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. 07, 1987
Filed:
Jan. 10, 1986
Hitachi, Ltd., Tokyo, JP;
Abstract
A linear motor comprises a first magnetic pole having a plurality of uneven magnetic pole teeth of magnetic material arranged longitudinally at predetermined regular intervals of length, and a second magnetic pole having a yoke and plurality of uneven magnetic pole teeth made of magnetic material opposed to the first magnetic pole with a slight gap and a coil wound on each magnetic pole tooth and the permanent magnets, in which the relative position of the first and second magnetic poles in the longitudinal direction can be varied. The longitudinal lengths of the protruded portion of the second magnetic pole are substantially equal with each other. The longitudinal length of the recessed portion of the second magnetic pole is set to about one-third of the longitudinal length of the protruded portion of the first magnetic pole. The number of the protruded portions of the first magnetic pole is set to be a multiple of two.