"Overcurrent Limit In The Control Of Three Phase Machines Fed By Inverter"

Abstract: The invention relates to a method and a structure for the operation of a rotary current machine, which is fed by a three-phase converter, using a stator flux controller (123) and a slip frequency controller (113) or using a stator flux controller and a torque controller, wherein • the torque-forming fundamental-frequency current component of the stator current, i.e. the current through the stator of the machine (N), is limited by limiting a setpoint value (ω*Sl) that is supplied to the slip frequency controller (113) or to the torque controller to a maximum slip frequency value (ω*Sl_i_max, at the output of 112) or maximum torque value, • the flux-forming fundamental-frequency current component of the stator current is limited by limiting the speed at which a setpoint value (ψ* s) supplied to the stator flux controller (123) changes to a maximum value (ΔψS,max, at the output of 119), • the maximum slip frequency value (ω*Sl_i_max) or maximum torque value is calculated on the basis of a prescribed maximum current value (is,max) for a stator current fundamental-frequency magnitude of the stator current and on the basis of a filtered actual value (| iSd |f) of the flux-forming fundamental-frequency current component (iSd) of the stator current (is).

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