Here's a homemade variable inductor for A.C. current. Two of these variable coils in parallel, facing one another, would power the spinner with a sine wave coupled to a variable capacitor to control the resonant frequency!

Naturally, a battery and potentiometer would replace the A.C. signal generator after the variable capacitor was connected.

Any two solinoid coils with sliding steel cores connected in parallel and wired to a butterfly capacitor should be able to run a diametric spinner between them with the LC resonant sine wave. Pushing the steel cores in and closing the capacitor plates would lower the frequency and R.P.M..

Increasing power input to the capacitor, would increase the amplitude of the LC sine wave, strengthen the magnetic field of the coils and add power to the spinner, but the LC tank resonant frequency would still control the R.P.M.

3000 R.P.M. with a finger flick? Scaling harmonics!

The contradiction of this sine wave motor is that speeding it up would force the operator to turn the power down!

Quote from: synchro1 on August 20, 2015, 05:00:01 AM
Any two solinoid coils with sliding steel cores connected in parallel and wired to a butterfly capacitor should be able to run a diametric spinner between them with the LC resonant sine wave. Pushing the steel cores in and closing the capacitor plates would lower the frequency and R.P.M..

Increasing power input, would increase the amplitude of the LC sine wave, strengthen the magnetic field of the coils and add power to the spinner, but the resonant frequency would still control the R.P.M.

3000 R.P.M. with a finger flick? Scaling harmonics!

The contradiction of this sine wave motor is that speeding it up would force the operator to turn the power down!

Why do you think that is a contradiction (sic) paradox?

"Another method to control the inductance without any moving parts requires an additional DC current bias winding which controls the permeability of an easily saturable core material".

So we can regulate the parallel coil inductance by wraping the core materials with seperate D.C. windings. This "Magnet Amplifier" circuit would permit us to finely tune the D.C. power exactly to each coil to achieve LC resonance with a seperate potentiometer and battery source.

Three knob controls. This motor will only run in resonance, but be very close to 100% efficient.

Quote from: synchro1 on August 20, 2015, 04:08:16 AM
Here's a picture of four variable Inductors. Two variable Inductors in parallel can power the spinner from the LLC sine wave from a variable capacitor matching impedence. We should be able to control the frequency and R.P.M. by increasing or decreasing the Inductance and Capacitance, thereby altering the resonant frequency.

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.