Effect of Artificial Burrs on the Total Power Loss of a Three-Phase Transformer Core

Mazurek, Rafal; Marketos, P.; Moses, Anthony John; Vincent, Jean-Noël

doi:10.1109/tmag.2009.2032094

Cited by 26 publications

(15 citation statements)

References 5 publications

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“…there have been many studies, papers, and articles pertaining to this subject; the reader is advised to delve further into the literature for discussions on other aspects of machine performance variability. for instance, the effects of lamination manufacturing processes on lamination steel properties, and thus on machine performance, continue to be the subject of contemporary study, including recently by Mazurek et al [14], Lamprecht and graf [15], Liu et al [16], and arshad et al [17], and a thorough examination of the causes of performance variability from one machine to the next was presented by nailen [18].…”

Section: Potential Variation In Machine Performancementioning

confidence: 99%

Examining Magnetic Property Variation: A Look at Specification-Acceptable Electrical Steel

Sprague

2014

IEEE Ind. Appl. Mag.

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Section: Potential Variation In Machine Performancementioning

confidence: 99%

Examining Magnetic Property Variation: A Look at Specification-Acceptable Electrical Steel

Sprague

2014

IEEE Ind. Appl. Mag.

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“…The effect of punching on magnetic properties is studied in [14] and [15] where the increment of hysteresis loss is up to 20-40% compared to guillotine cut and in [16] magneto-mechanical coupled FEM was proposed to model the effect. There are also few studies done regarding the modeling of inter-laminar short circuit losses using artificial burr contacts in [7], [17], [18], [19] and [20] where effect on permeability due to punching is assumed constant and randomness of burr contacts is not completely addressed. In [7] the experimental studies were done to measure the losses due to burr contacts.…”

Section: Effects Of Burrs On Laminated Sheetsmentioning

confidence: 99%

Modeling of Losses Due to Inter-Laminar Short-Circuit Currents in Lamination Stacks

Shah

Rasilo

Belahcen

et al. 2013

Electrical, Control and Communication Engineering

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-The cores of electrical machines are generally punched and laminated to reduce the eddy current losses. These manufacturing processes such as punching and cutting deform the electrical sheets and deteriorate its magnetic properties. Burrs are formed due to plastic deformation of electrical sheets. Burr formed due to punching on the edges of laminated sheets impairs the insulation of adjacent sheet and make random galvanic contacts during the pressing of stacked sheets. The effect of circulating current occurs if the burrs occur on the opposite edges of the stacks of laminated sheets and incase of bolted or wielded sheets, induced current return through it. This induced current causes the additional losses in electrical machine. The existence of surface current on the boundary between two insulated regions causes discontinuity of tangential component of magnetic field. Hence, based on this principle, the boundary layer model was developed to study the additional losses due to galvanic contacts formed by burred edges. The boundary layer model was then coupled with 2-D finite element vector potential formulation and compared with fine mesh layer model. Fine mesh layer model consists of finely space discretized 950028 second order triangular elements. The losses were computed from two models and were obtained similar at 50 Hz. The developed boundary layer model can be further used in electrical machines to study additional losses due to galvanic contacts at the edges of stator cores.

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“…The effect of the burrs on these steels due to punching is studied in (Baudouin, et al, 2003), (Roger, et al, 2009). It has been observed that there is significant heating in the vicinity of the burred region of laminated steels (Mazurek, et al, 2010). Similarly, a few percent of increment in iron losses was observed in (Moses & Aimoniotis, 1989).…”

Section: Introductionmentioning

confidence: 99%

Estimation of additional losses due to random contacts at the edges of stator of an electrical machine

Shah

Rasilo

Belahcen

et al. 2015

COMPEL

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Abstract-The burrs of electrical machine formed during punching process impair the insulation and make random galvanic contacts between the electrical sheets. This paper presents the modeling of random galvanic contacts in a 37 kW induction machine using a surface boundary layer model. Several thousand time stepping finite element simulations were performed, varying the conductivity randomly at the edges of electrical sheets. Then, the additional losses were computed using a vector potential formulation and the surface boundary layer model. The preliminary result showed the increase of total electromagnetic loss by 7.7%

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Effect of Artificial Burrs on the Total Power Loss of a Three-Phase Transformer Core

Cited by 26 publications

References 5 publications

Examining Magnetic Property Variation: A Look at Specification-Acceptable Electrical Steel

Examining Magnetic Property Variation: A Look at Specification-Acceptable Electrical Steel

Modeling of Losses Due to Inter-Laminar Short-Circuit Currents in Lamination Stacks

Estimation of additional losses due to random contacts at the edges of stator of an electrical machine

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