UNIT - I Poly-Phase Induction Machines : Constructional details of cage and wound rotor machines - production of a rotating magnetic field - principle of operation - rotor EMF and rotor frequency - rotor reactance, rotor current and Power factor at standstill and during operation. (Chapter - 1) UNIT - II Characteristics of Induction Machines : Rotor power input, rotor copper loss and mechanical power developed and their inter relation-torque equation-deduction from torque equation - expressions for maximum torque and starting torque - torque slip characteristic - equivalent circuit - phasor diagram - crawling and cogging - .No - load Test and Blocked rotor test - Predetermination of performance - Methods of starting and starting current and Torque calculations. Speed Control Methods : Change of voltage, change of frequency, voltage/frequency, injection of an EMF into rotor circuit (qualitative treatment only) - induction generator - principle of operation. (Chapter - 2) UNIT - III Synchronous Machines : Constructional Features of round rotor and salient pole machines - Armature windings - Integral slot and fractional slot windings; Distributed and concentrated windings - distribution, pitch and winding factors - E.M.F Equation. Harmonics in generated e.m.f. - suppression of harmonics - armature reaction - leakage reactance - synchronous reactance and impedance - experimental determination - phasor diagram - load characteristics. Regulation by synchronous impedance method, M.M.F. method, Z.P.F. method and A.S.A. methods - salient pole alternators - two reaction analysis - experimental determination of and (Slip test) Phasor diagrams - Regulation of salient pole alternators. (Chapter - 3) UNIT - IV Parallel Operation of Synchronous Machines : Synchronizing alternators with infinite bus bars - synchronizing power torque - parallel operation and load sharing - Effect of change of excitation and mechanical power input. UNIT - V Single Phase & Special Machines
