ADAPTIVE PULSE-PUMP CONTROLLER FOR X-Y MODE FREQUENCY-LOCKED STEPPINGSERVOMECHANISM

A microprocessor-based adaptive pulse-pump controller (mu P-APPC) for X-Y mode frequency-locked stepping position servo control system (XY-F LSPS) is proposed. A control strategy in mu P-APPC for fasting the sys tem locking process is developed. A discrete frequency set is built to represent the servo position so as to raise the accuracy of position lock and reduce the conversion error in the signal processing, The mu P-APPC can respectively provide proper X's and Y's motion profiles for guiding their movements according to the detected position errors, An X-Y pulse rate identifier (XY-RI) is built to prescribe the instant X -axis and Y-axis motion speeds so that both X and Y motors can reach t he target at approximately the same time, System modeling for analysis and computer simulation is constructed, A prototype of the XY-FLSPS w ith mu P-APPC controller is developed for assessing system performance , and the X-Y position and speed responses are described by three-dime nsional display.