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:
Jan. 31, 2012
Filed:
Feb. 21, 2007
Hayato Yoshino, Tokyo, JP;
Yoshio Takita, Tokyo, JP;
Koji Yabe, Tokyo, JP;
Takashi Ishigaki, Tokyo, JP;
Koji Masumoto, Tokyo, JP;
Hayato Yoshino, Tokyo, JP;
Yoshio Takita, Tokyo, JP;
Koji Yabe, Tokyo, JP;
Takashi Ishigaki, Tokyo, JP;
Koji Masumoto, Tokyo, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
It is an objective to provide a permanent magnet synchronous motor that is highly efficient with low vibration and low noise. A statorincludes a stator corethat includes magnetic pole teetheach formed between adjacent slots, and stator windingsthat are provided in the slotsof the stator core. A rotorincludes a rotor core, a plurality of magnet retaining holes, permanent magnetsinserted in the magnet retaining holes, and a plurality of slitsin the rotor coreon an outer circumferential side of the magnet retaining holes. Among the slits, slitsin a vicinity of a magnetic pole center of the rotor coreare oriented in a direction where a magnetic flux generated by a permanent magnetconverges outside the rotor core, whereas slitsin a vicinity of a pole border portion of the rotor coreare oriented in another direction that is different from the direction of the plurality of slitsin the vicinity of the magnetic pole center of the rotor core