LIMITATION OF OVERLOAD CURRENT AT REGULATION OF INVERTER-POWERED THREE-PHASE MOTORS Russian patent published in 2015 - IPC H02P21/08 H02P21/00 H02P27/06 

FIELD: electricity.

SUBSTANCE: invention relates to electrical equipment and can be used for control and/or regulation at operation of three-phase motors. The three-phase motor is powered from 3-phase current rectifier using the stator current controller (123) and the slip frequency regulator (113) or using the stator current controller and torque controller. For limitation of the torque forming component of the current of the base oscillation of the stator current, that is the current through the motor stator (N), the slip frequency brought to the regulator (113) or the torque regulator the pre-set value (ω*_Sl) is limited to the maximum value (ω*_{Sl_i_max}) of slip frequency or the maximum torque value; for limitation of the component of current of the base oscillation of the stator current forming a flow limit the speed with which the set size (ψ*_S) brought to the regulator (123) of the stator flow, up to the maximum value changes (Δψ_S,max, from 119 in output). The maximum value (ω*_{Sl_i_max}) of the slip frequency or the maximum torque value are calculated depending on the pre-set maximum value (i_S,max) of current for the value of the base oscillation of the stator current and depending on the filtered actual value (|i_Sd|_f) of the flow forming component (i_Sd) of current of the base oscillation of the stator current (i_S).

EFFECT: improvement of efficiency and reliability of limitation of the stator current at high dynamics at motor operation.

10 cl, 6 dwg