 a333A hot cup of integrals please
join:2007-06-12
Rego Park, NY
 ·Cingular Wireless
| reply to DaveDude
Re: i dont see how it will sell ehhh..... you REALLY have absolute no idea how electric cars work do you? The whole reasons gas engines "idle" is because it's damn inefficient to crank them back on with the starter again... essentially, gas engines must be running at a near-constant idling RPM level to create a decently smooth driving experience. In case you don't motice, gas engines also have a VERY narrow efficient RPM "redline" range, hence the reason transmissions exist in the FIRST PLACE. Electric motors on the other hand produce an OBSCENE amount of torque especially at low RPM's making the very point of transmissions moot. The result is that electric (pure electric) vehicles tend to either have direct-drive motors on all 4 wheels, or a central motor connected to the front / rear wheels via a single-stage gearbox and other basic mechanical linkages... no transmission / shifting nonsense. Even reverse gear isn't needed. For AC motors, the controller just reverses the phases. For DC motor systems it's even easier... just reverse the direction of the current going to the motor.
In any case, all this comes down to one thing... electric motors consume precisely ZERO power when at rest... now if you're running accessories like wipers / lights / Air conditioning while stopped in traffic, that's a whole different matter, but that can happen in a gasoline-powered car as well. Either way, the fundamental physics of electric motors means they need NO power while stopped.. there's NO such thing as "idling" on an electric vehicle. (Keep in mind... onboard control electronics will always consume SOME power, but that's sort of negligible AFAIK).
-a333
--
Physics: Will you break the laws of physics, or will the laws of physics break you?
If physicists stand on each other's shoulders, computer scientists stand on each other's toes, and computer programmers dig each other's graves. |
