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:
Feb. 28, 2006
Filed:
Aug. 13, 2003
Houng Joong Kim, Hitachi, JP;
Kohji Maki, Hitachi, JP;
Hisao Tadokoro, Hitachi, JP;
Hideki Shimane, Mito, JP;
Hitoshi Shibata, Hitachi, JP;
Keijiro Sakai, Kanasago, JP;
Houng Joong Kim, Hitachi, JP;
Kohji Maki, Hitachi, JP;
Hisao Tadokoro, Hitachi, JP;
Hideki Shimane, Mito, JP;
Hitoshi Shibata, Hitachi, JP;
Keijiro Sakai, Kanasago, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The conventional linear drive apparatus has the problem that in constructing a linear motor of a multiphase structure by connecting a plurality of armature units, the length of the armature becomes longer in proportion to the number of the phases, thus limiting the locations where the apparatus can be installed. The problem is solved by a linear drive apparatus comprising a plurality of armature unitsformed by a magnetic material on which a conductor coilis disposed, and an armature comprising an arrangement of the armature units. The armature unitscomprise a plurality of opposing portions having opposing magnetic pole teeth. The magnetic pole teeth of adjacent opposing portions are arranged in an interdigitated manner. A secondary memberis disposed between magnetic pole teeth of the opposing portions. The armature unitscomprise the coilarranged on opposite sides thereof in an alternating manner.