Excerpt from Hunting of Synchronous Machines: Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in Electrical Engineering in the Graduate School of the University of Illinois, 1912
The phenomenon of hunting has been the chief source of trouble in the Operation of synchronous machines. It was first shown by Dr. John A. Hopkins some twenty years ago that when a pair of generators paralleled electrically and running steadily with an equal division of load have their equilibrium of uniform motion disturbed, by, for ihstance retarding or Speeding up one or the other, a balancing force will be set up with a tendency to restore the state of uniform rotation. This force acts to accelerate the slow machine and retard the fast one, thus tending to keep the system in synchronism. This reference applies equally well to synchronous motors or to synchronous con~ densers fed from alternating current supply mains; there is a tendency to keep the whole system in step.
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