Let's see if I can reverse-engineer your idea. It entails small magnets in a sliding configuration within heads mounted to the ends of arms on an unbalanced wheel. At one side of the machine, a pulse magnet would push those sliding magnets inward, where they would be stuck to a small piece of metal and thus not move against the centrifugal force attempting to fling them outward, and at the other side of the machine, a permanent magnet would pull those sliding magnets outward, where they would be held by centrifugal force.
The physical difference in distance from the center of the wheel of those sliding magnets on each side of the wheel would mean a weight imbalance, causing the wheel to turn, creating a "relay" effect whereby a small input triggers a larger output.
Is that the general idea? If so, here's a few ideas...
1) Put your pulse magnet and permanent magnet at the top and bottom of the wheel to maximize the force imbalance.
2) A joule thief / energy recovery circuit (operating at the resonant frequency equivalent to the wheel RPM times the number of arms), in order to recover that collapsing magnetic field of the pulse magnet and reuse it.
3) Use that centrifugal force! It's attempting to fling the magnets in the arm assemblies outward, so switch your pulse magnet to a "pull" configuration. It'll take less energy to pull them outward with centrifugal force helping than it would to push them inward against that centrifugal force. Let the PM do the work of pushing them back inward.
4) MuMetal shielding around the PM on its approaching side. This will constrict the magnetic field to a narrow band which has an effect only after
the arm assembly has approached, lessening the "push-away" effect between the PM and the approaching magnets in the arm assemblies.
5) A conical pulse coil to concentrate magnetic flux.
6) Flux "switching"... check out:https://www.kjmagnetics.com/blog.asp?p=magswitchhttps://www.youtube.com/watch?v=E6idrAEO6W0https://www.google.com/patents/US20120133466http://www.cheniere.org/misc/astroboots.htmhttps://www.youtube.com/watch?v=Z_UHixEy7xU
If you can rig up a permanent magnet which does most of the 'push/pull' work, and a much smaller coil which merely switches the magnetic flux between two routes (one route is the PM doing work against your wheel, the other route is a magnetic flux 'short circuit'), you could use a much smaller pulse magnet and get a much larger amount of work done on the wheel.