What is the function of the compressor’s excitation motor and how does it work?

The main functions of the excitation system are: 1) Adjusting the excitation current accordingly to changes in the generator load, in order to maintain the terminal voltage at a specified value； 2) Control the distribution of reactive power among generators operating in parallel ； 3) Improve the static stability of generator parallel operation ； 4) Improve the transient stability of parallel operation of generators ； 5) When a fault occurs inside the generator, de-excitation is carried out to reduce the extent of the damage caused by the fault ； 6) Impose maximum and minimum excitation limits on the generator according to operational requirements. The principle of a generator is the phenomenon of cutting magnetic field lines, while an exciter is a system that controls the strength of the magnetic field. An exciter is a low-power generator that operates synchronously on the same axis as the main generator, and its output of electrical energy is used specifically to excite the rotor of the main generator.