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:
Oct. 21, 2008
Filed:
Jan. 23, 2006
Michael Ludwig, Sinsheim, DE;
Oliver Lamparth, Maxzell, DE;
Arno Kutzki, Keltern, DE;
Matthias Rupprecht, Straubenhardt, DE;
Michael Ludwig, Sinsheim, DE;
Oliver Lamparth, Maxzell, DE;
Arno Kutzki, Keltern, DE;
Matthias Rupprecht, Straubenhardt, DE;
Harman International Industries, Incorporated, Northridge, CA (US);
Abstract
An electric motor system having a rotor with a plurality of permanent magnets, and a stator having a winding through which current is flowing for driving the rotor. A control unit controls the current flowing through the winding. The control unit employs a first filter and a second filter, each filter is connected to the winding and has outputs coupled to a comparator. The comparator compares the signal output of the first filter to the signal output of the second filter. The control unit controls the current flowing through the winding depending on the result of the comparison of the two filtered signals.