[simpits-tech] stepper motors
Ido Dekkers
simpits-tech@simpits.org
Mon, 3 Feb 2003 08:51:36 +0200
but you still haven't told me the difference between a unipolar and a
bipolar one, anyone ?
Ido
"John P.
Miguez"
<jmiguez To
@bellsou <simpits-tech@simpits.org>
th.net> cc
Sent by:
simpits- Subject
tech-adm Re: [simpits-tech] stepper motors
in@simpi
ts.org
02/03/20
03 05:20
AM
Please
respond
to
simpits-
tech@sim
pits.org
I will say, you guys do know your stuff. That is a very comprehensive and
detailed answer. Thanks for taking the time to write it out. Between you
and Martin, I have an education on stepper motors and servos. Thanks again
to both of you.
John
----- Original Message -----
From: "Marv De Beque" <mdebeque@woh.rr.com>
To: <simpits-tech@simpits.org>
Sent: Sunday, February 02, 2003 3:14 PM
Subject: Re: [simpits-tech] stepper motors
> Hey, I can answer that.
>
> A stepper is a motor that moves in a specified direction one step at a
time.
> You can specify the number of steps to be taken by repeating the step
> command. Actually, that is a bit misleading. There are different types
of
> stepper motors, but basically, a quadrature signal (two square waves at
90
> degrees out of phase from each other) are applied to the motor. Each
cycle
> of the waveform moves the motor one step. If you reverse the phase
> relationship at startup, the motor will run in the opposite direction.
> There is usually no limit as to how far the motor can be turned. That
is,
> it can rotate indefinitely in any direction.
>
> A servo usually has a limit of 180 degrees. It is controlled by a
periodic
> pulse. The width of the pulse is proportional to the position of the
motor.
> If you stop the pulses and park the servo, the position is maintained.
>
> Servos use a potentiometer to measure the shaft position of the servo.
> Circuitry in the servo compares the pulse width of the input signal to
the
> resistance of the pot. The circuitry will then move the motor to that
> position and stop.
>
> Servos can be modified to rotate continuously, but you loose the ability
to
> determine the shaft position.
>
> I use servos for gauges where the needle moves less than 360 degrees. I
use
> step up gears to double the shaft rotation to do that.
>
> Marv
>
>
> On 2/2/03 3:27 PM, "John P. Miguez" <jmiguez@bellsouth.net> wrote:
>
> > Also, what is the difference between a servo and a stepper motor?
> >
> > John
> >
> > ----- Original Message -----
> > From: "Ido Dekkers" <idekkers@clicksoftware.com>
> > To: <simpits-tech@simpits.org>
> > Sent: Sunday, February 02, 2003 7:35 AM
> > Subject: [simpits-tech] stepper motors
> >
> >
> >>
> >>
> >>
> >>
> >> What is the difference between bipolar and unipolar motors ?
> >> Which of them does the stepper phidget support ?
> >>
> >> Thanks
> >>
> >> Ido
> >>
> >>
> >
> > _______________________________________________
> > Simpits-tech mailing list
> > Simpits-tech@simpits.org
> > http://www.simpits.org/mailman/listinfo/simpits-tech
> > To unsubscribe, please see the instructions at the bottom of the above
page.
> > Thanks!
>
>
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