Where are the stator and rotor of the hydrogenerator?

The stator and rotor are the main components of a hydrogenerator and are key elements in converting mechanical energy into electrical energy. The stator is fixed and contains an iron core and a stator coil. The rotor is fitted onto the main shaft of the generator and the rotor is equipped with an excitation coil. Once installed, it is inserted into the stator and there is a certain space between the stator and the rotor, called an air gap. The main shaft of the hydrogenerator is connected to the main shaft of the hydroturbine. The hydroturbine drives the rotation of the generator rotor. After the excitation current passes through the rotor coil, a magnetic field is generated. which cuts the stator coil and generates electrical energy. You can find some books to read, the basic structure is still not simple.