This paper addresses the many issues which confront a designer of a process machine when independent servo-drives are to be incorporated. Actuators which meet process requirements and which maximize servo-drive potential are described. Design and selection criteria for all elements of the total transmission system are discussed: servo-motors, feedback devices, control loop strategies, couplings, gearboxes, transmission belts, motion profiles and control computer systems. The paper draws upon a practical system which incorporated ten servo-drives cycling at 13 Hz with positional accuracies of 0.4 mm at 2.1 m/s.
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