A question about magnets

[Low-Q]

I don't know where to post this, but the closest I got was under "MAGNET motors":

When a magnet is made, it requires energy to magnetize it - magnetic energy.
So, why is it so hard to extract this energy out of the magnet again?

A normal permanent magnet based electric motor, when loded maximum, the magnets must some how reduce their magnetic field - I guess it do, but I wonder why it seems that one can load this motor with several times more energy than what is used to magnitize the permanent magnets in it. The magnets must provide som counterforce to the electromagnet in the rotor! And this force seems to last forever!

Is it then a way to extract energy from permanent magnets alone? I mean, a magnetic field, which seams to be polarized, must be the voltages answer to electric polarity. In a capacitor, its possible to store a sertain amount of voltage and extract it by load it with a resistor. While loading the capacitor, a current with a magnetic field with a polarity is made.
So the idea is to extract the magnetic polarity in a magnet to provide voltage and electric polarity, which again can produce energy - without using wires/coils etc.

Isn't this what we all is discussing in the "Magnet Motor" topic - and still have no working models. I think we have to think different when handeling magnetic fields, and think the same way as we do when handeling electric fields and how to extract energy out of that.

Any comments or ideas folks?

Br.

Vidar

[Flit]

When a magnet is made, it requires energy to magnetize it - magnetic energy.
So, why is it so hard to extract this energy out of the magnet again?

It does take energy to create a magnet, but this energy is used to alter the structure of a piece of metal to turn it into a magnet.  The energy is used to make the magnet, not stored within it.

Think of hammering a nail into a piece of wood.  It takes energy to do so, but you couldn't get that energy back out of the nail at a later time.

[Paul-R]

Does thinking in terms of the concept of "potential energy"
lead anywhere?
Paul.

[Nali2001]

In the factory it only takes a short strong coil-cap pulse to permanently magnetize a neo magnet (or 100's at a time). That magnet will run a lifetime in generator allowing the 'production' of electricity. But won't really run down itself. And even if it does. Just a strong magnetic pulse form a big coil and cap will magnetized it for the next like 500 years. You only setup the material so the field can exist. The magnet's own structure (due to the pulse) will do the magnet field 'creating'.

[Low-Q]

When a magnet is made, it requires energy to magnetize it - magnetic energy.
So, why is it so hard to extract this energy out of the magnet again?

It does take energy to create a magnet, but this energy is used to alter the structure of a piece of metal to turn it into a magnet.  The energy is used to make the magnet, not stored within it.

Think of hammering a nail into a piece of wood.  It takes energy to do so, but you couldn't get that energy back out of the nail at a later time.

Thanks for reply.

I have thought about this too. But does it require much energy to move electrons from one surface to another, like you do when charging a capacitor? A capacitor is possible to discharge, so the question about using magnets as an alternative or potential energy source also came up.

Br.

Vidar