Truck & Off-Highway Engineering - December 2021 - 8

TECHNICAL INNOVATIONS
ELECTRIFICATION
Bosch debuts new CV-specific electric motor and inverter
4-8) claiming the designation, according
to Kenny Vieth, president and senior
analyst for ACT Research, a firm that
provides data, industry analysis and
forecasting services for CV and transportation
markets. By 2026, battery-electric
adoption is expected to reach 11%. " But
there are material differences in adoption
between medium-duty Classes 4-7
and heavy-duty Class 8. In the former,
we anticipate sales rising to around 20
percent in 2026 with Class 8 at just 4
percent adoption, " Vieth predicted.
The compact size of Bosch's 230 electric motor
means easy axle integration for front-wheel,
rear-wheel or all-wheel drive configurations.
A new Bosch electric motor paired with
an advanced power inverter bring an integrated
propulsion solution to the commercial
vehicle (CV) market. " Electrification is
the future, and we think there's going to
be a wide variety of e-powertrains for the
medium-duty segment in the very short
term, " said Dr. Shyam Jade with Bosch in
North America.
Jade, a senior engineer of control
system development for electrified
vehicle system engineering, spoke with
Truck & Off-Highway Engineering during
September's Motor Bella event in
Pontiac, Michigan. " This new e-motor
is an enabler, whether it's for a full
electric, a hybrid or a fuel-cell commercial
vehicle, " Jade said. The motor's
debut coincides with the company's
40% investment increase, year-overyear,
in e-mobility.
The 230 motor gets its name from its
stator diameter - 230 mm (9.05-in.).
" The e-motor is slightly bigger than
what you see in a typical passenger
electric vehicle. But it's significantly
smaller than a typical gasoline or diesel
engine, " Jade said, noting the e-motor's
compact size and other attributes will
appeal to the CV market.
Battery-electric CVs are a rarity in
2021, with less than 1% of the mediumduty
and heavy-duty vehicles (Classes
8 December 2021
Bosch's Shyam Jade stands next to the new
230 electric motor for commercial vehicles.
Scalable to Class 8
In the Bosch 230, oil cooling and water
cooling have specific roles. The rotor
and stator are internally oil cooled, and
the active parts are installed in a watercooling
jacket. " Oil cooling really helps
with the heat transfer, " Jade said.
Scalability makes the 230 e-motor
appropriate for a range of CV applications.
" We can size it for light-duty
commercial vehicles, medium-duty
trucks, all the way up to Class 8 semitrucks.
The 230 e-motor stays the same,
but we would make modifications to
scale it, " Jade said. " For really large vehicles,
it might take two of the units. "
Bosch's 230 can provide up to 230
kW (300 hp) of continuous power, an
important asset in medium-duty veThe
Bosch product
portfolio for commercial
vehicles includes an advanced
inverter with silicon carbide technology.
hicles that are on the road for a long
period of time, Jade said. Common usage,
such as towing a payload up a hill,
also requires reliable e-motor power.
Hairpin winding technology helps
achieve high copper fill in the stator.
" With that winding technology, we're
able to reduce significantly the package
size, and we're able to make the e-motor
more power dense, " he said.
Efficiency is a hallmark of the 230
motor with an 800-volt rating. " We get
up to 97 percent efficiency with this
system in terms of converting the electrons
into rotational energy, " Jade said.
That efficiency is significantly higher
than a typical gasoline or diesel engine's
30-40% brake-thermal efficiency.
Efficient SiC inverter
The 230 motor can be paired with
Bosch's advanced inverter with silicon
carbide (SiC). This semiconductor material
improves electrical conductivity.
SiC helps reduce heat losses, enables
higher switching frequencies and improves
the power density versus a traditional
inverter with silicon. " Our inverter
with SiC helps drive inverter efficiencies
above 99 percent and the overall system
efficiencies above 97 percent, "
Jade said. The SiC inverter is a Boschfirst
for the CV market.
E-motor and inverter efficiencies help
increase a vehicle's driving range. " That's
always a concern for our end customers.
You really want to cut down on the energy
losses, and we feel we're doing our
part with this solution, " Jade said.
Kami Buchholz
TRUCK & OFF-HIGHWAY ENGINEERING
ALL IMAGES: BOSCH

Truck & Off-Highway Engineering - December 2021

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - December 2021

Truck & Off-Highway Engineering - December 2021 - CVR4
Truck & Off-Highway Engineering - December 2021 - CVRA
Truck & Off-Highway Engineering - December 2021 - CVRB
Truck & Off-Highway Engineering - December 2021 - CVR1
Truck & Off-Highway Engineering - December 2021 - CVR2
Truck & Off-Highway Engineering - December 2021 - 1
Truck & Off-Highway Engineering - December 2021 - 2
Truck & Off-Highway Engineering - December 2021 - 3
Truck & Off-Highway Engineering - December 2021 - 4
Truck & Off-Highway Engineering - December 2021 - 5
Truck & Off-Highway Engineering - December 2021 - 6
Truck & Off-Highway Engineering - December 2021 - 7
Truck & Off-Highway Engineering - December 2021 - 8
Truck & Off-Highway Engineering - December 2021 - 9
Truck & Off-Highway Engineering - December 2021 - 10
Truck & Off-Highway Engineering - December 2021 - 11
Truck & Off-Highway Engineering - December 2021 - 12
Truck & Off-Highway Engineering - December 2021 - 13
Truck & Off-Highway Engineering - December 2021 - 14
Truck & Off-Highway Engineering - December 2021 - 15
Truck & Off-Highway Engineering - December 2021 - 16
Truck & Off-Highway Engineering - December 2021 - 17
Truck & Off-Highway Engineering - December 2021 - 18
Truck & Off-Highway Engineering - December 2021 - 19
Truck & Off-Highway Engineering - December 2021 - 20
Truck & Off-Highway Engineering - December 2021 - 21
Truck & Off-Highway Engineering - December 2021 - 22
Truck & Off-Highway Engineering - December 2021 - 23
Truck & Off-Highway Engineering - December 2021 - 24
Truck & Off-Highway Engineering - December 2021 - 25
Truck & Off-Highway Engineering - December 2021 - 26
Truck & Off-Highway Engineering - December 2021 - CVR3
Truck & Off-Highway Engineering - December 2021 - CVR4
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