Air sampler with compensating pump motor speed
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United States of America Patent
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May 25, 2004
Grant Date -
N/A
app pub date -
May 15, 2002
filing date -
May 15, 2002
priority date (Note) -
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Abstract
A constant flow of air through a personal air sampler is provided regardless of changes in the air flow path, by altering the pump speed as a function of the power taken by the pump. The characteristics of the pump are precalibrated to provide a constant used together with the square of the voltage appearing across the motor armature coils (applied voltage minus back Emf), which reflects the power currently used, to adjust the motor speed and thus provide a constant flow of air under changing conditions of resistance.
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