Abstract: A sewing machine includes as a driving element the low-inertia electric motor which is controlled by an electronic controller which receives signals from a digital/analog converter controlled by a microprogrammed controller. The low-inertia motor includes an electronic tachometer electrically connected to a speed controller which is comprised of an adjusting and control stage and a power distribution stage. The adjusting and control stage receives signals from a tachometric feed-back circuit as well as signals from a feed-back circuit of the intensity consumed by the low-inertia motor and also a reference signal from the digital analog controller. The adjusting and control stage supplies a signal of the state of motion for the coupling interphase with the controller and signals of speed control and operating speed control of the low-inertia motor.