| 主权项 |
1. A construction machine, comprising:
a lower-part traveling body; an upper-part turning body mounted on the lower-part traveling body through a turning mechanism configured to turn the upper-part turning body horizontally relative to the lower-part traveling body; a turning electric motor configured to drive the turning mechanism; and a control unit configured to control driving of the turning electric motor, wherein the control unit includes
a processor; anda memory storing a program that, when executed by the processor, causes the control unit to cause an output torque of the turning electric motor to selectively continue after a turning speed of the upper-part turning body becomes zero, based on a direction in which the upper-part turning body has turned, and a magnitude of the output torque or a direction of the output torque of the turning electric motor, when the turning speed of the upper-part turning body becomes zero because of deceleration of the upper-part turning body, wherein the control unit causes the output torque of the turning electric motor to be zero or reduced when an absolute value of the output torque of the turning electric motor, when the turning speed of the upper-part turning body becomes zero, is less than a predetermined value, in a case where a turn of the upper-part turning body is stopped with the construction machine being placed on level ground or in a case where an upward turn of the upper-part turning body is quickly stopped with the construction machine being placed on a slope. |
