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    • 28. 发明授权
      US3612976A Position control system 失效
    • Position control system
    • US3612976A
    • 1971-10-12
    • US3612976D
    • 1969-04-09
    • INDUCTOSYN CORP
    • TRIPP ROBERT W
    • G05B19/18 , G05B19/39
    • G05B19/18 , G05B19/39 , G05B2219/33268 , G05B2219/35436 , G05B2219/35481 , G05B2219/36366 , G05B2219/41363 , G05B2219/42118 , G05B2219/43194 , G05B2219/50018
    • A control system for positioning a machine member from an initial position to a new command position. The member is moved by appropriate motor and control means in cooperation with a delta counter the contents of which continuously represent distance remaining to travel. Initially, data representing the command position are read into temporary storage and compared with data, representing the initial position of the machine member, contained in another (external) counter. A series of pulses, herein designated Delta RCT, increment or decrement the other counter, depending on whether the data in temporary storage is greater than or less than the data in the other counter. Simultaneously, the Delta RCT pulses increment the delta counter away from zero. When the contents of the other counter and temporary storage become equal, generation of the Delta RCT pulses is inhibited; the delta counter then contains how far the machine member must travel to get to the command position. As the machine member moves toward the command position, a second series of pulses (herein designated RCT), each representing motion through an incremental distance, decrement the delta counter toward zero. As the delta counter contents decrease, indicating less distance to go, appropriate speed control signals are provided to slow down the motor. When the delta counter decrements to a predetermined value corresponding to a selected distance from the command position, the motor may be deenergized and the machine member coasts to a halt. Alternatively, when the delta counter reaches the predetermined value, a servosystem may be actuated which drives the member to the command position. Should the member stop at other than the command position, the residual contents of the delta counter will represent the positioning error. The delta counter then is decremented to zero, and the contents of the other counter thereby correspondingly altered so as to represent the actual stop position. Additionally, the system includes storage of zero offset data. This feature has the advantage of resuming operation after an interruption, automatically, without extensive setting up operation or computation.
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