Generators in power systems are almost synchronous
generators with few exceptions, for examples, induction
generators. The principle of generators is based on the
Fleming’s right hand law: e ¼ lv B, where e: electric
motive force, l: length of conductor, v: speed of conductor
and B: magnetic induction. Then generators
consist of field windings for generating magnetic induction
and armature windings for obtaining electric
power. For transforming rotating torque into electric
power, they almost consist of cylindrical rotor with field