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Page |1 Dc machine lecture#34 Generator: it is a machine which converts mechanical energy into electrical energy is called generator. Classification of dc generator: Dc generator Separately excited dc generator: A dc generator whose field magnet winding is supplied from and independent external source (e.g. a battery etc) is called a separately excited dc generator .fig shows the connection of a separately excited generator .the voltage output depend upon the speed of rotation of armature and the field current ( Eg P N 60a ).The greater the speed and field current, greater is the generated emf. It may be noted that separately y excited dc generator are rarely used in practice .The dc generator are normally of self-excited type. Page |2 Dc machine lecture#34 Self-excited dc generator: Self-excited dc generator whose field magnet is supplied current from the output of dc generator itself is called a self-excited dc generator .There are three types of self excited dc generators depending upon the manner in which the field winding is connected to the armature, namely; i. Series generator; ii. Shunt generator; iii. Compound generator