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Understanding the Tesla Model S Performance motor

I watched 2 YT videos made by a Professor of Auto Technology in a USA Uni.
Well worth a watch but a bit slow at times.
One interesting part was that the 2 bearings that support the motor rotor shaft are ceramic ball bearings.
They run dry with no lubricant and rotate at max of 18,000 RPM.
The rotor weighs around 30kg.


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