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:
Dec. 21, 2010
Filed:
May. 16, 2008
Yutaka Hashiba, Kanagawa, JP;
Norio Takahashi, Kanagawa, JP;
Masayuki Ichimonji, Tokyo, JP;
Hitoshi Katayama, Kanagawa, JP;
Takaharu Tani, Kanagawa, JP;
Tatsuo Taniguchi, Tokyo, JP;
Masayuki Takahashi, Kanagawa, JP;
Yutaka Hashiba, Kanagawa, JP;
Norio Takahashi, Kanagawa, JP;
Masayuki Ichimonji, Tokyo, JP;
Hitoshi Katayama, Kanagawa, JP;
Takaharu Tani, Kanagawa, JP;
Tatsuo Taniguchi, Tokyo, JP;
Masayuki Takahashi, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A diagnosis device for diagnosing loosening of a stator core of a rotary electrical machine. The diagnosis device has: excitation means for vibrating the stator core in the radial direction; vibration detection means for detecting the vibration of the stator core in the radial direction; means for frequency-analyzing an output signal of the vibration detection means that detects vibration generated in the stator core when the stator core is vibrated by the excitation means so as to extract a measurement natural vibration mode of the stator core in a circular ring natural vibration mode; means for estimating a circular ring natural vibration mode of the stator core from shape data of the stator core; and means for determining a clamping state of the stator core by comparing the measurement natural vibration mode and a determination criterion obtained based on the estimated natural vibration mode.