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. 30, 2009
Filed:
Jun. 01, 2007
Jens Löffler, Villingen-Schwenningen, DE;
Arnold Kuner, St. Georgen, DE;
Jens Löffler, Villingen-Schwenningen, DE;
Arnold Kuner, St. Georgen, DE;
EBM-Papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated motor (ECM) has terminals () for connection to a DC power source (). It has a permanent-magnet rotor (), also a first and a second series circuit () in each of which a stator winding strand () is connected in series with a controllable semiconductor switch (), which two series circuits are connected in parallel to form a parallel circuit (). In addition to the strand-connected switches () typically found in an ECM, in a supply lead to said parallel circuit (), a third controllable semiconductor switch () controls energy supply from the DC power source (). In order to increase motor efficiency and minimize the size of any motor capacitor required, special switching steps are performed so that electromagnetic energy, remaining in the winding(s) after shutoff of power application, is converted into motor torque, instead of being dissipated as heat.