Feedback techniques applied to the single-phase transformer

THE ANALYSIS of electric machines makes use of the vector diagram and the equivalent circuit diagram. Both of these methods give the various quantities sought (current, voltage, torque, etc.) under conditions of steady-state operation. When electric machines are used as elements in a general control system, one should rather apply the same techniques used for system analysis to the performance calculation of the particular element. In this case one is more interested in the machine's dynamic behavior, lag or lead it introduces, band width, frequency response, and an easy method for computing the modification or compensation it causes.