|
We've hashed this out before, but here are the problems with hub motors:
Hub motors have to handle huge amounts of current, since they're at a fixed 1:1 ratio with the wheels. That means lots of low-end torque, and thus heavier insulation than a motor with reduction gear.
As part of the unsprung weight of the wheel, the hub motor must be able to withstand road impacts directly. Thus, stronger construction and even more weight.
Because it's outboard and in the wheel, the hub motor must be sealed to prevent dirt, water and junk from getting into the unit. A sealed unit is much more difficult to cool properly.
The Hi-Pa motor weighs 66 pounds. 4 x 66 = 264 pounds. You could install two Warp 9 motors for that much weight and get far more power.
BTW, the Tesla doesn't use hub motors. It uses a single AC drive motor coupled to a fixed 8.28:1 gearbox, so it still has axles.
|