Leo Lichtman wrote:
"Louis Ohland" wrote: (clip) does this mean more kick per RPM by the lower
speed drive?
^^^^^^^^^^^^^^^^
I've never heard of anyone calculating amps per RPM, and I think that is
because it is meaningless. First question: How do you know that both
motors are developing 1 HP? Are the figures you listed measured or read off
the nameplates? Of course, you get more torque at lower speed for a given
horsepower. If the figures are accurate, then motor A is slightly more
efficient than motor B.



Well, some manufacturers do not make finding their torque graphs readily
available. The amps were off a manufacturer's website, but they are just
summaries. No tables or graphs at all.

Motor A: 1HP, 90V, 2500 RPM, 10.7A 4.28A per 1,000 RPM
Motor B: 1HP, 90V, 1750 RPM, 9.2A 5.26A per 1,000 RPM

Efficiency aside, neglecting heat loss, wouldn't using a motor rated to
deliver 1HP at a lower RPM be better?