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How to use Stepper Motor as Normal Motor?

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Irshad.mahamood

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Hi,

I have one Stepper Motor with me. I need to use this Stepper Motor as normal motor. ( I mean I do not need any steps when it is rotating, it just needs to rotate as normal motor).

Does any body has some circuits to achieve this?

Thanks.
Irshad
 
Other than rewinding it and putting an armature in then no - you have to use it as a stepper.

If you want it to provide smooth motion without the steps then you need to look at something called microstepping.

Is it a unipolar or bipolar motor ?
 
This would probably be your best bet then - maybe an overkill unless the motor you have is an expensive or high power one.
 
hello sir
i hiren
i want to know that can i start stepper motor from 46 angle ?
please help me
thank you

First: Start your own thread.

Second: Get some help interpreting you question to English. Nobody can understand what you want.
 
I was told by a relatively recent Electrical Engineering grad that powering a stepper motor with a sinusoidal wave form ( I suspect there are other conditions that better define the situation) will allow it to run smoothly and very efficiently as a motor. I have no more knowledge on the subject.
 
Hi,

I have one Stepper Motor with me. I need to use this Stepper Motor as normal motor. ( I mean I do not need any steps when it is rotating, it just needs to rotate as normal motor).

Does any body has some circuits to achieve this?

Thanks.
Irshad


Hi,


The two windings in some stepper motors are physically 90 degrees
apart from one another. This makes it possible i believe to run a
stepper motor from two AC (*NOT* DC) sinusoidal sources that
are 90 degrees out of phase with each other.
Since you need two AC sources that are out of phase with each other
and we usually only have one source available, a possibility would be
to use that one AC source and place a capacitor in series with it
to make the other 90 degree (well not exactly) out of phase source.

I cant give any details of what value the cap would have to be because
it will vary quite a bit with the stepper motor in question, but it will
probably have to be somewhat large and of course non polarized.
You could try several values such as 1uf, 2uf, 10uf, etc., until you
find one that works and still allows the motor to put out enough
torque. You also want to check that the motor doesnt get too hot.

My guess is that a large cap will work because the current will be
close to 90 degrees out of phase with the other AC current phase when
the cap value is large compared to the resistance of the winding.

OF COURSE you have to also watch the peak AC voltage applied too,
so the motor doesnt draw more than its rated current in each phase.

If the windings are not 90 degrees apart in a motor, then you have to
find a value of cap that provides for the right phase shift to match
the motor. This also means a little experimentation with different
value caps so either way you end up trying a few different value caps.
 
Last edited:
The microstepping stepper motor driver kit that picbits mentioned;

This would probably be your best bet then - maybe an overkill unless the motor you have is an expensive or high power one.

Produces an almost sine wave output to the stepper motor windings as the microstep control voltages are smoothed through RC filters, at lower speeds where the RC is tuned anyway. At higher rotating speeds the motor inductance smooths all the steps out nicely, especially when it is microstepped.

That stepper kit has it's own control PIC 16F628A built in and can be used for some motion control tasks, ie like runnign the motor at speed X for time Y etc.
 
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