Aerospace & Defense Technology - May 2024 - 10

Aerospace Materials
and greater motor lifetime without
mechanical commutation.
Slotless BLDC motors use a cylindrical
ironless coil made in the same winding
technique as ironless DC motors. Using
high energy permanent neodymium
iron-boron or samarium cobalt magnets,
motors with a slotless stator design exhibit
acceptable core losses and stable operation
at high speeds. They have a larger air
gap than slotted BLDC motors, which
minimizes cogging torque while also
reducing noise and vibration. Slotless
BLDC motors generate lower EMI, making
them appropriate for applications where
interference with other avionic devices is
a concern, as well as those requiring high
speeds and fast accelerations.
BLDC slotted motors with a flat outer
Portescap's product portfolio features a variety of slotted and slotless BLDC motors. (Image: Portescap)
perature and vibration requirements. Here
is an overview of common DC motors
along with their advantages for commercial
aerospace applications.
Slotted BLDC motors have coils
inserted in the slots of the stator and
offer a balance of a combination of benefits
that includes high torque density
and maximum speed, long life, low inertia,
efficiency and protection against
shock and vibration. These powerful
motors are designed with thicker teeth
BLDC
Slotted
Torque density
No Load Losses
Max Speed
Cogging Torque
Lifetime
Inertia
Robustness (Shock &
vibration)
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inside the copper windings, thereby creating
a smaller air gap between the iron
and the magnets. Slotted BLDC motors
laminated with stacked steel offer high
efficiency and power density with low
losses and the ability to withstand high
peak torque. Portescap slotted BLDC
motors are designed with windings that
are placed in slots cut axially along the
inner periphery for easier customization.
Additional benefits include the
ability to withstand harsh environments
BLDC
Slotless
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BLDC Slotted
Flat Outer
rotor
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DC Cordless
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rotor are both compact and flat for applications
with tight space requirements.
This rotor configuration delivers high
continuous torque for exceptional power
density and smooth output. These attributes,
as well as easy customization,
make BLDC slotted motors with a flat
outer rotor particularly desirable for
aerospace applications.
DC coreless motors offer many of the
same features of a BLD motor in a compact,
coreless brushed unit. Without a
core, these motors are inherently smaller
and more lightweight than typical DC
motors. They also accelerate faster, produce
less EMI and ambient noise, while
exhibiting smooth operation. In addition,
coreless brushed-type DC motors are not
subject to iron losses and offer lower Joule
heating, resulting in exceptional efficiency.
Portescap's Athlonix™ family has two
series designed to meet specific power,
torque, lifetime and size requirements,
with a host of customization options.
Specify Motors That Comply With
Aerospace Industry Standards
Aerospace environments present
some of the most challenging and
unique environmental operating conditions
for motion components, and
compliance with industry regulations is
a critical aspect of product selection.
Two sets of standards - RTCA DO-160G
and AS9100 - offer designers the assurance
of knowing that their motion systems
can endure and operate safely in
harsh aerospace environments.
Aerospace & Defense Technology, May 2024

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Aerospace & Defense Technology - May 2024

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