Simple Experiment: Extraction of Energy from Permanent Magnets

[dieter]

Edit, uhm I said "but this effect vanishes at square over distance", what I meant is: The effect of attraction to the PM vanishes, while the coil keeps on generating current until it's out of the field entirely.

[dieter]

Uh, what was I thinking, need coffee...of course it should be "in a motor with non-alternating PM polarity...".


So the timing /RPM could utilize the current that is flowing while the pulse circuit is passive.

[telecom]

Uh, what was I thinking, need coffee...of course it should be "in a motor with non-alternating PM polarity...".


So the timing /RPM could utilize the current that is flowing while the pulse circuit is passive.

I only refer to the mechanical action where the transfer of the momentum occurs.
By the simple Newton formula F * dt =m * v
Where F is the repelling force between the coil and the magnet, seems to be proportional
to the strength of the magnet, dt - time of the capacitor discharge
m - mass of the coil and v - its speed.
Try to direct the coil upward. then on the way back down  it can make work.

[dieter]

Yes but gravity doesn't alter the net gain, if there is any.


But you nailed it precisely by "proportional to the strength of the magnet".


Basicly, or eminently, the repelling forces add up. This force sum is present right after the coil is loaded, and therefor the force is transfered as a physical shockwave. The inductive reaction of the coil on the other hand is a transition from zero to max, where it is zero while the coil is closest to the magnet (so it has the highest effect) and at max when it reached a certain distance already.


So by means of logic, the secondary field will always be a weaker field than the primary one, and a huge magnet brings a relatively big diffrence between the two fields.


So I would definitely say, this diffrence is the gain that can be extracted as energy. So far experiments have shown no degradation in the amplification by PMs with increasing size. I have some Microwave Oven magnets and may try a stack of four against a tiny coil. Nobody cross that line of railgun fire tho ^^.


Actually, I think Art Porter was right about "magnetic amplification".


As a simple test device, a piston/crankshaft/flywheel type would make the whole Lenz drag department a lot easier, compared to a rotor type.

[telecom]

Yes but gravity doesn't alter the net gain, if there is any.
Of course, but it can perform work on the way down.
We had some discussion on the another forum re ballistic pendulum.
For example a bullet, if discharged vertically, will achieve a potential energy of
5000 J ( for the weight 10 g and a speed of 1000 m/sec).
At the same time, a ballistic pendulum will show its energy as only 30 J.
So, it looks like to avoid losses of the kinetic energy, it has to be transferred into
the potential energy first.
( That was the conclusion on my part from that discussion).