Tesla's dynamo of novel principles

[horianica]

Hi,
In 1918, in one of its lectures, more specifically “A lighting machine on novel principles”, Tesla discusses about a machine that uses two of his best inventions. One is his bladeless turbine and the other one is a dynamo of novel principles.
He mentions about that dynamo that “it consists of a smooth cylindrical body mounted on the turbine shaft and arranged to rotate into a magnetic field of novel form. There is no brush or sliding contact whatever, the current being taken from stationary terminals to which the ends of the generating coils are connected. (…) The guiding idea in the development of this new machine was to evolve a mechanism approximating a static transformer of energy in simplicity, efficiency and reliability of operation.”
For more information on that lecture you can check the page 190 of the John Ratzlaff’s compilation: “Tesla Said”.

At first I was inclined to believe that Tesla referred in its lecture to its Unipolar Dynamo patent (No. 406968) but after reviewing that patent I’m not so sure anymore.

Does anyone have an idea to which dynamo (patent number) is Tesla referring to?
Thanks.

Horia Nica

[barbosi]

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[barbosi]

Very interesting observations. I would say the same as you about patent 406968 and there is also this: Tesla’s Unipolar Dynamo working principles | Free Energy which I'm sure you studied too.

But it's been a while since something puzzles me and you could read it too at: Induction Generator. Isn't it the induction motor one of Tesla's dearest achievements? There are no slip rings and the squirrel cage is one of the simplest and cheapest motors. Dynamo you said? Patent 413353 figure 5 shows how it can be delivered DC from am induction motor, doesn't it? Well, it doesn't have "smooth cylindrical body" and is not "arranged to rotate into a magnetic field". These are the reasons I would point to an unipolar dynamo. Nevertheless, I find rather fascinating how it seems in Tesla's mind, all his machines are different embodiments of the same principle.

I don't know, I'm mulling things over. As I said you got an interesting observation.

[horianica]

What caught my attention in that lecture is the fact that Tesla mentioned that the combination of its bladeless turbine with that dynamo “takes not more than one-third of the steam consumed in other turbo-generators of that size”.
Knowing that Tesla was very precise in its calculations, I assume that those figures are fairly accurate.
That means that its new system would have been 3 times more efficient than the available systems of its time. It is a known fact that its bladeless turbine was more efficient that the available steam turbines, but with no more that 10%.
In that case it means that the dynamo that he refers to would have been at least 2.7times more efficient that other generators available at that time. Knowing that in fact all the other generators were its own inventions it is not surprising that, according to that lecture, he considers that dynamo of novel principles as its greatest achievement in that area.
Currently the most efficient generators based on Tesla principles can achieve efficiencies higher than 90%. I would assume that in 1918 the regular generators would have lower than 90% efficiencies; I would assume something around 50% efficiency.
In that case, that dynamo of novel principles would have an efficiency of 135% !!!
Again, does anybody have an idea to what dynamo/generator was Tesla referring to?