FIELD: electricity.
SUBSTANCE: invention relates to the sphere of electrical engineering and can be used in electric machine with converter-controlled drive. Frequency converter (VFG) is made so that at Campbell diagram for working machine (WM) there are crossing points of own torsional frequency of the machine (M) rotor (R) with V-shaped symmetrical straight lines of interharmonic excitation frequency for output frequencies F1, F2, F3, … Fi. Frequencies F1, … Fi are grouped in the area G1, …, Gi, … Gz of concentration against machine rotational frequency. In Gi Fi are jointed close to each other o that in each case they have common initial point at axis of abscissae. The upper and lower boundaries of the area G1, …, Gi, … Gz of concentration are defined by cross point of the lowest and/or the second lowest frequency, and/or the third lowest frequency among own frequencies of rotor torsional oscillations with two straight lines of the first order interharmonic beams in the respective area G1, …, Gi, … Gz of concentration. Each area G1, …, Gi, … Gz of concentration defines the forbidden area (FA). The machine has operating range (OR) of rotational frequency that is outside forbidden areas (FA).
EFFECT: improved operational performance of machines.
12 cl, 3 dwg
