So far, there are just a few ideas based on Faraday's disk experiments.
They could be called Homopolar machines, I suppose. They hopefully demonstrate the creation of back torque. One day, I'll get around to trying a few of these ideas out. Until then, I can only wonder if they will work.
Some thought experiments about moving conductors and magnetic fields can be found here:
Difference between linear and rotating systems
Interesting discussion in Google groups about some concepts illustrated here
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