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By D. R. Wilson (Eds.)

ISBN-10: 0080158129

ISBN-13: 9780080158129

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References discussing Nichols charts: 3, 5, 11. References discussing root locus: 3, 6, 14, 15. References discussing Routh's criterion: 3, 7, 11, 13, 14, 16. CHAPTER 2 PRELIMINARY DESIGN OF A LARGE SERVOMECHANISM D. R. WILSON and J. B. 1. Introduction Chapter 1 has summarized basic servomechanism theory and it is the objective of this chapter to illustrate the application, and where necessary extend the theory, to the pre­ liminary design of a servomechanism. A typical industrial example of a servo control scheme is the speed control of the rolls in a sheet steel rolling mill.

The practical significance is that the output of a type 1 position control servo, for example, will follow an input having constant velocity with a position error, but by adding an additional integration in the forward path and making a type 2 servo, this error can be made zero. In practice the specification is used to select the most suitable type number, and the required open loop gain as a function of frequency can normally be deduced from the same source. The next step is to choose the servomotor and match its output torque to meet the load requirements using a gearbox.

Is driven at constant speed by an induction motor or synchronous motor. 23) where K is the generator gain constant (V/A), Kg is the ampUfier gain (V/V), Rf is the generator field resistance, and Lf is the generator field inductance. The Ward-Leonard drive can provide considerable voltage (and power) gain, the penalty being the inclusion in the control loop of the generator field time constant Lf/Rf. In a typical servo this is usually the second largest time constant, the electromechanical time constant [see eqn.

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Modern Practice in Servo Design by D. R. Wilson (Eds.)

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