Confirming the Delayed Lenz Effect

[teslaalset]

I'm working with the idea of a coil with as low parasitic capacitance as possible and a separate capacitance bank that is switched in/out to have total 180 deg phase shift.

I have to disappoint you rogla, 180 degrees will not happen, max. current lag is near 90 degrees, no capacity applied.
Adding a capacitor will reduce the current lag to zero degrees max.

[rogla]

@teslaalset

Ok, that's true, 180 deg absolute phase shift will not happen, it was not that I tried to say. What I tried to say was switching between -90 deg and +90 deg by switching a capacitor bank with larger value of impedance compared to the coil at the operational speed and with correct timing. The relative change in phase shift should be near 180 deg (from -90 to +90), not the absolute value. I rather would like to express me in Swedish, sorry for that bad writing....

[rogla]

Adding a capacitor will reduce the current lag to zero degrees max.

For a solenoid like in the MIT lecture, I disagree strongly. The only time there is zero degree phase shift (except pure resistance) is a resonance, i.e when the absolute value of the impedance of the coil and capacitor i equal. This is very basic.

[mikestocks2006]

The question however is, how much of a phase angle is enough?
30 deg? 45? 60? 85? More?

If we use some already known numbers for e.g. the 8 magnet romeroUK setup:
RPM= 1300
L =1.2mH
R=2Ohms
The figures  are approximate and inductance under dynamic conditions may also fluctuate some.
Using the above and solving for phase angle
Tan(phi)=omega * L/R
phi is about 33
couple more on different rpm, rest are the same.
at
3000 rpm its about 56
and
4400 rpm it’s about 65

Again, what should be the minimum or prefered range?

Thanks for the posts folks.
Mike

[teslaalset]

For a solenoid like in the MIT lecture, I disagree strongly. The only time there is zero degree phase shift (except pure resistance) is a resonance, i.e when the absolute value of the impedance of the coil and capacitor i equal. This is very basic.

I am performing 3D Maxwell simulations right now to get the 3 stages you mentioned.
As soon as I have them finalized I will post them here, so we can discuss.