Aussie axial flux wheel motor

That’s very interesting. From the image and details I deduce the following from the Aussie AF motor (AAFM):

  • 28 poles / 14:1 gearing.
  • 95 hp total presumed, therefore 95/4 = 23.75 hp / wheel at 60 mph.
  • Magnets are in a N-S arrangement; not Halbach. The announced OD of tire is 19 inches. Let me reverse that from the image and see what we get:
    • OD of magnets is about 10 inches, with a length about 2 inches. Quick math says the median magnetic radius is 9 inches / 229 mm.
  • At 415 volts (reported in the first video) the Current will be quite low – which is a good thing. Let’s figure that out: 24 hp = 17897 W = 43A @ 415V

The part that is odd is the fixed stator covers about 2/5s of the rotor which means that the rotor is exposed, and I don’t quite understand that. Maybe they employ some sort of mud-wiper to keep the debris clear. Then again - being exposed the rotor will self-cool 8)

Since the stator is external they would have double-sided windings which almost covers the whole wheel. I’d wager the magnets are probably closer to 8 to 10 mm thick given the geometry.

But I’m just guessing. Quite inspiring; it would be fun to see one up close! :)
Thanks for sharing, KF
 
Is it just me, or in the videos does it look like the rotor is warped and wobbly, and in the third video seems to be hiting against the stator? Anybody else make a similar observation?
 
I thought it was excessively noisy but then it looked like a prototype and perhaps the controller was too, so I chalked it up as Beta-Showcase.
~KF
 
From their Website (http://evans-electric.com.au/) Their motor is an Induction motor, the rotor therefore needs cooling and explains the open architecture to allow for air cooling.

-ryan
 
liveforphysics said:
Is it just me, or in the videos does it look like the rotor is warped and wobbly, and in the third video seems to be hiting against the stator? Anybody else make a similar observation?
Click to expand...
It sure looks like the rotor isn't round.
 
Right, it says induction motor. No magnets. I guess you can make an axial flux induction rotor pretty thin. Maybe they didn't figure out that a disc will warp when it gets hot. I wonder how they build the rotor?
 
Kingfish said:
...95 hp total presumed, therefore 95/4 = 23.75 hp / wheel at 60 mph......
Click to expand...

Actually, i think its 95hp (70kW) PER WHEEL ! :shock:

..it would have to be to make that 0-60mph in 3.0 sec's that they claim.

All very nice, but as we keep saying ..motors are not a problem, its battery weight, capacity, size and recharge facilities that are still unsolved for a viable Evehicle ! :roll:
 
Hillhater said:
Kingfish said:
...95 hp total presumed, therefore 95/4 = 23.75 hp / wheel at 60 mph......
Click to expand...

Actually, i think its 95hp (70kW) PER WHEEL ! :shock:

..it would have to be to make that 0-60mph in 3.0 sec's that they claim.

All very nice, but as we keep saying ..motors are not a problem, its battery weight, capacity, size and recharge facilities that are still unsolved for a viable Evehicle ! :roll:
Click to expand...

If so then it's 4 * 43 A = 172 A @ 415 V! Makes for a nice industrial welder :roll:

I wonder how far you could go on that? :?
Confuzzled, KF
 
Kingfish said:
If so then it's 4 * 43 A = 172 A @ 415 V! Makes for a nice industrial welder :roll:

I wonder how far you could go on that? :?
Confuzzled, KF
Click to expand...

well, i guess if you loaded up with 500kg ..($40,000 ?) ...of battery ( Ala Tesla ?) then you should be good for 30mins or so of high power fun.
... but then again , even Ferraris, Buggati's etc can only carry enough fuel for 15-20 mins of full power blasting !
 
well, i guess if you loaded up with 500kg ..($40,000 ?) ...of battery ( Ala Tesla ?) then you should be good for 30mins or so of high power fun.
... but then again , even Ferraris, Buggati's etc can only carry enough fuel for 15-20 mins of full power blasting !
Click to expand...

What - $40k of batteries? I gotta figure this out... :twisted:

If I order from HobbyKing and use LiPo:
  • 415 V / 4.15 V (a good starting cell voltage) = 100 cells => 100 / 5 = 5S * 20 Batts in series
    172 A * 0.5 hours (as suggested) = 86 Ah which does not divide neatly with either 4000, 5000, or 5800 mAh, so let’s just go with 5800 and round up
    86 / 5.8 = 14.8 => 15P
Therefore the Battery Pack is 100S15P ~ Ja! :lol: That’s 20 * 15 = 300 batteries.

I’m thinking 15C would discharge fast enough. Personally - I run Zippy Flightmax 5S1P 5000 mAh. Oh – looks like I can only get the 5800 in a 30C; spendy. Let’s give it a chance:

  • $64.95 * 300 = $19,485.
I think we can get a better deal with the Zippy FM 4S1P 5000 mAh @ $7.50/cell:

  • 100 cells / 4S = 25 Batts in series.
    86 / 5 = 17.2 => 18P
    25 * 18 = 450 batteries @ $30 each = $13,500 for ½ hour of fun! :mrgreen:
BTW – the weight would be 475g each => 213.75 kg or 471 lbs; just over a pound/volt.

But if we have a budget for $40k, how many hours can we buy?

  • 40,000 / (2 * 13.500) = 1.48 hours. Mass would be 633.3 kg or 1396 lbs.
    Unless I’m mistaken I believe the article said 95 hp @ 60 mph, so that’s 60 * 1.48 = ~ 89 miles.

I wonder if HK would discount the price enough to cover shipping with our newly-minted double-diamond discount :?: :wink:
Searchin' for the keys, KF
 
Somewhat related news from a Jaguar C-X75 article on MSNBC today:

Turning out an astounding 770 horsepower and 1,180 pound-feet of torque, the prototype promises to not only be one of the most powerful street-legal automobiles on the planet but one of the fastest, launching from 0 to 60 in less than 3.4 seconds, on the way to a top speed of 205 mph. ... But what stands out more is that the supercar does it on battery power.
...
At street-legal speeds, Jaguar estimates a 68-mile range on batteries alone, with the C-X75 getting at least another 400 miles on a full tank of gasoline.
Click to expand...

For those with disposable income I guess. I mean - why bother to plug it in to charge when it will cause a local black-out? :roll:

Nice-looking car though.
~KF
 
And when the battery charge runs low, the British supercar switches to an alternative power source, a pair of 77-pound micro-turbines that serve as onboard generators. They can provide power to the wheel motors or help recharge the batteries. At street-legal speeds, Jaguar estimates a 68-mile range on batteries alone, with the C-X75 getting at least another 400 miles on a full tank of gasoline.
Click to expand...
I wonder, how large is the gas tank, and what is the efficiency of the "77-pound micro-turbines". Probably would sound cool., especially a pair of turbines running at the same rpm.
 
Cool. It's probably similar to this:Img_5999.jpg

He said it sounds like a jet aircraft when you kick in the turbine. This is a Capstone standby power turbine.
 
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