OPERATIONAL METHOD AND OPERATIONAL CONTROL SYSTEM OF HYDRAULIC MOTOR, FLUID PRESSURE GEAR TRANSMISSION, AND RENEWABLE ENERGY TYPE POWER GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide an operational method of a hydraulic motor capable of reducing the possibility of component breakage in the hydraulic motor.SOLUTION: An operational method of a hydraulic motor having a rotary shaft, a cylinder, a piston forming an operation chamber together with the cylinder, and a high pressure valve/a low pressure valve which switch the communication state of a high pressure line and a low pressure line with the operation chamber in association with reciprocation of the piston, comprises the steps of: detecting the abnormality of the hydraulic motor; and stopping the hydraulic motor when the abnormality is detected. In the stopping step, at least until the rotation speed of the rotary shaft decreases to the specified rotation speed lower than the rating rotation speed, the pressure of the high pressure line is maintained within a specified range between an upper limit Pmax or lower which is smaller than the rating pressure of the high pressure line and a lower limit Pmin or higher which is larger than zero.SELECTED DRAWING: Figure 5