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. 12, 2011
Filed:
Nov. 05, 2008
Isamu Nitta, Yokohama, JP;
Isamu Nitta, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A permanent magnet motor includes a rotor and a plurality of permanent magnets located inside a rotor core. One or more of the permanent magnets having relatively smaller coercive forces have a first magnetic characteristic that when a magnetizing magnetic field is caused to act on the permanent magnets, a magnetic susceptibility is substantially at 0 until reaching an inflection point during magnetization, and when exceeding the inflection point, the magnetic susceptibility enters a loop approximating to the hysteresis loop in a first quadrant, and a second magnetic characteristic that when a demagnetizing magnetic field is caused to act on the permanent magnets, a magnetic susceptibility is substantially at 0 until reaching the inflection point during demagnetization, and when exceeding the inflection point, the magnetic susceptibility enters a loop approximating to the hysteresis loop in a second quadrant.