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:
Jun. 30, 2009
Filed:
Jun. 02, 2006
Tomonori Kojima, Kanagawa, JP;
Atsushi Itagaki, Kanagawa, JP;
Masanori Murakami, Kanagawa, JP;
Yoichi Tanabe, Kanagawa, JP;
Toshiaki Tanno, Kanagawa, JP;
Hirokazu Matsuzaki, Kanagawa, JP;
Masaki Yamada, Kanagawa, JP;
Tomonori Kojima, Kanagawa, JP;
Atsushi Itagaki, Kanagawa, JP;
Masanori Murakami, Kanagawa, JP;
Yoichi Tanabe, Kanagawa, JP;
Toshiaki Tanno, Kanagawa, JP;
Hirokazu Matsuzaki, Kanagawa, JP;
Masaki Yamada, Kanagawa, JP;
Fujitsu General Limited, Kanagawa, JP;
Abstract
A magnetic pre-pressurizing section for pre-pressurizing the inner ring of the bearing in the axial direction by a difference of magnetic forces of permanent magnets of the two rotors is arranged. The magnetic pre-pressurizing section is constructed by a difference of a magnetizing amount for forming permanent magnetsarranged in the respective rotors. The magnetic pre-pressurizing section is also constructed by a difference of distances of an air gap Lof a statorand a permanent magnet, and an air gap Lof the statorand a permanent magnet. The magnetic pre-pressurizing section is also constructed by a difference of thicknesses of the rotating axis direction of a permanent magnetand a permanent magnetarranged in the respective rotors.