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BEE401 SYNCHRONOUS MACHINES AND INDUCTION MACHINES


OBJECTIVE: On completing the course, students will be able to operate and predict the performance of synchronous and asynchronous motors and generators.

1. ALTERNATORS


Alternators - types and constructional features - emf equation - rotating magnetic field - armature reaction - load characteristics - predetermination of regulation by synchronous Impedance method, Ampere turn method, Zero Power factor method and ASA method. Basic ideas of two reaction theory - direct and quadrature axis reactances and their determination - phasor diagram and regulation of salient pole alternators - Expression for power developed as a function of torque angle - Parallel operation of alternators.

2. SYNCHRONOUS MOTORS


Synchronous motors: Synchronous machines on infinite bus bars - phasor diagram - V and inverted V curves - current and power circle diagrams - Hunting and its suppression - starting methods - synchronous condenser - reluctance motor.

3. POLYPHASE INDUCTION MOTORS


Poly phase Induction motors - types and constructional features - principle of operation - phasor diagram - equivalent circuit - slip torque characteristics - effect of rotor resistance - circle diagram - starting and speed control.

4. INDUCTION MACHINES FOR SPECIAL PURPOSES

High torque induction motors - Induction generators - Grid connected - Capacitor excited - Synchronous Induction Motor - Permanent Magnet Generators.

5. SINGLE PHASE AND LINEAR INDUCTION MOTORS

Single phase induction motors - types and constructional features - Principle of operation - equivalent circuit based on double revolving field theory - Universal motors - design features. Linear induction motors.