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:
Nov. 16, 2010
Filed:
Apr. 20, 2007
Yasuyuki Shibui, Tokyo, JP;
Masahiro Shimizu, Tokyo, JP;
Yasuyuki Shibui, Tokyo, JP;
Masahiro Shimizu, Tokyo, JP;
IHI Corporation, Tokyo, JP;
Abstract
A motor rotor () includes a motor shaft (), a permanent magnet () surrounding the motor shaft () around an axis, a pair of end rings () surrounding the motor shaft () around the axis and sandwiching the permanent magnet () from both sides in an axial direction, and a hollow cylindrical outer sleeve () fitted to the permanent magnet () and a pair of end rings () in accordance with a stationary fit. A longitudinal elastic modulus of the end ring () is larger than a longitudinal elastic modulus of the permanent magnet (). A thickness of the outer sleeve () is different in correspondence to a position in the axial direction in such a manner as to make uniform a circumferential stress applied to the outer sleeve () fitted to the permanent magnet () and a pair of end rings () in the axial direction.