Can anyone ID this DC servo?

[erikjgreen]

I have a couple of servos I'd like to use for something. The problem with them is that they're older DC servos and the nameplates are long gone - they've been repainted and/or cleaned away.

I can work out the Kv and Kt parameters by testing, but I still won't know the max voltage and other specs.

So, I'm hoping someone here recognizes them.

They're 4 brush motors about 5 inches in diameter and 17 or so long with a tachometer and BEI encoder attached under the rear cap. I'm going to guess they are maybe vintage 1985-1990?

The one identifying mark they had was an old sticker with "Dynex" on it. The phone number matches Dynex Industries Inc, a defunct (or mostly so) company that did electrical service work, so I'm thinking they serviced this motor rather than manufactured it.

Thanks for any info (even brand) that anyone can supply.

Pics are attached.

Attachment 385160

Attachment 385162



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[Al_The_Man]

Back feed it from a source and test the generated DC output while reading the RPM, the typical max rpm for that motor would be around 2krpm.
Extrapolate the voltage measure for the 2krpm figure.
Al.

[erikjgreen]

I've done that, and it's about a 40V/krpm motor. From that it's either an 80V (2k rpm) or 100V(2500 rpm) motor.

The diameter of it compared to e.g. Baldor DC servos would lead me to believe it's likely a 2000rpm or less motor. Using the 80V estimate and a resistance measurement I can estimate max amps, but getting a good measurement I can trust is difficult.

I'm still hoping someone recognizes the style or can point me to a manufacturer. I'd like to know the specs for certain if at all possible.

[Al_The_Man]

This might help some.
Al.