wrote:
On Jul 31, 9:13 pm, "Toller" wrote:
(And please don't get into the calculations of how many amps go into a hp.
For normal motors it is approximately 22a; for expensive high efficiency
motors maybe as low as 16a. It is never 14a, and HF does not use expensive
high efficiency motors; it is probably a tad more than 1hp. And that
assumes it actually draws 14a; an uncertain issue.)

I am selling a canister DC with a real 2hp motor; asking $225. Two people
have offered $200; for that price I will scrap it and save the motor in case
my TS motor ever calls it quits, since the motor alone sells for $300.

Anybody got any links or something where I can research that? I
confess I'm not well-versed in motors as I used to be, but everything
I've ever been taught says if it pulls x amps on y number of volts,
it's using xy watts and therefore xy(cf) horsepower. How is horsepower
measured in this case?

Input vs output...you're right on the input calculations energy used.

To measure actual motor hp requires a dynamometer.

Efficiency is measured as the difference.

http://www.engineeringtoolbox.com/el...ncy-d_655.html

Much below 75-80% is a pretty inefficient motor for full hp motors.
It's possible HF motor might not live up to that, but most of the
cheapness ime is from sleeves vs bearings and other mechanical factors
more than the power consumed/hp. But, I've not put one on a
dynamometer, either, and doubt whoever is doing the bitching has,
either...

The big problem usually is simply one of nameplate bragging a la a the
Craftsman "peak" hp crap...

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