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:
Nov. 06, 2007
Filed:
Sep. 25, 2003
Alexander Hahn, Sauldorf-Boll, DE;
Alexander Hahn, Sauldorf-Boll, DE;
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An apparatus serves to sense the absolute value of the rotational position of a shaft (). The apparatus has a first single-turn rotary encoder () that is arranged at one end () of the shaft () and is arranged to sense the latter's rotational position within a single shaft revolution. Also provided are: a multi-turn rotary encoder unit which senses the number of revolutions of the shaft () and which comprises a reduction gear linkage (); a rotary element (), driven by the output of the linkage, that is oriented as an imaginary continuation of the shaft () and coaxially therewith; and a second single-turn rotary encoder () which is arranged to sense the rotational position of the rotary element () within a single revolution. The reduction gear linkage () surrounds the shaft (), and its output element () is connected, via a connecting member (), to said rotary element () around the first single-turn rotary encoder (). An unusually compact combination motor/encoder unit can thereby be achieved, suitable for installation in small spaces, e.g. a few centimeters wide.