Re: Motor Specs

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
Thanks Jon;
That's about what I expected. The K(sub)e @ 1000RPM is between 4.95
and 6.05V for these motors. I thought they woule be a bit small for
this application. Maybe they'll end up on a router or a small
lathe. Time to shop for new servo's. Thanks for all of your time.
You have been a great help.
billyjack


> pug_harley_corvette wrote:
>
> >Thanks Bubba;
> >I think I'm on the right track and with the help of this group, it
> >should be quite benificial (and even fun). I received some info
on
> >my servos (which I purchased on ebay) and was quite disappointed
(I
> >think). The servos are obsolete and are electro-craft model
e586's.
> >I have 5 of them. The dwawing I received from the factory list
them
> >as "servo tachs" and have a built in tachometer. The specs on the
> >servo is 30V DC with a no load speed of 5700 RPM. The no load
> >current at rated voltage is .65 amps. Armiture resistance
(dynamic)
> >is 1.00 ohms min to 1.25 ohms max when checked at 4 amps. Is this
> >enough information to figure out the torque of these things???
> >
> No. You need at least some measure of power out at some known speed
> to compute torque. We don't even have a continuous or peak power
rating
> there.
>
> But, I have an old Electro-Craft catalog. The E-586 has a
continuous torque
> rating of 32 Oz-In. You don't give a dash number with the model,
so I can't
> tell what winding you have in these motors. The Kv I extract from
the above
> figures don't match the terminal resistance you specify. But, the -
01
> has a Kt of 10.02 Oz-In/Amp, and Kv of 7.42 V/KRPM, and a 1.55 Ohm
> resistance. This motor has a peak current rating of 24 A. So, the
peak
> torque
> is 240.5 Oz-In. The -04 winding has a Kt of 20.05 Oz-In/Amp, and
Kv of
> 14.85
> V/KRPM, peak current 12 A. So, peak torque is the same.
>
> Anyway, you are going to need at least a 4:1 belt reduction to use
these
> motors,
> and I might recommend a 6:1.
>
>
> Jon