Author Topic: Bemf test setup  (Read 7634 times)

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Re: Bemf test setup
« Reply #8 on: May 23, 2009, 17:24:04 pm »
Hi,

Accoording to the Radiant_1 aka Zeropoint, i added 2 Coils up to a strait dc powersupply.
As you can see on the video, the sparks are indead from Bemf pulses.
My setup is a controlled sparking circus, and so, there is not much of self oscillating cirquit.
But you can clearly see the sparks......
Next steps is to remove the relais with a self controlling spark.
Anybody suggestions?

As you can see, my workbench had a real hard time, the last view years... ;)
« Last Edit: May 23, 2009, 17:41:23 pm by Steve »

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Re: Bemf test setup
« Reply #9 on: May 23, 2009, 18:45:12 pm »
cool, do you want to draw a pic pls?
like to know how the mot's are conneced t the relay

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Re: Bemf test setup
« Reply #10 on: May 23, 2009, 21:20:26 pm »
I am downloading . ;D

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Re: Bemf test setup
« Reply #11 on: May 24, 2009, 02:02:24 am »
Hey Steve pretty cool
I have found however...that green arc is wasted BEMF energy. To collect it put a reversed diode across the terminals.
Like this
(http://i175.photobucket.com/albums/w152/Jdub6d9/spst_relay2.gif)

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Re: Bemf test setup
« Reply #12 on: May 24, 2009, 11:38:30 am »
Ok, good tip.
Let me try that on..

Steve

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Re: Bemf test setup
« Reply #13 on: May 24, 2009, 19:12:15 pm »
Hmmm,

Radiant, the diode, with or without capacitor didnt do anything....

Steve

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Re: Bemf test setup
« Reply #14 on: May 24, 2009, 20:51:41 pm »
The circuit you are looking for is this:
 http://www.geocities.com/mistertippy/schematics/CEMFC.html

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Re: Bemf test setup
« Reply #15 on: May 24, 2009, 21:14:00 pm »
i took the honneurs to place that picture here.
Thanks, Yaro.

br
Steve



When the button is pushed the inductor will generate a small amount of CEMF that will charge the capacitor (the CEMF generated is of opposite polarity to the source, so the diode allows only the CEMF to get to the capacitor). When the button is released the inductor generates more CEMF that charges up the capacitor further. After many cycles of pushing and releasing the button the capacitor will have a considerable amount of energy stored (up to 400V or more using an electrolytic, or 1kV or more using a non-electrolytic). To simplify the charging process a pulse generator can be used in place of the push button. And in order to get higher voltages faster, use an inductor with a high inductance (1H or more work good), and the time between changing states (from on to off) should be as short as possible. And for a powerful output use an electrolytic capacitor, or for a higher voltage output use a non-electrolytic.