Quote from: TinselKoala on August 20, 2015, 06:48:09 AM
Those sure don't look like "variable inductors" to me. Unless you want to try varying their inductance by using an external magnetic field or something.

Here's one simple type of _actual_ Variable Inductor, called a "loopstick". The ferrite core is able to be adjusted in and out of the center of the Litz wire windings.

@Tinselkoala,

Gotoluc experimented with that coil in his "allcanadion no bemf" video. The coil has an "H" bridge and indeed comes with a magnet attached.

Two of your Variable Litz inductors facing one another in parallel should be able to power a bi-polar magnet spinner in between by sine wave. A butterfly capacitor, tuned to a fequuency low enough to start the magnet with a finger flick should be able to power it with LC resonant sine waves from a sufficient D.C source with no electronic componants.

To sustain the oscillation:

"Make the L of the LC resonator the secondary winding of a transformer and couple energy into the LC resonator by driving the primary winding of the transformer at the resonant frequency. If the Q factor of the LC is large, only a small driving signal will be needed". 

Pulsing a primary at the resonant frequency will sustain the oscillation more efficiently then adding power to the capacitor. The saturatable core wraped with a D.C. "Mag Amp" coil, can act as the "Transformer Primary" and sustain the oscillation with minimum input, if pulsed at the resonant frequency rather then topping the capacitor off from the losses. We can upgrade the circuit to supply a variable frequency range. The primary coil can both raise and lower the saturation level of the core with D.C  and efficiently pulse at the resonant frequency simultaneously to sustain the oscillation and save power.


@Tinselkoala,

What is inductance range in Henries of your variable Litz Coil?

@Tinselkoala,

You could seperate the Litz wire coils and designate one the Primary and the other the Secondary. The Secondary would serve as the Inductor in the LC tank, while the Primary's pulsed with low power D.C. at LC resonant frequency to help sustain the oscillation. The A.C. sine wave from the resonant oscillation powers the spinner, not the D.C. pulse.

The Seconday coil should easily tailor with the correct capacitor to deliver any Hertz and R.P.M desirable using the LC calculator. Gotoluc powers a large magnet rotor with a measly 28 milliamps. The Tank Oscillation should be able to transform at least that much current into fluctuating field strength from a battery.

Tinselkoala has apparently chosen to ignore me. He once again has proven himself completely worthless for any kind of constructive dialogue. I plan to ignore him completely from this point forward.