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. 19, 1994
Filed:
Jul. 23, 1991
Martin Burgbacher, St. Georgen, DE;
Michael Hermann, Villingen-Schwenningen, DE;
Papst Licensing GmbH, Spaichingen, DE;
Abstract
A brushless direct current motor has a substantially cylindrical, external permanent magnet rotor having a plurality of north poles and south poles. The rotor surrounds a substantially cylindrical stator provided with a plurality of main poles between which auxiliary poles are interspersed. An annular gap is defined between the rotor and the stator. To reduce magnetic or reluctance caused fluctuation of the motor torque, each main pole of the stator has an angular extent which substantially corresponds to that of a rotor pole. Furthermore, the stator periphery is provided with protuberances arranged such that permanently magnetically caused components of torque ripple are reduced.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile