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:
Aug. 03, 2010
Filed:
Jun. 25, 2007
Masashi Kitamura, Mito, JP;
Fumio Tajima, Hitachi, JP;
Yusuke Akami, Yokohama, JP;
Noriyuki Utsumi, Tokyo, JP;
Ken Nakamura, Yokohama, JP;
Kazuaki Shibahara, Yokohama, JP;
Masashi Kitamura, Mito, JP;
Fumio Tajima, Hitachi, JP;
Yusuke Akami, Yokohama, JP;
Noriyuki Utsumi, Tokyo, JP;
Ken Nakamura, Yokohama, JP;
Kazuaki Shibahara, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A cylindrical linear motor includes a stator and a movable element disposed via a clearance with respect to the stator and movable rectilinearly with respect to the stator. The movable element has a plurality of permanent magnets fixed to a movable element core. The stator salient polesare pitched at τs and the permanent magnetsare pitched at τp so that a relationship of 3/4<τp/τs<3/2 is established.