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. 01, 2001
Filed:
Feb. 29, 2000
Masakazu Hattori, Gifu, JP;
Naohiro Makino, Gifu, JP;
Teijin Seiki Co., LTD, Tokyo, JP;
Abstract
An electromagnetic force motor comprising: a magnetic housing having a housing chamber formed therein; a stationary magnetic member received in the housing chamber in stationary relationship with respect to the magnetic housing; a movable magnetic member received in the housing chamber to be movable with respect to the stationary magnetic member, the stationary magnetic member, and the movable magnetic member forming with a magnetic flux gap to permit a magnetic flux to pass therethrough, the magnetic housing, the stationary magnetic member, and the movable magnetic member each made of a magnetic substance and collectively forming a magnetic circuit unit that is to allow a magnetic flux to pass therethrough; a permanent magnet positioned in the housing chamber and generating a magnetic flux; and an electromagnetic coil positioned in the housing chamber and generating a magnetic flux with an electric current imparted thereto, the magnetic circuit unit partly having a diminished cross-sectional area being small enough to ensure that the magnetic circuit unit is saturated with the magnetic flux as the movable magnetic member is positioned in the neighborhood of the first axial position of the movable magnetic member, the width of the magnetic flux gap being small enough to ensure that the strength of the magnetic attraction between the stationary magnetic member and the movable magnetic member increases in response to the increased density of the magnetic flux flowing between the magnetic surface of the stationary magnetic member and the magnetic surface of the movable magnetic member with an increase rate increasing as the movable magnetic member is positioned in the neighborhood of the first axial position of the movable magnetic member, the diminished cross-sectional area of the magnetic circuit unit and the width of the magnetic flux gap being each small enough to ensure that the strength of the magnetic attraction between the stationary magnetic member and the movable magnetic member substantially linearly increases in response to the increased level of the electric current imparted to the electromagnetic coil under the influence of each of the diminished cross-sectional area of the magnetic circuit unit and the width of the magnetic flux gap as the movable magnetic member is positioned in the neighborhood of the first axial position of the movable magnetic member.