stepper motor making weird noises...

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Keiichi.McGuire@gmail.com's Avatar (by Gravatar)Keiichi.McGuire@gmail.com posted on
February 4, 2006, 2:20 am
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So I've finally gotten my unipolar stepper working!
Before it did not work too well, going in random direction, making
funny soundes etc...

So here is what I've observed and am still having problems with.
Currently the only way I can get the motor to go a nice speed is to
ramp it up from maybe 50Hz and then ramping it to a few kHz.  However
in the mid range frequency  the motor starts to make weird nasty
sounds! what could be the reason of this?
also is there a reason why I have to ramp it slowly? I feel like I
should be able to get this guy up and running pretty quickly, am I
wrong? Help!!


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dan michaels's Avatar (by Gravatar)dan michaels posted on
February 4, 2006, 11:42 am
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Re: stepper motor making weird noises...



This sounds about right. Stepper motors always have to be ramped up and
down in a controlled fashion, especially under load, else they will
stall out or start missing missing steps. Motor torque drops off
significantly as step-speed increases. Also, they have various
resonance phenomena, which is what you are observing, and which need to
be addressed based upon the specific situations. Some resonances are
due to the motor alone, and others from the motor in combination with
the load.

There is some good basic material regarding all of this here ... see
fig 2.9, etc ...

http://www.cs.uiowa.edu/~jones/step/physics.html

You can get the thing up and running pretty quickly, but the ramping
rates have to be specifically tuned for the motor and specific load.


- dan michaels
www.oricomtech.com
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