TY JOUR TI Mechatronic module with variable geometry and winding external magnetic system KW double spiral spatial element KW electrodynamic KW external magnet. JO Actual directions of scientific researches of the XXI century: theory and practice AU Bokher, R.. AU Litvinenko, A.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov