Re: servo Motors

Mariss, That torque calc is a good trick. Does it work with any
other kinds of motors.

Wally K.


--- In CAD_CAM_EDM_DRO@egroups.com, "Mariss Freimanis"
<geckohall@h...> wrote:

> Hi,
>
> John, if you don't mind doing a little math and some careful
> measurements, here's how you can characterize your motor.
>
> What you are looking for is your motor's stall torque.
>
> 1) Measure the armature resistance.
> 2) Measure the no-load speed at rated voltage (30VDC)
> 3) Use the following equation:
>
> T = (1352 times V squared)/(2R times S)
>
> Where:
>
> T=Stall torque in in-oz
> V=Power supply voltage
> R=Motor armature resistance in ohms
> S=Motor's no-load speed in RPM
>
> The accuracy of the results depends on how accurately you measure

the

> armature resistance (most important) and how accurately the no-load
> speed is measured.
>
> As they say in car commercials regarding miles/gal "your results

may

> vary"
>
> Mariss
>
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, "John Brauweiler"

<marble_h@y...>

> wrote:
> > Last week I told all about the calcomp I got, well it is almost
> apart
> > what I need now is to find out the OZ rating on it .Would anyone
> > knowwhere I can get some infomation on a Hathaway Servo Motor . I
> > sent an e-mail to Hathaway and received no reply,They are 30 volt
> > servos . I do know that the servos will take 15lbs of pulling

force

> > before the overload kicked out on the Calcomp I used a pull scale
> to
> > see when the servo's would kick ,Yes I know not a good way of
> > checking but what the heck right .Almost like the sand and cup
> > Thanks group
> >
> > John