----- Original Message -----
From: "rad0" <rad0@ATTBI.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, November 08, 2002 6:39 AM
Subject: Re: [ot]: stepper motor heating up the resistors??


> > I assume that your stepper is rated for this current?
> it's rated for 2.0 amps, but I needed to limt it to 1.25 for the
> 5804 controller
>
> > Even a 10 watt resistor will get very hot at this power level.
> how can I make it cooler, and use this controller chip??  is there
> a way?
>
> . This sounds like
> > excessive power to be throwing awy unless you are really really keen on
> > performance and cannot get it any other way.
> This motor is for a sherline mill, a cnc setup, so performance is an
issue?
>
> I don't really understand what voltage is OK or what voltage should be
used
> for this motor.  On the list of specs, it says 3.2V.  What is this? a
> minimum?
>
> I guess 2.0 amps is all you need to worry about.  Then the power
generated,
> or heat to be dissapated away somehow?  is this true?
>
>
> thanks very much
> >
> > > ANY help is much appreciated, thanks
> > >
> >
> >
> > > Second, the motors seems to jump around occasionally, my program
> > > steps 400 steps in one direction, then reverses and steps 400 steps
the
> > > other way. ( this thing is 1.8deg step angle, set on half step)
> >
> > Whether this will work depends on what your stepper is specified at for
> the
> > given load. At 20/ms/step that's 50 steps/second which is well within
the
> > capabilities of many (most?) stepper motors DEPENDING ON LOAD. What
speed
> > you can step at at a given torque/load and a given power level will be
> > specced by the manufacturer. Is this essentially unloaded or with some
> load?
> > If loaded, what is the load?
> >
> >
> >         RM
> this I don't understand at all
>
> the load right now is a piece of tape, so I can see the shaft move.
> (it is continuously running though)
>
> looking at the spec sheet, I see a 'motor torque curve' chart for a
> given driver/current/exciting mode/inertial load
> where torque is on the y axis and frequency(pps) on the x axis?
>
> do you have a quick explanation of these units?
> frequency(pps) what does this stand for and is it steps per time
> unit -somehow??
>
> and torque (kgf-cm) - this isn't in my memory banks either...
>
> thanks very much again.
>
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