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Old August 8th, 2014, 10:38 AM
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Default Electric motor ratings

I'm getting ready to put my second vacuum pump setup together. On both maple sites I have read where farm duty rated is the way to go for a vacuum pump. I can buy a marathon motor for about $50 less than a farm duty motor like I have on my existing setup. Both motors are capacitor start and both have 1.15 service factor. Both are also continuous duty rated. Is there some other benefit of the farm duty that I am missing?
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Old August 8th, 2014, 10:40 AM
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I was told that farm duty motors can handle the dusty/dirty environment better.
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Old August 8th, 2014, 06:47 PM
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There sure is a lot to learn about electric motors and at $10.00+ a day to run these vacuum pumps a deal on a less than efficient motor can be not such a deal. On my compressors I've found the externally cooled enclosure design to last longer even though they run hotter just because dirt and dust doesn't get pumped into the bearings and brushes. Grease fittings for the bearings is also a plus. Our power bill has gone up and down $50.00 due to new motors on the compressor.

Some good info here. http://www.pdhonline.org/courses/e156/e156content.pdf
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