Electrical Machines 2

Unit I

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 andtorque co- efficient.

Unit II

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 III

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 IV

Three phase Induction Machine- II: Starting, Deep bar and double cage rotors, Cogging & Crawling, Speed control (with and without emf injection in rotor circuit). Curriculum & Evaluation Scheme EE (V & VI semester) Page 9 ELECTRICAL ENGINEERING

Unit V

• P S Bimbhra, "Electrical Machinery", Khanna Publisher
• I J Nagrath & D.P. Kothari, "Electrical Machines", McGraw Hill nd
• Irving Kosow, “Electric Machinery and Transformers”, 2 Edition
• Rajendra Prasad , "Electrical Machines", PHI Learning Pvt. Ltd,
• AE Fitzgerald, C. Kingsley Jr and Umans, "Electric Machinery", McGraw Hill, International Student Edition. Reference Books:
• H. Cotton, "Electrical Technology", CBS Publication.
• MG Say, "The Performance and Design of AC machines", Pitman& Sons.
• PS Bimbhra, "Generalized Machine Theory” Khanna Publishing.
• Samarjit Ghosh, " Electrical Machines", Pearson Education Curriculum & Evaluation Scheme EE (V & VI semester) Page 10 ELECTRICAL ENGINEERING

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