little step-u
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I'm running a stepper motor with the little step-u, never done that before,
and I notice the motor is getting really hot. I assume that it isn't
supposed to do that but I'm not sure what I'm doing wrong, any ideas?
and I notice the motor is getting really hot. I assume that it isn't
supposed to do that but I'm not sure what I'm doing wrong, any ideas?
Comments
able to make more specific recommendations if I had a schematic.
Leroy
raoul vaneigem wrote:
>
> I'm running a stepper motor with the little step-u, never done that before,
> and I notice the motor is getting really hot. I assume that it isn't
> supposed to do that but I'm not sure what I'm doing wrong, any ideas?
>
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It sounds like the motor is always activate even when not in use. If
so, consider adding a relay to turn off the motor power until you need
it. You can activate a solid state relay to do this with one stamp pin.
Dennis
Original Message
From: raoul vaneigem [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=njxFowKc4LwgeI-3SC93tqd3_L9X1VLQz0r8j9z6ju7MT_zJqYKoe_yDotQEDg3Kfvdi656o2nA]raoul@c...[/url
Sent: Tuesday, April 30, 2002 3:19 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: little step-u
I'm running a stepper motor with the little step-u, never done that
before,
and I notice the motor is getting really hot. I assume that it isn't
supposed to do that but I'm not sure what I'm doing wrong, any ideas?
To UNSUBSCRIBE, just send mail to:
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worry about. But I would consider not braking the stepper motor any more than
needed.
Jim Gorbet
raoul vaneigem <raoul@c...> wrote: I'm running a stepper motor with the
little step-u, never done that before,
and I notice the motor is getting really hot. I assume that it isn't
supposed to do that but I'm not sure what I'm doing wrong, any ideas?
To UNSUBSCRIBE, just send mail to:
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[noparse][[/noparse]Non-text portions of this message have been removed]
the coils.
Leroy Hall <leroy@f...> wrote: Maybe the current is not set right?? That a
possibility?? I might be
able to make more specific recommendations if I had a schematic.
Leroy
raoul vaneigem wrote:
>
> I'm running a stepper motor with the little step-u, never done that before,
> and I notice the motor is getting really hot. I assume that it isn't
> supposed to do that but I'm not sure what I'm doing wrong, any ideas?
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and Body of
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Yahoo! Health - your guide to health and wellness
[noparse][[/noparse]Non-text portions of this message have been removed]
You should have a resistor in series with the power supply lead (s) to the
motor. Actually, the motors are rated to run VERY hot.
You can also run the stepper controller in bi-level mode. Use an
opto-isolator and a mosfet and a power resistor. Limit the current to the
motor with an appropriate power resistor so that you have the holding
current you want. When you are ready to step, have the stamp send an
output high to the opto-isolator. The opto-isolator will be configured to
turn on the mosfet, which is shunting the current limiting resistor. When
you are done stepping, turn the opto-isolator off. Actually, real bi-level
controlling raises the voltage to the motor until the current in the
windings has reached a fixed level and then returns it to a lower voltage.
That's probably more than you want to do :-)
If you haven't done so, you may want to check out
http://www.wirz.com/stepper/index.html. Wirz gives a lot of helpful info on
steppers and their controllers.
Mike
At 03:18 PM 4/30/2002 -0700, you wrote:
>I'm running a stepper motor with the little step-u, never done that before,
>and I notice the motor is getting really hot. I assume that it isn't
>supposed to do that but I'm not sure what I'm doing wrong, any ideas?
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
_________________________________
Mike Walsh
walsh@i...
[noparse][[/noparse]Non-text portions of this message have been removed]
You *can* control more than one motor with a controller, however....
1) you cannot control them both at the same time
2) they must be matched, volts,amps etc
3) you risk loosing steps.
Obviously, #1 is self evident. on an X and Y axis, you cannot use
one signal to step one motor 17 steps while it is stepping the other
3 steps.
#2 should be obvious. Since a stepper performs well at 10 to 20
times it's rated voltage, a small change in motor spec can be a big
change in performance.
A stepper drive with limiting resistor will offer a slight solution
as you can just use the proper resistor for each motor. A chopper
driver will be MUCH more efficient and a stepper driven with a
chopper will deliver much more power. However, you need to handle
the motor generated voltage when you remove power and it is still
spinning.
Lastly, anyone playing with a stepper for the first time gets a kick
out of the simple way to testing which leads are which. one can
rotate a stepper easily by hand, until you connect any two leads on
the same circuit. This is just taking a stepper and shorting the
motor's own wires, no external stuff. As soon as there is a proper
pair shorted, the motor locks up.
Then there is the holding power from the drive itself. If your
plotter has any force on one axis while the other is moving, it may
move the un-powered axis. you can short any pair of leads from the
un-driven motor and get a little holding torque, but you cannot use
the controller to hold the motor.
This may be OK on your plotter app, but on a machine tool it could
lead to real problems.
Those three ought to make you re-think the idea. We all have had
that idea to try to save a few bucks, save a few output pins, reduce
size....
And one other problem is speed. you need to select a channel, drive
it, change to another channel, drive it.... imagine trying to draw a
curve, one step at a time... up, over, up, over... you will find the
time to do so unbearable.
Like I said, you CAN use one, however.....
Dave
--- In basicstamps@y..., "manwithapipe" <manwithapipe@y...> wrote:
> Just a quick newbie question regarding the little step-u...
> Is it pretty much a 1:1 ratio to # of little step-u's to # of
stepper
> motors? Or is there a clever way to wire up a little step-u to run
> more than one stepper motor independently. The reason why I ask is
> because I am designing something that operates similar to a plotter
> and need to know if one step-u can run both x and y. Thanks!
>
> Andrew
from parallax to a basicstamp2 there directions are not to clear to me.
the controller has a serin and a serout pin I hooked pin10 of stamp2 to serin
oncontroller hooked pin 11 to serout on controller .This is there instruction{U}
SHOW STATUS,RETURNS[noparse][[/noparse]POSITION,SPEED,RAMP}
there is no example for this particular code all oter code has an example so I
tried this.
baud con 396 '2400 baud
cpos var word
serout 10,baud,[noparse][[/noparse]"{Q}"] 'SET POS REGISTER TO 0
GOSUB CKBUSY
SEROUT 10,BAUD,[noparse][[/noparse]"{U}"] 'OUTPUT DATA FOR STATUS
SERIN 11,BAUD,CPOS 'READ DATA
THE Q COMMAND WORS FINE AND THE SPEED AND DIRECTION COMMANDS WORK FINE I AM NOT
SURE ON HOW TO WRITE THE SERIN AND WHAT KIND OF VAR I CAN USE.ANY INFO WOULD BE
HEPPFUL
THANKS MAX
[noparse][[/noparse]Non-text portions of this message have been removed]
Original Message
From: "max powell" <mpowell@t...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, July 29, 2002 12:05 PM
Subject: [noparse][[/noparse]basicstamps] little step-u
> Iam trying to get a read back from a little step-u stepper controller
purchesed from parallax to a basicstamp2 there directions are not to clear
to me.
> the controller has a serin and a serout pin I hooked pin10 of stamp2 to
serin oncontroller hooked pin 11 to serout on controller .This is there
instruction{U} SHOW STATUS,RETURNS[noparse][[/noparse]POSITION,SPEED,RAMP]
> there is no example for this particular code all other code has an example
so I tried this.
> baud con 396 '2400 baud
> cpos var word
> serout 10,baud,[noparse][[/noparse]"{Q}"] 'SET POS REGISTER TO 0
> GOSUB CKBUSY
> SEROUT 10,BAUD,[noparse][[/noparse]"{U}"] 'OUTPUT DATA FOR STATUS
> SERIN 11,BAUD,CPOS 'READ DATA
> THE Q COMMAND WORKS FINE AND THE SPEED AND DIRECTION COMMANDS WORK FINE I
AM NOT SURE ON HOW TO WRITE THE SERIN AND WHAT KIND OF VAR. I CAN USE.ANY
INFO WOULD BE HELP FULL
>
THANKS MAX
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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