| 摘要 |
Output of a fluid supply unit in a fluid circuit associated with a machine tool is controlled by operating a pump motor at a constant speed, maximum in the preferred form of the invention, during the entire fluid supply operation and varying the connection between the motor and a pump to vary the flow conditions, such as flow rate, pressure or the like of fluid being supplied. Pump output is directly related to the degree of coupling in one form of the invention. Accuracy of fluid output response is improved over prior art systems by locating a flow characteristic sensor immediately adjacent to the output of the pump and controlling volume adjacent to the pump output and the flow characteristic sensor so changes in flow conditions are rapidly located adjacent to the flow characteristic sensor.
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