Material parameters for the structural dynamic simulation of electrical machines

Giet, M. van der; Kasper, Knut A.; Doncker, Rik W. De; Hameyer, Kay

doi:10.1109/icelmach.2012.6350314

Cited by 35 publications

(20 citation statements)

References 9 publications

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“…The isotropic modelling approach also limits the amount of novel modelling possibilities, it makes strong assumptions and the results accuracy is directly impacted. Experimental work [38] also shows that the Young's modulus in the stack direction is lower than in the other directions.…”

Section: Structural Dy Namicsmentioning

confidence: 89%

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Review of multidisciplinary homogenization techniques applied to electric machines

Chauvicourt

Romanazzi

Howey

et al. 2016

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)

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Cost reduction of any design process is always of interest for industries. Simulation work packages tackle this problem since they can quickly provide reliable results that permit detection of critical design issues prior to the prototype phase. A trade-off is then often made between model accuracy and computation speed. In the particular case of electric machines, homogenization techniques are used in order to keep high accuracy while running fast calculations. They are involved in multiple disciplines in which the machine performances are verified such as elec tromagnetic, mechanical, thermal and acoustic domains.This paper aims at defining whether these homogenization methods can be extended from one discipline to another by reviewing them independently of the physical domain.

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Section: Structural Dy Namicsmentioning

confidence: 89%

“…The basic idea is to take the volume ratio cPn of each of the component into account to calculate the weighted averages of each constitutive parameters. Details about this method and equations to retrieve the unknown parameters are avail able in the work of M. van der Griet [38] and Millithaler [40] [41].…”

Section: Structural Dy Namicsmentioning

confidence: 99%

Review of multidisciplinary homogenization techniques applied to electric machines

Chauvicourt

Romanazzi

Howey

et al. 2016

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)

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“…For example, it is known that the equivalent Young's modulus of the laminated electrical steel is much lower than that of the standard structural steel [5,6]. However, as was pointed out by van der Giet et al [8] and many others, both measurements and the modeling of Young's modulus of the laminated electrical steel are still difficult due to the lack of general principle to represent the elastic modulus of the laminated steel sheets. Therefore, if one needs to obtain accurate dynamic models, it is sometimes necessary to use homogenized model and rely on optimization algorithms to identify the equivalent elastic constants of such components, as was done by Mogenier et al [7] and van der Giet et al [8].…”

mentioning

confidence: 96%

“…However, as was pointed out by van der Giet et al [8] and many others, both measurements and the modeling of Young's modulus of the laminated electrical steel are still difficult due to the lack of general principle to represent the elastic modulus of the laminated steel sheets. Therefore, if one needs to obtain accurate dynamic models, it is sometimes necessary to use homogenized model and rely on optimization algorithms to identify the equivalent elastic constants of such components, as was done by Mogenier et al [7] and van der Giet et al [8]. Third, in the standpoint of multiphysics coupling between the magnetic field and the structural dynamics, the difficulty is the simultaneous treatment of both the magnetic field and the vibration problem.…”

mentioning

confidence: 97%

Efficient forced vibration reanalysis method for rotating electric machines

Saito

Suzuki

Kuroishi

et al. 2015

Journal of Sound and Vibration

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“…An efficient contact model in the field of multibody dynamics was presented in [9], which separates between the normal and tangential influences of contact parameters on a highly flexible body. Laminated structures are also commonly modelled using orthotropic material properties [10], [11] and [12] that are obtained experimentally, by measuring a real structure and consequently updating the numerical model. Simplified models are used in order to reduce the complexity, number of components in the analysis, number of details and number of degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Introduction of Welds into the Dynamic Model of Laminated Structures

2018

SV-JME

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• Experimental modal analysis was used to validate the model. INTRODUCTIONIn order to reduce Eddy currents and consequently heat losses, the magnetic cores in electrical devices are usually made of large number of thin metal sheets. These sheets are stacked together and are often line welded in order to preserve shape. The magnetostriction and magetic forces are a phenomena accompanying the magnetisation process and present a problem in terms of vibrations. The intensity of vibrations depends on the dynamic properties of the structure and the magnitude of the excitation phenomena. By optimizing the design of the laminated structure, the resonant frequencies can be avoided.In order to predict the dynamic response of such structures a valid structural model must be developed, including an effective and reliable model of a contact-dependent structure, with friction between the laminae.Laminated structures are usually substantially more flexible than the equivalent homogeneous structures [1] and [2], and exhibit orthotropic behavior and high levels of internal damping due to the interlaminar friction forces [3] and [4]. The numerical model of a laminated structure has to account for the pressure distribution between laminae, as it influences the stiffness distribution within the structure [4] to [6]. The authors of [6] observed a significant increase of the eigenfrequencies even for small increases of the pressure between the laminae. Some analytical models also exist for the estimation of modal parameters of a stator packet [7] and [8]; however, they fail to take the frictional contact between the laminae into account. An efficient contact model in the field of multibody dynamics was presented in [9], which separates between the normal and tangential influences of contact parameters on a highly flexible body. Laminated structures are also commonly modelled using orthotropic material properties [10], [11] and [12] that are obtained experimentally, by measuring a real structure and consequently updating the numerical model. Simplified models are used in order to reduce the complexity, number of components in the analysis, number of details and number of degrees of freedom. Many of these models were developed for the modelling of composite structures. These methods are commonly referred to as homogenisation methods [12].Some of the methods employ "template" -2018/2/19 -9:53 -page 2 -#2 Modelling of the structure using the orthotropic material properties is performed by modifying the shear and elastic moduli of the equivalent homogeneous structure.The obtained material parameters are applicable to the specific laminated structure and assume a uniform pressure distribution and friction forces between the lamina.Thus, each modification regarding the geometry, number of laminae, number and position of welds, etc. has to be evaluated experimentally and then the valid numerical model can be created. Moreover, the introduction of orthotropic material properties can also lead to the occurrence of additional unrealistic mod...

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Material parameters for the structural dynamic simulation of electrical machines

Cited by 35 publications

References 9 publications

Review of multidisciplinary homogenization techniques applied to electric machines

Review of multidisciplinary homogenization techniques applied to electric machines

Efficient forced vibration reanalysis method for rotating electric machines

Introduction of Welds into the Dynamic Model of Laminated Structures

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