TY JOUR TI Frictional moment variation and friction loss change in the magnetic fluid seal of a frequency-controlled electromotor shaft depending on the operating mode changes KW friction moment KW magnetic-liquid seal KW electric motor KW operating mode JO Science intensive technologies in mechanical engineering AU Vlasov, A.M. AU Kazakov, Y.B. AU Vedernikova, I.I. PY 2026 IS 2026 PB Bryansk State Technical University