Aspects of the cut-edge effect stress on the power loss and flux density distribution in electrical steel sheets

Moses, Anthony John; Derebasi, Naim; Loisos, G.; Schoppa, A.

doi:10.1016/s0304-8853(00)00260-2

Cited by 95 publications

(38 citation statements)

References 3 publications

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“…The flexibility of the iron-loss model allows for consideration of parasitic loss mechanisms additionally contributing to the total losses, such as the manufacturing process [26][27][28][29][30]. Since at prototyping stage of electrical machines mostly other manufacturing processes are used than in mass series production, the influence from manufacturing can be taken into account and a prediction of the behaviour of a series produced machine can be derived.…”

Section: Discussionmentioning

confidence: 99%

Operating point resolved loss computation in electrical machines

Pfingsten¹,

Ruf²,

Steentjes³

et al. 2016

Archives of Electrical Engineering

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Magnetic circuits of electromagnetic energy converters, such as electrical machines, are nowadays highly utilized. This proposition is intrinsic for the magnetic as well as the electric circuit and depicts that significant enhancements of electrical machines are difficult to achieve in the absence of a detailed understanding of underlying effects. In order to improve the properties of electrical machines the accurate determination of the locally distributed iron losses based on idealized model assumptions solely is not sufficient. Other loss generating effects have to be considered and the possibility being able to distinguish between the causes of particular loss components is indispensable. Parasitic loss mechanisms additionally contributing to the total losses originating from field harmonics, non-linear material behaviour, rotational magnetizations, and detrimental effects caused by the manufacturing process or temperature, are not explicitly considered in the common iron-loss models, probably even not specifically contained in commonly used calibration factors. This paper presents a methodology being able to distinguish between different loss mechanisms and enables to individually consider particular loss mechanisms in the model of the electric machine. A sensitivity analysis of the model parameters can be performed to obtain information about which decisive loss origin for which working point has to be manipulated by the electromagnetic design or the control of the machine.

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Section: Discussionmentioning

confidence: 99%

Operating point resolved loss computation in electrical machines

Pfingsten¹,

Ruf²,

Steentjes³

et al. 2016

Archives of Electrical Engineering

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“…The search coil method and needle probe method were used to investigate the magnetic properties near the sheared edge. [12][13][14] However, these methods could not clarify the mechanism of the degradation. Based on these previous considerations, we chose the strain measurement using synchrotron radiation, which enables non-destructive strain measurement near the sheared edge.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of stress distribution due to shearing in non-oriented electrical steel by using synchrotron radiation

Zaizen¹,

Omura²,

Fukumura³

et al. 2016

AIP Advances

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The influence of the shearing process on the iron loss of non-oriented electrical steels with grain sizes of 10 μm-150 μm was investigated. The deterioration ratio of iron loss was clearly smaller in sample with small grain sizes. The droop height, reflecting the amount of plastic deformation, displayed a good relationship with the deterioration of iron loss under the effect of the material grain size. To clarify the strain distribution around the sheared edge, the elastic strain in a sheet sample with the thickness of 0.30 mm and grain size of 10 μm was evaluated by using synchrotron radiation. The width of the region of elastic strain due to shearing was two or three times of the material thickness. The results of the plastic strain distribution obtained by the measurements were then used to estimate the iron loss deterioration rate in 5 mm width sheared samples. The estimated loss deteriotation coincided with the actual measured iron loss.

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“…7 It is well established that processing of nonoriented electrical steels causes structural changes at the cutting edge, which finally affect the magnetic properties. 8,9 During mechanical cutting, plastic deformation appears in the zone near the cutting edge. [10][11][12] On the contrary, laser cutting induces thermal stress due to temperature gradients within the material during processing, which finally also results in deterioration of the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Laser remote cutting and surface treatment in manufacturing electrical machines—High productivity, flexibility, and perfect magnetic performance

Baumann

Siebert

Herwig

et al. 2015

Journal of Laser Applications

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From industrial electrical machine production, it is well known that processing of nonoriented electrical steels causes changes in the lattice and microstructure that also affect the magnetic structure. While applying these manufacturing techniques (punching or laser fusion cutting), mechanical and thermal stresses are induced due to elastic and plastic deformation or temperature gradients within the material. For more than 15 years, fusion cutting with CO2-lasers enabled a flexible and wear-free production but mostly for prototypes and small batches. Ten years ago, the development of diffraction limited solid-state lasers started and thus enabled laser remote cutting (LRC). Nowadays, industry demands sheet thicknesses between 0.35 and 0.5 mm due to the fact of eddy current loss reduction. Concerning this context, best choice is LRC. Within this work, latest results are presented in terms of resulting cutting speed, cutting edge quality, and magnetic properties. Cutting speed of LRC beats laser fusion cutting keeping the high rate of flexibility. The magnetic material properties of laser remote cut laminates are identical or even better to conventional punched parts. Therefore, the manufacturer has been given the possibility to tweak his process toward perfect magnetic behavior or high output volume. All in all, it will be possible to produce high efficient electrical machines regarding the application demands of the costumer.

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Aspects of the cut-edge effect stress on the power loss and flux density distribution in electrical steel sheets

Cited by 95 publications

References 3 publications

Operating point resolved loss computation in electrical machines

Operating point resolved loss computation in electrical machines

Evaluation of stress distribution due to shearing in non-oriented electrical steel by using synchrotron radiation

Laser remote cutting and surface treatment in manufacturing electrical machines—High productivity, flexibility, and perfect magnetic performance

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