Muller Dynamo

[Pirate88179]

Heat is no good.  I have soldered neos and destroyed them.  I am not sure what the Curie temp. is for them but, it is not all that hot.  Lower than my soldering iron with a few seconds of contact.

Bill

[khabe]

Curie Temperature and Max. Operating Temperature are bit different things 
for example: http://www.magnaworkstechnology.com/sintered_neodymium.shtml
Gruss,
khabe

[infringer]

too your comment about fairly high frequency too.

the magnets I have in the drive coils are suffering from induction coil heating. I pulled the magnet out today to test it with a bigger one and it was hot.
the problem is of course they demagnetize with heat.

Magnets in the drive coil?

I don't get it why do you have magnets in your drive coil? Are you talking about the ferrite rods in the center of the coil or the magnets on top of coils which should be separated by a washer and a plastic shim I could not see these getting to hot really when I think about it but I could be wrong and if they are might I suggest using a simple heat sync to disperse some of the excess heat. I am sure there is a way around any heat issues we may encounter with this device.

While I do recall romeroUK talking about heat issues of his own I think they could likely be overcame by energy free means if we exercise a little creative thinking....


By the way callhan or callnan errr I forget sorry ...

Is that a DC 12v fan that you are trying to use? Very cheap very small scale I love it its genius reminds me much of what Excommon would do when trying to attempt builds I am kinda shocked that he has not reared his head at all in this thread I was looking for a build idea like this for a cheap small scale testbed and I think you found it great job!

[yssuraxu_697]

the magnets I have in the drive coils are suffering from induction coil heating. I pulled the magnet out today to test it with a bigger one and it was hot. the problem is of course they demagnetize with heat.

Finally someone noticed

Actually demagetizing is not the biggest problem with that.
In my mind biggest problem is that the damn NEO IS MADE FROM HIGHLY CONDUCTIVE MATERIAL in mass.
Now think extreme eddy currents and what the efficency of the system would be if magnet was not conductive.

With i_ron's latest developments with ultra high output coils one way would be substituting neos
with non conducting ferrite magnets and eliminate those losses while still having reasonable output.

Here are people capable of calculations. Could you make a rough estimate how much
energy burns there? I guess a lot because it takes lots of energy to heat aircooled neo in such system,
especially if system is as efficent as toranarod's is.

[i_ron]

It's not to hard to DO SOMETHING...

http://www.youtube.com/watch?v=4Ginb8-RN0E

Excellent idea! great build, thanks for sharing

Ron