Airflow blockage detection apparatus for a permanent...

Details Airflow blockage detection apparatus for a permanent... Airflow blockage detection apparatus for a permanent...

2005-09-27

2005-09-27

Goins, Davetta W. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S501000, C340S608000, C340S648000, C340S664000, C318S078000, C318S613000, C361S031000

Reexamination Certificate

active

06950029

ABSTRACT:
An airflow blockage detection apparatus for a permanent split-capacitor single-phase cooling fan motor measures and compares electrical currents in main and auxiliary windings of the motor to detect airflow blockage. Main and auxiliary current sensors detect AC currents in the main and auxiliary windings, respectively, and a blockage detection circuit forms a difference between the detected currents. An airflow blockage alarm is activated when the current difference exceeds a specified setpoint indicative of abnormally low airflow.

REFERENCES:
patent: 5478379 (1995-12-01), Bevins
patent: 5831525 (1998-11-01), Harvey
patent: 6545438 (2003-04-01), Mays, II

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