| 摘要 |
The invention relates to a method for actuating a multiphase frequency converter for actuating an electric machine 8, said electric machine 8 being suitable as a traction drive of a vehicle. The frequency converter comprises power switch pairs, each of which comprises a first power switch 4 and a second power switch 7 that are connected in series. The first power switch 4 is connected to a DC voltage UBAT, and the second power switch 7 is connected to a reference potential GND of the DC voltage UBAT, each node between the first power switch 4 and the second power switch 7 being connected to the respective phase conductor of the electric machine 8. The method has the following steps: ascertaining the presence of a fault 17; and in the event of a fault and an inactive control signal at the first and/or second power switch, determining whether the frequency converter should be switched into the short-circuit mode or the freewheeling mode using the phase conductor currents iU, iV, iW and/or using the position of the rotor of the electric machine 8. |
