Method and device for controlling a multimotordrive having asynchronous motors and an inverter with voltage intermediate circuit

摘要

The method involves using a two-component current control technique to determine a flow and a torque for generating a desired current component and parameters of a supply voltage vector for the inverter (4). This is dependent on two measured inverter output currents. A measured revolution rate and corrected slip frequency demand value are added to a supply frequency. A maximum slip frequency difference value is derived from actual slip frequencies. A correction frequency is limited to a maximum value as soon as the maximum slip frequency difference exceeds a limit. The inverter drive signal (S1-S6) is derived from the vector and the supply frequency.