## Electromechanical Energy Conversion - IiSynchronous Machine I Constructional features, Armature winding, E.M.F. equation, Winding coefficients, Equivalent circuit and phasor diagram, Armature reaction, O.C. and S.C. tests, Voltage regulation using synchronous impedance method, M.M.F. method, Potier's triangle method, Parallel operation of synchronous generators, Operation on infinite bus, Synchronizing power and torque co-efficient. Synchronous Machine II Two reaction theory, Power flow equations of cylindrical and salient pole machines, Operating characteristics.Synchronous Motors Starting methods, Effect of varying field current at different loads, V-Curves, Hunting and damping, Synchronous condensor. Three Phase Induction Machine - IConstructional features, Rotating magnetic field, Principle of operation, Phasor diagram, Equivalent circuit, Torque and power equations. Torque-slip characteristics, No load and blocked rotor tests, Efficiency, Induction generator.Three Phase Induction Machine - II Starting, Deep bar and double cage rotors, Cogging and Crawling, Speed control (with and without e.m.f. injection in rotor circuit).Single Phase Induction Motor Double revolving field theory, Equivalent circuit, No load and blocked rotor tests, Starting methods, Repulsion motor.A.C. Commutator Motors Universal motor, Single phase a.c. series compensated motor, Stepper motors. |

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### Contents

Chapter 2 Methods for Calculating Regulation of Alternator | 1-57 |

Chapter 3 Synchronization and Parallel Operation of Alternators 3 1 to 3 | 3-2 |

Examples with Solutions 3 63 | 3-62 |

Review Questions 3 90 | 3-89 |

Chapter 9 Special Machines 91 to 9 28 | 5-9 |

Circle Diagram 61 to632 | 6-1 |

Chapter 9 Special Machines 0 1 to 9 | 9-1 |

Review Questions 9 | 9-27 |

### Common terms and phrases

0.8 lagging armature current armature reaction armature resistance armature winding bus bar Calculate circuit test coil side component conductors constant copper losses delta connected e.m.f. per phase Ebph Eiph electrical EMEC EMEC-II equation equivalent circuit ERph excitation field current field winding frequency full load current Hence Ia Ra)2 Iaph induced e.m.f. induction motor input Key Point lagging p.f. laph leading p.f. leading power factor load condition mechanical number of poles open circuit Operation of Alternators p.f. lagging p.f. load phasor diagram Potier triangle power angle rated terminal voltage reactive power Regulation of Alternator resultant e.m.f. rheostat rotating magnetic field salient pole short circuit short pitch shown in Fig slip rings slots per pole Solution star connected alternator stationary stator supply synchronizing power synchronous motor synchronous reactance synchronous speed three phase alternators torque unity p.f. Voc)ph voltage regulation volts