by Fred B. Epps
Created on 23 August 97
Date : 20/08/1997 11:56:59 From: firstname.lastname@example.org (Fred Epps) Hi Folks! In the spirit of others who have built or discussed overunity devices using large coils, here's mine. It is a parametric transformer that uses large coils to create a large change in L in ferrite or metglas cores which is tapped by a parametric output circuit for power. According to Stefan Hartmann's understanding of the Newman motor, this could be called a Newman transformer, understanding of course that Mr. Newman's explanation for his motor is totally different. In the attachment you will see three identical pairs of coils. (The number of pairs is arbitrary.) The primary circuit consists of parallel windings across all six coils in a resonant tank circuit driven by a low-power oscillator. These windings have many turns and are individually high inductance, although because of the parallel arrangement the L of the primary tank as a whole is relatively low. The secondary consists of much smaller windings in a series resonant circuit with the load. Every other secondary winding is in reverse direction so that the sum EMF generated by induction is zero. There is no back EMF because there is no forward EMF-- the energy transfer is entirely through the changing inductance.
The cores consist of manganese zinc ferrite or other magnetic material with a high variation of mu with applied field. The entire core assembly may be biased with an orthogonal permanent magnet field to put the cores at the knee of their B/H curve, to maximize change of L with changing primary field. How it works: it is conventional that a large coil generates a large magnetic field, thus the fields in the primary coils are large for a given current. Since the core materials are set up so that even a small variation in field causes a large variation in L, it takes a very small oscillating current in the primary to cause large changes in the inductance of the cores. The energy in a parametric circuit is strictly dependent on the variation of inductance in that circuit. This also is conventional, although not as widely known. Therefore the current in the resonant output circuit will be high. Small current in, large current out...it's as simple as that. Actually it's not as simple as that-- it never is :-) The large current flowing through the output circuit does load the primary to a certain extent by changing the inductance of the cores in opposition to the primary's effect. But this effect is minimized by the large difference between the size of the secondary and primary coils. And the primary current is so small that even if it were to double because of the loading it would still be small compared to the output. (Keep in mind that the usual voltage/winding equation in transformers does not apply here, since there is no induction). I will be interested in comments, especially critical ones. Fred