Method and apparatus for dealing with faults in an electrical drive system

摘要

A method for dealing with faults in an electrical drive system having an electrical machine and a pulse-controlled inverter which has a first and a second supply connection, the method including the steps of: detecting a first fault in the electrical drive system; selecting a first of a large number of circuit states (22, 23, 24) of the pulse-controlled inverter according to the detected first fault; and driving the pulse-controlled inverter to set the first circuit state (23), with the circuit states (22, 23, 24) including a short circuit (23) between the power connections of the electrical machine and the first supply connection, a short circuit (24) between the power connections of the electrical machine and the second power connection, and a free-running mode (22).

主权项

1. A method for dealing with faults in an electrical drive system (30) having an electrical machine (11) and a pulse-controlled inverter (5) which has a first and a second supply connection (5a, 5b), said method comprising the steps of:
detecting a first fault in the electrical drive system (30); driving, based on the first fault, the pulse-controlled inverter (5) to set a circuit state, wherein the circuit state is a free-running mode (22); if the detected first fault is still present in the electrical drive system (30) after a predetermined amount of time, driving the pulse-controlled inverter (5) to set a first short circuit state, selected based on the type of detected first fault, with the short circuit states (23, 24) comprising
a short circuit (23) between the power connections (10a, 10b, 10c) of the electrical machine (11) and the first supply connection (5b), anda short circuit (24) between the power connections (10a, 10b, 10c) of the electrical machine (11) and the second supply connection (5a); detecting a second fault in the electrical drive system (30), this second fault occurring in addition to the first fault; selecting a second short circuit state of the short circuit states (23, 24) of the pulse-controlled inverter (5) according to the detected second fault; and driving the pulse-controlled inverter (5) to change from the first short circuit state to the second short circuit state.