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:
May. 07, 2002
Filed:
Feb. 10, 1998
Applicant:
Inventors:
Arno Karwath, Rottweil, DE;
Mojtaba Moini, Königsfeld, DE;
Eberhard Wünsch, St. Georgen, DE;
Assignee:
Papst Licensing GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 1/18 ;
U.S. Cl.
CPC ...
H02P 1/18 ;
Abstract
A drive circuit for brushless DC motors including a rotor and a stator with at least one stator coil includes a commutation device which supplied commutation pulses of drive current to the state coil(s). The commutation device senses the rotor position and calculates current rotor speed therefrom. The rotor speed is then used to shift the commutation circuits according to predetermined functions. The shifting of commutation currents is occasioned by shifting either or both of ignition part of a commutation pulse and the extinction part of such pulse.