ASYNCHRONOUS MOTOR STARTING CONTROL DEVICE Russian patent published in 2020 - IPC H02P1/26 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and is intended for use in industrial drives with squirrel-cage induction motors. Control device is realized using the principle of subordinate adjustment of coordinates. Main feedback is closed by voltage on stator winding of asynchronous motor (12) by means of serially connected voltage sensor (13) and measuring transducer of active value of voltage (14). Setting of voltage on stator winding of asynchronous motor is performed by means of setter (14). Voltage regulator (10) performs the mismatch signal conversion in accordance with the standard regulation law, for example proportional or proportional integral. Output signal of voltage regulator (10) acts at input of current limiting unit (9), which provides limiting the setting signal for current controller (6) corresponding to the current of the power supply allowed during the specified time interval. Subordinate current control loop is arranged with the help of current sensor (7), root-mean-square current converter (8) and current controller (6) implementing the standard control law. Asynchronous motor (12) active power control circuit is arranged by means of active power transducer (4) and active power controller (1) implementing the standard control law. Output signal of active power controller (1) operates at input of pulse-phase control unit (2), which generates pulses for thyristor regulator (5). As a result of three feedbacks, the actual voltage value at the output of thyristor regulator (5) during start-up is always maintained so that the current does not exceed the level set by the current limiting unit (9), and the active power does not exceed the value set by the active power limitation unit (3). Thus, during start-up of the asynchronous motor, active power consumed from the power supply does not exceed the specified value.

EFFECT: technical result consists in improvement of efficiency of power supply source energy source usage.

1 cl, 2 dwg