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    • 8. 发明授权
    • Control circuit for DC capstan motor
    • 直流主动马达控制电路
    • US4482850A
    • 1984-11-13
    • US422566
    • 1982-09-24
    • Masakazu SonodaTakashi TerajimaMinoru Ozawa
    • Masakazu SonodaTakashi TerajimaMinoru Ozawa
    • G11B15/18G11B15/20G11B15/467G11B15/48G11B15/54H02P3/08H02P7/06H02P23/00H02P3/10
    • G11B15/1808G11B15/1875G11B15/20H02P23/16H02P23/186H02P3/08H02P7/06G11B15/4673G11B15/48G11B15/54
    • A control circuit is used during slow or stop-motion playback operation of a video tape device to drive video tape intermittently. In order to avoid errors in the stopping position of the tape, a pulse width modulated (PWM) signal is provided to a motor controller circuit associated with the capstan motor of the video tape device. A frequency signal generator coupled to this motor generates a frequency signal that varies with the capstan motor speed, and this frequency signal is provided to a retrigger monostable multivibrator which generates a PWM signal whose duty ratio changes in proportion to the capstan motor speed. A drive pulse generator and a brake pulse generator provide drive start and brake start signals, respectively, when it is desired to commence and stop movement of the tape. A drive circuit, including the retrigger monostable multivibrator, receives the drive start signal, the brake start signal, and the frequency signal to generate the PWM signal which is supplied to the motor controller circuit. The frequency signal is selected to have a pulse rate several tens of times the ripple frequency of the motor's torque ripple characteristic so that inaccuracies in stopping position of the motor are eliminated.
    • 在录像带设备的慢速或停止运动播放操作期间使用控制电路来间歇地驱动视频磁带。 为了避免磁带停止位置的错误,将脉冲宽度调制(PWM)信号提供给与录像带装置的主导轴电机相关联的电机控制器电路。 耦合到该电动机的频率信号发生器产生随主导轴电动机速度而变化的频率信号,并且该频率信号被提供给再触发单稳态多谐振荡器,其产生占空比与主导轴电动机速度成比例地变化的PWM信号。 当需要开始和停止磁带的移动时,驱动脉冲发生器和制动脉冲发生器分别提供驱动启动和制动启动信号。 包括再触发单稳态多谐振荡器的驱动电路接收驱动开始信号,制动开始信号和频率信号,以产生提供给马达控制器电路的PWM信号。 选择频率信号具有电机转矩脉动特性的脉动频率几十倍的脉冲频率,从而消除电机停止位置的不准确。