Patent ID: 8511490

Claim:
A slewing stop control apparatus which is provided to a slewing type working machine including a slewing structure and a slewing motor for rotating the slewing structure to control a stop motion of a slewing of the slewing structure so as to stop the slewing structure at a predetermined slewing stop angular position, the slewing stop control apparatus comprising: a slewing motion detector which detects an actual slewing angular position and an actual slewing angular velocity of the slewing structure; a braking start timing decision portion which decides a braking start timing at which a braking of the slewing of the slewing structure should be started to stop the slewing structure at the slewing stop angular position at a pre-determined slewing deceleration, based on the actual slewing angular velocity of the slewing structure and a remaining slewing angle from the actual slewing angular position of the slewing structure up to the slewing stop angular position; a target slewing angular velocity determination portion which determines a target slewing angular velocity corresponding to the remaining slewing angle to generate the slewing deceleration; a slewing angular velocity adjusting portion which adjusts the slewing angular velocity to generate the target slewing angular velocity from the braking start timing; an operation member which is operated to restart the slewing of the slewing structure having been stopped at a position before the slewing stop angular position so as to move the slewing structure toward the slewing stop angular position; and a target slewing angular velocity correcting portion which corrects the target slewing angular velocity determined by the target slewing angular velocity determining portion, upon the operation of the operation member, so as to increase the target slewing angular velocity, wherein the target slewing angular velocity correction portion performs the correction by determining a correction amount to be added to the target slewing angular velocity determined based on the remaining slewing angle and adding the correction amount to the target slewing angular velocity.