Muller Dynamo

[Artist_Guy]

I have the same generic model as 4Tesla pointed out above. Only misgiving I have is that the RPM reading will only displayed (again) after you release the test button and press the Mem. button to see the lowest, fastest and stable speed. But you can't beat the price indeed. I paid less than $25.

chrisC

Laser Tachometer search on ebay yields a lot of these.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=180583063718

Looks the same, $11.85 shipped, ebay. (Just ordered one). Comes with some of the reflective tape. I usually get stuff from HK in 10-12 days. AG

[4Tesla]

I was wondering if anyone has tried the ferrite core in the C or D configuration.. if so, what were your results?

Thanks

[bolt]

Put a 1 ohm resistor in series with the coil to measure the current. Put scope leads over the resistor. The current is the trick everyone so far is measuring the voltage!!!

SHORT out the DC side of the bridge.

Bring the rotor up to medium speed say 1500 rpm

Then put a cap in series with the coil  and the AC leg of the diode bridge and try of lots of values and tune so that the  when the load is a dead short the current is out of phase with the voltage as the pulses hit the coil.  You will find around 10uf to 100uf in series of coil will force out of phase most of your coils pending total inductance. When you get close fine tune the backend magnet as this changes the inductance.

Now watch your scope! you will get that perfect waveform with critical tuning. Requires EXPERT RF tuning to get this right. Then you are almost there to release the short circuit on the DC side of the bridge and let the power out to the dump cap. Then tweak the backends magnets again changes the inductance to suit the load.

I repeat when tuning to ZPE you tune into a short circuit condition which drops the input current to almost ZERO!!!

If there is no current into a short circuit there is no LUGGING.

Now repeat the process for every coil individually.  When all the coils are tuned in this manor then fine tuned to load the rotor will speed up when shorted and is very slightly detuned into the running  load which has a resistance greater than zero. The  overall tuning effect is slope modulation.

Anyone remember Thane HV coil test on his generator?  He realised a HV coil doesn't lug. He thought this  was just a voltage issue but in fact its because he had a large inductance and small self capacitance creates VARS and no lugging thus his rotor went faster. You can have a thick wire coil with large inductive iron core and compensate using a bank of caps does the same thing see Youtube 900 watt Thrapp generator.

Compare my tuning suggestions to RomeroUK's Scope shot.

Anyone tuned up as i suggested yet?  Compare scope shots.

[toranarod]

Put a 1 ohm resistor in series with the coil to measure the current. Put scope leads over the resistor. The current is the trick everyone so far is measuring the voltage!!!

SHORT out the DC side of the bridge.

Bring the rotor up to medium speed say 1500 rpm

Then put a cap in series with the coil  and the AC leg of the diode bridge and try of lots of values and tune so that the  when the load is a dead short the current is out of phase with the voltage as the pulses hit the coil.  If your coils are not a perfect inductance match you can tune them with caps. You will find around 10uf to 100uf in series of coil will force out of phase most of your coils pending total inductance. When you get close fine tune the backend magnet as this changes  inductance but be careful not to saturate the core with neos that are too powerful.

Now watch your scope! you will get that perfect waveform with critical tuning. Requires EXPERT RF tuning to get this right. Then you are almost there to release the short circuit on the DC side of the bridge and let the power out to the dump cap. Then tweak the backends magnets again changes the inductance to suit the load.

I repeat when tuning to ZPE you tune into a short circuit condition which drops the input current to almost ZERO!!!

If there is no current into a short circuit there is no LUGGING.

Now repeat the process for every coil individually.  When all the coils are tuned in this manor then fine tuned to load the rotor will speed up when shorted and is very slightly detuned into the running  load which has a resistance greater than zero. The  overall tuning effect is slope modulation.

Anyone remember Thane HV coil test on his generator?  He realised a HV coil doesn't lug. He thought this  was just a voltage issue but in fact its because he had a large inductance and small self capacitance creates VARS and no lugging thus his rotor went faster. You can have a thick wire coil with large inductive iron core and compensate using a bank of caps does the same thing see Youtube 900 watt Thrapp generator.

Compare my tuning suggestions to RomeroUK's Scope shot.

Nice work

put the capacitor here is that correct?

the !.5 uf in the schematic is the one you are referring to?

[toranarod]

I just just reversed the wires on the top coil.  The effect is really neat.  Until I added the additional magnets I thought the there was no power generated in this config at all.

Check out what MileHigh has to say about this effet over on the other forum:

nice work

did this a few days ago with the drive coils looks like it works with the Gen coils

During recent tests I was pondering the possibility of using two paired sets of drive coils all wired in series configuration to be driven from the one pick up sensor.
As seen in the picture below, drive coils pair 1 is magnetically aligned to attract the magnets on the rotor disk. Drive coils pair 2 is magnetically aligned to repel the magnets on the rotor disk. This meant drive coils 1 and 2 would be wired in series to double overall inductance and coil resistance, consequently halving their power consumption. In turn this would give us the opportunity to create a repelling and attracting force simultaneously to the rotor disk.
The only technical issue with this configuration was working out the phase of the two coil pairs, so that when they engaged they did not electrically oppose each other in circuit.
This is where it got interesting…I experimented with the coils in phase with each other and out of phase with each other. When the two drive coil pairs generated a charge induced by the magnets and the polarity of the charge was in opposition to itself, drive current dropped to 25 m Amps. Motor RPM was 1250. When I reversed the phase of the two coils motor RPM increased to 2200, drive current escalated to 180 m Amps.
I found this to be a very interesting result and something that needs a lot more work. I am posting this result in the hope that others may replicate this experiment and refine the technique.