Importance of punching and workability in non-oriented electrical steel sheets

Kurosaki, Yousuke; Mogi, H.; Fujii, Hiroyasu; Kubota, Takeshi; Shiozaki, M.

doi:10.1016/j.jmmm.2008.04.073

Cited by 143 publications

(81 citation statements)

References 13 publications

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“…Their machining influences magnetic properties. The amount of material used for construction is changing in dependence on requested parameters of a machine and on final properties of the component made from the sheets [1]. The producers of the sheets usually measure magnetic parameters using the Epstein frame and the sheets are cut by guillotine.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing

et al. 2017

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Non-oriented electrical steel sheets are the most often used materials in electrical rotary machines. Raw sheets must be formatted by various methods, e.g., punching, laser, spark or water stream cutting. Basic parameters of magnetic, electrical, and mechanical properties of the sheets are usually obtained from the producer, but namely magnetic properties are changed in dependence on additional machining processes. The aim of this study is to describe changes in magnetic properties after punching, laser or spark cutting of the original sheets M470-50A. The basic information about the structure of the cut edges of samples was obtained by optical microscopy and scanning electron microscopy. For the magnetic measurements toroidal samples were prepared by the mentioned technologies. The magnetic parameters were yielded from the measuring of magnetic hysteresis loops in dependence on saturation fields. The results are discussed from the point of view of applied cutting methods with the aim to obtain the best magnetic parameters and consequently determining the depth of the influenced material. After laser cutting, important decrease in remanence and increase in total losses were observed in comparison with the punched samples.

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Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing

et al. 2017

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“…At the beginning we were trying to compare the temperature in the arbitrary chosen points to adjust the power density distribution in the strip. It did not give the satisfactory results, that were already published the literature [1][2][3][4][5][6]. We were trying the different sets of points located in different places on the strip.…”

Section: Resultsmentioning

confidence: 99%

“…In consequence 1-D thermal model was used in simulations. 1-D thermal model (5) in Laplace transform domain includes convection cooling along the strip. Convection was modelled using heat transfer coefficient ht = h1 + h2 which was constant but different for both sides of the strip.…”

Section: Analytical 1d Thermal Models In Frequency Domainmentioning

confidence: 99%

“…The scientists also use methods that are partially invasive ones, e.g. the needle probe method [4] (measuring needles absorb a portion of the heat generated in the area) or microhardness measurement method [5] (introducing additional microstrains in the structure). The authors of this paper show that it is possible to use IR camera to record the local temperature rise in the punched area, and then by using the analytical or/and numerical thermal modeling can determine the density distribution of power loss in the zone near the cut edge of the ferromagnetic strip [6].…”

Section: Introductionmentioning

confidence: 99%

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Application of IR thermography for thermal inverse modelling to evaluate the local power loss in punched ferromagnetic strips

Strąkowska¹,

Gmyrek²,

Więcek³

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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The authors deal with the problem of determining the local properties of ferromagnetic material subjected to mechanical cutting. They use a IR camera to record local temperature rise in the punched region. Next, the temperature measured is used in the numerical models that allow estimation of the power loss density distribution. A simple inverse thermal model for a ferromagnetic strip with non-uniform power loss are presented. The correctness of the results obtained from the simple inverse model is verified using the 3D thermal finite element model (FEM) and compared with the measurement results.

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“…The magnetic properties of motor cores deteriorated due to the presence of residual stress that is introduced during the manufacturing process [1,2]. Therefore, it is necessary to reduce this stress by stress-relief annealing when producing electrical machines which require low loss and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stress-Relief Annealing on Magnetic Properties of Motor Cores Using Induced Current Heating Method

Yang

Yoshida

Enokizono

2015

Journal of the Japan Society of Applied Electromagnetics and Me

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This paper presents the effect of stress-relief annealing on magnetic properties using an induced current heating(ICH) method in order to reduce the residual stress in the motor cores. The magnetic properties of a motor core annealed using the ICH method were first compared with those of a core annealed using a conventional electric furnace. When the hold time in each method was the same, the magnetic properties using the ICH method were improved over those using the EF method. The effects of varying the annealing temperature and time for the ICH process were then investigated. It was found that the values of the maximum permeability increased and the hys-teresis loss decreased with increasing annealing temperature and time. The total time of the stress-relief annealing could be achieved in a short period of about one hour.

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Importance of punching and workability in non-oriented electrical steel sheets

Cited by 143 publications

References 13 publications

Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing

Magnetic Properties and Structure of Non-Oriented Electrical Steel Sheets after Different Shape Processing

Application of IR thermography for thermal inverse modelling to evaluate the local power loss in punched ferromagnetic strips

Influence of Stress-Relief Annealing on Magnetic Properties of Motor Cores Using Induced Current Heating Method

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