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1

Consideration of the spatial orientation of magnetic field quantities and tensile mechanical stress in the Finite Element Analysis of electrical machines

Schauerte Benedict, Xiao Xiao, Jansen Kevin, Hameyer Kay

Archives of Electrical Engineering

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2022

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Vol. 71, nr 4

949--961

EN

Due to speed-dependent centrifugal forces, the support of the torque, static mechanical stress introduced by manufacturing processes the laminated core of rotating electrical machines is exposed to considerable mechanical stress. The resulting stress distribution changes the magnetic properties of the electrical steel. To take this into account, a magnetization model is constituted on the basis of vector magneto-mechanical measurements that include the magnetic permeability as a function of the mechanical stress and the angle between magnetization - and the maximum principal stress direction. Subsequently, the model is integrated into the finite element simulation of a permanent magnet excited synchronous machine at different rotational speeds.

2

Numerical investigation of a coupling problem in magnetorheological elastometr FEM simulations

Niezgoda T., Szymczyk W., Boczkowska A.

Journal of KONES

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2008

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Vol. 15, No. 4

393-398

EN

Magnetorheological elastomers contain carbonyl iron particles of diameter of several microns, each that are dispersed in the polymer resin. These particles are grouped in structures like chains. Properties of such materials can be changed by applying an external magnetic field and they can vary in a wide range. When the magnetic field intensity rises, the effective elastic module increases. The resulting modulus increase is rapid, continuous, and reversible. For a relatively high-modulus elastomer matrix such as natural rubber, the fractional modulus increase with magnetic field can exceed 50%, while it can be even larger for low-modulus host materials. Thanks to this property MREs are used in constructions like controlled vibration dampers, absorbers (TVAs), clutches, actuators, stiffness tunable mounts and suspensions, variable impedance surfaces, automotive suspension bushings, valves, brakes, safety restraint systems, semi active control systems, building vibration isolation, etc. The magneto rheological elastomers (MRE) based on carbonyl iron particles-filled polyurethane resin were investigated. Their stiffness can be changed easily by magnetic field. Such a property can be useful in construction of active vibration damping structural elements. The problem of magneto-mechanical coupling was investigated. The coupling was performed in the 2 different ways. Both of the methods were iterative. The first one was performed in the two loops: external loop was performed over forces that loaded internal rows of iron particles (dipoles) and internal where the remaining external rows of dipoles were loaded by displacement that were induced by the forces. The second method used single loop performed over magnetic forces that were applied to external rows of dipoles and were recalculated in subsequent iterations accordingly to the change of distances between rows of dipoles. Iterations were performed until the state of balance was reached. The compliance of results confirms the correctness of applied numerical methods of MRE behaviour under applied magnetic field.

3

Magneto-elastic multiscale approach for the modelling of multiaxial stress state and plasticity - experimental and numerical aspects

Hubert O., Daniel L., Billardon R.

Przegląd Elektrotechniczny

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2005

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R. 81, nr 5

82-86

EN

This paper describes a multiscale model able to predict the influence of multiaxial stress state and plasticity on the magneto-mechanical behaviour of ferromagnetic polycrystals. This multiscale model is based on localisation and homogenisation procedures, and on a magnetoelastic model for single crystal.

PL

Opisano model o wielu skalach pozwalajqcy na przewidywanie wpływu wieloosiowych naprężeń na właściwości magneto-mechaniczne materiałów ferromagnetycznych polikrystalicznych. Model ten wykorzystuje procedury ujednorodniania oraz magnetoelastyczny model kryształu.

4

A new measurement device for two-dimensional vector-magnetic property in high magnetic flux density ranges

Sugimoto S., Urata S., Ikariga A., Shimoji H., Todaka T., Enokizono M.

Przegląd Elektrotechniczny

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2005

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R. 81, nr 5

27-30

EN

It is very difficult to measure the two-dimensional magnetic properties in a high flux density range, because we have to control the magnetic flux density to be a sinusoidal waveform. This paper presents results obtained in the designing of a new measurement device, which can be applied to a high flux density condition.

PL

Przedstawiono nowe stanowisko badawcze do określania właściwości magnetomechanicznych materiałów poddanych dwuosiowym obciążeniom. Układ wykorzystuje nowe techniki pomiaru. Jako układ odniesienia użyto układu do badania obciążeń jednoosiowych.

5

A new experimental set-up for the characterisation of magneto-mechanical behaviour of materials submitted to biaxial stresses. Application to FeCo alloys

Hubert O., Chaabane M., Jumel J., Maurel V., Alves F., Bensalah A.D., Besbes M., Azoum K., Daniel L., Bouillault F.

Przegląd Elektrotechniczny

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2005

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R. 81, nr 5

19-23

EN

This paper is dealing with a new experimental set-up built to get magneto-mechanical behaviour of ferromagnetic materials under biaxial stress state. This set-up is using the more recent techniques of measurement. An uniaxial set-up is nevertheless required to get reference magneto-mechanical measurements. First results concerning the magneto-mechanical behaviour of an iron-cobalt alloy submitted to uniaxial stress are presented.

PL

Przedstawiono nowe stanowisko badawcze do określania właściwości magnetomechanicznych materiałów poddanych dwuosiowym obciążeniom. Układ wykorzystuje nowe techniki pomiaru. Jako układ odniesienia użyto układu do badania obciążeń jednoosiowych. Przedstawiono wyniki badań właściwości stopów FeCo.