Electrical Machines 2

Unit 1

Synchronous Machine-I Constructional features, Armature winding, EMF Equation, Winding coefficients, Equivalent circuit and phasor diagram, Armature reaction, O. C. & S. C. tests, Voltage regulation using Synchronous Impedance method, MMF method, Potier’s Triangle method, Voltage and frequency control (Governer system) of alternators , Parallel operation of synchronous generators, Operation on infinite bus, Synchronizing power and torque co- efficient.

Unit 2

Synchronous Machine II Two reaction theory, Transient and sub-transient reactance, Power flow equations of cylindrical and salient pole machines, Operating characteristics. Synchronous Motor - Starting methods, Effect of varying field current at different loads, V- curves, Hunting & damping, Synchronous condenser.

Unit 3

Three phase Induction Machine - I Constructional features, Rotating magnetic field, Principle of operation, Phasor diagram, Equivalent circuit, Torque and power equations, Torque- slip characteristics, No load & blocked rotor tests, Efficiency, principle of operation and application of induction generator

Unit 4

Three phase Induction Machine- II Starting, Deep bar and double cage rotors, Cogging & Crawling, Speed control (with and without emf injection in rotor circuit).

ELECTRICAL & ELECTRONICS ENGINEERING Curriculum & Evaluation Scheme EN (V & VI semester)

Unit 5

Single phase Induction Motor Double revolving field theory, Equivalent circuit, No load and blocked rotor tests, Starting methods, Repulsion motor, Universal motor.