Electrical Steels for Rotating Machines

Beckley, P.

doi:10.1049/pbpo037e

Cited by 121 publications

(71 citation statements)

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“…The three silicon [9]. Defining the path length absolute value is a complex task [3] and it is not a goal in this paper. As already mentioned in [3], the effective path lengths ranges between 0.88 m and 1.06 m, mainly depending on the permeability of the steel.…”

Section: Measuring Systens and Samplesmentioning

confidence: 99%

“…The second one is the ring core test, but here, instead of rings, stacks of steel laminations are used. It allows testing the steel under a condition close to the induction motor stator operation [3]. The third one is the dynamometer test.…”

mentioning

confidence: 99%

“…Using steel lamination in the ring test allows to be close to the real motor behavior but makes the quantitative comparison quite hard. On the other hand, the Epstein frame test is the most used and accepted in the electric steel characterization because low complexity, high reproducibility and own specific standards [3] [4]. As is well known [3] [5], for several reasons, the Epstein test does not provide the iron losses in a machine with accuracy.…”

mentioning

confidence: 99%

“…On the other hand, the Epstein frame test is the most used and accepted in the electric steel characterization because low complexity, high reproducibility and own specific standards [3] [4]. As is well known [3] [5], for several reasons, the Epstein test does not provide the iron losses in a machine with accuracy. Indeed, both ring core tester and Epstein frame simulate different conditions compared to the actual motor, especially considering manufacturing phenomena (cutting, degradation of cutting even after the annealing, heat treatment no homogeneous, interlaminar losses etc.)…”

mentioning

confidence: 99%

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Testing strategies to evaluate non-oriented electrical steels losses

Schlegel

Batistela

Sadowski

et al. 2012

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-This paper presents an experimental comparative study of iron losses obtained by means of the Epstein frame, RingCore and dynamometer tests with non-oriented electrical steel samples. The comparisons are qualitative and they are intended to show the importance of carrying out other tests to evaluate electrical steels in addition to the standard Epstein frame method. In industry, complex or costly tests are avoided, whenever it is possible. This study shows that the ring core test can be a low cost solution since it is effective. For the manufacturer point of view, comparing different commercial steels at purchase time with a simple process is an advantage.Index Terms-Non-oriented electrical steel, iron losses, iron losses measurement, Epstein frame test, ring core test, dynamometer test. I. INTRODUCTIONThe growing demand for electricity, the need of investments, environment issues and lower costs production in the competitive market are factors that increase the concern of electric machine manufacturers with their products performance. One of major concerns related to the efficiency of devices is the losses in electric and magnetic components. Electrical steel sheets are widely used in electrical machine industry. The iron losses in the core and the magnetic permeability are relevant aspects in the design and optimization process and, therefore, for consumer acceptance in terms of electrical motor efficiency. Companies are investing in specialized departments to carry out tests to characterize or measure the electrical steel quality related to the appearance of new materials and the development of new production processes. Such departments play a relevant role as they supply valuable data for companies guiding price negotiations, parameters for future projects and quality control data of ferromagnetic materials. There are several types of ferromagnetic materials. In this work, we consider three semi-processed non-oriented silicon steels, having low iron losses and used in rotational electrical machines. The materials investigated come from three different commercial suppliers. In this context, this paper presents a comparison between three experimental approaches for evaluating three steel suppliers. The materials under consideration have equivalent characteristics (from commercial point of view, the same magnetic losses). This work is the evolution of a previous

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Section: Measuring Systens and Samplesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Testing strategies to evaluate non-oriented electrical steels losses

Schlegel

Batistela

Sadowski

et al. 2012

J. Microw. Optoelectron. Electromagn. Appl.

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“…Therefore, these sheets should have isotropic properties, and they are produced as nonoriented steel sheets. However, different magnetic measurements carried out by means of both the Epstein frame and the Rotational Single Sheet Tester have shown that dynamo sheets have certain anisotropic properties, both in terms of the magnetization curves and power losses [1,2]. The magnetic anisotropy occurring in the majority of dynamo steel sheets should be taken into numerical models of the magnetization processes, especially in analysis of the rotational magnetization.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic anisotropy on flux density changes in dynamo steel sheets

Mazgaj¹,

Szular²,

Warzecha³

2015

Archives of Electrical Engineering

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Magnetic measurements, carried out by means of the Epstein frame, have shown that most typical dynamo steel sheets have certain anisotropic properties. In numerical analysis, anisotropic properties are taken into account with the use of the special function of the grain distribution in the given dynamo sheet. For engineering purposes, it is desirable to assess the influence of these properties on the changes of the magnetic flux density in typical dynamo steel sheets, especially during the rotational magnetization. For this purpose, measurements of the flux density changes and field strength changes in the circular-shaped samples of two selected typical dynamo sheets were performed. These measurements were carried out for several values of the current flowing in windings which generated the axial or rotational magnetic field in the test dynamo sheet. The influence of the magnetic anisotropy on the magnetization process was briefly discussed for both types of the magnetization processes.

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Operation and Control

Klempner¹,

Kerszenbaum²

2008

Handbook of Large Turbo‐Generator Operation and Maintenance

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Electrical Steels for Rotating Machines

Cited by 121 publications

References 0 publications

Testing strategies to evaluate non-oriented electrical steels losses

Testing strategies to evaluate non-oriented electrical steels losses

Influence of magnetic anisotropy on flux density changes in dynamo steel sheets

Operation and Control

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