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April 12, 2022
Electric energy is one of the most important energy sources in modern society. A generator is a mechanical device that converts other forms of energy into electrical energy. It is driven by a water turbine, a steam turbine, a diesel engine or other power machinery, and converts the energy generated by water flow, airflow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator. Converted to electricity by a generator. Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life. The following editor will introduce to you "the role of the alternator rotor, the role of the alternator stator, and the principle of the alternator"
1. The role of the alternator rotor
There is an excitation winding on the rotor. When the excitation current is introduced, an alternating magnetic field will be generated due to the rotation of the rotor under the action of the motive force. The three-phase windings of the stator cut the magnetic lines of force in sequence. of the alternating electromotive force.
The function is to provide a magnetic field. The function of the rectifier is to convert the alternating current into direct current and give the rotor a constant magnetic field.
2. The role of alternator stator
The function of the stator is to generate alternating current, which is used to generate the excitation magnetic field. The rotation mode of the inner rotor is that the core in the middle of the motor is a rotating body. There is an armature winding in the rotor slot. When the armature winding is energized, the stator is used when the armature winding is energized to generate the excitation magnetic field.
3. Principle of alternator
Using the principle of electromagnetic induction in which the electric potential is induced by wire cutting magnetic lines of force, the mechanical energy of the prime mover is converted into electrical energy output. A synchronous generator consists of a stator and a rotor. The stator is the armature that generates electricity, and the rotor is the magnetic pole. The stator consists of armature iron core, three-phase windings evenly distributed, frame and end cover. The rotor is usually a hidden pole type, consisting of an excitation winding, an iron core and a shaft, a guard ring, and a center ring. The excitation winding of the rotor is fed with a DC current to generate a nearly sinusoidal distributed magnetic field (called the rotor magnetic field), and its effective excitation magnetic flux is interlinked with the stationary armature winding. When the rotor rotates, the magnetic field of the rotor rotates along with it, and the magnetic field line cuts each phase winding of the stator sequentially, and a three-phase AC potential is induced in the three-phase stator winding. When the generator runs with a symmetrical load, the three-phase armature currents combine to generate a rotating magnetic field with a synchronous speed. The interaction between the stator magnetic field and the rotor magnetic field produces braking torque. From the steam/water/gas turbine, the input mechanical torque overcomes the braking torque to do work.