する騒音も従来より1.6dB程度低減する。Thus, the current flowing through the coil of the step motor 4 is
Since the rotor gradually decreases after rotating by a predetermined angle, the vibration energy of the rotor becomes significantly smaller than in the conventional case, and the vibration of the rotor is damped faster and stopped. For this reason, the second hand is easier to see, and the noise generated by friction of gears etc. is also reduced by about 1.6 dB compared to the conventional one.
ところで、抵抗R0の定数をモータ駆動回路２の内部抵抗
及びステップモータ４のコイル直流抵抗の和の略1/2
（≒100Ω）未満とすると、第２図（Ｂ）に示す値i1が
高くなって振動エネルギーが大となり、また、抵抗R0の
定数を上記の和の２倍（≒800Ω）以上とするとモータ
駆動回路２が正常動作を行なわないので、抵抗R0はこれ
らの値の範囲内で選定される。By the way, the constant of the resistance R 0 is approximately 1/2 of the sum of the internal resistance of the motor drive circuit 2 and the DC resistance of the coil of the step motor 4.
If it is less than (≈100Ω), the value i 1 shown in FIG. 2 (B) becomes high and the vibration energy becomes large, and if the constant of the resistance R 0 is twice the above sum (≈800Ω) or more. Since the motor drive circuit 2 does not operate normally, the resistance R 0 is selected within the range of these values.
考案の効果 上述の如く、本考案回路は、回転子が所定角度回転した
後、回転子の振動エネルギーとなる電流が従来より大幅
に少なく、回転子の振動が速く減衰して停止し、秒針等
の指針が目視しやすくなり、かつ歯車等の摩擦により発
生する騒音が低減される等の特長を有している。Effect of the Invention As described above, in the circuit of the present invention, after the rotor rotates by a predetermined angle, the electric current that becomes the vibration energy of the rotor is significantly smaller than the conventional one, the vibration of the rotor is quickly damped and stopped, and the second hand etc. The pointers are easy to see, and the noise generated by friction of gears is reduced.
第１図は本考案回路の一実施例の回路図、第２図は第１
図示の回路の動作説明用波形図、第３図は従来回路の一
例の回路図、第４図は第３図示の回路の動作説明用波形
図である。 ２…モータ駆動用集積回路、2a〜2c…端子、４…ステッ
プモータ、C0…コンデンサ、ZD…ツェナーダイオード、
R1，R0…抵抗、TR…トランジスタ。FIG. 1 is a circuit diagram of an embodiment of the circuit of the present invention, and FIG.
FIG. 3 is a waveform diagram for explaining the operation of the illustrated circuit, FIG. 3 is a circuit diagram of an example of a conventional circuit, and FIG. 4 is a waveform diagram for explaining the operation of the circuit shown in FIG. 2 ... Motor driving integrated circuit, 2 a to 2 c ... terminal, 4 ... stepping motor, C 0 ... capacitor, Z D ... Zener diode,
R 1 , R 0 ... Resistors, TR ... Transistors.
Claims (1)
と、コンデンサを並列に接続された一対の電源端子間に
該定電圧回路の出力電圧を供給されてステップモータを
回転せしめるための駆動パルスを生成する集積回路とよ
りなるステップモータ駆動回路において、 該定電圧回路と該集積回路の一方の電源端子及び前記コ
ンデンサとの接続点との間に前記ステップモータのコイ
ルの抵抗と前記集積回路の内部抵抗との和の略1/2以上
で、かつ、２倍未満の抵抗値を有する電流制限用の抵抗
を設けてなり、 該駆動パルスとして該ステップモータのコイルに供給す
る電流を、該抵抗で制限された定電圧回路よりの電流
と、該コンデンサの静電容量と該コイル及び集積回路の
抵抗値の時定数による該コンデンサの放電電流とで、供
給するよう構成したステップモータ駆動回路。1. A drive for rotating a step motor by supplying an output voltage of the constant voltage circuit between a constant voltage circuit for stabilizing and outputting a power supply voltage and a pair of power supply terminals connected in parallel with a capacitor. A step motor drive circuit including an integrated circuit for generating a pulse, wherein a resistance of a coil of the step motor and the integrated circuit are provided between the constant voltage circuit and a connection point between one power supply terminal of the integrated circuit and the capacitor. A resistor for limiting current, which has a resistance value that is approximately ½ or more of the sum of the internal resistance of the step motor and less than twice, and supplies the current to be supplied to the coil of the step motor as the drive pulse. The current is supplied from a constant voltage circuit limited by a resistance, the electrostatic capacity of the capacitor and the discharge current of the capacitor due to the time constant of the resistance value of the coil and the integrated circuit are configured to be supplied. Step motor drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986070825U JPH0729760Y2 (en) | 1986-05-12 | 1986-05-12 | Stepping motor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986070825U JPH0729760Y2 (en) | 1986-05-12 | 1986-05-12 | Stepping motor drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62182099U JPS62182099U (en) | 1987-11-18 |
| JPH0729760Y2 true JPH0729760Y2 (en) | 1995-07-05 |
Family
ID=30912812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986070825U Expired - Lifetime JPH0729760Y2 (en) | 1986-05-12 | 1986-05-12 | Stepping motor drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729760Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5558794A (en) * | 1978-10-27 | 1980-05-01 | Jeco Co Ltd | Driving system for step motor |
-
1986
- 1986-05-12 JP JP1986070825U patent/JPH0729760Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62182099U (en) | 1987-11-18 |
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