JPH04322122A - Motor controller or business machine - Google Patents

Motor controller or business machine

Info

Publication number
JPH04322122A
JPH04322122A JP3090286A JP9028691A JPH04322122A JP H04322122 A JPH04322122 A JP H04322122A JP 3090286 A JP3090286 A JP 3090286A JP 9028691 A JP9028691 A JP 9028691A JP H04322122 A JPH04322122 A JP H04322122A
Authority
JP
Japan
Prior art keywords
current
detection
torque
detection level
overcurrent
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
JP3090286A
Other languages
Japanese (ja)
Inventor
Tomoyuki Saito
斉藤 友之
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP3090286A priority Critical patent/JPH04322122A/en
Publication of JPH04322122A publication Critical patent/JPH04322122A/en
Pending legal-status Critical Current

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  • Handling Of Sheets (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Generators And Motors (AREA)
  • Stopping Of Electric Motors (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

PURPOSE:To protect a device against breakdown by detecting a current to be fed from a power supply through a driver to a motor, comparing the detected current with preset current detection level and overcurrent detection level, and lowering the current detection level and the overcurrent detection level upon detection of overcurrent. CONSTITUTION:Current is fed from a power supply 1 through a driver 2 to the coil 3 of the rotor 4 of a motor. Driving current detected through a current detector 5 is fed to a current limiter 6 and an overcurrent detector 8. The current limiter 6 compares the level of the driving current with a level set by a current detection level setter 7 and when the set level is exceeded, a signal is outputted to limit the current of the driver 2. The overcurrent detector 8 compares the level of the driving current with a level previously set by an overcurrent detection level setter 9 and when the set level is exceeded, a signal is outputted to lower the current detection level and the overcurrent detection level. Consequently, the driver and the coil are protected against breakdown. It is suitable for a business machine.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、電動機の制御装置ある
いは、この制御装置を具備する事務機器に関し、特に、
過電流および過負荷などによる異常状態においても駆動
手段の破壊を防止し、火災が発生せず、信頼性の高い電
動機の制御装置あるいはこれを使用した事務機器に関す
るものである。
[Field of Industrial Application] The present invention relates to a control device for an electric motor or office equipment equipped with this control device, and in particular, to
The present invention relates to a highly reliable electric motor control device or office equipment using the same, which prevents destruction of the drive means even in abnormal conditions such as overcurrent and overload, and prevents fire from occurring.

【0002】0002

【従来の技術】従来、電動機の制御装置において、大電
流によるモータやパワートランジスタ等のスイッチング
素子の焼損防止を図ることが一般に行われている。
2. Description of the Related Art Conventionally, in motor control devices, it has been common practice to prevent burning of switching elements such as motors and power transistors due to large currents.

【0003】特開昭62−281717号公報記載の保
護装置もこの技術に関するものである。
[0003] The protection device described in Japanese Patent Application Laid-Open No. 62-281717 also relates to this technique.

【0004】この公報には、負荷に流れる電流を検出す
る手段とコンパレータを有し、特に、間歇的な過電流状
態が継続した場合でも負荷が加熱状態になるのを防止で
きる電子式電流保護装置に関して記載してある。
This publication describes an electronic current protection device that has means for detecting the current flowing through the load and a comparator, and is capable of preventing the load from becoming overheated even if intermittent overcurrent conditions continue. It is written about.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記従
来技術は、直流電動機の回転子の拘束もしくはそれに近
い過負荷状態におけるスイッチング素子の保護について
は配慮されていない。又、回転子の拘束等の過負荷状態
においてスイッチング素子の破壊防止のためには、拘束
時に印加される電圧および電流に対して、スイッチング
素子の電圧定格および電流定格を相当に大きく設定する
ことが必要であり、制御装置の小型化に支障を来してい
る。
However, the above-mentioned prior art does not take into consideration the protection of the switching element in the case where the rotor of the DC motor is restricted or in a similar overload state. In addition, in order to prevent destruction of the switching element in overload conditions such as when the rotor is locked, it is necessary to set the voltage and current ratings of the switching element considerably higher than the voltage and current applied when the rotor is locked. This is necessary and poses an obstacle to miniaturization of the control device.

【0006】本発明の目的は、回転子の拘束もしくはそ
れに近い過負荷状態においても、前記のような不都合を
回避して、駆動装置が破壊せず、信頼性の高い電動機の
制御装置あるいはこれを使用した事務機器等を提供する
ことにある。
An object of the present invention is to provide a highly reliable electric motor control device or the like, which avoids the above-mentioned disadvantages and prevents the drive device from being destroyed even when the rotor is locked or is overloaded. The aim is to provide used office equipment, etc.

【0007】[0007]

【課題を解決するための手段】上記目的は、電源に接続
され、電動機に駆動電流を付与する駆動装置と、この駆
動装置に流れる電流を検出する電流検出装置と、この電
流検出装置の検出値と予め設定された電流検出レベルと
比較して駆動装置に流れる電流値を制限する電流制限装
置と、前記電流検出装置により前記駆動装置に流れる電
流の大きさを検出し、この検出値と予め設定された過電
流検出レベルとを比較して検出信号を発生する過電流検
出装置と、この過電流検出装置から出力される検出信号
によって前記電流制限装置の電流検出レベルを切換える
電流検出レベル設定装置と、前記過電流検出装置の検出
信号によって、過電流検出装置の過電流検出レベルを低
い値に切換え設定する過電流検出レベル設定装置を具備
すること、及びこれと同様にして電動機の過トルクを検
出するようにして達成することができる。
[Means for Solving the Problems] The above object is to provide a drive device that is connected to a power source and applies a drive current to a motor, a current detection device that detects the current flowing through the drive device, and a detected value of the current detection device. and a current limiting device that limits the current value flowing through the drive device by comparing it with a preset current detection level; an overcurrent detection device that generates a detection signal by comparing the detected overcurrent detection level with the overcurrent detection level; and a current detection level setting device that switches the current detection level of the current limiting device based on the detection signal output from the overcurrent detection device. , comprising an overcurrent detection level setting device that switches and sets the overcurrent detection level of the overcurrent detection device to a low value according to the detection signal of the overcurrent detection device, and detects overtorque of the electric motor in the same manner. It can be achieved in this way.

【0008】[0008]

【作用】一定レベル以上の過電流が例えば直流電動機あ
るいは駆動装置に流れると、電流検出装置の出力を受け
た過電流検出装置が過電流検出信号を出力し、過電流検
出信号を受けた電流検出レベル設定装置が電流制限装置
に与える電流検出レベルを引下げることにより、直流電
動機および駆動装置に流れる電流の値を引下げる。これ
により、駆動装置の破壊は防止される。また過電流検出
信号を受けた過電流検出レベル設定装置が過電流検出装
置に与える過電流検出レベルを引下げる。これにより、
電流値が下がっても過電流検出信号は継続して出力され
るため、電流検出レベルと過電流検出レベルは引下げら
れたレベルのまま継続し、過負荷状態が解除されるまで
直流電動機および駆動装置に流れる電流の引下げ状態は
継続される。
[Operation] When an overcurrent of a certain level or more flows to a DC motor or drive device, for example, the overcurrent detection device receives the output of the current detection device and outputs an overcurrent detection signal, and the current detection device receives the overcurrent detection signal. By lowering the current detection level provided by the level setting device to the current limiting device, the value of the current flowing through the DC motor and the drive device is lowered. This prevents the drive device from being destroyed. Further, the overcurrent detection level setting device that receives the overcurrent detection signal lowers the overcurrent detection level given to the overcurrent detection device. This results in
Even if the current value decreases, the overcurrent detection signal continues to be output, so the current detection level and overcurrent detection level continue to remain at the lowered levels, and the DC motor and drive device continue to be output until the overload condition is released. The state in which the current flows continues to be lowered.

【0009】[0009]

【実施例】図1は本発明構成の一実施例を示すものでブ
ラシレス電動機の制御ブロック図である。図1において
、1は直流電源、2はパワートランジスタ等のスイッチ
ング素子を含む駆動装置で、この駆動装置2は直流電源
1から加えられる直流電圧を交流電圧に変換して電動機
のコイル3に付与する。電動機は、三相のコイル3と、
コイル3が発生する磁界に応じて回転する回転子4とか
ら構成される。電流検出装置5は、電動機のコイル3か
ら駆動装置を経由して直流電源1に戻る電流を検出して
、電流の大きさを電圧値に置き換えて、電流制限装置6
と過電流検出装置8とに出力する。電流制限装置6は、
電流検出装置5の出力が電流検出レベル設定装置7の出
力レベルに達すると、駆動電流を遮断する指令信号を駆
動装置2に出力する。過電流検出装置8は、電流検出装
置5の出力レベルが過電流検出レベル設定装置9の設定
レベルに達すると、過電流検出信号を、電流検出レベル
設定装置7と過電流検出レベル設定装置9とに出力する
。電流検出レベル設定装置7は、過電流検出装置8の出
力信号を受けて、それに応じた電流検出レベルを電流制
限装置6に出力する。過電流検出レベル設定装置9は、
過電流検出装置8の出力信号を受けて、それに応じた過
電流検出レベルを過電流検出装置8に出力する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a control block diagram of a brushless motor showing an embodiment of the present invention. In FIG. 1, 1 is a DC power supply, 2 is a drive device including switching elements such as power transistors, and this drive device 2 converts the DC voltage applied from the DC power supply 1 into AC voltage and applies it to the coil 3 of the motor. . The electric motor has a three-phase coil 3,
It is composed of a rotor 4 that rotates according to the magnetic field generated by a coil 3. The current detection device 5 detects the current that returns from the coil 3 of the motor to the DC power supply 1 via the drive device, replaces the magnitude of the current with a voltage value, and controls the current limiting device 6.
and the overcurrent detection device 8. The current limiting device 6 is
When the output of the current detection device 5 reaches the output level of the current detection level setting device 7, a command signal to cut off the drive current is output to the drive device 2. When the output level of the current detection device 5 reaches the set level of the overcurrent detection level setting device 9, the overcurrent detection device 8 transmits the overcurrent detection signal to the current detection level setting device 7 and the overcurrent detection level setting device 9. Output to. Current detection level setting device 7 receives the output signal of overcurrent detection device 8 and outputs a current detection level corresponding thereto to current limiting device 6. The overcurrent detection level setting device 9 is
Upon receiving the output signal of the overcurrent detection device 8, an overcurrent detection level corresponding to the output signal is outputted to the overcurrent detection device 8.

【0010】次に、前記制御ブロック図における電流制
限装置6の具体的構成を図2に基づいて説明する。。図
2において、10は積分器で、この積分器10は電流検
出装置5の出力を受けて、比較器11に出力する。比較
器11は、積分器10の出力と基準電圧13とを比較し
て、その結果をワンショット回路12に出力する。ワン
ショット回路12は、比較器11の出力と基準電圧14
とから、駆動電流を遮断する指令信号を駆動装置に出力
する。
Next, the specific configuration of the current limiting device 6 in the control block diagram will be explained based on FIG. 2. . In FIG. 2, reference numeral 10 denotes an integrator, and this integrator 10 receives the output of the current detection device 5 and outputs it to the comparator 11. Comparator 11 compares the output of integrator 10 and reference voltage 13 and outputs the result to one-shot circuit 12 . The one-shot circuit 12 connects the output of the comparator 11 and the reference voltage 14.
Then, a command signal to cut off the drive current is output to the drive device.

【0011】図3に電流制限装置6の具体的な回路図を
示す。さらに図4に図3の電流制限装置6の各構成要素
に対応するV1ないしV7の波形図を示す。駆動電流は
抵抗R1により電圧V1に変換され、さらに抵抗R2と
キャパシタC1とで構成される積分器に加えられ、その
出力V2は、図4のV2に示すように平滑された波形と
なる。電圧V2が、制御用電源電圧VCCと抵抗R3,
R4で設定される電圧V3に達すると、コンパレータ1
5の出力V4は反転し、その結果、抵抗R5,R6,キ
ャパシタC2で構成された積分器を通した後の電圧V5
は図4の波形V5のようになる。この電圧V5は更にコ
ンパレータ16に加えられる。コンパレータ16は、電
圧V5と、制御電源電圧VCCと抵抗R7,R8とで設
定される電圧V6とを比較し、出力は図4の波形V7よ
うな波形となる。図4の場合、V7のハイレベルが駆動
電流の遮断指令である。
FIG. 3 shows a specific circuit diagram of the current limiting device 6. Further, FIG. 4 shows a waveform diagram of V1 to V7 corresponding to each component of the current limiting device 6 of FIG. 3. The drive current is converted into a voltage V1 by a resistor R1, which is further applied to an integrator composed of a resistor R2 and a capacitor C1, and its output V2 has a smoothed waveform as shown in V2 of FIG. Voltage V2 is connected to control power supply voltage VCC and resistor R3,
When the voltage V3 set by R4 is reached, comparator 1
5's output V4 is inverted, resulting in a voltage V5 after passing through an integrator consisting of resistors R5, R6 and capacitor C2.
becomes like the waveform V5 in FIG. This voltage V5 is further applied to a comparator 16. The comparator 16 compares the voltage V5 with the voltage V6 set by the control power supply voltage VCC and the resistors R7 and R8, and outputs a waveform like the waveform V7 in FIG. 4. In the case of FIG. 4, the high level of V7 is the drive current cutoff command.

【0012】図5に、過電流検出装置8のブロック図を
示す。図5において、17は積分器で、この積分器17
は電流検出装置5の出力を受けて、比較器18に出力す
る。比較器18は、積分器17の出力と基準電圧21と
を比較して、その結果を積分器19に出力する。比較器
20は、積分器19の出力と基準電圧22を受けて、積
分器19の出力が基準電圧22に達すると、過電流検出
信号を出力する。
FIG. 5 shows a block diagram of the overcurrent detection device 8. In FIG. 5, 17 is an integrator, and this integrator 17
receives the output of the current detection device 5 and outputs it to the comparator 18. Comparator 18 compares the output of integrator 17 and reference voltage 21 and outputs the result to integrator 19 . Comparator 20 receives the output of integrator 19 and reference voltage 22, and outputs an overcurrent detection signal when the output of integrator 19 reaches reference voltage 22.

【0013】図6に過電流検出装置8の具体的な回路図
を示す。図7に図8の過電流検出装置の各構成要素に対
応するV8ないしV13の波形図を示す。駆動電流は、
抵抗R1により電圧V8に変換されて、抵抗R9とキャ
パシタC3とで構成される積分器に加えられ、その出力
V9は、図7に示すように平滑された波形となる。電圧
V8が過負荷等によって上昇すると、それに応じて平滑
された電圧V9もまた上昇し、電圧V9が、制御用電源
電圧VCCと抵抗R10、R11で設定される電圧V1
0に達するか又は超えると、コンパレータ23の出力V
11は、図7に示すように上昇を開始する。この電圧V
11は、制御電源電圧VCCと抵抗R7,R8とで設定
される電圧V12と共にコンパレータ24に加わり、コ
ンパレータ24は、電圧V11が電圧V12の値に達す
ると図7のように出力が反転する。図7の場合、V13
のハイレベルが過電流検出信号である。
FIG. 6 shows a specific circuit diagram of the overcurrent detection device 8. FIG. 7 shows a waveform diagram of V8 to V13 corresponding to each component of the overcurrent detection device of FIG. 8. The driving current is
It is converted into a voltage V8 by a resistor R1 and applied to an integrator composed of a resistor R9 and a capacitor C3, and its output V9 has a smoothed waveform as shown in FIG. When voltage V8 increases due to overload, etc., the smoothed voltage V9 also increases accordingly, and voltage V9 becomes equal to voltage V1 set by control power supply voltage VCC and resistors R10 and R11.
When reaching or exceeding 0, the output of comparator 23 V
11 starts to rise as shown in FIG. This voltage V
11 is applied to the comparator 24 together with the voltage V12 set by the control power supply voltage VCC and resistors R7 and R8, and when the voltage V11 reaches the value of the voltage V12, the output of the comparator 24 is inverted as shown in FIG. In the case of Figure 7, V13
The high level of is the overcurrent detection signal.

【0014】図8は前記電流制限装置6や過電流検出装
置8等を含む本発明の全体的な一実施例を示す回路図で
ある。過電流検出装置8の出力となるコンパレータ24
の出力端子は、抵抗R20を介して制御電源VCCに接
続され、また、コンパレータ24の出力端子は、抵抗R
16を介して、エミッタ端子を接地したトランジスタ4
5のベース端子に接続し、トランジスタ45のコレクタ
端子は、R17を介して抵抗R4に接続される。また、
抵抗R4には、並列にキャパシタC5が接続される。同
様の構成で、コンパレータ24の出力端子は、抵抗R1
8を介して、エミッタ端子を接地したトランジスタ46
のベース端子に接続し、トランジスタ45のコレクタ端
子は、R19を介して抵抗R11に接続される。また、
抵抗R11には並列にキャパシタC6が接続される。
FIG. 8 is a circuit diagram showing an overall embodiment of the present invention including the current limiting device 6, overcurrent detecting device 8, etc. Comparator 24 that serves as the output of overcurrent detection device 8
The output terminal of the comparator 24 is connected to the control power supply VCC via a resistor R20, and the output terminal of the comparator 24 is connected to a resistor R20.
Transistor 4 whose emitter terminal is grounded via 16
The collector terminal of the transistor 45 is connected to the resistor R4 via R17. Also,
A capacitor C5 is connected in parallel to the resistor R4. In a similar configuration, the output terminal of the comparator 24 is connected to the resistor R1.
8, a transistor 46 whose emitter terminal is grounded
The collector terminal of the transistor 45 is connected to the resistor R11 via R19. Also,
A capacitor C6 is connected in parallel to the resistor R11.

【0015】図9には前記図8の構成を参照した本発明
の動作例を示している。電動機4に、時刻T1から過負
荷が加わると、駆動電流が増大し、電流検出装置5の抵
抗R1の出力である電圧V14も図9に示すように増大
する。また、電圧V14を、抵抗R2とキャパシタC1
とで構成した積分器に加えて出力される平滑された電圧
V15も増大する。この時、電圧V15は、制御用電源
電圧VCCと抵抗R10と抵抗R11とで分圧設定され
ている電圧V19よりも高いため、コンパレータ23の
出力電圧V16は、図9のように上昇する。電圧V16
が制御電源電圧VCCと抵抗R14,R15とで分圧設
定される電圧V12に時刻T2で達すると、コンパレー
タ24の出力電圧V17は図9のようにハイレベルとロ
ーレベルとを交互に繰返す断続状態となる。その結果、
トランジスタ45のコレクタとエミッタ間も断続状態と
なり、電圧V18のレベルは、図9のように引下げられ
る。この時、キャパシタC5があるため電圧V18は、
リプルをもつものの、断続はしない。この電流検出レベ
ルであるV18が引下げられることにより、駆動電流は
、時刻T2以前と比較して低いレベルに制限される。 同様に、トランジスタ46のコレクタとエミッタ間も断
続状態となり、電圧V19のレベルは、図9のように引
下げられる。この時、キャパシタC6があるため電圧V
19は、リプルをもつものの、断続はしない。この過電
流検出レベルである電圧V19が引下げられることによ
り、駆動電流が小さく制限されても、過電流検出信号は
出力し続けるため、この駆動電流を小さく制限する状態
は、継続する。
FIG. 9 shows an example of the operation of the present invention with reference to the configuration shown in FIG. When an overload is applied to the motor 4 from time T1, the drive current increases, and the voltage V14, which is the output of the resistor R1 of the current detection device 5, also increases as shown in FIG. Also, voltage V14 is connected to resistor R2 and capacitor C1.
The smoothed voltage V15 outputted in addition to the integrator configured with is also increased. At this time, since the voltage V15 is higher than the voltage V19 divided by the control power supply voltage VCC and the resistors R10 and R11, the output voltage V16 of the comparator 23 increases as shown in FIG. Voltage V16
When reaches the voltage V12, which is divided by the control power supply voltage VCC and resistors R14 and R15, at time T2, the output voltage V17 of the comparator 24 enters an intermittent state in which high level and low level are alternately repeated as shown in FIG. becomes. the result,
The collector and emitter of the transistor 45 are also in an intermittent state, and the level of the voltage V18 is lowered as shown in FIG. At this time, since there is a capacitor C5, the voltage V18 is
Although it has ripples, it is not intermittent. By lowering this current detection level V18, the drive current is limited to a lower level than before time T2. Similarly, the collector and emitter of the transistor 46 are also in an intermittent state, and the level of the voltage V19 is lowered as shown in FIG. At this time, since there is a capacitor C6, the voltage V
No. 19 has ripples but is not intermittent. Even if the drive current is limited to a small value by lowering the voltage V19, which is the overcurrent detection level, the overcurrent detection signal continues to be output, so the state in which the drive current is limited to a small value continues.

【0016】図10に直流ブラシ付き電動機に適用した
場合の一実施例を示す。図において、直流ブラシ付き電
動機25は、直流電源1と駆動装置27とに接続され、
また駆動装置27は、電流検出装置5に接続される。ま
た、ダイオード26が直流ブラシ付き電動機25に並列
に接続される。その他の構成は、図1と同じである。ま
た、装置全体の動作も図1と同じである。
FIG. 10 shows an embodiment in which the present invention is applied to a DC brush motor. In the figure, a DC brushed electric motor 25 is connected to a DC power supply 1 and a drive device 27,
Further, the drive device 27 is connected to the current detection device 5. Further, a diode 26 is connected in parallel to the DC brush motor 25. The other configurations are the same as in FIG. 1. Further, the operation of the entire device is also the same as in FIG.

【0017】図11に直流ブラシ付き電動機に適用した
場合の他の実施例を示す。図11において、駆動装置2
9は直流電源1と直流ブラシ付き電動機25とに接続さ
れ、また直流ブラシ付き電動機29は、電流検出装置5
に接続される。また、ダイオード28のカソードが直流
ブラシ付き電動機29に接続され、ダイオード28のア
ノードが接地される。その他の構成は図1と同じである
。また、装置全体の動作も図1と同様である。
FIG. 11 shows another embodiment in which the present invention is applied to a DC brush motor. In FIG. 11, the drive device 2
9 is connected to the DC power supply 1 and the DC brushed motor 25, and the DC brushed motor 29 is connected to the current detection device 5.
connected to. Further, the cathode of the diode 28 is connected to the DC brush motor 29, and the anode of the diode 28 is grounded. The other configurations are the same as in FIG. Further, the operation of the entire device is also similar to that in FIG.

【0018】図12に過負荷を検出するためのものとし
て負荷トルク検出装置を使用した場合の一実施例を示す
。負荷トルク検出装置30の出力はトルク制限装置31
に接続され、トルク制限装置31は、設定されたトルク
検出レベルと前記負荷トルク検出装置30の出力とを比
較し、その結果に応じた指令信号を駆動装置2に出力す
る。また、過電流検出装置8の出力は、トルク検出レベ
ル設定装置32に接続され、トルク検出レベル設定装置
32の出力は、トルク制限装置31に接続される。その
他の構成は図1と同様である。また、装置全体の動作も
図1と同様である。
FIG. 12 shows an embodiment in which a load torque detection device is used to detect overload. The output of the load torque detection device 30 is transmitted to the torque limiting device 31.
The torque limiting device 31 compares the set torque detection level with the output of the load torque detecting device 30, and outputs a command signal to the drive device 2 according to the result. Further, the output of the overcurrent detection device 8 is connected to a torque detection level setting device 32 , and the output of the torque detection level setting device 32 is connected to a torque limiting device 31 . The other configurations are the same as in FIG. 1. Further, the operation of the entire device is also similar to that in FIG.

【0019】図13に前記発明を適用した電動機をプリ
ンタ,ファクシミリもしくは複写機等事務機器の給紙用
電動機に適用した構成図を示す。システムコントローラ
33は、レーザ発光源34を制御し、レーザ発光源34
は、レーザ光を多角形ミラー35に照射して感光体ドラ
ム41を感光させる。感光体ドラム41にレーザ光によ
ってイメージされた印刷パターンは転写ドラム42に転
写され、現像剤36が付着する。トレイ38上の紙37
は、給紙用電動機39による動力で、事務機器の複写あ
るいは印字部に送られる。送られた前記の紙37は、転
写ドラム42に付着した現像剤36を付着後、送紙ベル
ト43により送られて、定着機44により現像剤36を
定着した後、プリンタもしくはファクシミリもしくは複
写機の外部に送り出される。
FIG. 13 shows a configuration diagram in which the electric motor to which the above invention is applied is applied to a paper feeding electric motor for office equipment such as a printer, facsimile, or copying machine. The system controller 33 controls the laser light source 34 and
The polygonal mirror 35 is irradiated with a laser beam to expose the photosensitive drum 41 to light. The print pattern imaged on the photosensitive drum 41 by laser light is transferred to the transfer drum 42, and the developer 36 is attached thereto. paper 37 on tray 38
is sent to the copying or printing section of the office equipment using power from the paper feed motor 39. The fed paper 37 has the developer 36 attached to the transfer drum 42, is sent by the paper feed belt 43, and after the developer 36 is fixed by the fixing device 44, it is sent to a printer, facsimile, or copying machine. sent outside.

【0020】プリンタ,ファクシミリもしくは複写機等
の事務機器においては、使用中、よく紙詰まり現象を経
験するものである。紙詰まり状態で長時間運転すると、
紙送りローラと紙の摩擦や、モータがロック状態となっ
て火災を発生したり、又、多くの用紙を破損してしまう
という問題点を持っている。従って、紙詰まりが発生し
たら直ちに運転を停止することが望まれる。
[0020] Office equipment such as printers, facsimile machines, and copying machines often experience paper jams during use. If you operate for a long time with a paper jam,
This method has problems such as friction between the paper feed roller and the paper, a locking of the motor, which can cause fires, and damage to many sheets of paper. Therefore, it is desirable to stop operation immediately when a paper jam occurs.

【0021】紙詰まりが発生すると、紙送りローラの負
荷が大幅に増すか、あるいはロック状態に陥る。紙送り
ローラがロックするとこのローラを駆動するモータもロ
ック状態になり、電流が増大する。この件に関してみれ
ば、前記本発明は過電流が所定時間継続すると通電を遮
断するので安全であり、火災の恐れを有しない。特に本
発明は過電流検出のための基準電圧を低くするようにし
たので安全性が更に向上する。
[0021] When a paper jam occurs, the load on the paper feed roller increases significantly or it becomes locked. When the paper feed roller is locked, the motor that drives this roller is also locked, and the current increases. Regarding this matter, the present invention is safe because the current is cut off if the overcurrent continues for a predetermined period of time, and there is no risk of fire. In particular, since the present invention lowers the reference voltage for overcurrent detection, safety is further improved.

【0022】[0022]

【発明の効果】以上説明したように、本発明によれば、
電動機の制御装置を、電源に接続され、電動機に駆動電
流を付与する駆動装置と、この駆動装置に流れる電流を
検出する電流検出装置と、この電流検出装置の検出値と
予め設定された電流検出レベルと比較して駆動装置に流
れる電流値を制限する電流制限装置と、前記電流検出装
置により前記駆動装置に流れる電流の大きさを検出し、
この検出値と予め設定された過電流検出レベルとを比較
して検出信号を発生する過電流検出装置と、この過電流
検出装置から出力される検出信号によって前記電流制限
装置の電流検出レベルを切換える電流検出レベル設定装
置と、前記過電流検出装置の検出信号によって、過電流
検出装置の過電流検出レベルを低い値に切換え設定する
過電流検出レベル設定装置を具備させるように構成した
ので、電動機の回転子の拘束等の過負荷状態においても
、駆動装置の破壊のない、信頼性の高い制御装置を提供
することが可能になる。また、小形で安価な駆動素子を
適用することが可能になり、これを複写あるいは印字装
置を有する事務機器の送紙電動機の制御装置に使用すれ
ば紙づまりによって発生する火災の発生を未然に防止す
ることができる。
[Effects of the Invention] As explained above, according to the present invention,
The motor control device includes a drive device that is connected to a power source and applies a drive current to the motor, a current detection device that detects the current flowing through the drive device, and a detected value of this current detection device and a preset current detection. a current limiting device that limits a current value flowing through the driving device in comparison with a level; and a current detecting device that detects the magnitude of the current flowing through the driving device;
an overcurrent detection device that generates a detection signal by comparing this detection value with a preset overcurrent detection level; and a current detection level of the current limiting device is switched based on the detection signal output from the overcurrent detection device. Since the configuration is equipped with a current detection level setting device and an overcurrent detection level setting device that switches and sets the overcurrent detection level of the overcurrent detection device to a low value based on the detection signal of the overcurrent detection device, the motor It is possible to provide a highly reliable control device in which the drive device is not destroyed even in an overload state such as when the rotor is locked. In addition, it has become possible to apply a small and inexpensive drive element, and if this is used in a control device for the paper feed motor of office equipment that has a copying or printing device, it can prevent fires caused by paper jams. can do.

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

【図1】本発明構成の一実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the configuration of the present invention.

【図2】電流制限装置の機能ブロック図。FIG. 2 is a functional block diagram of a current limiting device.

【図3】電流制限装置の一実施例回路図。FIG. 3 is a circuit diagram of an embodiment of a current limiting device.

【図4】電流制限装置の動作を示すタイムチャート。FIG. 4 is a time chart showing the operation of the current limiting device.

【図5】過電流検出装置の機能ブロック図。FIG. 5 is a functional block diagram of an overcurrent detection device.

【図6】過電流検出装置の一実施例回路図。FIG. 6 is a circuit diagram of an embodiment of an overcurrent detection device.

【図7】過電流検出装置の動作を示すタイムチャート。FIG. 7 is a time chart showing the operation of the overcurrent detection device.

【図8】本発明の一実施例を示す回路図。FIG. 8 is a circuit diagram showing an embodiment of the present invention.

【図9】本発明の動作を示すタイムチャート。FIG. 9 is a time chart showing the operation of the present invention.

【図10】本発明の他の実施例を示すブロック図。FIG. 10 is a block diagram showing another embodiment of the present invention.

【図11】本発明の他の実施例を示すブロック図。FIG. 11 is a block diagram showing another embodiment of the present invention.

【図12】同じく本発明の他の実施例を示すブロック図
FIG. 12 is a block diagram showing another embodiment of the present invention.

【図13】本発明電動機を具備するプリンタもしくはフ
ァクシミリもしくは複写機等の構成図。
FIG. 13 is a configuration diagram of a printer, facsimile, copying machine, etc. equipped with the electric motor of the present invention.

【符号の説明】[Explanation of symbols]

1…直流電源、2…駆動装置、3…電動機のコイル、4
…電動機の回転子、5…電流検出装置、6…電流制限装
置、7…電流検出レベル設定装置、8…過電流検出装置
、9…過電流検出レベル設定装置、10…積分器、11
…比較器、12…ワンショット回路、13…基準電圧、
14…基準電圧、15…コンパレータ、16…コンパレ
ータ、17…積分器、18…比較器、19…積分器、2
0…比較器、21…基準電圧、22…基準電圧、23…
コンパレータ、24…コンパレータ、25…直流ブラシ
付き電動機、26…ダイオード、27…駆動装置、28
…ダイオード、29…ダイオード、30…負荷トルク検
出装置、31…トルク制限装置、32…トルク検出レベ
ル設定装置、33…システムコントローラ、34…レー
ザ発光源、35…多角形ミラー、36…現像剤、37…
紙、38…トレイ、39…給紙用電動機、40…現像用
電動機、41…感光体ドラム、42…転写ドラム、43
…送紙ベルト、44…定着機、45…トランジスタ、4
6…トランジスタ、R1…抵抗、R2…抵抗、R3…抵
抗、R4…抵抗、R5…抵抗、R6…抵抗、R7…抵抗
、R8…抵抗、R9…抵抗、R10…抵抗、R11…抵
抗、R12…抵抗、R13…抵抗、R14…抵抗、R1
5…抵抗、R16…抵抗、R17…抵抗、R18…抵抗
、R19…抵抗、C1…キャパシタ、C2…キャパシタ
、C3…キャパシタ、C4…キャパシタ、C5…キャパ
シタ、C6…キャパシタ、VCC…制御用電源、V1…
電圧波形、V2…電圧波形、V3…電圧波形、V4…電
圧波形、V5…電圧波形、V6…電圧波形、V7…電圧
波形、V8…電圧波形、V9…電圧波形、V10…電圧
波形、V11…電圧波形、V12…電圧波形、V13…
電圧波形、V14…電圧波形、V15…電圧波形、V1
6…電圧波形、V17…電圧波形、V18…電圧波形、
V19…電圧波形、T1…時刻、T2…時刻。
1... DC power supply, 2... Drive device, 3... Motor coil, 4
... Motor rotor, 5... Current detection device, 6... Current limiting device, 7... Current detection level setting device, 8... Overcurrent detection device, 9... Overcurrent detection level setting device, 10... Integrator, 11
...Comparator, 12...One-shot circuit, 13...Reference voltage,
14... Reference voltage, 15... Comparator, 16... Comparator, 17... Integrator, 18... Comparator, 19... Integrator, 2
0... Comparator, 21... Reference voltage, 22... Reference voltage, 23...
Comparator, 24... Comparator, 25... DC brush motor, 26... Diode, 27... Drive device, 28
...Diode, 29...Diode, 30...Load torque detection device, 31...Torque limiting device, 32...Torque detection level setting device, 33...System controller, 34...Laser emission source, 35...Polygon mirror, 36...Developer, 37...
paper, 38...tray, 39...paper feeding motor, 40...developing motor, 41...photosensitive drum, 42...transfer drum, 43
...Paper transport belt, 44...Fuser, 45...Transistor, 4
6...Transistor, R1...Resistance, R2...Resistance, R3...Resistance, R4...Resistance, R5...Resistance, R6...Resistance, R7...Resistance, R8...Resistance, R9...Resistance, R10...Resistance, R11...Resistance, R12... Resistor, R13...Resistance, R14...Resistance, R1
5...Resistor, R16...Resistor, R17...Resistor, R18...Resistor, R19...Resistor, C1...Capacitor, C2...Capacitor, C3...Capacitor, C4...Capacitor, C5...Capacitor, C6...Capacitor, VCC...Control power supply, V1...
Voltage waveform, V2...voltage waveform, V3...voltage waveform, V4...voltage waveform, V5...voltage waveform, V6...voltage waveform, V7...voltage waveform, V8...voltage waveform, V9...voltage waveform, V10...voltage waveform, V11... Voltage waveform, V12... Voltage waveform, V13...
Voltage waveform, V14...voltage waveform, V15...voltage waveform, V1
6... Voltage waveform, V17... Voltage waveform, V18... Voltage waveform,
V19...voltage waveform, T1...time, T2...time.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】電源に接続され、電動機に駆動電流を付与
する駆動装置と、この駆動装置に流れる電流を検出する
電流検出装置と、この電流検出装置の検出値と予め設定
された電流検出レベルと比較して駆動装置に流れる電流
値を制限する電流制限装置と、前記電流検出装置により
前記駆動装置に流れる電流の大きさを検出し、この検出
値と予め設定された過電流検出レベルとを比較して検出
信号を発生する過電流検出装置と、この過電流検出装置
から出力される検出信号によって前記電流制限装置の電
流検出レベルを切換える電流検出レベル設定装置と、前
記過電流検出装置の検出信号によって、過電流検出装置
の過電流検出レベルを低い値に切換え設定する過電流検
出レベル設定装置を具備することを特徴とする電動機の
制御装置。
1. A drive device that is connected to a power source and applies a drive current to an electric motor, a current detection device that detects the current flowing through the drive device, and a detected value of the current detection device and a preset current detection level. a current limiting device that limits a current value flowing through the driving device in comparison with the current value, and a current detecting device that detects the magnitude of the current flowing through the driving device, and compares this detected value with a preset overcurrent detection level. an overcurrent detection device that compares and generates a detection signal; a current detection level setting device that switches the current detection level of the current limiting device based on the detection signal output from the overcurrent detection device; and a detection signal of the overcurrent detection device. A control device for an electric motor, comprising an overcurrent detection level setting device that switches and sets an overcurrent detection level of an overcurrent detection device to a low value in response to a signal.
【請求項2】電源に接続され、電動機に駆動電流を付与
する駆動装置と、この電動機トルクを検出するトルク検
出装置と、このトルク検出装置の検出値と予め設定され
たトルク検出レベルと比較して駆動装置に流れるトルク
を制限するトルク制限装置と、前記トルク検出装置によ
り前記電動機が発生するトルクの大きさを検出し、この
検出値と予め設定された過トルク検出レベルとを比較し
て検出信号を発生する過トルク検出装置と、この過トル
ク検出装置から出力される検出信号によって前記トルク
制限装置のトルク検出レベルを切換えるトルク検出レベ
ル設定装置と、前記過トルク検出装置の検出信号によっ
て、過トルク検出装置の過トルク検出レベルを低い値に
切換え設定する過トルク検出レベル設定装置を具備する
ことを特徴とする電動機の制御装置。
2. A drive device connected to a power source and applying a drive current to the electric motor; a torque detection device that detects the torque of the electric motor; and a torque detection device that compares the detection value of the torque detection device with a preset torque detection level. a torque limiting device that limits the torque flowing to the drive device; and a torque detecting device that detects the magnitude of the torque generated by the electric motor, and detects by comparing this detected value with a preset overtorque detection level. An overtorque detection device that generates a signal; a torque detection level setting device that switches the torque detection level of the torque limiting device based on the detection signal output from the overtorque detection device; A control device for an electric motor, comprising an overtorque detection level setting device that switches and sets an overtorque detection level of a torque detection device to a low value.
【請求項3】請求項1において、電流制限装置あるいは
過電流検出装置のいずれか一方あるいは両者に積分器を
設けた電動機の制御装置。
3. The motor control device according to claim 1, wherein an integrator is provided in either or both of the current limiting device and the overcurrent detecting device.
【請求項4】複写あるいは印字部と、この複写あるいは
印字部に用紙送りローラを駆動する送紙用電動機とを有
する事務機器において、前記電動機は、電源に接続され
た駆動装置に接続され、この電動機の制御装置は駆動装
置に流れる電流を検出する電流検出装置と、この電流検
出装置の検出値と予め設定された電流検出レベルと比較
して駆動装置に流れる電流値を制限する電流制限装置と
、前記電流検出装置により前記駆動装置に流れる電流の
大きさを検出し、この検出値と予め設定された過電流検
出レベルとを比較して検出信号を発生する過電流検出装
置と、この過電流検出装置から出力される検出信号によ
って前記電流制限装置の電流検出レベルを切換える電流
検出レベル設定装置と、前記過電流検出装置の検出信号
によって、過電流検出装置の過電流検出レベルを低い値
に切換え設定する過電流検出レベル設定装置を具備して
いることを特徴とする事務機器。
4. Office equipment having a copying or printing section and a paper feeding motor for driving a paper feeding roller in the copying or printing section, wherein the motor is connected to a drive device connected to a power supply, and the motor is connected to a drive device connected to a power source. The control device includes a current detection device that detects the current flowing through the drive device, a current limiting device that limits the current value flowing through the drive device by comparing the detection value of the current detection device with a preset current detection level, an overcurrent detection device that detects the magnitude of the current flowing through the drive device using the current detection device, and generates a detection signal by comparing the detected value with a preset overcurrent detection level; a current detection level setting device that switches the current detection level of the current limiting device based on a detection signal output from the device; and a current detection level setting device that switches the overcurrent detection level of the overcurrent detection device to a low value based on the detection signal of the overcurrent detection device. Office equipment characterized by being equipped with an overcurrent detection level setting device.
【請求項5】複写あるいは印字部と、この複写あるいは
印字部に用紙送りローラを駆動する送紙用電動機とを有
する事務機器において、前記電動機は、電源に接続され
た駆動装置に接続され、この電動機の制御装置は電動機
のトルクを検出するトルク検出装置と、このトルク検出
装置の検出値と予め設定されたトルク検出レベルと比較
して駆動装置に流れるトルクを制限するトルク制限装置
と、前記トルク検出装置により前記電動機が発生するト
ルクの大きさを検出し、この検出値と予め設定された過
トルク検出レベルとを比較して検出信号を発生する過ト
ルク検出装置と、この過トルク検出装置から出力される
検出信号によって前記トルク制限装置のトルク検出レベ
ルを切換えるトルク検出レベル設定装置と、前記過トル
ク検出装置の検出信号によって、過トルク検出装置の過
トルク検出レベルを低い値に切換え設定する過トルク検
出レベル設定装置を具備することを特徴とする事務機器
5. Office equipment having a copying or printing section and a paper feeding motor for driving a paper feeding roller in the copying or printing section, wherein the motor is connected to a drive device connected to a power supply, and the motor is connected to a drive device connected to a power source. The control device includes a torque detecting device that detects the torque of the electric motor, a torque limiting device that limits the torque flowing to the drive device by comparing the detected value of the torque detecting device with a preset torque detection level, and the torque detecting device that detects the torque of the electric motor. an overtorque detection device that detects the magnitude of torque generated by the electric motor and generates a detection signal by comparing the detected value with a preset overtorque detection level; and an output from the overtorque detection device. a torque detection level setting device that switches the torque detection level of the torque limiting device based on a detection signal generated by the overtorque detection device; Office equipment characterized by being equipped with a detection level setting device.
JP3090286A 1991-04-22 1991-04-22 Motor controller or business machine Pending JPH04322122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3090286A JPH04322122A (en) 1991-04-22 1991-04-22 Motor controller or business machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3090286A JPH04322122A (en) 1991-04-22 1991-04-22 Motor controller or business machine

Publications (1)

Publication Number Publication Date
JPH04322122A true JPH04322122A (en) 1992-11-12

Family

ID=13994284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3090286A Pending JPH04322122A (en) 1991-04-22 1991-04-22 Motor controller or business machine

Country Status (1)

Country Link
JP (1) JPH04322122A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003061375A (en) * 2001-08-10 2003-02-28 Sanwa Shutter Corp Voltage change detection structure of switch for building
JP2009240045A (en) * 2008-03-26 2009-10-15 Panasonic Electric Works Co Ltd Method of driving and controlling linear vibration motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003061375A (en) * 2001-08-10 2003-02-28 Sanwa Shutter Corp Voltage change detection structure of switch for building
JP2009240045A (en) * 2008-03-26 2009-10-15 Panasonic Electric Works Co Ltd Method of driving and controlling linear vibration motor
JP4557029B2 (en) * 2008-03-26 2010-10-06 パナソニック電工株式会社 Drive control method for linear vibration motor

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