Marine Engineering

The working principle of an alternator is very simple. it's just like a basic principle of DC generator. It also depends upon Faraday's laws of electromagnetic induction which says the current is induced in the conductor inside a magnetic field when there is a relative motion between that conductor and the magnetic field in other words when the conductor cuts magnetic field the emf will be induced. In a loop of conductor, is rotated in a magnetic field of opposite polarity, the EMF can be measured by a slip rings. Here we need a slip ring and a carbon brush assembly to pick up the power of the rotating parts and hence it needs contact maintenance and the voltage cannot be controlled. we can avoid slip ring by keeping the conductor stationary and rotating the magnet and get the same effect with slip ring assembly. The brushless self-excited alternator is an advanced version of alternator, where the voltage can be controlled by adjusting the field current in the excited s...