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. 16, 2007
Filed:
Jul. 28, 2004
Toshihiko Futami, Fuji, JP;
Toshihiko Futami, Fuji, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A permanent magnet motor has permanent-magnet-holding slotsformed in those parts of a rotor coreA which correspond to sides of an approximately regular polygon centered on an axis of the rotor coreA, permanent magnetsinserted in the respective permanent-magnet-holding slots, and four or more radially elongated slitsarranged apart from each other along each of the permanent-magnet-holding slots on an outer core outside the permanent-magnet-holding slots, characterized in that at a radially outer end, the slits are spaced approximately equally while at a radially inner end, spacing between the slits is reduced with increasing distance from a center of each permanent magnet, with the spacing at the center being the largest.