Muller Dynamo

[joefr]

Hi xenomorphlabs

So you control the timing of the shorting/unshorting
with a peak detection circuit or did you couple your drive circuit signals
to the Arduino to time them?

I use Optical switch and big rotor on the left which has 32 trigger points.
The optical switch is connected to arduino input, and with program I controll mosfet driver for coil shorting.


apart from the fact that you would never reach such cap voltages
without the unshorting, it would have been cool to just compare to
a normal generator operation where the cap is connected all the time and
to see the value it fills up to then and also the RPM.

I show this in the first part of the video, the cap is charged to max 38 volts without coil shorting.

Question: How did you connect your generator coils? Series Adding or bucking?
For now Series Adding

Regards JoeFR

[xenomorphlabs]

@JoeFR:

I have never reached such high voltages, i assume you use 3-4 parallel pairs
(like Aviso suggested) of antiserial MOSFETs to reduce the on resistance low enough  to get such spikes? IRF2807 or different?

My pulses are also too long from just the hall, i need to start using an arduino too for that )

[joefr]

Hi xenomorphlabs

For now I am using this mosfet model IRFB5620PbF:
http://docs-europe.electrocomponents.com/webdocs/0dcb/0900766b80dcb1ca.pdf

2 parallel pairs

The Opto switch is this model OPB460T11

http://docs-europe.electrocomponents.com/webdocs/025c/0900766b8025c2fe.pdf


This is the schematic I use for coil shorting but with arduino between opto switch and mosfet driver:

[Cap-Z-ro]

In addition to wattsup said Mo...although I am an inventor in other areas of endeavor, I am not experienced enough in this field to make predictions.

However, I have learned that when dealing with unknown values, sometimes unconventional ideas can lead to other areas of success which may lead to results being better than you initially expected.

Regards...

[gyulasun]

My pulses are also too long from just the hall, i need to start using an arduino too for that )

Xeno,  you could use two reed switches in series connection to shorten the resultant ON time, of course their position should be found out by watching the scope.  Their ON times can be shifted with respect to each other, from the overlap position towards a non-overlapped one, while finding the smallest ON time just before the non-overlapped ON windows.