Video Summary
Here is the summary of the YouTube video:- All-wheel drive Tesla Model S versions used the same front electric motor through 2018 or 2019, after which Tesla switched to a permanent magnet-based motor.
- The Model S front motor is actually the rear motor from the Model 3, housed in a different case.
- Rear-wheel drive Model S vehicles use a large rear electric motor.
- All-wheel drive Model S vehicles up to 2018 feature two smaller motors, one in the front and one in the rear; the performance version had a large rear induction motor and a small front induction motor.
- All-wheel drive Tesla Model S vehicles from 2019 and later use a permanent magnet motor.
- The front drive unit requires a differential to allow the front wheels to turn at different speeds when cornering, and it has an open-style differential without positive traction or limited slip (traction control is brake-based).
- A high torque multiplication through gear reduction is achieved because a big rotor is used.
- A 3-phase current is used, and there are 48 stator slots to induct the current into the rotor.
- The front motor's shaft grounding ring uses conductive filaments.
- A Mobile SHC 629 synthetic fluid with a poly-alpha-olefins (PAO) base (orange) is used in front drive units up to a certain part number, after which Dexron 6 ATF is employed.
- The lubrication system sprays lubricant onto the rotor bearing and gear from a gear-driven oil pump, and uses coolant on the stators in the transmission heat exchanger, and that the temperature is maintained by the coolant being blown out.
- For the Model S performance versions and above, it was common to have a large rear reduction motor and a small induction motor in the front.
- For the rear drive, they measure the resistance in three different places, and its was between 13.5 to 13.7 milliamps.
- All four rotors from the electric motors of the Model S, Model X, and Model 3 were compared and the differences observed.
