3 Basic concepts of Rotating Machines
Transformers have already been introduced. The transformer is a static device having primary and secondary windings. In rotating machines, there are two parts: the stator and the rotor. Rotating electrical machines are also of two types: DC and AC machines. Electrical machines are widely used. In DC machines the stator is used as a field and the rotor is used as an armature, while reverse is the case for AC machines, that is, synchronous generators and synchronous motors. The induction motor is another kind of AC machine, which is singly excited; that is, AC supply voltage is only given to the stator and no supply is given to the rotor. In DC machines and synchronous machines, the field is always excited ...
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