Muller Dynamo

[scratchrobot]

@Arthurs . I am not sure that I fully understand your last post . your second sentence reads "We do not walk the wrong road ." From that I assume we are walking the right road . I suspect you could well be right in that coil shorting can only increase the voltage and not the power , but this is NOT based on my own experiments .
     However , as I understand it , coil shorting has other benefits , delaying the Back EMF so that it actually ads to the motors effect rather than causing back drag . That is a benefit in itself .

Only one person knows but he can not tell us, we have to waste more time and money ourselves 
Instead I would rather work on improving the concept or build a solid state version.

http://www.youtube.com/watch?v=cuhZ5ipW31U

Regards,
scratchrobot

[teslaalset]

Don't forget, using the rectifier and a big buffer capacitor does a pretty good job in approaching shorting the coils when the induced coil voltage is passing 2 times the diode threshold voltage + Capacitor voltage.
In case the rotation speed is sufficiently high, the capacitor impedance is also very low.
In that situation the diode resistance is dV_diode/dI_diode, which is a near shortage.
So, I am not sure I understand all the fuzz about extra shortening circuits to be honest.

[edit]
In case some of you would like to persist using extra shortening circuits, keep in mind that ultra short pulses will not do anything extra.
You need a decent period of shortening.
In that case, how would you like to collect energy from a shortened coil? It will only waste energy through heating up the coil.
The extra gain you get from delayed BEMF will already be lost in the coil presumably.

[scratchrobot]

It is Arduino Duemilanove board. And I am using one mosfet IRF610 to switch the coils. The meter is on the input side so that I can see in detail what is going on.

Fausto.

I have a board like that and maybe try it on my motor also, can you show me how to connect it to the mosfets and driving coils and maybe how to connect a hall sensor to the arduino?

http://www.youtube.com/watch?v=7ZFIMqA0Vpc

Regards,
scratchrobot

[gyulasun]

....

http://www.youtube.com/watch?v=cuhZ5ipW31U

You seem to be doing fine with the rotary version, solid-state version can come later when we can master rotary version...

How your input power (current) changes when you turn the back magnets and RPM goes up?

Thanks,  Gyula

[scratchrobot]

I have to agree with Neptune.
Don't forget, using the rectifier and a big buffer capacitor does a pretty good job in approaching shorting the coils when the induced coil voltage is passing 2 times the diode threshold voltage + Capacitor voltage.
In case the rotation speed is sufficient high, so the capacitor impedance is also very low.
In that situation the diode resistance is dV_diode/dI_diode, which is a near shortage.
So, I am not sure I understand all the fuzz about extra shortening circuits to be honest.

I agree I think there has to be some sort of self shortening effect goeing on like you describe!
When I see the Kromrey converter I also see no shorting circuit but a constand 100% short.

Regards,
scratchrobot