Confirming the Delayed Lenz Effect

[Farmhand]

Gyula, What about if I get it running with just the core removed, then carefully slide the core into the coil to see the difference, both shorted and not shorted with and without the core. It would be easier than removing the entire coil. Maybe that's what you meant ?

Without the core the rotor is about 3/4 of an inch from the coil end, but there is the clip leads and the spade terminals on the coil former as well to think about, I think they have steel in them. Would the clip leads and spade terminals matter ?

Motor sounds sweet hey.

Cheers

P.S.  To all, I want to be fair and forthright. I have no intention of fudging anything and if I see something odd I will say. No bias.

..

[gyulasun]

Yes, if you can remove the core only, it is also good because I assume the air core coil with its tuning capacitor will not cause significant drag when the coil output is unloaded. The clip leads may cause also a negligible drag with their eddy current inductions in them.
The current meter does not change in the video when you short the coil output, it is good sign...

Gyula

[Magluvin]

Yes, if you can remove the core only, it is also good because I assume the air core coil with its tuning capacitor will not cause significant drag when the coil output is unloaded. The clip leads may cause also a negligible drag with their eddy current inductions in them.
The current meter does not change in the video when you short the coil output, it is good sign...

Gyula

Probably good to check all 3 ways. With coil and core, without core, without core and coil, just to have all stones unturned.   


Mags

[Farmhand]

OK done, And at three power levels.

At Power level (4) I got

No coil - 3017
Air coil - 3013
Shorted Air coil - 2986
Cored coil - 2854
Shorted Cored coil - 2967

At Power level (5) I got

No coil - 3106
Air coil - 3085
Shorted Air coil - 3063
Cored coil - 2928
Shorted Cored coil - 3062

At power level (6) I get

No coil - 3190
Air coil - 3176
Shorted Air coil - 3150
Cored coil - 2990
Shorted Cored coil - 3144

Fairly convincing experiment, I think it went well and is repeatable with similar results.
When I make the coil that will work alone with no added capacitance, I hazard a guess the result will be the same.

Oh and the power did increase this time when when the cored speed up happened at Power Level (6) only about 100 mA or so.
It didn't seem to move much on the other levels maybe because of the boost converter making a spongy voltage or something.
The higher levels of boost are 50% duty, the lower ones vary down to 20 % or so. Dunno bout that.

Cheers

[Magluvin]

Those are numbers that I would have expected where the core is the drag that speedup is overcoming. So many had failed to show that.

Your shorted numbers are good, cored or not compared to free running. Shorting is a bit different than just loading unless the load is heavy. Less of a load, more drag.

Thanks for showing that. 

Mags