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:
Nov. 27, 2001
Filed:
Nov. 03, 1999
Kazunori Akama, Tokyo, JP;
NGB Corporation, Tokyo, JP;
Abstract
A stepping motor,having a configuration which includes: a rotor,constituted by a rotor magnet,magnetized circumferentially; a stator,constituted by a plurality of phases of stator yokes,to,arranged side by side in an axial direction of the stepping motor so as to surround the rotor, and coils,to,wound in coil winding portions defined by the stator yokes; an armor member,for holding the stator yokes with respect to the axial direction of the stepping motor; and each phase of the stator yokes being constituted by a pair of stator yokes on which magnetic pole teeth of plural phases arranged annularly are combined alternately; wherein the stator yokes are arranged so that every two phases of the stator yokes are paired to form an even number of sets of stator yokes; wherein two phases a and b and c and d in each set of the stator yokes are reverse to each other; and wherein coils,and,and,and,provided on the two phases of stator yokes in each set are connected to generate magnetic fields in series and in reverse to each other.