3EE4-ELECTRICAL MACHINES-I |
Units: I-Electromechanical Energy Conversion: |
Basic principles of electromechanical energy
conversion. Basic aspects and physical phenomena involved in energy conversion. Energy
balance.
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Units: II-DC generators: |
Construction, Types of DC generators, emf equation, lap & wave windings,
equalizing connections, armature reaction, commutation, methods of improving commutations,
demagnetizing and cross magnetizing mmf, interpoles, characteristics, parallel operation.
Rosenberg generator. |
Units: III-DC Motors: |
Principle, back emf, types, production of torque, armature reaction & interpoles,
characteristics of shunt, series & compound motor, DC motor starting. Speed Control of DC
Motor: Armature voltage and field current control methods, Ward Leonard method. Braking,
losses and efficiency, direct & indirect test, Swinburne’s test, Hopkinsion test, field &
retardation test, single-phase series motor.
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Units: IV-Transformers: |
Construction, types, emf equation. No load and load conditions. Equivalent
circuits, Vector diagrams, OC and SC tests, Sumpner’s back-to-back test, efficiency. voltage
regulation, effect of frequency, parallel operation, autotransformers, switching currents in
transformers, separation of losses.
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Units: V-Polyphase Transformers: |
Single unit or bank of single-phase units, polyphase connections,
Open delta and V connections, Phase conversion: 3 to 6 phase and 3 to 2 phase conversions,
Effect of 3-phase winding connections on harmonics, 3-phase winding transformers, tertiary
winding.
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