Magnetic Properties of Particular Shape Specimen of Nonoriented Electrical Steel Sheet Under Compressive Stress in Thickness Direction

Kawabe, M.; Nomiyama, Takuma; Shiozaki, Akira; Mimura, M.; Takahashi, Norio; Nakano, Masami

doi:10.1109/tmag.2012.2199965

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…In order to facilitate useful modelling of these multi-directional effects, equivalent stress models were proposed [ 20 , 21 ]. The effect of compressive stress in the thickness direction was investigated similarily in [ 22 , 23 , 24 ]. Few reports where found by the authors on the effects of plastic deformation after the mechanical load was released.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Silicon Steel after Plastic Deformation

et al. 2020

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The energy efficiency of electric machines can be improved by optimizing their manufacturing process. During the manufacturing of ferromagnetic cores, silicon steel sheets are cut and stacked. This process introduces large stresses near cutting edges. The steel near cutting edges is in a plastically deformed stress state without external mechanical load. The magnetic properties of the steel in this stress state are investigated using a custom magnetomechanical measurement setup, stress strain measurements, electrical resistance measurements, and transmission electron microscopic (TEM) measurements. Analysis of the core energy losses is done by means of the loss separation technique. The silicon steel used in this paper is non-grain oriented (NGO) steel grade M270-35A. Three differently cut sets of M270-35A are investigated, which differ in the direction they are cut with respect to the rolling direction. The effect of sample deformation was measured—both before and after mechanical load release—on the magnetization curve and total core energy losses. It is known that the magnetic properties dramatically degrade with increasing sample deformation under mechanical load. In this paper, it was found that when the mechanical load is released, the magnetic properties degrade even further. Loss separation analysis has shown that the hysteresis loss is the main contributor to the additional core losses due to sample deformation. Releasing the mechanical load increased the hysteresis loss up to 270% at 10.4% pre-release strain. At this level of strain, the relative magnetic permeability decreased up to 45% after mechanical load release. Manufacturing processes that introduce plastic deformation are detrimental to the local magnetic material properties.

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Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Silicon Steel after Plastic Deformation

et al. 2020

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“…As has been confirmed by experiment results, the compressive stress acts on the electrical steel sheet can deteriorate the magnetic properties and increase the iron loss [ 7 – 10 ]. Therefore the estimation of iron loss in deep-sea permanent magnet motors must take into account the seawater compressive stress.…”

Section: Introductionmentioning

confidence: 86%

“…The compressive stress in the stator core is always evaluated using the Von Mises stress. The Von Mises stress is given by the following equation:

The stress caused by shrink fitting is usually analyzed using the heat strain induced from the thermal difference during the fitting process [ 10 ]. In this paper, the thermal difference between the stator and the frame is set as 65°C according to the actual case.…”

Section: Stress Distribution In the Stator Core Considering Seawatmentioning

confidence: 99%

Estimation of the Iron Loss in Deep-Sea Permanent Magnet Motors considering Seawater Compressive Stress

Wei

Zou

et al. 2014

The Scientific World Journal

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Deep-sea permanent magnet motor equipped with fluid compensated pressure-tolerant system is compressed by the high pressure fluid both outside and inside. The induced stress distribution in stator core is significantly different from that in land type motor. Its effect on the magnetic properties of stator core is important for deep-sea motor designers but seldom reported. In this paper, the stress distribution in stator core, regarding the seawater compressive stress, is calculated by 2D finite element method (FEM). The effect of compressive stress on magnetic properties of electrical steel sheet, that is, permeability, BH curves, and BW curves, is also measured. Then, based on the measured magnetic properties and calculated stress distribution, the stator iron loss is estimated by stress-electromagnetics-coupling FEM. At last the estimation is verified by experiment. Both the calculated and measured results show that stator iron loss increases obviously with the seawater compressive stress.

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“…The Jiles-Atherton domain wall displacement model [17] is shown as formula (8), considering the stress field (8) where λ s is saturation magnetostrictive coefficient, M is the system magnetization, and M s is the system saturation magnetization.…”

Section: Cause and Changing Regularity Of Stress And Magnetic Propertymentioning

confidence: 99%

“…In order to analyze the stress-magnetic property of electrical steel, researchers started from the microstructure of electrical steel materials and researched on ferromagnetic property of electrical steel materials, and gave the basic theoretical basis of stress-magnetic property [5]. Laurent Daniel and other scholars conducted experiments on the magnetic properties of electrical steel under stress and concluded that compressive stress in the normal plane can change the magnetic properties of electrical steel; however, they did not study the magnetic properties under tensile stress [6][7][8]. Yamazaki K and others simulated a surface-mounted permanent-magnet motor on the basis of assembly stress, and verified this simulation method through experiments [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Core Stress on Performance of Permanent Magnet Synchronous Motor

Cao¹,

Huang²,

Shi³

2019

JMAG

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The motor core stress produced during the manufacturing process and motor operation changes the electromagnetic characteristics of the iron core. Thus, research on electromagnetic calculations under the condition of stress is one of the key challenges to achieve more efficient designs of permanent magnet motors. In this paper, the stress equations of a rotor centrifuge and stator interference assembly are studied, and the changing regularity of stress and magnetic properties of electrical steel and its causes are analyzed theoretically. A device for measuring the stress and magnetic properties of electrical steel is designed and tested. Then, a model for iron loss calculations that includes stress is proposed for improved design. The effects of stress on loss, d-q axis inductance, and torque are simulated and compared using an IPMSM as an example. The feasibility and accuracy of this method are verified by comparing the simulation and prototype test results.

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Magnetic Properties of Particular Shape Specimen of Nonoriented Electrical Steel Sheet Under Compressive Stress in Thickness Direction

Cited by 12 publications

References 9 publications

Magnetic Properties of Silicon Steel after Plastic Deformation

Magnetic Properties of Silicon Steel after Plastic Deformation

Estimation of the Iron Loss in Deep-Sea Permanent Magnet Motors considering Seawater Compressive Stress

Influence of Core Stress on Performance of Permanent Magnet Synchronous Motor

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