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. 22, 2009
Filed:
Apr. 20, 2005
Yoshinobu Honkura, Aichi-ken, JP;
Hiroshi Matsuoka, Aichi-ken, JP;
Masahiko Kato, Aichi-ken, JP;
Daisuke Nagaya, Aichi-ken, JP;
Yoshinobu Honkura, Aichi-ken, JP;
Hiroshi Matsuoka, Aichi-ken, JP;
Masahiko Kato, Aichi-ken, JP;
Daisuke Nagaya, Aichi-ken, JP;
Aichi Steel Corporation, Tokai-shi, Aichi-ken, JP;
Abstract
To realize an anisotropic bonded magnet that reduces cogging torque without lowering output torque. The present invention provides a hollow cylindrically shaped anisotropic bonded magnet for use in a 4-pole motor, formed by molding anisotropic rare-earth magnet powder with resin. The alignment distribution of the anisotropic rare-earth magnet powder in a cross section perpendicular to the axis of the anisotropic bonded magnet is in the normalized direction of the cylindrical side of the hollow cylindrical shape in the main region of a polar period, and in a transition region in which the direction of the magnetic pole changes, steadily points towards a direction tangential to the periphery of the cylindrical side at points closer to the neutral point of the magnetic pole, and becomes a direction tangential to the periphery of the cylindrical side at that neutral point, and steadily points toward the normalized direction of the cylindrical side at points farther away from the neutral point.