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. 24, 1983
Filed:
Apr. 17, 1981
Hirobumi Satomi, Kashiwa, JP;
Oriental Motor Co., Ltd., Tokyo, JP;
Abstract
A four-phase hybrid type stepping motor is disclosed, which comprises a rotor and eight stator poles each formed on a plane facing to an outer side surface of the rotor with a plurality of stator teeth, wherein a pitch between a center of the stator teeth of the first one of the eight stator poles and a center of the stator teeth of the fourth stator pole, a pitch between the center of the stator teeth of the fourth stator pole and a center of the stator teeth of the seventh stator pole and a pitch between the center of the stator teeth of the seventh stator pole and a center of the stator teeth of the second stator pole are common and equal to .tau..sub.c defined as follows: ##EQU1## where Z.sub.R is the number of the rotor teeth and N is an integer close to 3.multidot.Z.sub.R /8.