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:
Apr. 24, 2001
Filed:
Aug. 03, 1998
Wolfgang Schulter, Meersburg, DE;
Dieter Driendl, Deggenhausertal, DE;
Erwin Kessler, Saulgau-Bolstern, DE;
Stephan Kimpfler, Oberteuringen, DE;
Kurt Kleiner, Messkirch, DE;
Temic Telefunken Microelectronics GmbH, Heilbronn, DE;
Abstract
A method is presented for detecting the position and the direction of motion of a movably mounted part on an electric motor that makes provision not only for a single-channel sensor but also a measuring arrangement for the motor current and the rectified motor current by means of which the motor current is activated after operating switching devices to reverse the polarity of the voltage applied to the motor to cause a reversal of the direction of motion. The measuring arrangement establishes from the variation of the motor current over time the point of time of the motor current maximum and transmits this to the evaluation logic. The point of time of the actual reversal of the direction of motion is derived from the point of time of the motor current. Preferably, the current is measured as a reference current value even before falling through the zero crossing. By means of a calculating unit that simulates a motor state model, the measured values of motor current, motor voltage and motor speed can also be used to ascertain by calculation the time of reversal of the direction of motion and the current threshold value.