Muller Dynamo

[smartscarecrow]

Maybe if you really want OU , freedom for the people  we should let this fly under the radar as much as possible at least until the replications come in.

you are of course entitled to your opinion ... I disagree ...

if one person knows something, they are easily silenced ...

if one THOUSAND people know something, the chorus is deafening ...

[nul-points]

a distant relation ...

cool !

hope the discussion is a success

thanks
np

(BTW  if the family still has any more inside history on the development of the coil, we'd be interested to hear it here)


http://docsfreelunch.blogspot.com

[Dave45]

you are of course entitled to your opinion ... I disagree ...

if one person knows something, they are easily silenced ...

if one THOUSAND people know something, the chorus is deafening ...

hmm I see your point as well, I just hope Romero and his family are well, we salute you Ramero, you are a friend to the people a true humanitarian.

[rogla]

...
The diode bridge will prevent the coil from passing current until its voltage exceeds that of the cap. That gets very complicated.

The cycle *may* look something like this:
1. Rotor magnet attracts to the stator coil ferrite pulling it in...maybe...depending on how strong the stator magnet pushes back.
2. The rotor magnet starts inducing a voltage in the stator coil, but initially current does not flow due to the bridge remaining reverse biased.
3. Eventually coil current starts flowing, creating a repulsive field which fights the rotor magnet. The stator magnet is assisting the coil.
4. As the rotor magnet passes over the center of the coil and starts pulling away, the stator coil begins reversing its field. While it does so, it stops conducting while below the cap voltage. The ferrite possibly returns to attraction, fighting the pull out.
5. The stator coil gets to a high enough reversed voltage that it forward biases the bridge and current flows. This will be an attracting field at this point, and will add to the ferrite's attraction, but be in opposition to the stator magnet.
6. The coil stops conducting, ferrite is clear of rotor magnet's field.

Pretty messy. Just for fun, overlap the cycles of 7 coils at different phases. Don't even think about tossing in the drive coil interaction...you'll go mad.
...

I like your post very much LtBolo, very intresting!

This can explain why the coil top magnets is placed a little bit aside from the core center (one of the tunings). Another tuning is to match the coil voltage to the selected cap voltage, maybe the goal is to get the coil to conduct when the coil switches polarity. Then the top magnet should cancel out as much as possible of the drag from the coil and core (without causing drag on approach). Just some speculations...

/Roger

[joao.andrade]

@Joao. I think you're correct. The B-E junction becomes a forward biased junction diode when the rotor is still rotating and until the rotor speed drops significantly, the coils will still half sustain the big Cap? Thanks. Seemed like no mystery and Rom is correct.

cheers
chrisC

Hi chrisC

Also, you can see in the video that at the very moment he turns the switch off, the amperemeter goes to zero or almost zero indication. This means that no power is being fed by the dc2dc converter anymore, meaning that the voltage might have dropped to a certain value that shuts off the driver circuit. But it could be still enough voltage to keep the led on. This would then turn into a 47000uF cap discharging through a 1K resistor in series with a LED. It would take a lot of time to the LED to go off. I did a simple simulation using Circuit Maker and the 47KuF initially charged with 15V took 50S to reach 6V, what still allows a 4.6mA current, enough to keep the led very bright.

Joao