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:
Oct. 27, 1987
Filed:
Dec. 16, 1986
Applicant:
Inventor:
Nagahiko Nagasaka, Iruma, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
335222 ; 335229 ;
Abstract
In the permanent magnet type actuator, an armature made of a hollow cylindrical permanent magnet is held to be movable in its axial direction. A stator made of an electromagnet comprises a magnet core having two portions one placed outside of the permanent magnet and the other placed inside of the same, thereby applying a unipolar magnetic field to the armature. A plurality of inductor teeth are formed on the surfaces of the core portions opposing to each other, and means are further provided for energizing a coil of the electromagnet by an exciting current and driving the armature in its axial direction.