Looking for magnetic parts? Low Permeability Nanocrystalline Cores Nanophy. Material on design Permeability on demand

Transcription

1 Looking for magnetic parts? kµ cores Low Permeability Nanocrystalline Cores Nanophy Stainless & Nickel Alloys Components Material on design Permeability on demand Permeability range from 2 to 3

2 Material Properties Material µ 5 Hz Thickness (µm) Density (g/cm³) Crystallization temperature ( C) Curie temperature ( C) Bs (T) maximum Br (mt) Hc (A/m) Maximum temperature ( C) Magnetostriction λs (ppm) Electrical resistivity (µω.m) Powders Ribbons s MPP Iron based kµ Iron based Fe 76 (Si,B) 24 Mn Zn <2MHz Ni ZN from 2 khz to 2 MHz / bulk bulk bulk < / 12 1 / < 1 <.2 27 > -1 > < 2 x 1 7 < 1 x 1 1 Typical Applications Low frequencies Component Typical µ Applications Alternative materials Current transformer with double level Current transformer with DC component 2 Broadband current sensor 17 Energy meter (5-6 Hz) FeNi 8% Advantages of kµ cores compared to alternative materials 1 MHz < Fc < 1 MHz µ (T ) and µ (H DC ) stability High B (+3%) with B-H linearity µ (H DC ) stability Differential Mode Choke 2<µ<6 EMC filter for unbalanced network MPP 1 MHz < Fc < 1 MHz Medium frequencies Smoothing inductance Storage inductance 2<µ<1 SMPS output filter transformer for high power density f<5 khz PFC inductance 2 RFI suppression filter Saturable inductance 3 Spike killer with unidirectional magnetization switching SMPS output voltage regulation 5 < f < 2 khz 3 SMPS output filter E and ETD MPP Iron based, no air gap µ (T ) and µ (H DC ) stability High ratio Bs²/µ High B µ (T ) stability No noise (λs ~ ) High B dyn Lowpass filter inductance CMC 2<µ<3 Telecommunications (ISDN, modem xdsl) 2 khz < f < 1 MHz B-H linearity High frequencies PLC coupler 1 Resonant inductance 2<µ<1 Telecommunications 2 < f < 1 MHz SMPS f < 1 MHz NiZn Dynamic µ (freq.) stability µ (T ) and µ (H DC ) stability No air gap Abbreviations: CMC = Common Mode Choke SMPS = Switch Mode Power Supply RFI = Radio Frequency Interference EMC = ElectroMagnetic Compatibility PFC = Power Factor Correction PLC = Power Line Carrier

3 B-H linearity B(T) 1.2 µ kµ 6 kµ 3 MPP µ 5 MPP µ 2 Miniaturization is favoured by the strong B-H linearity until saturation H (A/m) Permeability vs Frequency µ/µi MPP µ 125 kµ 6 µ 9 The excellent stability of permeability against frequency is better than MPP cores and similar to s. kµ cores offer a high cut frequency from 1 MHz to 15 MHz.2 MPP µ 55 MPP µ 2 kµ 3 µ f (MHz) Permeability under DC bias µ/µ(hdc=) MPP µ 55 kµ 3 µ 2 µ 9 MPP µ 3 µ 17 kµ 6 MPP µ 2 MPP µ Hdc (A/m) Under a DC bias field the high stability of permeability in a wide induction range gives a real advantage for energy storage and Watt hour metering

4 Magnetic Losses 1 Magnetic losses (mw/cm 3 ) MPP µ2 3 khz 1 khz 286 khz 122 khz 25 khz 25 khz Losses comparison at 1 khz &,2T: for µ = 3 => 7 times less than MPP losses for µ = 6 => 4 times less than MPP losses for µ = 17 => half the losses of => identical to s 1 B (T) Magnetic Losses and Design Performance factor (T.Hz) at 5 mw/cm 3 magnetic losses µ 2 The performance factor (Bmax x f) is a measure of the power density at a certain losses level. For a frequency <5 khz kµ cores are superior to s, and thus offer better miniaturization. Moreover, the lack of air gap improves the magnetic coupling, and thus the converter efficiency f (khz) Magnetic Losses vs Temperature 1. Magnetic losses (mw/cm 3 ) at 5 khz and.1t µ 2 Unlike s which are adjusted for a specific temperature, kµ cores offer stability of losses across a wide temperature range T ( C)

5 kµ Core Ordering Specifications Example: K X 1 7 Y 2 K = low permeability core X= bandwidth outer Ø inner Ø µ from 2 to 3 B = Box PA6-6 3FV E = Epoxy coating OD ID E F G H J O T HT Standard kµ cores list Reference Al * nominal (nh/sp²) Initial µ ** KE 1 7 B KE 1 7 B KE 1 7 B KE 1 7 B KE 1 7 B KF 16 1 B KF 16 1 B KF 16 1 B KF 16 1 B KF 16 1 B KG B KG B KG B KG B KG B KH 2 12 B KH 2 12 B KH 2 12 B KH 2 12 B KH 2 12 B KJ 3 2 Y KJ 3 2 Y KJ 3 2 Y KJ 3 2 Y KJ 3 2 Y KO 4 25 Y KO 4 25 Y KO 4 25 Y KO 4 25 Y KO 4 25 Y KT 5 3 E KT 5 3 E KT 5 3 E KT 5 3 E KT 5 3 E OD ID HT Bare core Epoxy Box Lm (cm) Ac (cm²) mass (g) OD x IDx HT *** OD x IDx HT *** x 5.8 x x 8.7 x x 15.6 x x 1.8 x x 18.5 x x 17.9 x x 23 x17 43 x 22.7 x x 28 x 22 - Ac = effective cross-section area Lm = mean magnetic path length * Al = nominal inductance (nh/t²) with typical tolerance ± 5 % (guaranty ± 15%) ** Initial permeability at 1 ma/cm and 1 khz *** OD = maximum outer diameter, ID = minimum internal diameter, HT = maximum height

6 Wide Low Permeability Range, Low Losses, no Air Gap needed Present on the nanocrystalline cores market since 1997, Arcelor Mittal Stainless and Nickel Alloys Components is proud to launch kµ, a new wide range of low permeability toroidal cores. Based on a dedicated patent, the Amilly site manages every step of the kµ manufacturing process, from annealing to core finishing. Now it s possible, without compromise to reduce volume and limit losses even for high frequencies applications. With no need for air gap, kµ cores offer all the advantages of nanocrystalline material. Energy storage 1 kµ cores the way to store energy without an air gap LI² (mh.a²) kµ 3 kµ IDC value given for 1.2T operating point KE KF KH KI kµ references KO ArcelorMittal - Stainless & Nickel Alloys Components 315 rue du Maréchal Juin - ZI 452 AMILLY - FRANCE tél: +33 () fax: +33 () contact-mecagis@arcelormittal.com size on request miniaturization with 3 mm bandwidth specific µ from 2 to 3 on request from prototypes to high volume cased or epoxy (or fixing) coated BrochureUKkµV1 Customized kµ cores