The structure of the single-phase series motor is very similar to that of the DC series motor. The main difference is that the stator core of the single-phase series motor must be laminated with silicon steel sheets, while the DC magnetic poles can be laminated or laminated. make a whole structure. The speed regulation of the single-phase series motor, most of which use the method of regulating the voltage, is to change the electromotive force. The controllable phase-shift voltage regulation adopted by the voltage speed regulation method of the single-phase series excitation motor utilizes the trigger voltage of the thyristor to lag behind the input voltage to realize the phase-shift trigger of the input voltage. There are hardware and software methods in terms of implementation methods.