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:
May. 09, 2006
Filed:
Apr. 01, 2004
Toshifumi Tsuruta, Nagano, JP;
Hideki Kanebako, Nagano, JP;
Noboru Otsuki, Nagano, JP;
Dongning Zhang, Nagano, JP;
Toshifumi Tsuruta, Nagano, JP;
Hideki Kanebako, Nagano, JP;
Noboru Otsuki, Nagano, JP;
Dongning Zhang, Nagano, JP;
NIDEC Sankyo Corporation, Nagano, JP;
Abstract
A permanent magnet embedded motor including a rotor which is provided with a plurality of slits and a plurality of permanent magnets embedded into the slits and a stator which is provided with an iron core having a plurality of slots to which a coil is wound and is arranged to face the rotor via a gap. The slit includes a permanent magnet embedded part into which the permanent magnet is embedded in a direction perpendicular to the radial direction of the rotor and an 'L'-shaped air gap part integrally provided on both ends of the permanent magnet embedded part. An angle 'θ' for one pole of the rotor and an angle “θ” of the “L”-shaped air gap part are set to be 0.1≦θ≦0.3. Further, a radius “R” of a circumscribed circle of the rotor and a radius “R” for forming an outer peripheral face of the rotor at a portion of the “L”-shaped air gap part are preferably set to be 0.1≦(R−R)/R≦0.3.