maybe it will help to understand that horsepower is a measure of power, not
force - torque is "force", RPM is "speed", power is the product, so to
speak. one horsepower is 3300 ft-lbs per minute - e.g. a one horsepower
motor can lift a 3300 pound weight (not mass) one foot in one minute, or it
can lift a 1 pound weight about 2/3 of a mile in the same time.



"Jon Elson" wrote in message
...
Louis Ohland wrote:
After some web surfing, with HP being the same on a permanent magnet DC
motor, is a lower RPM for the given HP better than a higher RPM for the
same HP?

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

Since I'm a recovering college graduate, does this mean more kick per
RPM by the lower speed drive?
Motor B has more torque at rated current. The A/RPM is meaningless,
derived by dividing the rated full-load current by the rated RPM. One
interesting observation, though, is that motor B is 16% more efficient
than motor A, since they both deliver 1 HP at the same voltage, but B
draws a lot less current.

Jon



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