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Motors on the Semi tractors. There may be different configurations, so you can select up to 3 choice.What application are we talking here?
Pardon my ignorance, but do you really need an "axel" if you have a drive motor for each wheel?
Exactly what I was thinking when I began reading through this thread. An axle simply adds unnecessary complexity, cost, and maintenance to an EV once you have a project of enough scale to justify putting a drive motor on each wheel. And the final result is no mechanical connection across the vehicle through the axle that would require a differential to allow the drive wheels to turn at different speeds around corners, etc. The motors will simply spin at slightly different speeds as necessary under normal conditions, but could be locked to spin together if needed (similar to windmills locking in phase once they are up to speed). A limited-slip mode could engage 'on the fly'. For someone who has repaired and replaced too many failed Jeep and old Chevy Blazer axles over the years, this is a very refreshing topic and just one more of the many big positives for EV's. No more failed ring and pinion gears, no more U-joint issues, no more leaky seals, no more differential oil............etc, etc. Thanks @TalkingMule
Axels do have the benefit of allowing the use of leaf spring or airbags. Without the steel cross tube, it would need a multi-link.
Having half-shafts allows the motors to be hard mounted to the frame, this provides the counter force to the torque vs the linkage needing to handle acceleration as well as braking (and with regen, braking force can be more directly transmitted to the frame). It also eliminates flex in the power leads to the motor assembly and reduces sprung mass.
The Tesla set up doesn't have the usual ring/pinion since the motor shaft is parallel with the axle. The motor output gear drives the differential ring directly.
Using a solid cross beam that is bent to clear the motors and half shafts may be a good blend. Similar to the solid front beam on some heavy duty trucks.
Could also expand what was formerly the differential and package dual motors as one large assembly, no CVs or U joist needed. Since they are centrally located, it would reduce harness flex and provide more protection than if they were more outboard mounted. Two per axle, with one axle having motor to the front, and one toward the rear? Or both sets in the middle given the wheel spacing? Or even mounted above the axle? That would give space for an under beam for load transfer.
View attachment 248920
It will be interesting.
Honestly? If they do reveal this for the Semi, perhaps the first other Q model will be the pickup or van. For S and X, maybe early 2019, maybe 2020, maybe 2021? I guess it depends how fast they can engineer it and alter the production line / build a new one, and whether that seems like the best use of their capital.So if Tesla does all this engineering and programming to put two drive units on an axle and to optimize torque vectoring, it raise this question:
When will P100Q come out for Models S and X?