4 ms·

In dual-motor (front, rear) Tesla vehicles, each motor is on a different gear ratio for optimal power bands.

adrianmonk 7y ago
I wonder if this is part of why their dual-motor models get better range. I could see it being better for regenerative braking, too.
- robotresearcher 7y ago
  Double the regenerative braking is why they get better range, I bet, despite being heavier.
  - kwhitefoot 7y ago
    The two motors in a Model S are different ratings. It seems that at cruising speed the car can choose the most efficient one to use and let the other one 'freewheel'. Two motors probably gives better control over regen and certainly over braking but the regen rate seems to be determined by the battery, inverter, and design decisions. In my 2014 Model S 70D the maximum regen is about 50 kW, at least that's what the display shows, but the motors can develop at least 250 kW. I suspect it is also limited for safety reasons, 250 kW of braking would give deceleration of about the same magnitude as the maximum acceleration. At 100 kph (27.8 m/s) the car has an energy of about 1.62 MJ so at 250 kW it would come to a stop in 6.5 seconds. Actually my car does 0 to 100 kph in about 5.6 seconds so it clearly produces more than 250 kW. Sorry for rambling on, your comment set me thinking and then I just had to check my working.
- adrr 7y ago
  Not sure on the S or X but my model 3 AWD has less range than RWD. AWD is quicker by 10%.
  - driverdan 7y ago
    AWD adds more weight and drive train losses.
    - STRML 7y ago
      This is only true on the Model 3. Indeed, on the S, the dual-motor variants were more efficient due to different gearing. It is still unclear the community why the 3 dual motor variants are as much as 10% less efficient. It is not totally accounted for by weight, and the extra induction motor should be capable of torque sleep.
- Whatarethese 7y ago
  The single motors get better range.

I wonder if this is part of why their dual-motor models get better range. I could see it being better for regenerative braking, too.

robotresearcher 7y ago
Double the regenerative braking is why they get better range, I bet, despite being heavier.
- kwhitefoot 7y ago
  The two motors in a Model S are different ratings. It seems that at cruising speed the car can choose the most efficient one to use and let the other one 'freewheel'. Two motors probably gives better control over regen and certainly over braking but the regen rate seems to be determined by the battery, inverter, and design decisions. In my 2014 Model S 70D the maximum regen is about 50 kW, at least that's what the display shows, but the motors can develop at least 250 kW. I suspect it is also limited for safety reasons, 250 kW of braking would give deceleration of about the same magnitude as the maximum acceleration. At 100 kph (27.8 m/s) the car has an energy of about 1.62 MJ so at 250 kW it would come to a stop in 6.5 seconds. Actually my car does 0 to 100 kph in about 5.6 seconds so it clearly produces more than 250 kW. Sorry for rambling on, your comment set me thinking and then I just had to check my working.
adrr 7y ago
Not sure on the S or X but my model 3 AWD has less range than RWD. AWD is quicker by 10%.
- driverdan 7y ago
  AWD adds more weight and drive train losses.
  - STRML 7y ago
    This is only true on the Model 3. Indeed, on the S, the dual-motor variants were more efficient due to different gearing. It is still unclear the community why the 3 dual motor variants are as much as 10% less efficient. It is not totally accounted for by weight, and the extra induction motor should be capable of torque sleep.
Whatarethese 7y ago
The single motors get better range.