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:
Sep. 14, 1999
Filed:
May. 16, 1997
Hisafumi Yasuda, Tokyo, JP;
Namiki Precision Jewel Co., Ltd., Tokyo, JP;
Abstract
A coreless motor device having a rotor comprised of a cylindrical coil, a coil support, a rotary shaft inserted and stabilized in the center of the coil support, and a commutator installed either on the coil support or rotary shaft is disclosed. A cylindrical field magnet is positioned on the inside of the cylindrical coil, and one end of the cylindrical field magnet is affixed at a bottom of a cylindrical housing that surrounds the outer circumference of the cylindrical coil. The rotary shaft of the motor is supported by a thrust bearing at the end of the cylindrical field magnet opposite the end that is affixed at the bottom of the cylindrical housing, and it is also supported by a multiple number of radial bearings installed at intervals on the upper part of the cylindrical housing.