View Single Post
Old 06-05-2017, 01:37 PM   #9 (permalink)
NeilBlanchard
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,891

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,423
Thanked 2,914 Times in 1,827 Posts
Quote:
Originally Posted by rmay635703 View Post
Hmm gear reduction via planetary?

Anyway RPMs are a hub motor issue but only at startup since you don't have enough torque to start the car rolling

Never heard of top speed as being an issue with hub motors,
I think it is because they want to reduce the weight of the motor units, that requires the reduction gear. They avoid mentioning the reason that weight is the issue - unsprung weight is the main challenge of hub motors.

The obvious answer is to use tandem motors with half shafts. Then you don't have gear losses, and you have much lower unsprung weight, too.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote