In changing the excitation current of the generator, it is generally not carried out directly in its rotor loop because the current in the loop is large and it is not easy to directly adjust. The usual method used is to change the excitation current of the excitation generator. In order to adjust the rotor current of the generator. Commonly used methods include changing the resistance of the excitation circuit of the exciter, changing the additional excitation current of the exciter, and changing the conduction angle of Silicon controllable.
In recent years, with the rapid development of power electronics technology, Microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors have been rapidly promoted and applied. Compared with traditional electric excitation synchronous Motors, permanent magnet synchronous Motors, especially rare earth permanent magnet synchronous Motors, have the advantages of low loss, high efficiency and obvious power saving effect.
