The influence of punching process on residual stress and magnetic domain structure of non-oriented silicon steel

Cao, Huatang; Hao, Linpo; Yi, Jing-Wen; Zhang, Xianglin; Luo, Zhonghan; Chen, Shenglin; Li, Rongfeng

doi:10.1016/j.jmmm.2015.12.098

Cited by 39 publications

(21 citation statements)

References 25 publications

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“…The degradation of magnetic properties can be attributed to the introduction of stress. The residual stress present in the material after cutting was measured locally near the cutting edge in [ 5 ], and near welding seams in [ 6 ]. In both cases, it was observed that the residual stress changed drastically near the locally impacted area.…”

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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“…It is well known that the cutting process causes a drop in the relative permeability of electric steels accompanied by an increase in core losses [8]. There have also been extensive research works on the effects of cutting on the microscopic material characteristics of electric steels [9][10][11][12]. However, less attention has been paid towards modelling these effects.…”

Section: Literature Reviewmentioning

confidence: 99%

Modelling and analysis of the effects of cutting of core laminations in electric machines

Alatawneh

Saleem

Rahman

et al. 2020

IET Electric Power Applications

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Experimental measurements of electrical machine performances reveal a significant difference between simulations and measurements. It is known that the manufacturing processes of machines, particularly, the cutting of core laminations adversely affects material properties. The current techniques for considering the effects of cutting lack accuracy, computation efficiency and applicability for finite element (FE) software. This study proposes a method to model the variation in the magnetic properties of electrical steel due to cutting based on a non‐equal multi‐slice technique. In this work, the method has been validated and implemented on a FE permanent magnet synchronous motor model. Also, the proposed method has been compared with the single‐layer method.

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“…Subramonian et al [23] developed a method to select a geometry dependent variable punch-die clearance to achieve more uniform wear on the punch, thereby enhancing the punch and die life by minimizing tool wear. Cao et al [24] measured the residual stress after the punching process. The residual stress affected the zone of punching by about 0.4-0.5 mm in width.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Cutting Clearance, Deformation Texture, and Magnetic Loss Prediction in Non-Oriented Electrical Steels

et al. 2021

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Manufacturing the magnetic cores in electrical machines impacts the magnetic performance of the electrical steel by inducing stresses near the cutting edge. In this paper, energy loss behaviour in non-oriented electrical steels punched with different cutting clearances before and after annealing is investigated. An experimental shear cutting tool was employed to punch the ring-shaped parts from electrical steels in a finished state with four different values of cutting clearance corresponding to 1%, 3%, 5%, and 7% of the sheet thickness. The effect of cutting clearance on the magnetic losses is derived and analysed by the statistical theory of losses and associated loss separation concept including the analysis of movable magnetic objects. In this framework, this paper assesses the combined effect of cutting clearance, frequency, and heat treatment on the hysteresis loops and iron losses in non-oriented FeSi electrical steels. Measurements have been performed from quasi-static to 400 Hz at peak induction Bp = 1.0 T. Both states before and after heat treatment have been considered. The excess loss is observed as the most sensitive loss component to cutting clearance and its magneto–structural correlation is quantified.

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The influence of punching process on residual stress and magnetic domain structure of non-oriented silicon steel

Cited by 39 publications

References 25 publications

Magnetic Properties of Silicon Steel after Plastic Deformation

Magnetic Properties of Silicon Steel after Plastic Deformation

Modelling and analysis of the effects of cutting of core laminations in electric machines

Correlation between Cutting Clearance, Deformation Texture, and Magnetic Loss Prediction in Non-Oriented Electrical Steels

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