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Abstract
Remarkably complex behaviour, namely chaos, in voltage-mode controlled DC drive systems has been investigated. An iterative mapping that describes the nonlinear system dynamics in the continuous conduction mode is derived. It shows that different bifurcation diagrams can be obtained from different system parameters, and that the systems generally exhibit a period-doubling route to chaos. Analytical modelling of period-1 and hence the period-p orbits, as well as their stability analysis using the characteristic multipliers, is presented. Thus the stable ranges of various system parameters can be determined. The theoretical results are verified by using experimental measurement.