They are called 'free energy devices' because they seem to tap energy from the 'universal void'. This is the notion put forth by a number of theories about an immense background of energy beyond space-time. However, even with that notion, it is still a mystery why these devices work. The LOTA philosophy of science views energy differently from our conventional concepts of energy and would indeed provide a theory from which these 'free energy devices' can be explained. Most of it is not even present in space-time.
All energy is directed, by consciousness.
It is only through the means of an anchor that we gain access to localized energy. Such an anchor is created through the creation of a localized identity. Such identity is created through looping interaction patterns. In practice, this is achieved through a tight spin. Very tight spins form good anchors and are therefore high energy sources.