Abstract: Linear electric actuator (1) comprising a housing (10) with a reversible DC-motor (2), which through a transmission (3) can move an activation element (6) between two end positions, where an incremental position detection system is adapted to indicate the position of the spindle nut (5) during its travel on the spindle (4) and where the accuracy of the position detection system continuously is calibrated in that a magnet (15) is arranged in connection with the spindle nut (5), and at least one magnetic sensor (13,14) is arranged within the housing (10) of the actuator in a position where a proximity with the magnet (15) arranged in connection with the spindle nut (5) on its travel on the spindle (4) is achieved to establish a reference point for the position detection system.

Abstract: Linear electric actuator (1) comprising a housing (10) with a reversible DC-motor (2), which through a transmission (3) can move an activation element (6) between two end positions, where an incremental position detection system is adapted to indicate the position of the spindle nut (5) during its travel on the spindle (4) and where the accuracy of the position detection system continuously is calibrated in that a magnet (15) is arranged in connection with the spindle nut (5), and at least one magnetic sensor (13,14) is arranged within the housing (10) of the actuator in a position where a proximity with the magnet (15) arranged in connection with the spindle nut (5) on its travel on the spindle (4) is achieved to establish a reference point for the position detection system.

Abstract: A motor operator for switchgear (1) for use in mains power distribution systems such as public medium high voltage distribution systems, where the switchgear comprises a closed cabinet (2) with an operating shaft (6) accessible from the front surface (4). The operating shaft is rotatable at least between two positions and has, a coupling part. The motor operator comprises a worm gear in a separate worm gear housing (11), which is mountable on the external surface of the switchgear cabinet. An adapter (21) with a connection shaft (22) is located in a recess in the worm wheel (16). The worm of the worm gear is connected to a motor which could be located remotely from the worm gear housing and connected to the worm preferably by means of a flexible shaft (15). This renders it possible to mount the motor operator in confined spaces.

Abstract: A motor operator for switchgear (1) for use in mains power distribution systems such as public medium high voltage distribution systems, where the switchgear comprises a closed cabinet (2) with an operating shaft (6) accessible from the front surface (4). The operating shaft is rotatable at least between two positions and has, a coupling part. The motor operator comprises a worm gear in a separate worm gear housing (11), which is mountable on the external surface of the switchgear cabinet. An adapter (21) with a connection shaft (22) is located in a recess in the worm wheel (16). The worm of the worm gear is connected to a motor which could be located remotely from the worm gear housing and connected to the worm preferably by means of a flexible shaft (15). This renders it possible to mount the motor operator in confined spaces.