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. 17, 2012
Filed:
Jan. 29, 2009
Benjamin Haas, St. Georgen, DE;
Frank Heller, Königsfeld-Burgberg, DE;
Benjamin Haas, St. Georgen, DE;
Frank Heller, Königsfeld-Burgberg, DE;
EBM-Papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated motor () has a rotor () and a rotor position sensor (), which sensor, during operation, furnishes a rotational position signal (). A stator interacts with the rotor (). The stator has a stator winding strand () in an H bridge (), and a control apparatus () which, during operation, performs the steps of: (A) controlling the H bridge () so that current pulses (+i, −i) flow through the stator winding strand (), in alternate directions, each pulse starting at a first point in time (t); (B) at the beginning of each commutation, starting from a second point in time (t), operating in short circuit the winding strand (), in order to cause a decreasing loop current (I*) through the stator winding strand (), which loop current (I*) reaches zero at a third point in time (t); and (C) stepwise modifying, toward a minimum, the time interval (TCC) between the first and third points in time (t, t).