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Generator of electricity according to the scheme Gramma
(Frolov's F-machine)

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I call this F-machine scheme, since the stator and the field configuration resemble the letter F. After publishing my article in 1994, the Institute of New Energy, Newsletter, June 1994, p.9., I found analogies with the Gram generator (Zenob Teofil Gramm , 1826-1901, Belgium-France, patent for an electric generator with a ring rotor in 1869).

The essence of the idea is clear from figure 1. In the center there is a primary coil, and two secondary ones are wound diametrically on the ring core. An air gap between the annular and central magnetic core is important!

The principle of the F-generator. F-generator.

Picture 1

Two magnetic fluxes from the two load coils are mutually compensated and thus there is no reaction in the primary circuit.

In the Gram generator, an annular rotor with a toroidal winding rotates, which touches two diametrically arranged contact brushes. We get that all turns of one half of the rotor create a field that is directed in the ring towards the field created by the second half of the rotor.

A toroidal generator with an efficiency of more than 100% was constructed in accordance with Fig. 1.

Appearance of the ф-generator.

Figure 2

Today (12.06.2000), after 12 weeks of testing, inspections, etc. I did the first quick and trial test. (Gaps are not adjusted, and other things should be optimized).

    Checking 1:

  • The magnet coil is disconnected (no magnetic field)
  • Load disabled
  • The motor consumes 6V DC, 7.4A (RMS) power = ~ 44.4 Watt

    Checking 2:

  • The magnet coil is included (12V, 6A, 72Watt)
  • Load disabled
  • The motor consumes 6V DC, 11.4A (RMS) power = ~ 68.4 Watt

    Test 3:

  • The magnet coil is included (12V, 6A, 72Watt)
  • The load is connected (15V, 0.420A, 6.3Watt)
  • The motor consumes 6V DC, 10.5A (RMS) = ~ 63.0 Watt

When the load is on, I'm able to extract about 6Watt from the load coil, while the rotation speeds up the magnitudes by about 300rpm (from 3000 to 3300) and the energy driving the motor decreases about 5.5W. (Conventional generators behave a little differently - can we have the potential for further development here?) As I wrote the above, I need to optimize the rotor, because at the moment I have a 1mm air gap on both sides of the rotor. This air gap greatly reduces the efficiency (BH curve)

print version
Author: Frolov Alexander Vladimirovich
(St. Petersburg)
Date of publication 27.11.2003gg