Kobelco Construction Machinery Co., Ltd.

Masayuki Kogashima

Masayuki Komiyama

Natsuki Yumoto

Yoshiyasu Umezu

There is provided a slewing control device that enables to detect breakdown of a driving system of a mechanical brake, and generate a torque for holding a slewing body in a stopped state to thereby prevent movement of the slewing body when an anomaly has occurred. In a working machine for driving a slewing body by an electric motor, judgment is made as to whether a mechanical brakeis in an inconsistent state, based on a command to be outputted to a brake circuit B, and a pressure detected by a brake pressure sensor. The inconsistent state is a state that the mechanical brakeis in a brake released state when an activation command for switching the mechanical braketo a brake activated state is outputted. If it is judged that the mechanical brakeis in the inconsistent state, a command for obtaining a braking torque for holding the slewing body in a stopped state is outputted to the electric motor

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Hiroshima, Japan

Masayuki Kogashima