Unbalanced Magnetic Pull Calculation in Ironless Axial Flux Motors

Guoqing Zhu and Jian Luo ()
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Guoqing Zhu: School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China
Jian Luo: School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China

Energies, 2025, vol. 18, issue 9, 1-20

Abstract: Axial flux motors have gained widespread attention in the field of electric vehicles. The stator may exert a unilateral axial force on the dual rotors under uneven air gaps. The unbalanced magnetic pull can influence the production and processing of the motor, leading to issues such as vibrations, bearing degradation, reduced lifespan, and torque reduction attributed to the bearings. Accurate evaluation of the unilateral magnetic pull can reduce costs associated with bearing protection. For dual-rotor motors, the axial forces of the rotors act in opposite directions with nearly equal magnitudes, resulting in the catastrophic cancellation of unbalanced magnetic pull calculations. A similar phenomenon may occur between coils, introducing computational errors. To avoid these errors, the stator was selected as the computational target for unilateral axial force calculations. The integration domain was defined to encompass the entire air region containing all windings, rather than summing individual force components. This merged integration approach was mathematically validated through the Maxwell stress tensor method. Finally, the obtained stator axial force closely matched the rotor axial force in magnitude, demonstrating the accuracy of the proposed method.

Keywords: unbalanced magnetic pull; axial flux motor; Maxwell stress tensor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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