DIRECT-CURRENT DRIVE Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: electric drive has housing, electric motor connected to first lead and through pulse amplifier to second lead of power supply, comparator whose first input is connected to first lead of rated voltage source and its output is connected to pulse amplifier input, first and second resistors whose first leads are interconnected and connected to first capacitor lead, first voltage divider whose first lead is connected to second lead of power supply, second lead is connected to electric motor and to second lead of capacitor; center tap is connected to second lead of first resistor; it also has second voltage divider whose first lead is connected to second lead of first voltage divider. Novelty is that second lead of second resistor is connected to pulse amplifier output, second lead of rated voltage source is connected to center tap of first voltage divider, second lead of second voltage divider is connected to second lead of power supply and its center tap is connected to second input of comparator; first and second voltage dividers form bridge circuit. Provision is made for manufacturing drive housing in the form of pedal whose moving part mounts winding incorporated in rated voltage source. Interference filter is inserted between power supply and bridge circuit. EFFECT: improved reliability of dc motor speed control. 3 cl, 2 dwg