CONSTRUCTION MACHINERY - HITACHI CONSTRUCTION MACHINERY

Title:

CONSTRUCTION MACHINERY

Document Type and Number:

WIPO Patent Application WO/2012/128133

Kind Code:

A1

Abstract:

Construction machinery equipped with an electric motor system, wherein the electric motor system is provided with: a first insulation resistance deterioration detector (90A) comprising a first voltage waveform generator (100A) and a first detection unit (99A) which is connected to the first voltage waveform generator (100A) and the accumulator device (24) side with respect to a relay (56), and which detects deterioration in insulation resistance on the accumulator device (24) side by measuring changes in the waveform inputted from the first voltage waveform generator (100A); and a second insulation resistance deterioration detector (90B) comprising a second voltage waveform generator (100B) and a second detector (99B) which is connected to the second voltage waveform generator (100B) and the drive system (55) side with respect to a relay (56), and which detects deterioration in insulation resistance on the drive system side by measuring changes in the waveform inputted from the second voltage waveform generator (100B).

Inventors:

EDAMURA MANABU (JP)
HIROKI TAKENORI (JP)
SHIINA MASAYUKI (JP)
SHIBATA KOUICHI (JP)

Application Number:

PCT/JP2012/056485

Publication Date:

September 27, 2012

Filing Date:

March 13, 2012

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)
EDAMURA MANABU (JP)
HIROKI TAKENORI (JP)
SHIINA MASAYUKI (JP)
SHIBATA KOUICHI (JP)

International Classes:

G01R31/02; E02F9/20

Domestic Patent References:

WO2007026603A1

2007-03-08

Foreign References:

JP2009109278A	2009-05-21
JP2005091224A	2005-04-07
JPS5241564A	1977-03-31
JP2010140803A	2010-06-24
JP2001016704A	2001-01-19
JP2009109278A	2009-05-21
JP2007329045A	2007-12-20

Other References: