DC GENERATOR-Principle of operation D.C generator is a machine that converts mechanical energy into DC electrical energy. Generator is based on the principle that whenever a magnetic flux is cut by a moving conductor a dynamic emf is induced in the conductor, as per Faraday’s laws of electromagnetic induction. The emf so induced is an alternating emf. It is made unidirectional with the help of commutator and brushes. This emf causes flow of current in the external circuit if the circuit is closed. The direction of this induced emf is given by Fleming’s right hand rule. According to this rule, if the middle finger, forefinger and thumb of right hand are at right angle to each other and if the forefinger represent the direction of magnetic field and the direction of motion respectively, then the middle finger will indicate the direction of the induced emf.
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