Servo motors will run at max RPM when the rated voltage is applied. If your servo driver is PWM (dugon 160V 35A), your PS output voltage does not have to match your motors max voltage rating, the PS out can be more, then you set the max PWM parameter on the driver so average RMS voltage to the servo motor is not more than the motors rating.
The motor does run at the predicted RPM based on the voltage I am reading on the voltmeter. i.e. the motor spec is 13.36V per K RPM and that pretty close to where it runs if you go by the measured voltage.
The quandry here is that the voltage coming off both the servo drive (PWM) and the motor controller (also PWM) does not *measure* what it should. I'm interested in knowing the reason, which I can only imagine could be;
1) ?? Full PWM is not really *full* as in full time *on*,
2) ?? There is some sort of loss in between the input and output of the PWM scheme,
3) ?? The full voltage is actually there, but a normal voltmeter cannot read it correctly becuase is is pulsing,
4) ?? A DC brush motor 'sees' the voltage in the same way as a standard voltmeter, in which case it would seem logical to size a PS higher than the motor's rating if you are using a PWM scheme, but I have not been able to find anything difinitive on that, although I have not looked very hard yet.
Interestingly, The Minarik drive is rated at 130VDC output, yet the instructions for setting the various pots uses 90V motors as examples. Is there a message there?
I'll have another piece of the puzzle when I do as Ray suggested and run the motor straight off the 74V PS.