On Jun 19, 12:58 am, "Montblack" Y4_NOT!...
wrote:
("GeorgeB" wrote)

There is a guy (a lawyer, darnit) who has done some research in this;
I understand that he was involved in a complaint against the wild
numbers used in advertising ... take alook at
http://users.goldengate.net/~kbrady/motors.pdffor some interesting
info

My old memory has it that motors are rated by the heat that they can
dissipate, rather than the torque/ revs that they produce, or
electrical energy they consume.
An example would be: if we have a constant load that will raise the
frame temperature to an acceptable level, then that torque/rpm is the
rated hp. The motor will produce much more torque, but it will
overheat at that hp output. You see the effect of this rating on the
frame style, with open frame having a much higher hp rating than a
sealed explosion proof motor, with similar dimensions and windings.
The really wild ratings are the "protection ratings", where they
advertise the hp load required to trip the overheat circuit breaker,
by definition that is more hp than the motor can safely produce. How
is that for useless information ?