ELE-502 ENERGY CONVERSION - II

Fundamental principle of AC machines: EMF equation, phase and phase difference, phase sequence, relation between speed and frequency, armature winding, integral slot winding, full pitch and short pitch winding, winding factors, factors affecting induced EMF, armature reaction, rotating magnetic field, magnetizing reactance, leakage reactance

Synchronous generator: Constructional features of salient pole and non-salient pole machines, arrangement of field wining in the two types of machines

Cylindrical rotor theory: The general phasor diagram, synchronous reactance from O.C. and S.C. characteristics, load characteristics, ZPF characteristics, voltage regulation- the Emf method, the MMF method, power angle characteristics, capability diagram

Salient pole theory: Blondel’s two reaction theory, direct axis and quadrature axis synchronous reactance, power angle characteristics, slip test and maximum lagging current test

Parallel operation: Necessity of parallel operation, conditions to be satisfied for parallel operation, synchronization, effect of wrong synchronizing, load division

Synchronous motor: General physical considerations, phasor diagram, torque and power relations in non-salient pole and salient pole motors, V-curves, various types of excitation, synchronous condenser, methods of starting, applications

Three phase induction motor: Constructional features of slip ring and squirrel cage type motors, principle of operation, flux and MMF waves, no load speed and slip, variance constants, rotor quantities referred to stator, relationship between input voltage and equivalent circuit, analysis of equivalent circuit, torque-speed characteristics, normalized torque speed characteristics, starting, maximum and full load torque, condition for maximum torque, regions for stable and unstable operation, speed torque characteristics of different rotor resistance, speed-torque characteristics for different frequencies, losses and efficiency, performance characteristics - effect of rotor resistance, the circle diagram

Starting: Starting of slip ring and squirrel cage motors, high starting torque motors

Speed control: Pole changing motors, line frequency control, line voltage control, rotor resistance control

Single phase induction motor: Construction, theories of operation, rotating magnetic field theory, equivalent circuit, determination of constants for tests, method of starting - split phase starting, capacitance starting, starting characteristics, running performance calculations

TEXTBOOKS:

1. AC machines - by M.G.Say

2. Theory and Principle of AC machines - by A. Langsdorff

3. Performance and design of AC commutator motor - by E.O.P. Taylor

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