New Epstein Frame for Lamination Core Loss Measurements Under High Frequencies and High Flux Densities

Mthombeni, T.L.; Pillay, Pragasen; Strnat, R. M. W.

doi:10.1109/tec.2007.895875

Cited by 29 publications

(9 citation statements)

References 4 publications

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“…Conventional iron loss measurement techniques such as the Epstein-frame and the ring-core methods, require complex hardware and waveform control beyond a few kHz [17], [18]. Further, their neglect of complex field patterns and material deterioration due to manufacturing influences such as cutting, stacking and welding [19]- [22] limits the usefulness of such results.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

Millinger

Wallmark

Soulard

2018

IEEE Trans. on Ind. Applicat.

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PostprintThis is the accepted version of a paper published in IEEE transactions on industry applications. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. IEEE transactions on industry applicationsAccess to the published version may require subscription. N.B. When citing this work, cite the original published paper. © © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Abstract-The recent emerge of wide band-gap (WBG) power transistors enables higher switching frequencies in electrical motor drives. Their full utilization from a system point of view requires quantification of the corresponding time-harmonic motor losses. As an initial step, this paper presents a unique study of stator losses for three different commercially available non-oriented silicon-iron (SiFe) steel grades (with lamination thicknesses 0.1, 0.2 and 0.3 mm). The investigations cover a wide frequency range (10-100 kHz) at different levels of DC-bias (up to 1.6 T). Iron losses are identified from measurements on fully assembled stators, deploying a novel technique. By utilizing fully assembled stators, no additional samples are required. Manufacturing influence is inherently incorporated. Results show that measured iron losses are twice as high at 10 kHz compared to Epstein test results, which emphasizes the need to incorporate manufacturing influence on iron losses at high frequencies. The level of DC-bias is also observed to have a significant impact on iron losses (up to 30 %). Even though thinner laminations are known for reducing iron losses, the reduction is much lower than anticipated in the studied frequency range due to skin effect. Using 0.1 mm lamination gauge instead of 0.3 mm reduces losses by 50 % at 10 kHz, while the same substitution at 100 kHz only reduces losses by 30 %. Future work includes loss separation in complete converter-fed machines.

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Section: Introductionmentioning

confidence: 99%

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

Millinger

Wallmark

Soulard

2018

IEEE Trans. on Ind. Applicat.

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“…The benefits are the reduction of sample preparation time and increased drive capability. The frame has been tested up to 1 kHz in [1]. Further testing up to 6kHz has been done and reported in section IV.…”

Section: B 280-turn Epstein Framementioning

confidence: 99%

“…For example, the magnitude of 2T, 3.2 kHz has been of interest by the Electric Motor Education and Research Foundation Consortium (EMERF) of the Motor and Motion Association (SMMA) [1] [2]. The introduction of power electronics converters has made high speed applications a reality, thus reducing motor physical size and making them more favorable to applications with stringent size requirement.…”

Section: Introductionmentioning

confidence: 99%

“…The 700-turn frame drive capability is limited at 400Hz while the 352-turn is capable of reaching 4 kHz. A new 280-turn Epstein frame has been developed recently and presented in [1] with high frequency core loss measurement from various materials up to 1kHz. The measurements have been extended from 1 kHz to 6 kHz and are included in this paper.…”

Section: Introductionmentioning

confidence: 99%

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New Epstein Frame for Core Loss Measurements at High Frequencies and High Flux Densities

Manyage

Pillay

2008

2008 IEEE Industry Applications Society Annual Meeting

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This paper presents a new Epstein frame capable of core loss measurements on laminations subjected to high frequencies and high flux densities. The lamination characterization at high frequencies and high flux densities is mandatory in loss calculation procedure for high speed novel designs. The new 200-turn frame is compared with the 352-turn industrial standard frame and the recently developed 280-turn frame. The 200-turn frame core loss results show the ability of the frame to reach higher flux densities than the other two frames. The 280-turn frame core loss results have also been extended from 1 kHz to 6 kHz.

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“…The Orientation Density Functions (ODF) were calculated from the measured incomplete pole figures, (200), (110) and (211), by using the MTEX (V3.4.2) software [6]. Magnetic properties were measured by a 200-turn Epstein frame device specifically designed for small samples and at high frequencies [7]. Testing strips (10 mm 105 mm) were cut along the rolling direction and annealed, and the testing was carried out at 400 Hz.…”

Section: Introductionmentioning

confidence: 99%

Influence of the angle between cold rolling direction and hot rolling direction on the texture evolution of non-oriented electrical steels

Hilinski²,

Attard

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In processing non-oriented electrical steel sheets using conventional rolling schemes, the most common texture components obtained after final annealing are the magnetically unfavourable <111>//ND ( ) and <110>//RD ( ) fibres. A lot of researches have been carried out trying to optimize the processes to produce the favourable <001>//ND ( ) fibre. However, since the final texture is formed through a series of texture evolution steps during the solidification, hot rolling, cold rolling and annealing processes, it is quite challenging to tailor the texture of the final product. In this study, a new rolling scheme was examined, in which the cold rolling direction (CRD) was inclined to the hot rolling direction (HRD) at an angle from 0 to 90 (with a 15 increment). This was intended to alter the texture commonly produced by cold rolling along the HRD, and to optimize the final recrystallization texture. The cold rolling and recrystallization textures of two non-oriented electrical steels with 0.9% and 2.8% Si were measured. It was found that the inclination of CRD to HRD has a substantial effect on the cold rolling texture for both steels, but only in the low Si steel, does it lead to significantly different recrystallization textures. A strong cube texture was produced at an inclination angle of 60 , and the <111>//ND ( ) fibre was significantly weakened or essentially disappeared. The core losses of these steels were measured by Epstein frame method and the results showed a ~10% difference among strips cold rolled at different angles. A minimum core loss occurred at a 45 inclination angle in the low Si steel.

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New Epstein Frame for Lamination Core Loss Measurements Under High Frequencies and High Flux Densities

Cited by 29 publications

References 4 publications

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

New Epstein Frame for Core Loss Measurements at High Frequencies and High Flux Densities

Influence of the angle between cold rolling direction and hot rolling direction on the texture evolution of non-oriented electrical steels

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