TY JOUR TI 3D model of the stress-strain state of the locomotive traction electric motor insulation KW locomotive traction electric motor KW thermal processes of electric machines KW insulation aging KW thermomechanical stresses KW and reliability of electric machines JO Bulletin of scientific research results AU Shrayber, M.A. AU Grachev, V.V. AU Grischenko, A.V. PY 2026 IS 2026 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"