TY JOUR TI Calculation of Parasitic Capacitances of an Asynchronous Traction Motor with Variably-Frequency Drives KW asynchronous motor KW common-mode voltage KW equivalent circuit KW parasitic capacitance KW bearing KW bearing current JO Proceedings of Petersburg Transport University AU Karmanov, A.V. PY 2026 IS 23 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"