Re: [CAD_CAM_EDM_DRO] How to test a servo motor without servo drive?

What I did to test them motor (which is much less likely to be defective in
my opinion than the encoder itself) was power it through an AC variac and
its appropriated dc supply.. ...ramp it up, watch it spin, ramp it down,
done.
R. William Kichman, P.E.
Kichman Engineering Associates
103 Old Furnace Road
Cornwall, PA 17016-0643
tel/fax 717/270-0714

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, August 10, 2003 2:31 AM
Subject: Re: [CAD_CAM_EDM_DRO] How to test a servo motor without servo
drive?


>
>
> autom8_it wrote:
>
> >I am doing a retrofit and I recieved my servo motors but I am still
> >waiting for drives from Rutex. I would like to test the motors now
> >and I am wondering if there is an easy way to do that without risk of
> >damaging the motor?
> >
> >
> These are DC brush motors? You can test them for basic function with
> a D cell battery. You don't want to apply a sizable DC voltage from a
> power supply with a lot of current capacity as that could cause a burst
> of current strong enough to erase the magnets.
>
> >My guess is that a constant DC level will work but I would imagine
> >that I would have to limit the current. It seems too simple to use
> >ohms law and put in a series resistor?
> >
> >
> If you want to run it at some speed with a big unregulated DC supply, then
> a series resistor is a must. For instance, with a 70 V supply, and a peak
> current rating on the motor of 10 Amps, then a 7 Ohm resistor is perfectly
> safe. One problem is, even WITH the series resistor, the motor would
> LEAP off the table unless it was securely fastened down.
>
> Jon
>
>
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