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Author Topic: Homopolar Generators (N-Machine) by Bruce de Palma  (Read 244951 times)

Offline mscoffman

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #345 on: April 15, 2015, 02:08:42 AM »

When I spun it I ago no measurable AC output.  This is consistent with what I saw when trying to close the flux
thru disc previously in disc style AC test. 

I have one more test to do with closed flux in dc config to confirm but it is looking like this only may work if The brush cct cuts the return flux from magnet.  Interesting because that portion of cct is what would experience the back torque due to Lorenz force.  More to come! 

-boots



Boots,

I hate to tell you this but in a homopolar dynamo there is no AC signal generated. One way to get AC would be vary the speed
of rotor rotation - fix with a flywheel.

In the classic definition of a homopolar dynamo only *one* pole of a magnet completely covers the generator disk including slightly
over the edges. Electrons are pushed to the edge of the disk via centrifugal force so you can tell if you are homopolaring
because rotating the rotor in the opposite direction causes the electrons to wind up in the same place on the edge
collectors outside the disk. Thefore polarity will not reverse with reversal of rotor rotation.

If your disk gets covered by two magnetic poles you may have a "single turn rotor" dynamo which in not homopolar.
Use some of that coated plastic to visualize the n/s fields.

Note that neodymium magnets are often not optimal to use because the opposite poles can push through between magnets
this is not acceptable in a homopolar device as they simply cause eddy currents. So an optimal homopolar
device would consist of a giant "C" of magnet material as part of the magnetic flux path. A plane of neodymium magnets
would be very tough to use to get a pole face consistent. You will not be able to have flux paths bouncing around
inside your device.

 
   



Free Energy | searching for free energy and discussing free energy


Offline Real Boots

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #346 on: April 15, 2015, 03:42:49 AM »
Picture of magnet/inner assembly minus outer copper tube and center outer steel pipe piece.  The small copper ring is just to hold magnets together while copper tube is off and slides off when copper pipe is slid ocer the entire thing. 

Offline Real Boots

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #347 on: April 15, 2015, 03:54:21 AM »
@mscoffman, the AC test was to see if it would work as there is some talk out there claiming it is purely relative motion between the brush locations giving the voltage... i think I have now proved that is not the case, more complex than that.  With the magnet setup shown with all n poles facing out wards it DOES produce a nice dc voltage as observed by my scope, I run a magnet n pole few inches away all around the assembly and the repulsive force seems even and not choppy, the magnets are very difficult to get in there as they repel strongly so appears that the individual fields are merging so it is very similar to the field that would be formed by two large cylinder magnets repelling at faces as per usual drum style homopolar configurations.
More tests to come, just upgraded rotation assembly with bigger motor to run at 3440rpm.
-boots

Free Energy | searching for free energy and discussing free energy

Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #347 on: April 15, 2015, 03:54:21 AM »
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Offline gravityblock

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #348 on: April 15, 2015, 05:18:17 AM »

Boots,

I hate to tell you this but in a homopolar dynamo there is no AC signal generated. One way to get AC would be vary the speed
of rotor rotation - fix with a flywheel.

In the classic definition of a homopolar dynamo only *one* pole of a magnet completely covers the generator disk including slightly
over the edges. Electrons are pushed to the edge of the disk via centrifugal force so you can tell if you are homopolaring
because rotating the rotor in the opposite direction causes the electrons to wind up in the same place on the edge
collectors outside the disk. Thefore polarity will not reverse with reversal of rotor rotation.

If your disk gets covered by two magnetic poles you may have a "single turn rotor" dynamo which in not homopolar.
Use some of that coated plastic to visualize the n/s fields.

Note that neodymium magnets are often not optimal to use because the opposite poles can push through between magnets
this is not acceptable in a homopolar device as they simply cause eddy currents. So an optimal homopolar
device would consist of a giant "C" of magnet material as part of the magnetic flux path. A plane of neodymium magnets
would be very tough to use to get a pole face consistent. You will not be able to have flux paths bouncing around
inside your device.

 
 


Polarity does reverse with reversal of rotor rotation (starting at 3m30s of this video by Lumen, we can see what I'm saying is correct, https://www.youtube.com/watch?v=XSWwrvT_c8w ).  Likewise, rotor rotation does reverse with reversal of polarity.  In addition to this,  the electrons can flow from axis to rim (centrifugal) or from rim to axis (centrepital) depending on polarity of current and the pole face.  Also, a diametrical current (rim to rim) can be used in a logarithmic spiral configuration by using CW spirals on one half of the disc and CCW spirals on the other half of the disc, or by having two discs counter rotating.


Neo magnets don't induce eddy currents.  A disc with a much larger diameter than the magnet will induce eddy currents because portions of the disc will be cut twice by the field in opposite directions.


Confined fields is another promising area of research and experimentation.


Gravock

Offline mscoffman

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #349 on: April 15, 2015, 04:58:15 PM »
Gravok,

You are translating the geometry of the *homopolar* machine incorrectly! That ring is obviously going to see multiple magnetic pole
polarities where current flows, ie it is not homopolar. I don't care if some main names used this geometery it's an incorrect translation.
It's not only neo's you can't use a face geometry where poles can push through the face short circuiting long range magnetic flow path.
There is a video on youtube with a person using a plastic sheet on a neodymium magnet plane to visualize what happens, opposite poles
push through the compressed spaces between magnets. This on the flat, imagine what happens when magnets are mounted with an angle
to one another. The only way around this is to have a large low reluctance magnet flow path to get the opposite polarity well away.
Having multiple magnetic pole on one disc will indeed cause an eddy current loop.

Also while mixing centripetal and centrifugal forces is creative, it is also incorrect. *Only the low mass electrons have mobility, so
only electrons will move towards the edge of the disk*.  The positive polarity elements are all bond together as part disc mechanical
structure.

I know you wrong, because always having the same polarity on the outside of the disk is a major disadvantage for wiring multiple
discs together in series, the homopolar machine has that disadvantage. Thinking you can wire LV current from one disc to another
without traversing a magnetic field first is just wishful thinking. -> Try using rotating power conversion, if you have that problem.

https://farm9.staticflickr.com/8619/15368446833_1b18206b47_b.jpg

I know it's clunky, but that's nature. BTW I haven't reviewed the free energy experimental designs for this kind of problem because
those folks are often dunderheads.

.S.MarkSCoffman


Free Energy | searching for free energy and discussing free energy

Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #349 on: April 15, 2015, 04:58:15 PM »
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Offline Real Boots

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Re: Homopolar Generators (N-Machine) by Bruce de Palma
« Reply #350 on: April 15, 2015, 08:47:51 PM »
Update:  Spun this thing with the coper pope over it at 3400rpm and am getting max output of 39mV. 
That's much better than previous low speed test that was in the 12 to 14mv range which was around 1400rpm. 
Next experiment is trying to close the flux back through cutouts in the tube semi-symmetrical......not sure if I will get any output voltage at all but worth a try. 
The center portion will stay the same but instead of the return flux going out in space then back through the tube symetrically it will be concentrated in 4 places where there will be holes cut in the copper.....pics to come when I finish the mods to the copper and steel outer portions of the assembly. 
Not sure if it will work because portion of the mag field will no longer be symmetrical so the field may now rotate with the rotor and generate no voltage??
-Boots

 

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