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Published on: October 28, 2022
Underwater 2D acoustic sensitivity analysis of permanent magnet synchronous motors
Xiaopeng Li1, Guang Lei2, Bin Wang3
1Henan International Joint Laboratory of Structural Mechanics and Computational Simulation, College of Architecture and Civil Engineering, Huanghuai University, Zhumadian, PR China.
Abstract:
This paper employs the Boundary Element Method (BEM) to analyze underwater electromagnetic (EM) noise generated by permanent magnet synchronous motors (PMSMs) under high-frequency vibrations and conducts acoustic shape sensitivity analysis for motors with different radii. Traditional BEM faces two main challenges when applied to EM noise problems in rim-driven thrusters: the tendency to produce fictitious modes at high frequencies, and the dense and frequency-dependent nature of BEM matrices, which leads to low efficiency in wideband frequency sweep calculations. To address these issues, the Burton-Miller formulation is introduced to suppress fictitious modes, and a Taylor expansion method is adopted for efficient frequency sweep computations. In addition, a wideband acoustic shape sensitivity analysis method based on the direct differentiation approach is used for optimal design of the motor geometry. Finally, numerical experiments on a 96-slots, 16-poles PMSM validate the accuracy and efficiency of the proposed method.
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