UNIT II: INDUCTION MOTORS (ASYNCHRONOUS) |
II-1 Three-phase induction machine
Construction characteristics. Operating principles. Electrical equivalent circuit. Powers and torques. Electrical tests. Energy balance and efficiency. T-s curve. Operation modes. Starting methods and speed control.
II-2 Single-phase induction motor
Construction characteristics. Operating principles. Electrical equivalent circuit. Starting methods.
UNIT III: SYNCHRONOUS MACHINES (GENERATORS)
Construction characteristics. Operating principles. Armature reaction. Salient poles and cylindrical rotor machines. Electrical equivalent circuit. Stand-alone and grid-connected behaviours. Synchronous motor: Characteristics and uses
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UNIT IV: D.C. MOTORS. SPECIAL MACHINES |
IV-1 Construction characteristics. Operating principles. Excitation systems. Armature reaction. Commutation. Armature reaction. Speed control.
IV-2 Special machines: Step Motors, PMDC, Reluctance Motors
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