Multiobjective Optimization Paradigm for Toroidal Inductors With Spatially Tuned Permeability

Abstract

Spatially tuning core permeability of an electromagnetic device enables superior performance. A permeability profile can be heuristically selected to improve the flux distribution in a device with a given geometry, but in order to fully leverage the capacity of spatial dependent permeability engineering, the geometry and the permeability should be optimized simultaneously. The work herein presented sets forth a multi-physics design optimization paradigm that includes the permeability profile tuning in the context of both inductor and converter design. This approach enables the determination of Pareto optimal fronts consisting of a set of optimal solutions against competing objectives (e.g. mass and loss) under imposed constraints. To this end, computationally efficient analytical solutions of the heat transfer and electromagnetic formulations are derived for toroidal inductors, which are validated with Finite Element Analysis based simulations. The software implemented in Matlab 2018b is available online as an attachment to this paper.

Toroidal Nanocrystalline Powder Core With Trapezoidal Cross Section

“…4(a)-(e) demonstrates a strong correspondence between the calculated value using (8) and the FEM value. On average, the deviation between the calculated results using (8) and the FEM values from Fig. 4(a) to (e) is 1.85%, 1.88%, 2.05%, 1.96%, and 1.93%, respectively.…”

“…In [6] and [7], tape-wound Co-based amorphous toroidal cores with spatially tuned permeability are obtained by monotonically adjusting the tension during the strain annealing process. The graded permeability across these proposed cores leads to a balanced flux distribution that lowers core losses and provides more uniform thermal profiles [8]. At present, however, major challenges still remain for such toroidal cores with spatially tuned permeability.…”

Study of a High-Power Medium Frequency Transformer Using Amorphous Magnetic Material

“…Based on magnetic coupling, the MFT can realize the galvanic insulation and voltage conversion between the high and low voltage sides. In addition, reducing the size and weight of electrical equipment and improving energy efficiency have also been major research goals in recent decades in the field of power transmission [6]. Compared with traditional power transformers, MFTs can greatly reduce their size and weight by increasing the operating frequency and using novel magnetic materials [7].…”