Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[woopy]

Salut Luc

Merci pour ta réponse en français, ça fait toujours plaisir. Et on semble être d'accord sur beaucoup de points sur ce fil.

Hi Mag and Gyula

just for info i have tried much bigger magnets and also inserting magnets inside the air core coils and the current seems not to be very much affected even as i feel a strong permanent and wobling attraction ??

Hi Shylo
yes i have tried to place a diamagnetic round cylinder magnets , and when it spin at the right speed, it Kicks in and  rotates as a rotor. When it rotates , the current is very slightly lower.

Hi Verpies
Thank's for your info, just a question, could you please explain precisely what happens when the magnetic field collapse, i mean how is the process of the creation of the strong negative voltage in the wires. Perhaps some videos ?
I ask this because i am not satisfied with the flywheel explanation by Milehigh, i need to "see" the "mecanics " as you did in your graph for the creation of the magnetic field.
I also ask it because today i have replaced the reed by a hall sensor and a transistor so i can get a much shorter "on time " for the main coil, in order to stay as near as the 0.58 TAU. And it seems that by drawing far less current , the flyback spike stays almost at the same amplitude (all this to be checked of course)

Thank's to all of you for your suport

laurent

[madddann]

Hello everyone, Hello Gotoluc!

I've been reading this thread from day 1, and after seeing this video of yours: http://www.youtube.com/watch?v=7dmKEOWOhQA
...I asked myself why did you not do a comparision between your last test in that video and a direct driving of the HV coil, with the same energy input (The signal - voltage and on time, should be as close as possible to the kind of kickback spike that you get from the low voltage coil).

OK, i realize that it would not be easy to get that kind of signal, and measurements would be difficult also, but if done right, we could see if the low voltage coil is giving us any benefit, or is it just acting as a loosy low voltage to high voltage converter.

I just thought to mention this, hopefully it brings a new view to the thread.

Wish you luck and thanks for doing all the experimentation and video sharing.

[verpies]

could you please explain precisely what happens when the magnetic field collapse, I mean how is the process of the creation of the strong negative voltage in the wires. Perhaps some videos ?

Does this animation help ?
Notice that the wheel keeps turning for a short time AFTER the valve is closed.

Coils just do not like to have their current interrupted suddenly and they try to fight any current interruption by increasing the voltage in such manner that the current keeps flowing through the coil in the same direction and with the same magnitude...even if it means ionizing the air to keeping the current flowing through it.
This is the same behavior as that of a constant current power supply.

I also ask it because today i have replaced the reed by a hall sensor and a transistor so i can get a much shorter "on time " for the main coil, in order to stay as near as the 0.58 TAU. And it seems that by drawing far less current , the flyback spike stays almost at the same amplitude...

Remember that the 0.58 Tau is the "break even point" - not the "sweet spot".

[tinman]

Only 1 thing to say
!! FAIL !!

https://www.youtube.com/watch?v=ALg_9FR6egY

[gotoluc]

Hello everyone, Hello Gotoluc!

I've been reading this thread from day 1, and after seeing this video of yours: http://www.youtube.com/watch?v=7dmKEOWOhQA
...I asked myself why did you not do a comparision between your last test in that video and a direct driving of the HV coil, with the same energy input (The signal - voltage and on time, should be as close as possible to the kind of kickback spike that you get from the low voltage coil).

OK, i realize that it would not be easy to get that kind of signal, and measurements would be difficult also, but if done right, we could see if the low voltage coil is giving us any benefit, or is it just acting as a loosy low voltage to high voltage converter.

I just thought to mention this, hopefully it brings a new view to the thread.

Wish you luck and thanks for doing all the experimentation and video sharing.

Hi madddann, thanks for your interest.

There are reasons for doing things a certain way and not enough time to go over it all in the videos.

The MOT's low voltage coil has 0.8 Ohm of resistance compared to the high voltage coil has over 100 Ohms.
If I was to connect the same input to the HV coil and expect the rotor to turn at the same speed it wouldn't, unless I raised the input voltage quite considerably to get anywhere close to the speed I had. The other problem the high resistance causes is, it would needs much more time for the magnetic field to build compared to the LV coil since .  Also, the flyback from a HV coil would not have much energy and again because of high resistance.
So by far a low resistance (low impedance) coil is best for what I want to do.

I'm not sure if this answers your question?

Luc