Classification of rotating magnetic pole type (most synchronous generators): The magnetic pole is on the rotor, and the armature winding is on the stator. The rotor is further divided into: load operating characteristics load operating characteristics 1. hidden pole: high-speed motor (steam turbine), distributed winding; 2. Salient pole: low-speed motor (water turbine), concentrated winding. Rotating armature type (small capacity or special purpose, such as synchronous motor AC exciter): The magnetic pole is on the stator, and the armature winding is on the rotor. When the generator is not connected to a load and the armature current is zero, it is called no-load operation. At this point, the three-phase winding of the motor stator only has the no-load electromotive force (three-phase symmetry) induced by the excitation current, and its size increases with increasing. However, due to the saturation phenomenon of the magnetic circuit core of the motor, the two are not proportional. The curve that reflects the relationship between no-load electromotive force and excitation current is called the no-load characteristic of a synchronous generator
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