Shorting coil gives back more power

[gyulasun]

Hi Joe,

It is possible the mechanical setup as a whole you happen to use has got the inherent 'property' of not letting the control pulses be shorter... maybe you wish to use a small reed switch instead of the Hall to control the 4421 as a last test in this respect.  Of course this is up to you, likewise if you really wish to build another setup and not wanting to explore further behaviors of the present one like changing series capacitors, several reed switches in series like Romero mentioned for getting narrower shorting time etc.
Unfortunately I cannot answer your questions on the number of  magnets, or the type of magnets, sorry.

Keep up the good work.

Gyula

Hi Gyula

I tested today the coil shorting with circuit which is using only hall sensor and mosfet ( without TC4421 driver ).
I got the exactly same result, the coil is shorted too long.
So I am thinking that this wheel setup is not good for testing coil shorting, because trigger magnets are positioned on inside part of the wheel.
I put smaller trigger magnets as showed in the video, but because they spin slower the result is almost the same that before I used generator magnets to trigger.

So i will build the new wheel, something in this way at the bottom photo:

I ask this two questions in previous post and I ask for suggestion if anyone has more experience with this:
I will be using 8 coils but I need proposal what will be better to use 7 magnet, 8 magnets or 9 magnets?

And what diameter size of bottom magnets would be fine for good power generation with coil shorting (charging caps with spikes and then dump to battery ):
1. http://www.supermagnete.de/eng/S-20-10-N
2. http://www.supermagnete.de/eng/S-30-10-N
3. http://www.supermagnete.de/eng/S-35-05-N
4. http://www.supermagnete.de/eng/S-60-05-N

Joe

[Magluvin]

Hi Gyula

I tested today the coil shorting with circuit which is using only hall sensor and mosfet ( without TC4421 driver ).
I got the exactly same result, the coil is shorted too long.
So I am thinking that this wheel setup is not good for testing coil shorting, because trigger magnets are positioned on inside part of the wheel.
I put smaller trigger magnets as showed in the video, but because they spin slower the result is almost the same that before I used generator magnets to trigger.

So i will build the new wheel, something in this way at the bottom photo:

I ask this two questions in previous post and I ask for suggestion if anyone has more experience with this:
I will be using 8 coils but I need proposal what will be better to use 7 magnet, 8 magnets or 9 magnets?

And what diameter size of bottom magnets would be fine for good power generation with coil shorting (charging caps with spikes and then dump to battery ):
1. http://www.supermagnete.de/eng/S-20-10-N
2. http://www.supermagnete.de/eng/S-30-10-N
3. http://www.supermagnete.de/eng/S-35-05-N
4. http://www.supermagnete.de/eng/S-60-05-N

Joe

Maybe optical sensors would be more exacting.  I have found that magnets, even from the same batch can be a bit different from one another. Ive been able to adjust my reeds away from the rotor just enough that just one of the 16 magnets activate the reed. The same may go for hall sensors. But optical will be as exact as the positions set for the sensor to read.  Most printers have optical wheels that it is hard to even see the gaps in the wheel. So timing on/off can be made absolutely predictable.  =]

Mags

[Thaelin]

   If you want to go with optical trigger, I know a place that has N type optical transistors and they will work very well with either laser pointer or hi output  leds. I just got 30 of them for $.95 each. You can order on line as well.   Try at Surplus Gizmo's. They have say a couple a thousand of them.

thay

[Tito L. Oracion]

off course shorting coil gives more back power because of the input and the effect of the input, and it gives back more power depends on material and the design you make, they will all contribute for addition. 

just crossing    

[joefr]

Hi Mags
Maybe optical sensors would be more exacting
This is great idea thanks.

Hi Thay
Can you please post a link to this N type optical transistors.

Joe