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:
Dec. 04, 2001
Filed:
Sep. 07, 1999
Tadao Yamaguchi, Isesaki, JP;
Naohisa Koyanagi, Isesaki, JP;
Tokyo Parts Industrial Co., Ltd., Isesaki, JP;
Abstract
A dc brushless vibrator motor has a base member, a shaft connected to the base member, a stator having magnetically conductive cores and respective armature coils angularly uniformly disposed about the shaft and having an eccentric mass distribution. The rotor has a magnet holder, an annular permanent magnet fixedly connected to the magnet holder and concentric with the shaft and radially outside the stator. The magnet has alternating north and south magnetic poles arranged at a uniform angular pitch. In order to rotationally imbalance the rotor, an arcuate weight is fixed to the magnet holder and/or a part of the magnet holder is cut out.