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. 08, 2014
Filed:
Oct. 13, 2011
Masanori Sawahata, Hitachi, JP;
Mamoru Kimura, Hitachinaka, JP;
Satoshi Kikuchi, Tokai, JP;
Akiyoshi Komura, Hitachi, JP;
Masanori Sawahata, Hitachi, JP;
Mamoru Kimura, Hitachinaka, JP;
Satoshi Kikuchi, Tokai, JP;
Akiyoshi Komura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A rotor slot is asymmetrically shaped with respect to a straight line drawn from the central axis of the rotation of the rotor in a radial direction, and has a slot opening, the circumferential width of which is smaller than that of the rotor slot, at the top of the rotor slot, so that a loss generated in the rotor due to a carrier harmonic component can be reduced and the power factor can be improved, enabling a current generated in an armature winding to be suppressed and thereby improving efficiency in a rated operation.