Synchronous generator In order to achieve energy conversion, there needs to be a DC magnetic field the DC current generated by this magnetic field is called the generator excitation current. According to the supply mode of excitation current, all generators that obtain excitation current other power sources are called separate excited generators, those that obtain excitation power the generator itself are called self-excited generators.

Advantages: permanent magnet synchronous motor has the advantages of simple structure, small size, light weight, low loss, high efficiency, high power factor, mainly used for high performance servo transmission system DC motor replacement motor requiring fast response, wide speed regulation range accurate positioning.

Disadvantages: maximum torque is constrained by permanent magnet demagnetization, poor seismic ability, high speed is limited, small power, complex motor structure, high cost starting difficulty.