Patent ID: 7859141
Filing Date: 2010-12-28
Classification: F02B,H02K

Abstract:
1. An electrical machine of the transversal-flux type, comprising a stator comprising a plurality of stator elements with magnetic flux conductors and an electric conductor forming a winding extending in an essentially closed winding path through each magnetic flux conductor, and a movable element which comprises a number of permanent-magnet members and which is movable in relation to the stator along a movement path, wherein the movable element is adapted to carry out a linear reciprocating motion, wherein the essentially closed winding path comprises a first current-carrying section extending essentially along the movement path, wherein each magnetic flux conductor is adapted to form, together with one of said permanent-magnet members, a closed magnetic flux circuit extending around said current-carrying section, wherein each permanent-magnet member comprises a primary magnet that has a north pole and a south pole and a magnetic direction extending from the south pole to the north pole and essentially across the movement path, and wherein the permanent-magnet members are arranged in an alternating order in the movable element with respect to the magnetic direction of the primary magnet, characterized in that adjacent permanent-magnet members of the movable element are separated from each other by an intermediate member comprising at least one secondary magnet which has a north pole and a south pole and a magnetic direction extending from the south pole to the north pole and essentially across the magnetic direction of the primary magnet, wherein magnetic fields of adjacent permanent-magnet members and their secondary magnets are operable to mutually repel for essentially avoiding flux fringing in respect of the stator.