Aerospace & Defense Technology - May 2021 - 8

UAV Propulsion Systems

Magnetic induction: High values
allow the design of electromechanical
devices that will function with greater
force and efficiency.
Flux density: Also known as saturation induction, high flux density allows
the development of a strong magnetic
field that enables the designer to maximize the force that can be applied in an
electromechanical part.

Performance Evaluation
Hiperco has a significantly higher
magnetic flux density than silicon
steel. Both alloys' magnetization curve
shows Hiperco 50A exhibiting a 12%
improvement in saturation magnetic
flux density. The permeability of
Hiperco alloys is also two to four times
higher than standard silicon steel alloys. The flux distribution in the stator

Figure 5. The contnuous power and torque of the motor in the drone operation, which increased by 36%
and 25% respectively.

core delivers a maximum flux density
in the silicon steel core in the 1.9 T
range. In contrast, the Hiperco 50A
core reaches the 2.25 T range (Figure
4). The increase in magnetic flux density helps increase torque. This increase in torque can enable reduced
machine sizes, allowing, for example,
for smaller drones or more payload capacity.
The modeling showed a significant
increase in the motor's performance
using the Hiperco 50A stator core, with
improvement in both continuous
power and torque. The continuous
power of the Hiperco 50A stator improved 36% compared to the silicon
steel core. The continuous torque also
increased by 25% at 2500 rpm speed
(Figure 5). Both performance improvement metrics enable drones with lower
core losses for higher system efficiency
with increased agility.
The peak torque of the motor also increases significantly with the Hiperco
50A stator core. Influencing how
quickly the motor varies the speed of
the propeller for responsiveness is key
and the higher magnetic flux density,
or induction, from the Hiperco 50A
magnetic core enables a 16% peak
torque increase over the silicon steel
stator core. As a drop-in replacement
for silicon steel, Hiperco 50A offers
more torque for more agile drones with
faster acceleration. The Hiperco 50A
core-based motor's power density is

CURRENT REQUIREMENT

BAT TERY

MOTOR

11% power saving
in motor operation

2% additional overall
efficiency improvement

21.5 A

23 mA

90%

-11%

92%

Overall motor efficiency

Stator operating current
@2500 rpm, 1.59 N-m

19 A

Silicon Steel

PROPULSION

Hiperco 50A

13% total improvement

+2%

Additional
~8 minute
flight

Silicon Steel

60 minute
flight time

Hiperco 50A

Figure 6. Overall efficiency improvement of the propulsion system from motor efficiency improvement and lower stator current requirement.

8

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Aerospace & Defense Technology - May 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - May 2021

Aerospace & Defense Technology - May 2021 - Intro
Aerospace & Defense Technology - May 2021 - Sponsor
Aerospace & Defense Technology - May 2021 - Cov1
Aerospace & Defense Technology - May 2021 - Cov2
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Aerospace & Defense Technology - May 2021 - Cov3
Aerospace & Defense Technology - May 2021 - Cov4
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