The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2014
Filed:
Jan. 12, 2011
Alexis Boletis, Lucerne, CH;
Hugo Fritschy, Sachseln, CH;
Remo Hofstetter, Lucerne, CH;
Jens Oliver Schulze, Giswil, CH;
Raniero Pittini, Hergiswil, CH;
David Ramon, Ennetmoos, CH;
Max Erick Busse-grawitz, Alpnach Dorf, CH;
Alexis Boletis, Lucerne, CH;
Hugo Fritschy, Sachseln, CH;
Remo Hofstetter, Lucerne, CH;
Jens Oliver Schulze, Giswil, CH;
Raniero Pittini, Hergiswil, CH;
David Ramon, Ennetmoos, CH;
Max Erick Busse-Grawitz, Alpnach Dorf, CH;
Maxon Motor AG, Sachseln, CH;
Abstract
The present invention relates to an electric linear drive, particularly for a rotary-lifting motor. Such a linear drive includes a winding system including a plurality of wound coils which are arranged to be coaxial to each other and successive in axial direction, and a magnet system which is movable in axial direction relative to the winding system and includes a plurality of axially successive permanent magnets. The winding system is normally fed by a controlled converter. The coils of the winding system and the permanent magnets of the magnet system define an air gap thereinbetween. Furthermore, a sensor is provided for detecting the relative movement of winding system and magnet system and for detecting the relative position of the two systems, the sensor being used for scanning a timing ruler mounted on the outer circumference of the magnet system. The magnet system is radially arranged in the interior of the winding system, and the timing ruler circumferentially extends only over a portion of the circumference of the magnet system. According to the invention it is either provided that the coils of the winding system have a radial bulge for the timing ruler, or that the magnet system is eccentrically arranged relative to the winding system, or that the magnet system includes a radial bulge in the form of a flat portion for the timing ruler.