ROTATION BRAKE METHOD AND DEVICE FOR WORKING MACHINE

摘要

[Object] To stop, in an emergency, a revolving superstructure quickly from rotating while preventing damage of a mechanical brake. [Solution] Drivingly swiveling a revolving superstructure using a permanent magnetic-type swiveling electric motor 17; in an emergency, such as a malfunction in a drive or control system for the swiveling electric motor 17, allowing electric power generated in the electric motor 17 due to inertial rotation to be consumed in an external braking resistor 24 so as to make an electric braking action; and activating a mechanical brake 21 to stop the rotation and hold the stopped revolving superstructure when a rotation speed of the revolving superstructure becomes equal to or lower than a preset value.