Patent ID: 8791607
Filing Date: 2014-07-29
Classification: H02K

Abstract:
1. An electric linear drive comprising: a winding system including a plurality of wound coils which are arranged to be coaxial to each other and successive in axial direction; a magnet system which is movable in an axial direction relative to the winding system and comprises a plurality of axially successive permanent magnets, the coils of the winding system and the permanent magnets of the magnet system defining an air gap thereinbetween; and a sensor for detecting relative movement of the winding system and magnet system, for detecting a relative position of said winding and magnet systems, and for scanning a timing ruler mounted on an outer circumference of the magnet system, said magnet system being radially arranged in an interior of the winding system, and the timing ruler circumferentially extending over a portion of the circumference of the magnet system, wherein the coils of the winding system have a radial bulge accommodating the timing ruler.