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When designing circuits, engineers need to know the voltages and intensities at every point in the circuit. In simple circuits the results can be calculated by hand by using complex numbers, but in complex circuits this is impossible. This is why, nowadays, recourse is had to computer simulation so that circuits can be designed before being built, since it eliminates the need to build prototypes of the circuits with the ensuing time and cost. Bond-graph technique is a visual methodology that adds more transparency to the processes and it has turned out to be remarkably useful as it is a simple, effective method that can be applied to any physical system where there is a power exchange.This work initially analyses the starting mechanism of a direct current machine using bond graph technique, compares it with a model developed in Simulink copy and then stabilises the running of the motor by using a type PI controller.