Magnetization dynamics of FeCuNbSiB soft magnetic ribbons and derived powder cores

Füzer, J.; Dobák, Samuel; Kollář, P.

doi:10.1016/j.jallcom.2014.12.126

Cited by 34 publications

(9 citation statements)

References 35 publications

(47 reference statements)

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“…Real and imaginary parts of the complex permeability were calculated from the measured inductance and serial resistance of the measuring circuit and parameters of the sample and toroidal coil [6,7]. Table I summarizes the parameters and properties of the prepared samples, volume fractions of the constituents and pores, outer diameter D, inner diameter d, height h, mass m, specific resistivity ρ, the coercivity H c , hysteresis lossesW DC at maximum induction 0.2 T and the demagnetization factor N d .…”

Section: Methodsmentioning

confidence: 99%

DC Magnetic Properties and Complex Permeability of Ni-Fe Based Composites

et al. 2017

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We have investigated soft magnetic composite materials to better understand the influence of binder (resin) content on the DC magnetic properties and the complex permeability. Soft magnetic composite samples were composed from NiFe powder with phenol formaldehyde resin (ATM). Ferromagnetic magnetic powder for ring-shaped samples was obtained by milling of small pieces cut of NiFe sheets. The obtained powder was annealed to partially remove structural defects. The prepared powder was mixed with phenol-formaldehyde resin in different vol.%. The mixtures were pressed into the ring-shape samples. Complex permeability and DC magnetic properties (initial magnetization curves, anhysteretic curves and hysteresis loops) were measured. Higher inner demagnetizing fields in the resin containing samples were responsible for higher coercivity and hysteresis losses, but the permeability was stable up to much higher frequencies, compared to the sample without the resin.

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Section: Methodsmentioning

confidence: 99%

DC Magnetic Properties and Complex Permeability of Ni-Fe Based Composites

et al. 2017

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“…On the contrary, H i in one strand originates from its neighboring strands. The internal H i can be approximated by (11) [21]:…”

Section: E Power Loss Calculationmentioning

confidence: 99%

“…Nanocrystalline materials, such as FeCuNbSiB, present several advantages that makes them attractive for IPT applications [10]. First, compared to ferrite, nanocrystalline ribbons are mechanically more robust and can be formed into various geometries.…”

Section: Introductionmentioning

confidence: 99%

“…This allows for a more robust, reliable, and flexible design. Second, it has a higher relative permeability µ r which reach values up to 300000 [11], which is several orders of magnitude higher than that of ferrite. Higher µ r constrains the magnetic flux more efficiently and reduces the flux leakage to shields or other metallic surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to nanocrystalline's higher Curie temperature than that of ferrite. The gradual decay of B sat as a function of the temperature ensures satisfactory performance in the middle temperature range [10], [12]. As a result, nanocrystalline cores can operate at higher temperatures without compromising performance.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility Study of Nanocrystalline-Ribbon Cores for Polarized Inductive Power Transfer Pads

Gaona

Ghosh

2020

IEEE Trans. Power Electron.

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MnZn-based ferrite materials like the EPCOS N87 or K2004 are commonly used as magnetic cores in inductive power transfer (IPT) applications. However, the performance and the reliability of IPT systems are limited by ferrite's intrinsic brittleness and low flux density saturation point. In this paper, a study of nanocrystalline ribbon based magnetic cores for IPT applications is presented. FEM simulations and experimental validations are used to compare both materials. The design of ultra-thin laminated cores such as nanocrystalline ribbons for IPT systems is presented. Compared to ferrite, nanocrystalline ribbon is mechanically more robust; it has a higher magnetic permeability and a higher saturation point. Results show that nanocrystalline ribbon cores achieve more than a 50% volume reduction when used in IPT pads. This is due to nanocrystalline's high saturation point. However, a compromise arises as the total power loss increases due to the induced eddy currents in the core. The reduction of efficiency can be mitigated by special geometrical designs of the nanocrystalline ribbon cores. A 6.6 kW IPT system has been built for experimental validation of the design methodology.

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