I thought there were 4 Model 3 electric motors on the semi, now I see mention of 3? Would seem making two, 2 motor axles the same would be better than a 2 motor and a different 1 motor axle. What is right?
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
3 or 4 electric motors?
- Thread starter iwannam3
- Start date
Better how? It would cost and weigh more and likely be less efficient. How would that be better?
Operator64
Member
The axle housings seem to be the same front axle has 2 motors rear axle has 1, as to why they removed one…..economics, weight, unnecessary, I’m sure that a company full of engineers and more educated about the project are probably doing what’s best for the product they designed.
Watts_Up
Well-Known Member
It would be interesting to know if those 3 motors are induction or permanent magnet motors, or a combination of those.
I think that the two-motor axial use permanent magnet motors and the axial with a single motor uses an induction motor.
So the single axial might be only used to improve acceleration or regenerate braking, or on wet road,
but is shutdown when cruising to improve consumption..
Last edited by a moderator:
I expect the opposite. The single motor will be PM for cruising, and the dual motors will be induction so they can free-wheel when not needed.
Last edited by a moderator:
Operator64
Member
Your breakdown Certainly has merit and sounds like an excellent way to design the system efficiency is key to this beast
Last edited by a moderator:
Watts_Up
Well-Known Member
My though was to be like the Model S Plaid with two PM for propulsion and a single induction motor for extra boost.
Watts_Up
Well-Known Member
The need of two separate motors on the same axial IMO is to prevent from a risk of Jackknifing.
Also, a two-motor axial can be used like a locking or limited-slip differential which can be useful on slippery surfaces.
Also, a two-motor axial can be used like a locking or limited-slip differential which can be useful on slippery surfaces.
Last edited:
MobileClimate
Member
The model 3 pm motor is rated at 97% efficiency I don't think you can get any more efficient than that
Operator64
Member
MobileClimate
Member
Operator64
Member
MobileClimate
Member
The top of the chart said 97% 
. Same model 3 hardware..that’s such a game changer to have car and truck hardware the same for serviceability and stocking parts
. Same model 3 hardware..that’s such a game changer to have car and truck hardware the same for serviceability and stocking parts
Operator64
Member
Hmmm they specifically said PLAID motorsThe top of the chart said 97%
They said three plaid motors. One in the rear is used all the time as the 'economy' motor. The other two are actually clutched out until needed for acceleration.
The prototype that was at one of the shareholders meetings a few years ago did have four Model 3 motors.
The prototype that was at one of the shareholders meetings a few years ago did have four Model 3 motors.
bay74
Member
"Stocking" parts? You ever needed service to replace something?!The top of the chart said 97%
I kid I kid. I mean I got my replacement windshield in just four months.
Sort of.
I'm surprised that the plaid motors are cost effective compared with model 3 motors. Clearly they don't cost as much more as one might guess (or at least in the context of the rest of the Semi's costs).
Probably not cost effective but there are now three plaid motors vs four Model 3 motors. One less motor but a similar performance might make it worth it. Not from the few hundred lbs of weight savings, but one less motor and inverter to breakdown. Overall reliability is improved assuming that the Plaid motor/inverter is as reliable as the 3.
Did the presentation actually say what batteries would be in the semi? Everyone expects 4680 but then I heard 2160s somewhere.
Similar threads
