FIELD: electricity.
SUBSTANCE: energy-saving system for control of asynchronous drive contains a block for input of preset rotary speed of asynchronous motor, voltage regulator, block of drivers, autonomous voltage inverter, calculator of stator current vector projections, calculator of stator active current, multipliers, matching amplifier, filter, integrator, calculators of sine and cosine angle of voltage vector turn, block for switching of drive operation modes, block of pulse-length modulation and current sensor interconnected in the way specified in the application. At that signal outputs of current sensors are connected to outputs of calculator of stator current vector projections which is by its outputs is connected to the first and third input of calculator of stator active current, while the second and fourth outputs of calculator of stator active current are connected to outputs of multipliers.
EFFECT: reducing energy consumption of variable-frequency asynchronous drive with reduction of motor loads below the rated values.
2 dwg
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