5EX2-ELECTRICAL MACHINES-II |
Units: I-Introduction: |
General equation of inducted emf, AC armature windings:
concentric and distributed winding, chording, skewing, effect on induced emf. Armature
and field mmf, effect of power factor and current on armature mmf, harmonics. Rotating
fields.
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Units: II-Induction Motors: |
Construction of squirrel cage & slip ring induction motor, basic
principles, flux and mmf waves, induction motor as a transformer. Equivalent circuits, torque
equation, torque-slip curves, no load & block rotor tests, circle diagram, performance
calculation. Effect of rotor resistance. Cogging, Crawling. Double cage squirrel cage
induction motor, induction generator, induction regulator. |
Units: III-Starting & Speed Control of Induction Motors: |
Various methods of starting &
speed control of squirrel cage & slip ring motor, cascade connection, braking.
Single-Phase Induction Motor: Revolving field theory, starting methods, equivalent
circuits.
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Units: IV-Synchronous Generator: |
Construction, types, excitation systems, principles.
Equation of induced emf, flux and emf waves, theory of cylindrical rotor and salient pole
machines, tworeactance theory, phasor diagrams, power developed, voltage regulation,
OC & SC tests, zero power factor characteristics, potier triangle and ASA method of
finding voltage regulation, synchronization, parallel operation, hunting and its
prevention.
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Units: V-Synchronous Motors: |
types, construction, principle, phasor diagrams, speed
torque characteristics, power factor control, V-curves, starting methods, performance
calculations, applications, synchronous condenser, synchronous induction motor.
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