JPH0813193B2 - Motor control device - Google Patents

Motor control device

Info

Publication number
JPH0813193B2
JPH0813193B2 JP61273305A JP27330586A JPH0813193B2 JP H0813193 B2 JPH0813193 B2 JP H0813193B2 JP 61273305 A JP61273305 A JP 61273305A JP 27330586 A JP27330586 A JP 27330586A JP H0813193 B2 JPH0813193 B2 JP H0813193B2
Authority
JP
Japan
Prior art keywords
voltage
circuit
rotation speed
control
motor
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 - Fee Related
Application number
JP61273305A
Other languages
Japanese (ja)
Other versions
JPS63129874A (en
Inventor
敬雄 徳南
弘 武智
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP61273305A priority Critical patent/JPH0813193B2/en
Publication of JPS63129874A publication Critical patent/JPS63129874A/en
Publication of JPH0813193B2 publication Critical patent/JPH0813193B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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、モータ起動時の過大な突入電流を防止する
モータ制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device that prevents an excessive inrush current when starting a motor.

従来の技術 一般に直流モータの回転数を制御するには、供給電圧
を可変する手段がとられ、最近では効率の良いことから
電源電圧をパルス幅変調して制御する、いわゆるスイッ
チングレギュレータ方式が用いられることが多い。
2. Description of the Related Art In general, in order to control the rotation speed of a DC motor, a means for varying the supply voltage is used. Recently, a so-called switching regulator method, which controls the power supply voltage by pulse width modulation, is used because of its high efficiency. Often.

第2図は従来のスイッチングレギュレータ方式のモー
タ制御装置を示す構成図で、1は鋸歯状波発生回路、2
はパルス幅制御回路、3は駆動回路、4は前置増幅回路
である。パルス幅制御回路2は鋸歯状波発生回路1の出
力鋸歯状波を回転数制御電圧をしきい値レベルとして打
ち抜き、波形整形動作をすることで回転数制御電圧に比
例したパルス幅をもつパルス信号を作り出している。駆
動回路3は、パルス幅制御回路2の出力パルス信号を入
力としてスイッチング動作を行い、電源電圧をパルス幅
変調している。駆動回路3の出力部分には大容量のコン
デンサーを備え、パルス電圧を積分化することでパルス
幅に比例した出力電圧をつくり、モータ5の回転数を電
圧制御している。前置増幅回路4は、差動増幅器で構成
され、回転数制御電圧をパルス幅制御回路2の入力レベ
ルに適した値に増幅すると共に負入力側にフィードバッ
ク電圧を供給することでフィードバック制御を可能にし
ている。図中6はモータ5の回転数を検出する検知装置
で前置増幅回路4にフィードバックするものである。7
は電源回路である。
FIG. 2 is a configuration diagram showing a conventional switching regulator type motor control device, in which 1 is a sawtooth wave generation circuit and 2 is a sawtooth wave generation circuit.
Is a pulse width control circuit, 3 is a drive circuit, and 4 is a preamplification circuit. The pulse width control circuit 2 punches out the sawtooth wave output from the sawtooth wave generation circuit 1 by using the rotation speed control voltage as a threshold level, and performs a waveform shaping operation to obtain a pulse signal having a pulse width proportional to the rotation speed control voltage. Is producing. The drive circuit 3 receives the output pulse signal of the pulse width control circuit 2 as an input, performs a switching operation, and performs pulse width modulation of the power supply voltage. The output portion of the drive circuit 3 is provided with a large-capacity capacitor, and by integrating the pulse voltage, an output voltage proportional to the pulse width is created, and the rotation speed of the motor 5 is voltage-controlled. The preamplifier circuit 4 is composed of a differential amplifier and amplifies the rotation speed control voltage to a value suitable for the input level of the pulse width control circuit 2 and supplies feedback voltage to the negative input side for feedback control. I have to. Reference numeral 6 in the figure is a detection device for detecting the number of rotations of the motor 5 and is fed back to the preamplification circuit 4. 7
Is a power supply circuit.

発明が解決しようとする問題点 しかし従来の構成では、モータ起動時には直流モータ
特有の大きな突入電流が回路を流れ、これに対処するに
は回路素子の電流定格を大きくする必要があった。特に
フィードバック制御時には前置増幅回路4の利得を大き
く設定するために、制御系の遅れ時間によって生ずるフ
ィードバック入力立ちあがり不足の間は、前置増幅回路
4は最大駆動に近い状態にあり、従ってモータに印加さ
れる電圧が最大に近く、さらに大きな突入電流が流れる
という問題があった。
Problems to be Solved by the Invention However, in the conventional configuration, a large inrush current peculiar to the DC motor flows through the circuit at the time of starting the motor, and in order to cope with this, it is necessary to increase the current rating of the circuit element. In particular, during feedback control, since the gain of the preamplifier circuit 4 is set to a large value, the preamplifier circuit 4 is in a state close to the maximum drive during the shortage of the feedback input rising caused by the delay time of the control system, and therefore the motor is not driven. There is a problem that the applied voltage is close to the maximum and a larger inrush current flows.

本発明は上記問題点を解決するために、モータの起動
信号に連動して前置増幅回路の基準動作点電圧を可変す
ることで回転数制御電圧を漸増制御し、モータの突入電
流を低減することのできるモータ制御装置を提供するこ
とを目的とする。
In order to solve the above-mentioned problems, the present invention controls the rotational speed control voltage gradually by changing the reference operating point voltage of the preamplifier circuit in conjunction with the motor start signal to reduce the inrush current of the motor. An object of the present invention is to provide a motor control device capable of performing the above.

問題点を解決するための手段 上記目的を達成するために本発明のモータ制御装置
は、入力パルス信号のパルス幅に比例して出力電圧を変
化させ、モータの回転数を制御する駆動回路と、制御パ
ルス信号の信号源となる鋸歯状波発生回路と、前記鋸歯
状波発生回路の出力鋸歯状波と回転数補正電圧とを比較
し、鋸歯状波を回転数補正電圧に比例したパルス幅をも
つパルス信号に変換し、前記駆動回路の入力として供給
するパルス幅制御回路と、モータの回転数に比例した直
流電圧を発生する回転数検知装置と、前記回転数検知装
置の直流電圧と回転数制御電圧の差分を増幅してフィー
ドバック制御を行う前置増幅回路と、前記前置増幅回路
の基準動作電圧をモータ起動信号に連動してCR回路によ
って漸増し、前記前置増幅回路から供給する出力信号を
低電圧から漸増し、CR時定数後に前記回転数制御電圧に
相当した回転数補正電圧に制御するソフトスタート回路
を備えたものである。
Means for Solving the Problems In order to achieve the above object, a motor control device of the present invention changes a output voltage in proportion to a pulse width of an input pulse signal, and a drive circuit for controlling a rotation speed of a motor. The sawtooth wave generating circuit that is the signal source of the control pulse signal is compared with the output sawtooth wave of the sawtooth wave generating circuit and the rotation speed correction voltage, and the sawtooth wave has a pulse width proportional to the rotation speed correction voltage. A pulse width control circuit that converts the pulse signal into a pulse signal and supplies it as an input to the drive circuit; a rotation speed detection device that generates a DC voltage proportional to the rotation speed of the motor; and a DC voltage and rotation speed of the rotation speed detection device. A preamplifier circuit that amplifies the difference in control voltage to perform feedback control, and a reference operating voltage of the preamplifier circuit that is gradually increased by a CR circuit in conjunction with a motor start signal, and an output supplied from the preamplifier circuit No. was increasing from a low voltage, but having a soft start circuit for controlling the rotational speed correction voltage corresponding to the rotation speed control voltage after the CR time constant.

作用 本発明は上記した構成により、前置増幅器の基準動作
電圧をモータ起動信号に連動してCR回路によって漸増
し、前記前置増幅器から供給する出力信号を低電圧から
漸増させるため、モータは低電圧より起動し、過大な突
入電流を防止する。又、CR時定数後は基準電位は定常値
を保持するため、回転数補正電圧は回転数制御電圧と回
転数検知装置の出力電圧の差分で制御され、通常のフィ
ードバック制御に移行する。
With the above configuration, the present invention gradually increases the reference operating voltage of the preamplifier by the CR circuit in conjunction with the motor start signal, and gradually increases the output signal supplied from the preamplifier from a low voltage, so that the motor is low. Start from voltage to prevent excessive inrush current. Further, since the reference potential maintains a steady value after the CR time constant, the rotation speed correction voltage is controlled by the difference between the rotation speed control voltage and the output voltage of the rotation speed detection device, and shifts to normal feedback control.

実施例 第1図は本発明の一実施例を示す構成図で、第2図の
従来例のモータ制御装置と同一機能を有する構成要素に
は同一符号を付与し詳細な説明を省略する。8はソフト
スタート回路全体を示し、9はモータ起動信号に連動す
る開閉器、10は基準電源、11はコンデンサ、12は抵抗、
13はダイオードである。開閉器9はモータ停止時は閉路
しており、モータ起動信号に連動して開路すると、コン
デンサ11は基準電源10により充電され、その電圧は抵抗
12の抵抗値とコンデンサ11の容量できまる時定数式に従
い漸増する。前置増幅回路4内にある演算増幅器41の基
準動作点電圧は正入力端子の電圧できまり、正入力端子
はコンデンサ11に接読されているため、基準動作点電圧
も漸増し、結果として回転数制御電圧が漸増する。この
ためパルス幅制御回路2は、鋸歯状波発生回路1の出力
鋸歯状波を低しきい値レベルから打ち抜き初め、回転数
制御電圧の漸増と共にしきい値レベルを高め、除々にパ
ルス幅を拡大していき、駆動回路3の出力電圧は低電位
よりスタートし、パルス幅の拡大に比例して除々に電圧
が上昇するので過大な突入電流を防止する。開閉器9は
モータ停止時には再び閉路し、コンデンサー11の蓄積電
荷はダイオード13を通じて速やかに放電させ、ソフトス
タート回路8は直ちに次の起動が可能な状態となる。
Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention. The components having the same functions as those of the conventional motor control device shown in FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted. 8 shows the whole soft start circuit, 9 is a switch interlocked with the motor start signal, 10 is a reference power source, 11 is a capacitor, 12 is a resistor,
13 is a diode. The switch 9 is closed when the motor is stopped. When the switch 9 is opened in conjunction with the motor start signal, the capacitor 11 is charged by the reference power source 10 and its voltage is resistance.
The resistance value of 12 and the capacity of the capacitor 11 gradually increase according to a time constant formula. The reference operating point voltage of the operational amplifier 41 in the preamplifier circuit 4 is determined by the voltage of the positive input terminal, and since the positive input terminal is read close to the capacitor 11, the reference operating point voltage also gradually increases, resulting in rotation. The number control voltage gradually increases. For this reason, the pulse width control circuit 2 starts punching out the output sawtooth wave of the sawtooth wave generation circuit 1 from a low threshold level, raises the threshold level as the rotational speed control voltage gradually increases, and gradually expands the pulse width. Then, the output voltage of the drive circuit 3 starts from a low potential, and the voltage gradually increases in proportion to the expansion of the pulse width, so that an excessive rush current is prevented. The switch 9 is closed again when the motor is stopped, the accumulated charge in the capacitor 11 is quickly discharged through the diode 13, and the soft start circuit 8 is immediately ready for the next start.

なお本実施例では演算増幅器41の正入力端子を基準動
作点電圧の可変手段として用いているため、回転数制御
電圧を反転電圧として負入力端子に加え、フィードバッ
ク入力と加算演算して差動増幅効果を得ている。(反転
回路は図示せず。) 発明の効果 以上の実施例から明らかなように本発明によれば次の
効果が得られる。
In this embodiment, since the positive input terminal of the operational amplifier 41 is used as the variable means of the reference operating point voltage, the rotation speed control voltage is added as the inversion voltage to the negative input terminal, and the feedback input is added to the differential input to perform differential amplification It has an effect. (The inverting circuit is not shown.) Effects of the Invention As is apparent from the above embodiments, according to the present invention, the following effects can be obtained.

(1)モータが低電圧から起動されるため、滑らか始動
特性が得られる。
(1) Since the motor is started from a low voltage, smooth starting characteristics can be obtained.

(2)モータの起動時の突入電流を低くおさえることが
可能で、回路の電流定格が小さくできて安価となり、過
大な電流を起因する故障が少なくなり信頼性が向上す
る。
(2) The inrush current at the time of starting the motor can be suppressed to a low level, the current rating of the circuit can be reduced, the cost can be reduced, and failures due to an excessive current can be reduced to improve reliability.

(3)回転数制御を直流で行うため、フィードバックル
ープが回路構成が簡単な差動増幅回路で構成でき、ソフ
トスタート回路も抵抗、コンデンサ等の簡単な構成にな
り、技術的に容易で安価に回路が実現できる。
(3) Since the rotation speed control is performed by direct current, the feedback loop can be configured by a differential amplifier circuit with a simple circuit configuration, and the soft start circuit also has a simple configuration such as resistors and capacitors, which is technically easy and inexpensive. A circuit can be realized.

(4)基準電位が定常値に達した後は、何らの切り換え
手段を必要とせずに通常のフィードバック制御に移行す
る。
(4) After the reference potential reaches the steady value, the normal feedback control is performed without any switching means.

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

第1図は本発明の一実施例を示すモータ制御装置の構成
図、第2図は従来例のモータ制御装置の構成図である。 1……鋸歯状波発生回路、2……パルス幅制御回路、3
……駆動回路、4……前置増幅回路、8……ソフトスタ
ート回路。
FIG. 1 is a block diagram of a motor controller showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional motor controller. 1 ... Sawtooth wave generation circuit, 2 ... Pulse width control circuit, 3
...... Drive circuit, 4 …… Preamplifier circuit, 8 …… Soft start circuit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】入力パルス信号のパルス幅に比例して出力
電圧を変化させ、モータの回転数を制御する駆動回路
と、制御パルス信号の信号源となる鋸歯状波発生回路
と、前記鋸歯状波発生回路の出力鋸歯状波と回転数補正
電圧とを比較し、鋸歯状波を回転数補正電圧に比例した
パルス幅をもつパルス信号に変換し、前記駆動回路の入
力として供給するパルス幅制御回路と、モータの回転数
に比例した直流電圧を発生する回転数検知装置と、前記
回転数検知装置の直流電圧と回転数制御電圧の差分を増
幅して前記回転数補正電圧とし、フィードバック制御を
行う前置増幅回路と、前記前置増幅回路の基準動作電圧
をモータ起動信号に連動してCR回路によって漸増し、前
記前置増幅回路から供給する出力信号を低電圧から漸増
し、CR時定数後に前記回転数制御電圧に相当した回転数
補正電圧に制御するソフトスタート回路を備えた回転数
直流帰還型のモータ制御装置。
1. A drive circuit for changing the output voltage in proportion to the pulse width of an input pulse signal to control the number of revolutions of a motor, a sawtooth wave generating circuit as a signal source of a control pulse signal, and the sawtooth waveform. A pulse width control that compares the output sawtooth wave of the wave generation circuit with the rotation speed correction voltage, converts the sawtooth wave into a pulse signal having a pulse width proportional to the rotation speed correction voltage, and supplies it as an input to the drive circuit. A circuit, a rotation speed detection device that generates a DC voltage proportional to the rotation speed of the motor, and a feedback control that amplifies the difference between the DC voltage of the rotation speed detection device and the rotation speed control voltage to obtain the rotation speed correction voltage. The preamplifier circuit to perform, and the reference operating voltage of the preamplifier circuit is gradually increased by the CR circuit in conjunction with the motor start signal, the output signal supplied from the preamplifier circuit is gradually increased from a low voltage, and the CR time constant is increased. Later the above times A rotation speed DC feedback type motor control device having a soft start circuit for controlling a rotation speed correction voltage corresponding to a rotation speed control voltage.
JP61273305A 1986-11-17 1986-11-17 Motor control device Expired - Fee Related JPH0813193B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61273305A JPH0813193B2 (en) 1986-11-17 1986-11-17 Motor control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61273305A JPH0813193B2 (en) 1986-11-17 1986-11-17 Motor control device

Publications (2)

Publication Number Publication Date
JPS63129874A JPS63129874A (en) 1988-06-02
JPH0813193B2 true JPH0813193B2 (en) 1996-02-07

Family

ID=17526013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61273305A Expired - Fee Related JPH0813193B2 (en) 1986-11-17 1986-11-17 Motor control device

Country Status (1)

Country Link
JP (1) JPH0813193B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0635572Y2 (en) * 1989-09-29 1994-09-14 アイホン株式会社 Horizontal deflection circuit for video call equipment
JPH0493496U (en) * 1990-12-27 1992-08-13
DE4304960C3 (en) * 1993-02-18 2000-06-15 Bosch Gmbh Robert Motor speed control method
EP1039623A3 (en) * 1999-03-26 2003-09-03 Siemens Aktiengesellschaft Actuator and auxilliar drive in a vehicule with DC-motor and limiting of inrush current

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53126114A (en) * 1977-04-08 1978-11-04 Okuma Machinery Works Ltd Pulseewidth modulation servooamplifier
JPH0632597B2 (en) * 1983-03-23 1994-04-27 株式会社日立製作所 Excitation control device for synchronous machine
JPS59185187A (en) * 1983-04-01 1984-10-20 Fuji Xerox Co Ltd Speed controller of copying machine
JPS60261378A (en) * 1984-06-05 1985-12-24 Nissan Motor Co Ltd Controller for ac motor

Also Published As

Publication number Publication date
JPS63129874A (en) 1988-06-02

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