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:
Apr. 26, 2005
Filed:
Mar. 17, 2004
Yoshihiko Kuriyama, Saitama-ken, JP;
Keiko Kikuchi, Saitama-ken, JP;
Yoshihiko Kuriyama, Saitama-ken, JP;
Keiko Kikuchi, Saitama-ken, JP;
Hitachi Metals Ltd., Tokyo, JP;
Abstract
An magnetic-field-generating apparatus comprising permanent magnet segments arranged to form a ring-shaped magnetic circuit having a center hole; adjacent permanent magnet segments having such different magnetization directions that their magnetization directions successively change along a circumferential direction of the magnetic circuit; a basic magnetization phase angle θ between the magnetization directions of the adjacent permanent magnet segments being 720/N (°); and a magnetization direction of at least one permanent magnet segment in an essential unit obtained by circumferentially dividing the ring to ¼ being deviated from the basic magnetization phase angle θ by such a deviating angle that a uniform magnetic flux flows in one direction along a diameter of the center hole.