IEEE Electrification Magazine - December 2017 - 3

motors for propulsion and lithium-ion
written by Nick Nagel. The author probatteries. In 2016, the company showvides an overview of the actuation syscased the E-Fan Plus aircraft, in which
tems, including primary flight controls,
a range-extending thermal engine is
landing systems, and aircraft brake
added, providing a hybrid capability.
systems. The article addresses the
Siemens designed a 250-kW motor,
challenges and opportunities for traweighing 50 kg, to power a single-proditional engine-driven hydraulics
peller, all-electric aircraft. In this case,
and electrified hydraulic systems,
the motor drives the propeller directly
such as electrohydrostatic actuators
without a gearbox.
and electromechaniIn this issue, we
cal actuators.
In MEA, the power
have seven great arti"Toward Integrated
cles, including ones
Digital
Aircraft Control
system becomes
on e-taxi, electrificaSystems," is by Omid
critical, and the flight
tion of actuator sysBeik and Ali Emadi.
safety is highly related
tems, and generator
The article overviews
to the continuity
options for APUs.
the aircraft central
The first article,
control and processof service of the
"Electric Drives for
ing system (CCPS)
onboard microgrids.
Electric Green Taxiing
concept, advanced
Systems," is written
reduced instruction
by Evgeni D. Ganev. In
set computer (RISC)
this contribution, the author presents
machine (ARM)-based microprocesthe implementation of electric taxisors, and field-programmable gate
ing. Electric taxiing uses electric
arrays (FPGAs) for aerospace applimotors in landing gears to taxi the
cations. The authors illustrate an
aircraft without the use of the main
example of a laboratory prototype
engines. The technology reduces fuel
implementation of a CCPS using two
burn, noise, and emissions.
FPGA and ARM microprocessors, toThen, we have a piece called "Inducgether with their evaluation boards
tion Machine for More Electric Aircraft,"
and other modules.
written by Yijiang Jia and Kaushik
Following this, we offer "Magnetic
Rajashekara. Here, the authors investiSaturation Aids Flux-Weakening
gate the possibility of using induction
Control" by Badr Mansouri and Jérôme
generators for main-engine power genPiaton. The authors explain how the
eration, APU systems, and electrically
need for a compact permanent magdriven actuation systems. They articunet synchronous motor (PMSM) in
late the benefits of using induction
more electric architecture (MEA) afgenerators, which can have major
fects its control. This approach conadvantages compared to permanentsiders the nonlinear behavior of the
magnet generators. In the latter, high
machine due to magnetic saturation.
short circuit currents are a major conThen, based on this fact, they prescern for the generation systems. This is
ent an optimal control strategy
particularly true for the main-engine
allowing for minimization of fuel
power generators, because they are
consumption. Actual data, acquired
involved in the main propulsion.
from a PM drive for aircraft applica"Actuation Challenges in the More
tions, are presented to show the
Electric Aircraft" is our third article,
design procedure.

In MEA, the power system becomes critical, and the flight safety is
highly related to the continuity of
service of the onboard microgrids.
The article "Toward Robust Stability
of Aircraft Electrical Power Systems"
deals with this important topic. The
authors, Sharmila Sumsurooah, Milijana Odavic, Serhiy Bozhko, and Dushan
Boroyevic, describe how the reduction
of greenhouse gas emissions is related to MEA and its power system stability. They show the application of
analysis tools from robust control
theory, and practical examples show
how these tools can be applied to
analyze the stability of the power
converters employed in MEA. This
article will help design engineers optimize converter volume and weight
without jeopardizing safety.
Hydrogen has already been considered in transportation systems
such as electric vehicles and allelectric ships. Hydrogen's role is to
provide either the main or an auxiliary energy source. Our last article
describes how hybrid proton ex change membrane hydrogen (H2 /O2)
fuel cells can be employed in the
context of aviation. The contribution is titled "Power for Aircraft
Emergencies" and is written by
Christophe Turpin, Benoît Morin,
Eric Bru, Olivier Rallières, Xavier
Roboam, Bruno Sareni, Marcos Garcia Arregui, and Nicolas Roux. They
present a typical example of fuel
cells used in MEA to provide an auxiliary hybrid source network for the
emergency power unit. They also
develop a theory to help engineers
design such hybrid networks while
satisfying transport system specifications. This work was supported by
the French Civil Aviation Authority
and Airbus.

IEEE Elec trific ation Magazine / D EC EM BE R 2 0 1 7

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