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:
Jun. 04, 1991
Filed:
Jan. 10, 1990
Jurgen Maass, Wiesloch, DE;
Helmut Meyer, Weinheim, DE;
Heidelberger Druckmaschinen AG, Heidelberg, DE;
Abstract
A device for determining the rotational speed and position of a rotor of an electric motor having at least one signal track arranged on the rotor includes at least one sensor located at a stator-side of the electric motor for scanning the signal track, and an evaluation circuit connected to the sensor, the sensor being sensitive to given stimuli of the signal track for alternatively adopting one of three different states which individually produce levels of different magnitude; the evaluation circuit including detectors responsive in accordance with the levels, for cutting off levels of given magnitude so that a recognition of the rotor position is derivable from a first and a second one of the three states, and the rotational speed is derivable from the third one of the three states.