Permanent magnet motor

[lumen]

Reaching the coercive force does appear to be a problem. I originally demagnetized it so I would be able to see any indication of the new magnetization direction but there is no noticeable new field.

Usually a coil can be wound to provide the magnetizing field by a capacitor bank discharge, but to generate a field in such a way as to magnetize a cylinder with a field like a conductor makes it difficult to reach the coercive force.

The idea is to achieve a circular field like a segment of a conductor with a current flowing through it, in a cylinder magnet.
Just pumping a current through the magnet is either not generating a field inside the magnet, or is no where near the coercive force required to retain the field.

I thought a bit about winding a coil to achieve the correct field and I'm not sure it's possible. (toroidal maybe)

Still looking for some clues.

[MarkE]

Reaching the coercive force does appear to be a problem. I originally demagnetized it so I would be able to see any indication of the new magnetization direction but there is no noticeable new field.

Usually a coil can be wound to provide the magnetizing field by a capacitor bank discharge, but to generate a field in such a way as to magnetize a cylinder with a field like a conductor makes it difficult to reach the coercive force.

The idea is to achieve a circular field like a segment of a conductor with a current flowing through it, in a cylinder magnet.
Just pumping a current through the magnet is either not generating a field inside the magnet, or is no where near the coercive force required to retain the field.

I thought a bit about winding a coil to achieve the correct field and I'm not sure it's possible. (toroidal maybe)

Still looking for some clues.

If you want the field to look the same as if a current runs down the central axis, then running a magnetizing current through the central axis is what you need to do.  You might be able to make it work by placing the magnet inside a copper tube just barely larger than the magnet and then pulsing the tube length-wise.

[lumen]

If you want the field to look the same as if a current runs down the central axis, then running a magnetizing current through the central axis is what you need to do.  You might be able to make it work by placing the magnet inside a copper tube just barely larger than the magnet and then pulsing the tube length-wise.

I tried current directly through the magnet and the magnet inside a copper tube, but nothing.
I used a 51,000 MFD capacitor charged to 30V and direct discharge with less than 2" leads. Crack!
But still nothing.
I have two of those capacitors and they are rated 40V but I have no way to know how close that gets to the required coercive force to retain the field.
Probably will keep increasing the power until something changes unless there is a way to calculate the requirement.
It's bound to be very high because the field generated is not increased by winding additional loops like in a coil and in fact may be impossible to reach before the copper tube or magnet simply vaporizes.

[lumen]

It does appear that a magnet either cannot be magnetized to generate a circular field or the field simply is contained inside the magnet.

Logically, the field is simply retained within the core the same as connecting several magnets to form a ring or even placing a keeper on a magnet and retaining the field within the magnet.

Just pondering why a conductor is so different I might think that a field is generated in the conductor core which pushes the moving electrons outward to the skin of the wire where another field is generated outside the wire in the air.

One field inside pushing electrons outward, another field outside expanding into the air.
If this were true it would be impossible to generate the same field by permanent magnets.

[guest1289]

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