The DC governor is a device for regulating the speed of the DC motor, divided into the motor DC governor, the pulse width DC governor, the thyristor DC governor, etc. The DC motor governor is a modular device consisting of the power supply, control circuit and drive circuit. The control circuit uses low power electronic components and uses optocouplers to isolate current and voltage. The proportional constant, integral constant and differential constant of the circuit can be adjusted by the PID adapter. The DC governor has the characteristics of small size, light weight, etc. It can be used alone or directly installed on the DC motor to form an integrated DC speed regulating motor.