On Tue, 01 Jun 2010 22:11:40 -0400, wrote:

On Tue, 01 Jun 2010 20:36:38 -0500, "
wrote:

On Tue, 1 Jun 2010 14:25:33 -0400, "Josepi" wrote:

Quite a few technical electrical errors there but you concept is almost
correct.
A one HP motor make use of 748 Watts, not consumes.

Nope. A 1-HP motor *delivers* one horsepower of mechanical power
(550ft lbs/second). Only a 100% efficient motor would require only 748W (BTW,
"watts" is not capitalized).

120v X 10A = 1200va not watts
Many 1/4HP furnace motors take about 10A at 120volts. How do you figure that
one?

I don't believe you. A 1HP motor may require 1200W at full load, but not a
1/4HP motor.

It can draw 1200 watts at startup. Not terribly uncommon. When
rotating, a whole lot less.

Agreed.

The new 5HP motors are including the inertia of the rotor and do not specify
"how long" they can deliver that HP.

Nope. Well, maybe Crapsman's HP rating. ;-)

Foot lbs torque @ rpm- a heavy rotor or flywheel CAN deliver
significant horsepower for a matter of seconds - after it has been
brought up to speed. In SOME applications, a heavy flywheel will alow
a much smaller than normal motor to do the job.

Ok, but that's not the way motors are rated or HP is calculated.

...