Equivalent Circuits for the Hunting of Electrical Machinery

A general method is given to establish equivalent circuits for the determination of the hunting characteristics¿ such as damping and synchronizing torques¿of standard types of electrical machines. The method is illustrated by setting up steady-state and hunting equivalent circuits for the salient-pole synchronous machine having amortisseur windings and for the doubly fed single-phase Selsyn with unbalanced windings, special cases of which are the capacitor motor and doubly fed polyphase motor. A companion paper, ``The Doubly Fed Machine,´´ contains a detailed study of the characteristics of one of the equivalent circuits as measured on the a-c network analyzer.