FIELD: single-phase and three-phase alternating current electric drives which operate in start-stop mode. SUBSTANCE: method involves variation of duration r for connection of electric motor 2 to power supply 1 during connection time T. Simultaneously with variation of duration r for connection of electric motor 2 to power supply 1 connection time T is also controlled. Maximal value of connection time T is not greater than four values of electromagnetic time constant for electric motor 2. Electric motor 2 is connected by means of semiconductor commutator 3 which is controlled by channel and by T from oscillator 4. EFFECT: increased dynamic range of speed control for low speed variation. 4 dwg
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