Re:Belgian startup Magnax has found a way to mass-produce th...
by aidenn0 on Wednesday October 02, 2019 @06:33PM
(#21141504)
I'm going to defend my "only" as at 2kg per wheel it's about 10% of the weight of tires and wheels (presumably disc brakes are also unsprung. so total increase would be less than 10%) of a (stock) BMW 3 series with 16" aluminum alloy wheels[1].
[edit]
Disc brakes add about 9.5kg on the front[2] (maybe half that on the rear?), so a single disc brake rotor weighs more than the entire weight of all 4 motors.
Obviously this is using Magnax's numbers for very large motors and assuming they scale down, which is silly, but clearly there is some weight at which it would make sense, particularly for a non-high-performance vehicle (1 motor per wheel has lots of advantages for handling, but AFAICT this is not unique to in-wheel motors).
[edit]
Disc brakes add about 9.5kg on the front[2] (maybe half that on the rear?), so a single disc brake rotor weighs more than the entire weight of all 4 motors.
Obviously this is using Magnax's numbers for very large motors and assuming they scale down, which is silly, but clearly there is some weight at which it would make sense, particularly for a non-high-performance vehicle (1 motor per wheel has lots of advantages for handling, but AFAICT this is not unique to in-wheel motors).
1: https://www.tirerack.com/wheels/tech/techpage.jsp?techid=108
2: http://www.dbausa.com/brake-discs-is-lighter-better/