This is a quote from wikipedia"
Where units of horsepower are used for marketing consumer products, often
measurement methods are designed by advertisers to maximize the size of the
number produced for any product, even if this may not reflect realistic
capacity of the product to do work when used in normal conditions.
Now to say why one motor works great and even a larger one can't perform
even close depends on a couple things. Older motors ran maybe up to 1600 rpm
and were rated to start at full load or better conditions and had service
factors greater than 1. Many of the newer ones run at speeds over 3600 and
smaller ones at over 7200 rpm. Because of the speed difference, lets say a one
hp motor runs at 1200 rpm and a 1/6 hp motor runs at 7200 rpm, both can do the
same amount of work in the same time depending on how you look and compare. So
the 1/6 hp motor can be as rated to do 1 hp work, but there is no power
comparison. Routers are a good example as are saws. They run at speeds at
32,000 rpm up to 72,000 rpm and more. The motors are rated work-wise due to
the speed at which they work and have nothing to do with load, not capable
power to do work. Also most are now designed to have ratings not even
associated with starting, forbid.
Also with dc motors and speed controllers on ac motors that start on low
power speeds, they can fudge power ratings as starting with heavy loads, when
in fact the ratings do not include full speed or for any duration of time if
the unit overheats and shuts off and stalls. Their answer is you must have
done something wrong or it was just bad power circuit connection.
When they say rated at, it can be quite a bit off from what it actually is
in fact.
................bob
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