Audi e-tron Electric Motor Explored: Video

FEB 8 2019 BY MARK KANE 46

Audi knows how amazing electric motors are compared to internal combustion engines

In one of the latest promotional videos about the Audi e-tron, the German manufacturer briefly presents the “Electric Engine” or rather electric motor with power electronics and a single-speed transmission.

Audi engineer Joachim Doerr discusses the nuances like use of asynchronous motors, which don’t contain permanent magnets, efficient cooling to provide repeatable maximum acceleration (15-20 times in a row), and torque distribution between the axles with two separate electric motors – one per axle.

The development on the Audi e-tron, as we see it today, started around five years ago.

Audi e-tron specs:

  • 0-60 mph in 5.5 seconds or 0-100 km/h  in 5.7 seconds
  • Top speed – 124 mph
  • up to 417 km (259.1 miles) under WLTP test cycle
  • 95 kWh battery (36 cell modules, each module is equipped with 12 pouch cells, nominal voltage of 396 volts)
  • battery pack weight: 700 kilograms (1543.2 lb)
  • dual-motor all-wheel drive – up to 300 kW and 664 Nm in S mode (boost) or up to 265 kW and 561 Nm in D mode. Front motor is 135 kW, the rear is 165 kW (S mode).
  • Maximum tow rating – 1,800 kg (4,000 pounds) when properly equipped
  • 9.6 kW on-board charger (240 V, 40 A) in U.S. and 11 kW or 22 kW three-phase in Europe
  • DC fast charging up to 150 kW: 0-80% in 30 minutes

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46 Comments on "Audi e-tron Electric Motor Explored: Video"

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Blah ber dee blah ber dee blah!

The efficiency on the e-con is probably the worst of any electric vehicle on the market. If I was an engineer behind this embarrassment I’d be keeping a low profile

Hurry hurry hurry there’s an article that isn’t about Tesla we better jump out there and crap on it… It is way more efficient than its gasoline counterpart isn’t it? I thought we were trying to get past the point where electric cars were just 4 hardcore Greenies and want them to be accepted by the General Public who obviously don’t care about efficiency as much seeing as half of them ride around in giant tanks that get 10 miles to the gallon. I’m sure if they shaped it to look like a giant anal suppository it would be more efficient….

Didn’t you get the memo? The only reason to buy an $80,000 Audi SUV is efficiency!

Mind blowing, isn’t it?

I suppose all these people who yell about efficiency over everything used to only ride mopeds before Tesla…

No, they used to drive Prius. Tesla told us already.

We will have to wait and see what MPGe rating is, certainly the worst EV is the GLE550e at 43 MPGe combined. If this does 220 EPA (guess based off WLTP) and charges 0-80% in 30 min at 150 kW, that means it takes 75 kWh of power, at say 95% efficient charging is 70 kWh into the battery, that is about 88 kWh usable from the pack. Assuming 85% efficiency of power from the wall at L2, that will give it an MPGe of 220/88*.85*33.7=72 MPGe. Jaguar IPace is 76 MPGe. This is low, but not that far off from others (besides the Model X at around 90 MPGe).

It seems the usable part of the battery is about only 83.6 kWh.

Okay, that would put it same as IPace, which is believable. It also explains the rapid charging rate and should be good for battery longevity.

Hey Nono and Vikings 79,

That makes total sense. The way audi gets battery life at those charge rates is 2 limit the usable energy compared to total energy of the pack. An age-old trick

Do you have a legitimate reference that your lower number on kilowatt hours is true?

The ‘Cardriver.com’ site claims only 81 KWh net/usable, most German EV news claim approx 84 KWh net/usable from the 95 KWh gross capacity.

There is definitely a large capacity buffer mainly on top, as Bjorn Nyland could charge at 99% with still 36KW and Bjorn could still push regenerative breaking into the pack when driving at 99%.

Thanks for doing all the math. So if it is 76MPGe I would assume that’s a lot more efficient than most SUVs it’s size and shape so why do so many try to make the perfect the enemy of the good?

Sorry, who needs MPGe? What relevance does that unit have when our goal is to stop burning oil? Should we then talk about battery capacity in gallons-equivalent? I’ll stick to SI, thank you very much.

And in your perfect world, everything is made by Tesla and is painted black and only black. (sic)

Variety is the spice of life. It would be pretty boring if there was no choice in anything now wouldn’t it? There would be only one type of everything on sale in the markets. Everyone would dress identically and carry their ‘thoughts of Chairman Elon’ all the time.

I know I am being sarcastic but this sort of slagging off of anything not made by Tesla is getting beyond a joke. They simply can’t always to everything totally right and I’m sure that the company would admit that so why can’t people do the same eh?

Chairman Elon might not be too far off. Didn’t somebody say that the desire to save the world is usually a false face for the desire to rule it?

Projection?

You referring to me? Nah I don’t even want to be the boss at work and I’m not on Twitter.😂

Lots of German Fans around. You’ll see on time.

You should look at the charging curve of the e-tron, you’ll be amazed how good it is.

Internal combustion engine are much more amazing – they are so complex and full of stuff, … Electric motors are just much better and simple and just perfect for traction – big torque and right from 0 rpms.
Permanent magnet motors are in theory more efficient, they don’t need extra power to create a magnetic field… But it’s more or less irrelevant, electric motors after some size are all extremely efficient, if they are 93% or 89% it’s basically irrelevant…. And i suppose no motor over 50HP achieves less than 90%.

Not an Audi fan, but if these get people out of their LICE gas guzzlers then they are very welcome.

Wow water cooled rotor!

Sorry, what? Admittedly I haven’t watched the video, but how is that supposed to work?

A pump drives water around the motor, taking waste heat away.

They claim, they can do a lot more successive accelerations before the motor overheats compared to other electric cars.

Watch the video.

Have cooling loops running to the stator and rotor.

The rotor can have coolant coming into from the hollow axle.

Racing motors have been using oil cooled rotors before. The winding on the rotor can be made via copper tubes rather than copper wires. But those are expensive to fabricate. Often, they just using cooling plate on the rotor that has liquid running thru it since both copper and aluminum are good heat conductor.

Also, cooling is necessary since PM motors have magnets in them. Heat is one of the biggest enemy to permanent magnets.

Yeah this is an innovation I would guess Audi deserves – that of pumping a small amount of water through the rotor shaft so that the rotor bars do not overheat.

Of course this means ‘shaft seals’ and now you have to worry about your motor ‘leaking glycol’ hehehe… Hope they got THAT end of the problem working ok with decently robust mechanical seals. (They need at least TWO).

I very much doubt anything is “just” water cooled its only this engineer’s English, more likely he should have said liquid coolant.

Ok that is beyond splitting hairs… English isn’t this dude’s first language.

Since the motors are not the prime-mover, I’d say the term ‘engine’ is not the best name for the Dynamo here, but we’ll work with it.

Also it would have been a tad more precise if he stated the 3-phases created a ROTATING magnetic field that the rotor could react against and turn the shaft – but he’s just giving general information here.

Yeah I should have but I was too excited 😀

Yes, that is not surprising.

Motor cooling is often what limits the power rating and what limits how long a car can go around the track.

I am sure the Germans test those cars as SUSTAINED high speed tracks before release the product.

Indeed Audi has tested E-Tron Quattro at Nürburgring Nordschleife.

https://www.youtube.com/watch?v=la03D2Xgbwc

So you need a double clutch for an EV? Great engineering!!!!

I don’t know where you get that from…

Just look at the picture on the head of the article.
You don’t need to read anything.

It shows a single clutch at the end of the axle. That is for “neutral” gear which allows the car to be towed or gliding without any spin of the motor.

Too much alcohol before breakfast doesn’t enhance ‘Reading for Comprehension’.

Breakfast?
Haha you didn’t even now what hour it’s
If you got an alcoholism problem it’s not my fault.

Hahaha!!! Yeah I’ve had drunks tell me I’m too sober all the time! Noted!

“9.6 kW on-board charger (240 V, 40 A) in U.S. and 11 kW or 22 kW three-phase in Europe”
According to the current German pricelist, 22kW 3phase charging isn’t available yet. They said months ago that this option will be available some months later (but IIRC this year).

notting

They have no competitive pressure to provide 22 kw since Tesla discontinued the dual charger models. You guys will just have to ‘suffer along’ at home at a leisurely 11 kw. If its any consolation, Americans will get much less.

The e-tron is an attention-whore. The reason some don’t like this energy hog is exemplified by the video. Audi claims that it’s the best thing since sliced-bread, but the facts point to it being a slipshod attempt at best. Instead of lauding Audi for dipping their toes into electrification, we are criticizing them for NOT doing more!

They assigned a small team of engineers to re-badge an AC Induction motor as an “Asenburneres” motor and then took 4-5 years to make something that’s still slower (lower top speed) and less efficient than the model S that spurred this whole project.

Even now, after the model 3’s sales success, VAG is only allocating 1/3 of their R&D towards electric vehicles: https://insideevs.com/vw-electric-car-investment-one-third-of-total/

How much further do you think VW/Audi/Porsche would be if they devoted 2/3’s or even all their R&D towards electrification instead?! They need to do more. Much like how they didn’t stop diesel development until AFTER they got caught cheating on emissions. They need to stop combustion engine development YESTERDAY. There’s ZERO R&D cost to continuing to build last year’s model.

I believe this car is far larger than an ‘S’. I was very impressed at the SIZE of an I-Pace at the auto show here, and while an Etron wasn’t on display, the Audi guys told me the E-tron is BIGGER, so your comparison is apples to oranges.

Tesla fanboys are just upset that Bjorn said the E-Tron is far quieter than Tesla products. HOW DARE they come out with an EV that sounds more like an EV !!!!!

Great video.

It’s nice to see that they got on board the EV bandwagon.

I like how they are cooling their motor, and the claim of accelerating 0 to 100 km/h up to 10 to 20 times in short succession without overheating.

And doing 20 consecutive 0-100 km/h on day to day driving is behind 99.9% of peoples mind.
So why care?
On the other end, it might make motor last longer, so instead of 1.5 million kilometers, it will last 2 millions more.
The only problem then, is that you would have gone throughout the seat way before.

At the semi reveal in 2017 the roadster did lots of high speed starts and stops all night without any problem this is so far behind Tesla it’s not funny , good start ,buts thats all it is.

As long the Tesla in chill mode is still faster than the Audi, who cares?