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:
Sep. 12, 2017
Filed:
Feb. 11, 2016
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An anomaly diagnosis system is provided that includes: a current-value obtaining partthat obtains a value of an AC current inputted to or outputted from a device to be diagnosed; a frequency analyzing partthat converts the current values obtained at intervals into a frequency spectrum which correlates a current intensity with a frequency; an anomaly-judging-value calculating partthat calculates at intervals a frequency width of the frequency spectrum at a current intensity 'As' satisfying As=m×At (0<m<1), where 'At' is a peak current intensity associated with an analysis frequency which is an integer multiple of a frequency of the AC current; and a judging partthat judges whether the frequency width is wider than that in a normal condition and, if it holds true, judges that the device is in an anomalous condition.