a friction gear permanent magnetic entrainment means for rolling transmission of motion in combination with a magnetic - technical system having one magnetic circuit comprising at least two magnets and at least one operating air gap , including a frame being composed of symmetrically arranged permanent magnets and symmetrically arranged mild iron or steel parts , with the mild iron or steel parts arranged between analogous poles of the magnets forming central frontal surfaces drawn into the interior of the frame , which central frontal surfaces are opposing one another forming an operating air gap with opposite polarities in the direction of magnetizing .