Calibration technique for variable speed motors
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United States of America Patent
Stats
-
Aug 22, 1989
Issued Date -
N/A
app pub date -
Jan 13, 1988
filing date -
Dec 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable speed motor is regulated responsive to the load torque acting on the blower wheel. The load torque acting on the blower wheel is determined by means of a coast down procedure in which the motor is briefly de-energized and the rate of angular change d.omega./dt is determined. The load torque acting on the blower wheel can be determined knowing the moment of inertia and d.omega./dt. The average motor RPM during the coast down is then related to a torque value where an RPM vs. CFM relationship has been empirically determined for that blower wheel. A microprocessor then computes the final motor RPM necessary to achieve the desired air delivery (CFM) using the fan law equations.
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Cited Art Landscape
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