Acoustic Noise Computation of Electrical Motors Using the Boundary Element Method

Sabin Sathyan, Ugur Aydin and Anouar Belahcen
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Sabin Sathyan: Department of Electrical Engineering and Automation, Aalto University, PO Box, 15500 Helsinki, Finland
Ugur Aydin: Department of Electrical Engineering and Automation, Aalto University, PO Box, 15500 Helsinki, Finland
Anouar Belahcen: Department of Electrical Engineering and Automation, Aalto University, PO Box, 15500 Helsinki, Finland

Energies, 2020, vol. 13, issue 1, 1-13

Abstract: This paper presents a numerical method and computational results for acoustic noise of electromagnetic origin generated by an induction motor. The computation of noise incorporates three levels of numerical calculation steps, combining both the finite element method and boundary element method. The role of magnetic forces in the production of acoustic noise is established in the paper by showing the magneto-mechanical and vibro-acoustic pathway of energy. The conversion of electrical energy into acoustic energy in an electrical motor through electromagnetic, mechanical, or acoustic platforms is illustrated through numerical computations of magnetic forces, mechanical deformation, and acoustic noise. The magnetic forces were computed through 2D electromagnetic finite element simulation, and the deformation of the stator due to these forces was calculated using 3D structural finite element simulation. Finally, boundary element-based computation was employed to calculate the sound pressure and sound power level in decibels. The use of the boundary element method instead of the finite element method in acoustic computation reduces the computational cost because, unlike finite element analysis, the boundary element approach does not require heavy meshing to model the air surrounding the motor.

Keywords: acoustics; boundary element method; electric machines; finite element method; induction motors; magneto-mechanics; modeling; noise; vibro-acoustics (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: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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