Optimization Of Coil Shapes Research Articles

Tailoring Coil Geometry for Achieving Uniform Heating Through Coil Shape Optimization for Induction Heating-Based Metal Wire Additive Manufacturing

Tailoring Coil Geometry for Achieving Uniform Heating Through Coil Shape Optimization for Induction Heating-Based Metal Wire Additive Manufacturing

Coil shape optimization of the electromagnetic flowmeter for different flow profiles

The precision of the electromagnetic flowmeter (EMF) suffers from the impact of the flow profiles. The typical idea is to construct an ideal magnetic field, in order to make the sensitivity of measurement area to be a constant. In the case of the ideal magnetic field, the potential difference between the two picking-up electrodes is linearly related to the mean velocity of the flow in the pipe, i.e. the flow rate. The necessary and sufficient conditions for the ideal magnetic field in the electromagnetic flowmeters were established in the paper. The EMF with ideal magnetic field is immune to the impact of the profiles. However, in the case of typical electrode configurations, e.g. point electrodes, the ideal magnetic field does not exist. As the alternative to the ideal magnetic field, the excitation coils were optimized to minimize the non-uniform of the sensitivity distribution in the measurement area. Numerical simulations were used to optimize the excitation coils in three dimensional cases. Two parameters of the excitation coils were optimized. Phantoms of the EMF with optimized excitation coils were constructed. Experimental results validated the performance the optimized excitation coils. Compared with the EMFs with commercially available coils, the EMF with optimum excitation coils was less sensitive to the flow profiles, especially in the cases of flows nearby a U-shaped pipe.

Coil Shape Optimization for Superconducting Wind Turbine Generator Using Response Surface Methodology and Particle Swarm Optimization

Changing the cross-sectional shape of superconducting field coils can reduce the total harmonic distortion (THD) of the air gap magnetic flux density (AGMFD) for superconducting wind turbine generators (SWTG). This paper proposes an approach to optimize the cross-sectional shape of the superconducting field windings for SWTG to minimize the THD of the AGMFD. This approach is based on the response surface methodology (RSM) and the particle swarm optimization (PSO). The RSM is used to construct the objective function and the PSO is used to calculate the optimal value of objective function swiftly. The optimized results would be compared with the initial results and thus prove the validity and accuracy of this approach.

A Study on the Effective Long Type Coil Shape by Multidisciplinary Method in Induction Heating

The axis symmetric analysis method can neither handle initial curved plates nor be used in the optimization of coil shapes because an axis symmetric coil is the only shape to analyze in this method. But the method using some discrete divisions and steps, can overcome these difficulties and show more accurate, reasonable results of temperatures and deflections in flat or curved plates with initial curvature, than those in the axis symmetric analysis method. Traditionally, the coil shape in induction heating is circular shape and it needs the moving process along heating lines. To overcome these, the “long type coil” with some linear parallel coils is proposed. It does not need the moving process along heating lines and reduces the heating process time. The results of experiments are compared with those of simulation.

다분할 해석법에 의한 장형코일의 곡가공 연구

AbstractThe induction heating is more efficient for a plate bending bec ause of its easy operation and control of working parameters, compared with the heating by a gas torch. The existing axis symmetric analysis method could neither handle initial curved plates nor be used in the optimization of coil shapes because of its limit of an axis sym metric coil shape. But the proposed method using some discrete part models and analysis pr ocesses could overcome these difficulties and show more accurate results in temperatur es and deflections of flat or curved plates with initial curvature than those in the existing axis symmetric analysis method. This method is composed of the multi-disciplinary analy ses such as an electro magnetic analysis, a heat transfer analysis and a deformation analysis based on inherent strain approach per each step. Traditionally, the coil shape in the induction heating is circular shape and it needs the moving process along heating lines. To overcome this, the 'Long Type Coil' with some linear parallel coils was proposed. It did not need the moving process along heating lines and reduced the heating process tim e. The results of experiments were compared with those of the simulation.

Algorithms for real time magnetic field tracing and optimization

We describe algorithms for tracing vacuum magnetic field lines in complex geometries at interactive speeds (∼50,000 steps/s on a personal computer), and a post-processing perturbation method for optimization of magnetic surface properties. Algorithms include an efficient single evaluation predictor-corrector integrator, a rapidly converging, high precision evaluation of rotational transform, and a coil shape optimization algorithm. Results from a flexible multi-mesh interpolation based code BLINE are presented.

Superconducting hexapole/solenoid for SERSE

We review the design, fabrication, and test of the coldmass of the superconducting hexapole/solenoid for the source SERSE (superconducting electron cyclotron resonance source) built in a joint venture between INFN, Catania, and CEA/DRFMC, Grenoble. Following the magnetic field specifications we did the optimization of coil shape and positioning to keep the induction in the coil heads at the necessary minimum. The forces acting on the coil heads due to the combined hexapole/solenoid field nevertheless are of highly complex structure. Therefore special attention was given to the structural analysis including 3D coil head simulations. According to ACCEL’s experience with s.c. wigglers and wavelength shifters the 700 mm long racetrack coils were imbedded into a stainless steel structure being completed by a set of structural wedges and shrink rings. After assembling of the quench protection diodes the magnet has been cold tested in a temporary cryostat and after a reasonable number of quenches it achieved all levels of performance for the axial profiles and the hexapolar field specified by INFN. Subsequently the training was continued to the exceptional maximum field of 1.54 T at the position of the plasma chamber wall (radius 65 mm), which is 10% above specification. The completed coldmass has been integrated into its final cryostat and is being tested at CEA.

Consideration of Optimal Magnet Coil Design Using Nb-Ti Superconductor for 200 MWe Magnetohydrodynamic Generator

We report on the effect of the cross-sectional shape of a magnet coil upon the reduction of the magnetohydrodymanic (MHD) channel length. We have optimized a cross-sectional shape of a magnet coil, including an MHD channel, for a 200 MWe coal-fired Faraday-type MHD generator. It is shown that the channel length can be shortened by more than 30% and the stored energy of the magnet coil can be reduced in comparison with the case of the crescent-shaped coil producing a uniform magnetic field without the decrease of enthalpy extraction. Also, for a stand-alone commercial MHD/steam combined plant, it is estimated by this coil shape optimization that the capital cost can be decreased by more than 8% and the cost of electricity can be reduced by about 3%.

Configuration optimization for a coupled 200‐MWe MHD channel and magnet coil system

AbstractThis paper reports on the results of the optimization of the cross‐sectional shape of a magnet coil system including an MHD channel. This optimization was carried out for a 200‐MWe supersonic Faraday‐type MHD generator. It was shown that the channel length can be shortened more than 30 percent, without the decrease of the enthalpy extraction by the optimization of the coil shape from the crescent shape coil producing a uniform magnetic field. It was estimated also that the capital cost for a commercial MHD/steam combined plant can be decreased more than 6 percent by this coil shape optimization.

磁気シールド機能を有する渦形傾斜磁場コイルの形状最適化計算

磁気シールド機能を有する渦形傾斜磁場コイルの形状最適化計算

Consideration of Optimal Magnet Coil Design for 1300 MWth Coal Combustion Magnetohydrodynamic Generator

In this paper, we discuss the effect of the cross-sectional shape of a magnet coil upon the reduction of the magnetohydrodynamic (MHD) channel length. Employing a coal-combustion plasma with semiperfect gaseous characteristics, the generator output performance of various magnet coil shapes are evaluated based on the 1-D gasdynamic model. The shape of a magnet coil cross section is optimized for a 1300 MWth supersonic Faraday-type MHD generator with a square inlet cross section. It is shown that the channel length can be shortened by 33% through optimization of the coil shape, in comparison with the case of the crescent-shaped coil producing a uniform magnetic field where the enthalpy extraction is effectively kept unchanged. Also, it is estimated that the capital cost for a stand-alone commercial MHD/steam combined plant can be decreased by more than 6% by means of this coil shape optimization.

仮想印加磁束密度法によるコイル形状最適化計算とそのMRI用Z傾斜磁界コイルへの適用

仮想印加磁束密度法によるコイル形状最適化計算とそのMRI用Z傾斜磁界コイルへの適用

200MWe級のMHD発電チャネル・励磁コイル形状の最適化

This paper reports on the results of the optimization of the cross-sectional shape of a magnet coil system including an MHD channel. This optimization was carried out for a 200-MWe supersonic Faraday-type MHD generator. It was shown that the channel length can be shortened more than 30 percent, without the decrease of the enthalpy extraction by the optimization of the coil shape from the crescent shape coil producing a uniform magnetic field. It was estimated also that the capital cost for a commercial MHD/steam combined plant can be decreased more than 6 percent by this coil shape optimization.