Need Help!- Electrocraft PMDC servo ID ? Plz !

[Schweinhund227]

Hello all !

I need help !

I put my hands on a Used but in good condition Electrocraft PMDC servo motor from Al the Man ... well Now I want to power it up !

I have eyeballed this product ! from KB ! and was wondering if it could do the trick ??

Here is my Servo ID Plate !
it very plain !!! and any help Id this motor would be welcome...

as I need to find the HP this baby can deliver !

it comes with a Tach ! so I guess this will feed Speed feedback to the speed controler ? I'm new to this ! but I'm willing to play !!!

I found an Info sheet from Electrocraft Legacy Catalogue and was wondering if it could be the one for my Motor ? it's for a G700 series


Let me know !!!

Norm

out !

[jalessi]

Norm,

Why not ask Al? He knows these like the back of his hand.

Jeff...

[Al_The_Man]

I think I mentioned this has a terminal voltage of around 60vdc, IIRC.
I found this out by empirical test.
The KB should run it OK, but you will have to restrict it from max output, put a resistor in series with the pot or method used to control the speed in order it does not over speed on full 90vdc, I would not run it over 2500~3000 rpm to be on the safe side.
Unfortunately I believe the plate info is OEM part numbers which makes it difficult to pin down exact specs.
Al.

[rgkerber]

I am trying to get a print for you for this motor. I think Al is right that this motor is designed to run at only 60VDC. It will run with a 90VDC drive but it will eventually pit the commutator on the armature.

I'll let you know what I come up with.

Email me with any questions

Rob Kerber
VP/GM Motion
ElectroCraft
rkerber@electrocraft.com

[Schweinhund227]

Thanks Guys....

So... I am not too far off on my Driver selection...

I'll try to find one... near 70 or 80V and look for Big Resistors....


And another question ! Under Electrical Data in the Catalogue image...
under A and B what is the meaning of those letters ?

for each variant.... has 2 columns A + B ?
and the Tachometers... Do I have to do a Imperial Measurement on the output of the tach...or can I measure the impedance ! and Gestimate ?

and I'll try not to fry the motor...

Al would not be impress !



and thank you for looking for that Data Sheet for this Motor....

Take care ALL ~

Norm

OUT !

[Al_The_Man]

The Tach output is a generated DC voltage proportional to rpm, usually indicated in v/1000rpm.
You can easily measure this at a given speed.
Don't put any resistors in series with the motor, the one I indicated would go in series on the high end of a control potentiometer for example.
Also there are quite a few A-M-C servo controllers on ebay that can be run in the velocity mode for spindles.
Al.

[Schweinhund227]

Thank you AL !

I see your point ! about the Tach ! and about the Resistor... on the Pot !

what about the Horse Power Resistor... ??? on that KB Drive ?

They come in all Flavours...

the A M C drivers... well !!! are out of my League ! 300$ ouchie !

I don't need anything fancy !!! but controlabe via Mach 3 !!! with analogue ref. voltage from the Tach as a Spindle Speed Control Accel and Decel !

are Breaking Resistors required ? or a controlled Decel time good enough ?


Sorry for the Many questions but I don't want to Burn anything...

ie. when the Servo is Free spining... and feeding EMF back into my board !

so much to learn so little time !!!


Norm

out !

[Al_The_Man]

I would go with a 1/2hp value to begin with. The worst case scenario is you would go into current limiting earlier, but I don't think that will happen.
Al.