Aerospace & Defense Technology - May 2021 - 9

UAV Propulsion Systems

16% higher than the silicon steel core model, resulting from
the increase in peak power because of the higher magnetic
induction.
The power-dense motor with the Hiperco 50A core is also
more efficient than the silicon steel core motor. A 2% increase in overall power efficiency and a stator phase current
11% lower was measured utilizing Hiperco 50A cores compared to silicon steel. The torque of a motor is a product of
the magnetic flux injected into the circuit. Motors with more
magnetic force require less current to produce the same or increased torque. Thus, motors operating at lower currents can
benefit from proportional power saving to the battery while
the drone is operational, making high thrust, low current
drawing motors ideal for drone applications. The overall efficiency of the propulsion system increases by 13%, translating to an increased flight time by eight minutes (for the simulated 60 min flight time).

Conclusion
The modeling analysis found that the Hiperco 50A corebased motor performed substantially better than the silicon steel core stator-core motor, providing the following
benefits:
I. 16% increase in power density
Power-dense motors make drones more functional, providing the designer the flexibility to tailor options to add
more value through items such as more sensors or improved cameras to meet users' functionality requirements.
II. 16% improvement in peak torque
Increasing the peak torque of UAVs enables them to be
more agile in operation with faster responses.
III. 36% increase in continuous power
Higher continuous power provides drones with more mobility and reliability. The acceleration and speed of
drones will continue to increase because of optimization
gains in peak and continuous torque.
IV. 8-min increased flight time (on a 60-min flight
drone)
Overall efficiency of propulsion systems increases as motors operating at lower currents save battery power, allowing for more flight time.
The spectrum of performance improvement benefits realized through the drop-in replacement of silicon steel
with a Hiperco 50A stator translates perfectly to the
warfighter's needs in drone applications. Hiperco 50A
equipped drones provide an advantage in speed, range,
agility, endurance, and mission payload. Hiperco 50A stators deliver targeted benefits spelled out by the Army's Future Vertical Lift (FVL) plan. Combat Commanders can
translate these capabilities into advantages at the tactical,
operational, and strategic level that provide the margin for
victory on the battlefield.
This article was written by Md Mehedi, Ph.D., Sr. Application
Development Engineer, Carpenter Technology (Philadelphia, PA).
For more information, visit http://info.hotims.com/79413-501.
Free Info at http://info.hotims.com/79413-757

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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
Aerospace & Defense Technology - May 2021 - 1
Aerospace & Defense Technology - May 2021 - 2
Aerospace & Defense Technology - May 2021 - 3
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Aerospace & Defense Technology - May 2021 - Cov3
Aerospace & Defense Technology - May 2021 - Cov4
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