4EE3-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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