Soldato
The motor output is multiplied in an ev. The motor is spinning at >10,000 rpm - the wheels are not.
When are you going fully electric?
- Thread starter Ricochet J
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Ice don’t have regen braking so no idea what that quick google was about.
EVs do. I was moaning that EV's should be the perfect towing car (range excluded) but (most) EVs have appalling towing weights. A quick google shows its down the regen braking, not lack of gears etc.
What are you talking about?
Does it then give more torque than an EV??
Plus plenty of ICE cars with 3,500kg towing weights (UK max) with no low box so its not a requirement to achieve max towing weight.
the fact a ICe doesn’t have regen but can tow. So regen is irrelevant. Once regen is maxed out friction brakes take over. Just like a ICE. Adding bigger brakes for a towing car shouldn’t be too much of an issue. Infact regen is a massive benefit. Especially on a 800v architecture as all that energy is going back into the battery rather than heating disks. A taycan can mac regen 265kW just from brakes
we're not talking about efficiency versus ICE -
taycan (and teslas differently ratioed fron/back motors) already help keep the motor in the sweet spot for efficiency, and you need that strategy too, if you are towing a big load,
otherwise you are burning a lot of electrons accelerating up to cruising speed
eg. you can look up some references yourself.
The efficiency of the electric powertrain is the ratio between the energy output of the battery and the energy output of the motor. A ratio of 100% would mean a perfect conversion of the electric energy into mechanical energy… but it is never the case. Many losses happen at different stages in the energy conversion process. The efficiency is not even a constant value. For example, the combined efficiency of eMotor and Inverter is ranging from 60% to 96%, depending on the drive profile, the speed and the torque of the motor and its position on the drivetrain.
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bosch proposing a cvt on the electric motor ! https://www.sae.org/news/2021/04/bosch-cvt-for-evs
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“The advantage of reduced energy consumption is valid at all speeds,” said van Spijk. “Over a reference cycle like WLTP, this means an overall advantage in the magnitude of 2% to 4% depending on vehicle type. At constant-speed driving, this advantage is even larger since the adaptation to the best [motor] efficiency can be held closer. At speeds from 40 to 80 km/h, this leads to an advantage in the magnitude of up to 8% – again, depending on vehicle type.”
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He said the CVT4EV can handle up to 4,000 Nm (2,950 lb-ft) of wheel torque, which helps make the transmission viable into the LCV segment.
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An ICE is 40% efficient at best. Your graph shows ‘low’ as 70%.
And yes there is a benefit of multi speed. But does it outweigh the cost and weight ? 1st gen EV single speed but multi speed motors using wet lubricant technology is the future
And yes there is a benefit of multi speed. But does it outweigh the cost and weight ? 1st gen EV single speed but multi speed motors using wet lubricant technology is the future
Soldato
Orders of magntitude more. They probably won’t do Davis dam though.
Soldato
we're not talking about efficiency versus ICE -
taycan (and teslas differently ratioed fron/back motors) already help keep the motor in the sweet spot for efficiency, and you need that strategy too, if you are towing a big load,
otherwise you are burning a lot of electrons accelerating up to cruising speed
eg. you can look up some references yourself.
The efficiency of the electric powertrain is the ratio between the energy output of the battery and the energy output of the motor. A ratio of 100% would mean a perfect conversion of the electric energy into mechanical energy… but it is never the case. Many losses happen at different stages in the energy conversion process. The efficiency is not even a constant value. For example, the combined efficiency of eMotor and Inverter is ranging from 60% to 96%, depending on the drive profile, the speed and the torque of the motor and its position on the drivetrain.
----
bosch proposing a cvt on the electric motor ! https://www.sae.org/news/2021/04/bosch-cvt-for-evs
...
“The advantage of reduced energy consumption is valid at all speeds,” said van Spijk. “Over a reference cycle like WLTP, this means an overall advantage in the magnitude of 2% to 4% depending on vehicle type. At constant-speed driving, this advantage is even larger since the adaptation to the best [motor] efficiency can be held closer. At speeds from 40 to 80 km/h, this leads to an advantage in the magnitude of up to 8% – again, depending on vehicle type.”
...
He said the CVT4EV can handle up to 4,000 Nm (2,950 lb-ft) of wheel torque, which helps make the transmission viable into the LCV segment.
.....
Please don’t attempt to correct me, you have zero credibility on this subject.
I reckon that for most daily driving, torque is what makes a car fun to drive. I love the idea of all that torque and no gearbox to slow it down shuffling gears.
I get about 700Nm from the Polestar 2. Sometimes it can be too much and make passengers feel sick.
Soldato
I have 850Nm in my ICE and cant say it ever made anyone feel sick, it does scare some people though
I know ICE doesnt have regen, thats the issue. Manufacturers say that the regen system on EVs would be overwhelmed by heavier tow weights which is why EVs dont have particularly high towing weights despite me saying they are the ideal towing vehicle. You seem to be arguing against a point I am not making????
Well I asked the question and went looking for an answer on the internet. You tell me why EV's have so comparative low towing weights then please? The only reason I could find was to do with the brake regen systems from googling.
I am open to a better explanation.
We all agree its not from lack of torque. Ev cars have bigger brakes than their eq ICE cars as they have to deal with all that extra weight already. So please educate us all and perhaps then go post an article on the internet so the world will have the answer as well.
Yeah it’s the lack of noise and most EV pitch a fair bit, combined with instant regen when you lift off. This is why I don’t like high regen on EVsI have 850Nm in my ICE and cant say it ever made anyone feel sick, it does scare some people though
Depends on the delivery I guessI have 850Nm in my ICE and cant say it ever made anyone feel sick, it does scare some people though
The P2 is instant 720Nm and holds that until about 80mph, with no drop from gear changes.
Soldato
Ahh ok, makes sense.
Have you got the performance version then ? It won’t hold it that long. They soon hit peak torque and derate due to design and heat. Heat Especially on dry motors
Edit. Found this plot.
Misha Charoudin - My Polestar 2 Gets Performance...
www.polestar-forum.com
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