Title:
ELECTRIC WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2023/189343
Kind Code:
A1
Abstract:
An electric work machine (1) comprises: a battery unit (30); an electric motor (9); an inverter (38) that supplies power from the battery unit to the electric motor and drives the electric motor; hydraulic pumps (P1, P2) that are actuated by the motive power of the electric motor; a hydraulic device that is actuated by the hydraulic pressure of hydraulic oil discharged from the hydraulic pumps; an oil temperature detection device (44) for detecting the temperature of the hydraulic oil; a rotation speed detection device (42) for detecting the rotation speed of the electric motor; and a control device (7) that controls driving of the inverter and the electric motor. The control device gradually increases the rotation speed of the electric motor and sets the rotation speed to a target rotation speed so that the time until the rotation speed of the electric motor reaches the target rotation speed when the electric motor is started while the temperature of the hydraulic oil detected by the oil temperature detection device is equal to or less than a predetermined temperature is longer than when the electric motor is started while the temperature of the hydraulic oil is higher than the predetermined temperature.
Inventors:
SAI TAKUMA (JP)
MATSUI KIYOSHI (JP)
ITO JUNKI (JP)
MATSUI KIYOSHI (JP)
ITO JUNKI (JP)
Application Number:
PCT/JP2023/008994
Publication Date:
October 05, 2023
Filing Date:
March 09, 2023
Export Citation:
Assignee:
KUBOTA KK (JP)
International Classes:
E02F9/20; F15B20/00
Domestic Patent References:
| WO2013111613A1 | 2013-08-01 |
Foreign References:
| JP2017227202A | 2017-12-28 | |||
| JP2020039239A | 2020-03-12 | |||
| JP2004350443A | 2004-12-09 | |||
| JP2018087496A | 2018-06-07 | |||
| JP2018105081A | 2018-07-05 | |||
| JP2019056236A | 2019-04-11 |
Attorney, Agent or Firm:
YASUDA & OKAMOTO IP LAW FIRM (JP)
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