Abstract
The open-loop transfer function of a complex Ward-Leonard dynamometer system was derived from an analysis of the behaviour of the individual components. The resulting model, which was in good agreement with the open-loop performance of the system, was used to simulate the behaviour of the closed-loop system; this indicated that the system would be unstable.
Classical control theory was used to analyse the performance of a number of stabilizing control strategies, and root loci plots, Bode diagrams and Nichols charts were used to assess the resultant performance. A proportional-plus-integral controller combined with lead compensation was predicted to provide acceptable control. The performance of the system with this controller installed was found to satisfy the design requirements of speed of response, limited overshoot and zero steady-state error.
Get full access to this article
View all access options for this article.