Automotive Engineering - August 2021 - 16

Making the case for
IN-WHEEL
MOTORS
Elaphe IWM at left. Lordstown
Endurance electric pickup
(below) uses one per corner.
Some possible
E-AWD
architectures.
from this testing have been used to improve durability by ensuring adequate
water sealing (and electrical isolation) and corrosion resistance.
Protection from road debris is also critical for the otherwise exposed
high-power cabling and cooling lines. Liquid cooling is required
to protect the IWM from excessive heating that is exacerbated
by proximity to radiant brake-rotor heat in worst-case conditions
(e.g., no regenerative braking, extreme hot weather, motors
caked with mud). In terms of electrical safety, failure of one IWM
must trigger a shutdown within milliseconds of the other side's motor
to prevent adverse torque steer; loss of overall power could
16 July/August 2021
result in reduced speed, but this may only be noticeable
under high-load conditions. Although IWMs provide
new challenges for vehicle integration, there has
been sufficient design, development and testing over
the last 20 years to provide a solid basis for their consideration
for vehicle production.
Beyond technical concerns, IWM adoption has been
hindered by several other factors. For example, EVs are
only now approaching cost-competitiveness with ICEpowered
vehicles, so there has been little incentive to
AUTOMOTIVE ENGINEERING
FROM TOP LEFT: ELAPHE; LORDSTOWN MOTORS; CHRIS BORRONI-BIRD

Automotive Engineering - August 2021

Table of Contents for the Digital Edition of Automotive Engineering - August 2021

Automotive Engineering - August 2021 - SPONSOR1
Automotive Engineering - August 2021 - CVR1
Automotive Engineering - August 2021 - CVR2
Automotive Engineering - August 2021 - 1
Automotive Engineering - August 2021 - 2
Automotive Engineering - August 2021 - 3
Automotive Engineering - August 2021 - 4
Automotive Engineering - August 2021 - 5
Automotive Engineering - August 2021 - 6
Automotive Engineering - August 2021 - 7
Automotive Engineering - August 2021 - 8
Automotive Engineering - August 2021 - 9
Automotive Engineering - August 2021 - 10
Automotive Engineering - August 2021 - 11
Automotive Engineering - August 2021 - 12
Automotive Engineering - August 2021 - 13
Automotive Engineering - August 2021 - 14
Automotive Engineering - August 2021 - 15
Automotive Engineering - August 2021 - 16
Automotive Engineering - August 2021 - 17
Automotive Engineering - August 2021 - 18
Automotive Engineering - August 2021 - 19
Automotive Engineering - August 2021 - 20
Automotive Engineering - August 2021 - 21
Automotive Engineering - August 2021 - 22
Automotive Engineering - August 2021 - 23
Automotive Engineering - August 2021 - 24
Automotive Engineering - August 2021 - 25
Automotive Engineering - August 2021 - 26
Automotive Engineering - August 2021 - 27
Automotive Engineering - August 2021 - 28
Automotive Engineering - August 2021 - 29
Automotive Engineering - August 2021 - 30
Automotive Engineering - August 2021 - 31
Automotive Engineering - August 2021 - 32
Automotive Engineering - August 2021 - 33
Automotive Engineering - August 2021 - CVR4
https://www.nxtbook.com/smg/sae/24AE08
https://www.nxtbook.com/smg/sae/24AE06
https://www.nxtbook.com/smg/sae/24AE05
https://www.nxtbook.com/smg/sae/24AE04
https://www.nxtbook.com/smg/sae/24AE03
https://www.nxtbook.com/smg/sae/24AE02
https://www.nxtbook.com/smg/sae/23AE12
https://www.nxtbook.com/smg/sae/23AAVE11
https://www.nxtbook.com/smg/sae/23AE10
https://www.nxtbook.com/smg/sae/23AE09
https://www.nxtbook.com/smg/sae/23AE08
https://www.nxtbook.com/smg/sae/23AAVE07
https://www.nxtbook.com/smg/sae/23AE06
https://www.nxtbook.com/smg/sae/23AE05
https://www.nxtbook.com/smg/sae/23AAVE04
https://www.nxtbook.com/smg/sae/23AE04
https://www.nxtbook.com/smg/sae/23AE03
https://www.nxtbook.com/smg/sae/23AE02
https://www.nxtbook.com/smg/sae/23AAVE01
https://www.nxtbook.com/smg/sae/22AE12
https://www.nxtbook.com/smg/sae/22AVE11
https://www.nxtbook.com/smg/sae/22AE10
https://www.nxtbook.com/smg/sae/22AE09
https://www.nxtbook.com/smg/sae/22AE08
https://www.nxtbook.com/smg/sae/22AVE07
https://www.nxtbook.com/smg/sae/22AE06
https://www.nxtbook.com/smg/sae/22AE05
https://www.nxtbook.com/smg/sae/22AVE04
https://www.nxtbook.com/smg/sae/22AE04
https://www.nxtbook.com/smg/sae/22AE03
https://www.nxtbook.com/smg/sae/22AE02
https://www.nxtbook.com/smg/sae/22AVE01
https://www.nxtbook.com/smg/sae/21AE12
https://www.nxtbook.com/smg/sae/21AVE11
https://www.nxtbook.com/smg/sae/21AE10
https://www.nxtbook.com/smg/sae/21AVE09
https://www.nxtbook.com/smg/sae/21AE09
https://www.nxtbook.com/smg/sae/21AE08
https://www.nxtbook.com/smg/sae/21AVE07
https://www.nxtbook.com/smg/sae/21AE06
https://www.nxtbook.com/smg/sae/21AE05
https://www.nxtbook.com/smg/sae/21AVE05
https://www.nxtbook.com/smg/sae/21AE04
https://www.nxtbook.com/smg/sae/21AE03
https://www.nxtbook.com/smg/sae/21AVE03
https://www.nxtbook.com/smg/sae/21AE02
https://www.nxtbookmedia.com