DEVICE FOR STABILIZATION OF ELECTRIC MOTOR ROTATIONAL SPEED Russian patent published in 1998 - IPC

FIELD: collector electric motors, in particular, for hand electric tools. SUBSTANCE: device has triac which is connected in series to electric motor in alternating current circuit. Control electrode of triac is connected through threshold gate to control circuit which has amplification unit. Amplification unit provides possibility of smooth regulation of output current depending of load current by means of introduced unit providing smooth start and manual control. Smooth acceleration of electric motor eliminates overload of circuit elements, possibility of tool failure in beginning of device operations. EFFECT: increased functional capabilities, facilitated use. 7 cl, 2 dwg