Syllabus Electrical Machines - II (BE04009011) Total Credits = TH/30 Assessment Pattern and Marks Total Marks Theory Tutorial / Practical ESE (E) PA (M) PA (I) PBL (I) ESE (V) 4 70 30 20 30 50 200 Unit No. Content 1. DC Machines : Construction and Working : Basic construction and operating principles. DC Generator : Induced EMF equation, field excitation types (separately excited, shunt, series), voltage build-up in a shunt generator, critical field resistance and speed. DC Motor : Back EMF and torque equations, armature circuit equation, field excitation types, performance characteristics, and speed control methods. Losses and Efficiency : Overview of losses and efficiency considerations. (Chapters - 1, 2) 2. Synchronous machines : Constructional Details, Working Principle, Types of rotor (cylindrical and salient pole), Rotating Magnetic Field, EMF equation, Armature winding (Effect of distribution factor, pitch factor). Armature Reaction, its effects and remedies. (Chapter - 3) 3. Synchronous Generator (Alternator) : Equivalent circuit & Phasor diagram of synchronous machine as generator in different load conditions (R, L, C), Armature reaction and its compensation, Power output equation. SCR and its effects, Voltage Regulation, Methods to find voltage regulation : Synchronous impedance method, MMF method, ZPF method, Operating characteristics of synchronous machines, Effects of harmonics on induced emf, Salient pole machine - two reaction theory, power angle characteristics, Sudden short circuit and unbalance conditions, Hunting, Losses and efficiency, Parallel Operation and Synchronization, Operation on load & infinite bus, Synchronous Generator capability characteristics. (Chapter - 3) 4. Synchronous motors : Expression for torque, Phasor diagram of Synchronous motor, Starting methods of synchronous motor, Speed regulation, Effect of excitation, Losses and efficiency of motor, Application of synchronous motor as phase modifier and synchronous condensers. V-curves of Synchronous motors, Power developed by Synchronous motor and stability, Power stages. (Chapter - 4) 5. Special machines : Permanent Magnet DC Motor (PMDC) : Construction, working, and applications. Brushless DC Motor (BLDC) : Construction, working principle, control techniques, and applications. Permanent Magnet Synchronous Machine (PMSM) : Types (SPMSM, IPMSM), operation and applications. Stepper Motor : Types (Variable reluctance, Permanent Magnet, Hybrid), working principle and applications. Switched Reluctance Motor (SRM) : Construction, working and applications. Servo Motor : AC & DC servo motors, working, and industrial applications. (Chapter - 5)
