Design of superconducting MHD saddle magnets

Drago, Gian Paolo; Molfino, P.; Repetto, Maurizio; Secondo, G; Lia, G.M.A.; Montanari, I.; Ribani, P.L.

doi:10.1109/20.119908

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…A Japanese group under Nakata [24], also as early as 1991 and not referencing the French works but the later work of Schafer-Jotter and Muller [20], optimized a magnetic circuit by minimizing a leastsquare object function by Rosenbrock's search method [5]. An early Italian paper from Jan. 1992 [25] had very powerful results in 3-D but offered little information in terms of method or the object function except to say they used pattern search with constraints. If they had given more details it would have been seminal for having branched into optimization in 3-D magnetics.…”

Section: Other Early Papers On Optimization In Magneticsmentioning

confidence: 99%

“…As a geometry changes and an element violates the Delaunay criterion for meshes [14], the nodal connections are changed by the mesh generator thereby making the evaluated object function undergo a C 1 discontinuity. The local minima encountered by researchers (according to numerous personal communications at the time such as with the authors of [25]) were thought to be systemic (i.e., inherent to the problem being solved) and bypassed by restarting the iterations from another point.…”

Section: Other Early Papers On Optimization In Magneticsmentioning

confidence: 99%

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Finite elements, design optimization, and nondestructive evaluation: A review in magnetics, and future directions in GPU-based, element-by-element coupled optimization and NDE

Jayakumar¹,

Thyagarajan²,

Rahunanthan

et al. 2015

International Journal of Applied Electromagnetics and Mechanics

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Most important journal papers in magnetics are selected from conference records with quick review and subject to stringent page limits. The literature as a result is unsatisfactory, inadequately attributing previous works and without sufficient details to replicate work presented. This paper therefore reviews mathematical optimization in synthesis and nondestructive evaluation (NDE) by the finite element method in magnetics. The review identifies the earliest papers. Thereafter this paper proposes and establishes the feasibility of coupled problem optimization using the genetic algorithm to avoid mesh induced minima which hurt gradient based methods. The genetic algorithm, while avoiding the need for derivatives, results in having to undertake even more numerous finite element solutions. Although the genetic algorithm has been applied in optimization, in coupled systems the number of object function evaluations doubles. We there examine the use of graphics processing units (GPUs) to handle the immense computational load. GPUs have recently been introduced in finite element analysis but their memory limits are often not recognized and are critically limiting when parallelizing the several solutions required in optimization. To overcome this limit, element-by-element finite element matrix processing is employed, making coupled problems practicable on GPUs. We overcome the memory limits faced by others.

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Section: Other Early Papers On Optimization In Magneticsmentioning

confidence: 99%

Section: Other Early Papers On Optimization In Magneticsmentioning

confidence: 99%

Finite elements, design optimization, and nondestructive evaluation: A review in magnetics, and future directions in GPU-based, element-by-element coupled optimization and NDE

Jayakumar¹,

Thyagarajan²,

Rahunanthan

et al. 2015

International Journal of Applied Electromagnetics and Mechanics

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“…The general form of equation solved in the scalar model by FEM in magneto-static application is given by (4). (4) where μ r and μ o are the tensor of the relative permeability of the medium and the permeability of a vacuum, respectively.…”

Section: (B)mentioning

confidence: 99%

“…This led to a new coil design that has improved the copper cross section area for switched reluctance machines. Superconducting coils with an inhomogeneous current density distribution yield more field for less volume of superconductor as described in [3,4]. The inhomogeneous current field, which is produced by a set of concentric sub coils, shows a linear decrease with the radius of each sub coil.…”

Section: Introductionmentioning

confidence: 99%

Influence of Concentric Saddle Shaped Coils on the Behavior of a Permanent Magnet Transverse Flux Machine with Segmented Construction

Baserrah¹,

Rixen²,

Orlik³

2012

Journal of Magnetics

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Flux concentrated permanent magnet transverse flux machines, FCPM-TFMs, with segmented stators require multi-turn concentric saddle coils to replace the ring coils, which are normally utilized in conventional layeredphase TFM constructions. In this paper, we investigate the influence of the shape of saddle phase windings and their parameter variations on the output torque productivity. Non-meshed coils evaluated via a finite element method (FEM) to examine the effect of the coil's location within one phase on machine performance. By using meshed coils, the analysis can be extended to inspect the distributions of magnetic field strength as well as current density in the coils. Throughout the study, the influence of design parameters on the output torque for two stator structures, i.e., a laminated and soft magnetic composite (SMC), are evaluated.

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