Faraday's disk experiments of 1831 have significance for a variety of reasons. From rail guns to Tokomaks to the origin of the earth's magnetic field, the Faraday generator has played a key role in present day science. Also called a homopolar, unipolar, or acyclic generator, it is the only one to produce electricity without commutation. Faraday's one-piece style of co-rotating the cylindrical magnet with the conducting disk is considered to be an unusual configuration and has eluded complete scientific explanation. To this day, prominent scientists can be found who believe it will not work since they operate with the flux line conceptualization. However, its importance is found in the connection to the earth's magnetic field, which evolves from a one-piece Faraday generator. A laboratory model is used to investigate the presence of back torque or armature reaction with the generation of electricity. For the first time, 1) the back torque of a one-piece homopolar generator has been measured, 2) the classification of the homopolar generator ary In space, whether or not the magnet rotates with the disk, creates the electromotive force (emf) measured from center to outer edge of the Faraday disk. A detailed discussion of the field rotation paradox may be found in my book, The One-Piece Faraday Generator, Theory and Experiment [2]. The simplest explanation for the operation of the HPG or the OPFG is the application of the Lorentz force on arbitrary radial segments as they pass through the magnetic field, thus explaining the force on the conduction layer electrons. Further molecular lattice effects of the motoring effect of back torque can be understood in terms of the Hall effect and the force on positive ions [10].

As the current is generated by the emf, a negative spiraling effect is seen as the disk rotation leads the radial current around the disk on its way across it. A further experiment is possible with a radially-seg-mented disk, to eliminate these eddy losses which tend to demagnetize the field. An alternative which Tesla proposed, is a spirally-segmented disk, which becomes a self-exciting Faraday generator (SEFG) [8], countering demagnetizing effects. Tesla's suggestion eliminates the problem of the standard current flow creating a partial eddy current of its own. A wise note of Tesla's is to optimize the design of the spiral with the operating speed, thus preventing any negative effect from excessive speed. Integrity Institute has plans to use computer modeling for a spirally-segmented OPFG.


Self-Sustaining Vs. Self-Exciting

One of the major reasons for interest in the OPFG is that the earth itself functions internally as a large OPFG. Moreover, the earth's OPFG

Proc. Intersoc. Energy Conver. Eng. Confer., 1991

as a regulated voltage source has been experimentally determined, and 3) an effect, involving the lack of measurable voltage in the rotating frame, has been verified with a specially designed LED voltmeter. A back torque value of 0.17 N-m for a 25 Watt generator was obtained, in agreement with theory.

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