| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic device such as a hydraulic power system operating an operating part used in a clamp of a machine tool, for quickly switching the number of revolution of a motor to be a high speed. SOLUTION: The hydraulic device 20 comprises: an electronic circuit 23 for a motor control for controlling a rotation speed of a liquid pump 21 supplying pressure liquid to the operating part 29; and a solenoid valve 28 disposed to a discharge line or the like of the liquid pump 21 extending to the operating part 29 and switching the direction of a passage by a control command A from a main controller 27. A sensor 26 is connected to be capable of receiving discharge pressure P with respect to the discharge line or the like of the liquid pump 21 positioned upstream the solenoid valve 28 so that the sensor 26 sends a detection signal B to the electronic circuit 23 for a motor control. An electronic circuit 30 is disposed between the electronic circuit 23 for a motor control and the sensor 26 so as to transmit a switch signal C generated by a control signal A from the main controller 27 and the detection signal B from the sensor 26 to a motor controller 25. COPYRIGHT: (C)2006,JPO&NCIPI
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