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:
Jul. 31, 2007
Filed:
Nov. 23, 2005
Isamu Nitta, Yokohama, JP;
Minoru Awazu, Yokohama, JP;
Isamu Nitta, Yokohama, JP;
Minoru Awazu, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A permanent magnet motor includes a rotor core having magnetic pole faces including first to third faces. The first face is formed on a peripherally central part and has a peripherally uniform width of the gap. Each of the second and third faces is formed on both peripheral ends respectively and has a width of a gap rendered larger as each of the second and third faces comes close to a boundary between magnetic poles. The first face ranges from ±15 degrees to ±35 degrees in electrical angle about a center of the magnetic pole and has such a circular arc shape that the gap width is increased by about 10% relative to a minimum gap width.