"Inflatable Air Blower" motor speed control system of the whole is an important aspect, the use of a DC motor so that the output voltage is changed, so that the change is applied to happen "Inflatable Air Blower" input voltage to adjust the fan speed, realization of the wind speed stepless gear. Features DC motors: motor voltage waveform is better, less affected by electromagnetic interference. "Inflatable Air Blower" a wide range of DC motor speed, speed characteristic smooth. Relatively strong DC motor overload, starting and braking torque is relatively large. Easy to control, and high reliability.