Muller Dynamo

[mondrasek]

Just made a tesla-bifilar out of Litz wire and noticed that the resistance
does not double in comparison to the same coil connected "normally" as i had posted earlier. It shows only a slight increase, which actually makes sense because still the same length of wire is being used no matter how you connect it.
But the inductance has quadrupled (!)

So Mondrasek, this is what you talk about increasing the inductance while minimizing resistance

Very interesting! Can you describe exactly the type of Litz you are using?  Exact inductance and resistance measurements before and after?

Anyone else care to reproduce this test?  I have no Litz on hand.

M.

[xenomorphlabs]

Very interesting! Can you describe exactly the type of Litz you are using?  Exact inductance and resistance measurements before and after?

Anyone else care to reproduce this test?  I have no Litz on hand.

M.

Like Chalamadad said the number of turns goes into the inductance with a power of 2.
I currently use a big ferrite rod, so my coil proportions differ from the sewing bobbin types.
Unifilar: Resistance: 16 Ohm   Inductance: 1.95mH
Bifilar: Resistance : 17.9 Ohm Inductance : 8.42 mH

Litz wire is 15x 0.1mm Block Trafo CLI 200/15   FA-NR.: 40008

The coil also creates some funny waveforms (Green Voltage Yellow Current)
Edit: That is with caps in the circuit though, just to point that out.

[mondrasek]

Eureka!

I adjusted my rig again to bring the o/p voltage a little higher by moving the output coils closer to the rotor.  I aimed for 10 V ptp on a single coil.  But I may have over shot a bit.  Unloaded max dump cap voltage was 9.85 V, which is a bit higher than was expected.  But as I moved the coils closer to the rotor I have more variation in the wave forms, and also I had to switch down the V/div seen on the scope, thus lowering my screen "resolution".  So harder to adjust to an exact V o/p.

I began running the same series of output tests by attaching the same resistor loads to the output cap.

When I got to the smallest resistance test (49.1 Ohms), I noticed a curious thing.  I could not get stable readings on the Vout, because every time I would touch the DMM probes to the load I would see a rising voltage.  And then I realized that I was also hearing an increase in RPM!

I confirmed the increase in RPM with the laser tach.

I then wanted to see the wave forms but found that attaching my o-scope ground also caused the RPM to start increasing.

So please let me know what a load "sees" when a DMM set to read voltage is exposing.  Also, what does only the ground from an o-scope probe do to affect anything?

I tired dropping the load Ohmage further and found the usual RPM drop.  But then I added a 1 Ohm precision current shunt (resistor) in series to increase my load by just 1 Ohm and saw an RPM rise.

49.1 Ohm (measured) Load = 1835 RPM (I cannot measure other values without causing the RPM to change)

49.1 + 1 Ohm Load = 1841 RPM  Vin 14.96, Iin .407, Vout 5.22

I am thinking I need more 1 Ohm or less resistors to drill down deeper into this find.

Also, I was about at the limits of my resistor's power capacity.  They are 1/2W units and several combos were quite hot at this o/p power level.  So I need something that can handle higher power output as an adjustable load if I am to continue with this line of testing.

Gyula (or anyone else), do you have any better load suggestions?

Thanks,

M.

[xenomorphlabs]

Slider has advanced the Tesla bifilar to a trifilar now, which should give a 9 times higher inductance even:
http://www.youtube.com/watch?v=5esymgpAsd4
http://www.energeticforum.com/renewable-energy/7982-muller-generator-replication-romerouk-28.html#post147298

@Mondrasek:

I don't know what kind of scope you are using, but if it's a USB-type
DSO scope try disconnecting the AC plug from the PC/laptop.
It can give you funny readings. I had like 20 Volt P2P coil voltage waveforms when i touched the coil physically (groundloop).

You might not need more than 7 Volt per coil.
The voltage might add up when you parallel multiple coils, the effect reported earlier when adding many coils.

When you have your final coil figured out, try Plengo's series cap circuit.
It works, i tested it and the rotor does not slow down when the load gets connected.

[David70]

Eureka!

I adjusted my rig again to bring the o/p voltage a little higher by moving the output coils closer to the rotor.  I aimed for 10 V ptp on a single coil.  But I may have over shot a bit.  Unloaded max dump cap voltage was 9.85 V, which is a bit higher than was expected.  But as I moved the coils closer to the rotor I have more variation in the wave forms, and also I had to switch down the V/div seen on the scope, thus lowering my screen "resolution".  So harder to adjust to an exact V o/p.

I began running the same series of output tests by attaching the same resistor loads to the output cap.

When I got to the smallest resistance test (49.1 Ohms), I noticed a curious thing.  I could not get stable readings on the Vout, because every time I would touch the DMM probes to the load I would see a rising voltage.  And then I realized that I was also hearing an increase in RPM!

I confirmed the increase in RPM with the laser tach.

I then wanted to see the wave forms but found that attaching my o-scope ground also caused the RPM to start increasing.

So please let me know what a load "sees" when a DMM set to read voltage is exposing.  Also, what does only the ground from an o-scope probe do to affect anything?

I tired dropping the load Ohmage further and found the usual RPM drop.  But then I added a 1 Ohm precision current shunt (resistor) in series to increase my load by just 1 Ohm and saw an RPM rise.

49.1 Ohm (measured) Load = 1835 RPM (I cannot measure other values without causing the RPM to change)

49.1 + 1 Ohm Load = 1841 RPM  Vin 14.96, Iin .407, Vout 5.22

I am thinking I need more 1 Ohm or less resistors to drill down deeper into this find.

Also, I was about at the limits of my resistor's power capacity.  They are 1/2W units and several combos were quite hot at this o/p power level.  So I need something that can handle higher power output as an adjustable load if I am to continue with this line of testing.

Gyula (or anyone else), do you have any better load suggestions?

Thanks,

M.

can you try to measure if you get any voltage between earth ground and different points from your device?I just remembered now after seeing your post that Romero told me that the ground will have a big influence on the device when tuned properly.Maybe attaching one of the core ends to the ground will show something.At the time I did't pay too much attention but maybe there is something.
I don't get anything in my case maybe you do.
please let me know, this sounds interesting.
David