D.c. Machines and Synchronous Machines
Classification of D.C. generator, Types of armature winding, E.M.F. equation, Armature reaction, Commutation, No load and load characteristics, Use of interpoles & compensating winding (only qualitative treatment).
Classification, Back E.M.F. equation, Torque equation, Characteristics of shunt, series & compound motors, Speed control of shunt and series compound motors, Losses in D.C. machines both generator and motor.
Losses and efficiency, Direct and indirect methods of testing of D.C. machines, Permanent magnet D.C. motors and brushless D.C. motors, Applications of D.C. motors, Power flow diagram (all tests to be discussed).
Basic principle of operation, Construction of salient and non-salient pole synchronous machines, Generated E.M.F., Effect of distribution of winding and use of chorded coils.
Voltage regulation by EMF, MMF, ZPF & ASA method
Synchronizing to infinite bus bars, Parallel operation of alternators. Operating characteristics, Power angle characteristics, Excluding armature resistance, Operating for fixed input and variable excitation and vice versa for both generating and motoring mode, V curves of synchronous machines, Power flow equations including armature resistance, Capability curves of synchronous generators, Hunting in synchronous machines, Damper winding, Starting methods for hunting in synchronous machines.
Salient pole synchronous machines, Two-reaction theory, Power angle diagram, Reluctance power, Slip test.
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C Generators 11 to 1102
Chapter3 Testing of DC Machines 31 to 366
Examples with Solutions 3 27
Review Questions 363
Chapter 5 Methods for Calculating Regulation of Alternator 5 1 to 5
Chapter 6 Synchronization and Parallel Operation of Alternators 6 1 to 6 108
Chapter 7 Synchronous Motors 71to784
Appendix A Starting of D C Motors A1toA
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0.8 lagging armature conductors Armature copper loss armature current armature reaction armature resistance armature winding axis back e.m.f. brush bus bar Calculate characteristics coil sides commutator segments component constant copper loss D.C. Machines d.c. motor d.c. shunt motor delta connected Ebph efficiency equation excitation field current field resistance field winding full load current Hence Ia Ra Iaph increases induced e.m.f. Key Point lagging p.f. load condition Machines & Synchronous maximum method open circuit Operation of Alternators output parallel phasor diagram power developed power factor Refer example Refer section Regulation of Alternator rheostat rotor series field short circuit shown shunt field slip rings slots Solution star connected alternator stator Stray losses synchronizing power synchronous condenser synchronous impedance Synchronous Machines synchronous motor synchronous reactance synchronous speed terminal voltage three phase torque volts zero