Provided is a rotation drive apparatus for rotating an upper rotary body of a construction machine, the rotation drive apparatus eliminating, while achieving a fundamental goal of stopping a rotation when an emergency stop operation is performed, wasteful stopping by a parking brake. The apparatus includes: an emergency stop switch (20); a rotation control section (12, 19) which performs control to stop a rotating motor (11) when the emergency stop operation is applied to the emergency stop switch (20); and a timer (21) which activates the parking brake (15) when a set period of time has elapsed after the emergency stop operation is performed. Preferably, the rotation control section (12, 19) detects a failure of an inverter (12) and causes the parking brake (15) to perform a braking operation before the elapse of the set period of time when the failure is detected.
ROTATION DRIVE DEVICE FOR CONSTRUCTION MACHINE
DREHANTRIEBSVORRICHTUNG FÜR EINE BAUMASCHINE
DISPOSITIF D'ENTRAÎNEMENT EN ROTATION POUR ENGIN DE CHANTIER
2018-12-05
Patent
Electronic Resource
English