Experimental Benchmark for Magnetic Noise and Vibrations Analysis in Electrical Machines

Abstract

This article presents an experimental setup dedicated to the analysis of magnetic noise and vibrations in radial flux electrical machines. Both electromagnetic excitation and structural response of the electrical machine are simplified to provide the first benchmark of the phenomenon of electromagnetically-excited noise and vibrations. The test bench properties as well as the magnetic, vibration and acoustic upcoming extensive measurements are shared to the scientific community, providing a clear reference case to compare different modeling and simulation approaches.

Acoustic Noise Computation of Electrical Motors Using the Boundary Element Method

“…One major drawback concerning numerical computations of acoustic noise is the relatively higher memory requirements and computational time required compared to analytical and semi-analytical models. The increased computational time of the FEM has been mentioned as a drawback of numerical methods in the literature, such as in References [7][8][9]. The use of the BEM in an acoustics domain fixes this issue to a considerable degree, without compromising the accuracy of the results.…”

“…Devillers et al studied the effect of tangential magnetic forces on vibrations and acoustic noise using a fast subdomain method to calculate Maxwell stress distribution and an electromagnetic vibration synthesis technique [8]. The same team later developed an experimental benchmark set-up for magnetic noise and a vibration analysis of electrical machines [9]. Fakam et al coupled finite element structural analysis with an analytical tool to compute and compare the electromagnetic noise between surface permanent magnet and interior permanent magnet rotor topologies of a synchronous machine [10].…”

Effect of Mesh-to-Mesh Projection on the Magnetic Tooth Forces Calculation in Electrical Machines

“…The studied topology is the same as in [3]. The magnetic field is solved using 2D non-linear magneto-static Finite Element Analysis (FEA) with MANATEE-FEMM coupling [10].…”

“…3. This frequency is used to test the proposed approach of mesh-to-mesh projection as it is known to be responsible for vibro-acoustic issues [3]. Moreover, the highest wave number r = 10 at 2f s is the one most likely to introduce errors with sharp variations of the force density between nodes.…”

“…Thus, only magnetic surface force are considered in this work. The machine is an open-access testbench and all information can be obtained from [3]. This paper is a first step in order to propose a workflow based on the VWP to troubleshoot eNVH issues.…”