Re: servo Motors

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