DEVICE AND METHOD FOR OPERATING AN ELECTRIC MACHINE

摘要

The present invention provides a device and a method for changing over an electric machine from the regular operating mode into the open-circuit mode. In order to avoid excessive increases in voltage and associated adverse effects on the electric machine and the other components, in particular batteries, a further control phase is introduced between the end of the regular operating mode and the freewheeling mode, during which further control phase the voltage at the terminals of the electric machine is continuously adjusted from the voltage previously set in the regular operating mode to the expected open-circuit voltage of the electric machine.

主权项

1. A device for operating an electric machine (2), including an inverter (1) which is designed to provide an AC voltage at the terminals of the electric machine (2) in a regulated operating mode, to electrically disconnect the terminals of the electric machine from each other in a freewheeling mode (2),
wherein the inverter (1) is designed to set the amplitude of the AC voltage provided at the terminals of the electric machine (2) to a predetermined value during a transition from the regulated operating mode to the freewheeling mode.