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:
Apr. 12, 2011
Filed:
May. 10, 2005
Hiroaki Ito, Tokyo, JP;
Mimpei Morishita, Tokyo, JP;
Yosuke Tonami, Tokyo, JP;
Toshiba Elevator Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnet unit includes a first magnetic pole (), a second magnetic pole () and a third magnetic pole () at a center between the first magnetic pole () and the second magnetic pole (), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole () and the third magnetic pole () by connecting two electromagnets () with each other through a permanent magnet (), while a second magnet is defined between the second magnetic pole () and the third magnetic pole () by connecting two electromagnets () with each other through a permanent magnet (). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets () up to their respective magnetic poles. By controlling exciting currents to the respective magnetic poles. By controlling exciting currents to the respective electromagnets (), it is also possible to adjust fluxes (or flux density) in respective directions x, y individually.