Thane Heins Perepiteia.

[Groundloop]

@M@rcel,

I decided not to destroy my MEG. So no more core/transformer testing for a while.

Groundloop.

[Heinstein]

@aether22,

What I have is an induction motor.

http://en.wikipedia.org/wiki/Induction_motor

I have seen all the videos.

Thane,

You can also use color in your answers. 

Groundloop.

THANKS MAN!

But it's too much work, LET ME BE CRAZY FOR NOW.
Cheers off to dinner now...
Thane

[PulsedPower]

Groundloop

The price of magnet wire in Norway is horrendous, I think it is around A$14 / kg for 1mm wire in 10Kg spools here in Australia.

I did a test where I connected a 450 turn coil (Ferrite core) to my DVM. When I placed the coil close to my motor axle (motor running) then I got 0,003 VAC open coil voltage. This flux is so small that it could well be from the internal motor coils. I do not have a magnetic flux meter so if anybody on this forum can do the test I will be grateful.

The coupling into a toroid of reasonably high permeability by an external field will be very low, far better to pass the shaft though a coil and hook the coil up to a CRO to determine the changing flux in the shaft, no need for hundreds of turns, 50 should be plenty..

[Heinstein]

Luc and I (or at least I) will be starting a more efficient primary on Saturday.
We may have some results posted early next week.

Thane

[aether22]

I think it is around A$14 / kg for 1mm wire in 10Kg spools here in Australia.

Not sure I can get it that cheap in NZ, but better look around a bit more, need some more wire though.


Thane, your results are very interesting but here's a test for you, compare the speed with and without the coil present (when present have it open circuit).

Or alternatly with 2 coils present, neither shorted but one monitored for voltage, them remove the other one and see if the voltage on the monitored coil changes. (If it's higher with one then that makes sense since there are core losses that have been reduced but if it's higher with 2 then something might be up)