Magnetic Core Model of a Midfrequency Resistance Spot Welding Transformer

Podlogar, Vojko; Klopcic, Beno; Štumberger, Gorazd; Dolinar, Drago

doi:10.1109/tmag.2009.2031979

Cited by 17 publications

(14 citation statements)

References 11 publications

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“…The copper windings and integrated output diodes D 1 and D 2 contribute to the major parts of the losses. The iron core losses are at least 20 times lower [9] and are not considered in this case. The operating frequency of the analyzed RSW system is 1 kHz, U DC = 540 V and the duty ratio is set at 0.5.…”

Section: Presentation Of the Rsw Systemmentioning

confidence: 99%

Optimization of Resistance Spot Welding Transformer Windings Using Analytical Successive Approximation and Differential Evolution

et al. 2014

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A welding transformer represents a vital part of a resistance spot welding (RSW) system. Therefore, it is essential to ensure minimum copper loss in the windings. This paper describes a single-objective optimization procedure, which includes searching for the minimum copper loss in RSW transformer windings in regard to the dimensions of the primary and secondary windings. Copper loss in windings is obtained using an improved analytical method of successive approximation, which enables the calculation of current density distribution in coils with rectangular conductors. Finally, the calculated optimum windings' dimensions are further used in a parametric numerical model with the finite element method to confirm the reduction of copper loss.

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Section: Presentation Of the Rsw Systemmentioning

confidence: 99%

Optimization of Resistance Spot Welding Transformer Windings Using Analytical Successive Approximation and Differential Evolution

et al. 2014

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“…RSW systems consist of an input rectifier, dc circuit, H-bridge inverter, welding transformer, output rectifier, and welding electrodes [1]- [6]. The H-bridge inverter supplies the transformer's primary winding, wound around the iron core.…”

Section: Dynamic Model Of An Rsw Transformermentioning

confidence: 99%

“…The voltage drop in the primary winding resistance during the no-load operation is very small and is neglected [6]. From the measured primary voltage and the current and known geometry of the iron core, the average magnetic flux density B imeas and average magnetic field strength H imeas are calculated.…”

Section: A Determining the Parameters Of The J-a Modelmentioning

confidence: 99%

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Determining the Parameters of a Resistance Spot Welding Transformer Using Differential Evolution

et al. 2014

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This paper deals with determining the parameters of a resistance spot welding (RSW) transformer dynamic model. To obtain an efficient, accurate, and reliable dynamic model of an electromagnetic device, accurate determination of its model's parameters is crucial. In regard to an RSW transformer, determining of the dynamic model's parameters presents a big challenge. This paper presents a new methodology for determining such parameters, which can be used where other methods are not applicable or they give inaccurate results. It is based on a stochastic optimization algorithm called differential evolution (DE). Using the presented dynamic model of the device, the parameters of the model are determined by DE in such a way that the deviation between the measured and the calculated values is minimal.

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“…the Preisach model or the modified JA approach (Dlala et al, 2008). Finally, for the same purpose as the one considered in the presented paper, Podlogar et al (2010) applied a simple scalar model advanced by Tellinen (1998). When modelling the dynamic effects the authors used an approach similar in spirit to the flux tube description .…”

Section: Hysteresis Curves Of a Rswtmentioning

confidence: 99%

Hysteresis curves of a resistance spot welding transformer

Petrun

Chwastek

Dolinar

2013

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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PurposeThe aim of the paper is to provide a simple and reliable hysteresis model for prediction of magnetization curves of a resistance spot welding transformer (RSWT) core, operating in a wide range of flux densities and excitation frequencies.Design/methodology/approachThe hysteresis model considered in the paper is the T(x) description advanced by J. Takács. Three options to extend the model to the dynamic magnetization conditions are considered. The excitation conditions differ from those prescribed by international standards.FindingsThe quasi‐static Takács model combined with a fractional viscosity equation similar to that proposed by S.E. Zirka outperforms other considered options. The effect of eddy currents may be considered as a disturbance factor to the frequency‐independent quasi‐static hysteresis loop.Research limitations/implicationsThe combined approach yields in most cases a satisfactory agreement between theory and experiment. For highest frequency considered in the paper (1 kHz) excessive “heels” were observed in the modelled loops. This artifact may be reduced by the introduction of a more complicated relationship for the viscous term. Future work shall be devoted to this issue.Practical implicationsThe combined Takács‐Zirka model is a useful tool for prediction of magnetization curves of a RSWT core in a wide range of flux densities and excitation frequencies.Originality/valueThe usefulness of the Takács description has been verified in a practical application. The model is able to predict magnetization curves under non‐standard excitation conditions.

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Magnetic Core Model of a Midfrequency Resistance Spot Welding Transformer

Cited by 17 publications

References 11 publications

Optimization of Resistance Spot Welding Transformer Windings Using Analytical Successive Approximation and Differential Evolution

Optimization of Resistance Spot Welding Transformer Windings Using Analytical Successive Approximation and Differential Evolution

Determining the Parameters of a Resistance Spot Welding Transformer Using Differential Evolution

Hysteresis curves of a resistance spot welding transformer

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