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Patent Searching and Data


Title:
ELECTROMOTIVE DRIVE DEVICE OF CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2012/144428
Kind Code:
A1
Abstract:
Provided is an electromotive drive device that is of a construction machine and that is capable of lengthening operation time. The electromotive drive device of an electric mini shovel is provided with: an electricity storage device (7); a motor generator (27) that sends/receives power to/from the electricity storage device (7); a hydraulic pump (29) driven by the motor generator (27); a plurality of direction switching valves (32, 34) that respectively control the flow of hydraulic oil from the hydraulic pump (29) to a plurality of hydraulic actuators (13A, 19); and a plurality of operation devices (31, 33) that respectively operate the plurality of direction switching valves (32, 34). A bidirectional converter (28) is provided that decelerates the motor generator (27) to an idling rotational frequency when X seconds have elapsed with the plurality of direction switching valves (32, 34) all being in an un-operated stated. The bidirectional converter (28) performs regeneration control that converts the inertial force of the rotor of the motor generator (27) to electrical power and charges the electricity storage device (7) when decelerating the motor generator (27) from a standard rotational frequency to an idling rotational frequency.

Inventors:
KURIKUMA HAJIME (JP)
TAKISHITA TATSUO (JP)
NAKAMURA YUTA (JP)
Application Number:
PCT/JP2012/060083
Publication Date:
October 26, 2012
Filing Date:
April 12, 2012
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
KURIKUMA HAJIME (JP)
TAKISHITA TATSUO (JP)
NAKAMURA YUTA (JP)
International Classes:
E02F9/20; F15B11/00
Foreign References:
JP2011078277A2011-04-14
JP2010121328A2010-06-03
JP2001012418A2001-01-16
JP2000273913A2000-10-03
JP2010121328A2010-06-03
Other References:
See also references of EP 2700755A4
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
Download PDF:
Claims: