Fire-extinguishing system with servo motor-driven foam pump
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United States of America Patent
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Oct 30, 2012
Grant Date -
Mar 10, 2011
app pub date -
Sep 8, 2009
filing date -
Sep 8, 2009
priority date (Note) -
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Abstract
Embodiments of the invention provide a fire-extinguishing system for injecting foamant into a stream of water. The system can include a flow meter determining a flow rate of the stream of water and a foam pump having an inlet coupled to a supply of foamant and an outlet coupled to the stream of water. The system includes a servo motor driving the foam pump. The servo motor includes a sensor used to determine a rotor shaft speed and/or a rotor shaft torque. A controller can control an operating speed of the servo motor using closed-loop control depending on the flow rate and the rotor shaft speed and/or the rotor shaft torque.
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