Thank you for the effort...  I guess I will have to put off this project a bit 
longer.  At least until I can purchase some suitable drives.

N. Christopher Perry

On Aug 30, 2012, at 11:01, Matthew Herd <[email protected]> wrote:

> 
>> 
>>> 
>>> Anyway, I've got some Parker OEM650 stepper drives on hand and would like 
>>> to use those for my retrofit, but they will only accommodate phase 
>>> inductances of 1 - 10 mH.  Does anyone know what the inductances are for 
>>> the Superiors and Sigmas?
>> 
>> I can't answer this one with certainty, but the G203V tolerates 1-50 mH and 
>> it works well with the steppers on my BOSS.
>> 
> Actually, I took a quick look at the specs for the parker drives.  It seems 
> the most it can handle is a NEMA 34.  Looking at the specs on the Keling 
> website for NEMA 34 & 42 motors, it seems that the inductance in series (what 
> I suggest for lower current drives) is going to be significantly higher than 
> 10 mH.  I think they were consistently over 10 mH, with the 42's at like 64 
> mH.  The BOSS motors should be in the same neighborhood, so they will 
> probably be too high for the Parker drives.  Just a little inductive 
> reasoning here, I have never measured the motor inductance nor could I find 
> reliable specs.
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