FIELD: electrical engineering; speed control for dc motors supplied with power from ac mains. SUBSTANCE: dc drive has dc commutator motor shorted out by diode and connected through first isolating diode and power switch across diagonally opposite terminals of rectifier bridge in parallel with first voltage divider and voltage regulator; three comparators; storage-retrieval circuit; active low-frequency filter; OR and EXCLUSIVE OR gates; governor; speed setting element; and differential amplifier; in addition it is provided with fourth and fifth comparators, NOR gate, second active low-frequency filter, additional switch, and second isolating diode. EFFECT: improved starting characteristics of drive. 1 cl, 2 dwg
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