EV efficiency

For those of us who've never perused fuelly - are the Hyundai owners reporting higher or lower #'s. Reason for the inquiry is that in years past, Hyundai has been known to over state their fuel claims & it would seem incredible they would do that again after previously facing consumer wrath.
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The table is a nice summary of EPA ratings. EPA ratings do not often reflect real world expectations, For example, anecdotal evidence is that the Ioniq is getting far less than the EPA ratings while my Prius Plug-In (with my conservative driving style) and the Model 3 are getting much better than EPA ratings. Some model 3 owners are reporting as few as 20 kWh/100 miles.

The reasons that the model 3 is more efficient than the Model S/X are varied and you have named one of them:

• Permanent magnate motor vs. induction motor
• Improved and different battery chemistry
• Lighter weight
• Better cD (coefficient of aerodynamics)

It is rumored that the inevitable Model S refresh will include the new permanent magnate motors and the newer traction batteries to improve efficiency. We'll see.

 

An induction motor is essentially using electromagnets. So a permanent magnet saves on the energy needed to magnetize the magnets in the induction motor.

There was onceworry over supply and costs for rare earth magnets, which is why the Model S and X use induction ones.

Hyundai got hit over how averages from the tests were determined. After the big fines, the 2016 adjustments to EPA testing rules included clarifications on how those are handled.

The Fuelly numbers aren't as close to the EPA as the Prius is, but the average reported MPG is still over 51, and close to reported gen4 Prius numbers. There seems to be a wider spread to the results for the Ioniq.

 

I wish we could get Tesla's actual monitoring data to see how "real world" MPGe compares.

 

the way tesla encourages people to drive, you would do better to take one for a test drive to get 'your' real world numbers.

 

yep -
& what's old is new again ... the genII Rav4ev had a PM motor, as well as Toyota's original 1990's Rav4ev.
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Bob, do we know what the 2nd Gen Leaf's numbers are? I do know that it does much better at highway speeds.

 

I'd like to chime in here being an owner of 2 different BEV's with varying ranges.

While city economy is important, highway economy is MUCH more important to a BEV considering it almost always takes highway speeds to push the range limits of most BEV's.

 

one thing explained early on was that the model S & X got greater efficiency with all-wheel drive even though it's heavier) opposed to just the rear motor. It was explained that once the load decreased, the system put the big motor to sleep and ran on the much more efficient smaller front motor. However, with the EPA numbers out on the model 3 now, surprisingly there's no difference in it's efficiency from rwd to awd.
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The motor type Tesla uses is sort of a permanent magnet motor.
Tesla has identified it as a Permanent Magnet Switched Reluctance Motor.
Here is an excellent article on it with references to even more detail if you like.
Tesla Model 3 Motor — Everything I've Been Able To Learn About It (Welcome To The Machine) | CleanTechnica

Bob, what does your ‘city efficiency’ tell us? It seems to me it is rather clouded. Why not simply use the epa city efficiency numbers?

 

When they come out, how much lighter will the 'standard 3' be and how does one suppose that this will change the efficiency #'s?

 

Dang!
Tesla Model 3 Motor — Everything I've Been Able To Learn About It (Welcome To The Machine) | CleanTechnica
That was one great article explaining the differences in their newly designed & extra efficient motor!
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One does have to LOVE the irony......

 

It was speculated that the Short Range version of the model 3 will be about 300 - 400 lbs lighter than the long Range version due to a smaller battery pack. Tesla says the Long Range version has 310 mile range (while the EPA says 334 mile range) and the Short Range version 220 mile range (the EPA hasn't tested that model). In my opinion, the Short Range version will have about 240 highway mile range (to match the Bolt's rated range) while driving 65 mph with the 18" aero wheels on flat land with no wind conditions.

 

The thing that jumps out to me is that chart correlates very closely with vehicle weight. Other factors include types of tires, types of rims, state of charge, etc. I'm not sure how to use this chart other than presuming the EPA figures are fair and gathered under the same conditions for a specific car, which Tesla says can vary to some extent based on the variability of a specific electric motor.

 

I was wondering more about efficiency than range, since one (insert air quotes) "presumes" this will be a more apples to apples measurement against other vehicles.

If the 3LR is 130mpge, one wonders what the 3B will be.....

Overall range is a YMMV thing...as we've seen with the Bolt and the Leaf, to cite two opposing examples.