Still waiting for Tesla to publish a 1.5 power/torque graph, but I suspect it may compare something like so:
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Still waiting for Tesla to publish a 1.5 power/torque graph, but I suspect it may compare something like so:
They should use HP to be able to compare the curves to their piston engine competition.
They should also pick a piston engine comparison that is in the same peak HP range as well. otherwise, its a little misleading in my opinon.
Originally Posted by TEG
Still waiting for Tesla to publish a 1.5 power/torque graph, but I suspect it may compare something like so:
Does anyone know if there is an actual efficiency curve published for the Tesla motor, or for any AC or AC vs DC motor. By efficiency curve, I mean a plot showing energy efficiency of the motor vs the motor's rotational speed? Actual data, not theroetical.
Last edited by flabby; 12-01-2008 at 05:23 PM.
I think it tends to be by "load" rather than RPM...
Last edited by TEG; 12-01-2008 at 08:03 PM.
Glad they ~finally~ updated that... About time.
Sill a little misleading. They finally quoted and compared to a comparable piston engine. I wonder if it was from my posts?
After all, its HP that will determine the "Torque" at the rear wheels at any vehicle speed.
Now, the curves are still very inaccurate. look at the tesla torque and power curve. they are actually incorrect at the lower motor speeds. check out torque of 300 vs engine speed of 2000rpm.
Last edited by power; 11-14-2009 at 08:37 AM.
Power, why do you say that's incorrect? It looks right to me.Now, the curves are still very inaccurate. look at the tesla torque and power curve. they are actually incorrect at the lower motor speeds. check out torque of 300 vs engine speed of 2000rpm.
From the chart we see that torque is ~300lb-ft from 0-~5000RPM.Now, the curves are still very inaccurate. look at the tesla torque and power curve. they are actually incorrect at the lower motor speeds. check out torque of 300 vs engine speed of 2000rpm.
At 2000rpm, using T=5252xHP/rpm we get 300=5252xHP/2000 or HP=~115.
Looking at the graph going up from ~2000RPMs I get about 85kW which is ~115hp.
So, the graph looks correct to me and checks out at 2000rpms.
Perhaps you forgot to convert kW to HP?
I think my old guesstimate wasn't too far off (note red and blue lines for 1.5):
The shape of the torque and HP curves were pretty close, but I was a bit low across the board. I was conservative because I averaged between the 288hp quotes and some other that said still 248hp but with more low end torque.
Juicy new motor info page here:
http://www.teslamotors.com/roadster/technology/motor
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