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:
Jul. 20, 2010
Filed:
Nov. 13, 2006
Thomas Dufner, Schonach, DE;
Frank Heller, Königsfeld-Burgberg, DE;
Arno Karwath, Deisslingen, DE;
EBM-Papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated motor has a permanent-magnet rotor () having: at least two rotor poles (); at least one phase (); a power stage (); and a rotor position sensor (). Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current (): A) after a change of the rotor position signal (), referred to as a first pole change, a first value (I_MEAS(HCnt−1)) of the current through the at least one phase () is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt−1)), a new commutation is carried out; C) after a change of the rotor position signal (), referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt−1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.