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:
Jun. 15, 2010
Filed:
Dec. 07, 2006
Koji Harada, Hitachinaka, JP;
Koji Harada, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A rotor core which has relatively high rigidity, can ensure sufficient magnetic performance, and can be produced at a cheaper cost with a relatively small-scale facility. A claw-equipped core and a yoke are manufactured separately. After fitting the yoke to a fitting portion formed in the claw-equipped core, a part of the claw-equipped core in the vicinity of the fitting portion is axially pressed to plastically flow into an annular groove formed in the yoke, thereby integrally joining the claw-equipped core and the yoke to each other. Thus, a large-scaled manufacturing facility is not required, and claws of the claw-equipped core are hard to open in the radial direction even under the action of a centrifugal force during high-speed rotation. A stator core and the claws of the claw-equipped core can be positioned closer to each other, and deterioration of magnetic performance can be avoided.