Giantkiller: Those documents are for another type of "MEG" device. I am not going to go deep into this issue, it's not my cup of tea. Plus there seems to be a TPU group and this is related and I don't want to get into it with them either. The fist thing I note is that the patent is from 1982 and the application note is from 2002. So is this real or just another idea that went nowhere? From the application note: Magnetic fields are represented as vectors. Adding orthogonal magnetic fields using permanent magnets will "increase the permeability mu " of the ferromagnetic core material. As a consequence, the inductance and the energy of the coil increases. The results are a higher COP value. I can't see how you can increase the permeability of the core material with the application of external magnetic fields. There is a diagram on page 16 that shows the BH curve and mu curve is shifted to the left because of the application of an external magnetic field. That's fine but they are claiming that the initial amount of magnetic flux B when H = 0 is a source of excess free energy. To me it looks like that flux is there because of the influence of the external magnetic field, presumably caused by an external magnet. To me that means when you start to put current through your coil to generate H, the permeability of the core is higher than it would normally be. Therefore the instantaneous inductance will be higher and for low values of H you can store more energy than you normally could at lower H values. This means that the instantaneous value of mu at lower H values increases, but the maximum value for B does not change. So the "overall" permeability for the core does not change. On top of that, since you are already biasing the core with an initial B, that means that you are occupying some of the "energy storage bandwidth" of the core. The result of this biasing of the core is that you can store less energy in the core when you put current through the coil to generate the H. What they call an "excess free energy component" associated with the initial B for H = 0 is really what causes the maximum energy storage reduction of the core. I think the most important point for me is that even if you shift the BH curve to the left and change the instantaneous inductance and make it higher, you still have to put energy into that core/inductance to get energy back out. Increasing your mu value does not mean that you get free energy, it only means that you can store more energy which you can get back later when you discharge the inductor. The COP of the energy storage/retrieval will not increase. Certainly you may be able to store more energy for a certain amount of current that you put through the coil, but that does not mean you get an increase in COP. The volume of a ferromagnetic core material gives you the capability to store a certain amount of magnetic energy. So the higher the power transfer capacity of a given transformer at a fixed excitation frequency, the larger the transformer has to be. You need to increase the volume of the ferromagnetic core to sustain a higher power transfer because you need to store an larger amount of energy in the core for each cycle. If you bias the core with an external magnet so that it always has a fixed base amount of flux B flowing through it, you reduce the amount of energy you can store in the core for each cycle. From what I can see, biasing the core with a base amount of flux B, or not biasing the core, will not change the energy in/out COP of the core. The only thing it will do is give you a higher instantaneous inductance for lower values of H, i.e.; the amount of current you are putting through your coil. MileHigh
