Simplified Design of CDM Controllers for Speed Control of Two-inertia Systems

P. Boonyounga and T. Benjanarasuthb

Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand.


In this paper, the simplified design of CDM controllers for a higher-order plant by using concepts of the plant model order reduction and Coefficient Diagram Method with the recommended stability index is presented. First, the lower-order plant models of a higherorder plant are obtained by using the Padé type approximation method, Routh stability criterion and stability equation approach. Then the lower-order CDM controllers are designed for the lower-order plant models. Finally, each lower-order CDM controller is employed to control the original higher-order plant. The effectiveness of the controllers designed by the proposed method are verified by simulations and experiments.

Keywords: Coefficient diagram method, Model order reduction, Two-inertia system, Speed control, Resonance suppression.

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