Motors: expansible chamber type – Working member position feedback to motive fluid control – With means to vary feedback signal in response to rate of...
Patent
1987-07-08
1988-08-16
Scott, Samuel
Motors: expansible chamber type
Working member position feedback to motive fluid control
With means to vary feedback signal in response to rate of...
91 6, 91361, 91403, 91459, F15B 1316
Patent
active
047635606
ABSTRACT:
Method and apparatus of controlling and positioning a fluid actuator by supplying pressurized fluid to right and left actuating chambers of the actuator through an on-off control valves. To drive and position the actuator rapidly and accurately, the actuator can be driven at a higher speed by an initial driving force until it reaches near the desired position and continuously moved at a low speed by gradually increasing the fluid pressure to be supplied to the right and left actuating chambers of the actuator. The initial driving force in the high-speed range becomes maximum when the pressure is applied to one of the right and left actuating chambers while at the same time the other actuating chamber is exhausted. In the low-speed range and near the target position, the one actuating chamber is continuously supplied with the pressure while at the same time the other actuating chamber is gradually closed. Thus, the speed of movement of the actuator can be reduced in the low-speed range and ultimately stopped by raised pressures acting on the opposite sides of the actuator. At the target position, accordingly, the actuator can accurately be positioned against any external disturbance.
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Kamen Noah
Scott Samuel
Tokyo Precision Instruments Co., Ltd.
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