John G. Bollinger

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A mathematical analysis of a typical sampled-data servo-drive for computer numerical control (CNC) machine tools is presented with the objective of providing the control engineer with useful design charts for the selection of system parameters. A mathematical model is first developed which facilitates the evaluation of the relation between servo-loop gain(More)
It is shown that the SCR dc feed drive stiffness depends upon the torque and speed of the motor. In particular, changing from continuous to discontinuous conduction in the armature circuit has a significant effect upon the drive stiffness. Analytic expressions for both static and dynamic stiffnesses are derived, and computer-calculated diagrams of the(More)
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