Muller Dynamo

[e2matrix]

Mu-metal has some amazing properties but before you go melting it you best look into the process it was manufactured as some of these alloys undergo extremely detailed heat treatments to give them the unique properties. So before you go melting it into a big BLOB could easy kill it and produce a magnetic permeability worse than grandmas old iron kitchen sink!

I would agree that melting will probably kill the properties you want.  I've been thinking about cutting them into narrow pieces with a good metal bandsaw.  Either that or I'm trying the metal tape I showed a couple pages back if I can determine it is Mu metal as I suspect.  I'll probably try at least one coil on it if I can't determine it to see how it compares to the ferrite.

[e2matrix]

Hey everybody. Finally decided to acquire a real (but cheap) variable DC power supply for my lab.
Thought you might be interested to know about an Asian built 30vdc, 5amp, power supply with fine tuning, LED display, and test leads for only $80.

It's an Atten Brand model APS3005S currently available through Amazon at: http://amzn.com/B0050FBSRY

It brags of low ripple and noise and the China manufacture's page says it has a "Strong Wind" (Forced Air) cooling system.
And I think LED displays look cool compared to common LCD displays.

Not a bad deal for $79.99 and free shipping.
Most other 30v, 5a, supplies are $100 or more.

}:>

For those who may want something like this for even less consider this.  All you need is a good 12 volt DC wall wort (transformer) that has at least a couple amps or better or an old computer power supply.  Both are very abundant and easily found.  All computer power supplies have a very well regulated 12 volt output (and also commonly 5 volt).  Then just get a DC-DC converter off eBay as many are available that give you both adjustable voltage and current.  You can get them for around $6 to $15 or so and most will go up to around 30 volts and some more.  Much cheaper than $80 to $100+  but the only drawback is you don't have an LED display to see the voltage and current.  I think you can find them but then you already have a volt meter or VOM and so you'll know what it's at anyway.  The heart of most of those DC power supplies is very inexpensive so if you need to save some money to have a variable power supply this can do the job for you.

[skycollection]

Dynamotor or muller replication or romero uk, my motor is based in the same concept, i have 2 circuits for the driver motor and i am building 3 pairs of UNIGEN COILS, they are going to be the PICKUP COILS. i have no results for the moment because i have no the same rotor and the same coils, because i don`t like TO COPY THAT THE OTHER PEOPLE DO...!
I will try to make a dynamo-generator to my way and if the motor works is good, if the motor not work, I AM LEARNING....!
i NEVER GIVE AP, is better to make something, for me is only experimentation....! SALUDOS Y GRACIAS.

[lumen]

Ben,
That is an interesting setup and there seems to be more going on than first appears.

It's like when it's not running the PS DC is flowing through the FWB on the coil and cap setup. This looks to have the effect of causing a bias that eliminates the forward voltage drop through the bridge from the coils view. Whats interesting is that the DC from the PS never flows through the coil, it flows through the FWB as the series cap from the PS would try to charge in reverse if not for the FWB.

It might be good to put another large cap across the PS output just to make sure no ripple is going back into the supply that the meters are not catching. I think Tinu mentioned this and I have seen this happen before. So the PS capacitor would eliminate this possible error.

Because the current through the system is the same as what is used by the system but yet it may be possible to output this same current out but at a higher voltage (more watts) so I seems you could be on to something here and even a possible loop condition.

Interesting connection.
I'm sure you will sort it out and keep us updated.

[k4zep]

Ben,
That is an interesting setup and there seems to be more going on than first appears.

It's like when it's not running the PS DC is flowing through the FWB on the coil and cap setup. This looks to have the effect of causing a bias that eliminates the forward voltage drop through the bridge from the coils view. Whats interesting is that the DC from the PS never flows through the coil, it flows through the FWB as the series cap from the PS would try to charge in reverse if not for the FWB.

It might be good to put another large cap across the PS output just to make sure no ripple is going back into the supply that the meters are not catching. I think Tinu mentioned this and I have seen this happen before. So the PS capacitor would eliminate this possible error.

Because the current through the system is the same as what is used by the system but yet it may be possible to output this same current out but at a higher voltage (more watts) so I seems you could be on to something here and even a possible loop condition.

Interesting connection.
I'm sure you will sort it out and keep us updated.

Hi Lumen and all,

Added another coil pair tonight, and discovered the added inductance totally threw the tuning off.  As my coil resistance is fairly high,
while I have about 18 VDC output @ 2800 rpm but no sweet spot over the whole RPM range.  I only have about 1/2 the current needed.  I don't know now if one additional coil will put me over the hump or not as there is no sweet spot. Tried the old 1 coil pair in parallel and the effect is there with it. So many things to check, try.........The devil is in the fine points here........  I have a bunch of things to check, got to get out the freq. gen. and see if this thing is truly resonant at a certain RPM and so on and so on.......It's late here, had a long day, going to bed, start again in the morning.  I"m not grumbling, just tired.......NIght all.

Will put a large 68000 uf in parallel with the power supply to stabilize it......good suggestion.

See ya all tomorrow. 

Respectfully
Ben K4ZEP