Power converter for rotating electrical machines

It is a power converter for rotary electric machines is provided, which is designed to ensure a desired length of a current-free-run time is in allowing a flow of the rotary electric machine is running free, even if the power converter in a transient state or is subjected to a sudden change. The power converter is configured with a control device and which is arranged between a power supply and windings of the electric rotating machine of a switching circuit. The switch circuit includes switches grouped into an upper and a lower arm. The control device serves to control a switching-off of one of the switches of one of the upper and lower arms such that a desired length of the current free-wheeling time is produced that follows the one of the switches to turn off, whereby a loss in the minimized rectification and the return flow of a current is prevented from the power supply to the windings.