Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
Operation of an Alternator
Synchronous Machines
The rotor winding is energised from the DC exciter and alternate N and S poles developed on the rotor.
OPERATION
OF AN ALTERNATOR
The rotor winding is
energised from the DC exciter and alternate N and S poles developed on the
rotor. When the rotor is rotated in anticlockwise direction by a prime mover
the stator or armature conductors are cut by the magnetic flux of rotor poles.
Consequently, emf is induced in the armature conductors due to electromagnetic
induction. The induced emf is alternating since N and S pole of rotor
alternately pass the armature conductors. The direction of induced emf can be
found by Fleming's right hand rule and frequency is given by
f = NP / 120
Where,
N = speed of rotor in
rpm
P = number of rotor
poles
Fig. 4.3 shows star‒connected
armature winding and DC field winding. When the rotor is rotated, a 3‒phase
voltage is induced in the armature winding. The magnitude of the induced emf
depends upon the speed of rotation and DC excitation current.
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines : Tag: Basic Engineering : Synchronous Machines - Operation of an Alternator
Basic Electronics and Electrical Engineering: Chapter 4: Synchronous Machines
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