Muller Dynamo

[mariuscivic]

Tudi

Yes i seen mariouscivic ( if i recall corectly ) connecting all coils and stating that he has issues with 2 generator coils. What happened after that ? No idea.

Yes, i had an isue with the two bridge rectifiers of the two pairs of coils. I've changed them and now all coils speed up the rotor. The funny thing is that  my rotor speeds up ONLY when puting a dead short to the total output.With the light bulb doesn,t speed up.

Another thing that i don't understand is:
-when i dead short one pair of gen coils AFTER the ac cap , the rotor sppeds up (loosing a bit of power of the output)
-when i dead short the same pair of gen coils BEFORE the ac cap , the rotor speeds down ( loosing more power of the output)
 
For now i'm building a much smaller dynamo( using HDD rotor) to be able to move freelly the coils all over the rotor to see if there is an hidden sweat spot

[mariuscivic]

And then arrives other questions:

-why did romero used small magnets for triggering one pair of coils?

-why didn't he used the same magnets on the rotor for triggering like i used? ( it work werry good)

-why his rotor has less acceleration with nothing connected to the output?

-why his current is always the same when accelerating and reaching max speed?

i tryed to do 300 turns on the same coil that romeo used but i only managed to do 186 with 0.6mm wire

-how did he did 300 turns with 0.8mm wire?

[mariuscivic]

the left one is 300 turns of 0.4 mm

the right one is 186 turns of 0.6 mm

[gyulasun]

Hi Chris,

Please see Reply #3440 above from a new member 'breakthrough' on the possible explanation of the diode identification and role. (So this diode is not a bemf feedback diode as you called it.) Considering woopy's schematic on the first video setup with the battery:
http://www.overunity.com/index.php?topic=3842.msg289518#msg289518 
I believe it is that diode indeed (if Woopy's schematic and the actual setup matches, this has not been confirmed by Romero).

Re on the near 1A input current: Yes I also found it too much and suggested Romero to insert a resistor (from 470 Ohm to 2.2 kOhm) between Hall device pin 3 and transistor base input pin to limit the base current of the transistor, hence its collector current gets less. See this here too:
http://www.overunity.com/index.php?topic=3842.msg289566#msg289566
Woopy tested this and wrote he found an input current draw reducement indeed (but he was far from even a nearly COP=1 situation back then).
(Romero did not want to change anything on his already working setup to reduce input current (this is understandable).
Re on static biasing question: I do not suppose this diode feedback gives a static biasing because current can only flow via this diode when the induced voltage in the two drive coils is just higher than the battery voltage + this diode voltage drop. This may mean a switched dynamic charging to the battery, the switching happens automatically as per the induction in the driving coils is higher or lower in a given moment than the battery voltage.

Gyula

@gyulasun & all

Thanks for the info. Whilst on this subject of the bemf loop back diode, do you know how and where that diode is connected? Also, does anyone know why Romero's device takes in almost 1A without a load?  In the first video, just starting the motor with the battery with no load. That  seemed an awful lot of current for 2 driving coils and some mA to operate a couple of Hall devices? Is this a clue to sort sort of static biasing?

chrisC

[penno64]

Hi Marius,

-why did romero used small magnets for triggering one pair of coils?

-why didn't he used the same magnets on the rotor for triggering like i used? ( it work werry good)

-why his rotor has less acceleration with nothing connected to the output?

-why his current is always the same when accelerating and reaching max speed?

i tryed to do 300 turns on the same coil that romeo used but i only managed to do 186 with 0.6mm wire

-how did he did 300 turns with 0.8mm wire?

********************************
You are confused with wire size. 7 x .125 does NOT equal .875 - look back through this thread = 0.375

This is how you can get 300 turns per coil.

Use small mags on side to be able to trigger on TDC - you can not fit the hall sensor between rotor
and core/coil

Constant current !  Well, this has still got me beat. I have reduce the unit to 2 pairs drive coils and
1 only pickup (generation) coil. Testing for -

-Gap
-Poles
-Bias magnets - various types and sizes.

With so many testing, one of us has to hit "it" soon.


Penno