Magnetics Business & Technology - January/February 2024 - 6

FEATURE ARTICLE
Hyundai Unveils Universal Wheel e-Drive System, Boosts Global EV Manufacturing
Capability
Hyundai and Kia, both brands of Hyundai Motor Group, unveiled
their new universal wheel drive system for electric vehicles in
Korea in November amidst the group's dramatic surge in expansion
of EV manufacturing capability. Uni Wheel is a functionally
integrated wheel drive system that dramatically improves
available space inside an EV by moving the main drive system
components to the vacant space within the wheel hub.
In doing so, the automakers have designed a completely new
structure for the drive system that uses permanent-magnet
in-wheel motors smaller than possible previously. The motors
currently being used for the Uni Wheel are 120kW/220Nm.
nificantly more interior space compared with conventional drive
systems, enabling future mobility products optimized for various
applications.
" We are pleased to showcase innovative ideas that could
become game changers in the future mobility market, " said Jongsool
Park, senior fellow at the Institute of Advanced Technology
Development of Hyundai Motor Group. Uni Wheel uses a special
planetary gear configuration consisting of a sun gear in the center,
four pinion gears on each side and a ring gear surrounding
this arrangement. Power generated by the motor is transmitted to
the sun gear, which in turn engages the pinion gears to rotate the
ring gear. This is connected to the wheel to drive the vehicle.
The pinion gears are connected to each other to form two linkages,
and this multi-link mechanism enables Uni Wheel's multiaxis
movement to allow a wide range of suspension articulation.
A conventional drive system using a regular CV joint suffers from
a decrease in efficiency and durability as the angle of drive shaft
deflection increases when travelling over bumpy, undulating
surfaces. Uni Wheel can transmit power with almost no change
to efficiency regardless of wheel movement.
In internal combustion engine vehicles, power is transmitted
from the engine through the transmission and to the wheels via
drive shafts and constant velocity joints. In EVs, however, the
engine and transmission are replaced by a motor and reduction
gear, but the final method of transmission to the wheels is the
same. Uni Wheel opens new possibilities and enables a flat-floor
configuration by moving the reduction gear inside the wheel
hub, locating a compact individual motor close to each wheel,
reducing the length of the drive shafts. The system frees up sig6
Magnetics Business & Technology * January/February 2024
By moving the reduction gear to the wheel hub, a high reduction
ratio delivers a significant torque output and allows for a more
compact electric motor. With independent control of up to four
efficient electric drive units, the system also allows for improved
torque vectoring to boost dynamic ability and deliver high levels
of steering and driving stability.
In addition to vehicles of various sizes, the system can also be
applied to other types of mobility devices such as wheelchairs,
bicycles and delivery robots. It can be scaled to work with wheel
sizes as small as 4 inches and as large as 25 inches or more.
Its ability to move the rotation axis of the wheel makes it possible
to create forms of personal mobility that can climb stairs as
smoothly as an escalator.
www.MagneticsMag.com
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Magnetics Business & Technology - January/February 2024

Table of Contents for the Digital Edition of Magnetics Business & Technology - January/February 2024

Contents
Magnetics Business & Technology - January/February 2024 - Cover1
Magnetics Business & Technology - January/February 2024 - Cover2
Magnetics Business & Technology - January/February 2024 - Contents
Magnetics Business & Technology - January/February 2024 - 4
Magnetics Business & Technology - January/February 2024 - 5
Magnetics Business & Technology - January/February 2024 - 6
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Magnetics Business & Technology - January/February 2024 - Cover3
Magnetics Business & Technology - January/February 2024 - Cover4
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2019septemberoctober
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2019mayjune
https://www.nxtbook.com/nxtbooks/webcom/magnetics_2019marchapril
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2017summer
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