Positional control system with backlash compensation
Abstract
Abstract A POSITIONAL CONTROL SYSTEM IS DISCLOSED WHICH INCLUDES MEANS FOR AUTOMATICALLY COMPENSATING FOR BACKLASH IN THE FEED SCREWS COUPLING THE DRIVE MOTORS TO THE DRIVEN MACHINE MEMBER. WHEN THE DISPLACEMENT OF THE MACHINE MEMBER ALONG A GIVEN AXIS IS TO BE IN THE SAME DIRECTION AS THE PRECEDING DISPLACEMENT ALONG THAT AXIS, A DIRECTION COMPARATOR ROUTES CONTROL PULSES TO THE DRIVE MOTOR THROUGH A POSITION CONTROL. THE NUMBER OF PULSES TRANSMITTED TO THE MOTOR IS DETERMINED BY A COUNTER WHICH HAS BEEN SET TO CUT OFF THE POSITION CONTROL WHEN THE NUMBER OF TRANSMITTED PULSES CORRESPONDS TO THE MAGNITUDE OF THE DESIRED DISPLACEMENT. WHEN THE DISPLACEMENT OF THE MACHINE MEMBER IS IN THE OPPOSITE DIRECTION FROM THE PRECEDING DISPLACEMENT ALONG A GIVEN AXIS, THE DIRECTION COMPARATOR ROUTES THE CONTROL PULSES TO THE DRIVE MOTOR THROUGH A BACKLASH CONTROL. THE NUMBER OF PULSES TRANSMITTED TO THE MOTOR IS CONTROLLED BY A BACKLASH STORAGE UNIT WHICH IS PRESET TO CUT OFF THE BACKLASH CONTROL THROUGH THE DIRECTION COMPARATOR AND SWITCH THE PULSES TO THE POSITION CONTROL WHEN THE MOTOR ROTATION IS EQUAL TO THE FEED SCREW BACKLASH.
Inventors
- 👤 Walter A Steinberg
Bibliographic Details
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