JPS63249485A - Speed signal detection circuit for electromagnetic driver - Google Patents
Speed signal detection circuit for electromagnetic driverInfo
- Publication number
- JPS63249485A JPS63249485A JP62082664A JP8266487A JPS63249485A JP S63249485 A JPS63249485 A JP S63249485A JP 62082664 A JP62082664 A JP 62082664A JP 8266487 A JP8266487 A JP 8266487A JP S63249485 A JPS63249485 A JP S63249485A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- drive
- speed signal
- voltage
- speed
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims description 21
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
Landscapes
- Control Of Linear Motors (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はボイスコイル型モーター、ブリッジ制御モータ
ー等の電磁駆動装置の速度信号検出回路に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a speed signal detection circuit for an electromagnetic drive device such as a voice coil type motor or a bridge control motor.
（従来の技術）
従来、電磁駆動装置の速度信号検出回路とし−ては速度
検出コイルを用いない第２図に示すようなものがある。(Prior Art) Conventionally, there is a speed signal detection circuit for an electromagnetic drive device as shown in FIG. 2, which does not use a speed detection coil.
図中りは１コイルタイプのボイスコイル型モーター、円
筒サーボモーター等の電磁駆動装置における駆動コイル
、Ｒは駆動電流検出抵抗、Ｒ１は駆動出力検出抵抗、Ｃ
工は駆動出力検出コンデンサー、 ＶＲ□、ＶＲ，は半
固定抵抗、１１は駆動コイルＬを駆動して移動させる出
力回路、 １２は演算回路である。The figure shows a drive coil in an electromagnetic drive device such as a single-coil type voice coil motor or a cylindrical servo motor, R is a drive current detection resistor, R1 is a drive output detection resistor, and C
1 is a drive output detection capacitor, VR□ and VR are semi-fixed resistors, 11 is an output circuit that drives and moves the drive coil L, and 12 is an arithmetic circuit.
ここで複素変数をＳ、駆動コイルＬの抵抗成分の伝達関
数をＧ （ｓ）い抵抗Ｒ□およびコンデンサー０１の直
列回路におけるコンデンサー〇、の伝達関数をＧ （ｓ
）２としてＬ／Ｒ＝Ｃ，Ｒ，＝Ｔなる条件を満足するよ
うに設定すれば
となり、Ｇ （ｓ）１＝ Ｇ （ｓ）ｚとなって駆動電
流と逆起電圧をコンデンサーＣ１と抵抗Ｒ１によって分
離することができ、電磁駆動装置の静止状態では駆動電
流検出抵抗Ｒの両端電圧をｅｇ、インダクタンスＬによ
る逆起電圧をｅＬ、駆動出力検出抵抗Ｒ０の両端電圧を
ｅ、い駆動出力検出コンデンサーの両端電圧をｅ、□と
すると、
ｅＬ ： ｅＲ１９ｅＱ ： ｅＣ１
になる。一方速度信号は電磁駆動装置の磁気回路内の導
体、すなわち駆動コイルに発生していることになる。い
ま電磁駆動装置（駆動コイル）の速度に比例した速度信
号電圧ｅ□を抵抗Ｒに生じさせる速度比例電流をＩＲ１
駆動出力回路２１の出力インピーダンスおよび出力電圧
をｒｉおよびｅｉ、駆動コイルの直流抵抗をｒｌ、電磁
駆動装置の磁気回路の磁束密度をＢ、駆動コイルの有効
長をＱ、駆動コイルの速度をＶとすると、ｅ工＝Ｂ１２
ｖとなり、電磁駆動装置の駆動状態ではインピーダンス
ｒｉが極めて小さいとすれば駆動電流検出抵抗Ｒの両端
電圧はｅｌが加算されてｅｐ＋ｅ□＝ｅ’ｇ になる。Here, the complex variable is S, the transfer function of the resistance component of the drive coil L is G (s), the transfer function of the capacitor 〇 in the series circuit of the resistor R□ and the capacitor 01 is G (s
)2, if the conditions are set to satisfy L/R=C,R,=T, then G(s)1=G(s)z, and the drive current and back electromotive force are changed by capacitor C1 and resistor. When the electromagnetic drive device is at rest, the voltage across the drive current detection resistor R is eg, the back electromotive force due to the inductance L is eL, and the voltage across the drive output detection resistor R0 is e, and the drive output is detected. If the voltages across the capacitor are e and □, then eL: eR19eQ: eC1. On the other hand, the speed signal is generated in the conductor in the magnetic circuit of the electromagnetic drive device, that is, in the drive coil. Now, the speed proportional current that causes a speed signal voltage e□ proportional to the speed of the electromagnetic drive device (drive coil) to be generated in the resistor R is IR1.
The output impedance and output voltage of the drive output circuit 21 are ri and ei, the DC resistance of the drive coil is rl, the magnetic flux density of the magnetic circuit of the electromagnetic drive device is B, the effective length of the drive coil is Q, and the speed of the drive coil is V. Then, e-work=B12
If the impedance ri is extremely small in the driving state of the electromagnetic drive device, the voltage across the drive current detection resistor R is ep+e□=e'g by adding el.
従って演算回路１２によってｅ’（ｚ ｅｔ□の演算
をすればｅユが得られる。Therefore, if the calculation circuit 12 calculates e'(z et□, eU can be obtained.
（発明が解決しようとする問題点）
この電磁駆動装置の速度信号検出回路では駆動出力回路
１１で駆動コイルＬの速度に応じた速度起電力Ｅｙは駆
動コイルＬと駆動電流検出抵抗Ｒに電流を流す結果とな
り、最終的に駆動電流検出抵抗Ｒの両端に現われた電圧
を用いて上述の如く速度信号を検出することになる。し
かし実際には駆動コイルＬの抵抗分Ｒ６はＲＬ ＞ ＞
Ｒであるので、駆動電流検出抵抗Ｒの電圧検出効率（
速度起電力検出効率）が非常に悪くて駆動コイルＬの速
度信号が大きく減衰してしまう。(Problems to be Solved by the Invention) In the speed signal detection circuit of this electromagnetic drive device, the speed electromotive force Ey corresponding to the speed of the drive coil L is generated in the drive output circuit 11 by applying a current to the drive coil L and the drive current detection resistor R. As a result, the voltage finally appearing across the drive current detection resistor R is used to detect the speed signal as described above. However, in reality, the resistance R6 of the drive coil L is RL>>
Since R, the voltage detection efficiency of the drive current detection resistor R (
The speed electromotive force detection efficiency) is very poor, and the speed signal of the drive coil L is greatly attenuated.
（問題点を解決するための手段）
本発明は定電流駆動回路に電磁駆動装置の駆動コイルを
接続し、かつ高入力インピーダンス増幅器、駆動コイル
のインダクタンスおよび直流抵抗とによる電圧伝達特性
とほぼ同一の伝達特性を有するＲＣローパスフィルター
を備えている。(Means for Solving the Problems) The present invention connects a drive coil of an electromagnetic drive device to a constant current drive circuit, and has almost the same voltage transfer characteristics due to a high input impedance amplifier, inductance of the drive coil, and DC resistance. It is equipped with an RC low-pass filter having transfer characteristics.
（作 用）
本発明は駆動コイルの端子電圧を高入力インピーダンス
増幅器を用いて検出し、該検出電圧をＲＣローパスフィ
ルターを通して検出した検出電圧と定電流駆動回路の入
力電圧とを比較演算して駆動コイルの速度信号を検出す
る。(Function) The present invention detects the terminal voltage of the drive coil using a high input impedance amplifier, and compares the detected voltage detected through an RC low-pass filter with the input voltage of the constant current drive circuit to drive the coil. Detect the coil speed signal.
（実施例） 第１図は本発明の一実施例を示す。(Example) FIG. 1 shows an embodiment of the invention.
この実施例は駆動出力回路を定電流駆動回路として高効
率で速度起電力を検出するものであり、その定電流駆動
回路１３は演算増幅器Ａ工および駆！ＰＩＩ電流検出抵
抗Ｒ２、抵抗Ｒ３，Ｒ４により構成されていて電磁駆動
装置の駆動コイルしに入力電圧Ｖｉに比例した電流を供
給する。ＲＣローパスフィルター１４は駆動コイルＬの
インダクタンスおよび直流抵抗とによる電圧伝達特性と
ほぼ同一の伝達特性を有するものであり、抵抗Ｒ５〜Ｒ
７とコンデンサー〇２〜Ｃ４により構成される。駆動コ
イルＬを定電流駆動回路１３で駆動した場合定電流駆動
回路１３の等価インピーダンスが無限大となるので、駆
動コイルＬに発生する速度起電力ＥｖはそのままＰ２点
に現われる。この２１点の電圧は高入力インピーダンス
増幅器Ａ２により引き出され、駆動コイルＬ／駆動電流
検出抵抗Ｒ２の効果による波形歪を補正する（伝達特性
を合わせる） ＲＣローパスフィルター１４を通して駆
動コイルＬの駆動電流波形と同一の波形となる。このＲ
Ｃローパスフィルター１６の出力信号は演算増幅器Ａ３
および抵抗Ｒ。In this embodiment, the speed electromotive force is detected with high efficiency by using a constant current drive circuit as the drive output circuit, and the constant current drive circuit 13 includes an operational amplifier A and a drive! It is composed of a PII current detection resistor R2, resistors R3 and R4, and supplies a current proportional to the input voltage Vi to the drive coil of the electromagnetic drive device. The RC low-pass filter 14 has almost the same voltage transfer characteristics as the inductance and DC resistance of the drive coil L, and has resistors R5 to R.
7 and capacitors 〇2 to C4. When the drive coil L is driven by the constant current drive circuit 13, the equivalent impedance of the constant current drive circuit 13 becomes infinite, so the speed electromotive force Ev generated in the drive coil L appears as it is at the point P2. The voltages at these 21 points are extracted by the high input impedance amplifier A2, and the waveform distortion due to the effect of the drive coil L/drive current detection resistor R2 is corrected (to match the transfer characteristics).The drive current waveform of the drive coil L is passed through the RC low-pass filter 14. The waveform is the same as that of This R
The output signal of the C low-pass filter 16 is sent to the operational amplifier A3.
and resistance R.
〜Ｒ０１からなる加算回路１７にて入力電圧Ｖｉが逆相
で加算され、つまり入力電圧Ｖｉが打ち消され、これに
より駆動コイルＬの印加電圧が打ち消されて速度起電力
Ｅｖによる速度信号のみが取り出される。In the adder circuit 17 consisting of ~R01, the input voltage Vi is added in reverse phase, that is, the input voltage Vi is canceled, thereby canceling the voltage applied to the drive coil L, and only the speed signal due to the speed electromotive force Ev is taken out. .
この実施例では従来のような速度信号の減衰が無く、駆
動コイルＬに現われた速度起電力Ｅｖによる信号電圧を
をそのまま後段に伝えることができ、Ｓ／Ｎや増幅器の
ドリフト等の面で有利となる。In this embodiment, there is no attenuation of the speed signal as in the conventional case, and the signal voltage due to the speed electromotive force Ev appearing in the drive coil L can be directly transmitted to the subsequent stage, which is advantageous in terms of S/N and amplifier drift. becomes.
なお本発明はボイスコイル型モーターに限らずブリッジ
制御モーター等の電ｍ駆動装置においてもその速度信号
検出回路に上記実施例と同様に実施することができる。Note that the present invention is not limited to voice coil type motors, but can also be implemented in the speed signal detection circuit of electric drive devices such as bridge control motors in the same manner as in the above embodiments.
（発明の効果）
以上のように本発明によれば電磁駆動装置の駆動コイル
を定電流駆動回路で駆動して駆動コイルに発生する速度
起電力による速度信号を高入力インピーダンス増幅器を
用いてそのまま取り出すので、駆動コイルの速度信号を
高い効率で検出することができる。(Effects of the Invention) As described above, according to the present invention, the drive coil of an electromagnetic drive device is driven by a constant current drive circuit, and the speed signal due to the speed electromotive force generated in the drive coil is directly extracted using a high input impedance amplifier. Therefore, the speed signal of the drive coil can be detected with high efficiency.
第１図は本発明の一実施例を示す回路図、第２図は従来
の電磁駆動装置の速度信号検出回路を示す回路図である
。
Ｌ・・・駆動コイル、１３・・・定電流駆動回路、１４
・・・ＲＣローパスフィルター、Ａ２・・・高入力イン
ピーダンス増幅器。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a speed signal detection circuit of a conventional electromagnetic drive device. L... Drive coil, 13... Constant current drive circuit, 14
...RC low-pass filter, A2...high input impedance amplifier.
Claims (1)
該駆動コイルの端子電圧を高入力インピーダンス増幅器
を用いて検出し、該検出電圧を駆動コイルのインダクタ
ンスおよび直流抵抗とによる電圧伝達特性とはほぼ同一
の伝達特性を有するＲＣローパスフィルターを通して検
出した検出電圧と上記定電流駆動回路の入力電圧とを比
較演算して上記駆動コイルの速度信号を検出するように
した電磁駆動装置の速度信号検出回路。Connect the drive coil of the electromagnetic drive device to the constant current drive circuit,
A detected voltage is obtained by detecting the terminal voltage of the drive coil using a high input impedance amplifier, and passing the detected voltage through an RC low-pass filter having almost the same voltage transfer characteristic as the voltage transfer characteristic due to the inductance and DC resistance of the drive coil. A speed signal detection circuit for an electromagnetic drive device, which detects a speed signal of the drive coil by comparing and calculating the input voltage of the constant current drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62082664A JP2637729B2 (en) | 1987-04-03 | 1987-04-03 | Speed signal detection circuit of electromagnetic drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62082664A JP2637729B2 (en) | 1987-04-03 | 1987-04-03 | Speed signal detection circuit of electromagnetic drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63249485A true JPS63249485A (en) | 1988-10-17 |
| JP2637729B2 JP2637729B2 (en) | 1997-08-06 |
Family
ID=13780701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62082664A Expired - Lifetime JP2637729B2 (en) | 1987-04-03 | 1987-04-03 | Speed signal detection circuit of electromagnetic drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2637729B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007151244A (en) * | 2005-11-24 | 2007-06-14 | Nippon Signal Co Ltd:The | Synchronous timing detector of electromagnetic actuator |
-
1987
- 1987-04-03 JP JP62082664A patent/JP2637729B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007151244A (en) * | 2005-11-24 | 2007-06-14 | Nippon Signal Co Ltd:The | Synchronous timing detector of electromagnetic actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2637729B2 (en) | 1997-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2923307B2 (en) | Current sensor | |
| JPS63249485A (en) | Speed signal detection circuit for electromagnetic driver | |
| JP2004053528A (en) | Current detecting circuit | |
| US5539356A (en) | DC coupled amplifier fed by an RF detector | |
| JPS6283613A (en) | Bearing computing apparatus | |
| JPS5894219A (en) | Filter circuit | |
| JPS6146566A (en) | Absolute value circuit | |
| US3965410A (en) | A.C. potentiometer with bridge having voltage controllable devices | |
| JP2594939B2 (en) | Speed signal detection circuit of electromagnetic drive | |
| JPH0639312Y2 (en) | Temperature detection circuit | |
| US4353017A (en) | Velocity compensation for limited displacement motors | |
| US3273071A (en) | Magnetic amplifier | |
| SU143908A1 (en) | Method of compensation of parasitic emf induced in the hall emf sensor circuit | |
| JPS62263704A (en) | Current drive circuit | |
| JPH04322169A (en) | Discharge lamp lighting apparatus | |
| JP2757637B2 (en) | Cross-coil instrument | |
| JP2626191B2 (en) | AMI signal receiving circuit | |
| JPS60675Y2 (en) | Signal addition circuit | |
| SU1638714A1 (en) | Controlled current source | |
| JPH01103168A (en) | Pulse width modulated wave generation circuit | |
| SU928322A1 (en) | Dc voltage pulse stabilizer | |
| JPH0724003B2 (en) | Constant current drive | |
| SU981897A1 (en) | Inductive voltage divider | |
| JP2684195B2 (en) | Pulse pattern output circuit | |
| JP2894754B2 (en) | Toner density sensor |