Re: [CAD_CAM_EDM_DRO] Unknown servo motor specs

David Micklethwaite wrote:

> Jon Elson wrote :
> >
> > If this has a part #, I can try to look it up in some old Electro-Craft
> books
> > I have.
> >
>
> Jon,
>
> I have three Electro Craft motors:
>
> The numbers on them are:
>
> PN Customer PN Date
> Code
> 0660 07-017 65-005-01F 246
> 0660 07-017 65-005-01F 246
> 0660 07-024 SK300817 268

> Apart from that they appear to be identical (externally). 3.25" dia x 5"
> long with 0.5" shaft at the drive end and a 0.25" shaft at the other end
> with a small electro mechanical clutch/brake mounted on it.

Apparently, these were once called E-660 series motors, as the
mechainical dimensions match precisely.

The series specs are :
Max Cont torque 120 Oz-In
Armature inertia .030 Oz-In-Sec^2
Rotational loss .68 Oz-In/KRPM
Eletrical time const. 2.9 mSec
Mech time const 6.5 mSec
Max friction torque 5 Oz-In
Thermal Resistance 2.8 C/Watt
Max armature temp 155 C

This series has 5 winding variations available, with numbers from -01 to
-05. I don't know how the 07 fits into that, but maybe the customer part
# with the -01F is indicating the -01 version.

Anyway :
-10 -02 -03 -04 -05
KT (Oz-In/Amp) 13.2 27.6 44.2 66.1 88.5
Ke (Volts/KRPM) 9.76 20.4 32.7 49 65.5
Resistance,Ohms .44 1.28 3 7.1 11.42
Inductance,mH .78 3.4 8.7 19.5 34.8
Imax, Amps 54.2 26 15.8 10.7 8.1

You could probably figure out which winding you have
using the Ke measurements.

Jon