How long two facing North pole of permanent magnets hold the magnetic force?

[freepenguin]

High speed rotating shaft creates heat and wear out the surfaces unless constant supply of lubrication such as engine oil.

I have this idea for creating frictionless motor between the rotor and stater.

The question is how long the magnetic force maintain the original strength when two North poles (or South poles) of permanent magnet face against each other.


Thanks

[mbrownn]

A looooong time, you would need a few more magnets to maintain stability but as friction consumes a huge proportion of energy in motors it would be useful to use this in high efficiency designs. I have seen experiments done but don't know where to look to find the info now.

By then attaching brushes to the rotor you would have a homopolar generator too. The info may have been a NASA patent.