Electrical Machines III

Transformers: Core types and shapes, winding, cooling; in rush currents; harmonics in three phase transformers; parallel operation; autotransformers, instrument transformer, satiable reactors. DC machines: review of excitation methods and performance characteristics; armature reaction, interlopes, compensating windings; rating and efficiency; universal motor, permanent magnet motor. Induction motor: Three phase induction motor winding, rotor types, circle diagram, ratings, control methods; single phase induction motors -types and methods of starting, performance review and applications; synchros, linear induction motors. Synchronous Machines: Types -salient and cylindrical; circle diagrams and V-curves; synchronous generator on infinite busbar; parallel operation.