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. 23, 2001
Filed:
Dec. 12, 2000
Arnold Kuner, St. Georgen, DE;
Frank Jeske, St. Georgen, DE;
Irmgard Moosmann, Königsfeld, DE;
Michael Moosmann, Königsfeld, DE;
Christian Moosmann, Königsfeld, DE;
Papst-Motoren GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated motor has at least two winding phases (,) which are wound together or otherwise inductively coupled. Current in each phase is controlled by a respective power transistor (,). An integrated circuit controller (,) receives signals from a Hall sensor (,) and generates rotor position output signals (OUT,, OUT,) which are oppositely phased and are applied to the bases of the respective power transistors (,) so that the power transistors never both conduct at the same time. Further, a pair of latching transistors (,) and a pair of base drain resistors (,), connected to respective bases of the power transistors (,) are provided, in order to assure “soft” switching of the power transistors at low RPM, yet prompter switching and higher efficiency at high RPM. These additional components also ensure a sufficiently long current gap between switch-off of one power transistor and switch-on of the other power transistor.