Quote:
Originally Posted by NeilBlanchard
It takes a transmission specifically designed for electric motors. Regular car transmissions cannot handle the instant torque -- ask the good folks who built the Illuminati '7'. Even the differential was destroyed by the electric motor.
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They started with a METRO transmission/diff neil!!! and put it to a powerplant that does 0-60 in 6 seconds (down from maybe 14 seconds for a stock metro). electric motors don't have some magical "instant torque" that destroys any transmission you show to it, and even if it did, it could be fixed with a software patch to the controller. Plenty of mild EVs on evalbum that are using them.
Quote:
Originally Posted by NeilBlanchard
And Tesla tried a 2-speed transmission, and then discarded it. Direct drive is better, and more efficient.
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better? more efficient? You have not thoroughly analyzed this to make such a blanket statement. Lets look at some of your assumptions:
1. electric cars should have 300HP motors
2. There was no engineering issues in the gearbox
3. Drawing higher currents and providing more cooling (making more heat) is more efficient than having gearing options.
My low power electric scooter was much "better" when I made it a two speed, it could climb hills and had better top speed, trust me on this. Yes there is a fixed efficiency hit for having selectable gears, in this case it is the extra chain and freewheel drag, but that could also be addressed directly (two chains with 4 dog clutches to completely disengage the unused chain and sprockets).
http://ecomodder.com/forum/showthrea...ter-14889.html
Tesla had engineering problems, they really wanted two speeds because that makes sense. Electric motors do not have a flat efficiency curve either and might have to be oversized (inefficient) if they don't have a transmission:
Discussion of the Nissan Leaf Transmission and Efficiency