B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
32/3, 117/61
B05B 12/08 (2006.01) B67D 7/08 (2010.01) G05D 7/06 (2006.01)
Patent
CA 1292153
APPARATUS AND METHOD FOR DISPENSING FLUID MATERIALS USING POSITION-DEPENDENT VELOCITY FEEDBACK Abstract of the Disclosure Apparatus and method for dispensing fluid materials wherein the fluid is discharged from a nozzle at a rate controlled by a metering valve having a seat and a stem moveable with respect to the seat to modulate the flow. A servo-actuator connected in a feedback control loop is used to position the valve stem with respect to its seat in accordance with a control signal. The control signal is derived in accordance with the difference between a driving signal representing a desired flow rate and the sum of a pair of feedback signals. One feedback signal represents the actual flow rate while the other is correlated to both the relative velocity and position of the stem with respect to the seat. The position- dependent velocity signal is generated by a transducer comprising a magnet and a coil influencable by the field of the magnet as the magnet and coil move relative one another. The magnet moves with the valve stem while the coil is fixed with respect to the valve seat. The magnitude of the position-dependent velocity signal is zero when there is no relative movement between the stem and seat and increases with increasing velocity and its polarity is such as to always oppose such relative movement. For any given velocity, the magnitude of the position-dependent velocity signal is greater when the stem and seat are close together than when they are further apart so that as the valve closes, the amount of feedback increases. This permits operation at significantly higher loop gain without risk of instability over the full range of the valve. The valve is more sensitive and the system is less stable when nearly closed than when more fully open. By relating the amount of feedback to the position of the valve, stability is insured when the valve is more closed without unduly limiting response time when the valve operates more slowly and/or at more fully open positions.
558073
Corporation Nordson
Macrae & Co.
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