Motor Load vs HP vs Current

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[original post is likely clipped to save bandwidth] On Sat, 24 Jul 2010 09:18:14 -0700 (PDT), Bobby Joe

Is this a motor problem or a supply problem? A 9A load should not sag your mains such that other equipment (net) fails.
Did you measure RMS current? Peak (common) are misleading.
What was the voltage at the motor and at your mains? Low voltage can cause high currents. In computer electronics, peak voltage is usually more important than RMS.
gerry

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http://www.grainger.com/Grainger/AO-SMITH-Direct-Drive-Blower-Motor-4KA36?Pid=search
http://www.grainger.com/Grainger/DAYTON-Direct-Drive-Blower-Motor-4M183?Pid=search
http://www.grainger.com/Grainger/DAYTON-Direct-Drive-Blower-Motor-3LU91?Pid=search
Check to make *sure* that you have not got any air flow restriction issues...... excessively restrictive filter, registers closed, dirty evap coil, insulation that came loose inside the plenum, etc.
BTW... when you did the amp draw and rpm measurements, did you have the cover off the blower compartment??
Gotta love it when an EE plays with stuff. :-)
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