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:
May. 13, 2014
Filed:
Oct. 28, 2009
Ryota Hiura, Hyogo, JP;
Takakatsu Nozawa, Hyogo, JP;
Katsuhiro Hirata, Osaka, JP;
Hiroshi Ishiguro, Osaka, JP;
Yoshihiro Nakata, Osaka, JP;
Ryota Hiura, Hyogo, JP;
Takakatsu Nozawa, Hyogo, JP;
Katsuhiro Hirata, Osaka, JP;
Hiroshi Ishiguro, Osaka, JP;
Yoshihiro Nakata, Osaka, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Osaka University, Osaka, JP;
Abstract
A linear actuator includes a coil portion and a shaft portion. The coil portion includes a plurality of coils respectively applied with AC currents having different phases from one another. The shaft portion passes through an inside of the plurality of coils. The shaft portion includes: a plurality of permanent magnets and a plurality of intermediate members. The plurality of permanent magnets is arranged along a central axis C such that opposite magnetization directions face to each other in a direction of the central axis C. Each of the plurality of intermediate members is arranged between adjacent two of the plurality of permanent magnets. A saturation magnetic flux density of each of the plurality of intermediate members is higher than a saturation magnetic flux density of each of the plurality of permanent magnets.