There are pros and cons to each approach: "Thus, the induction machine when operated with a smart inverter has an advantage over a DC brushless machine – magnetic and conduction losses can be traded such that efficiency is optimized. This advantage becomes increasingly important as performance is increased. With DC brushless, as machine size grows, the magnetic losses increase proportionately and part load efficiency drops. With induction, as machine size grows, losses do not necessarily grow. Thus, induction drives may be the favored approach where high-performance is desired; peak efficiency will be a little less than with DC brushless, but average efficiency may actually be better."
It's complicated and there are many factors. This section from the article I linked has some of them: "In contrast, induction machines have no magnets and B fields are “adjustable,” since B is proportionate to V/f (voltage to frequency). This means that at light loads the inverter can reduce voltage such that magnetic losses are reduced and efficiency is maximized. Thus, the induction machine when operated with a smart inverter has an advantage over a DC brushless machine – magnetic and conduction losses can be traded such that efficiency is optimized. This advantage becomes increasingly important as performance is increased. With DC brushless, as machine size grows, the magnetic losses increase proportionately and part load efficiency drops. With induction, as machine size grows, losses do not necessarily grow. Thus, induction drives may be the favored approach where high-performance is desired; peak efficiency will be a little less than with DC brushless, but average efficiency may actually be better."
The Tesla has an AC induction motor (invented by Nicolai Tesla) which is just steel and copper. No rare earth magnets... no magnets at all. It's about time the rest of the auto industry woke up and started putting some "advanced technology" in their fossil fuel powered cars. https://www.teslamotors.com/bl...
I didn't RTFA but Tesla tracks all cars in real time. They have observed that cars on Autopilot are half as likely to have an accident (as measured by air bag deployment).
I think that it's not just Harry Reid. A lot of people in Nevada are opposed to having their state be a nuclear waste dump. Unfortunately, this highlights another problem with nuclear power which is what to do with the radioactive waste that nobody wants.
The older study is of hybrid cars, not battery EVs. Hybrid cars have an IC engine and only marginal electric use. More relevant studies of BEVs vs ICE shows a slight increase in manufacturing CO2 (15-45% depending on model) which is quickly eliminated by electric efficiency and reduced CO2. Electric cars emit about half the CO2 over their lifetime compared to an ICE car. http://www.ucsusa.org/clean-ve... http://www.greencarreports.com...
If you're worried about your taxes, most of the dollars go to support endless war in the middle east. If we didn't "need" the oil, we wouldn't "need" the war.
Just... wrong. Even if you get all of your electricity from dirty coal (like Colorado), it is still cleaner to drive an electric vehicle than a 35 mpg gas car because coal fired power plants are much more efficient than gas or diesel car engines and electric cars are much more efficient in using that electricity. Plus, as we retire dirty coal plants, electric cars get even cleaner. http://www.ucsusa.org/clean-ve...
Slashdot Mirror
There are pros and cons to each approach:
"Thus, the induction machine when operated with a smart inverter has an advantage over a DC brushless machine – magnetic and conduction losses can be traded such that efficiency is optimized. This advantage becomes increasingly important as performance is increased. With DC brushless, as machine size grows, the magnetic losses increase proportionately and part load efficiency drops. With induction, as machine size grows, losses do not necessarily grow. Thus, induction drives may be the favored approach where high-performance is desired; peak efficiency will be a little less than with DC brushless, but average efficiency may actually be better."
It's complicated and there are many factors. This section from the article I linked has some of them:
"In contrast, induction machines have no magnets and B fields are “adjustable,” since B is proportionate to V/f (voltage to frequency). This means that at light loads the inverter can reduce voltage such that magnetic losses are reduced and efficiency is maximized. Thus, the induction machine when operated with a smart inverter has an advantage over a DC brushless machine – magnetic and conduction losses can be traded such that efficiency is optimized. This advantage becomes increasingly important as performance is increased. With DC brushless, as machine size grows, the magnetic losses increase proportionately and part load efficiency drops. With induction, as machine size grows, losses do not necessarily grow. Thus, induction drives may be the favored approach where high-performance is desired; peak efficiency will be a little less than with DC brushless, but average efficiency may actually be better."
Great idea to allow an external device to automatically install software on your computer.
What are these people thinking?... or not...
The Tesla has an AC induction motor (invented by Nicolai Tesla) which is just steel and copper. No rare earth magnets... no magnets at all.
It's about time the rest of the auto industry woke up and started putting some "advanced technology" in their fossil fuel powered cars.
https://www.teslamotors.com/bl...
My wife likes Autopilot... she doesn't have to nag me as much.
I didn't RTFA but Tesla tracks all cars in real time. They have observed that cars on Autopilot are half as likely to have an accident (as measured by air bag deployment).
We get a lot of pine pollen coating the panels in the spring. Need to hose them every week. Other than that,they maintain peak production.
The space needle has always been ugly. Time to tear it down.
Most trains in Europe (local and intercity) are electric. Only in the US is this considered novel.
My wife bought shoes.
I received a $64 credit on Amazon today.
The second amendment has outlived its usefulness. Time to repeal it.
But does it run on Linux?
Looks like JScript (Windows only).
Clueless rich white guy doesn't know that Bolivia has chickens.
Just Google word definitions
The Arabic source, al-Kwarizm ‘the man of Kwarizm’ (now Khiva), was a name given to the 9th-century mathematician Ab Jafar Muhammad ibn Msa.
I think that it's not just Harry Reid. A lot of people in Nevada are opposed to having their state be a nuclear waste dump.
Unfortunately, this highlights another problem with nuclear power which is what to do with the radioactive waste that nobody wants.
The older study is of hybrid cars, not battery EVs. Hybrid cars have an IC engine and only marginal electric use.
More relevant studies of BEVs vs ICE shows a slight increase in manufacturing CO2 (15-45% depending on model) which is quickly eliminated by electric efficiency and reduced CO2. Electric cars emit about half the CO2 over their lifetime compared to an ICE car.
http://www.ucsusa.org/clean-ve...
http://www.greencarreports.com...
Sorry, didn't mean to pick on Colorado. The EIA shows Colorado as having a high percentage from coal.
Good to see the percentage of renewables rising.
I run my Tesla on electricity from my solar panels so very low emissions (and low cost, too).
If you're worried about your taxes, most of the dollars go to support endless war in the middle east. If we didn't "need" the oil, we wouldn't "need" the war.
The IMF is a reputable organization.
http://www.imf.org/external/pu...
You, on the other hand, are just some random person on the internet.
What! We still have whales that we haven't killed?
When taxpayers stop spending $5.3 trillion a year to subsidize fossil fuels, I'll start to worry about renewable subsidies.
Just... wrong.
Even if you get all of your electricity from dirty coal (like Colorado), it is still cleaner to drive an electric vehicle than a 35 mpg gas car because coal fired power plants are much more efficient than gas or diesel car engines and electric cars are much more efficient in using that electricity.
Plus, as we retire dirty coal plants, electric cars get even cleaner.
http://www.ucsusa.org/clean-ve...