# Analysis and Assessment of a Brushless DC Outrunner Motor for Agriculture Drones Using JMAG
## 5 Conclusions  
This paper proposed a propulsion system design methodology for UAV agriculture applications focused on BLCD motor analysis. A numerical approach was used to evaluate a commercial propeller and motor under the specified range. Once the design requirements of this application were explored, the assessment strategy began with the propeller sizing and aerodynamic analysis using the finite volume method, where thrust-speed, torque-speed, and efficiency-speed curves were obtained with 6.32% thrust and 10.1% torque maximum deviation from experimental results. Additionally, an electromagnetic study using JMAG was used to evaluate the fit of a BLDC motor with the design requirements. Appropriate driving signal generation permits accurate motor performance evaluation; for this, a trapezoidal commutation circuit was implemented. Together with the right energy source, the selection of an efficient motor-propeller combination that complies with the desired flying time was obtained. The findings demonstrate that numerical methods provide valuable insights in large-sized UAV design, decreasing the experimental tests conducted and accelerating implementation time. Further research should focus on the thermal effects of the power electronics and electric motors in drone performance, allowing for more accurate electric machine evaluation. Similarly, turbulence models with a higher number of transport equations can be implemented with transient simulations to improve numerical results in the aerodynamic analysis of drone propellers. Regarding the drone structure, structural analysis will provide valuable insights in material assessment and optimization.  
Conceptualization, J.d.l.C.S., J.J.G.-A. and J.Y.R.-M.; data curation, G.O.-T., S.E.G.-C., H.M.B.-A., M.R.-M. and M.A.L.-O.; formal analysis, J.J.G.-A., J.Y.R.[PERSON], [PERSON] and [PERSON]; investigation, [PERSON]-[PERSON], [PERSON], [PERSON] and [PERSON]-O.; methodology, [PERSON], [PERSON]-[PERSON], [PERSON]-[PERSON], [PERSON] and O.A.V.-L.; software, [PERSON]-C. and [PERSON]-M.; validation, [PERSON]-T.; writing--original draft, [PERSON]-A.; writing--review and editing, [PERSON], [PERSON]-T., [PERSON], [PERSON], [PERSON] and [PERSON]-O. All authors have read and agreed to the published version of the manuscript.  
The authors would also like to express their gratitude to the Jalisco State Council of Science and Technology (COECyTJAL) for the Call for Proposals of the Jalisco Scientific Development Fund to Address Social Challenges 2022 (FODECIJAL 2022), with grant number 10105-2022, for their financial support, which made this work possible.  
The original contributions presented in the study are included in the article; further inquiries can be directed to the corresponding author.  
The authors would like to thank the Motion Capture Laboratory at the University of Guadalajara, Los Valles University Center, for granting access to their equipment and facilities. Additionally, the authors would also like to thank the Consejo Nacional de Humanidades, Ciencias y Tecnologias (CONAHCYT) for the scholarship awarded to carry out my master studies in physics, mathematics, and sciences with mathematics orientation..  
\begin{table}
\begin{tabular}{l l l l l} \hline \hline
**Parameter** & **Proposed Drone** & **Agras T10** & **Agras T20** & **Coaxial Drone**[26] \\ \hline Take-off weight & 30 kg & 24.8 kg & 32 kg & 20 kg \\ Motor KV & 120 rpm/V & 84 rpm/V & 48 rpm/V & 330 rpm/V \\ Max motor power & 4560 W & 2500 W & 4000 W & 1425 W \\ Flight time in hover & 11.6 min & 9 min & 14.5 min & 9.88 min \\ \hline \hline \end{tabular}
\end{table}
Table 15: Comparative analysis of large-sized multi-rotors.