Determining servo motor specifications

Hi,
With the help of Steven Ciciora I have determined the following
motor parameters for the Clifton Precision Model DH-2250-AU-1
DC permanent magnet brush servo motors.

Kv = Voltage Constant = 7.37 volt/K-rpm
R = Terminal Resistance = 1.62 ohm

I have also computed the other motor parameters/specifications
at no-load, stall, peak power and peak efficiency loads, each
at a terminal voltage of 24, 30, 36, 42 and 48 volts.

My question is:

How do I decide what current or torque load to use to compute
the specifications at "Rated" load?

I don't have any manufacturer's info for this motor.

The manufacturer's data sheet for a similiar 4", newer model,
Clifton C23-L40-30 servos shows the "Rated" specifications
at a torque load that is 10.12% of the Stall Torque at a
rated voltage of 36 volts.

The manufacturer's data sheet for a similiar 4" long Pittman
14204 servo shows the "Rated" specifications at a torque load
that is 12.75% of the Stall Torque at a rated voltage of
24 volts.

The manufacturer's data sheet for a similiar 4" long Globe
servo shows the "Rated" specifications at a torque load that
is 12.63% of the Stall Torque at a rated voltage of 24 volts.


Secondly, how do I decide what terminal voltage to run the
servos at for CNC use? I do notice that as the voltage is
increased, the efficiency of the motor increases. So is it
best to use a higher voltage? How high is too high?

The manufacturer's data sheet for the newer Clifton
C23-L40-30 servos states that its allowable terminal
voltage is 12 - 48 volts.

The data sheets for the other motors do not specify the
allowable voltage range, they only specify the rated voltage.


Finally, how do I determine the peak current limit so that
I do not fry the magnets?

Having fun,
Wayne Whippo (Boulder, CO)