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http://dx.doi.org/10.7839/ksfc.2016.13.3.015

PID Controller and Derivative-feedback Gain Design of the Direct-drive Servo Valve Using the Root Locus and Manual Tuning  

Lee, Seong Rae (Department of Mechanical Engineering, Konyang University)
Publication Information
Journal of Drive and Control / v.13, no.3, 2016 , pp. 15-23 More about this Journal
Abstract
The direct-drive servo valve(DDV) is a kind of one-stage valve because the main spool valve is directly driven by the dc motor. Since the DDV structure is simple, it is less expensive, more reliable, and offers a reduced internal leakage and a reduced sensitivity to fluid contamination. The control system of the DDV is highly nonlinear due to a current limiter, a voltage limiter, and the flow-force effect on the spool motion. The shape of the step response of the DDV-control system varies considerably according to the magnitudes of the step input and the load pressure. The system-design requirements mean that the overshoots should be less than 20%, and the errors at 0.02s should be less than 2%, regardless of the reference-step input sizes of 1V and 5V and the load-pressure magnitudes of 0MPa and 20.7MPa. To satisfy the system-design requirements, the PID-controller parameters of $K_c$, $T_i$ and $T_d$, and the derivative-feedback gain of $K_{der}$ are designed using the root locus and manual tuning.
Keywords
Direct Drive Servo Valve; PID Controller; Derivative Feedback Gain; Manual Tuning; Root Locus;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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