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:
Jan. 09, 2001
Filed:
Apr. 13, 1999
Yutaka Ishizuka, Nagano, JP;
Kabushiki Kaisha Sankyo Seiko Seisakusho, Tokyo, JP;
Abstract
A cylindrical yoke,bonded to an inner surface,of a cylindrical portion,of a rotor case,of a motor has a yoke separating slit,for separating the yoke,in the circumferential direction. A cylindrical rotor magnet,is partially bonded to an inner surface,of the yoke,at a plurality of bonded portions,formed apart from one another for the same intervals in the circumferential direction. When the cylindrical portion,has been expanded by heat, the yoke separating slit,is expanded and the yoke,follows the non-bonded portion of the cylindrical portion,Therefore, distortion of the cylindrical portion,can be prevented. In the non-bonded portions,between the yoke,and the rotor magnet,deformation occurs such that an inner surface,of the yoke,is separated from an outer surface,of the rotor magnet,Thus, damage of the rotor magnet,can be prevented.