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:
May. 05, 2026
Filed:
Jul. 11, 2022
Toshiba Mitsubishi-electric Industrial Systems Corporation, Tokyo, JP;
TMEIC CORPORATION, Tokyo, JP;
Abstract
An insulation diagnostic device according to an embodiment performs an insulation diagnosis of a three-phase AC motor on the basis of a U-phase current, a V-phase current, and a W-phase current supplied to the three-phase AC motor, and includes: a current vector calculation module that calculates at least one of a zero sequence current vector or a negative sequence current vector on the basis of the U-phase current, the V-phase current, and the W-phase current; a reference current vector storage unit that stores a reference current vector in advance; a current difference vector calculation module that calculates a current difference vector that is a difference between a current vector calculated by the current vector calculation module and the reference current vector; and a determination module that determines an insulation state of the three-phase AC motor on the basis of the current difference vector.