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. 30, 2001
Filed:
Dec. 15, 1998
Isamu Nitta, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A permanent magnet motor includes a rotor having a permanent magnet and a stator core having circumferential teeth the number of which is 2n where n is an integer equal to or larger than 2, the teeth including first teeth the number of which is n and second teeth the number of which is n, the first and second teeth being circumferentially regularly disposed alternately. Each first tooth has a head with an end face opposed to the rotor and formed generally into the shape of an arc about a center of rotation of the rotor so that an air gap defined between said end face and a surface of the rotor opposed to said end face is circumferentially uniform. Each second tooth has a head with an end face opposed to the rotor and shaped so as to be gradually departed farther away from an opposite surface of the rotor as the head extends from its circumferentially central portion toward both circumferential ends.