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HYDRAULIC DRIVE DEVICE FOR ELECTRIC HYDRAULIC WORK MACHINE
A hydraulic drive system for an electrically-driven hydraulic work machine makes it possible to make a rated voltage of various electric equipment such as power storage devices common to one of an electrically-driven hydraulic work machine that is capable of being operated with lower horsepower and to prevent that only a power storage situation of one of the plurality of power storage devices significantly degrades together with operation of the electrically-driven hydraulic work machine and besides, to extend a time period within which each of actuators of the electrically-driven hydraulic work machine can obtain a predetermined speed. Accordingly, a controller 50 includes a virtual limitation torque calculation section 51 and electric motor rotational speed control sections 52 and 53. Variable horsepower control tables 52r and 53r are provided in the electric motor rotational speed control sections 52 and 53, and limit values q1*limit and q2*limit for a virtual displacement of the variable horsepower control tables 52r and 53r are changed such that a charge state of a power storage device 170 and a charge state of another power storage device 270 become equal to each other.
HYDRAULIC DRIVE DEVICE FOR ELECTRIC HYDRAULIC WORK MACHINE
A hydraulic drive system for an electrically-driven hydraulic work machine makes it possible to make a rated voltage of various electric equipment such as power storage devices common to one of an electrically-driven hydraulic work machine that is capable of being operated with lower horsepower and to prevent that only a power storage situation of one of the plurality of power storage devices significantly degrades together with operation of the electrically-driven hydraulic work machine and besides, to extend a time period within which each of actuators of the electrically-driven hydraulic work machine can obtain a predetermined speed. Accordingly, a controller 50 includes a virtual limitation torque calculation section 51 and electric motor rotational speed control sections 52 and 53. Variable horsepower control tables 52r and 53r are provided in the electric motor rotational speed control sections 52 and 53, and limit values q1*limit and q2*limit for a virtual displacement of the variable horsepower control tables 52r and 53r are changed such that a charge state of a power storage device 170 and a charge state of another power storage device 270 become equal to each other.
HYDRAULIC DRIVE DEVICE FOR ELECTRIC HYDRAULIC WORK MACHINE
HYDRAULISCHE ANTRIEBSVORRICHTUNG FÜR EINE ELEKTROHYDRAULISCHE ARBEITSMASCHINE
DISPOSITIF D'ENTRAÎNEMENT HYDRAULIQUE POUR MACHINE DE TRAVAIL HYDRAULIQUE ÉLECTRIQUE
TAKAHASHI KIWAMU (author) / TAKISHITA TATSUO (author) / YUNOUE MASAYUKI (author) / NAKATANI KENICHIROU (author) / MAEHARA TAIHEI (author)
2019-05-29
Patent
Electronic Resource
English
HYDRAULIC DRIVE DEVICE FOR ELECTRIC HYDRAULIC WORK MACHINE
| European Patent Office | 2018