STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[Omega_0]

The setup

[Omega_0]

More measurements with two coils.
Surprise, no jump this time. The RPM increase almost linearly with current, upto a limit where it flattens and will not increase with current. Adding second coil doubles the RPM for same value of current. (80 to 180 at around 0.9 A)

I also varied the air gap (keeping the current constant). Here also there seems to be a jump for single coil case and perfectly linear relation in case of two coils.

Important thing to learn is that even one mm can make a difference, precision is needed to place the coil. I could not move the coil closer than 12 mm as the construction is not rigid enough.

[Omnibus]

@Omega_0,

Thanks for sharing these interesting results. Would it be possible to try running the motor with a pulse generator? What's the maximum current through the toroids?

[Omega_0]

Yes it would be possible. However it may not be practical.
Peak current values are in the excel file attached in above posts. (1 coil case)
I will complete the tests and upload the data in a day or two.

[Omnibus]

Of course, but for research purposes it would be preferable because you can make comparisons of the behavior of the toroids for same pulses with and without rotor. Would be interesting to see how that affects the input power. Just that, no pick up coil even necessary, may be an indication for unusual behavior if the presence of rotor has no effect. Other revealing studies, impossible when using reed switch or hall sensor circuit can also be done.