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Separators Purifiers : Power generation On board Main Engine

MAIN ENGINE Main Generator

POWER GENERATION ON BOARD

Shipboard power is generated using a prime mover and an alternator working together. For this an alternating current generator is used on board. The generator works on the principle that when a magnetic field around a conductor varies, a current is induced in the conductor.

The generator consists of a stationary set of conductors wound in coils on an iron core. This is known as the stator. A rotating magnet called the rotor turns inside this stator producing magnetic field. This field cuts across the conductor, generating an induced EMF or electro-magnetic force as the mechanical input causes the rotor to turn.

The magnetic field is generated by induction (in a brushless alternator) and by a rotor winding energized by DC current through slip rings and brushes. Few points to be noted about power on board are :

AC, 3 phase power is preferred over DC as it gives more power for the  same size.

3 phases is preferred over single phase as it draws more power and in the event of failure of one phase, other 2 can still work.

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