the invention relates to a rotor for an electrical machine , specially a transversal flow machine , having at least one pole structure . the pole structure encompasses two adjacent rows of magnet arrangements which are alternatively magnetized in the peripheral direction . the rows are separated by an intermediate layer made of magnetically and electrically non - conductive material . the magnet arrangements having of inter - lying collector and soft iron elements . the magnet arrangements interlock with adjacent collector or soft iron elements in the peripheral direction . the collector or soft magnet elements are at least partially provided with an insulating layer . the invention is characterized in that at least one of the collector or soft iron elements that is adjacent in the periphery of the magnet arrangement is devoid of a radially external stop providing at least indirect support for the magnet arrangements in radial direction .