publication_number US 2004021376 A1 abstract the converter comprises a plurality of bridge circuits connected to phase windings of a machine of which each circuit has a plurality of electrically controllable switches and one buffer memory embodied as a capacitor a version of the converter that is simple from a production standpoint and is highly economical in terms of space is obtained by providing that the capacitor is embodied as a foil capacitor surrounding the machine to the electrodes of which the bridge circuits are connected distributed over the circumference of the machine application_number US 33308603 A description in fig1 the circuit diagram is shown for a converter that is designed for multi phase operation of an electric machine that is otherwise designed for three phase operation this converter comprises n bridge circuits 1 2 3 n the number n of bridge circuits depends on the number k of chronologically staggered pulses with which the phase windings of the electric machine are to be triggered for an intrinsically three phase machine the number n of bridge circuits required is then n 3 k each of the bridge circuits 1 2 3 n comprises the series circuit of two electrically controllable switches the bridge circuit 1 has the switches 11 12 the bridge circuit 2 has the switches 21 22 the bridge circuit 3 has the switches 31 32 and the bridge circuit n has the switches n 1 n 2 a phase winding of the electric machine is connected to a tap between the two switches of each bridge circuit thus the phase winding 4 is connected to the bridge circuit 1 the phase winding 5 is connected to the.