How does a generator generate electricity?

British physicist Faraday from 1822, after ten years of hard work, finally discovered in 1831 that magnetism can also generate electricity. The basic principle of generator power generation is based on the physical phenomenon that a coil rotates in a magnetic field to cut magnetic lines of force. Under the action of electromagnetic force, the coil will generate an induced current (electrical energy), while the generator is more complex.

 

We all know a physical phenomenon: the coil rotates in the magnetic field and does the movement of cutting the magnetic field lines. Under the action of electromagnetic force, an induced current will be generated in the coil, which is to generate electricity. The generator is designed and manufactured according to this principle, but it is more complicated, but the basic principle is the same.

 

The rotor of the generator is a magnetic pole, and the rotor is equipped with an excitation winding. When the DC power is applied, it will be excited to generate a magnetic field. In layman's terms, it will become an electromagnet. Generally, the equipment that supplies DC power to the rotor is called an exciter, which is connected The one at the back of the generator, its function is to emit direct current during operation and supply it to the rotor excitation coil to generate a magnetic field. This method of supplying direct current is called separate excitation in the electrical profession, and there is also a self-excitation method, which is Do not use the exciter, but use the alternating current generated by the generator, which is converted into direct current after the excitation is changed (silicon rectification), and is supplied to the rotor coil.