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Overunity Machines Forum



Simple to make Hilden-Brand style motor

Started by Nali2001, April 13, 2007, 03:40:34 PM

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scianto

#335
February 15, 2011, 02:41:25 PM
>> HOWEVER your scope shot showed the scope zero level was at the source point of the MOSFET, is that right?
*
That is right.


>> If yes then there is no way (in a normal circuit you show in the schematic) the spike should be limited to 36V.  Normally if everything is ok, the top peak of the spike should be at 72V,  (2 x 36V plus the 0.7V diode forward voltage) in your shown schematic. 
*
Well, I feel a need to explore it deeper because, any way, it looks to me as interesting phenomenon. I am going to explore it in detail but later.


>> Your 50 milliOhm coil resistance demands switches in the several hundred Amper range.
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Sure, but such FETs cost nicely, so I am trying to find solutions with transistors of "normal" prices :)


>> if you use 36V supply voltage, the FGA25N120ANDT has 'only' 50A collector current rating (90A when pulsed, pulse width depends on junction temperature).
*
That is true. One nice thing about this IGBT is that it can withstand 1,2 kV between the D and S. The G-S is well protected and I see no spikes there. This is the first transistor that let me run the bicycle wheel today :)
I am uploading a video of the first run test to yt. Now improving on the electronics in order to remove the high voltage spikes and avoid over charging the charged battery.

scianto

#337
February 17, 2011, 03:55:44 AM
I am using this circuit to drive parallel path magnet motors, also the one build in my bicycle:
http://www.overunity.com/index.php?topic=10387

Please, try it with your motor, tell me how it works.

i_ron

#339
March 27, 2011, 11:20:20 AM
Quote from: i_ron on February 13, 2011, 05:23:35 PM

I have a problem with your request though, lol, the little engine has been taken apart in preparation for the next build.


Ron

Hi all,

Here is that next machine! (finally) usual problems along the way..

But here is the first run...

http://www.youtube.com/watch?v=S2TcPgwP_rA

Changes to the H bridge ...now using the Si8220 chip

http://www.silabs.com/Support%20Documents/TechnicalDocs/Si8220-21.pdf

Which allows me to use far fewer components in the high side drive.

Ron
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