Thane Heins Perepiteia.

[RunningBare]

gotoluc, please provide us the youtube Link to your video.
Thanks in advance...

@dani1 I have not yet uploaded the video's to my youtube account since it takes lots of time and bandwith to upload and I was waiting to see it there is a large enough interest to do so. Also my video is not showing anything diffrent than what you can see in Thane's video's. The only thing is it was done in the presence of 3 members of this forum and with my own video camera.

I will do it if Stefan requests for my video's to be posted or if 2 more members ask for it.

Thank you for your interest

Luc

Yes please.

[LarryC]

The Bi-Toroid Transformer design appears to be pure simple genius.

The following is an excerpt from a University Physics book describing how a transformer works: 'The process by which the transformer is enabled to draw the requisite amount of power is as follows. When the secondary circuit is open, the core flux is produced by the primary current only. But when the secondary circuit is closed, both primary and secondary currents set up a flux in the core. The secondary current, by Lenz's law, tends to weaken the core flux and therefore to decrease the back-emf in the primary. But the back-emf in the primary must equal the primary terminal voltage, which is assumed to be fixed. The primary current therefore increases until the core flux is restored to its original no-load magnitude.'

Since it appears that the design will decouple the primary and secondary flux, there should be no increase in current in the primary. The only small losses will be from wire resistance, hysteresis, and eddy currents. The normal for a no load transformer.

His design does not break Lenz's law, he seems to have found a way around it. His unorthodox design of his original generator, using an iron wheel instead of a non-ferrous type like the other 1000's of attempt on OU sites was very serendipitous. At first glance it appears that most of the permanent magnet flux would have been wrapping into the edge of the wheel. His results caused him to look into why the motor speeded up, which resulted in how he found out about the decoupling benefits. What great luck for the world.

By the way, most ceiling fan motors have a large toroid of laminated steel.

Regards, LarryC

[Steven Dufresne]

I did some homework today looking for high permeability cores. Thane's design talks about using a relative permeability (ur) of 100,000. The highest I could find for a reasonably easy to work with core was 10,000 for 6cm and 7cm cores. Anything at 20,000 was far too small to work with, a few millimeters.
These were on:
http://www.ferroxcube.com/prod/assets/fertor.htm
for example:
http://www.ferroxcube.com/prod/assets/tx633825large.pdf

I guess the higher the better and 10,000 is pretty high relative to a rod with ur=200. Does anyone know if there is better, while still being a workable size, on the market?
-Steve
http://rimstar.org

[LarryC]

I did some homework today looking for high permeability cores. Thane's design talks about using a relative permeability (ur) of 100,000. The highest I could find for a reasonably easy to work with core was 10,000 for 6cm and 7cm cores. Anything at 20,000 was far too small to work with, a few millimeters.
These were on:
http://www.ferroxcube.com/prod/assets/fertor.htm
for example:
http://www.ferroxcube.com/prod/assets/tx633825large.pdf

I guess the higher the better and 10,000 is pretty high relative to a rod with ur=200. Does anyone know if there is better, while still being a workable size, on the market?
-Steve



http://rimstar.org

@Steve,

Please check out http://info.ee.surrey.ac.uk/Workshop/advice/coils/mu/#mur for relative permeability of materials.
The ceiling fan motor toroid should be grain oriented silicon steel, almost any ferrite should be of less permeability.

Regards, LarryC

[Steven Dufresne]

Please check out http://info.ee.surrey.ac.uk/Workshop/advice/coils/mu/#mur for relative permeability of materials.
The ceiling fan motor toroid should be grain oriented silicon steel, almost any ferrite should be of less permeability.

Larry,
Thanks! Do the ceiling fans have high permeability cores to keep the amount of copper down, and hence the weight down? I just bought a dirt cheap, $15.00 ceiling fan on sale but was looking for any insight about if there's a certain type of ceiling fan that wouldn't have it before I rip it apart. It's returnable but probably not after I've broken any pieces.
-Steve