Modulation Effect of Slotted Structure on Vibration Response in Electrical Machines

Fang, Haiyang; Li, Dawei; Qu, Ronghai; Yan, Peng

doi:10.1109/tie.2018.2847639

Cited by 98 publications

(31 citation statements)

References 24 publications

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“…1. Magnetic surface force equivalent spectrum from air-gap to yoke Moreover, recent publications [4,5] are looking for an equivalent magnetic surface force applied on the stator yoke neutral fiber as illustrated in Fig. 1.…”

Section: Tooth Modulation Effect (Mod)mentioning

confidence: 99%

Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Pile

Menach

Besnerais³

et al. 2020

IEEE Trans. Magn.

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The Maxwell Tensor (MT) method is widely used to compute global forces or local surface forces for vibroacoustic design of electrical machines under electromagnetic excitation. In particular the air-gap Maxwell Tensor method is based on a cylindrical shell in the middle of the air-gap. This paper proposes to quantify the differences between the air-gap MT and the magnetic force wave experienced by the stator. In particular the air-gap to stator transfer and the tooth mechanical modulation effects are studied. A new formula is proposed to extend the tooth modulation effect to tangential forces. A numerical application is performed with a turbo-alternator to illustrate the respective and combined effects of both phenomena. The paper highlights that the tooth mechanical modulation is relevant even for electrical machines with a high number of teeth. Additionally the combination of the two phenomena has a clear impact on the calculated surface force. Therefore, it is recommended to take into account the air-gap transfer for any study of the tooth mechanical modulation effect.

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Section: Tooth Modulation Effect (Mod)mentioning

confidence: 99%

Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Pile

Menach

Besnerais³

et al. 2020

IEEE Trans. Magn.

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“…The topology used for this application is similar to that in ref. [31], except that the pole pair number was fixed to be eight and the simulation was performed at no-load as shown in Figure 15. In these conditions, Figures 14 and 16 give an image of the magnetic AGSF.…”

Section: Application With Spmsmmentioning

confidence: 99%

“…The AGSF is used to calculate equivalent distributed forces at the neutral fiber of the stator yoke [21] or on the tip of the stator teeth [29]. Several models have recently been proposed to compute from the AGSF the equivalent forces which applies to the neutral fiber [30,31]. In some cases, the AGSF is integrated as lumped tooth forces [14,32].…”

Section: Introductionmentioning

confidence: 99%

Analytical study of air-gap surface force – application to electrical machines

Pile

Besnerais²,

Parent

et al. 2020

Open Physics

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The Maxwell stress tensor (MST) method is commonly used to accurately compute the global efforts, such as electromagnetic torque ripple and unbalanced electromagnetic forces in electrical machines. The MST has been extended to the estimation of local magnetic surface force for the vibroacoustic design of electrical machines under electromagnetic excitation. In particular, one common air-gap surface force (AGSF) method based on MST is to compute magnetic surface forces on a cylindrical shell in the air gap. However, the AGSF distribution depends on the radius of the cylindrical shell. The main contribution of this study is to demonstrate an analytic transfer law of the AGSF between the air gap and the stator bore radius. It allows us to quantify the error between the magnetic surface force calculated in the middle of the air gap and the magnetic force computed on the stator teeth. This study shows the strong influence of the transfer law on the computed tangential surface force distribution through numerical applications with induction and synchronous electrical machines. Finally, the surface force density at stator bore radius is more accurately estimated when applying the new transfer law on the AGSF.

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“…In case of under-sampling, force harmonics with high spatial orders may excite lower structural modes due to aliasing effect. This phenomenon exists in topologies where the number of teeth is close to the number of poles [17]; 3) the computation of magnetic forces applied to a slotted structure, regarding the method formulation which depends on the electromagnetic model (mainly Virtual Work Principle for FEM [18] versus Maxwell Stress Tensor for (semi-) analytical models [1], [10]) and also on the modeling assumption (either local (or nodal) forces applied everywhere on the surface or lumped forces (resultant) applied on each tooth) whose equivalence is still under discussion [19]. 4) the noise and vibrations reduction strategies including passive reduction (such as rotor and/or stator skewing [20], [21], rotor and/or stator notching [22], [23], magnetic wedges [7], flux barriers [24], etc.)…”

Section: Introductionmentioning

confidence: 99%

Experimental Benchmark for Magnetic Noise and Vibrations Analysis in Electrical Machines

Devillers

Hecquet

Cimetiere

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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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.

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Modulation Effect of Slotted Structure on Vibration Response in Electrical Machines

Cited by 98 publications

References 24 publications

Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Analytical study of air-gap surface force – application to electrical machines

Experimental Benchmark for Magnetic Noise and Vibrations Analysis in Electrical Machines

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