Muller Dynamo

[tombrid2000]

Aviso seems to explain the principle quite well here

http://www.youtube.com/watch?v=uEtxb6skBCE#t=15m15s

from about the 30minute mark.. though all of it is interesting
apart from the bird... we use one hall to trigger the rotor drive
and one to short the coil at precise moment

[hartiberlin]

The  ambulance was at Tommy's place and have set him on moderated...

[scratchrobot]

Sad news I blew up my dynamo
Most of the coils are gone but I am happy nothing hit me. I don't have time to rebuild right now but maybe later.

I wish I had it on camera, lots of energy

scratchrobot

[chrisC]

Sad news I blew up my dynamo
Most of the coils are gone but I am happy nothing hit me. I don't have time to rebuild right now but maybe later.

I wish I had it on camera, lots of energy

scratchrobot

Wow! Please be careful. This stuff is no toy and at the few hundred to a few thousand RPM with the mass, the magnets can seriously injure. When my setup is ready, I will make sure to power it low enough to allow the disc to spin and making sure everything is tied down good, especially the rotor!
Good to know you're OK.

ps: oh, here's my current setup with the rotor freely spinning (manual) on smooth VCR bearings with magnets on it! Another 1 or 2 weeks I will hopefully update more.

cheers
chrisC

[resonanceman]

Sad news I blew up my dynamo
Most of the coils are gone but I am happy nothing hit me. I don't have time to rebuild right now but maybe later.

I wish I had it on camera, lots of energy

scratchrobot

scratchrobot

Did it get going fast enough to yank the magnets out?

I was thinking of  looking for some Kevlar thread to bond to the  outer edge of the rotor......just one layer of Kevlar would allow MUCH higher speed
Carbon fiber could do the job too.......but sense it is conductive it would have lots of eddy currents.

gary