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Hello again
I found the article that Fred Porter recommended at
ASHRAE's bookstore, in the Transactions section.
The article is titled Efficiencies of an 11.2 kW Variable Speed Motor and Drive and has metered data of
both motor and drive efficiency at different loads and speeds. Not sure
how well this applies to larger motors, but it so happens that the motors I am
looking at right now are in this size range, so this does the
trick.
Thanks to others who pointed out the timely article
in this month's Engineered Systems, as well as a previous article in ASHRAE
Journal from 1999.
Thanks again to all.
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