Cugel wrote:Although I can't find it now, I read an article somewhere on the interweb about future electric cars that talked more about motor development than the usual battery development. Apparently there's a lot of research going on with the motors to basically make them more efficient. One method will see cars with the motors provided as part of the wheels rather than as a separate component ("the engine"). This will make the car waste less energy on transmission losses, as well as providing better traction via control software and sensors that make each wheel motor provide the right degree of drive/traction/regen braking for the conditions that wheel encounters.
There's also moves to simplify the electric motors via 3D printing techniques that make the motor more monolithic instead of a being a group of bolted or wired together components. This will again see less energy loss due to hysteresis currents as well as less heat generation and loss.
I read that very same article.
My take on using 4 hub motors was more for the simplicity.
I initially was thinking about how simple a "car" I could get away with - starting at almost your basic pram wheeled go-kart (albeit using bike wheels).
I figured four 1kw hubs would make for a usable quad type vehicle. But then I started thinking about more serious vehicles, proper welded up chassis and decent hubs / brakes etc.
There are a few companies will sell you hub motors ready to go in such a vehicle.
Not that I'm short of ideas I'd like to play with so I suspect it'll be never be more than a bit of mental entertainment.
I wonder if it would be possible to get a simple quad using bicycle wheels/hubs through SVA. The SVA website suggests it would be a "light quadricycle", wonder what limitations that puts on the design...