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公开(公告)号：US4065074A
公开(公告)日：1977-12-27
申请号：US692175
申请日：1976-06-02
摘要： A tape reel servo control system for use with a tape transport system wherein tape loop position within vacuum loop boxes is maintained by digital techniques as opposed to analog techniques. In normal operation when the tape loop deviates from an equilibrium position in one direction within a loop box, its associated reel is accelerated to move it back to its equilibrium position by means of a series of motor drive pulses whose pulse lengths are determined by the count registered in a counter wherein the count is varied in accordance with the difference between actual and required acceleration of the reel. When the tape loop deviates from the equilibrium position in the other direction, the reel drive motor is braked by electronically shorting its terminals until the tape loop moves back to its equilibrium position. When the direction of tape movement is changed, means are provided which override the normal control of the system and prevents tape damage by overrun into or removal of the tape from its associated loop box by applying a combination of motor braking and plugging current to the motor drive.
摘要翻译： 一种与磁带传送系统一起使用的磁带卷轴伺服控制系统，其中与模拟技术相反，通过数字技术维持真空环路盒内的磁带环位置。 当磁带回路在一个环路箱内从一个方向的平衡位置偏离时，在正常操作中，通过一系列电机驱动脉冲将其相关联的卷轴加速回到其平衡位置，脉冲长度由计数 注册在计数器中，其中计数根据卷轴的实际加速度和所需的加速度之差而变化。 当磁带环在另一方向偏离平衡位置时，通过电子短路其端子直到磁带回到其平衡位置来制动卷轴驱动电动机。 当磁带移动的方向改变时，提供了覆盖系统的正常控制的装置，并且通过将马达制动和堵塞电流的组合应用于马达来防止磁带从其相关联的回路箱中超出或移除或移除磁带的损坏 驾驶。
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公开(公告)号：US4084159A
公开(公告)日：1978-04-11
申请号：US719768
申请日：1976-09-02
CPC分类号： G01S13/68
摘要： An antenna tracking system in which attenuation of gain in the azimuth tracking circuit as a function of the angle of elevation of the antenna is compensated. A correction circuit is provided in the servo loop for amplifying the azimuth error signal and rate gyro signal by an amount equal to the secant of the elevation angle.
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