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:
Aug. 15, 1989
Filed:
Apr. 06, 1988
Hideki Nihei, Hitachi, JP;
Kunio Miyashita, Hitachi, JP;
Kouichi Saitoh, Kitaibaraki, JP;
Seizi Yamashita, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a large-thrust stepping motor improved in thrust constant by provision of slots at equal intervals between adjacent N and S poles of a permanent magnet disposed on a movable member of the motor or by division of the winding for each phase of a stator of the motor into two or more sections to pass currents independently through the divisional sections in accordance with the speed of the motor. Further, the invention provides a large-thrust stepping motor using a field magnet having large magnetomotive force, the field magnet being formed by combination of a magnet substrate and permanent magnets independent from the magnet substrate.