FIELD: motor control using DC servo drives. SUBSTANCE: servo drive that has clock frequency generator 1, motor starting device 2, phase-frequency comparator 4, logic circuit 6 for controlling winding switches, two winding switches 7 and 8, two internal-voltage detectors 9 and 10, motor 11 with rotor and two stator windings 12 and 13 is provided in addition with newly introduced pulse-width modulator 5 with the result that current coming from power supply is consumed only during part of period and current pulse width depends on motor shaft load and supply voltage of winding switches. EFFECT: enhanced efficiency due to pulse-width modulation; simplified design. 6 cl, 7 dwg
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