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:
Jul. 03, 2007
Filed:
Sep. 14, 2004
Yasuhiro Miyamoto, Fukuoka, JP;
Yasuhiro Miyamoto, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
A moving magnet type linear actuator is provided, which can solve a problem of linear guide life even in case that magnetic attraction force between a magnet and an armature is reduced to perform a high-frequent acceleration and deceleration operation. A stator of the linear actuator includes an armaturewhich is fixed onto a stator baseand has plural coilsand linear guide railsarranged linearly so as to sandwich both sides of the armatureand a mover of the same includes a linear guide blockprovided so as to slide on the linear guide railand a field magnet provided with plural field permanent magnetswhich are arranged opposed to the armature part through an air gap, held in a hole portionA provided in anonmagnetic magnet holderand arranged so that magnetic poles of the N-pole and the S-pole are different alternately, and with a magnetic back yokearranged in the back of the field permanent magnetthrough an air gap, provided in a recess partB provided in a magnet holderand formed by laminating thin plate-shaped electromagnetic steel plates.