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:
Sep. 06, 2005
Filed:
Dec. 21, 2001
Method for commutating an electronically commutated dc motor, and motor for carrying out said method
Hansjörg Berroth, VS-Obereschach, DE;
Alexander Hahn, Sauldorf, DE;
Frank Heller, St. Georgen, DE;
Frank Jeske, St. Georgen, DE;
Arno Karwath, Rottweil, DE;
Arnold Kuner, St. Georgen, DE;
Hans-dieter Schondelmaier, St. Georgen, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Günther Strasser, St. Georgen, DE;
Hansjörg Berroth, VS-Obereschach, DE;
Alexander Hahn, Sauldorf, DE;
Frank Heller, St. Georgen, DE;
Frank Jeske, St. Georgen, DE;
Arno Karwath, Rottweil, DE;
Arnold Kuner, St. Georgen, DE;
Hans-Dieter Schondelmaier, St. Georgen, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Günther Strasser, St. Georgen, DE;
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An improved method of commutating an electronically commutated DC motor shuts off application of power between the end of one current pulse and the beginning of the subsequent current pulse. Based upon the instantaneous rotation speed, one calculates at what instant to shut off the power. During the power interruption, the disconnected winding is operated in short-circuit mode using two MOSFET transistors, and the decay of the current is monitored. When the current reaches a predetermined reduced value, the terminals of the winding are switched to a high-resistance state, until the subsequent current pulse is started. This has the advantage that less reactive power occurs during operation, and one need not install as bulky a storage capacitor as the capacitors used heretofore.