Method for reduction of a current breakdown in a non-commuting phase belt of a three-phase block current supplied synchronous machine and circuit arrangement therefor

摘要

The invention relates to a method for reduction of a current breakdown in a non-commutating phase belt (R) of a three-phase block current supplied synchronous machine (2), while the phase currents (iS, iT) of the two other phases (S, T) commutate. According to the invention, a triangular, high-frequency sampling voltage (UD) of a pulse frequency generator (12) of a control set (10) of a power converter (8) feeding the synchronous machine (2) is short-circuited in each case at the commencement of commutation for a predetermined synchronising period (T). In this way a method and a circuit arrangement for carrying out the method is obtained with which the torque ripple of a three-phase feed drive is reduced. …IMAGE…