DIRECT CURRENT ELECTRIC DRIVE Russian patent published in 1997 - IPC

FIELD: electric engineering. SUBSTANCE: device regulates rotation frequency of direct current electric motor which is supplied by alternating current power supply. Device may be used in home appliances which require smooth regulation of rotation frequency in wide range under condition that radio interference is minimal. Corresponding device has direct current electric motor, power gate, rectifying bridge, rotation frequency setter, voltage stabilizer. In addition diode, resistor, comparator and voltage scaling circuit are introduced to accomplish the goal of invention. Power gate is designed using field-effect transistor. EFFECT: increased dynamic range of electric motor rotation frequency regulation, low radio interference level, linear regulation. 2 dwg