ROTARY WORK MACHINE

摘要

A slewing-type working machine includes: a slewing motor 11 which is a hydraulic motor for slewing; a variable-displacement hydraulic pump 10; a slewing operation device 12 including an operation member 12a; a control valve 13 controlling the slewing motor 11 based on an operation signal thereof; a pump regulator 25; a relief valve 27 letting excess fluid to a tank T; operation detectors 28, 29 detecting an operation direction and amount of the operation member 12a; a motor rotational speed detector 30; and a controller 26 controlling a discharge flow rate of the hydraulic pump 10. The controller 26 obtains a deviation between a target rotational speed of the slewing motor 11 obtained from a slewing operation amount and an actual rotational speed detected by the motor rotational speed detector 30, and controls the discharge flow rate to make the deviation closer to 0.