Motor Load vs HP vs Current

Bobby Joe · 2010-07-24T16:18:14+00:00

If I have a motor that is being overloaded ~2x it's rated willdoubling the HP improve this?I have a 1/2HP Direct drive 1P, 120V, 1075RPM blower motor that isdrawing 12A while it is rated at 6.5A Full load, 9A max and onlyspinning at about 700RPM. [No load it draws 3A]The problem I was having is any time the AC kicked in I would loseconnection to the net and the power would sag. I went to the attic andmeasured the AC and found it was drawing 2x the rated current at fullload. I thought the motor was bad so I got an identical replacementbut almost exactly the same measured specs and same problem.I figured I could replace it with a 3/4 or 1HP motor and get betterresults but I'm not sure how much. I want to save power and possiblyincrease the rpm's,The main thing I would like to know is how HP, current, and load arerelated. If I double the HP I should effectively be doubling the maxload and probably the current at max load? Basically, if I have an xHP motor using a certain load and I move to y HP motor then what can Iexpect the RPM's and current to be? [simple estimates are ok. Iunderstand that it depends on a lot of factors but there should begeneral principles involved]As I said, I would like to be able to determine if a 1HP iseffectively going to allow me to increase the RPM's and reduce thecurrent[since the motor shouldn't be overloaded].Motor used,Possible replacements,?Pid=searchBTW, what is the difference between a Y and YZ frame?Thanks for the help,Bob

Jul 24, 2010 42 Replies

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Steve 15 years ago

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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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Michael A. Terrell 15 years ago

My point is that not all news readers see it as a hot link, without the http:// prefix.

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Michael A. Terrell 15 years ago

Fine. I hope that you enjoy your glass belly button.

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