Automotive Engineering - August 2021 - 17

COVER STORY
explore IWM. Even as EVs become fiscally attractive,
however, the separate powertrain, chassis, safety and
design silos of most product-development organizations
make it harder to champion a technology such as
IWM that offers benefits across the vehicle. For example,
IWM costs likely are higher than for a more conventional
electric propulsion system, but at the vehicle
level, the cost of IWM may be attractive. However, since
the choice of propulsion system typically is made by
powertrain-development organizations, a comprehensive
vehicle-level analysis may not be considered.
Near- and long-term advantages
Perhaps the best near-term automotive application for
IWM is the full-size SUV or pickup truck segment,
where low end torque is desirable and expectations
for ride comfort, handling and speed are less demanding
than for cars. Lordstown Motors is electrifying
each corner of its Endurance electric pickup truck with
Elaphe-designed IWMs, making it potentially the first
commercialization of IWM in an automotive application
- if the vehicle launches as planned in late 2021.
There are different ways to enable AWD for this
IWMs (at right) offer
significant packaging advantages vs.
conventional EV drivelines (top) particularly
in 4x4/AWD platform configurations.
AE Momentive Ad 0821.qxp_1/2 Page Horizontal 7/19/21 10:51 AM Page 1
platform. IWMs add motor mass to the vehicle and need additional
HV cabling and multiple inverters (compared to a single- or dualmotor
configuration offering AWD) as well as vehicle structure stiffening
to compensate for greater shock loads. However, because the
mass of parts not required by IWM (transmission, driveshaft, transfer
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Automotive Engineering - August 2021

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Automotive Engineering - August 2021 - SPONSOR1
Automotive Engineering - August 2021 - CVR1
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