Magnetics Business & Technology - January/February 2024 - 16

FEATURE ARTICLE
Vitesco Builds e-Drive Portfolio with New Designs & Semiconductor Supply Chain Deals
" Obviously, the EESM option requires an additional inverter module
to control the coils. Nevertheless, we are really close to an EESM
plug-and-play solution, " Dr. Gerd Roesel, head of innovation in the
lectrification solutions division. There are other advantages, too, he
notes. " When the vehicle is sailing efficiently, the externally excited
machine saves a watt hour of electricity per kilometer because
there is no drag from a permanent magnet field in the rotor, " Roesel
added, " this lowers the power requirement of the drive by up to five
percent without the need for a mechanic decoupling device. "
Rotor has yes-and-no permanent magnet options in new plug-and-play
e-drive design from Vitesco Technologies
Automotive powertrain manufacturer Vitesco Technologies is strategically
building its portfolio of e-drives with new designs - including
one that features a rotor without permanent magnets, and billiondollar
supply chain deals to secure a steady flow of prized silicon
carbide semiconductors for control and charging systems.
Focused on life cycle engineering for enhanced sustainability and
an improved ecological balance sheet, Vitesco engineers have
designed a new rotor without permanent magnets which forms the
core of an externally excited synchronous machine (EESM) that
expands the company's platform of complete axle drive systems.
The design is suited for both main drives and auxiliary drives, plus
it can bring performance benefits. It reduces the rotor costs and
avoids the carbon footprint that comes with mining and processing
the ores. Based in Regensburg, Germany, Vitesco was formerly the
powertrain division of Continental AG and is a top-tier supplier of
drivetrains to the automotive industry.
" Top results in the sustainability and efficiency of electric cars will
be achieved, if the vehicle drive is optimally adjusted to the specific
scenario. The externally excited rotor without permanent magnets is
a particularly sustainable option for our customers. The higher the
performance requirements to the drive, the more economically attractive
EESM technology becomes, " according to Thomas Stierle,
division head of electrification solutions.
Externally excited machines can offer many advantages, figures Vitesco.
Up to now, most electrified cars have synchronous machines
with permanent magnets in the rotor (so-called PSMs, permanent
magnet synchronous motors). They are efficient and were generally
regarded as easier to manufacture than externally excited machines,
which use coils in the rotor to generate the magnetic field.
Vitesco says it has overcome some substantial obstacles to designing
externally excited machines. By harnessing many years of
experience from series application and through targeted design
changes, it became possible to achieve the same performance
class with both technologies (PSM and EESM) - and to use the
existing space in the platform design for both options. By applying a
sophisticated winding principle, the innovative EESM rotor becomes
an economically attractive option within the most recent drive platform.
Especially, when high performance requirements necessitate
a big magnet mass in a PSM, EESM machines can be more affordable
and more sustainable.
ESM option with permanent
magnet-free rotor
PSM option
Vitesco showcased the EESM module recently in Europe at the
Vienna Motor Symposium in April and in North America at the at the
36th EV Symposium & Exposition held in Sacramento, California in
June. It also has been exhibiting other developments in its e-mobility
portfolio, including for e-bikes and fuel cell vehicles:
*
a demo version of its 48-volt system for smaller electric
two-wheelers. It consists of an eDCU (Electric Drive Control Unit)
and a compact powerful electric motor, fitted with a special inductive
rotor position sensor. The system is being developed for series
application within customer projects.
*
a hydrogen leakage sensor that reliably detects even the
smallest amounts of hydrogen in fuel cell systems.
*
an air control valve which, on the other hand, controls the
air flow to the cathode side of the fuel cell.
" As electrification momentum grows, we are excited to provide our
customers with the technical flexibility they need to set their strategies, "
said Anand Gandhi, North America director of technology and
innovation for Vitesco, at the California event. " As a result of our life
cycle engineering, we can provide our customers with sustainable
mobility solutions. "
Semiconductor supply chain deals with ROHM and onsemi
In June, Vitesco secured strategically important capacities in
energy-efficient silicon carbide power semiconductors through a
long-term supply partnership with ROHM - worth over one billion
US dollars until 2030. A development partnership with ROHM which
began in 2020 created the basis for the new supply partnership.
Vitesco advanced inverters with integrated ROHM SiC chips will
be adopted by two customers, to be applied inside electric vehicle
powertrains. Vitesco will start supplying a first series project as
early as 2024.
SiC devices enable the design of particularly efficient power electronics,
such as those needed for electric car inverters. SiC chips
are a key technology, particularly for high voltages and for vehicles
with demanding range targets and optimum overall efficiency. During
the existing development partnership with ROHM the relevant
SiC chips were further optimized for use in automotive inverters.
16 Magnetics Business & Technology * January/February 2024
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Magnetics Business & Technology - January/February 2024

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Magnetics Business & Technology - January/February 2024 - Cover1
Magnetics Business & Technology - January/February 2024 - Cover2
Magnetics Business & Technology - January/February 2024 - Contents
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Magnetics Business & Technology - January/February 2024 - Cover3
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2019septemberoctober
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2017summer
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2012winter
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2011winter
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