Electromagnetic Induction in Solenoid Generator Coils

[darkwizard]

I don`t now why it works, must be hysteresis of the core, the core retains the magnetization and at the on pulse (on the mosfet) the magnetization of the core is released into the coils , producing currents and repelling the magnet.

[Sephiroth]

I don`t now why it works, must be hysteresis of the core, the core retains the magnetization and at the on pulse (on the mosfet) the magnetization of the core is released into the coils , producing currents and repelling the magnet.

Are you positive it is firing directly on TDC? Do you have an oscilloscope?

If your circuit is based on the same principle as patmac's then the first graph I posted seems to be a reasonable explanation for the lack of drag.

[darkwizard]

I think that the energy remains stored in the core. This is called Hysteresis, is like a magnetic memory or magnetic momentum, when the magnet hits the coil the core remains magnetically charged until it reverses his polarity.

Good work sephiroth.

With an air core coil the phase of the voltage is the same that of the magnetic change, or in other words the change is instantaneous, there is no delay. A high hysteresis core will remain charged, if no current is used in a open loop circuit. The switching of the generator coils must be at TDC, the switching of the power coils must be at little away of TDC , just to give the rotor a direction.

The coil is charged like a cap.

[darkwizard]

http://ed-thelen.org/comp-hist/navy-...mory-desc.html


Is like a memory, that is the answer. The core remains magnetized, in a open loop / path.

[Sephiroth]

I can't say I have studied the waveforms of an air core coil but I am reasonably confident that the wave will be the same...

Look at the image I posted earlier and you will see why.



I'll see if I can do an experimetn to confirm it this evening.

[darkwizard]

Look this diagram is wrong, in a loop of wire the current and the voltage is one way when the north pole hits the coil.

This is offtopic, i don't want to explain classical electromagnetics.

[Sephiroth]

Are you saying current isn't induced when you wave a magnet over a straight length of wire?

Think about it.

[darkwizard]

I'm not saying that. What i am saying is simple. When the north leaves the current is opposite.

At the same time there aren't two currents opposite.

When you put a magnet inside the coil, the currents starts only if there is a closed path / loop. In an open path there isn't current.

[darkwizard]

But now look at a solenoid coil. There is a bunch of wires going in one direction on one side of the core, and the same bunch of wires going in the opposite direction on the other side of the core. In this case, when the magnet is at TDC, voltage is being induced in two polarities at the same time... therefore voltage is zero at TDC.

Wrong concepts.

[darkwizard]

voltage is being induced in two polarities at the same time... therefore voltage is zero at TDC. Wrong

[Sephiroth]

voltage is being induced in two polarities at the same time... therefore voltage is zero at TDC. Wrong

Fair enough... but bare in mind you said that I was wrong about the polarity reversing on TDC as well...

[darkwizard]

Yes, the voltage is reversing but the current is only one at the same time/moment, because the core discharges into the wires, the energy in the core is decreasing.

[darkwizard]

I wonder why i am discussing this ? take a book

[darkwizard]

Magnetic field is not voltage. When the magnetic field reverses the voltage reverses too, but this is not the case when the north pole magnet is inside the coil of an air core coil

[Sephiroth]

Ok... how about this for a test... if the voltage is proportional to the magnetic field strength in an air core coil (and not a ferrite core coil) then a Bedini SSG circuit can not work without a ferrite core.

What if I made an air core bedini motor and showed you exactly the same wave? Would you be convinced?