Talking about repairing the motor

There are many kinds of generators. Generally, generators with tens of kilowatts have many uses. I'll just say it briefly. When the armature of the generator rotates, it induces a voltage together with the stator coil (specially designed for the excitation coil). This voltage is generated by the remanence of the iron core, and then it is rectified by the bridge silicon into direct current, which is excited by the brush power supply pivot. The required power is generated after excitation, and the voltage is controlled by the speed of external power supply. I am repairing the motor. I hope my answer is helpful to you. By the way, ordinary three-phase motors can be changed into generators. The method is to connect capacitors in parallel between lines.