Hydraulic driving device for electric hydraulic working machine

摘要

Problem: by controlling the number of revolutions of a motor that drives a hydraulic pump for supplying pressure oil to a plurality of actuatorsIn a hydraulic drive device of an electric hydraulic working machine for controlling the flow rate of a hydraulic pumpAccording to the magnitude of the load power that the hydraulic pump consumesBy optimally adjusting the amount of rotation of the motorWithout deteriorating the responsiveness of the motor any more than necessaryThe power consumed by the motor is reliably limited within a predetermined maximum allowable power.The controller 50 has a maximum angular acceleration limiting portion (allowable rate calculating part 50N and rate limiting portion 50J);The main pump 2 calculates the hydraulic power consumed by the main pumpThe maximum angular acceleration permitted by the motor 1 is calculated based on the magnitude of the hydraulic power and the maximum allowable power that the preset electric motor 1 can consumeThe angular acceleration of the motor 1 is restricted so that the angular acceleration of the motor 1 does not exceed the maximum angular acceleration.Diagram