15kw bldc 1.9kg

nechaus

100 kW
Joined
Oct 11, 2011
Messages
1,876
Location
Brisbane > AUSTRALIA
http://www.youtube.com/watch?v=9pL2qDbPqw8


http://www.ebay.com.au/itm/Plettenberg-Predator-37-6-Electric-Brushless-Motor-15kW-Outrunner-BLDC-/251098161962?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item3a769de32a#ht_500wt_925

$999 aud

im tempted
 
15kw out of 1.9kg?

Very skeptical.


Edit: At the very least, I'd be expecting LFP to be running a dual motor drive with two of them, if it was possible for them to be 15kw continuous.
 
Let's say we want 15kw input for 10 seconds. I can't imagine it would be putting out a real power of more than 7kw. So we have 8000 watts over 10 seconds to deal with. How will that effect our engine?

specific heat of copper:
0.39 kilojoule/kg
specific heat of iron:
0.45 kj/kg.

So let's say it's 50% copper 50% iron? Won't make much of a difference, idk if that's realistic.

So effective specific heat of 0.42kj/kg, and 1.9kg.

So we have 80k joules to deal with over those 10 seconds. The motor would jump from 25 celsius to 125 celsius.

Which, is nowhere near the currie point. So, frock, maybe it can do 15kw for a few seconds. I'm still skeptical, but I was expecting to find the napkin calculations to say it's absolutely impossible, but maybe it's not. Still, common, it's an unknown brand selling what looks like a well wound motor but certainly no higher quality than an astro.


Edit: Seriously? An astro is only 1kg? This is looking more and more embarrassing for me as time goes on. Maybe it's not so crazy. Edit2: No, my intuition still says this is absurd and nonsense. Then again, I'm not very good with intuition.
 
fair point, it looks astro quality made, and that's not far from astro cost.
 
Plettenberg are quality motors, and i would not doubt its capable of 15kW ..but its intended for aero use with a dirty big prop forcing a lot of air through it constantly to keep the temp down.
Hence why Plettenberg do not recommend its use for transport applications !
And we all know the issues with ESC's on these big motors when used on EV's.
 
Hillhater said:
Plettenberg are quality motors, and i would not doubt its capable of 15kW ..but its intended for aero use with a dirty big prop forcing a lot of air through it constantly to keep the temp down.

I guess would explain some of the gaps in the windings. I was thinking the copper was pretty spare there, or at least, it was surprising they didn't try slightly fill the gaps (not quite thud-wound). I'm sure because of the thick gauge though that the mass of copper was decent.
 
There is a ultralight with 4 of these motors on it Iirc.... Definitely though they are quality brand, they don't have a shaft exiting the motor however, limits the type of sprocket one could fit...Recumpence I think has/had one while back ...will over a grand new...

KiM
 
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