Reducing Cogging Torque in V-Shaped BLDC Motors: A FEA Simulation Study on the Impact of Skew Angle

Dewi Rianti Mandasari, Budi Sudiarto, Lia Amelia, Asep Andi Suryandi

Abstract

This study explores the influence of stator skew angles on the cogging torque in V-shaped Brushless Direct Current (BLDC) motors, focusing on applications in electric vehicles.  By applying Finite Element Analysis (FEA), this research investigates the impact of stator core skewness on torque performance, with a particular focus on the reduction of cogging torque. Cogging torque, which causes torque fluctuations during rotor movement, affects motor smoothness and noise. The study sought an ideal skew angle to reduce cogging torque without affecting torque production. The FEA calculations using ANSYS Maxwell showed that adding skew angles to the stator core can reduce cogging torque and improve motor efficiency and user experience. Operational torque curves, cogging torque, and torque harmonics revealed the motor's performance under different skew angles. At a 0˚ skew angle, the motor produced 4.888 Nm of cogging torque. Adjusting the skew angle to 5˚ significantly reduced cogging torque to 3.251 Nm. By increasing the skew angle to 10˚, the cogging torque was reduced by 72% to 1.353 Nm. A 15˚ skew angle resulted in nearly zero cogging torque, proving the effectiveness of this design modification. Research shows that a 15˚ skew angle significantly reduces cogging torque and improves torque smoothness, resulting in almost zero torque and significant harmonic amplitude reduction.

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DOI: https://doi.org/10.20961/mekanika.v23i1.83242

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