Patent ID: 11923798
Assignee: SEW-EURODRIVE GMBH & CO. KG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A drive system, comprising:
an electric motor;
an inverter having an AC-voltage-side terminal adapted to feed the electric motor;
a first series circuit, including a brake resistor and a first controllable semiconductor switch, connected at a DC-voltage-side terminal of the inverter; and
a second series circuit, including an impedance and a controllable second semiconductor switch, connected and/or switched in parallel with the first series circuit;
wherein the drive system is operated by a method that includes:
connecting the first series circuit, which includes the brake resistor and the first controllable semiconductor switch, at the DC-voltage-side terminal of the inverter of the drive system;
connecting the second series circuit, which includes the impedance and the controllable second semiconductor switch, in parallel with the first series circuit;
acquiring a voltage applied at the DC-voltage-side terminal of the inverter; and
generating an actuation signal for the first semiconductor switch and an actuation signal for the second semiconductor switch to close the first semiconductor switch when the voltage exceeds a first threshold value, to open the first semiconductor switch when the voltage exceeds a third threshold value, and to close the second semiconductor switch when the voltage exceeds a fourth threshold value.