Current density v current supply and a generator size questions

A current supply gives, say, 100 Amps. That is without regard to where the current is flowing; it is what an Ammeter reads. Now, if you run that 100 Amps through a conductor that has a cross-sectional area of 50 mm², the current density would be 2 A/mm². (By the way, I don't know the standard metric units for current density. It might be 2,000,000 A/m²).

So, for example, if I run 10 amps through a conductor that has a cross-sectional area of 0.1mm2, the current density would be 100 A/mm2? I'm trying to find how I can achieve a density that's ten times the supply. For example, I want a supply of say 500 amps and a density of 5000amps, is that possible? According to what I've understood, if I wanted to achieve those numbers I would still need to use a wire of 0.1mm2 and that doesn't seem right somehow.

I may be completely wrong about this so anyone please feel free to correct me but I believe all conductive materials have a maximum possible current density achievable at a given temperature. If you attempt to exceed it by applying a greater motive force, the physical property of the material will be changed (e.g., melt or in some fashion disintegrate).

So, you may not be able to achieve the current density you desire for a particular conductor at the temperature you desire.

Current density quantities require cross-sectional areas. A 100 Amp supply can produce a current density of 63,662 Amps per circular mil, for example.

Current Supply means - the current which is drawn by the load. this will vary according to the cross sectional area of conductor which you select for your application.

Current Density - It means the amount of current flowing in a conductor normally for the Design consideration we can select with Current density of 3.5 ~ 4.0/mm².

For eg: the load draws 4A of current means we can preferably choose 1mm dia of the copper.

Current density is the current carried by the material= A/Sqmm

It depends on material properties

Currenty density of Copper= 160A/mm2

Currenty density of Aluminium=100A/mm2

Current supply means the current required to deliver the power of equipment

For a 400V 2MW DC generator has a size of approximately 700x225x225 inches.

Now DC generators of that much size is not available as it is replaced by AC Alternators

For DC generators, Watts= Voltsx Currentx0.001 kW

The voltage of DC generators depends on speed of rotation of armature. So you can vary the voltage with governor control mechanism. The current generated depends on the current required for the circuit connected to the DC generator and input of the turbine connected to the generator

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The current output capacity of a DC generator is dependent on the cross-sectional area of the armature windings, the winding insulation class and heat removal method employed (heat removal capacity). The ability to maintain the windings below the insulation failure temperature is critical.

The overall physical size of the generator will be determined by the configuration of these 3 design considerations. It can vary considerably and method of cooling the windings will likely have the greatest impact.

The range of cooling methods can range from ambient air cooling to forced circulation of liquid nitrogen through the windings. Budget is obviously the real limiting factor.