본 발명은 건설 기계에 탑재된 축전 장치에 의해 제한되는 가동 시간을, 전동ㆍ발전기에 의한 발전 작용에 의해 종래보다도 길게 할 수 있는 건설 기계의 전동 구동 장치를 제공하는 것이다. 축전 장치(7)와, 전동ㆍ발전기(29)에 의해 구동하는 고정 용량형의 유압 펌프(30)와, 유압 펌프(30)로부터 복수의 유압 액추에이터로 공급하는 압유의 흐름을 각각 제어하는 복수의 방향 전환 밸브(33, 34) 등과, 전동ㆍ발전기(29)의 회전수를 가변 제어하는 쌍방향 컨버터(28)와, LS 차압 Pls가 목표값 Pgr로 되도록, 쌍방향 컨버터(28)를 제어하는 LS 제어 장치(45)를 구비한다. 쌍방향 컨버터(28)는 LS 차압 Pls가 목표값 Pgr을 상회하여 전동ㆍ발전기(29)의 회전수를 감소시킬 때에, 전동ㆍ발전기(29)의 회전자의 관성력을 전력으로 변환하여 축전 장치(7)를 충전하는 회생 제어를 행한다.

    Provided is an electric drive unit for a construction machine capable of increasing the operating time of the construction machine (which is limited by the electricity storage device mounted on the construction machine) from the currently possible operating time by use of the power generation operation of the motor/generator. The electric drive unit comprises an electricity storage device 7, a hydraulic pump 30 of the fixed displacement type which is driven by a motor/generator 29, a plurality of directional control valves 33, 34, etc. which respectively control the flow of hydraulic fluid supplied from the hydraulic pump 30 to a plurality of hydraulic actuators, a bidirectional converter 28 which performs variable control on the revolution speed of the motor/generator 29, and an LS control device 45 which controls the bidirectional converter 28 so that LS differential pressure Pls equals a target value Pgr. The bidirectional converter 28 performs regeneration control for converting the inertial force of the rotor of the motor/generator 29 into electric power and thereby charging the electricity storage device 7 when the revolution speed of the motor/generator 29 is decreased in response to an excess of the LS differential pressure Pls over the target value Pgr.


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    Title :

    ELECTRIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE


    Additional title:

    건설 기계의 전동 구동 장치


    Publication date :

    2018-08-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / E02F Baggern , DREDGING



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