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AssigneeThe United States of America as represented by the United States Department of Energy
InventorWalter L. Green
Estimating the term…
An improved continuous-path-positioning servo-control system is provided for reducing the effects of friction arising at very low cutting speeds in the drive trains of numerically controlled cutting machines, and the like. The improvement comprises a feed forward network for altering the gain of the servo-control loop at low positioning velocities to prevent stick-slip movement of the cutting tool holder being positioned by the control system. The feed forward network shunts conventional lag-compensators in the control loop, or loops, so that the error signal used for positioning varies linearly when the value is small, but being limited for larger values. Thus, at higher positioning speeds there is little effect of the added component upon the control being achieved.
In a continuous-path-positioning servo system wherein a position error signal is generated and fed to a drive means by comparing a command position signal with a feedback position signal indicative of the actual position of an object positioned by said drive means in a position control loop including a position lag compensation network series connected within said position control loop and a velocity feedback control loop operatively connected within said position control loop including a velocity lag compensation network series connected with said velocity control loop and said position control loop, the improvement comprising:
Dependencies are inferred from the claim text.