|
quote:smart talk I live in San Francisco, and I once saw a smart driver trying to parallel park in a spot too short for his car. An actual parking spot opened up, and when the driver got out of his car, I realized that the guy was 6'8" or taller, and a muni driver to boot. quote:EVs I'm curious about different power train configurations in EVs. It seems like there is so much potential in something like an active wheel in terms of simplicity of vehicle layout and construction, not to mention amazing all-wheel drive awesomeness. Why haven't we seen this on a production car yet? Extra useful on a small car, I would think.
|
#
¿
Jan 22, 2012 21:51
|
|
|
|
| # ¿ May 7, 2024 06:07 |
|
|
wolrah posted:The typical problem with motor-in-wheel designs is unsprung mass. Basically it's anything in the suspension or drivetrain that moves with the tire when going over a bump rather than moving with the chassis. Greater unsprung mass means the tire and suspension assembly can not react as quickly to changes in the road, so not only are more bumps transferred to the vehicle but the tire is also not kept in as firm of contact with the road while going over bumpy surfaces resulting in reduced traction and negative handling effects. The unsprung mass would be a problem on in-wheel-motor cars with traditional suspensions, but the active wheel seems like it has the potential to nullify unsprung mass or even reduce it. Are there limitations of an active suspension that I'm not thinking of? Off the top of my head the only thing I can think of is a limited amount of travel, but then you just need to make the wheel bigger. Maybe the future of EV's is in 22" Rimzz. wikipedia posted:. . . replace the cast iron friction brake assembly with a wheel motor assembly of similar weight. This results in no net gain in unsprung weight and a car capable of braking up to 1G. A good example of this is the Michelin Active Wheel motor as fitted to the Heuliez Will that results in an unsprung weight of 35 kg on the front axle which compares favorably to a small car such as a Renault Clio that has 38 kg of unsprung weight on its front axle. Colonel Sanders posted:I think what I would be most worried about is the performance of an a large inboard electric motor vs a tiny wheel motor. I'd rather have four motors that put out equal HP to one big one and ditch the axels and so on.
|
|
#
¿
Jan 23, 2012 22:07
|
|