Understanding that questions similar have been asked, I wanted to propose a different one.
Imagine you make a circle of 'permanent' magnets where each magnet has the N direction pointing inward at an angle of say 30 degrees from aligned with the center of the circle. The number of these magnets I believe would be relatively irrelevant once you get like 10 or so magnets in a circle. Now imagine there is a pinwheel of permanent magnets floating on some oil or liquid. The magnets in the pinwheel have their N facing out towards the edge of the circle. This should generate a force to spin the pinwheel as I understand due to repulsion of the two magnet ends. Assuming there is a speed such that this device can keep spinning, how would such a mechanism eventually be forced to come to a stop?