Automotive Engineering - December 2022 - 17

ROAD READY
The four-door Endurance
impresses as being spoton
for its target market's
expectations.
Wheel motor matters
The in-wheel hub radial-flux, 3-phase
AC synchronous L1500 motors, designed
by Slovenia-based Elaphe, deliver
instantaneous torque directly to
the tire contact patch without the delay
and backlash typical of a driveshaft/
halfshaft layout, Yip explained. The
Endurance in-hub motors generate
1500 Nm (1106 lb-ft) peak, 650 Nm
(479 lb-ft) continuous at 1480 rpm,
according to Elaphe. Power is rated at
440 hp (328 kW).
The hub motors operate on 370V
nominal, provided by a 109-kWh battery
pack that uses LG Chem lithiumion
cells. Lordstown Motors manufactures
the hub motors in-house under
license from Elaphe.
A DC fast-charger will replenish
electrons, from 20% state of charge to
80% SoC, in 45 minutes, Yip said. The
Endurance is capable of 200 miles (321
km) range in moderate average temperatures,
he said.
Each wheel module weighs roughly
34 kg (75 lb); excessive unsprung mass
is the long-argued downside of hubmotor
technology (see July 2021:
https://www.sae.org/news/2021/07/
making-the-case-for-in-wheel-motors).
" During chassis development we found
that because of the battery packs, the
vehicle's actual sprung mass is quite
heavy. So, the sprung-mass-to-unsprung
mass ratio isn't much different
from that of a normal pickup, " Yip said.
" From a tuning standpoint we didn't
have too many problems in establishing
and achieving our ride, handling and
steering targets. "
Lordstown Motors is betting that fleet
customers will be attracted to their EV's
value equation: longer service intervals
compared with ICE-powered pickups,
including less frequent brake pad/rotor
replacement due to the regen. There
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are no driveshafts, CV joints and CV
boots to replace.
The plan is for the Endurance (base
price $65,000 as of November 2022) to
be a multi-hundred-thousand-mile
proposition for fleet owners, Yip confirmed.
He acknowledged that the inhub
motor modules are " a new technology
that does require some service,
such as seal replacement " and that the
company will provide service training.
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http://info.hotims.com/82337-709 https://www.sae.org/news/2021/07/making-the-case-for-in-wheel-motors https://www.sae.org/news/2021/07/making-the-case-for-in-wheel-motors

Automotive Engineering - December 2022

Table of Contents for the Digital Edition of Automotive Engineering - December 2022

Automotive Engineering - December 2022 - INTRO1
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