Let's talk about cars
Jul 22nd 2023, 3:37 pm
#8056
Lost in BE Cyberspace
Joined: Nov 2007
Location: Bay Area, CA
Posts: 13,266
).
Jul 24th 2023, 1:10 am
#8057
Sad old Crinkly Member
Joined: Sep 2003
Location: Tallahassee, Florida
Posts: 807
Jul 24th 2023, 1:11 am
#8058
Sad old Crinkly Member
Joined: Sep 2003
Location: Tallahassee, Florida
Posts: 807
Re: Let's talk about cars
Jul 24th 2023, 5:28 am
#8059
BE Enthusiast
Joined: Jun 2011
Posts: 388
Re: Let's talk about cars
Electric makes sense, but there is a notice on our local parking garage specifically banning Chevy Bolts due to fire-related issues. Might be worth checking your locality first
Jul 24th 2023, 5:37 am
#8060
BE Forum Addict
Joined: Jun 2015
Location: Near Lynchburg Tennessee, home of Jack Daniels
Posts: 1,406
Jul 24th 2023, 12:08 pm
#8061
Lost in BE Cyberspace
Joined: Nov 2007
Location: Bay Area, CA
Posts: 13,266
Re: Let's talk about cars
Oh, boy - that sounds like a lawsuit in the making! With all the pressure to switch to EVs, banning them from parking garages sounds sure to raise a lot of challenges. It reminds me of the situation regarding solar panels a while back. Many HOAs banned them due to both aesthetic reasons and safety reasons, and the state of California overrode such bans; you can no longer prevent solar panels unless there is a very specific reason.
Jul 24th 2023, 10:37 pm
#8062
Joined: Apr 2012
Location: CT
Posts: 33,669
Re: Let's talk about cars
Oh, boy - that sounds like a lawsuit in the making! With all the pressure to switch to EVs, banning them from parking garages sounds sure to raise a lot of challenges. It reminds me of the situation regarding solar panels a while back. Many HOAs banned them due to both aesthetic reasons and safety reasons, and the state of California overrode such bans; you can no longer prevent solar panels unless there is a very specific reason.
Not sure how credible this source is, (first one in my quick search) but there are many others if interested.
ZOMG Why are you so fat?
Jul 25th 2023, 1:29 am
#8063
Forum Regular
Joined: Mar 2017
Location: Elizabethtown, PA
Posts: 74
Re: Let's talk about cars
There are rumblings (heh) of parking garages in danger of collapse due to increased load should electric cars become prevalent.
Not sure how credible this source is, (first one in my quick search) but there are many others if interested.
ZOMG Why are you so fat?
Not sure how credible this source is, (first one in my quick search) but there are many others if interested.
ZOMG Why are you so fat?
Jul 25th 2023, 3:20 am
#8064
Sad old Crinkly Member
Joined: Sep 2003
Location: Tallahassee, Florida
Posts: 807
Re: Let's talk about cars
They no longer spontaneously combust lol
Aug 7th 2023, 4:58 pm
#8065
Lost in BE Cyberspace
Joined: Nov 2007
Location: Bay Area, CA
Posts: 13,266
Re: Let's talk about cars
Have you ever wondered why Tesla's have a 'Dual Motor' badge on them?
I just read this fascinating article about EVs and gearboxes / transmissions. EV Transmissions Are Coming, And It's A Good Thing - CleanTechnica . Apparently no current EV has a 'gearbox', and there are various reasons for this. The simplest answer is, 'they don't need it'. But that's only partly true - the electric motor does have a much wider operating range (RPMs) than an ICE engine, but efficiency still falls off at certain RPMs. But designing a gearbox that can withstand the super-high torque power of an electric motor is apparently not easy.
For cheaper, simpler EVs, having just one 'gear ratio' is ok. The top speed on a Chevy Bolt is apparently around 90mph, which is good enough. But Tesla wanted to have higher speeds, but could not design a sufficiently robust gearbox so - that's where they came up with the 'Dual Motor' idea. They have one motor driving the rear wheels which has its gearing ratios optimized for lower speeds, then it has a second motor driving the front wheels that is geared for higher speeds. As the vehicle speeds up, power is transitioned from the rear wheels to the front wheels, indirectly implementing the same outcome as a gearbox with multiple ratios. But apparently, there are numerous 'performance' EVs in the works now (Porsche, etc).
The observation I have is - having 'dual motors' means you can implement four wheel drive very nicely. Are electric motors fundamentally more complicated than transmissions?
I just read this fascinating article about EVs and gearboxes / transmissions. EV Transmissions Are Coming, And It's A Good Thing - CleanTechnica . Apparently no current EV has a 'gearbox', and there are various reasons for this. The simplest answer is, 'they don't need it'. But that's only partly true - the electric motor does have a much wider operating range (RPMs) than an ICE engine, but efficiency still falls off at certain RPMs. But designing a gearbox that can withstand the super-high torque power of an electric motor is apparently not easy.
For cheaper, simpler EVs, having just one 'gear ratio' is ok. The top speed on a Chevy Bolt is apparently around 90mph, which is good enough. But Tesla wanted to have higher speeds, but could not design a sufficiently robust gearbox so - that's where they came up with the 'Dual Motor' idea. They have one motor driving the rear wheels which has its gearing ratios optimized for lower speeds, then it has a second motor driving the front wheels that is geared for higher speeds. As the vehicle speeds up, power is transitioned from the rear wheels to the front wheels, indirectly implementing the same outcome as a gearbox with multiple ratios. But apparently, there are numerous 'performance' EVs in the works now (Porsche, etc).
The observation I have is - having 'dual motors' means you can implement four wheel drive very nicely. Are electric motors fundamentally more complicated than transmissions?
Aug 8th 2023, 8:00 am
#8067
DE-UK-NZ-IE-US... the TYP
Joined: Mar 2010
Posts: 2,872
Re: Let's talk about cars
Have you ever wondered why Tesla's have a 'Dual Motor' badge on them?
I just read this fascinating article about EVs and gearboxes / transmissions. EV Transmissions Are Coming, And It's A Good Thing - CleanTechnica . Apparently no current EV has a 'gearbox', and there are various reasons for this. The simplest answer is, 'they don't need it'. But that's only partly true - the electric motor does have a much wider operating range (RPMs) than an ICE engine, but efficiency still falls off at certain RPMs. But designing a gearbox that can withstand the super-high torque power of an electric motor is apparently not easy.
For cheaper, simpler EVs, having just one 'gear ratio' is ok. The top speed on a Chevy Bolt is apparently around 90mph, which is good enough. But Tesla wanted to have higher speeds, but could not design a sufficiently robust gearbox so - that's where they came up with the 'Dual Motor' idea. They have one motor driving the rear wheels which has its gearing ratios optimized for lower speeds, then it has a second motor driving the front wheels that is geared for higher speeds. As the vehicle speeds up, power is transitioned from the rear wheels to the front wheels, indirectly implementing the same outcome as a gearbox with multiple ratios. But apparently, there are numerous 'performance' EVs in the works now (Porsche, etc).
The observation I have is - having 'dual motors' means you can implement four wheel drive very nicely. Are electric motors fundamentally more complicated than transmissions?
I just read this fascinating article about EVs and gearboxes / transmissions. EV Transmissions Are Coming, And It's A Good Thing - CleanTechnica . Apparently no current EV has a 'gearbox', and there are various reasons for this. The simplest answer is, 'they don't need it'. But that's only partly true - the electric motor does have a much wider operating range (RPMs) than an ICE engine, but efficiency still falls off at certain RPMs. But designing a gearbox that can withstand the super-high torque power of an electric motor is apparently not easy.
For cheaper, simpler EVs, having just one 'gear ratio' is ok. The top speed on a Chevy Bolt is apparently around 90mph, which is good enough. But Tesla wanted to have higher speeds, but could not design a sufficiently robust gearbox so - that's where they came up with the 'Dual Motor' idea. They have one motor driving the rear wheels which has its gearing ratios optimized for lower speeds, then it has a second motor driving the front wheels that is geared for higher speeds. As the vehicle speeds up, power is transitioned from the rear wheels to the front wheels, indirectly implementing the same outcome as a gearbox with multiple ratios. But apparently, there are numerous 'performance' EVs in the works now (Porsche, etc).
The observation I have is - having 'dual motors' means you can implement four wheel drive very nicely. Are electric motors fundamentally more complicated than transmissions?
For the CT they will have a tri-motor and late maybe a quad…
Where are each of the motors placed on Tesla Tri Motor AWD vehicles?
“One at the front, integrated with a differential, on the centreline of the car in between the front wheels and driving the front wheels via driveshafts, exactly the same as a front wheel drive car. Two at the rear driving the rear wheels.”
Aug 8th 2023, 4:55 pm
#8068
Lost in BE Cyberspace
Joined: Nov 2007
Location: Bay Area, CA
Posts: 13,266
Re: Let's talk about cars
but a dual motor still has a drive shaft on both axels.
For the CT they will have a tri-motor and late maybe a quad…
Where are each of the motors placed on Tesla Tri Motor AWD vehicles?
“One at the front, integrated with a differential, on the centreline of the car in between the front wheels and driving the front wheels via driveshafts, exactly the same as a front wheel drive car. Two at the rear driving the rear wheels.”
For the CT they will have a tri-motor and late maybe a quad…
Where are each of the motors placed on Tesla Tri Motor AWD vehicles?
“One at the front, integrated with a differential, on the centreline of the car in between the front wheels and driving the front wheels via driveshafts, exactly the same as a front wheel drive car. Two at the rear driving the rear wheels.”
Aug 8th 2023, 11:26 pm
#8069
BE Forum Addict
Joined: Jul 2015
Location: Panama City, FL
Posts: 2,126
Re: Let's talk about cars
CT? I tried Google but it's such a popular abbreviation for Connecticut, I couldn't get beyond that. Is it a new model? I googled Tesla three motor and came up with this - https://www.roadandtrack.com/new-car...thing-we-know/ .
Aug 9th 2023, 7:39 am
#8070
DE-UK-NZ-IE-US... the TYP
Joined: Mar 2010
Posts: 2,872
Re: Let's talk about cars
CT? I tried Google but it's such a popular abbreviation for Connecticut, I couldn't get beyond that. Is it a new model? I googled Tesla three motor and came up with this - https://www.roadandtrack.com/new-car...thing-we-know/ .
