Speed control of series DC motor: a bond graph based backstepping design

A speed-tracking problem is solved on a series DC-motor via a bond graph based backstepping technique. A switched excitation circuit allowing for field-weakening demands two designs, each of them being accomplished via a basic methodology combining backstepping and an elementary tracking design. A Lyapunov-redesign method is further applied in order to assure closed loop asymptotic stability of the whole system. The essential BG concepts and techniques used in the methods are minimal paths, bicausality and I-O inversion. The bond graph technique gives physical insight into the choice of the intermediate variables for the backstepping design. The controller performance is shown with the help of digital simulation results.