Tesla was right! Bifilar coils are better for generating electricity: Part 18

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Nicola Tesla said in 1894 that bifilar coils could reduce a certain self-inductance which arises in copper wire coils, when they generate electricity. This self-inductance (or magnetic self-repulsion) makes the generating process inefficient, especially at high voltages and high r.p.m. (see the patent US512340A or https://teslauniverse.com/nikola-tesla/patents/us-patent-512340-coil-electro-magnets or https://patents.google.com/patent/US512340A/en).


In order to test his conclusions again now in 2020, we made a series of suitable wire coils with 800 turns of 0.50 mm PEI-coated copper wire (and many other coils not shown in this video). They were wrapped by hand as “monofilar”, “bifilar”, “quadrifilar untwisted” or “quadrifilar twisted” (into a helical shape), and also “monofilar with an iron centre”. We tested these various wire wrappings both around central formers made of wood or iron, and also as pancake coils with wire running fully into their centres.

Our results confirm that any wire coils with significant capacitance (the easiest to make of which is “bifilar”) give 50% higher output currents at 500 r.p.m. in a standard test system (using 12 N-S-N-S neodymium magnets spinning above a single coil on a rotor), than for standard monofilar coils which have hardly any capacitance. We placed all of our test coils over 3-mm-thick, mild-steel discs to help extend the rotor magnetic field across their heights, while we did not place iron inside of any of our coils, except in one control example, because it impairs free spin of the permanent-magnet rotor due to para-magnetism.

Many thanks to K.B. and A.M. for their skilled help!
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