Abstract: A linear motor includes a rotor (70) and a secondary member (80), wherein the secondary member (80) carries a cover for protection against mechanical damage, aggressive liquids etc. The cover (40) has low magnetizable material and is held in place by magnetic elements (30) of the secondary member. Thus, there is no need to secure the cover additionally by gluing etc and the cover can be easily replaced. The cover can be placed, preferably, as one piece upon the secondary member, which may be made of several secondary member elements, and carries a scale for controlling the position of the motor.

Abstract: A linear drive, comprising a primary part (3) arranged on a slide block (1), wherein the slide block (1) is movable on a guide-rail system (21,22), as well as comprising a stationary secondary part (4), which operates together with the primary part (3) in such a way that the slide block (1) is movable on the guide-rail system (21,22). In order to facilitate insertion and extraction of the primary part (3), a spacer (5) is proposed to be arranged between primary part (3) and slide block (1), which is removable during the dismantling of the primary part (3) from the slide block (1) and thus the separation between primary part (3) and secondary part (4) is adjustable.

Abstract: The invention relates to control device and control process for motors. In order to prevent phase distortion and the like in controlled systems, a sensor (250) for detecting the state of movement of a motor (200) is provided directly on or in the force transmission interface (270) of the motor. The sensor can, for example, determine the position, speed or acceleration directly. The invention is particularly suitable for controlling linear motors in high-precision applications, such as machine tools, milling machines or pick-and-place robots.

Abstract: The invention relates to a machine for machining workpieces, for example a milling machine or a lathe, including imbalance sensors (60) for determining the imbalance of a rotary element, i.e. the cutter head (40) or of the workpiece (10) to be worked on. The advancement of the workpiece (10) relative to the tool (40) is so corrected in dependence on signals of the imbalance sensors (60) that a possible imbalance deflection of the tool (40) can be compensated. Correspondingly, the tool feed can be so controlled in a lathe in dependence on the rotation angle position and the determined imbalance that balancing can be carried out during or directly after treatment of an imbalance.