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:
Feb. 01, 2011
Filed:
Jan. 20, 2006
Claus Föll, Reute, DE;
Frank Jeske, St. Georgen, DE;
Arnold Kuner, St. Georgen, DE;
Jens Löffler, St. Georgen, DE;
Claus Föll, Reute, DE;
Frank Jeske, St. Georgen, DE;
Arnold Kuner, St. Georgen, DE;
Jens Löffler, St. Georgen, DE;
EBM-PAPST St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
A two-stranded electronically commutated DC motor has a permanent-magnet rotor (), power supply terminals () for connecting the motor to a current source () and a stator () having a winding arrangement which includes first and second winding strands (). The latter are controlled by respective first and second semiconductor switches (). The motor also has a third controllable semiconductor switch (), arranged in a supply lead from one of the terminals () to the winding strands (), which third switch is alternately switched on and off by applying to it a PWM (Pulse Width Modulated) signal. During switch-off intervals, magnetic flux energy stored in the motor causes a decaying loop current (i) to run through the windings, continuing to drive the rotor. This facilitates conformal mapping of temperature information in the PWM signal onto a target motor rotation speed.