In an electromechanical energy converter having an outer body and an inner body, which are mounted movably relative to one another about an axis of rotation, an outer body according to the invention surrounds an annular structural element, a permanent magnet and a support ring which is received concentrically in the structural element. The support ring comprises a recess to receive the permanent magnet, and the recess has a boundary surface which extends parallel as to a radius of the axis of rotation.