DIRECT-CURRENT DRIVE Russian patent published in 2000 - IPC

FIELD: DC motor speed control and adjustment. SUBSTANCE: electric drive has DC commutator motor, rectifier bridge, diodes, low-frequency active filter, voltage regulator, speed setting element, voltage divider, comparator, and power switch. In addition, it has differential amplifier, second and third comparators, one more voltage divider, storage-retrieval unit, controller, OR and EXCLUSIVE OR gates. EFFECT: improved stability and precision of speed control in wide range of loads on motor shaft. 2 dwg