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. 04, 1993
Filed:
Sep. 27, 1991
Takanori Hamajima, Chita, JP;
Aisien Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A linear actuator comprises a shaft made of non-magnetic material for being reciprocatingly moved in an axial direction of the shaft, a plurality of ring-shaped moving cores which are located on the shaft and arranged in the axial direction thereof, and each of which is made of magnetic material, a first spacer made of non-magnetic material and interposed between two adjacent moving cores, a plurality of ring-shaped permanent magnets each of which is disposed on one of the respective ring-shaped moving cores and each of which includes a plurality of magnets arranged in the circumferential direction in such a manner that adjacent magnets are different in polarity, and a stationary core located around each of the permanent magnets with a clearance. The stationary core is formed with an outer ring portion formed, magnetic poles which face the permanent magnets, and legs which connect the outer ring portion and the magnetic poles. Coils are wound around the legs. The moving cores and the stationary core are formed of a plurality of thin plates laminated to one another and made of magnetic material. The number of stationary cores in the axial direction of the shaft is smaller than the number of permanent magnets by one, and the polarity of the permanent magnets are formed in the radial direction of the shaft.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile