How can I do this? Random speed control on stepper motor. - Electrician Talk - Professional Electrical Contractors Forum
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Old 08-29-2013, 01:10 AM   #1
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Default How can I do this? Random speed control on stepper motor.


In the video below, the user has four stepper motors that he/she is controlling at random speeds. I want to do exactly what's in the video(though maybe a tiny bit faster than the motors in the video) and only with one motor.

I want my motors speed to be controlled randomly as it is done in the video. Basically, I just want to be able to have a stepper motor, plug it in(or use a battery), and have it's speed be randomized. Can anyone tell me how this is done? I just want what's in the video(unless there is just a guy off-camera controlling the speed of the motors himself! lol)

Also, could someone tell me what kind of stepper motors he's using so I can get one just like it(or like I said, a tiny bit faster?).

One more thing, I always see people using battery/battery packs with these. Can you not plug them into the wall outlets? If so, is it as simple as wiring a plug onto it?

Thanks so much for any help!!!

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Old 08-29-2013, 01:13 AM   #2
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sorry, I forgot to ask.... What all will I need for this? Especially to randomize the speed? Thanks!!
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Old 08-29-2013, 05:47 AM   #3
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You will need something with some level of intelligence, such a PLC or other microprocessor based controller, like an Arduino (if you are a decent propeller head). With a PLC that has a "random number generator" as a canned function, you can use that to create numerical values that you then plug into registers that load velocity commands into the stepper controller. In something like the Arduino, you would have to create your own random number generator, but likely there are others that have done it and will allow you to use it, a lot of Arduino stuff is open source.

A lower tech version would be to use a cheaper simpler PLC pr Smart Relay to just program a repeating series of stepped velocity commands in a timed string. Most people cannot detect repeating patterns beyon a certain number of steps and will perceive it as random. I did that with a "dancing waters" fountain once, 5 steps and most observes could recognize the pattern, 9 steps and most could not. We tend to have short attention spans.
"If you don't know where you're going, then any direction will do." -- Lewis Carroll
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Old 08-29-2013, 01:46 PM   #4
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Those motors look like they are all following the exact command? Not sequencing. Following.
They don't look independent to me.

Any decent inverter or servo control can be told to follow another control with a twisted pair and a few programming entries.

One control, drive can be the master of many other controls. This is what I see in the video.
I did not listen, I just watched.
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