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. 04, 2011
Filed:
Aug. 02, 2007
Kazuto Sakai, Yokosuka, JP;
Masanori Arata, Yokohama, JP;
Kazuto Sakai, Yokosuka, JP;
Masanori Arata, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A rotor of a permanent-magnet-type rotating electrical machine of the present invention has a plurality of magnetic poles in point symmetry with respect to a rotation center of a rotor core. For each of the magnetic poles, there are arranged a permanent magnetwhose product of a coercive force and a magnetizing direction thickness is small and a permanent magnetwhose product of a coercive force and a magnetizing direction thickness is large. The permanent magnetwhose product of a coercive force and a magnetizing direction thickness is small is irreversibly magnetized by a magnetic field created by a current of an armature coil, to change a total linkage flux amount. This realizes a wide-range variable-speed operation of high output, to provide the rotating electrical machine with a wide operating range and high efficiency.