Flow control actuator
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United States of America Patent
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May 30, 2017
Issued Date -
N/A
app pub date -
Apr 5, 2011
filing date -
Apr 5, 2011
priority date (Note) -
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Abstract
An actuator (1′) for driving a regulating element (30) for controlling a fluid flow in a flow channel (29) includes an electric motor (4) for driving the regulating element (30) and a control unit (2) for controlling a current provided to the electric motor (4). A resistive element (3) including a resistor (5) and a NTC thermistor (6) connected in parallel across the resistor (5) is positioned in a current path from the control unit (2) to the motor (4). Accordingly, when the ambient temperature increases, the decreasing resistance of the resistive element (3) counterbalances the increasing resistance of the motor windings, resulting in a less varying current from the control unit (2) to the motor (4) and therewith in a less varying output torque of the motor (4).
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