Rotation control device, rotation control method, and construction machine

摘要

In an electrically rotated shovel (construction machine), to stop a rotating body (4), a control system changing means (150) provided in a rotation control device (100) switches a control rule from speed control to position control at the time point at which a target speed is determined to be lower than a speed threshold value. Switching to the position control enables braking torque greater than that in the speed control to be outputted to an electric motor (5), and as a result, the rotating body (4) can be reliably maintained stationary.