JP2004260980A - Method for detecting abnormality in constant voltage stepping motor drive circuit - Google Patents

Method for detecting abnormality in constant voltage stepping motor drive circuit Download PDF

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JP2004260980A
JP2004260980A JP2003052149A JP2003052149A JP2004260980A JP 2004260980 A JP2004260980 A JP 2004260980A JP 2003052149 A JP2003052149 A JP 2003052149A JP 2003052149 A JP2003052149 A JP 2003052149A JP 2004260980 A JP2004260980 A JP 2004260980A
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stepping motor
driver
motor
current
voltage
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JP2003052149A
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Japanese (ja)
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Shiro Takashima
志朗 高島
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Hitachi Printing Solutions Ltd
日立プリンティングソリューションズ株式会社
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Priority to JP2003052149A priority Critical patent/JP2004260980A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the burnout of a stepping motor, by performing phase switching for the stepping motor before an overcurrent flows into the stepping motor using a transistor or FET driver that has no constant current function, and by detecting a failure if a conduction failure occurs in the driver. <P>SOLUTION: This constant voltage stepping motor drive circuit, that drives a stepping motor at a voltage that exceeds a rated voltage and that performs a drive phase switching for the stepping motor at a predetermined period, is provided with a detecting circuit that can detect a failure of a driver element that drives the motor such as the transistor or the FET, to detect if a conduction failure is occurring in the driver element under a condition that at least the stepping motor is not driven. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
本発明は、例えば、複写機、プリンタ等の画像形成装置に使用される定電圧ステッピングモータの駆動回路の異常検出方法に関する。 The present invention is, for example, a copying machine, concerning the abnormality detection method of a driver circuit of the constant voltage stepping motors for use in an image forming apparatus such as a printer.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
従来のステッピングモータのドライバ駆動回路は、低速回転時は単なるトランジスタを使いモータの定格電圧で動かす定電圧駆動と、定電流ドライバを使いモータの定格電圧以上の電圧を印加して使う定電流駆動があり、定電流駆動は定電流機能を有するICを使用する。 Driver drive circuit of a conventional stepping motor, during low-speed rotation and constant voltage drive to move at the rated voltage of the motor using a simple transistor, the constant current drive to use by applying a rated voltage above the voltage of the motor using a constant-current driver There, constant current drive using an IC having a constant current function. 定圧駆動方式はステピングモータの駆動速度が遅い場合に使用され定電流駆動はステッピングモータの駆動速度が速い場合に使用される。 Pressure driving type constant current drive is used when the drive speed of stearyl ping motor is slow is used when the drive speed of the stepping motor is fast.
【0003】 [0003]
ステピングモータの駆動速度が速い場合に使われる定電流駆動回路は次ぎのようになっている。 Constant current driving circuit for driving speed of stearyl ping motor is used when quick is in the following manner. 電源電圧が+24Vの場合、モータは通常定格電圧5V程度のものが選ばれる。 If the supply voltage is + 24V, the motor having usually about rated voltage 5V is selected. 定格電圧以上の電圧で駆動するためモータの電流の立ち上がりが早く高速回転でもトルクが発生し易い。 Easy torque is generated at rising faster high-speed rotation of the motor current for driving the rated voltage or higher. 定格を越える電圧をステッピングモータに印加し続けると、定格電流を越える電流がモータに流れ、+24Vで定格電圧+5V、定格電流1Aのステッピングモータを駆動した場合は4.8Aの電流がモータに流れ、モータは定格電流を越える電流により過熱し焼損発生の可能性がある。 Continuing to apply a voltage exceeding the rating to the stepping motor, and to the motor current exceeding the rated current, + rated voltage + 5V at 24V, the case of driving the stepping motor of rated current 1A current of 4.8A flows in the motor, motor there is a possibility of burning occurring overheating by current exceeding the rated current. そのためモータが過熱しないよう電流を一定電流で制御する定電流ドライバを使用する。 Therefore to use the constant current driver for controlling the current so that the motor does not overheat at constant current.
【0004】 [0004]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
ステッピングモータは、回転させる場合励磁する巻線を切り換えて1ステップずつロータを動かすことにより回転させる。 Stepping motor rotates by moving the rotor by one step when switching the windings to excite to rotate. ステッピングモータの巻線はインダクターであるため相切り換えを行うと巻線電流の立ち上がりは過渡現象を起こし、巻線電流は徐々に増加する。 Windings of the stepping motor rising of performing the winding current phase switching for a inductor undergoes a transient, winding current increases gradually. そのため、ステッピングモータはステピングモータの定格電圧で使用する場合、電流の立ち上がりが遅く相の切り換えを高速で行うと巻線に電流が流れないため、高速では使用できなかった。 Therefore, the stepping motor when used at the rated voltage of stearyl ping motor, no current flows through the switching rising late phase current performed at high speed winding, could not be used at high speed. 高速で回転させるには巻線電流の立ち上がりを早くするため、ステッピングモータの定格電圧以上の電圧をステッピングモータに印加して巻線電流の立ち上がりを早くする方法が取られる。 To speed the rise of the winding current to rotate at a high speed, a method of fast rise of the winding current by applying a rated voltage above the voltage of the stepping motor to the stepping motor is taken. ステッピングモータに定格電圧以上の電圧を印加すると電流の立ち上がりは早くなるが、結果的にモータの定格電流以上に電流が流れてステッピングモータは焼損してしまう。 Although faster rise of the current upon application of a rated voltage or more to the stepping motor, the stepping motor results in a current flows more than the rated current of the motor ends up burning. このため、ステッピングモータに流れる電流を定格電流で抑えるためにPWM動作を行い定められた電流以上に電流が流れないような定電流ドライバを使用する必要があった。 Therefore, it is necessary to use a constant current driver such that no current flows than the current defined perform PWM operation in order to suppress the current flowing in the stepping motor at rated current.
【0005】 [0005]
定電流ドライバは単なるトランジスタと異なり高価であり、定電流ドライバが導通状態で故障した場合はステッピングモータに定格電流以上の電流が流れ、ステッピングモータの焼損が発生する。 Constant current driver is expensive unlike mere transistors, rated current or more current flows through the stepping motor when the constant current driver fails in the conductive state, burnout of the stepping motor is generated.
【0006】 [0006]
本発明は、定電流機能をもたないトランジスタやFETのドライバを使用してステッピングモータに過電流が流れる前にステッピングモータの相切り換えを行い、かつドライバが導通故障した場合には故障を検出してステッピングモータの焼損を防止することを目的とする。 The present invention, before the overcurrent flows to the stepping motor by using a transistor or FET of the driver without the constant current function performs phase switching of the stepping motor, and detects a fault if the driver is conductive failure and to prevent the burning of the stepping motor Te.
【0007】 [0007]
【課題を解決するための手段】 In order to solve the problems]
上記の目的は、定格電圧を越える電圧でステッピングモータを駆動し、決められた周期でステッピングモータの駆動相の切り換えを行う定電圧ステッピングモータ駆動回路において、トランジスタやFET等のモータを駆動するドライバ素子が故障した場合に検出可能な検出回路を有し、少なくてもステッピングモータを駆動していない状態でドライバ素子が導通故障しているか検出を行うことによって達成される。 The above objects, the stepping motor is driven at a voltage exceeding the rated voltage, the constant voltage stepping motor drive circuit for switching drive phases of the stepping motor at a period which is determined, a driver element for driving a motor such as a transistor or FET There have detectable detection circuit when failure is achieved by the detection or the driver element is conductive failure with fewer not driving the stepping motor even state.
【0008】 [0008]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
図1に本発明のステッピングモータドライバの一実施例を示す。 It shows an embodiment of a stepping motor driver of the present invention in FIG. 相信号発生回路1はステッピングモータの動作/停止を決定する制御信号M_ENB−N3と、ステッピングモータの回転方向を決定する制御信号M_CCW−N2と、ステッピングモータの回転速度を決定するための制御信号M_CLK−N4とで制御される。 Phase signal generating circuit 1 and the control signal M_ENB-N3 to determine the operation / stop of the stepping motor, a control signal M_CCW-N2 to determine the direction of rotation of the stepping motor, the control signal for determining the rotational speed of the stepping motor M_CLK It is controlled by the -N4.
【0009】 [0009]
相信号発生回路1は、制御信号によりトランジスタ5を駆動し、ステッピングモータ6を回転させる。 Phase signal generating circuit 1, a control signal by driving a transistor 5, to rotate the stepping motor 6. ダイオード7のカソードはトランジスタ5のコレクタに接続され、トランジスタ5がオン状態とオフ状態でダイオード7のアノード出力が変化する。 The cathode of diode 7 is connected to the collector of the transistor 5, the anode output of the diode 7 transistor 5 is in the ON state and the OFF state is changed. ダイオード7のアノードは抵抗8と抵抗10で分圧され、ダイオード11とコンデンサ12でノイズ成分を除去して波形整形器13に入力し、論理レベルに変換する。 The anode of the diode 7 is divided by the resistor 8 resistors 10 min, and input to the waveform shaper 13 by removing a noise component in the diode 11 and the capacitor 12, converted into logic levels.
【0010】 [0010]
次に本実施例の動作を説明する。 Next the operation of this embodiment will be described.
【0011】 [0011]
ステッピングモータ6は、停止時かつ非励磁時はM_ENB−N3がデスイネーブル状態になっており、この時はM_CCW−N2とM_CLK−N4の状態に影響されず相信号発生回路1はトランジスタ5をオフする。 Stepping motor 6 is stopped and when de-energized is M_ENB-N3 becomes death enabled state, phase signal generation circuit 1 without being influenced by the state at this stage M_CCW-N2 and M_CLK-N4 off the transistor 5 to. トランジスタ5がオフの状態ではトランジスタ5のコレクタは+24Vになり、ダイオード7は逆バイアスされて非導通となる。 The collector of the transistor 5 the transistor 5 is off becomes + 24V, the diode 7 is non-conductive is reverse biased. この状態では図1のD点の電位は抵抗8と抵抗10で分圧された電圧になる。 Potential at point D in FIG. 1 in this state becomes a voltage divided by the resistor 8 resistor 10. 抵抗8と抵抗10はこの状態で波形整形器13がHレベル入力と認識できる値に設定されている。 Resistor 8 and the resistor 10 is the waveform shaper 13 is set to a value that can be recognized as the H level input in this state. 波形整形器13はトランジスタ5がオンしているとL入力を検出し、オフしている時にはHを件出する。 Waveform shaper 13 detects the L input When the transistor 5 is on, when the turned off to leave matter the H. D点の電圧はトランジスタ5に異常がない場合、トランジスタ5がOFFでH、トランジスタ5がONでLを検出する。 If the voltage at point D there is no abnormality in the transistor 5, transistor 5 H at OFF, the transistor 5 detects a L at ON.
【0012】 [0012]
ステッパ駆動時は定期的に相が切り替わる。 When the stepper drive regularly phase is switched. 図2に示す波形はステッパ駆動時の相電流を示しており、図3は図2に示す電流波形の詳細図である。 Waveform shown in FIG. 2 shows the phase current at the time of the stepper drive, FIG. 3 is a detailed diagram of the current waveform shown in FIG. ある相が励磁された時には電流は過渡現象を起して立ち上る。 When the certain phase has been exciting current rises to cause a transient phenomenon. この時に電流が過渡的に立ち上って行く途中で励磁相の切り換えを繰り返すと、各相電流は一定電流が流れるようになる。 When current when this is repeated switching of the excitation phase on the way to go rose up transient, the phase current is as constant current flows. このときの動作はステッパの定電流ドライバと同様の原理となり、各相の電流は定電流ドライバを使用した場合と同じく一定電流となる。 Operation at this time becomes the same principle as constant current driver of the stepper, each phase current is also constant current to using a constant current driver. この場合、各相に流れる電流は次式のようになる。 In this case, the current flowing through each phase is expressed as follows.
【0013】 [0013]
【数1】 [Number 1]
【0014】 [0014]
Io:相電流V:電源電圧L:モータの巻線インピーダンスR:巻線抵抗t:励磁切り換えからの時間図4はA相が導通故障している場合であり、モータの駆動以前にD点がLであることを検出しトランジスタの導通故障を検出できる。 Io: phase current V: supply voltage L: winding impedance of the motor R: winding resistance t: Time Figure 4 from the excitation switching is a case where phase A is conducting failure, D points to the drive before the motor is It detects that a L can detect the conduction failure of the transistor.
【0015】 [0015]
本実施例では、ステッピングモータの定格を越える電圧を印加してモータをドライブするため、ヒータOFF中にドライバが導通故障を起した場合にモータの焼損やドライバの焼損を起さないようにドライブ停止時のドライバOFFをチェックする。 In this embodiment, for driving the motor by applying a voltage exceeding the rating of the stepping motor, the drive is stopped so as not to cause burnout of the motor burnout or drivers when the driver has caused conduction failure in the heater OFF to check the driver OFF of time. ドライバ停止時にドライバの導通を検出した場合、モータおよびドライバの焼損防止のためドライブ電源の給電カット処理を行う。 When detecting the continuity of the driver when the driver is stopped, for supplying power cut processing of the drive power source for burning prevention of motor and driver.
【0016】 [0016]
【発明の効果】 【Effect of the invention】
本発明によれば、ドライバを定電流機能のないトランジスタ等の単なる半導体スイッチを使う事により安価かつ小形のステッピングモータを提供でき、かつ、定格電圧以上の電圧で駆動する場合に問題となるドライバ異常時のモータ焼損防止のプロテクトをドライバの導通異常チェックを行うことにより、安全なステッピングモータドライバを提供できる。 According to the present invention can provide an inexpensive and compact stepping motor by using a simple semiconductor switches such as a transistor without a constant current function driver, and the driver abnormality becomes a problem when driving the rated voltage or higher by performing the conduction abnormality check of the protection of the motor burnout prevention when the driver, can provide a secure stepping motor driver.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【図1】本発明の一実施例を示す回路図。 Circuit diagram showing an embodiment of the present invention; FIG.
【図2】本発明の一実施例における正常時動作波形図。 [2] Normal operation waveform diagram in an embodiment of the present invention.
【図3】本発明の一実施例における正常時動作波形の電流詳細図。 [3] Current detailed view of the normal operation waveforms in the embodiment of the present invention.
【図4】本発明の一実施例における異常発生時動作波形図。 [4] abnormal operation waveform diagram in an embodiment of the present invention.
【符号の説明】 DESCRIPTION OF SYMBOLS
1 相信号発生回路2 M_CCW−N(制御信号) 1-phase signal generating circuit 2 M_CCW-N (control signal)
3 M_ENB−N(制御信号) 3 M_ENB-N (control signal)
4 M_ENB−N(制御信号) 4 M_ENB-N (control signal)
5 トランジスタ6 ステッピングモータ7、11 ダイオード8、10 抵抗12 コンデンサ13 波形整形器 5 transistor 6 stepper motor 7,11 diode 8,10 resistor 12 capacitor 13 waveform shaper

Claims (1)

  1. 定格電圧を越える電圧でステッピングモータを駆動し、決められた周期でステッピングモータの駆動相の切り換えを行う定電圧ステッピングモータ駆動回路において、トランジスタやFET等のモータを駆動するドライバ素子が故障した場合に検出可能な検出回路を有し、少なくてもステッピングモータを駆動していない状態でドライバ素子が導通故障しているか検出を行うことを特徴とする定電圧ステッピングモータ駆動回路の異常検出方法。 Drives the stepping motor at a voltage exceeding the rated voltage, the constant voltage stepping motor drive circuit for switching drive phases of the stepping motor at a period which is determined, if the driver element for driving a motor such as a transistor or FET fails It had detectable detection circuit, less a constant voltage stepping motor drive circuit, characterized in that to detect whether the driver element in a state of not driving the stepping motor is conducting the fault also anomaly detection method.
JP2003052149A 2003-02-28 2003-02-28 Method for detecting abnormality in constant voltage stepping motor drive circuit Pending JP2004260980A (en)

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US9934920B2 (en) 2006-05-19 2018-04-03 Ethicon Endo-Surgery, Inc. Force switch
US8627993B2 (en) 2007-02-12 2014-01-14 Ethicon Endo-Surgery, Inc. Active braking electrical surgical instrument and method for braking such an instrument
US10314592B2 (en) 2016-05-10 2019-06-11 Ethicon Llc Electrically self-powered surgical instrument with cryptographic identification of interchangeable part
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