HYDRAULIC MACHINE AND METHOD FOR CONTROLLING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic machine capable of improving both accuracy of driving control and driving speed of a ring gate.SOLUTION: A hydraulic machine includes a ring gate installed between a stay vane installed on an inner peripheral side of a casing where water flows in and a guide vane installed on the inner peripheral side of the stay vane. The machine is also provided with one or more hydraulic servomotors which drive the ring gate, and a pressure oil device which supplies pressure oil to the hydraulic servomotors and recovers the pressure oil discharged from the hydraulic servomotors. The machine is also provided with one or more first valves with a first rated flow which switch supplying and discharging of oil to and from the hydraulic servomotor and one or more second valves with a second rated flow that is the same or lower than the first rated flow which switch supplying and discharging of oil to and from the hydraulic servomotor. The machine is also provided with a control device which controls the first and the second valves.