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:
Aug. 04, 2015
Filed:
Sep. 14, 2012
Koji Obata, Hitachi, JP;
Yutaka Higashimura, Hitachi, JP;
Keiji Suzuki, Hitachi, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
With a rotating electric machine testing method for applying a test voltage to an armature winding of the rotating electric machine to thereby test insulation performance of the armature winding, in the case where a rated voltage of the armature winding of the rotating electric machine is E, and an insulation test voltage of an armature winding of a sine wave voltage drive rotating electric machine at the rated voltage E is E/√{square root over (3)} or E, a test voltage Vapplied to an armature winding of the inverter drive rotating electric machine is set to V=α·E/√{square root over (3)} or V'=α·E, respectively, provided that α(=t/t), if the insulation thicknesses of the sine wave drive rotating electric machine is tand of the inverter drive rotating electric machine is t, thereby conducting a test on any of the AC voltage-current characteristic, AC tan δ, and AC partial-discharge characteristics.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile