The Master Of Magnetics "Steven Mark"

[argona369]

.

[jacob]

Hello all,

Just thought this could be useful. To help everyone understand how you get a rotating magnetic field with 2 sinewaves, I have attached 2 drawings, one for each TPU architecture. This illustrates what happen when we have 2 similar frequencies that are 90 degrees out of phase. These drawings are not as nice as Tao's cad rendering of the TPU windings, but they should do the job.

The aligned winding architecture is easier to understand than the torroidal architecture, but corresponding phases of each architecture represent a similar field orientation. And they both  produce a magnetic field similar to the one shown on the animated gif below. A similar rotation will be obtained even with dissimilar frequencies or varying phases.


Regards,

Jacob

[hartiberlin]

So,

I had the thought to try two coils at once in varying positions to each other and the earths field.

The interesting thing is that the coils both get the same signals as the first experiments, BUT when the two coils are placed a certain distance from each other, both of their signals jump from 10mV PP signal to 40mV PP each.

Perhaps the signals provided for free in each coil are able to "bounce" of each other and self amplify?

Obviously this is very small voltages which are of no practical use, but it shows that certain coil orientations can self amplify a signal with no input from the operator, just "natural signals".  So this maybe clue, or it may be rubbish!

Note that this works in any orientation with repsect to the earths field and only when the coils are in the right phase.  Turn one coil the other way around and the signal drops, so probably just mutual self inductance...


Regards,

Dave.

Hi Dave,
why did you do this test on a steel table or chair ?
It works like a faraday cage and will make all your signals
worse.

Please try again in the open space with no iron or steel
or any metal near.
Many thanks.

Regards, Stefan.

[jacob]

A rotating magnetic field can be constructed using two orthogonal coils with 90 degrees phase difference in their AC currents. However, in practice such a system would be supplied through a three-wire arrangement with unequal currents. This inequality would cause serious problems in standardization of the conductor size and so, in order to overcome it, three-phase systems are used where the three currents are equal in magnitude and have 120 degrees phase difference. Three similar coils having mutual geometrical angles of 120 degrees will create the rotating magnetic field in this case. The ability of the three-phase system to create a rotating field, utilized in electric motors, is one of the main reasons why three-phase systems dominate the world's electrical power supply systems.

Thanks for bringing this up Marco, its very accurate. But we don't want to supply the grid with industrial grade electricity able to power 3 phases ac motors, we're just rotating a magnetic field exactly like a deflexion yoke would do. And we're doing it with 4 wires, not 3. So this is no feat at all. Now don't forget: a deflexion yoke is magnetically identical to a TPU.   

Marco, remember we were told to avoid mainstream ideas. We have to stay open minded if we want to achieve our objective: we want to build this thing! 

Regards,

Jacob 

[jacob]

Actually, for the phases in both architecture to represent equivalent magnetic fields , the toroidal phases should look like below: