The Self-Excitation Of Induction Machines With Application To Motor Starting

The self-excitation of polyphase induction motors having stator circuit shunt capacitors is reviewed in this paper. The criterion for self-excitation of a coasting motor and capacitor combination, which has been disconnected from the line, is derived by a dynamic analysis using d-and q-axis variables. The criterion has been confirmed by analog simulation. Also reported are studies of a novel method, employing motor self-excitation, for starting squirrel cage motors. The method may have application where it is important to minimize the system voltage dips that accompany motor starting.