Abstract: An actuating magnet comprises a magnet body (10), an exciting winding (15) rranged in the said magnet body (10) and a radially movable armature (17) having a pre-determined first radial cross-sectional surface. One end of the armature (17) having a second radial cross-sectional surface (19) substantially larger than the said first cross-sectional surface (20) forms a pole piece (18). Between the said pole piece (18) and a wall (11) of the said magnet body (10) which covers in the radial direction at least part of one end face of the said exciting winding (15) there is provided an air gap (20).In order to increase the actuating force of the magnet without changing its outer dimensions and to provide a closed system, the wall (11) covers the said end face of the exciting winding (15) and shields it magnetically, the pole piece (18) is arranged opposite to the inside of the said wall (11) and the air gap (20) extends in the radial direction (FIGS. 1a+b).

Abstract: A linear servo drive comprises substantially a drive section (29) and a ciage (30) running on the latter. The carriage (30) is seated on the drive section (29) via a roller bearing consisting of guide strips (36) extending in the axial direction and coacting with rollers (37, 37a to 37c).In order to increase the mechanical loading capacity of the drive section and, thus, of the entire drive and to reduce at the same time its weight, the drive section (29) is given a radial cross-section exhibiting flange-like end portions (34) extending in a star-like pattern from a central area (32) and provided with surface portions which extend in an approximately radial direction and which define the plane of the roller bearing.