Extracting work from permanent magnets is not hard to do. Making that work energy do something practical is whats the real issue.
Definition of work, energy, power and how each is qualified and quantified often comes down to semantics.
A simple example is two magnetic plates consisting of a number of individual magnets in like pole orientation are placed with the sum of the opposing poles of each plate facing each other.
The top plate will levitate above the other and can support a load greater than itself with out the two plates ever contacting each other and can do this for great periods of time.
Gravity is being resisted against and work is being done. The weight can be measured and the time can be measured and an equivalent electromagnetic system can be fashioned as well which can be used to accurately measure the energy being exerted to produce the same effects.
So do you consider the levitation effect and resisting gravity an exertion of energy or not?
Make some of the individual magnets so they can pivot and a few rotate and add some iron sheets in specific areas around specific magnets so as to be able to bend and redirect the magnetic lines of force in reference to a cam or some form of mechanical system that times the redirecting of the individual magnetic fields by the iron sheets and the levitating plate will then slowly and continuously rotate over the bottom plate while still supporting its own weight plus the weight of what ever was placed on it.
Energy is being exerted and work is being done.
And yes after some time the magnets loose their strength and the system stops moving and levitating. Depending on how strong and what type of magnet is used that time can however be incredibly long!
A one watt output that runs for 100k hours is still a good deal of energy. And consider that to recharge the magnets it takes far less than 100 KWH of power to do it!
SO is it over unity? I dont think so. Rather its just tapping into the subatomic energy of the magnetic materials atoms. The same energy that keeps every electron of every atom of the known universe spinning indefinitely!
(Or purely semantics of definition of work.)
