Tesla Long Range Single Motor - for company cars

[dan_b]

https://www.teslarati.com/tesla-model-3 ... ge-rwd-uk/

This is weird/interesting.
Tesla seems to be re-starting the single motor with bigger battery pack "long range RWD" model, which is the most efficient/longest range configuration, but was only originally available for a short time at launch and was subsequently withdrawn.
The catch - it's only for company car fleets.

[Stinsy]

I thought the dual-motor was more efficient than single because the motors could be geared differently and therefore act as if there is a multi-speed gearbox...

My guess is that single motor allows lower purchase costs and mower insurance costs.

[Mr Gus]

We "kind of" had a parallel discussion to this when we were buying our poor mans tesla..

Single motor, fast enough performance yes?

Standard range+ (as it was) had a real life 215 mie range which when wife went down to the south coast & back in a day typically meant a charge on the way down (securities sake) & possibly one on the way back regardless of distance overall maybe not requiring it, (this was due to making sure wherever she was next day or so there was enough in the tank ,,,due to us only having a granny plug, & work was paying mileage so it was a win win anyway! (info avoids fact blurring)

The dual range motor model had a larger battery but the additional motor added a whopping 215 kg?? to a vehicle typically with one driver & no other occupants the majority of the time = us buying the SR+.

Apply therefore lighter tesla due to one motor, evened out (possibly) by larger battery only & SR+ type speed performance = happier medium of range & road time to atypically lead footed sales personnel.

"HP" performance with one motor likely avoiding incoming tax designations for company vehicles also I'd anticipate, brings down workfleet cost as does single motor.

The only sales guy with a tesla we encountered moaned about having to stop to drive it from round here to wales & back in a day to charge multiple times in their company Y model ..first time BEV driver, used to BMW & AUDI ..so, y'know
(probably also pissed that he couldnt stick fuel in their other vehicle on the sly too

[dan_b]

No - the dual motor models always only get sold with the bigger higher power battery, but actually the single motor configuration will always be more efficient - less weight. I'm not sure if the single motor configuration gets the induction motor or the permanent magnet motor? There is a small efficiency penalty to pay with the PM machine when "freewheeling" as you still get some inductive drag from the magnets rotating, which you don't get from the AC induction devices....

I thought the dual-motor was more efficient than single because the motors could be geared differently and therefore act as if there is a multi-speed gearbox...

My guess is that single motor allows lower purchase costs and mower insurance costs.

[Paul_F]

I thought the dual-motor was more efficient than single because the motors could be geared differently and therefore act as if there is a multi-speed gearbox...

Nope. The front motor is an induction motor, while the back motor is a buried permanent magnet synchronous one. Induction motors are about 85% efficient, compared to 95% for permanent magnet synchronous ones. Tesla use this architecture because permanent magnet machines still have losses when not in use, while induction machines don't.
Essentially this means that the second motor is purely a boost motor used when accelerating hard (when it isn't terribly efficient) and the rest of the time it's just dead weight to lug around.

[Stinsy]

Thanks. I must've fallen for some Tesla fanboi talking shite.

[Mr Gus]

Thank you Paul, beautifully put, .."dead weight"

As I said to the wife, "that's 2 fat bastard me's you'd be lugging about" ..horrendous thoughts of wasted efficiency.

[dan_b]

Although this is actually the approach Tesla has taken with the HGV Semi Truck.
There is a single-motor with gearing for the first driven axle which is used as the high efficiency "highway cruise" drive.
There are two additional higher power, higher torque (Plaid) motors with a lower gearing for the second driven axle, which is used to accelerate. This is then disconnected via a clutch mechanism when in cruise mode.

I thought the dual-motor was more efficient than single because the motors could be geared differently and therefore act as if there is a multi-speed gearbox...

My guess is that single motor allows lower purchase costs and mower insurance costs.

[Mr Gus]

We need animation of the BEV| semi's motor energy process Elon (well y'know of course he visits here under a hidden guise, & not just cos he looks like a picasso portrait brought to life)

[dan_b]

Not an animation, but a deeper explanation with a visual

https://insideevs.com/news/624742/tesla ... or-system/