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. 18, 2021
Filed:
Jul. 31, 2015
Nissan Motor Co., Ltd., Yokohama, JP;
Wisconsin Alumni Research Foundation;
Kensuke Sasaki, Kanagawa, JP;
Takashi Fukushige, Kanagawa, JP;
Takashi Katou, Kanagawa, JP;
Apoorva Athavale, Madison, WI (US);
Robert D. Lorenz, Madison, WI (US);
Nissan Motor Co., Ltd., Yokohama, JP;
Wisconsin Alumni Research Foundation, Madison, WI (US);
Abstract
A permanent magnet synchronous motor includes a stator, a rotor rotatable relative to the stator, and a magnetic structure with a low coercive force magnet and a high coercive force magnet that are arranged magnetically in series with respect to each other to define a pole-pair of the permanent magnet synchronous motor. A magnetization level of the low coercive force magnet is changeable by a stator current pulse such that a stator magnetomotive force at a rated current is equal to or larger than a product of a magnetic field strength for fully magnetizing the low coercive force magnet and a thickness of the low coercive force magnet.