Replies to post #69737 on Tesla Inc (TSLA)

[boston745]

You're talking insulator not shield. Titanium is not a good insulator because being paramagnetic means it can align to the magnetic field and thus behave magnetically when exposed to a magnetic field. Once the field is removed, titanium returns back to its original nonmagnitized state.

[boston745]

The gif example is explained in your last link in the following paragraph:

Skin Effect and Surface Currents

Magnetic fields cause eddy currents to flow in all conductor surfaces they impinge upon. With a sufficient depth of conductor, these eddy currents generate enough of their own magnetic field, that opposes the impinging field, partly reflecting it away from the conductor. The finite conductivity (non-zero resistivity) of the conductor causes these eddy currents to lose some energy as heat, governing the rate of absorption of the magnetic field as it penetrates the conductor.

How much depth into the conductor is required for good-enough magnetic field shielding depends on the skin depth in that type of conductor. For each skin depth further below the surface of the conductor, the eddy current density diminishes by 1/e, where e is “Eulers number,” approximately

Thanks for this because this better explains how the Cybertrucks exoskeleton absorbs the EM induced eddy currents. Its better to be absorbed in the exoskeleton than the ICs within the vehicle.
I'm still reading the article but it touches on thickness of the shielding material. The thicker it is the more the exoskeleton can absorb. Cybertrucks exoskeleton is 3mm thick and Starship is supposed to be 6mm thick. Obviously the radiation levels in upper atmosphere and space are significantly greater than on the surface.

[boston745]

If we were trying to shield the magnetic fields from a 60 Hz transformer, a 3 mm thickness of copper or aluminium could only achieve about -3 dB, but 3 mm of this grade of mild steel could achieve about -18 dB. (There is more to the effective shielding of power-frequency magnetic fields than this, such as the avoidance of magnetic saturation, but this is outside the scope of this article.)

Look at how much better steel is able to attenuate than copper & aluminum at 3mm thickness the cybertruck exoskeleton will be.

All conductors always shield electric, magnetic and EM waves/fields, even if they are used as power, signal or data cables or PCB traces, PCB ground or power planes, or non-electrical brackets, support structures, fixings, etc., etc.

In just the same way, all conductors (wires, cables, PCB traces, brackets, PCB planes, conductive liquids, etc.) still behave as inductors, mismatched transmission lines, and “accidental antennas,” even if we call them “ground” and cover them with green insulation (even if it is green with a yellow stripe!).

All conductors absorb EM energy like cybertrucks exoskeleton. Likely why Teslas have such EMI issues. All those wires and pcbs absorb that EM energy.