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. 02, 2020
Filed:
Jun. 17, 2015
Mitsubishi Electric Corporation, Tokyo, JP;
Tomoaki Oikawa, Tokyo, JP;
Mineo Yamamoto, Tokyo, JP;
Hiroyuki Ishii, Tokyo, JP;
Hiroki Aso, Tokyo, JP;
Junichiro Oya, Tokyo, JP;
Yuto Urabe, Tokyo, JP;
Takaya Shimokawa, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A permanent-magnet electric motor includes an annular stator core, a rotor core, and a rotating-position detection sensor. In each of a plurality of magnet insertion holes formed in the rotor core, a rare-earth magnet and a ferrite magnet are disposed adjacent to each other in an axial direction of the rotor core. The rotor core has an axial length longer than an axial length of the stator core. The rare-earth magnet is disposed in each of the magnet insertion holes to be opposed to the stator core in a radial direction of the stator core. The ferrite magnet disposed in each of the magnet insertion holes is disposed between the rare-earth magnet disposed in the corresponding magnet insertion hole and the rotating-position detection sensor.