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:
Jul. 17, 2018
Filed:
Apr. 26, 2011
Koji Obata, Tokyo, JP;
Koji Obata, Tokyo, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka-Shi, JP;
Abstract
A phase-to-phase insulation partial discharge inspection apparatus includes: an impulse power supply () configured to apply an impulse voltage having a voltage rise time period tr which satisfies an expression 'tr>(τ·V)/(PDIV)' to a rotary electric machine (); a measurement section () configured to measure partial discharge which occurs when the impulse voltage is applied to the rotary electric machine (); and a decision section () configured to determine that, when partial discharge is not measured by the measurement section (), a phase-to-phase insulation performance is acceptable. In the expression, τis a surge propagation time period of one coil of a rotary electric machine winding, PDIV a partial discharge inception voltage between winding turns, and Va peak of a partial discharge testing voltage for the phase-to-phase insulation.