Japan Servo KP86LM2-005, Any specs available?

[technisol]

Hi guys,

Can anyone please help with specs for Japan Servo KP86LM2-005 steppers? Closest I've found search-wise is KP86SM2-002's. (around 300 0z/in?)

I think they're Nema 34(about 2-13/32" mounting centers), and they say DC 1.8V, 1.8 Deg/Step, N0.5Z13 and that's it... No current rating, and no torque specs. I have a couple dozen of these and I'd like to use them, but think I need some specs to set current in my drivers, etc.

I tried Japan Servo's website, and it only lists currently produced models by the looks of it. Any info would be appreciated, and if anyone has any thoughts regarding experimentally determining any parameters I'd love to hear more -preferrably concerning methods ever so slightly short of testing to destruction...

Thanks in advance!

[technisol]

Ok, I've since found specs for an AMP - Applied Motion Products #4034-326 stepper motor which looks A LOT like mine. Similar specs as well(at least for those i have...):

Series connected:
2.5" long, 212 oz-in, 6 wire, 1.8 Deg/Step, 2.5V, 3.32A, 0.8 ohm, 5.0Mh, 3.0 lbs.

Unipolar connection:
2.5" long, 150 oz-in, 6 wire, 1.8 Deg/Step, 1.8V, 4.70A, 0.4 ohm, 1.3Mh, 3.0 lbs.


My KP86LM2-005's say or measure:
2.5" long, ??? oz-in, 6 wire, 1.8 Deg/Step, 1.8V, ???A, 0.4 ohm, ?Mh, 3.0 lbs.

Bear in mind, the 0.4ohm is measured across half a coil(well, between one end and the center tap), or in a unipolar configuration, and the series resistance on mine equals 0.8 ohms the same as the example sited. I don't have an inductance meter or I'd verify that as well.

Okay, here's the $64K question, from the above similarity in specs can I somewhat reasonably infer that my motors might draw about 3.32 Amps, and provide around 212oz-in if connected in series mode?

If I have a bipolar driver, would I be better off using only half of each series pair of coils? Would I be giving up 62 oz-in of holding torque vs. using the whole coil on each side? How would I then interpret my voltage and current in that configuration? (1.8 Vdc @ 4.7 A?, or 2/3 that amperage?)

I know some of you must have had similar experiences, take pity and tell me what you think.

Thanks,

G.

[technisol]

Ok, this is getting ever so slightly pathetic...

Having given this some thought can I assume(oh boy, look out here it comes...)
that E=IxR (ohm's law):

E = 1.8Vdc, I = ?, R=0.4 ohms, then 1.8 / 0.4 = 4.5 Amps ???

That seems to match up reasonably with the specs cited earlier from a similar motor... Or am I left to rig this up, set the drivers for appropriate amperage and then measure actual torque with a scale arrangement?

Whadaya think?