FIELD: electrical engineering, DC electric machines with commutating poles and compensation winding. SUBSTANCE: former of commutation field of D. C. electric machine is fitted with synchronization unit and lead computing unit which inputs are connected to outputs of transducers of rotational speed of armature, armature current and excitation current of main poles as well as to outputs of synchronization unit which input is connected to output of transducer of presence of excitation current of main poles. Outputs of lead computing unit are coupled to signal inputs of amplifiers feeding excitation windings of commutating poles. EFFECT: improved commutation under any operational mode of machine thanks to adjustment to optimum speeded commutation and formation of lead signals of gain factors. 6 dwg
