Calculation methods for electromagnetically excited noise in induction motors

Nahlaoui, M. Al; Braunisch, D.; Eichinger, Benjamin; Kulig, Stefan; Ponick, Bernd; Werner, Ulrich

doi:10.1109/edpc.2011.6085561

Cited by 5 publications

(9 citation statements)

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“…These have been shown to considerably influence the vibration behavior; even the end shields alter the vibration response significantly [32]. Thus, there are very detailed models for the electromagnetic and structural subsystems, which are very useful for the design of low-noise motors [22], [23], [25]- [29], [33], [34].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach

Binojkumar

Saritha

Narayanan

2014

IEEE Trans. Ind. Electron.

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This paper presents an experimental procedure to determine the acoustic and vibration behavior of an inverter fed induction motor based on measurements of current spectrum, acoustic noise spectrum, overall noise in dB, and overall Aweighted noise in dBA. Measurements are carried out on spacevector modulated 8-hp and 3-hp induction motor drives over a range of carrier frequencies at different modulation frequencies.The experimental data helps to distinguish between regions of high and low acoustic noise levels. The measurements also bring out the impact of carrier frequency on the acoustic noise. The sensitivity of the overall noise to carrier frequency is indicative of the relative dominance of the high-frequency electromagnetic noise over mechanical and aerodynamic components of noise. Based on the measured current and acoustic noise spectra, the ratio of dynamic deflection on the stator surface to the product of fundamental and harmonic current amplitudes is obtained at each operating point. The variation of this ratio of deflection to current product with carrier frequency indicates the resonant frequency clearly and also gives a measure of the amplification of vibration at frequencies close to the resonant frequency. This ratio is useful to predict the magnitude of acoustic noise corresponding to significant time-harmonic currents flowing in the stator winding.

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Section: Introductionmentioning

confidence: 99%

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach

Binojkumar

Saritha

Narayanan

2014

IEEE Trans. Ind. Electron.

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“…This will be shown in the next chapter. The comparison of rated and no-load operation as well as consideration of inverter-fed has been presented in [6]. Further the calculation of the force waves using Maxwell's stress tensor and the transition to the mechanical model has been shown in [6], too.…”

Section: Electromagnetic Considerationsmentioning

confidence: 99%

“…2 0 2 μ σ rad rad B = (5) This shows that if the air gap field is described by the sum of many induction waves, the whole sum has to be squared to calculate the force waves. The force calculation can be determined from this as follows (6) This equation shows that also induction waves with small amplitudes can lead to significant force waves, if they are multiplied by an induction wave with large amplitude. To avoid errors caused by limiting the induction waves to a minimum peak height, the whole transient 3D curve is squared and Fourier transformed.…”

Section: Mechanical Considerationsmentioning

confidence: 99%

“…This results in 144 interpolation points to build up each wave. For example, to impress a 100 Hz, r = 4 force wave, every line is allocated the same amplitude, but the phase is distributed by , x r ⋅ = ϕ (7) where x is the position on the circumference. Figure 5 shows the distribution for the wave mentioned above.…”

Section: Mechanical Considerationsmentioning

confidence: 99%

“…In [5,8] for example basic considerations and efforts to deduce the noise emission have been performed. The air-gap field has also been investigated in [1,4,7]. However, the increasing use of inverters has drastically increased the relevance of these investigations.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation

Nahlaoui¹,

Steins²,

Kulig³

et al. 2013

Archives of Electrical Engineering

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Abstract:In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.

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Correlating structural complexity and acoustic noise performance of electric motors

Ibrahim

Mohammadi

Ghorbanian

et al. 2022

COMPEL

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Purpose Acoustic noise is a crucial performance index in the design of electrical machines. Due to the challenges associated with modelling a complete motor, the stator is often used to estimate the sound power in the prototyping stage. While this approach greatly reduces lengthy simulations, the actual sound power of the motor may not be known. But, from the acoustic noise standpoint, not much is known about the correlation between the stator and complete motor. This paper, therefore, aims to use the sound pressure levels of the stator and the full motor to investigate the existence of correlations in the interior permanent magnet synchronous motor. Design/methodology/approach A multiphysics simulation framework is proposed to evaluate the sound pressure levels of multiple motor geometries in a given design space. Then, a statistical analysis is performed on the calculated sound pressure levels of each geometry over a selected speed range to compare the correlation strength between the stator and the full model. Findings It was established that the stator and the complete motor model are moderately correlated. As such, a reliance on the stator sound power for design and optimization routines could yield inaccurate results. Originality/value The main contribution involves the use of statistical tools to study the relationship between sound pressure levels associated with the stator geometry and the complete electric motor by increasing the motor sample size to capture subtle acoustic correlation trends in the design space of the interior permanent magnet synchronous motor.

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Calculation methods for electromagnetically excited noise in induction motors

Cited by 5 publications

References 0 publications

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach

Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation

Correlating structural complexity and acoustic noise performance of electric motors

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Calculation methods for electromagnetically excited noise in induction motors

Cited by 5 publications

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Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives &#x2013; An Experimental Approach

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives &#x2013; An Experimental Approach

Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation

Correlating structural complexity and acoustic noise performance of electric motors

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Product

Resources

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Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach

Acoustic Noise Characterization of Space Vector Modulated Induction Motor Drives – An Experimental Approach