D C ELECTRIC MOTOR DRIVE Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: D.C. electric motor drive includes frame, electric motor connected to leads-out of power supply source via pulse amplifier which input is linked to output of comparator, first and second resistors which first leads-out are interconnected and linked to first input of comparator, second lead-out of first resistor is coupled to first leads-out of third resistor, fourth and fifth resistors which first leads-out are tied together. Second lead-out of fourth resistor is linked to minus of power supply source and second lead-out of fifth resistor is connected to electric motor. Novelty of drive lies in insertion of sixth resistor and of controlled source of reference voltage. One input of it is linked to plus of power supply source, its second input is coupled to common point of connection of fourth and fifth resistors and controlled output is connected to second input of comparator. First output of sixth resistor is linked to first input of comparator, its second output is coupled to second output of capacitor and to plus of power supply source. Second lead-out of third resistor is connected to output of pulse amplifier and second lead-out of second resistor is linked to minus of power supply source. In this case second, fourth, sixth resistors and controlled source of reference voltage form bridge circuit. Apart from them frame has mobile part mechanically coupled to output of controlled source of reference voltage. Radio noise filter may be placed between power supply source and bridge circuit. EFFECT: simplified design of electric drive, improved mass and size indices and enhanced stability of rotational speed of motor with change of voltage of power supply source. 3 cl, 2 dwg