That is, the magnetic poles of the rotor are highlighted. (As shown below left)
A generator is a mechanical device that converts other forms of energy into electrical energy. Generators are generally composed of stators, rotors, end covers, bearings and other components. The rotor is composed of rotor core winding (or magnetic pole, magnetic choke), retaining ring, center ring, slip ring, fan and a rotating shaft.
The shape of generator rotor is divided into hidden pole type and explicit pole type. Hidden pole type: the rotor is cylindrical, thin and long, there are no protruding magnetic poles on the rotor, the speed is high, and the number of magnetic pole pairs is small. It is generally used in steam turbine generators; The type is also called salient pole type: the rotor ist big. Most of them are shaped like a round cake, with pairs of magnetic poles and excitation coils visibly protruding from the rotor. They have a low rotational speed and many pairs of magnetic poles. used in hydroelectric generators.