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  #1  
Old 03-16-2011, 07:31 AM
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kcarring kcarring is offline
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Milkovic Pendulum Powered Step Motor Generator

While I do not think this may be the highest power producing concept of all ideas out there... I've yet to see someone try it, and on a small scale these motors are very easy to come by, free. There is one (not as shown, but indeed a low speed torque motor) in every scanner. I recently got an excellent one in a all-in-one laser,scanner,fax combo machines. In my town at least, this stuff is easy to get, it's everywhere. It barely costs anything new, and one damaged or even outdated, it's worth nothing at all. I have got 15 scanner/printers for $0.

So I have started this thread because there are several Milkovic spin off designs, power function concepts... and I don't want to infiltrate other great threads... this one is just for the step motor concept, and here it is:



Everything is fixed. The stepmotor, the auxillary large blue gear's center rotational point - the overhead support for the return spring, all solidly put in place. The only things that move are the Milkovic hammer, the blue gear, and thus the drive gear on the step motor.

Step motors are 4 phase. I know from testing, it only takes a small amount of rotation to produce current. For example, you can attach 40 LEDs to a small step motor and spin the wheel back and forth and easily illuminate all of the LEDs without a problem. i did it and I may have only been using one half of one phase, cause I only had one hot wire and it wasn't even rectified. If you use all phases rectified, can u produce enough juice to oscillate and pulse a bifilar coil to perpetuate the pendulum Bob? I wouldn't doubt it. Interestesting cheap little experiment I'd like to try.

Shown is a more expensive Step motor.

To determine if a step motor has any current potential, simply short the leads out, against one another and turn the gear. If you can feel quite a substantial difference in the difficulty to turn the main gear, your step motor has some power to it.
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  #2  
Old 03-16-2011, 07:56 AM
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General Construction

Correct me if i am wrong, because I have not built one of these things yet, but my brain tells me Mass A should = Mass B at rest. That way when the pendulum offsets the entire hammer rocks forward, and when it swings backward past the centerline, it offsets the motion, thus raising the hammer past equilibrium.

I also propose that if "mass matters" that the entire thing be made first of a wood form, and filled with concrete and rebar. The pivot point could be as simple as a pipe of a known inside diameter (set into the cured concrete) - that a greased rod of cold rolled steel can "just" slip inside of. The stand would then be attached to the cold rolled steel rod and thus form a pivot point. Make it heavy and it shall do some work, is my thought.

I also propose that the overall length be quite long. Longer than what i see constructed by the brilliant inventor, himself. The thought here is that the longer the portions (halves, as shown) are, the longer the travel path created at the far end (business end) and thus the greater the upward/downward (arc travel). this will give a longer pulse of electricity, and the general overall length given a similar width, will increase mass/power.

That's how I think of it, but if I'm wrong, explain why. Thanks

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Last edited by kcarring; 03-16-2011 at 08:04 AM. Reason: fix
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Old 03-16-2011, 08:10 PM
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142857 142857 is offline
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depends on what you are trying to do...mass does matter in different ways.

most importantly the bigger you build it the more power you put in to swing the pendulum.

I prefer to tune the machine to oscillate "correctly" with no work then add the work/weight and counter balance it to the point where the oscillations are what they were with no work being done .....then you wind up adding mass to the pendulum end...not the pendulum, just that end of the stick.

I reality, without some adjustability you really need to design one of these specifically for the work you want it to do so that it can balance and resonate properly.

the counterweight method seems to me to be the easiest way to make it adjustable to the work you want it to do....

....mine can bounce/pump a single weight on the work end....or can be counterweighted to to bounce five of the same weights at roughly the same oscillation as it did with one...
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Old 03-17-2011, 07:51 PM
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Step Motor

I tried the step motor back and forth rotation it works. Why not have a gear
strip going up and down to the gear on the step motor. Like rack and pinon.
You could have multiple motors this way, like 142857's multiple coil idea.

FRC
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Old 03-18-2011, 06:07 AM
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Quote:
Originally Posted by FRC View Post
I tried the step motor back and forth rotation it works. Why not have a gear
strip going up and down to the gear on the step motor. Like rack and pinon.
You could have multiple motors this way, like 142857's multiple coil idea.

FRC
The large wheel as shown offers a better turn ratio against the small step motor drive wheel. The big blue one is a secondary, not the primary, is what i am saying. For each partial turn of the large wheel, several revolutions on the small one occur.
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Old 03-18-2011, 06:42 PM
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Was looking at my setup and thinking about your step motors....

I have a scanner motor too.....looking at it and my pendulum I realized that at the size I built mine, you could actually use a pair of those as the pivot berrings .... you wouldn't get much motion out of them but...you could do it.
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Old 03-18-2011, 09:57 PM
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142857

That would be a good way to get a little extra charge.

FRC
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Old 03-18-2011, 11:46 PM
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Quote:
Originally Posted by 142857 View Post
Was looking at my setup and thinking about your step motors....

I have a scanner motor too.....looking at it and my pendulum I realized that at the size I built mine, you could actually use a pair of those as the pivot berrings .... you wouldn't get much motion out of them but...you could do it.
I agree, it could be done. In another thread Aaron had some concepts of putting the power production at the pivot point, as well... but... as i understand it, if you take energy away from the system, -there- I believe you will be shooting yourself in the foot. It's not a point of leverage, and, you'll be slowing the hammer end down, adding friction. it'd be like cutting your shovel or pry bar shorter, I don't think it'll be advantageous.

On that note, though... I don't think this is "the way" to make power from a two stage oscillator... rather I think it's a quick and dirty way to play with making power from a two stage oscillator. I think if you take the hammer end, and have it drive a tall, longitudinal shaft (schedule 40 or 80 pvc pipe) that has magnets loaded into the sides of the pipe... and then have that pipe slip freely inside of another pipe (which has coils, loaded in it's sides...) - THEN you'll have maximum power production. I see this as maximizing the output, simple, because in this manner, you'll be able to:

1. Have the generator be as long as you wish it to be. If you desire a larger generator, the pendulum two stage oscillator need only be lifted higher in the air.
2. Experiment with pushing the system to its absolute potential - a long generator can be fashioned, and shortened (magnet and coil sections removed) until a balance is reached, wherein the hammer effect is still able to pass the magnets past the coils during Max Lenz periods.

The process will be linear and lose nothing to gear ratios. The voltage will be set by the guage of wire and thus the turn ratio, as will the current. Each down stroke would be one phase, each upstroke powered by a return spring will be the alternate phase, so it will be 2 phase AC power. The frequency will be low so capacitance will be needed, but if the machine is powerful each pulse could deliver (potentially) high current.
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Last edited by kcarring; 03-18-2011 at 11:54 PM. Reason: add
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