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Development and Testing of a Coreless Axial Flux Electric Motor

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One of the types of electrical machines with high specific characteristics and small dimensions is the AFPM motor. These properties determine the interest in this type of electric machines in aviation. The small axial length of the AFPM motors allows them to be directly integrated without the risk of increasing the size of the aircraft. This paper presents the development and the experimental study of an AFPM motor without a stator core and with natural air cooling. The theoretical method for estimating the parameters of the AFPM motor has been presented. The calculated parameters have been used for a more accurate FEM analysis. According to the FEA calculations, the design of the AFPM motor has been developed and experimental studies have been carried out. The presented results of the experimental studies have good convergence with FEA analysis carried out during the design of a AFPM motor.
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Axial Flux; Permanent Magnet; Coreless; Halbach Array; Brushless Machines; Finite Element Analysis; Experimental Studies

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Alexandrova, Y., Semken, R., Pyrhönen, J., Permanent Magnet Synchronous Generator Design Solution for Large Direct-Drive Wind Turbines, (2013) International Review of Electrical Engineering (IREE), 8 (6), pp. 1728-1737.

Wannakarn, P., Kinnares, V., Single-Phase Grid Connected Axial Flux Permanent Magnet Generator System with Harmonic Mitigation Functionality for Various Types of Nonlinear Loads, (2018) International Review of Electrical Engineering (IREE), 13 (2), pp. 157-164.

Bindu, R., Thale, S., Performance Analysis of Power Sharing Control Strategies for Battery/Ultracapacitor Hybrid Energy Storage Based Electric Vehicle, (2020) International Review of Electrical Engineering (IREE), 15 (5), pp. 382-393.

Aviation-Emrax. [Online, Accessed: 24-Jan-2020]. Available:

P2 Hybrids YASA Limited. [Online, Accessed: 24-Jan-2020].

Product Compact Motor. [Online, Accessed: 24-Jan-2020].

Jebri, S., Nouri, K., Control of a Permanent Magnet Synchronous Motors Based on the Nonlinear Dynamic Inversion Approach, (2018) International Review of Automatic Control (IREACO), 11 (3), pp. 124-132.

W. Geng and Z. Zhang, Analysis and Implementation of New Ironless Stator Axial-Flux Permanent Magnet Machine With Concentrated Nonoverlapping Windings, IEEE Trans. Energy Convers., vol. 33, no. 3, pp. 1274-1284, Sep. 2018.

K. P. Duffy, Optimizing power density and efficiency of a double-halbach array permanent-magnet ironless axial-flux motor, in 52nd AIAA/SAE/ASEE Joint Propulsion Conference, 2016, 2016.

Y. Zhang, N. Liu, S. Guo, J. Tong, and Q. Zhou, Analysis and Design of Ironless Axial Flux Permanent Magnet Synchronous Motor, in Proceedings - 2018 10th International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC 2018, 2018, vol. 2, pp. 170-173.

Dalla Vedova, M., Berri, P., Optimization Techniques for Prognostics of On-Board Electromechanical Servomechanisms Affected by Progressive Faults, (2019) International Review of Aerospace Engineering (IREASE), 12 (4), pp. 160-170.

Fioriti, M., Vercella, V., A Parametric Cost Model for Estimating Civil Aircraft Line and Base Maintenance, (2019) International Review of Aerospace Engineering (IREASE), 12 (6), pp. 250-260.

F. R. Ismagilov, V. E. Vavilov, and I. F. Sayakhov, High-Torque Motor for a Gearless Electromechanical Actuator, in 2019 26th International Workshop on Electric Drives: Improvement in Efficiency of Electric Drives, IWED 2019 - Proceedings, 2019.

Products. [Online, Accessed: 24-Jan-2020]. Available:

Z. Zhang, W. Geng, Y. Liu, and C. Wang, Feasibility of a New Ironless-stator Axial Flux Permanent Magnet Machine for Aircraft Electric Propulsion Application, China Electrotech. Soc. Trans. Electr. Mach. Syst., vol. 3, no. 1, pp. 30-39, Apr. 2019.

T. Tallerico, J. Chin, and Z. Cameron, Optimization of an Air Core Dual Halbach Array Axial Flux Rim Drive for Electric Aircraft, in Proceedings - AIAA Aviation Forum, 2018.

D. C. Deisenroth and M. Ohadi, Thermal management of high-power density electric motors for electrification of aviation and beyond, Energies, vol. 12, no. 19. MDPI AG, 20-Sep-2019.

Elkhaldi, Z., Adjlout, L., Imine, O., Sikula, O., Numerical Simulation of Isolated Main Rotor and Full Helicopter Configuration in Vertical Autorotative Descent, (2020) International Review of Mechanical Engineering (IREME), 14 (6), pp. 365-373.

Abid, H., Hussien, A., Investigation on Effecting Parameters of the Wind Disturbance on Stability of the Steering System, (2020) International Review of Mechanical Engineering (IREME), 14 (5), pp. 331-338.

G. Brando, A. Dannier, L. P. Di Noia, R. Rizzo, and S. I. Hamasaki, Design of a PMSM for the electric steering of the nose landing gear, in 2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2016, 2016, pp. 371-375.

M. Islam, I. Husain, and R. Mikail, Slotless lightweight motor for drone applications, in 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, 2017, vol. 2017-January, pp. 5041-5048.

Windyandari, A., Haryadi, G., Suharto, S., Abar, I., Numerical Estimation of Glass Fiber Reinforced Plastic Propeller Performance Using Rigid and Flexible Model, (2019) International Review of Mechanical Engineering (IREME), 13 (4), pp. 218-223.

F. R. Ismagilov, V. E. Vavilov, and I. F. Sayakhov, Analysis of performance of disc-type high-speed generators design with PMs, in Proceedings - 2018 International Conference on Industrial Engineering, Applications and Manufacturing, ICIEAM 2018, 2018.

J. F. Gieras, R.-J. Wang, and M. J. Kamper, Axial Flux Permanent Magnet Brushless Machines. Dordrecht: Springer Netherlands, 2008.

Ismagilov, F., Vavilov, V., Sayakhov, I., Unipolar Magnetic Bearing for High-Speed Electric Motor of Aircraft Air Conditioning System: Structure and Optimization, (2018) International Review of Aerospace Engineering (IREASE), 11 (2), pp. 84-95.


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